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  • The All New . . .TACO ZONE CONTROLS WIRING GUIDE

    Pages

    Switching Relays – Single Zone Wiring 2 – 4

    Switching Relays – Oil Boiler Wiring Safety Notice – 5

    Switching Relays – NON EXP Connected Together with Priority 6 – 9

    Switching Relays – EXP Connected Together with Priority 10 – 13

    Switching Relays – Multiple Indirect Hot Water Heaters 14 – 15

    Switching Relays – EXP Connected To Reset Controls (PC700, 702 & 705) 16 – 27

    Zone Valve Controls – NON EXP Connected Together with Priority 28 – 32

    Zone Valve Controls – EXP Connected Together with Priority 33 – 36

    Zone Valve Controls – Connected To Reset Controls (PC700, 702 & 705) 37 – 44

    Hydro Air Fan Controls (HAFC 201) 45 – 47

    New Expandable Zone Control – Connected to Older Expandable Zone Control 48 – 50

    Specialty Thermostat and Zone Valve Wiring 51 – 59

    Radiant Mixing Block 60 – 61

    X-Pump Block 62 – 64

    iSeries Mixing Valves 65 – 66

    Low Water Cutoffs and Electric Water Feeders 67 – 82

    Aquastat Wiring 83 – 89

    Instruction Sheets 90 – 102

    Standard Terms and Definitions – 103

    Zone Controls Cross Reference 104 – 105

    Do it once.Do it right.

    © Taco Catalog No. 100-92 Effective Date: November 27, 2014 Supersedes Date: September 20, 2013

  • TACO Zone Control Product Information

    Switching RelaysProduct No. DescriptionSR501-4 1 Zone Switching RelaySR501-HC-4 1 or 2 Zone Switching Relay, High Current CapacitySR501-OR-4 1 Zone Switching Relay with Outdoor ResetSR502-4 2 Zone Switching Relay with PrioritySR503-4 3 Zone Switching Relay with PrioritySR504-4 4 Zone Switching Relay with PrioritySR506-4 6 Zone Switching Relay with Priority

    Expandable Switching Relays – Expandable to 120 Zones (20 Zoning Panels)Product No. DescriptionSR501-EXP-4 1 Zone Switching RelaySR503-EXP-4 3 Zone Switching Relay with PrioritySR504-EXP-4 4 Zone Switching Relay with PrioritySR506-EXP-4 6 Zone Switching Relay with Priority

    Zone Valve ControlsProduct No. DescriptionZVC403-4 3 Zone Valve Control with PriorityZVC404-4 4 Zone Valve Control with PriorityZVC405-4 5 Zone Valve Control with PriorityZVC406-4 6 Zone Valve Control with Priority

    Expandable Zone Valve Controls – Expandable to 120 Zones (20 Zoning Panels)Product No. DescriptionZVC404-EXP-4 4 Zone Valve Control with Priority ZVC406-EXP-4 6 Zone Valve Control with Priority

    Add-On Power Controls (For use with all -EXP controls)Product No. DescriptionPC700 Boiler Reset ControlPC702 2-Stage Boiler Reset ControlPC705 Variable Speed Pump Injection Mixing Control

    Fan ControlsProduct No. DescriptionHAFC201-4 Hydro Air Fan Control with Optional Time Delays

    Do it once.Do it right.

  • 2

    SR50

    1-4

    Switc

    hing

    Rela

    y W

    iring

    TYP

    ICA

    L W

    IRIN

    G(C

    OLD

    STA

    RT)

    ON

    E ZO

    NE

    SWIT

    CH

    ING

    REL

    AY

    SR 5

    01-4

    FUSE

    6 AM

    P

    POW

    ER

    ZON

    E 1

    LED

    IND

    ICAT

    ORS

    FUSE

    6 AM

    P

    NH

    34

    45

    66

    N/O

    N/O

    N/C

    N/C

    CO

    MC

    OM

    120

    VAC

    INPU

    T

    TT

    CO

    M

    RW

    24 VAC

    TO: 1

    20 V

    AC P

    OW

    ER

    CIR

    CU

    LATO

    R

    JUMPE

    RTO

    : TT

    ON

    BO

    ILER

    THER

    MO

    STAT

    TO: 1

    20 V

    AC P

    OW

    ERC

    IRC

    ULA

    TOR

    TO: Z

    CTO

    : ZR

    ALT

    ERN

    ATI

    VE

    WIR

    ING

    (TA

    NK

    LESS

    CO

    IL)

    ON

    E ZO

    NE

    SWIT

    CH

    ING

    REL

    AY

    SR 5

    01-4

    FUSE

    6 AM

    P

    POW

    ER

    ZON

    E 1

    LED

    IND

    ICAT

    ORS

    FUSE

    6 AM

    P

    NH

    34

    45

    66

    N/O

    N/O

    N/C

    N/C

    CO

    MC

    OM

    120

    VAC

    INPU

    T

    TT

    CO

    M

    RW

    24 VACTH

    ERM

    OST

    AT

    TO: 1

    20 V

    AC P

    OW

    ER

    CIR

    CU

    LATO

    R

    TO: T

    T O

    N B

    OIL

    ER

    ALT

    ERN

    ATI

    VE

    WIR

    ING

    (24

    VA

    C P

    OW

    ERED

    INP

    UT

    SIG

    NA

    L)

    NH

    REM

    OVE

    JUM

    PER.

    DO

    NO

    T C

    ON

    NEC

    T PO

    WER

    TO N

    AN

    D H

    TER

    MIN

    ALS.

    * T

    STAT

    LIG

    HT

    WIL

    L G

    O

    ON

    AN

    D O

    FF W

    ITH

    24

    VAC

    SI

    GN

    AL. P

    OW

    ER L

    IGH

    T

    WIL

    L AL

    WAY

    S BE

    OFF

    .

    ON

    E ZO

    NE

    SWIT

    CH

    ING

    REL

    AY

    SR 5

    01-4

    FUSE

    6 AM

    P

    POW

    ER *

    ZON

    E 1

    *

    LED

    IND

    ICAT

    ORS

    FUSE

    6 AM

    P

    NH

    34

    45

    66

    N/O

    N/O

    N/C

    N/C

    CO

    MC

    OM

    120

    VAC

    INPU

    T

    TT

    CO

    M

    RW

    24 VAC

    24 V

    ACSI

    GN

    AL

    Not

    e:W

    hen

    usi

    ng

    Alt

    ern

    ativ

    e W

    irin

    g di

    agra

    m,

    the

    boile

    r op

    er-

    atin

    g co

    ntr

    ol’s

    ZC t

    erm

    inal

    will

    see

    th

    e lo

    ad o

    f th

    e ci

    rcul

    ator

    (s).

    W

    arn

    ing

    :W

    hen

    us

    ing

    Alt

    ern

    ativ

    e W

    irin

    g di

    agra

    m,

    wir

    ing

    inst

    ruct

    ion

    s m

    ust

    be fo

    llow

    ed s

    o po

    wer

    ori

    gin

    ates

    from

    th

    e bo

    iler

    aqua

    stat

    . Fai

    lure

    to

    follo

    w t

    hes

    e w

    irin

    g in

    stru

    ctio

    ns

    may

    res

    ult

    ina

    seco

    nda

    ry s

    ourc

    e of

    pow

    er b

    ein

    g co

    nn

    ecte

    d to

    th

    e bo

    iler

    that

    may

    act

    ivat

    e it

    unde

    r cer

    tain

    circ

    umst

    ance

    s, c

    ausi

    ng in

    jury

    or d

    eath

    .

  • 3

    AlternativeWiring

    ONE ZONE HCSWITCHING RELAY

    SR 501-HC-4

    LEDINDICATORS

    R W1

    24 VAC THERMOSTAT

    W2COM

    24VAC

    T T T

    N H X1RELAY 2RELAY 1

    120 VACINPUT

    120 VACCIRCULATOR

    X1X2 X2

    N

    ZR

    ZC

    HPOWER INPUT

    (120 VAC)

    POWER

    RELAY 1

    RELAY 2

    ONE ZONE HCSWITCHING RELAY

    SR 501-HC-4

    LEDINDICATORS

    R W1

    24 VAC THERMOSTAT

    W2COM

    24VAC

    T T T

    N H X1RELAY 2RELAY 1120 VACINPUT

    POWERINPUT

    (120 VAC)120 VAC

    CIRCULATOR

    X1X2 X2

    N

    H

    BOILERCONTROL

    POWER

    RELAY 1

    RELAY 2

    TypicalWiring

    SR501-HC-4 – One Zone Switching Relay with or without Boiler Enable

    ONE ZONE HCSWITCHING RELAY

    SR 501-HC-4

    LEDINDICATORS

    R W1

    24 VAC THERMOSTAT

    W2COM

    24VAC

    T T T

    N H X1RELAY 2RELAY 1120 VACINPUT

    240 VACCIRCULATOR

    X1X2 X2

    N

    H1

    H2

    ONE ZONE, NO BOILER ENABLE(CONTROL & CIRCULATOR SAME POWER SOURCE)

    CONTROL POWERINPUT (120 VAC)

    POWER

    RELAY 1

    RELAY 2

    (240 VAC)

    {{ONE ZONE HC

    SWITCHING RELAY

    SR 501-HC-4

    LEDINDICATORS

    R W1

    24 VAC THERMOSTAT

    W2COM

    24VAC

    T T T

    N H X1RELAY 2RELAY 1120 VACINPUT

    240 VACCIRCULATOR

    X1X2 X2

    N

    H1

    H2

    ONE ZONE, NO BOILER ENABLE(CONTROL & CIRCULATOR DIFFERENT POWER SOURCE)

    H

    POWER

    RELAY 1

    RELAY 2

    CONTROL POWERINPUT (120 VAC)

    (240 VAC)

    {

    {

    ONE ZONE HCSWITCHING RELAY

    SR 501-HC-4

    LEDINDICATORS

    R W1 W2COM

    24VAC

    T T T

    N H X1RELAY 2RELAY 1120 VACINPUT

    CIRCULATOR #1(120 VAC)

    X1X2 X2

    N

    TWO ZONE, NO BOILER ENABLE

    H

    CIRCULATOR #2(120 VAC)

    THERMOSTAT #2(24 VAC)

    THERMOSTAT #1(24 VAC)

    POWERINPUT

    (120 VAC)

    POWER

    RELAY 1

    RELAY 2

    NOTE: When using Alternative Wiring diagram, refer to important NOTEand WARNING in SR501-HC Instruction Sheet on page 91 of this booklet.

