Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.PC 111 Catalog No. 533-80099 Printed in U.S.A. Form 38/48/50-21SI Pg 1 6-03 Replaces: 38/48/50-13SIBook 1 1 1 1 4 4 4 4

Tab 1a 1b 3a 5a 2a 5a 6a 6b

Installation InstructionsPart Numbers: 32LT900301, 32LT900611

PACKAGE CONTENTS

NOTE: The 32LT900301 Motormaster I device is rated at 8 amps, and the 32LT900611Motormaster I device is rated at 4 amps.

GENERALMotormaster I solid-state head pressure control regulates

fan speed. A temperature sensor, mounted on a return bend ofthe condenser (outdoor) coil, activates the device. The Motor-master I controller controls the speed of approved condenser(outdoor) fan motors in order to maintain a constant head pres-sure in the condenser (outdoor) coil. When properly installed,the control will maintain the appropriate head pressure at lowambient temperatures down to 20 F. Usage is shown inTable 1.

INSTALLATION1. Disconnect power to the unit.2. Disconnect condenser (outdoor) fan motor (OFM) wires

at the contactor and capacitor. Note position of fan bladesin relation to fan orifice.NOTE: 38ARD012, 38ARQ008-012, 38ARS008-12,and 38ARZ007-012 units require 2 OFMs.

3. Remove OFM(s) from the unit (except 38AKS013-024,38ARD014-024, and 38AQS012-016 units with voltages220-3-50, 208/230-3-60, 400-3-50, and 460-3-60).

4. Remove fan blade(s) from motor(s).5. Mount Motormaster I controller on the unit. See Fig. 1.

The controller must be mounted vertically with leads atthe bottom. Using the template supplied with the control-ler, drill 4 mounting holes. To ensure electrical ground,insert star lockwashers (supplied with the controller) un-der the heads of the sheet metal screws.For 38ARD,ARQ,ARZ007-012 units, a field-fabricatedmounting bracket is required (2 for 38ARD012 units).See Fig. 2. The bracket is mounted under the unit controlbox. Mounting holes are provided in the unit basepan.

Table 1 Motormaster I Controller Usage

*A capacitor (P/N HC91CA010) and strap (P/N HC98ZZ071) are required for single-phase, 48/50HJ006 and 50HJQ006 and 3-phase 48/50TF,TJ,TM004-006 and 50TFQ,TJQ004-006 units. Acapacitor (P/N HC98KA048) and strap (P/N 317739-303) are required for single-phase 48/50TF,TM,TJ004-006 and 50TJQ004-006 units.

Field-fabricated bracket required for mounting.**HT01AH852 transformer is required.

ITEM QUANTITYMotormaster I Controller 1No. 10 Sheet Metal Screws 4Star Lockwashers 43/4-in. Lg, 4-40 Screws 2Plate Washers 24-40 Nuts 2Wirenuts 2Sensor Assembly 1

UNIT VOLTAGE MOTOR PART NO. MOTORMASTER I PART NO.

48/50HJ004,005and 50HJQ004,005

220-1-50HC38GE231 32LT900301220-3-50208/230-1-60

208/230-3-60400-3-50

HC36GE461 32LT900611460-3-60575-3-60

48/50HJ006-014*;50HJQ006-012*;

48/50TF004-014*, 50TFQ004-012*;48/50TJ004-014*;

50TJQ004-012*; and48/50TM004-014*

220-1-50HC40GE233

(1 or 2 required) 32LT900301 (1 required)220-3-50208/230-1-60208/230-3-60

400-3-50 HC40GE463(1 or 2 required) 32LT900611 (2 required)460-3-60575-3-60

38AK007208/230-1-60

HC42GE230 32LT900301208/230-3-60575-3-60460-3-60 HC42GE460 32LT900611

38ARD012208/230-3-60 HC40GE233 (2 required) 32LT900301 (2 required)

575-3-60 HC40GE463 (2 required) 32LT900611 (2 required)400-3-50 HC40GE463 (2 required) 32LT900611 (2 required)460-3-60

