42 WHC/WHE

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IS O 9 00 1

INSTALLATION MANUAL

42 WHC/WHE“Hydronic Hi-Wall”

GB - 1

EN

GL

ISH

Contents

Page

General information .................................................................................... 2Warnings: avoid .......................................................................................... 3Dimensions and weight............................................................................... 4Nominal data ............................................................................................... 4Minimum clearances................................................................................... 5Material supplied ........................................................................................ 5Operating limits ........................................................................................... 5Hanging panel ............................................................................................. 6Installation panel ......................................................................................... 7Water connections ...................................................................................... 7Electrical connection .................................................................................. 8/9Printed circuit for unit without electric heaters ............................................ 8Printed circuit for unit with electric heaters ................................................. 9Electric heaters ........................................................................................... 10Technical data of electric heaters ............................................................... 10Wiring diagram............................................................................................ 11Room thermostat installation ...................................................................... 12Unit installation ........................................................................................... 13/14Thermo-electric control valve ..................................................................... 14Optimum comfort and lowest consumption ................................................ 15Correct cleaning.......................................................................................... 15Before a long shutdown period ................................................................... 15Troubleshooting .......................................................................................... 16Guide for the owner .................................................................................... 16Accessories ................................................................................................ 16

Models without Models withPower supplyelectric heaters electric heaters

42WHC016 42WHE016

42WHC020 42WHE020 230V ~ 50Hz

42WHC028 42WHE028

42 WHC/WHE

GB - 2

User instructions

Read this instruction manual thoroughly before using theunit.

• This unit complies with low-voltage (EEC/73/23) and electro-magnetic compatibility (EEC/89/336) directives.

• This unit will only work safely and correctly, if installed and testedby qualified personnel

• Do not use damaged equipment.In case of a malfunction turn the unit off and disconnect the mainssupply.

• Disconnect the electrical mains supply prior to anymaintenance operations or prior to handling any internalunit parts.

• Use this unit only for factory approved applications: the unitcannot be used in laundry or steam pressing premises.

• Be conscious of the room temperature and general comfort,particularly when this unit is used near children, senior orhandicapped people.

• This unit contains rotating equipment (fan). Ensure that this is outof reach for children.

• All of the manufacturing and packaging materials used foryour new appliance are compatible with the environment andcan be recycled.

• Keep this installation manual safe and hand it over to the newowner in case of sale.

Unit installation

• Check that voltage and frequency of the mains power supply arethose required for the unit to be installed; the available power mustbe adequate to operate any other possible appliances connectedto the same line.

• Check that all current national safety code requirements havebeen followed for the installation.In particular ensure that a properly sized and connectedground wire is in place.

• Inspect equipment for damage due to improper transportation orhandling: file an immediate claim with the shipping company.

• To work correctly, the air conditioner must operate only withinthe temperature indicated in the “Operating limits” table shownin this manual.If the unit is made to operate beyond the limits cited above,malfunctioning or water leaks may occur.

• Failure to observe electrical safety codes may cause a fire hazardin case of short circuits.

• The manufacturer declines all responsibility in the case ofmodifications and electrical or hydraulic connection errors causedby a failure to observe the instructions shown in this installationmanual or in the case of operation in conditions different to thosefor which the unit was designed.In these cases the guarantee is no longer valid.

General information

IMPORTANT :The electric heater must always be factory installed(mod. 42WHE).The use of other electric heaters is absolutely prohibited.Failure to follow this safety requirement causes unitdamage and voids the warranty.

The unit is fitted with a manually reset thermostat (mod. 42WHE).It is therefore essential to install the unit in such a way as toguarantee accessibility to the thermostat.

Choosing the installation site

Positions to avoid:

• Exposed to direct sun.

• Too close to heat sources.

• On humid walls or positions with water hazard, e.g. laundrypremises.

• Where curtains or furniture may obstruct free air circulation.

Recommendations:

• Choose an area free from obstructions which may causeirregular air distribution and/or return.

• Check that the wall surface is flat enough to allow easy and safeinstallation. The wall structure should be strong enough to carrythe unit weight and avoid deformation, rupture or vibration duringoperation.

• Consider using an area where installation is easy.

• Choose a position that allows for the clearances required (seedrawing).

• Look for a position in the room which assures the best possibleair distribution.

• Install unit in a position where condensate can easily be piped toan appropriate drain.

GB - 3

42 WHC/WHEE N G L I S H

Exposure to direct sunshine, when unit is operating in coolingmode; always use shutters or shades.Positions too close to heating sources which may damage the unit.

Connecting condensate piping to sewage system drain withoutappropriate trap. Trap height must be calculated according to the unitdischarge head in order to allow sufficient and continuous water evacuation.

Only partial insulation of the piping.

Installation not correctly levelled which will cause condensatedripping.

Flattening or kinking the refrigerant pipes or condensate pipes.

Any obstruction of the unit air outlet or return.

Exposure to oil vapours.

Installation in areas with high frequency waves.

Any rise in the condensate drain piping.

Horizontal condensate drain piping with less than 2% slope.