    RELAY RATING: 3⁄4 HP (13.8 FLA, 82.8 LRA at 120 VAC)(6.9 FLA, 41.4 LRA at 240 VAC)

  • SR501-OR-4 – One Zone Switching Relay with Outdoor Reset

    ONE ZONE INSTALLATIONW/O INDIRECT DHW

    ONE ZONESWITCHING RELAY

    WITH OUTDOOR RESET

    SR 5

    01-O

    R-4

    LEDINDICATORS

    POWER

    TSTAT

    DHWOVERRIDE

    BOILERRELAY

    N HINPUT

    120 VACZONE 1120 VAC

    N H

    6AMP

    X RBOILER TSTAT

    W C R WDHW

    OUTDOORSENSOR

    SUPPLYSENSOR

    XDESIGN OUTDOORTEMPERATUREFOR 180°F SUPPLY

    TEMPERATURE

    OFF

    -30

    -20

    0-10 1020

    40

    30

    ON

    SW1

    OFF

    SYSTEMCIRCULATORN

    H

    POWERINPUT

    (120 VAC)

    24 VACTHERMOSTAT

    BOILERCONTROL

    OUTDOORSENSOR

    BOILERSUPPLYSENSOR

    POT1

    ZONE VALVE INSTALLATIONW/O ZONE CONTROL, W/O INDIRECT DHW

    ONE ZONESWITCHING RELAY

    WITH OUTDOOR RESET

    SR 5

    01-O

    R-4

    LEDINDICATORS

    POWER

    TSTAT

    DHWOVERRIDE

    BOILERRELAY

    N HINPUT

    120 VACZONE 1120 VAC

    N H

    6AMP

    X RBOILER TSTAT

    W C R WDHW

    OUTDOORSENSOR

    SUPPLYSENSOR

    XDESIGN OUTDOORTEMPERATUREFOR 180°F SUPPLY

    TEMPERATURE

    OFF

    -30

    -20

    0-10 1020

    40

    30

    ON

    SW1

    OFF

    ZONE VALVECIRCULATORN

    H

    POWERINPUT

    (120 VAC)

    BOILERCONTROL

    OUTDOORSENSOR

    BOILERSUPPLYSENSOR

    POT1

    ZONE VALVEEND SWITCH(S)

    THERMOSTATS(24VAC)

    TRAN

    SFO

    RMER

    24 VAC120 VACINPUT

    MULTI-ZONE INSTALLATIONWITH ZONE CONTROL, W/O INDIRECT DHW

    ONE ZONESWITCHING RELAY

    WITH OUTDOOR RESET

    SR 5

    01-O

    R-4

    LEDINDICATORS

    POWER

    TSTAT

    DHWOVERRIDE

    BOILERRELAY

    N HINPUT

    120 VACZONE 1120 VAC

    N H

    6AMP

    X RBOILER TSTAT

    W C R WDHW

    OUTDOORSENSOR

    SUPPLYSENSOR

    XDESIGN OUTDOORTEMPERATUREFOR 180°F SUPPLY

    TEMPERATURE

    OFF

    -30

    -20

    0-10 1020

    40

    30

    ON

    SW1

    OFF

    ZONE VALVECIRCULATORN

    H

    POWERINPUT

    (120 VAC)

    BOILERCONTROL

    OUTDOORSENSOR

    BOILERSUPPLYSENSOR

    POT1

    1 2 3 4ZONE 1

    1 2 3 4ZONE 2

    1 2 3 4ZONE 3

    EXISTINGZONE VALVE CONTROL

    POW

    ER IN

    24 V

    AC

    N/O COM N/C

    PUMP ENDSWITCH

    FUSE

    5 AM

    P

    ZONE 3 PUMPEND SWITCH

    THERMOSTATS(24VAC)

    T STAT 1 VALVE 1

    T STAT 2 VALVE 2

    T STAT 3 VALVE 3

    POWER

    LEDINDICATORS

    ZONE 1 ZONE 2 ZONE 3ISOLATEDX X R W R W R W

    END SWITCH THERMOSTATS PRIORITY

    24 VAC ZONE VALVES PRIORITY

    X X

    ZONE 3PRIORITY

    OFF

    ONC C C

    2 WIRE ZONE VALVE(NO END SWITCH)MUST USE JUMPER

    TACO 3 WIREZONE VALVE

    123

    JUMPER3 & 4

    TACO 3 WIREZONE VALVE

    123

    MULTI-ZONE INSTALLATIONWITH ZONE CONTROL, WITH INDIRECT DHW

    ONE ZONESWITCHING RELAY

    WITH OUTDOOR RESET

    SR 5

    01-O

    R-4

    LEDINDICATORS

    POWER

    TSTAT

    DHWOVERRIDE

    BOILERRELAY

    N HINPUT

    120 VACZONE 1120 VAC

    N H

    6AMP

    X RBOILER TSTAT

    W C R WDHW

    OUTDOORSENSOR

    SUPPLYSENSOR

    XDESIGN OUTDOORTEMPERATUREFOR 180°F SUPPLY

    TEMPERATURE

    OFF

    -30

    -20

    0-10 1020

    40

    30

    ON

    SW1

    OFF

    ZONE VALVECIRCULATORN

    H

    POWERINPUT

    (120 VAC)

    BOILERCONTROL

    OUTDOORSENSOR

    BOILERSUPPLYSENSOR

    POT1

    1 2 3 4ZONE 1

    1 2 3 4ZONE 2

    1 2 3 4ZONE 3

    EXISTINGZONE VALVE CONTROL

    POW

    ER IN

    24 V

    AC

    N/O COM N/C

    PUMP ENDSWITCH

    FUSE

    5 AM

    P

    ZONE 3 PUMPEND SWITCH

    THERMOSTATS(24VAC)

    T STAT 1 VALVE 1

    T STAT 2 VALVE 2

    T STAT 3 VALVE 3

    POWER

    LEDINDICATORS

    ZONE 1 ZONE 2 ZONE 3ISOLATEDX X R W R W R W

    END SWITCH THERMOSTATS PRIORITY

    24 VAC ZONE VALVES PRIORITY

    X X

    ZONE 3PRIORITY

    OFF

    ONC C C

    2 WIRE ZONE VALVE(NO END SWITCH)MUST USE JUMPER

    TACO 3 WIREZONE VALVE

    123

    JUMPER3 & 4

    TACO 3 WIREZONE VALVE

    123

    DHWAQUASTATA

    4

  • 5

    NOTE: Tankless coil has priority.

    L1 L2 T T

    LINE VOLTAGEOIL BURNER RELAY

    CIRCULATORON BOILER

    (IF ATTACHED)

    B2

    C1

    B1ZR

    HONEYWELL L8124OR EQUAL

    120 VAC INPUT

    C2

    ZC

    L1 L2

    (NEUTRAL)(HOT)

    CIRCUITBREAKER

    CUSTOMEREMERGENCY

    SWITCH

    THERMALFUSE

    (FIROMATIC)

    SERVICESWITCH

    LOWWATERCUTOFF

    T

    FOUR ZONE SWITCHING RELAY

    120 VAC CIRCULATORSZC

    INPUT120 VAC

    ZONE 1 ZONE 2 ZONE 3 ZONE 4

    ZONE1 ZONE2 ZONE3

    THERMOSTATS

    SR 504-4

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    X X R W R W R W R WISOLATED

    ENDSWITCH THERMOSTATS (24 VAC)

    PRIORITY120 VACZR

    H H N H N H N H N H N HZONE4

    ZONE 2

    POWER

    ZONE 1

    ZONE 3

    ZONE 4

    LEDINDICATORS

    ZONE 4PRIORITY

    OFFON

    PRIORITY

    24 VAC

    COM

    THERMOSTATS

    T

  • 6

    Two Switching Relays Connected Together

    BOILER

    H

    N

    TT T

    TT T

    OUTPUTNOTUSED

    120 VAC INPUT

    FOUR ZONE SWITCHING RELAY

    120 VAC CIRCULATORSZC

    INPUT120 VAC

    ZONE 1 ZONE 2 ZONE 3 ZONE 4

    ZONE1 ZONE2 ZONE3

    THERMOSTATS

    SR 504-4

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    X X R W R W R W R WISOLATED

    ENDSWITCH THERMOSTATS (24 VAC)

    PRIORITY120 VACZR

    H H N H N H N H N H N HZONE4

    ZONE 2

    POWER

    ZONE 1

    ZONE 3

    ZONE 4

    LEDINDICATORS

    ZONE 4PRIORITY

    OFFON

    PRIORITY

    TO: "TT" ON BOILER

    JUMPER

    24 VAC

    COM

    DHWHEATER

    CIRCULATOR

    THERMOSTATS

    120 VAC INPUT

    FOUR ZONE SWITCHING RELAY

    120 VAC CIRCULATORSZC

    INPUT120 VAC

    ZONE 1 ZONE 2 ZONE 3 ZONE 4

    ZONE1 ZONE2 ZONE3

    SR 504-4

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    X X R W R W R W R WISOLATED

    ENDSWITCH THERMOSTATS (24 VAC)

    PRIORITY120 VACZR

    H H N H N H N H N H N HZONE4

    ZONE 2

    POWER

    ZONE 1

    ZONE 3

    ZONE 4

    LEDINDICATORS

    ZONE 4PRIORITY

    OFFON

    PRIORITY

    JUMPER

    24 VAC

    COM

    TO: "TT" ON BOILER

    INDIRECTWATER HEATERAQUASTAT ORTHERMOSTAT

  • 7

    Priority Zoning Circulator Controlling Switching Relay

    TO: "TT" ON BOILER

    120 VAC INPUT

    BOILER

    H

    N

    MASTER

    SLAVE

    PRIORITYON

    PRIORITYOFF

    120 VACINPUT

    SIX ZONE SWITCHING RELAY

    120 VAC CIRCULATORSZC

    INPUT120 VAC

    ZONE 1 ZONE 2

    ZONE 3 ZONE 4 ZONE 5 ZONE 6

    ZONE1 ZONE2 ZONE3 ZONE4 ZONE5

    THERMOSTATS

    SR 506-4

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    X X R W R W R W R W R W R WISOLATED

    ENDSWITCH THERMOSTATS (24 VAC)

    PRIORITY120 VACZR

    H H N H N H N H N H N H N H N HZONE6

    ZONE 2

    POWER

    ZONE 1

    ZONE 3

    ZONE 4

    ZONE 5

    ZONE 6

    LEDINDICATORS

    ZONE 6PRIORITY

    OFFON

    PRIORITY

    24 VAC

    COM

    REMOVEJUMPER

    PPR

    IORI

    TY

    24 VACOUTPUT

    (OPTIONAL)

    POW

    ER IN H

    (on)

    MASTER

    CIRC.ONPRIORITY

    MASTER/SLAVESWITCH

    R W X X R C

    THERMO-STAT

    ENDSWITCH

    24 VACPOWER

    N

    PRIORITY ZONINGCIRCULATOR

    INDIRECTWATER HEATERAQUASTAT ORTHERMOSTAT

  • 8

    Prior

    ity Z

    onin

    g Ci

    rcul

    ator

    Con

    trolli

    ng 2

    Swi

    tchi

    ng R

    elays

    IND

    IREC

    TW

    ATER

    HEA

    TER

    AQU

    ASTA

    T O

    RTH

    ERM

    OST

    AT

    120

    VAC

    INPU

    T

    TO:

    "TT"

    ON

    BO

    ILER

    H N

    SLA

    VE

    120

    VAC

    INPU

    T

    REM

    OVE

    JUM

    PER

    MA

    STE

    R

    PRIO

    RITY

    ON

    PPRIORITYPOWER IN

    H

    (on)

    MAS

    TER

    CIR

    C.