38ARS008-012208/230-3-60 HC40GE233 (2 required) 32LT900301

575-3-60 HC40GE463 (2 required) 32LT900611400-3-50 HC40GE463 (2 required) 32LT900611460-3-60

38ARQ008-012 208/230-3-60 HC40GE233 (2 required) 32LT900301460-3-60 HC40GE463 (2 required) 32LT900611

38ARZ007208/230-3-60 HC38GE231 (2 required) 32LT900301

575-3-60 HC36GE461 (2 required) 32LT900611400-3-50 HC36GE461 (2 required) 32LT900611460-3-60

38ARZ008-012208/230-3-60 HC40GE233 (2 required) 32LT900301

575-3-60 HC40GE463 (2 required) 32LT900611400-3-50 HC40GE463 (2 required) 32LT900611460-3-60

38AKS013-02438ARD014-02438AQS012-016

208/230-3-60220-3-50 Motor change not required 32LT900301460-3-60400-3-50 Motor change not required 32LT900611

575-3-60** HC44VL852 32LT900301

38AK007, 38AKS013-024, 38ARD012-024, 38ARS008-01238ARQ008-012, 38ARZ007-012, 38AQS012-016

48/50HJ,TF,TJ,TM004-01450HJQ,TFQ,TJQ004-012

Accessory Motormaster I Head Pressure Controller50/60 Hz

26. Route sensor wire from bottom of Motormaster I control tosensor location as specified in Fig. 3-7. Fasten sensor with3/4-in. 4-40 screws, plate washers, and 4-40 nuts provided.

7. Replace the OFM(s), if required, with the motor(s) shownin Table 1. Rewire the motor connections as shown inFig. 8-21. Two wirenuts are included in package, if needed.NOTE: A capacitor is needed on 48/50HJ006 and50HJQ006 single-phase units; 48/50TF,TJ004-006 units;and 50TJQ004-006 units.On single-phase 48/50HJ006 and 50HJQ006 units, use thecapacitor (HC91CA010) as an additional capacitor in par-allel. Use the capacitor strap to hold the capacitor in place.On single-phase and 3-phase 50TFQ,TJQ004-006 and48/50TF,TM,TJ004-006 units, replace the capacitor with

a field-supplied capacitor (HC98KA048, HC91CA010respectively). Use the capacitor strap to hold the capacitorin place.

8. Coil up all excess wire and secure it next to the controller.9. Winter start control is required on all units except

condensing unit heat pumps. On units equipped with alow-pressure switch on the suction line, disconnectlow-pressure switch and replace it with Carrier partno. HK02ZB038. Locate the new switch on the accessport located on the liquid line (small rooftop units only).

10. Wind baffles are required to prevent wind cross currentsfrom causing abnormally low condensing temperatures.Fabricate sheet metal baffles as shown in Fig. 22-25. Use20-gage sheet metal.

11. Re-install fan blade. Ensure that fan blade is properly lo-cated in the orifice. Refer to the base unit installation in-structions for further details.

12. Reconnect power to the unit.

Sensor assembly is delicate. Handle with care.

MOTORMASTER ICONTROLLER

MOTORMASTER ICONTROLLER (38ARD012 ONLY)

CONDENSERCOIL

COMPRESSORCONDENSERCOIL

-

--

-

Fig. 1 Motormaster I Controller Location

38AK007 UNITS

48TJ004-007 UNITS

48HJ,TF,TJ008-014 UNITSNOTE: Field-fabricated bracket required for Motormaster I controller mounting.

38ARD012, 38ARS008-012, 38ARQ008-012 AND 38ARZ007-012 UNITS

38AKS013-024, 38ARD014-024, 38AQS012-016 UNITS

3Fig. 1 Motormaster I Controller Location (cont)

50TJ004-007 UNITS WITHOUT SINGLE POINT BOX

50TJ004-007 UNITS WITH SINGLE POINT BOX

50HJ,HJQ,TF,TFQ,TJ,TJQ008-014 UNITS WITHOUT SINGLE POINT BOX

50HJ,HJQ,TF,TFQ,TJ,TJQ008-014 UNITS WITH SINGLE POINT BOX

48HJ,TF,TM004-007 UNITS

48HJ,TF,TM008-014 UNITS

4Fig. 1 Motormaster I Controller Location (cont)