Warnings: avoid…

42 WHC/WHE

GB - 4

Dimensions and weight

Table I: Nominal data

• Unit is not suitable for operation in laundry premises.

• When sizing the power supply cable, and delay type fuses,consult the electrical connections section in this manual.

Note:All the values in the table include the valve power input.

Mod. 016 020 028A mm 800 800 800

B mm 290 290 337

C mm 190 190 215

D* mm 45 45 45

kg 14,5 14,5 15kg

ELECTRIC POWER INPUT

42 WHC

Cooling HeatingW W

42WHC016 30 –

42WHC020 30 –

42WHC028 28 –

42 WHE42WHE016 30 1030

42WHE020 30 1030

42WHE028 28 1028

* Hanging panel / valve kit

A

B

C

D

42 WHC/WHE

GB - 5

E N G L I S H

Table III: Operating limitsMinimum entering water temperature: 6°C

Water circuitWater- side maximum pressure Maximum entering water temperature: 60°C1400 kPa (142 m Water Gauge) Maximum entering water temperature

with electric heaters: 45°C

Indoor temperature Minimum temperature: 5°C (1)

Maximum temperature: 32°C

Power supply Nominal single-phase voltage 230V ~ 50Hz - min. 198V - max. 264V

Ref. Description Q.ty Use

� Unit

1 Installation manual 1 Unit installation

� Hanging panel / valve kit 1 Unit installation

1 Screw anchors and screws 4 + 4 Fixing the hanging panel to the wall

2 Control 1 Selecting the ambient temperature

3 Screw anchors and screws 2+2 Control installation

4 Screw 1 Safety screw

Minimum clearances (mm)

2020

80

Table II: Material supplied

(1) If the outdoor temperature can go down to 0°C, it is advisable to empty the water circuit to avoid breaks caused by ice (see paragraph on waterconnections).

42 WHC/WHE

GB - 6

Hanging panel

Hanging panel with water valve Hanging panel without water valve

Two types of hanging panel are available: one is for use ininstallations with a water valve and the other without.

Hanging panel with water valve

The panel contains:� water shut-off valves with 1/2” female gas threaded fitting for

connection to the water system;� thermo-electric valve piloted by the room thermostat control;� printed circuit for electrical connections;� unit support chain; this permits the unit to be swung downwards

through 90° facilitating installation;� flexible pipes with threaded fitting for the unit hydraulic connection;� control.

The system side hydraulic connections are made inside thehanging panel, using the 1/2” female gas threaded fitting of theshut-off valves.The unit is then connected to the valve group using the flexiblepipes supplied in the hanging panel.

Hanging panel without water valve

The panel contains:� printed circuit for electrical connections;

� unit support chain; this permits the unit to be swung downwardsthrough 90° facilitating installation;

telescopic extensions;

side closing plugs;� control;

The water connections are made using the copper pipes suppliedwith the unit and fitted with 3/8” male gas threaded fittings.

If the installation foresees the use of side closing plugs ,fix them with the screws supplied (ref. a) before hanging the panelon the wall.

If you use the telescopic extensions make sure that these closeagainst the wall.

Hanging panel dimensions

Height Width DepthVolume with

Panel type packagingmm mm mm m3

Without water valve 320 900 45 0.031With water valve 282 / 320 790 45 0.025

Hanging panel weightPanel weight

Panel weight withPanel type packaging

kg kg

Without water valve 4.5 5With water valve 5 5.5

��

� �

�

�

�

�

a

GB - 7

42 WHC/WHEE N G L I S H

Installing the hanging panel

Bear in mind the minimum space from the walls to the ceiling (seeminimum space).Hold the fixing plate to the wall.

Installation panel

Hanging panel with valves(dimensions mm)

Hanging panel without valves(dimensions mm)

� Holes for fixing panel� Passage holes for connection pipes� Passage hole for electric control cables� Passage hole for condensate drain pipe

Level the plate with a plumb line or spirit level and mark the 4 holes� to be made.

Drill and fix the plate to the wall (No. 4 anchors).Check that the plate is fixed correctly (No. 4 screws) to prevent anyvibration.

Water connections

NOTE:Make certain the pipe insulation reaches as far as the valve.

The hydraulic fittings are fixed to the hanging panel structure toprevent breakage when the pipes are connected; we advisekeeping the fittings still using a spanner.

� Holes for fixing panel

790

282

(016

-020

)

45

320

(028

)

�

�

��

��

45

90032

0

�

42 WHC/WHE

GB - 8

For installation of hanging panel without water valve, use H07V-Ktype single pole cables with the following sections:

a) electrical power supply : 1.5 mm2;

b) control; : 1 mm2;

c) The power supply connection cable must be carried out as perside figure, preparing the cable as shown.

d) ensure that the connection to the electrical supply is madethrough a single pole switch with minimum contact opening of atleast 3 mm;

e) fit the gL type delayed fuses to the power supply line as shownin the following table:

ModelFuse gL type

A016 2

42WHC 020 2028 2016 6

42WHE 020 6028 6

Electrical connections

For installation of hanging panel with water valve, use H07V-K typesingle pole cables with the following sections:

a) electrical power supply : 1.5 mm2;

b) control; : 1 mm2;

To facilitate the cable connection operations, follow the connectionsequence in tabes IV and V.When removing the unit, proceed in the opposite way.