    ON

    PRIO

    RITY

    MAS

    TER/

    SLAV

    ESW

    ITC

    H

    RW

    XX

    RC

    THER

    MO

    -ST

    ATEN

    DSW

    ITC

    H24

    VAC

    POW

    ER

    N

    PRIO

    RITY

    ZO

    NIN

    GC

    IRC

    ULA

    TOR

    TT

    T

    120

    VAC

    INPU

    T

    FOU

    R ZO

    NE

    SWIT

    CH

    ING

    REL

    AY

    120

    VAC

    CIR

    CU

    LATO

    RSZC

    IN

    PUT

    120

    VAC

    ZO

    NE

    1 ZO

    NE

    2 ZO

    NE

    3 ZO

    NE

    4

    Z

    ON

    E1 Z

    ON

    E2 Z

    ON

    E3

    THER

    MO

    STAT

    S

    SR 5

    04-4

    FUSE

    6 AM

    PFU

    SE6

    AMP

    FUSE

    6 AM

    PFU

    SE6

    AMP

    FUSE

    6 AM

    P

    XX

    RW

    RW

    RW

    RW

    ISO

    LATE

    DEN

    DSW

    ITC

    HTH

    ERM

    OST

    ATS

    (24

    VAC

    )

    PRIO

    RITY

    120

    VAC

    ZRH

    HN

    HN

    HN

    HN

    HN

    HZO

    NE4

    ZON

    E 2

    POW

    ER

    ZON

    E 1

    ZON

    E 3

    ZON

    E 4

    LED

    IND

    ICAT

    ORS

    ZON

    E 4

    PRIO

    RITY OFF

    ON

    PRIO

    RITY

    24 V

    AC

    COM

    T

    BO

    ILE

    R

    SLA

    VE REM

    OVE

    JUM

    PER

    TT

    T

    FOU

    R ZO

    NE

    SWIT

    CH

    ING

    REL

    AY

    120

    VAC

    CIR

    CU

    LATO

    RSZC

    IN

    PUT

    120

    VAC

    ZO

    NE

    1 ZO

    NE

    2 ZO

    NE

    3 ZO

    NE

    4

    Z

    ON

    E1 Z

    ON

    E2 Z

    ON

    E3

    THER

    MO

    STAT

    S

    SR 5

    04-4

    FUSE

    6 AM

    PFU

    SE6

    AMP

    FUSE

    6 AM

    PFU

    SE6

    AMP

    FUSE

    6 AM

    P

    XX

    RW

    RW

    RW

    RW

    ISO

    LATE

    DEN

    DSW

    ITC

    HTH

    ERM

    OST

    ATS

    (24

    VAC

    )

    PRIO

    RITY

    120

    VAC

    ZRH

    HN

    HN

    HN

    HN

    HN

    HZO

    NE4

    ZON

    E 2

    POW

    ER

    ZON

    E 1

    ZON

    E 3

    ZON

    E 4

    LED

    IND

    ICAT

    ORS

    ZON

    E 4

    PRIO

    RITY OFF

    ON

    PRIO

    RITY

    24 V

    AC

    COM

    T

    TO:

    "TT"

    ON

    BO

    ILER

    PRIO

    RITY

    OFF

    PRIO

    RITY

    OFF

    24 V

    ACO

    UTP

    UT

    (OPT

    ION

    AL)

  • 9

    120

    VAC

    INPU

    T

    TO:

    "TT"

    ON

    BO

    ILER

    H N

    SLA

    VE

    120

    VAC

    INPU

    T

    REM

    OVE

    JUM

    PER

    MA

    STE

    R

    TT

    T

    120

    VAC

    INPU

    T

    FOU

    R ZO

    NE

    SWIT

    CH

    ING

    REL

    AY

    120

    VAC

    CIR

    CU

    LATO

    RSZC

    IN

    PUT

    120

    VAC

    ZO

    NE

    1 ZO

    NE

    2 ZO

    NE

    3 ZO

    NE

    4

    Z

    ON

    E1 Z

    ON

    E2 Z

    ON

    E3

    THER

    MO

    STAT

    S

    SR 5

    04-4

    FUSE

    6 AM

    PFU

    SE6

    AMP

    FUSE

    6 AM

    PFU

    SE6

    AMP

    FUSE

    6 AM

    P

    XX

    RW

    RW

    RW

    RW

    ISO

    LATE

    DEN

    DSW

    ITC

    HTH

    ERM

    OST

    ATS

    (24

    VAC

    )

    PRIO

    RITY

    120

    VAC

    ZRH

    HN

    HN

    HN

    HN

    HN

    HZO

    NE4

    ZON

    E 2

    POW

    ER

    ZON

    E 1

    ZON

    E 3

    ZON

    E 4

    LED

    IND

    ICAT

    ORS

    ZON

    E 4

    PRIO

    RITY OFF

    ON

    PRIO

    RITY

    24 V

    AC

    COM

    T

    BO

    ILE

    R

    SLA

    VE REM

    OVE

    JUM

    PER

    TT

    T

    FOU

    R ZO

    NE

    SWIT

    CH

    ING

    REL

    AY

    120

    VAC

    CIR

    CU

    LATO

    RSZC

    IN

    PUT

    120

    VAC

    ZO

    NE

    1 ZO

    NE

    2 ZO

    NE

    3 ZO

    NE

    4

    Z

    ON

    E1 Z

    ON

    E2 Z

    ON

    E3

    THER

    MO

    STAT

    S

    SR 5

    04-4

    FUSE

    6 AM

    PFU

    SE6

    AMP

    FUSE

    6 AM

    PFU

    SE6

    AMP

    FUSE

    6 AM

    P

    XX

    RW

    RW

    RW

    RW

    ISO

    LATE

    DEN

    DSW

    ITC

    HTH

    ERM

    OST

    ATS

    (24

    VAC

    )

    PRIO

    RITY

    120

    VAC

    ZRH

    HN

    HN

    HN

    HN

    HN

    HZO

    NE4

    ZON

    E 2

    POW

    ER

    ZON

    E 1

    ZON

    E 3

    ZON

    E 4

    LED

    IND

    ICAT

    ORS

    ZON

    E 4

    PRIO

    RITY OFF

    ON

    PRIO

    RITY

    24 V

    AC

    COM

    T

    ON

    E ZO

    NE

    SWIT

    CH

    ING

    REL

    AY

    SR 5

    01-4

    FUSE

    6 AM

    P

    POW

    ER

    ZON

    E 1

    LED

    IND

    ICAT

    ORS

    FUSE

    6 AM

    P

    NH

    34

    45

    66

    N/O

    N/O

    N/C

    N/C

    CO

    MC

    OM

    120

    VAC

    INPU

    T

    TT

    CO

    M

    RW

    24 VAC

    CIR

    CU

    LATO

    R

    JUMPE

    R

    IND

    IREC

    TW

    ATER

    HEA

    TER

    AQU

    ASTA

    T O

    RTH

    ERM

    OST

    AT

    PRIO

    RITY

    OFF

    PRIO

    RITY

    OFF

    SR50

    1 Sw

    itchi

    ng R

    elay

    Cont

    rolli

    ng 2

    Swi

    tchi

    ng R

    elays

  • SR501-EXP Switching Relay Controlling Another Switching Relay

    120 VAC INPUT

    TO: "TT"ON BOILER

    BOILER

    H

    N

    MASTER

    TO: "TT" ON BOILER

    POWER

    ZONE 1

    LEDINDICATORS

    FUSE6 AMP

    FUSE6 AMP

    SR 501-EXP-4

    POWERCONTROLS

    SLAVE

    PRIORITY ONRESET

    PRIMARY PUMP ON

    POST PURGE ONPRIORITY PROTECT ON

    PUMP EXERCISE ON

    30 SEC/2 WK

    MASTER

    OFF

    OFF

    OFFOFFOFF

    NORMAL

    4 MIN/24 HOUR

    ACCESSORYPORT

    DHW HEATERCIRCULATOR

    HN/O N H120 VAC

    CIRCULATORPRIMARYOUTPUT

    N/CINPUT

    120 VAC

    ENDSWITCH

    RESETOVERRIDETHERMOSTATEXPANSION

    X WRX 1A 2CB24 VOLTS AC ONLY

    C

    SINGLE ZONEEXPANDABLE SWITCHING RELAY

    120 VAC INPUT

    SLAVEPRIORITY

    OFF

    SIX ZONE SWITCHING RELAY

    120 VAC CIRCULATORSZC

    INPUT120 VAC

    ZONE 1 ZONE 2

    ZONE 3 ZONE 4 ZONE 5 ZONE 6

    ZONE1 ZONE2 ZONE3 ZONE4 ZONE5

    THERMOSTATS

    SR 506-4

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    X X R W R W R W R W R W R WISOLATED

    ENDSWITCH THERMOSTATS (24 VAC)

    PRIORITY120 VACZR

    H H N H N H N H N H N H N H N HZONE6

    ZONE 2

    POWER

    ZONE 1

    ZONE 3

    ZONE 4

    ZONE 5

    ZONE 6

    LEDINDICATORS

    ZONE 6PRIORITY

    OFFON

    PRIORITY

    24 VAC

    COM

    REMOVEJUMPER

    T

    INDIRECTWATER HEATERAQUASTAT ORTHERMOSTAT

    NOTE 1: Terminals C are foroptional 24V thermostatCOMMON connections.

    10

  • SR501-EXP Switching Relay Controlling a Zone Valve Control

    TO BOILER AQUASTAT RELAY

    BOILER

    H

    N

    BOILER TURNS ON WHEN ANY ZONE VALVE OPENS.

    120 VACINPUT

    TO BOILER AQUASTAT RELAY

    SLAVE

    SYSTEM PUMP TURNS ON WHEN ANY ZONE VALVE OPENSEXCEPT WHEN THE DHW HEATER (SR501-EXP) CALLS.

    MASTER

    POWER

    ZONE 1

    LEDINDICATORS

    FUSE6 AMP

    FUSE6 AMP

    SR 501-EXP-4

    POWERCONTROLS

    SLAVE

    PRIORITY ONRESET

    PRIMARY PUMP ON

    POST PURGE ONPRIORITY PROTECT ON

    PUMP EXERCISE ON

    30 SEC/2 WK

    MASTER

    OFF

    OFF

    OFFOFFOFF

    NORMAL

    4 MIN/24 HOUR

    ACCESSORYPORT

    DHW HEATERCIRCULATOR

    HN/O N H120 VAC

    CIRCULATORPRIMARYOUTPUT

    N/CINPUT

    120 VAC

    ENDSWITCH

    RESETOVERRIDETHERMOSTATEXPANSION

    X WRX 1A 2CB24 VOLTS AC ONLY

    C

    SINGLE ZONEEXPANDABLE SWITCHING RELAY

    120 VAC INPUT

    1 2 3 4ZONE 1

    1 2 3 4ZONE 2

    1 2 3 4ZONE 3

    1 2 3 4ZONE 4

    1 2 3 4ZONE 5

    1 2 3 4ZONE 6

    PRIORITYZONE

    2 WIRE ZONE VALVE(NO END SWITCH)MUST USE JUMPER

    TACO3 WIRE

    ZONE VALVE

    123

    JUMPER3 & 4

    MOTOR ENDSWITCH

    4 WIRE ZONE VALVE(POWER OPEN,SELF CLOSING)

    JUMPER3 & 4

    ZVC 406 – 4

    SIX ZONEZONE VALVE CONTROL

    24 VAC

    FAC

    TORY

    INST

    ALLE

    DTR

    ANSF

    ORM

    ER

    120 VACINPUT

    WHITE

    BLACK

    POW

    ER IN

    24 V

    AC

    24 VAC

    FAC

    TORY

    INST

    ALLE

    DTR

    ANSF

    ORM

    ER

    120 VACINPUT

    WHITE

    BLACK

    DRYCONTACTS

    N/O COM N/C

    PUMP ENDSWITCH

    ZONE 6 PUMPEND SWITCH

    THERMOSTATS (24VAC)

    T STAT 1 VALVE 1

    T STAT 2 VALVE 2

    T STAT 3 VALVE 3

    T STAT 4 VALVE 4

    VALVE 5

    T STAT 6 VALVE 6

    POWER

    LEDINDICATORS

    T STAT 5

    ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5 ZONE 6ISOLATEDX X

    END SWITCH THERMOSTATS (24 VAC) PRIORITY

    24 VAC ZONE VALVES PRIORITY

    X X

    ZONE 6PRIORITY

    OFF

    ON

    NOTE 2: When a circulatoris used on the priority zoneinstead of a zone valve,jumper 3 and 4 of thepriority zone.

    FUSE5 AMP

    R W

    See NOTE 1

    R W R W R WC C CR W CC

    FUSE5 AMP

    R W C

    Powered from Transformer A Powered from Transformer B

    A

    B

    Powered from Transformer A Powered from Transformer B

    SYSTEMPUMP

    TT T

    INDIRECTWATER HEATERAQUASTAT ORTHERMOSTAT

    PRIORITYON

    NOTE 1: Terminals C are foroptional 24V thermostatCOMMON connections.