Fig. 2 Field-Fabricated Mounting Bracket (38ARD,ARQ,ARZ007-012 Units Only)

50HJ,HJQ,TF,TFQ,TM004-007 UNITS WITHOUT SINGLE POINT BOX

50HJ,HJQ,TF,TFQ,TM004-007 UNITS WITH SINGLE POINT BOX

50TM008-014 UNITS WITHOUT SINGLE POINT BOX

50TM008-014 UNITS WITH SINGLE POINT BOX

NOTE: Dimensions are in millimeters.

5SEE DETAIL B

DETAIL B

LOCATION FORMOTORMASTERSENSOR

SEE DETAIL A

DETAIL A

LOCATION FORMOTORMASTERSENSOR

Fig. 3 Motormaster I Sensor Mounting Location 38AK,AKS Units

Fig. 4 Motormaster I Sensor Mounting Locations 38AR Units

HEADER END38AK007

RETURN BENDEND

38ARZ007 UNITNOTE: Route and bundle Motormaster wires with control box harness assembly.

38ARQ008, 38ARZ008 AND 38ARS008 UNITS

SENSOR LOCATIONON HAIRPIN/RETURN

BEND(7th FROM TOP)

SIZE 013SIZES 014-024 TOP OF COIL

HEADER END COIL HAIRPIN END

38AKS013-024

6LOCATION FORMOTORMASTERSENSOR

DETAIL C

DETAIL D

LOCATION FORSECONDMOTORMASTERSENSOR (FOR38ARD012 ONLY)

SEE DETAIL D

SEE DETAIL C

Fig. 4 Motormaster I Sensor Mounting Locations 38AR Units (cont)

38ARZ012, 38ARQ012, 38ARS009,012 AND 38ARD012 UNITSNOTE: 38ARD012 requires (2) Motormaster sensors. Use both locations in detail C and D.

38ARD014-024 UNITS

7Fig. 5 Motormaster I Sensor Mounting Locations 38AQS012,016 Units

48/50HJ004 48/50TJ004Fig. 6 Motormaster I Sensor Mounting Locations 48/50HJ,TF,TJ,TM Units

SENSORLOCATION

48/50TF,TM004

8SENSORLOCATION

48/50HJ005 48/50TF,TM005 48/50TJ005

SENSORLOCATION

48/50TF,TM00648/50HJ006 48/50TJ006Fig. 6 Motormaster I Sensor Mounting Locations 48/50HJ,TF,TJ,TM Units (cont)

9SENSORLOCATION

48/50HJ007 (units with serial numbers lower than 0702G);

48/50TM007

48/50TF007

SENSORLOCATION

48/50TJ007 48/50HJ007 (units with serial numbers 0702G and higher)

Fig. 6 Motormaster I Sensor Mounting Locations 48/50HJ,TF,TJ,TM Units (cont)

10

48/50TF,TJ00848/50HJ,TM008

SENSOR

48/50TF,TJ,TM00948/50HJ009 (units with serial numbers lower than 0903G)Fig. 6 Motormaster I Sensor Mounting Locations 48/50HJ,TF,TJ,TM Units (cont)

11

SENSOR

48/50TF,TJ,TM01248/50HJ009 (units with serial numbers 0903G and higher);48/50HJ012

48/50HJ,TF,TJ,TM014

Fig. 6 Motormaster I Sensor Mounting Locations 48/50HJ,TF,TJ,TM Units (cont)

12

SENSOR

SENSOR

50HJQ004 50TFQ004 AND 50TJQ004

SENSOR

SENSOR

Fig. 7 Motormaster I Sensor Mounting Locations 50HJQ,TFQ,TJQ Units50HJQ005 50TFQ005 AND 50TJQ005

13

SENSOR

SENSOR

50TFQ006 AND 50TJQ00650HJQ006

SENSOR

SENSORLOCATION

SENSOR

50HJQ007 (with serial numbers lower than 0902G)