    11

  • 12

    2 Expandable Switching Relays Connected Together

    120 VAC INPUT

    BOILER

    SWITCH SETTINGSMaster/Slave: SlavePriority Zone: OffReset/Normal: Normal

    120 VAC INPUTH

    N

    SWITCH SETTINGSMaster/Slave: MasterPriority Zone: OnReset/Normal: Normal

    TO: "TT" ON BOILER

    DHWCIRCULATOR

    SLAVE

    MASTER

    FOUR ZONEEXPANDABLE

    SWITCHING RELAY

    POWERCONTROLS

    120 VAC CIRCULATORSZC

    INPUT120 VAC

    ZONE 1

    ZONE 2 ZONE 3 ZONE 4

    ZONE1 ZONE2 ZONE3

    THERMOSTATS

    SR 504-EXP-4

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    NETEXPANSIONMAIN PRIORITY

    X X X X A B C R W C R W C R W C R W C 1 2

    END SWITCH THERMOSTATS (24 VAC)

    PRIORITY N/CPRIMARY

    120 VACZR

    H H N H N H N H N H N H N H N H

    SLAVE

    PRIORITY ONRESET

    PRIMARY PUMP ON

    POST PURGE ONPRIORITY PROTECT ON

    PUMP EXERCISE ON

    30 SEC/2 WK

    MASTER

    OFF

    OFF

    OFFOFFOFF

    NORMAL

    LOW LIMIT (ZC) ON OFF4 MIN/24 HOUR

    ZONE4 ZONE4

    PRIORITY

    ACCESSORYPORT

    ZONE 2

    POWER

    ZONE 1

    ZONE 3

    ZONE 4

    LEDINDICATORS

    PRIMARY SYSTEMCIRCULATOR(OPTIONAL)

    TO: "TT" ON BOILER WITH DHW "TT" INPUT

    SIX ZONEEXPANDABLE SWITCHING RELAY

    POWERCONTROLS

    120 VAC CIRCULATORSZC

    INPUT120 VAC

    ZONE 1 ZONE 2

    ZONE 3

    ZONE 4 ZONE 5 ZONE 6

    ZONE1 ZONE2 ZONE3 ZONE4 ZONE5

    THERMOSTATS

    SR 506-EXP-4

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    NETEXPANSIONMAIN PRIORITY

    X X X X A B C R W C R W C R W C R W C R W C R W C 1 2

    END SWITCH THERMOSTATS (24 VAC)

    PRIORITY N/CPRIMARY

    120 VACZR

    H H N H N H N H N H N H N H N H N H N H

    SLAVE

    PRIORITY ON

    RESET

    PRIMARY PUMP ON

    POST PURGE ONPRIORITY PROTECT ON

    PUMP EXERCISE ON

    30 SEC/2 WK

    MASTER

    OFF

    OFF

    OFFOFFOFF

    NORMAL

    LOW LIMIT (ZC) ON OFF4 MIN/24 HOUR

    ZONE6 ZONE6

    PRIORITY

    ACCESSORYPORT

    ZONE 2

    POWER

    ZONE 1

    ZONE 3

    ZONE 4

    ZONE 5

    ZONE 6

    LEDINDICATORS

    T

    T

    INDIRECTWATER HEATERAQUASTAT ORTHERMOSTAT

    NOTE 1: Terminals C are foroptional 24V thermostatCOMMON connections.

    See NOTE 1

    See NOTE 1

  • 3 Ex

    pand

    able

    Switc

    hing

    Rela

    ys C

    onne

    cted

    Toge

    ther

    120

    VAC

    INPU

    T

    BO

    ILE

    R

    SWIT

    CH

    SET

    TIN

    GS

    Mas

    ter/

    Slav

    e: M

    aste

    rPr

    iorit

    y Zo

    ne: O

    nRe

    set/

    Nor

    mal

    : Nor

    mal

    120

    VAC

    INPU

    TH N

    SWIT

    CH

    SET

    TIN

    GS

    Mas

    ter/

    Slav

    e: S

    lave

    Prio

    rity

    Zone

    : Off

    Rese

    t/N

    orm

    al: N

    orm

    al

    TO:

    "TT"

    ON

    BO

    ILER

    SLA

    VE

    MA

    STE

    R

    FOU

    R ZO

    NE

    EXPA

    ND

    ABL

    ESW

    ITC

    HIN

    G R

    ELA

    Y

    POW

    ERC

    ON

    TRO

    LS

    120

    VAC

    CIR

    CU

    LATO

    RSZC

    IN

    PUT

    120

    VAC

    ZON

    E 1

    ZON

    E 2

    ZON

    E 3

    ZON

    E 4

    ZON

    E1 Z

    ON

    E2 Z

    ON

    E3

    THER

    MO

    STAT

    S

    SR 5

    04-E

    XP-

    4

    FUSE

    6 AM

    PFU

    SE6

    AMP

    FUSE

    6 AM

    PFU

    SE6

    AMP

    FUSE

    6 AM

    PFU

    SE6

    AMP

    NET

    EXPA

    NSI

    ON

    MAI

    NPR

    IORI

    TY

    XX

    XX

    AB

    CR

    WC

    RW

    CR

    WC

    RW

    C1

    2

    END

    SW

    ITC

    HTH

    ERM

    OST

    ATS

    (24

    VAC

    )

    PRIO

    RITY

    N/C

    PRIM

    ARY

    120

    VAC

    ZRH

    HN

    HN

    HN

    HN

    HN

    HN

    HN

    H

    SLA

    VE

    PR

    IOR

    ITY

    ON

    RES

    ET

    PR

    IMA

    RY

    PU

    MP

    ON

    PO

    ST

    PU

    RG

    E O

    NP

    RIO

    RIT

    Y P

    RO

    TEC

    T O

    NP

    UM

    P E

    XER

    CIS

    E O

    N

    30 S

    EC/2

    WK

    MA

    STE

    R

    OFF

    OFF

    OFF

    OFF

    OFF

    NO

    RM

    AL

    LOW

    LIM

    IT (Z

    C) O

    NO

    FF4

    MIN

    /24

    HO

    UR

    ZON

    E4ZO

    NE4

    PRIO

    RITY

    ACC

    ESSO

    RYPO

    RT

    ZON

    E 2

    POW

    ER

    ZON

    E 1

    ZON

    E 3

    ZON

    E 4

    LED

    IND

    ICAT

    ORS

    TO:

    "TT"

    ON

    BO

    ILER

    WIT

    H

    D

    HW

    "TT

    " IN

    PUT

    SIX

    ZO

    NE

    EXPA

    ND

    ABL

    E SW

    ITC

    HIN

    G R

    ELA

    Y

    POW

    ERC

    ON

    TRO

    LS

    120

    VAC

    CIR

    CU

    LATO

    RSZC

    IN

    PUT

    120

    VAC

    ZON

    E 1

    ZON

    E 2

    ZON

    E 3

    ZON

    E 4

    ZON

    E 5

    ZON

    E 6

    ZON

    E1 Z

    ON

    E2 Z

    ON

    E3 Z

    ON

    E4 Z

    ON

    E5

    THER

    MO

    STAT

    S

    SR 5

    06-E

    XP-

    4

    FUSE

    6 AM

    PFU

    SE6

    AMP

    FUSE

    6 AM

    PFU

    SE6

    AMP

    FUSE

    6 AM

    PFU

    SE6

    AMP

    FUSE

    6 AM

    PFU

    SE6

    AMP

    NET

    EXPA

    NSI

    ON

    MAI

    NPR

    IORI

    TY

    XX

    XX

    AB

    CR

    WC

    RW

    CR

    WC

    RW

    CR

    WC

    RW

    C1

    2

    END

    SW

    ITC

    HTH

    ERM

    OST

    ATS

    (24

    VAC

    )

    PRIO

    RITY

    N/C

    PRIM

    ARY

    120

    VAC

    ZRH

    HN

    HN

    HN

    HN

    HN

    HN

    HN

    HN

    HN

    H

    SLA

    VE

    PR

    IOR

    ITY

    ON

    RES

    ET

    PR

    IMA

    RY

    PU

    MP

    ON

    PO

    ST

    PU

    RG

    E O

    NP

    RIO

    RIT

    Y P

    RO

    TEC

    T O

    NP

    UM

    P E

    XER

    CIS

    E O

    N

    30 S

    EC/2

    WK

    MA

    STE

    R

    OFF

    OFF

    OFF

    OFF

    OFF

    NO

    RM

    AL

    LOW

    LIM

    IT (Z

    C) O

    NO

    FF4

    MIN

    /24

    HO

    UR

    ZON

    E6ZO

    NE6

    PRIO

    RITY

    ACC

    ESSO

    RYPO

    RT

    ZON

    E 2

    POW

    ER

    ZON

    E 1

    ZON

    E 3

    ZON

    E 4

    ZON

    E 5

    ZON

    E 6

    LED

    IND

    ICAT

    ORS

    T

    T

    IND

    IREC

    TW

    ATER

    HEA

    TER

    AQU

    ASTA

    T O

    RTH

    ERM

    OST

    AT

    FOU

    R ZO

    NE

    EXPA

    ND

    ABL

    ESW

    ITC

    HIN

    G R

    ELA

    Y

    POW

    ERC

    ON

    TRO

    LS

    120

    VAC

    CIR

    CU

    LATO

    RSZC

    IN

    PUT

    120

    VAC

    ZON

    E 1

    ZON

    E 2

    ZON

    E 3

    ZON

    E 4

    ZON

    E1 Z

    ON

    E2 Z

    ON

    E3

    THER

    MO

    STAT

    S

    SR 5

    04-E

    XP-

    4

    FUSE

    6 AM

    PFU

    SE6

    AMP

    FUSE

    6 AM

    PFU

    SE6

    AMP

    FUSE

    6 AM

    PFU

    SE6

    AMP

    NET

    EXPA

    NSI

    ON

    MAI

    NPR

    IORI

    TY

    XX

    XX

    AB

    CR

    WC

    RW

    CR

    WC

    RW

    C1

    2

    END

    SW

    ITC

    HTH

    ERM

    OST

    ATS

    (24

    VAC

    )

    PRIO

    RITY

    N/C

    PRIM

    ARY

    120

    VAC

    ZRH

    HN

    HN

    HN

    HN

    HN

    HN

    HN

    H

    SLA

    VE

    PR

    IOR

    ITY

    ON

    RES

    ET

    PR

    IMA

    RY

    PU

    MP

    ON

    PO

    ST

    PU

    RG

    E O

    NP

    RIO

    RIT

    Y P

    RO

    TEC

    T O

    NP

    UM

    P E

    XER

    CIS

    E O

    N

    30 S

    EC/2

    WK

    MA

    STE

    R

    OFF

    OFF

    OFF

    OFF

    OFF

    NO

    RM

    AL

    LOW

    LIM

    IT (Z

    C) O

    NO

    FF4

    MIN

    /24

    HO

    UR

    ZON

    E4ZO

    NE4

    PRIO

    RITY

    ACC

    ESSO

    RYPO

    RT

    ZON

    E 2

    POW

    ER

    ZON

    E 1

    ZON

    E 3

    ZON

    E 4

    LED

    IND

    ICAT

    ORS

    TSW

    ITC

    H S

    ETTI

    NG

    SM

    aste

    r/Sl

    ave:

    Sla

    vePr

    iorit

    y Zo

    ne: O

    ffRe

    set/

    Nor

    mal

    : Nor

    mal

    SLA

    VE

    PRIM

    ARY

    SYST

    EMC

    IRC

    ULA

    TOR

    (OPT

    ION

    AL)

    DH

    WC

    IRC

    ULA

    TOR

    NO

    TE 1

    : Ter

    min

    als

    C a

    re fo

    rop

    tiona

    l 24V

    the

    rmos

    tat

    CO

    MM

    ON

    con

    nect

    ions

    .

    See

    NO

    TE 1

    See

    NO

    TE 1

    See

    NO

    TE 1

    13

  • 120

    VAC

    INPU

    T

    TO:

    "TT"

    ON

    BO

    ILER

    H N

    SLA

    VE

    120

    VAC

    INPU

    T

    MA

    STE

    R

    TT

    T

    120

    VAC

    INPU

    T

    FOU

    R ZO

    NE

    SWIT

    CH

    ING

    REL

    AY

    120

    VAC

    CIR

    CU

    LATO

    RSZC

    IN

    PUT

    120

    VAC

    ZO

    NE

    1 ZO

    NE

    2 ZO

    NE

    3 ZO

    NE

    4

    Z

    ON

    E1 Z

    ON

    E2 Z

    ON

    E3

    THER

    MO

    STAT

    S

    SR 5

    04-4

    FUSE

    6 AM

    PFU

    SE6

    AMP

    FUSE

    6 AM

    PFU

    SE6

    AMP

    FUSE

    6 AM

    P

    XX

    RW

    RW

    RW

    RW

    ISO

    LATE

    DEN

    DSW

    ITC

    HTH

    ERM

    OST

    ATS

    (24

    VAC

    )

    PRIO

    RITY

    120

    VAC

    ZRH

    HN

    HN

    HN

    HN

    HN

    HZO

    NE4

    ZON

    E 2

    POW

    ER

    ZON

    E 1

    ZON

    E 3

    ZON

    E 4

    LED

    IND

    ICAT

    ORS

    ZON

    E 4

    PRIO

    RITY OFF

    ON

    PRIO

    RITY

    24 V

    AC

    COM

    BO

    ILE

    R

    SLA

    VE

    ZON

    EN

    OT

    USE

    D

    TT

    T

    FOU

    R ZO

    NE

    SWIT

    CH

    ING

    REL

    AY

    120

    VAC

    CIR

    CU

    LATO

    RSZC

    IN

    PUT

    120

    VAC

    ZO

    NE

    1 ZO

    NE

    2 ZO

    NE

    3 ZO

    NE

    4

    Z

    ON

    E1 Z

    ON

    E2 Z

    ON

    E3

    THER

    MO

    STAT

    S

    SR 5

    04-4

    FUSE

    6 AM

    PFU

    SE6

    AMP

    FUSE

    6 AM

    PFU

    SE6

    AMP

    FUSE

    6 AM

    P

    XX

    RW

    RW

    RW

    RW

    ISO

    LATE

    DEN

    DSW

    ITC

    HTH

    ERM

    OST

    ATS

    (24

    VAC

    )

    PRIO

    RITY

    120

    VAC

    ZRH

    HN

    HN

    HN

    HN

    HN

    HZO

    NE4

    ZON

    E 2

    POW

    ER

    ZON

    E 1

    ZON

    E 3

    ZON

    E 4

    LED

    IND

    ICAT

    ORS

    ZON

    E 4

    PRIO

    RITY OFF

    ON

    PRIO

    RITY

    24 V

    AC

    COM

    IND

    IREC

    TW

    ATER

    HEA

    TER

    AQU

    ASTA

    T O

    RTH

    ERM

    OST

    AT

    ZON

    EN

    OT

    USE

    D

    JUM

    PER

    JUM

    PER

    PRIO

    RITY

    ON

    PRIO

    RITY

    ON

    TWO

    ZO

    NE

    SWIT

    CH

    ING

    REL

    AY

    CIR

    CU

    LATO

    RS

    ZC

    INPU

    T12

    0 VA

    C

    ZO

    NE

    1 ZO

    NE

    2PR

    IORI

    TY

    Z

    ON

    E1

    ZO

    NE2

    PRIO

    RITY

    SR 5

    02-4

    FUSE

    6 AM

    PFU

    SE6

    AMP

    FUSE

    6 AM

    P

    XX

    RW

    RW

    ISO

    LATE

    DEN

    DSW

    ITC

    HTH

    ERM

    OST

    ATS

    120

    VAC

    ZR

    HH

    NH

    NH

    NH

    ZON

    E 2

    POW

    ER

    ZON

    E 1

    LED

    IND

    ICAT

    ORS

    ZON

    E 2

    PRIO

    RITY OFF

    ON

    JUM

    PER

    24 V

    AC

    COM

    120

    VAC

    PRIO

    RITY

    OFF

    IND

    IREC

    TW

    ATER

    HEA

    TER

    AQU

    ASTA

    T O

    RTH

    ERM

    OST

    AT

    2 In

    dire

    ct W

    ater

    Hea

    ters

    with

    Prio

    rity

    Conn

    ecte

    d to

    Sta

    ndar

    d Sw

    itchi

    ng R

    elays

    14

  • 15

    TO:

    "TT"

    ON

    BO

    ILER

    120

    VAC

    INPU

    T

    BO

    ILE

    R

    IND

    IREC

    TW

    ATER

    HEA

    TER

    AQU

    ASTA

    T O

    RTH

    ERM

    OST

    AT

    TWO

    ZO

    NE

    SWIT

    CH

    ING

    REL

    AY

    CIR

    CU

    LATO

    RS

    ZC

    INPU

    T12

    0 VA

    C

    ZO

    NE

    1 ZO

    NE

    2PR

    IORI

    TY

    Z

    ON

    E1

    ZO

    NE2

    PRIO

    RITY

    SR 5

    02-4

    FUSE

    6 AM

    PFU

    SE6

    AMP

    FUSE

    6 AM

    P

    XX

    RW

    RW

    ISO

    LATE

    DEN

    DSW

    ITC

    HTH

    ERM

    OST

    ATS

    120

    VAC

    ZR

    HH

    NH

    NH

    NH

    ZON

    E 2

    POW

    ER

    ZON

    E 1

    LED

    IND

    ICAT

    ORS

    ZON

    E 2

    PRIO

    RITY OFF

    ON

    JUM

    PER

    24 V

    AC

    COM

    DH

    W C

    IRC

    ULA

    TORS

    PRIO

    RITY

    OFF

    IND

    IREC

    TW

    ATER

    HEA

    TER

    AQU

    ASTA

    T O

    RTH

    ERM

    OST

    AT

    120

    VAC

    INPU

    T

    H N

    FOU

    R ZO

    NE

    EXPA

    ND

    ABL

    ESW

    ITC

    HIN

    G R

    ELA

    Y

    POW

    ERC

    ON

    TRO

    LS

    120

    VAC

    CIR

    CU

    LATO

    RSZC

    IN

    PUT

    120

    VAC

    ZON

    E 1

    ZON

    E 2

    ZON

    E 3

    ZON

    E 4

    ZON

    E1 Z

    ON

    E2 Z

    ON

    E3

    THER

    MO

    STAT

    S

    SR 5

    04-E

    XP-

    4

    FUSE

    6 AM

    PFU

    SE6

    AMP

    FUSE

    6 AM

    PFU

    SE6

    AMP

    FUSE

    6 AM

    PFU

    SE6

    AMP

    NET

    EXPA

    NSI

    ON

    MAI

    NPR

    IORI

    TY

    XX

    XX

    AB

    CR

    WC

    RW

    CR

    WC

    RW

    C1

    2

    END

    SW

    ITC

    HTH

    ERM

    OST

    ATS

    (24

    VAC

    )

    PRIO

    RITY

    N/C

    PRIM

    ARY

    120

    VAC

    ZRH

    HN

    HN

    HN

    HN

    HN

    HN

    HN

    H

    SLA

    VE

    PR

    IOR

    ITY

    ON

    RES

    ET

    PR

    IMA

    RY

    PU

    MP

    ON

    PO

    ST

    PU

    RG

    E O

    NP

    RIO

    RIT

    Y P

    RO

    TEC

    T O

    NP

    UM

    P E

    XER

    CIS

    E O

    N

    30 S

    EC/2

    WK

    MA

    STE

    R

    OFF

    OFF

    OFF

    OFF

    OFF

    NO

    RM

    AL

    LOW

    LIM

    IT (Z

    C) O

    NO

    FF4

    MIN

    /24

    HO

    UR

    ZON

    E4ZO

    NE4

    PRIO

    RITY

    ACC

    ESSO

    RYPO

    RT

    ZON

    E 2

    POW

    ER

    ZON

    E 1

    ZON

    E 3

    ZON

    E 4

    LED

    IND

    ICAT

    ORS

    T

    SWIT

    CH

    SET

    TIN

    GS

    Mas

    ter/

    Slav

    e: M

    aste

    rPr

    iorit

    y Zo

    ne: O

    nRe

    set/

    Nor

    mal

    : Nor

    mal

    MA

    STE

    R

    PRIM

    ARY

    SYST

    EMC

    IRC

    ULA

    TOR

    (OPT

    ION

    AL)

    ZON

    EN

    OT

    USE

    D

    FOU

    R ZO

    NE

    EXPA

    ND

    ABL

    ESW

    ITC

    HIN

    G R

    ELA

    Y

    POW

    ERC

    ON

    TRO

    LS

    120

    VAC

    CIR

    CU

    LATO

    RSZC

    IN

    PUT

    120

    VAC

    ZON

    E 1

    ZON

    E 2

    ZON

    E 3

    ZON

    E 4

    ZON

    E1 Z

    ON

    E2 Z

    ON

    E3

    THER

    MO

    STAT

    S

    SR 5

    04-E

    XP-

    4

    FUSE

    6 AM

    PFU

    SE6

    AMP

    FUSE

    6 AM

    PFU

    SE6

    AMP

    FUSE

    6 AM

    PFU

    SE6

    AMP

    NET

    EXPA

    NSI

    ON

    MAI

    NPR

    IORI

    TY

    XX

    XX

    AB

    CR

    WC

    RW

    CR

    WC

    RW

    C1

    2

    END

    SW

    ITC

    HTH

    ERM

    OST

    ATS

    (24

    VAC

    )

    PRIO

    RITY

    N/C

    PRIM

    ARY

    120

    VAC

    ZRH

    HN

    HN

    HN

    HN

    HN

    HN

    HN

    H

    SLA

    VE

    PR

    IOR

    ITY

    ON

    RES

    ET

    PR

    IMA

    RY

    PU

    MP

    ON

    PO

    ST

    PU

    RG

    E O

    NP

    RIO

    RIT

    Y P

    RO

    TEC

    T O

    NP

    UM

    P E

    XER

    CIS

    E O

    N

    30 S

    EC/2

    WK

    MA

    STE

    R

    OFF

    OFF

    OFF

    OFF

    OFF

    NO

    RM

    AL

    LOW

    LIM

    IT (Z

    C) O

    NO

    FF4

    MIN

    /24

    HO

    UR

    ZON

    E4ZO

    NE4

    PRIO

    RITY

    ACC

    ESSO

    RYPO

    RT

    ZON

    E 2

    POW

    ER

    ZON

    E 1

    ZON

    E 3

    ZON

    E 4

    LED

    IND

    ICAT

    ORS

    TSW

    ITC

    H S

    ETTI

    NG

    SM

    aste

    r/Sl

    ave:

    Sla

    vePr

    iorit

    y Zo

    ne: O

    ffRe

    set/

    Nor

    mal

    : Nor

    mal

    SLA

    VE

    NO

    TE 1

    : Ter

    min

    als

    C a

    re fo

    rop

    tiona

    l 24V

    the

    rmos

    tat

    CO

    MM

    ON

    con

    nect

    ions

    .