50HJQ007 (with serial numbers 0902G and higher)

50TFQ007 AND 50TJQ007

Fig. 7 Motormaster I Sensor Mounting Locations 50HJQ,TFQ,TJQ Units (cont)

14

SENSOR

SENSOR

50HJQ008 50TFQ008 AND 50TJQ008

SENSOR

50TFQ009 AND 50TJQ009

SENSOR

50HJQ012

SENSOR

50TFQ012 AND 50TJQ012

Fig. 7 Motormaster I Sensor Mounting Locations 50HJQ,TFQ,TJQ Units (cont)

15

MOTORMASTER

SENSOR

REDBL

U

Fig. 8 Wiring Details(38AK007 and 48/50HJ,TF,TJ,TM004-007 Units)

Fig. 9 Wiring Details(38ARZ007-012 Units)

LEGENDC ContactorCAP CapacitorCLO Compressor LockoutCOMP CompressorOFM Outdoor Fan Motor

MOTORMASTER

SENSOR

REDBL

U

Fig. 10 Wiring Details(38ARS008-012 Units)

LEGENDC ContactorCAP CapacitorCOMP CompressorOFM Outdoor Fan MotorOL Overload

*Use control part no. 32LT900301 for all unit voltages except 400 Vand 460 V. Use control part no. 32LT900611 for 400 V and 460 Vunits.

Fig. 11 Wiring Details (38AKS013-024 Units Except 575-V)

Fig. 12 Wiring Details (38AKS013-024 Units 575-V)

*Use control part no. 32LT900301 for all unit voltages except 400 Vand 460 V. Use control part no. 32LT900611 for 400 V and 460 Vunits.

Fig. 13 Wiring Details (38AQS012-016 Units Except 575-V)

Fig. 14 Wiring Details (38AQS012-016 Units 575-V)

16

W1 W2 ORN

ORN

ORN HR

RVR2

TRAN2CR3RVR2

RVR3

HRTB2C

WHT

RVR1WHT

3

3

3

33

3

3

CWHTWHT

WHT

WHTWHT

1

1

1

RVR3

R

ORN ORNRVR1

ORN

ORN

Fig. 15 Isolation Relay Wiring Details (38AQS012-016 with Isolation Relay)

NOTE: Isolation Relay (R) (field supplied) HN61KQ120 orequivalent.

MOTORMASTER

Fig. 16 Wiring Details (38ARD014-024 Units)

LEGENDC ContactorCAP CapacitorCH Crankcase HeaterCLO Compressor LockoutCOMP CompressorOFM Outdoor-Fan MotorOFR Outdoor-Fan RelayQT Quadruple Terminal

17

MOTORMASTER

SENSOR

REDBL

U

(MOTORMASTERCONTROL NO. 1)

MOTORMASTER

SENSOR

REDBL

U

(MOTORMASTERCONTROL NO. 2)

MOTORMASTER

SENSOR

REDBL

U

Fig. 17 Wiring Details(38ARD012 Units)

Fig. 18 Wiring Details(38ARQ Units)

LEGENDC ContactorCAP CapacitorCH Crankcase HeaterCLO Compressor LockoutCOMP CompressorOFM Outdoor-Fan Motor

NOTE: Two Motormastercontrols are required on38ARD012 units.

LEGENDC ContactorCAP CapacitorCH Crankcase HeaterCLO Compressor LockoutCOMP CompressorMMR Motormaster RelayOFM Outdoor-Fan Motor

Fig. 19 Wiring Details(50HJQ,TFQ,TJQ004-007 Units)

Fig. 20 Wiring Details(48/50HJ,TF,TJ,TM008-014 Units)

CYEL

MOTORMASTER

SENSOR

BLK BLK

WHT

BRN

BLURED

R

CRVS

O

2313

BLKBLK

TO OFC ONDEFROSTBOARD

LEGENDC ContactorOFC Outdoor-Fan ContactorR RelayRVS Reversing Valve Solenoid

NOTE: R HN61KJ250 (normally closed contacts)

LEGENDC Contactor

RED

CYEL

MOTORMASTER

SENSOR

BLK BLK

WHT

BRN

BLK

WHT

BRN

BLURED

R

CRVS

O

Fig. 21 Wiring Details(50HJQ,TFQ,TJQ008-012 Units)

LEGENDC ContactorR RelayRVS Reversing Valve Solenoid

18

Fig. 22 Wind Baffle Mounting Details, 38AK,ARD,ARQ,ARS,ARZ007-012 Units

NOTE: Dimensions in ( ) are millimeters.DIMENSIONS (in.)

LEFT BAFFLE

REAR BAFFLE

FRONT BAFFLE

RIGHT BAFFLE

UNIT38AK A B C D E F G H

007 291/4 303/16 31 27 2 10 18 26

UNIT38ARZ/S/D/Q A B C D E F G H

007-012 22 223/4 231/4 27 21/4 91/4 161/4 231/4

UNIT38AK A B C D E F G H

007 361/2 373/8 381/4 27 2 10 18 26

UNIT38ARZ/S/D/Q A B C D E F G H

007-012 30 31 32 27 21/4 91/4 161/4 231/4

UNIT38ARZ/S/D/Q A B C D E F G H

007-012 25 26 27 27 21/4 91/4 161/4 231/4

UNIT38ARZ/S/D/Q A B C D E F G H

007-012 301/2 311/2 321/2 27 21/4 91/4 161/4 231/4

DIMENSIONS (mm)LEFT BAFFLE

REAR BAFFLE

FRONT BAFFLE

RIGHT BAFFLE

UNIT38AK A B C D E F G H

007 743 767 787 686 51 254 457 660

UNIT38ARZ/S/D/Q A B C D E F G H

007-012 559 578 591 686 57 235 413 591

UNIT38AK A B C D E F G H

007 927 949 972 686 51 254 457 660

UNIT38ARZ/S/D/Q A B C D E F G H

007-012 762 787 813 686 57 235 413 591

UNIT38ARZ/S/D/Q A B C D E F G H

007-012 635 660 686 686 57 235 413 591

UNIT38ARZ/S/D/Q A B C D E F G H

007-012 775 800 826 686 57 235 413 591

19

DIMENSIONS (ft-in.)

*As viewed from access panel side.

Fig. 23 Wind Baffle Mounting Details, 38AKS,ARD013-024 and 38AQS012-016 Units

BAFFLE LOCATIONS ARight-Hand Side* 2-511/16Back 5-81/2Left-Hand Side* 3-07/16

20

NOTE: Dimensions in ( ) are millimeters.DIMENSIONS (in.)

DIMENSIONS (mm)

Fig. 24 Wind Baffle Mounting Details, 48/50HJ,TF,TM,TJ004-007 and 50HJQ,TFQ,TJQ004-007 Units

UNIT FRONT BAFFLE SIDE BAFFLEA B C D E F G H A B C D E F G H48/50TF,TJ,TM004-007 4213/16 4313/16 4413/16 1921/32 315/16 77/8 1125/32 153/4 263/4 273/4 283/4 1921/32 315/16 77/8 1125/32 153/4

48/50HJ004-007and

50HJQ,TJQ004-007341/2 359/32 361/16 273/8 23/32 93/32 163/32 233/32 2213/16 2319/32 243/8 273/8 23/32 93/32 163/32 233/32

50TFQ004,005 211/2 221/4 23 273/8 13/32 93/32 173/32 253/32 253/32 253/4 265/32 273/8 45/16 115/16 185/16 255/1650TFQ006,007 317/8 325/8 337/16 273/8 13/32 93/32 173/32 253/32 253/32 253/4 265/32 273/8 45/16 115/16 185/16 255/16

UNIT FRONT BAFFLE SIDE BAFFLEA B C D E F G H A B C D E F G H48/50TF,TJ,TM004-007 1087 1113 1138 499 100 200 299 400 679 705 730 499 100 200 299 400

48/50HJ004-007and

50HJQ,TJQ004-007876 896 916 695 52.9 230.7 408.5 586.3 579 599 619 695 52.9 230.7 408.5 586.3

50TFQ004,005 546 565 584 695 28 231 434 637 637 654 664 691 110 287 465 64350TFQ006,007 810 829 849 695 28 231 434 637 637 654 664 691 110 287 465 643

21

NOTE: Dimensions in ( ) are millimeters.