    See

    NO

    TE 1

    2 In

    dire

    ct W

    ater

    Hea

    ters

    with

    Prio

    rity

    Conn

    ecte

    d to

    EXP

    Swi

    tchi

    ng R

    elays

  • PC700 Boiler Reset Control Connected to SR501-EXP Switching Relay

    ZONECONTROL

    BOILSEN

    OUTSEN

    BOILER SENSOR

    OUTDOORSENSOR

    PC700

    SWITCH SETTINGSMaster/Slave: MasterReset/Normal: Reset

    SYSTEMCIRCULATOR

    TO: "TT" ON BOILER

    POWER

    ZONE 1

    LEDINDICATORS

    FUSE6 AMP

    FUSE6 AMP

    SR 501-EXP-4

    POWERCONTROLS

    SLAVE

    PRIORITY ONRESET

    PRIMARY PUMP ON

    POST PURGE ONPRIORITY PROTECT ON

    PUMP EXERCISE ON

    30 SEC/2 WK

    MASTER

    OFF

    OFF

    OFFOFFOFF

    NORMAL

    4 MIN/24 HOUR

    ACCESSORYPORT

    HN/O N H120 VAC

    CIRCULATORPRIMARYOUTPUT

    N/CINPUT

    120 VAC

    ENDSWITCH

    RESETOVERRIDETHERMOSTATEXPANSION

    X WRX 1A 2CB24 VOLTS AC ONLY

    C

    SINGLE ZONEEXPANDABLE SWITCHING RELAY

    THERMOSTAT

    T

    120 VAC INPUTH

    N

    BOILER

    To: DHW Aquastat if PC700Boiler Reset Temperature isto be overridden duringDHW call.

    NOTE 1: Terminals C are foroptional 24V thermostatCOMMON connections.

    16

  • 17

    FOUR ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY

    ZONE 4

    ONOFF

    PRIORITY

    120V RELAY

    120 VOLT CIRCULATORSZC ZR

    X XEND

    SWITCHPOWERINPUT

    120 VACINPUT

    ZONE1 ZONE2

    ZONE3

    ZONE4

    ZONE1 ZONE2 ZONE3 ZONE4

    FUSE 1 AMP

    24 V

    ACPO

    WER

    SR 504

    ZONE 2

    POWERZONE 1

    ZONE 3ZONE 4

    THERMOSTATS

    BOILER

    H

    N

    MASTEREXISTINGZONECONTROL

    T

    PRIMARYSYSTEM

    CIRCULATOR(Optional)

    TO: "TT" ON BOILER

    JUMPER

    DHWHEATER

    CIRCULATOR

    Note: If Zone Control comes on without a call for heat,reverse Reset Override input (1 & 2) wires on SR501-EXP.

    ZONECONTROL

    BOILSEN

    OUTSEN

    BOILER SENSOR

    OUTDOORSENSOR

    PC700

    SWITCH SETTINGSMaster/Slave: MasterReset/Normal: Reset

    POWER

    ZONE 1

    LEDINDICATORS

    FUSE6 AMP

    FUSE6 AMP

    SR 501-EXP-4

    POWERCONTROLS

    SLAVE

    PRIORITY ONRESET

    PRIMARY PUMP ON

    POST PURGE ONPRIORITY PROTECT ON

    PUMP EXERCISE ON

    30 SEC/2 WK

    MASTER

    OFF

    OFF

    OFFOFFOFF

    NORMAL

    4 MIN/24 HOUR

    ACCESSORYPORT

    HN/O N H120 VAC

    CIRCULATORPRIMARYOUTPUT

    N/CINPUT

    120 VAC

    ENDSWITCH

    RESETOVERRIDETHERMOSTATEXPANSION

    X WRX 1A 2CB24 VOLTS AC ONLY

    C

    SINGLE ZONEEXPANDABLE SWITCHING RELAY

    INDIRECTWATER HEATERAQUASTAT ORTHERMOSTAT

    SR501-EXP and PC700 Boiler Reset Control Connected to an Existing Switching Relay

    FOUR ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY

    ZONE 4

    ONOFF

    PRIORITY

    120V RELAY

    120 VOLT CIRCULATORSZC ZR

    X XEND

    SWITCHPOWERINPUT

    120 VACINPUT

    ZONE1 ZONE2

    ZONE3

    ZONE4

    ZONE1 ZONE2 ZONE3 ZONE4

    FUSE 1 AMP

    24 V

    ACPO

    WER

    SR 504

    ZONE 2

    POWERZONE 1

    ZONE 3ZONE 4

    THERMOSTATS

    BOILER

    H

    N

    EXISTINGZONECONTROL

    T

    TO: "TT" ON BOILER

    REMOVEJUMPER

    DHWHEATER

    CIRCULATOR

    ZONECONTROL

    BOILSEN

    OUTSEN

    BOILER SENSOR

    OUTDOORSENSOR

    PC700

    SLAVE

    MASTER

    SWITCH SETTINGSMaster/Slave: MasterReset/Normal: Reset

    POWER

    ZONE 1

    LEDINDICATORS

    FUSE6 AMP

    FUSE6 AMP

    SR 501-EXP-4

    POWERCONTROLS

    SLAVE

    PRIORITY ONRESET

    PRIMARY PUMP ON

    POST PURGE ONPRIORITY PROTECT ON

    PUMP EXERCISE ON

    30 SEC/2 WK

    MASTER

    OFF

    OFF

    OFFOFFOFF

    NORMAL

    4 MIN/24 HOUR

    ACCESSORYPORT

    HN/O N H120 VAC

    CIRCULATORPRIMARYOUTPUT

    N/CINPUT

    120 VAC

    ENDSWITCH

    RESETOVERRIDETHERMOSTATEXPANSION

    X WRX 1A 2CB24 VOLTS AC ONLY

    C

    SINGLE ZONEEXPANDABLE SWITCHING RELAY

    INDIRECTWATER HEATERAQUASTAT ORTHERMOSTAT

    NOTE 1: Terminals C are foroptional 24V thermostatCOMMON connections.

    See NOTE 1

    Connecting a DHW Heater to an Existing Heating Only Switching RelayUsing an SR501-EXP and PC700 Boiler Reset Control

  • SR501-EXP and PC700 Boiler Reset Control Connected to an Existing Zone Valve Control

    120 VACINPUT

    BOILER

    H

    N

    EXISTINGZONECONTROL

    TO: "TT" ON BOILER

    DHW HEATERCIRCULATOR

    Note: If Zone Control comes on without a call for heat,reverse Reset Override input (1 & 2) wires on SR501-EXP.

    ZONECONTROL

    BOILSEN

    OUTSEN

    BOILER SENSOR

    OUTDOORSENSOR

    PC700

    24 VAC

    POWER IN

    ZONE 2 ZONE 3 ZONE 4

    MODENORMAL RESET

    FUSE

    (3 AMP M

    AX)

    ZONE 1T T T T T T T T

    ZONE 4PRIORITY

    OFF

    ON

    N/O COM N/CZONE 4 RELAY 1 2 3 4 1 2 3 4

    ZONE 1 ZONE 2

    2 WIRE ZONE VALVE(NO END SWITCH)

    JUMPER3 & 4

    TACO3 WIRE ZONE VALVE

    123

    1 2 3 4ZONE 3

    MOTOR ENDSWITCH

    4 WIRE ZONE VALVE(POWER OPEN,SELF CLOSING)

    T STAT 1VALVE 1T STAT 2VALVE 2T STAT 3VALVE 3T STAT 4VALVE 4POWER

    ENDSWITCH

    EXTRAEND

    SWITCH

    MAIN

    24VAC

    FAC

    TORY

    INST

    ALLE

    DTR

    ANSF

    ORM

    ER

    120 VACINPUT

    WHITE

    BLACK

    ZVC 404 FOUR ZONE ZONE VALVE CONTROL

    WITH OPTIONAL PRIORITY

    1 2 3 4ZONE 4

    PRIORITYZONE

    JUMPER3 & 4 SEE NOTE

    THERMOSTATS

    T TT

    Note: When a circulator is used on thepriority zone instead of a zone valve,jumper 3 and 4 of the priority zone.

    ZONE VALVE SYSTEMCIRCULATOR

    INDIRECTWATER HEATERAQUASTAT ORTHERMOSTAT

    MASTER

    PRIMARY SYSTEMCIRCULATOR

    (Optional)

    SWITCH SETTINGSMaster/Slave: MasterReset/Normal: Reset

    POWER

    ZONE 1

    LEDINDICATORS

    FUSE6 AMP

    FUSE6 AMP

    SR 501-EXP-4

    POWERCONTROLS

    SLAVE

    PRIORITY ONRESET

    PRIMARY PUMP ON

    POST PURGE ONPRIORITY PROTECT ON

    PUMP EXERCISE ON

    30 SEC/2 WK

    MASTER

    OFF

    OFF

    OFFOFFOFF

    NORMAL

    4 MIN/24 HOUR

    ACCESSORYPORT

    HN/O N H120 VAC

    CIRCULATORPRIMARYOUTPUT

    N/CINPUT

    120 VAC

    ENDSWITCH

    RESETOVERRIDETHERMOSTATEXPANSION

    X WRX 1A 2CB24 VOLTS AC ONLY

    C

    SINGLE ZONEEXPANDABLE SWITCHING RELAY

    Connecting a DHW Heater to an Existing Heating Only Zone Valve ControlUsing an SR501-EXP and PC700 Boiler Reset Control

    120 VACINPUT

    BOILER

    H

    N

    EXISTINGZONECONTROL

    DHW HEATERCIRCULATOR

    TO: "TT" ON BOILER

    ZONECONTROL

    BOILSEN

    OUTSEN

    BOILER SENSOR

    OUTDOORSENSOR

    PC700

    24 VAC

    POWER IN

    ZONE 2 ZONE 3 ZONE 4

    MODENORMAL RESET

    FUSE

    (3 AMP M

    AX)

    ZONE 1T T T T T T T T

    ZONE 4PRIORITY

    OFF

    ON

    N/O COM N/CZONE 4 RELAY 1 2 3 4 1 2 3 4

    ZONE 1 ZONE 2

    2 WIRE ZONE VALVE(NO END SWITCH)

    JUMPER3 & 4

    TACO3 WIRE ZONE VALVE

    123

    1 2 3 4ZONE 3

    MOTOR ENDSWITCH

    4 WIRE ZONE VALVE(POWER OPEN,SELF CLOSING)

    T STAT 1VALVE 1T STAT 2VALVE 2T STAT 3VALVE 3T STAT 4VALVE 4POWER

    ENDSWITCH

    EXTRAEND

    SWITCH

    MAIN

    24VAC

    FAC

    TORY

    INST

    ALLE

    DTR

    ANSF

    ORM

    ER

    120 VACINPUT

    WHITE

    BLACK

    ZVC 404 FOUR ZONE ZONE VALVE CONTROL

    WITH OPTIONAL PRIORITY

    1 2 3 4ZONE 4

    PRIORITYZONE

    JUMPER3 & 4 SEE NOTE

    THERMOSTATS

    T TT

    Note: When a circulator is used on thepriority zone instead of a zone valve,jumper 3 and 4 of the priority zone.ZONE VALVE SYSTEM

    CIRCULATOR

    SLAVE

    MASTER

    SWITCH SETTINGSMaster/Slave: MasterReset/Normal: Reset

    POWER

    ZONE 1

    LEDINDICATORS

    FUSE6 AMP

    FUSE6 AMP

    SR 501-EXP-4

    POWERCONTROLS

    SLAVE

    PRIORITY ONRESET

    PRIMARY PUMP ON

    POST PURGE ONPRIORITY PROTECT ON

    PUMP EXERCISE ON

    30 SEC/2 WK

    MASTER

    OFF

    OFF

    OFFOFFOFF

    NORMAL

    4 MIN/24 HOUR

    ACCESSORYPORT

    HN/O N H120 VAC

    CIRCULATORPRIMARYOUTPUT

    N/CINPUT

    120 VAC

    ENDSWITCH

    RESETOVERRIDETHERMOSTATEXPANSION

    X WRX 1A 2CB24 VOLTS AC ONLY

    C

    SINGLE ZONEEXPANDABLE SWITCHING RELAY

    INDIRECTWATER HEATERAQUASTAT ORTHERMOSTAT

    NOTE 1: Terminals C are foroptional 24V thermostatCOMMON connections.