SIDE BAFFLEDIMENSIONS (in.)

DIMENSIONS (mm)

FRONT BAFFLEDIMENSIONS (in.)

DIMENSIONS (mm)

Fig. 25 Wind Baffle Mounting Details, 48/50HJ,TF,TM,TJ008-014 and 50HJQ,TFQ,TJQ008-012 Units

UNIT A B C D E F G H J K48/50HJ,TF,TJ,TM008,009;

50HJQ008, 50TFQ,TJQ008,009 431/8 437/8 445/8 351/4 57/8 147/8 221/4 301/2 48/50HJ,TF,TJ,TM012,014; 50HJQ,TFQ,TJQ012 431/8 437/8 445/8 431/4 57/8 147/8 221/4 301/2 381/8

UNIT A B C D E F G H J K48/50HJ,TF,TJ,TM008,009;

50HJQ008, 50TFQ,TJQ008,009 1096.0 1115.0 1134.0 894.0 150.0 377.0 566.0 774.0 48/50HJ,TF,TJ,TM012,014; 50HJQ,TFQ,TJQ012 1096.0 1115.0 1134.0 1098.0 150.0 377.0 566.0 774.0 967.6

UNIT A B C D E F G H J K48/50HJ009; 48/50HJ,TF,TJ,TM008; 50HJQ,TFQ,TJQ008 415/8 423/8 431/8 351/4 11/4 91/4 171/4 251/4 331/4

48/50TJ,TM009; 50TJQ009 301/4 311/8 317/8 351/4 11/4 91/4 171/4 251/4 331/4 50TFQ009 165/8 173/8 181/8 351/4 11/4 91/4 171/4 251/4 331/4

48/50TF,TJ,TM012 151/2 161/4 171/8 431/4 11/4 91/4 171/4 251/4 331/4 411/450TJQ012 181/2 191/4 211/8 431/4 11/4 91/4 171/4 251/4 331/4 411/4

48/50HJ012,014; 48/50TF,TJ,TM014; 50HJQ,TFQ012 415/8 423/8 431/4 431/4 11/4 91/4 171/4 251/4 331/4 411/4

UNIT A B C D E F G H J K48/50HJ009; 48/50HJ,TF,TJ,TM008; 50HJQ,TFQ,TJQ008 1058.0 1077.0 1096.0 894.0 32.0 235.2 438.4 641.6 844.8

48/50TJ,TM009; 50TJQ009 796.0 789.0 809.0 894.0 32.0 235.2 438.4 641.6 844.8 50TFQ009 422.2 441.3 460.4 894.0 32.0 235.2 438.4 641.6 844.8

48/50TF,TJ,TM012 393.0 413.0 433.0 1098.0 32.0 235.2 438.4 641.6 844.8 1048.050TJQ012 469.2 489.2 509.2 1098.0 32.0 235.2 438.4 641.6 844.8 1048.0

48/50HJ012,014; 48/50TF,TJ,TM014; 50HJQ,TFQ012 1058.0 1077.0 1096.0 1098.0 32.0 235.2 438.4 641.6 844.8 1048.0

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.PC 111 Catalog No. 533-80099 Printed in U.S.A. Form 38/48/50-21SI Pg 22 6-03 Replaces: 38/48/50-13SI

Copyright 2003 Carrier Corporation

Book 1 1 1 1 4 4 4 4Tab 1a 1b 3a 5a 2a 5a 6a 6b

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.PC 111 Catalog No. 533-80099 Printed in U.S.A. Form 38/48/50-21SI Pg 24 6-03 Replaces: 38/48/50-13SI

Copyright 2003 Carrier Corporation

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ALO

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CUT

ALO

NG

DOT

TED

LIN

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Book 1 1 1 1 4 4 4 4Tab 1a 1b 3a 5a 2a 5a 6a 6b

CONTROLLER MOUNTING TEMPLATE