    See NOTE 1

    18

  • 19

    SR501-EXP and PC702 Boiler Reset Control Connected to an Existing Switching Relay

    FOUR ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY

    ZONE 4

    ONOFF

    PRIORITY

    120V RELAY

    120 VOLT CIRCULATORSZC ZR

    X XEND

    SWITCHPOWERINPUT

    120 VACINPUT

    ZONE1 ZONE2

    ZONE3

    ZONE4

    ZONE1 ZONE2 ZONE3 ZONE4

    FUSE 1 AMP

    24 V

    ACPO

    WER

    SR 504

    ZONE 2

    POWERZONE 1

    ZONE 3ZONE 4

    THERMOSTATS

    H

    N

    MASTEREXISTINGZONECONTROL

    T

    PRIMARYSYSTEM

    CIRCULATOR(Optional)

    JUMPER

    DHWHEATER

    CIRCULATOR

    Note: If Zone Control comes on without a call for heat,reverse Reset Override input (1 & 2) wires on SR501-EXP.

    SWITCH SETTINGSMaster/Slave: MasterReset/Normal: Reset

    POWER

    ZONE 1

    LEDINDICATORS

    FUSE6 AMP

    FUSE6 AMP

    SR 501-EXP-4

    POWERCONTROLS

    SLAVE

    PRIORITY ONRESET

    PRIMARY PUMP ON

    POST PURGE ONPRIORITY PROTECT ON

    PUMP EXERCISE ON

    30 SEC/2 WK

    MASTER

    OFF

    OFF

    OFFOFFOFF

    NORMAL

    4 MIN/24 HOUR

    ACCESSORYPORT

    HN/O N H120 VAC

    CIRCULATORPRIMARYOUTPUT

    N/CINPUT

    120 VAC

    ENDSWITCH

    RESETOVERRIDETHERMOSTATEXPANSION

    X WRX 1A 2CB24 VOLTS AC ONLY

    C

    SINGLE ZONEEXPANDABLE SWITCHING RELAY

    INDIRECTWATER HEATERAQUASTAT ORTHERMOSTAT

    ZONECONTROL

    BOILSEN

    OUTSEN

    BOILER SENSOR

    OUTDOORSENSOR

    PC702

    STAGE1

    STAGE2

    BOILER#2

    BOILER#1

    DHWDEMAND

    WIRING NEEDED ONLY IFPRIORITY ZONE IS DHW

    SR501-EXP and PC705 Variable Speed Pump Injection Control Connectedto an Existing Switching Relay

    FOUR ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY

    ZONE 4

    ONOFF

    PRIORITY

    120V RELAY

    120 VOLT CIRCULATORSZC ZR

    X XEND

    SWITCHPOWERINPUT

    120 VACINPUT

    ZONE1 ZONE2

    ZONE3

    ZONE4

    ZONE1 ZONE2 ZONE3 ZONE4

    FUSE 1 AMP

    24 V

    ACPO

    WER

    SR 504

    ZONE 2

    POWERZONE 1

    ZONE 3ZONE 4

    THERMOSTATS

    BOILER

    H

    N

    EXISTINGZONECONTROL

    T

    TO: "TT" ON BOILER

    SLAVE

    MASTER

    SWITCH SETTINGSMaster/Slave: MasterReset/Normal: Reset

    POWER

    ZONE 1

    LEDINDICATORS

    FUSE6 AMP

    FUSE6 AMP

    SR 501-EXP-4

    POWERCONTROLS

    SLAVE

    PRIORITY ONRESET

    PRIMARY PUMP ON

    POST PURGE ONPRIORITY PROTECT ON

    PUMP EXERCISE ON

    30 SEC/2 WK

    MASTER

    OFF

    OFF

    OFFOFFOFF

    NORMAL

    4 MIN/24 HOUR

    ACCESSORYPORT

    HN/O N H120 VAC

    CIRCULATORPRIMARYOUTPUT

    N/CINPUT

    120 VAC

    ENDSWITCH

    RESETOVERRIDETHERMOSTATEXPANSION

    X WRX 1A 2CB24 VOLTS AC ONLY

    C

    SINGLE ZONEEXPANDABLE SWITCHING RELAY

    INDIRECTWATER HEATERAQUASTAT ORTHERMOSTAT

    ZONECONTROL

    BOILSEN

    OUTSEN

    BOILER SENSOR

    OUTDOORSENSOR

    PC705-2

    SUPSEN

    SUPPLY SENSOR

    INJECTIONCIRCULATOR

    SYSTEMCIRCULATOR

    BLACK

    BLUE

    RED

    GREEN/GROUND

    (SEE NOTE BON PAGE 22)

    PRIMARYSYSTEM

    CIRCULATOR(Optional)

    Note: If Zone Control comes on without a call for heat,reverse Reset Override input (1 & 2) wires on SR501-EXP.

    JUMPER

  • ZONE

    CONT

    ROL

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    E 2

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    XX

    XX

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    C1

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    END

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    ITC

    HTH

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    THER

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    XX

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    END

    SW

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    HTH

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    N/C

    PRIM

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    120

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    ZRH

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    HN

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    LED

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    ICAT

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    con

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    22

  • 23

    PC700 Boiler Reset Control Connected to 2 EXP Switching Relays

    ZONECONTROL

    BOILSEN

    OUTSEN

    BOILER SENSOR

    OUTDOORSENSOR

    PC700

    BOILER

    120 VAC INPUT

    SWITCH SETTINGSMaster/Slave: MasterPriority Zone: On or OffReset/Normal: Reset

    FOUR ZONEEXPANDABLE

    SWITCHING RELAY

    POWERCONTROLS

    120 VAC CIRCULATORSZC

    INPUT120 VAC

    ZONE 1

    ZONE 2 ZONE 3 ZONE 4

    ZONE1 ZONE2 ZONE3

    THERMOSTATS

    SR 504-EXP-4

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    NETEXPANSIONMAIN PRIORITY

    X X X X A B C R W C R W C R W C R W C 1 2

    END SWITCH THERMOSTATS (24 VAC)

    PRIORITY N/CPRIMARY

    120 VACZR

    H H N H N H N H N H N H N H N H

    SLAVE

    PRIORITY ON

    RESET

    PRIMARY PUMP ON

    POST PURGE ONPRIORITY PROTECT ON

    PUMP EXERCISE ON

    30 SEC/2 WK

    MASTER

    OFF

    OFF

    OFFOFFOFF

    NORMAL

    LOW LIMIT (ZC) ON OFF4 MIN/24 HOUR

    ZONE4 ZONE4

    PRIORITY

    ACCESSORYPORT

    ZONE 2

    POWER

    ZONE 1

    ZONE 3

    ZONE 4

    LEDINDICATORS

    T

    PRIMARY SYSTEMCIRCULATOR(OPTIONAL)

    120 VAC INPUT

    SWITCH SETTINGSMaster/Slave: SlavePriority Zone: OffReset/Normal: Normal

    FOUR ZONEEXPANDABLE

    SWITCHING RELAY

    POWERCONTROLS

    120 VAC CIRCULATORSZC

    INPUT120 VAC

    ZONE 1

    ZONE 2 ZONE 3 ZONE 4

    ZONE1 ZONE2 ZONE3

    THERMOSTATS

    SR 504-EXP-4

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    NETEXPANSIONMAIN PRIORITY

    X X X X A B C R W C R W C R W C R W C 1 2

    END SWITCH THERMOSTATS (24 VAC)

    PRIORITY N/CPRIMARY

    120 VACZR

    H H N H N H N H N H N H N H N H

    SLAVE

    PRIORITY ON

    RESET

    PRIMARY PUMP ON

    POST PURGE ONPRIORITY PROTECT ON

    PUMP EXERCISE ON

    30 SEC/2 WK

    MASTER

    OFF

    OFF

    OFFOFFOFF

    NORMAL

    LOW LIMIT (ZC) ON OFF4 MIN/24 HOUR

    ZONE4 ZONE4

    PRIORITY

    ACCESSORYPORT

    ZONE 2

    POWER

    ZONE 1

    ZONE 3

    ZONE 4

    LEDINDICATORS

    T

    H

    N

    MASTER

    SLAVE

    See NOTE 1

    NOTE 1: Terminals C are foroptional 24V thermostatCOMMON connections.

    See NOTE 1

  • PC702 2–Stage Boiler Reset Control Connected to 2 EXP Switching Relays

    120 VAC INPUT

    SWITCH SETTINGSMaster/Slave: MasterPriority Zone: On or OffReset/Normal: Reset

    FOUR ZONEEXPANDABLE

    SWITCHING RELAY

    POWERCONTROLS

    120 VAC CIRCULATORSZC

    INPUT120 VAC

    ZONE 1

    ZONE 2 ZONE 3 ZONE 4

    ZONE1 ZONE2 ZONE3

    THERMOSTATS

    SR 504-EXP-4

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    NETEXPANSIONMAIN PRIORITY

    X X X X A B C R W C R W C R W C R W C 1 2

    END SWITCH THERMOSTATS (24 VAC)

    PRIORITY N/CPRIMARY

    120 VACZR

    H H N H N H N H N H N H N H N H

    SLAVE

    PRIORITY ON

    RESET

    PRIMARY PUMP ON

    POST PURGE ONPRIORITY PROTECT ON

    PUMP EXERCISE ON

    30 SEC/2 WK

    MASTER

    OFF

    OFF

    OFFOFFOFF

    NORMAL

    LOW LIMIT (ZC) ON OFF4 MIN/24 HOUR

    ZONE4 ZONE4

    PRIORITY

    ACCESSORYPORT

    ZONE 2

    POWER

    ZONE 1

    ZONE 3

    ZONE 4

    LEDINDICATORS

    T

    120 VAC INPUT

    SWITCH SETTINGSMaster/Slave: SlavePriority Zone: OffReset/Normal: Normal

    FOUR ZONEEXPANDABLE

    SWITCHING RELAY

    POWERCONTROLS

    120 VAC CIRCULATORSZC

    INPUT120 VAC

    ZONE 1

    ZONE 2 ZONE 3 ZONE 4

    ZONE1 ZONE2 ZONE3

    THERMOSTATS

    SR 504-EXP-4

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    NETEXPANSIONMAIN PRIORITY

    X X X X A B C R W C R W C R W C R W C 1 2

    END SWITCH THERMOSTATS (24 VAC)

    PRIORITY N/CPRIMARY

    120 VACZR

    H H N H N H N H N H N H N H N H

    SLAVE

    PRIORITY ON

    RESET

    PRIMARY PUMP ON

    POST PURGE ONPRIORITY PROTECT ON

    PUMP EXERCISE ON

    30 SEC/2 WK

    MASTER

    OFF

    OFF

    OFFOFFOFF

    NORMAL

    LOW LIMIT (ZC) ON OFF4 MIN/24 HOUR

    ZONE4 ZONE4

    PRIORITY

    ACCESSORYPORT

    ZONE 2

    POWER

    ZONE 1

    ZONE 3

    ZONE 4

    LEDINDICATORS

    T

    H

    N

    MASTER

    SLAVE

    ZONECONTROL

    BOILSEN

    OUTSEN

    BOILER SENSOR

    OUTDOORSENSOR

    PC702

    STAGE1

    STAGE2

    BOILER#2

    BOILER#1

    DHWDEMAND

    WIRING NEEDED ONLY IFPRIORITY ZONE IS DHW

    PRIMARY SYSTEMCIRCULATOR(OPTIONAL)

    See NOTE 1

    NOTE 1: Terminals C are foroptional 24V thermostatCOMMON connections.

    See NOTE 1

    24

  • 25

    PC705 Variable Speed Pump Injection Control Connected to 2 EXP Switching Relays

    120 VAC INPUT

    SWITCH SETTINGSMaster/Slave: MasterPriority Zone: On or OffReset/Normal: Reset

    FOUR ZONEEXPANDABLE

    SWITCHING RELAY

    POWERCONTROLS

    120 VAC CIRCULATORSZC

    INPUT120 VAC

    ZONE 1

    ZONE 2 ZONE 3 ZONE 4

    ZONE1 ZONE2 ZONE3

    THERMOSTATS

    SR 504-EXP-4

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    NETEXPANSIONMAIN PRIORITY

    X X X X A B C R W C R W C R W C R W C 1 2

    END SWITCH THERMOSTATS (24 VAC)

    PRIORITY N/CPRIMARY

    120 VACZR

    H H N H N H N H N H N H N H N H

    SLAVE

    PRIORITY ON

    RESET

    PRIMARY PUMP ON

    POST PURGE ONPRIORITY PROTECT ON

    PUMP EXERCISE ON

    30 SEC/2 WK

    MASTER

    OFF

    OFF

    OFFOFFOFF

    NORMAL

    LOW LIMIT (ZC) ON OFF4 MIN/24 HOUR

    ZONE4 ZONE4

    PRIORITY

    ACCESSORYPORT

    ZONE 2

    POWER

    ZONE 1

    ZONE 3

    ZONE 4

    LEDINDICATORS

    T

    120 VAC INPUT

    SWITCH SETTINGSMaster/Slave: SlavePriority Zone: OffReset/Normal: Normal

    FOUR ZONEEXPANDABLE

    SWITCHING RELAY

    POWERCONTROLS

    120 VAC CIRCULATORSZC

    INPUT120 VAC

    ZONE 1

    ZONE 2 ZONE 3 ZONE 4

    ZONE1 ZONE2 ZONE3

    THERMOSTATS

    SR 504-EXP-4

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    NETEXPANSIONMAIN PRIORITY

    X X X X A B C R W C R W C R W C R W C 1 2

    END SWITCH THERMOSTATS (24 VAC)

    PRIORITY N/CPRIMARY

    120 VACZR

    H H N H N H N H N H N H N H N H

    SLAVE

    PRIORITY ON

    RESET

    PRIMARY PUMP ON

    POST PURGE ONPRIORITY PROTECT ON

    PUMP EXERCISE ON

    30 SEC/2 WK

    MASTER

    OFF

    OFF

    OFFOFFOFF

    NORMAL

    LOW LIMIT (ZC) ON OFF4 MIN/24 HOUR

    ZONE4 ZONE4

    PRIORITY

    ACCESSORYPORT

    ZONE 2

    POWER

    ZONE 1

    ZONE 3

    ZONE 4

    LEDINDICATORS

    T

    H

    N

    MASTER

    SLAVE

    TO: "TT" ON BOILER

    BOILER

    ZONECONTROL

    BOILSEN

    OUTSEN

    BOILER SENSOR

    OUTDOORSENSOR

    PC705-2

    SUPSEN

    SUPPLY SENSOR

    INJECTIONCIRCULATOR

    SYSTEMCIRCULATOR

    BLACK

    BLUE

    RED

    GREEN/GROUND

    (SEE NOTE BON PAGE 22)

    (SEE NOTE AON PAGE 22)

    PRIMARY SYSTEMCIRCULATOR(OPTIONAL)

    See NOTE 1

    NOTE 1: Terminals C are foroptional 24V thermostatCOMMON connections.

    See NOTE 1

  • PC700 and PC705 Controls Connected to 2 EXP Switching Relays

    120 VAC INPUT

    SWITCH SETTINGSMaster/Slave: MasterPriority Zone: On or OffReset/Normal: Reset

    FOUR ZONEEXPANDABLE

    SWITCHING RELAY

    POWERCONTROLS

    120 VAC CIRCULATORSZC

    INPUT120 VAC

    ZONE 1

    ZONE 2 ZONE 3 ZONE 4

    ZONE1 ZONE2 ZONE3

    THERMOSTATS

    SR 504-EXP-4

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    NETEXPANSIONMAIN PRIORITY

    X X X X A B C R W C R W C R W C R W C 1 2

    END SWITCH THERMOSTATS (24 VAC)

    PRIORITY N/CPRIMARY

    120 VACZR

    H H N H N H N H N H N H N H N H

    SLAVE

    PRIORITY ON

    RESET

    PRIMARY PUMP ON

    POST PURGE ONPRIORITY PROTECT ON

    PUMP EXERCISE ON

    30 SEC/2 WK

    MASTER

    OFF

    OFF

    OFFOFFOFF

    NORMAL

    LOW LIMIT (ZC) ON OFF4 MIN/24 HOUR

    ZONE4 ZONE4

    PRIORITY

    ACCESSORYPORT

    ZONE 2

    POWER

    ZONE 1

    ZONE 3

    ZONE 4

    LEDINDICATORS

    T

    120 VAC INPUT

    SWITCH SETTINGSMaster/Slave: SlavePriority Zone: OffReset/Normal: Reset

    FOUR ZONEEXPANDABLE

    SWITCHING RELAY

    POWERCONTROLS

    120 VAC CIRCULATORSZC

    INPUT120 VAC

    ZONE 1

    ZONE 2 ZONE 3 ZONE 4

    ZONE1 ZONE2 ZONE3

    THERMOSTATS

    SR 504-EXP-4

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    NETEXPANSIONMAIN PRIORITY

    X X X X A B C R W C R W C R W C R W C 1 2

    END SWITCH THERMOSTATS (24 VAC)

    PRIORITY N/CPRIMARY

    120 VACZR

    H H N H N H N H N H N H N H N H

    SLAVE

    PRIORITY ON

    RESET

    PRIMARY PUMP ON

    POST PURGE ONPRIORITY PROTECT ON

    PUMP EXERCISE ON

    30 SEC/2 WK

    MASTER

    OFF

    OFF

    OFFOFFOFF

    NORMAL

    LOW LIMIT (ZC) ON OFF4 MIN/24 HOUR

    ZONE4 ZONE4

    PRIORITY

    ACCESSORYPORT

    ZONE 2

    POWER

    ZONE 1

    ZONE 3

    ZONE 4

    LEDINDICATORS

    T

    H

    N

    MASTER

    SLAVE

    TO: "TT" ON BOILER

    BOILER

    ZONECONTROL

    BOILSEN

    OUTSEN

    BOILER SENSOR

    OUTDOORSENSOR

    PC705-2

    SUPSEN

    SUPPLY SENSOR

    INJECTIONCIRCULATOR

    SYSTEMCIRCULATOR

    BLACK

    BLUE

    RED

    GREEN/GROUND

    (SEE NOTE BON PAGE 22)

    ZONECONTROL

    BOILSEN

    OUTSEN

    BOILER SENSOR

    OUTDOORSENSOR

    PC700

    (SEE NOTE AON PAGE 22)

    PRIMARY SYSTEMCIRCULATOR(OPTIONAL)

    See NOTE 1

    NOTE 1: Terminals C are foroptional 24V thermostatCOMMON connections.

    See NOTE 1

    26

  • 27

    PC702 and PC705 Controls Connected to 2 EXP Switching Relays

    120 VAC INPUT

    SWITCH SETTINGSMaster/Slave: MasterPriority Zone: On or OffReset/Normal: Reset

    FOUR ZONEEXPANDABLE

    SWITCHING RELAY

    POWERCONTROLS

    120 VAC CIRCULATORSZC

    INPUT120 VAC

    ZONE 1

    ZONE 2 ZONE 3 ZONE 4

    ZONE1 ZONE2 ZONE3

    THERMOSTATS

    SR 504-EXP-4

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    NETEXPANSIONMAIN PRIORITY

    X X X X A B C R W C R W C R W C R W C 1 2

    END SWITCH THERMOSTATS (24 VAC)

    PRIORITY N/CPRIMARY

    120 VACZR

    H H N H N H N H N H N H N H N H

    SLAVE

    PRIORITY ON

    RESET

    PRIMARY PUMP ON

    POST PURGE ONPRIORITY PROTECT ON

    PUMP EXERCISE ON

    30 SEC/2 WK

    MASTER

    OFF

    OFF

    OFFOFFOFF

    NORMAL

    LOW LIMIT (ZC) ON OFF4 MIN/24 HOUR

    ZONE4 ZONE4

    PRIORITY

    ACCESSORYPORT

    ZONE 2

    POWER

    ZONE 1

    ZONE 3

    ZONE 4

    LEDINDICATORS

    T

    SWITCH SETTINGSMaster/Slave: SlavePriority Zone: OffReset/Normal: Reset

    FOUR ZONEEXPANDABLE

    SWITCHING RELAY

    POWERCONTROLS

    120 VAC CIRCULATORSZC

    INPUT120 VAC

    ZONE 1

    ZONE 2 ZONE 3 ZONE 4

    ZONE1 ZONE2 ZONE3

    THERMOSTATS

    SR 504-EXP-4

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    FUSE6 AMP

    NETEXPANSIONMAIN PRIORITY

    X X X X A B C R W C R W C R W C R W C 1 2

    END SWITCH THERMOSTATS (24 VAC)

    PRIORITY N/CPRIMARY

    120 VACZR

    H H N H N H N H N H N H N H N H

    SLAVE

    PRIORITY ON

    RESET

    PRIMARY PUMP ON

    POST PURGE ONPRIORITY PROTECT ON

    PUMP EXERCISE ON

    30 SEC/2 WK

    MASTER

    OFF

    OFF

    OFFOFFOFF

    NORMAL

    LOW LIMIT (ZC) ON OFF4 MIN/24 HOUR

    ZONE4 ZONE4

    PRIORITY

    ACCESSORYPORT

    ZONE 2

    POWER

    ZONE 1

    ZONE 3

    ZONE 4

    LEDINDICATORS

    MASTER

    SLAVE

    ZONECONTROL

    BOILSEN

    OUTSEN

    BOILER SENSOR

    OUTDOORSENSOR

    PC702

    STAGE1

    STAGE2

    BOILER#2

    BOILER#1

    DHWDEMAND

    WIRING NEEDED ONLY IFPRIORITY ZONE IS DHW

    120 VAC INPUTH

    N

    ZONECONTROL

    BOILSEN

    OUTSEN

    BOILER SENSOR

    OUTDOORSENSOR

    PC705-2

    SUPSEN

    SUPPLY SENSOR

    INJECTIONCIRCULATOR

    SYSTEMCIRCULATOR

    BLACK

    BLUE

    RED

    GREEN/GROUND

    (SEE NOTE BON PAGE 22)

    T

    PRIMARY SYSTEMCIRCULATOR(OPTIONAL)

    See NOTE 1

    NOTE 1: Terminals C are foroptional 24V thermostatCOMMON connections.

    See NOTE 1

  • 28

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    FACTORYINSTALLED

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    T ST

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    T ST

    AT 4

    VALV

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    VALV

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    FACTORYINSTALLED

    TRANSFORMER

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