The electrical connections to the mains power supply and controlare made on the printed circuit housed inside the panels.The connections between the printed circuit and the unit are madeusing polarised connectors that facilitate installation and any possibleunit removal operations: they also prevent connection errors.

Inside the unit there are the following thermostats:

a) cold draft prevention thermostat (cooling only models);

b) only for unit with electric heater: 2 electric heater safetythermostats (the first with automatic reset, the second withmanual reset, both factory fitted);

c) high water temperature protection thermostat (accessory only for unitswith an electric heater in combined operation - heater + hot water).

Printed circuit for electrical connectionsPrinted circuit types:• printed circuit for unit without electric heater;• printed circuit for unit with electric heater.

Table IV: Printed circuit for unit without electric heatersConnection Reference

ConnectionConnection Number of Installer

sequence figure device poles connection

1 M1 Water valve Screw terminal block 2 X

2 M5Wall control with

Screw terminal block 7 Xroom thermostat

3 M3 Condensate drain pump Screw terminal block 3 X

4 (accessory) M2 Season change-over thermostat Screw terminal block 3 X

5 GND Ground Ground 2 male faston connectors X

6 CN1 Fan motor Polarised connector 6 X

7 CN2 Cold draft protection thermostat Polarised connector 2 X

8 M4 Power supply Screw terminal block 3 X

=== RL1 Cold draft protection relayConnections only

===on printed circuit

Mod. 42WHC connections

� To unit motor� Ground� Condensate drain pump� Season change-over thermostat

(accessory)� Valve� CDP thermostat� Fuse� To control

FAN MOTOR

M4

CN1

L N HT C CL V1 V2 RL1

L N 1 2 3 4 5 6 7

M5

CDP

230V

~ 5

0/60

Hz

GNDM3 PUMP M2 C/OVER M1 VALVE

�

� � � �

���

F1

CN2

Pass the power supply and control cables in a plastic conduit.

GB - 9

42 WHC/WHEE N G L I S HElectrical connections

Table V: Printed circuit for unit with electric heaterConnection Reference Connection Connection Number of Installersequence figure device poles connection

1 M1 Water valve Screw terminal block 2 X

2 M5Wall control with

Screw terminal block 8 Xroom thermostat

3 M3 Condensate drain pump Screw terminal block 3 X

4 GND Ground Ground 2 male faston connectors X

5 CN2 Electric heater Polarised connector 3 X

6M2

High water temperatureScrew terminal block 2 X

(accessory) protection thermostat

7 CN1 Fan motor Polarised connector 6 X

8 M4 Power supply Screw terminal block 3 X

=== RL1 Electric heater auxiliary relayConnections only

===on printed circuit

=== SW1Electric heater only / Connections only

===heater + hot water switch on printed circuit

Mod. 42WHE connections

FAN MOTOR

M4

CN1GND

PUMP M3 M2 M1 VALVE

L N TH HTR V1 V2RL1

L N 1 2 3 4 5 6 7 8

M5

CN2 H 0 + HTR2

ONLY HTR

SW

1

230V

~ 5

0/60

Hz

HE

AT

ER

� � � �� �

�

F1

�

� To unit motor� To the electric heaters� Ground� Condensate drain pump� Max. water temperature

thermostat� Valve� Operation mode selector� Fuse To control

GND

FAN MOTOR

M4

CN1

L N HT C CL V1 V2 RL1

L N 1 2 3 4 5 6 7

M5

CDP

CN2

M3 PUMP M2 C/OVER M1 VALVE

�

1090

60

F1

To control� Power supply

42 WHC/WHE

GB - 10

Electric heaters

Electric heater

There are two, armoured heaters connected together in series.The powers obtained are described in the table.Operation with electric heaters at the same time as with hotwater is only possible if the temperature of the water enteringthe coil is lower than 45°C; to enable the heater + hot waterfunction you must:

a) configure the relevant SW1 switch on the printed circuit;

b) install the coil maximum temperature protection thermostat(accessory).

If the unit is configured for simultaneous heater and hot wateroperation and the coil maximum temperature protection thermostatis not installed, the unit cannot operate in heating mode.

� heater + hot water switch� Only electric heaters

FAN MOTOR

M4

CN1GND

PUMP M3 M2 M1 VALVE

L N TH HTR V1 V2RL1

L N 1 2 3 4 5 6 7 8

M5

CN2 H 0 + HTR2

ONLY HTR

SW

1

HE

AT

ER F1

�

�

Table VI: Technical data of electric heaters

Model 42WHE 016 020 028

Electric heater capacity W 2 x 500 2 x 500 2 x 500

Supply voltage V 230 ~ 50Hz 230 ~ 50Hz 230 ~ 50Hz

Max current drawn A 5 5 5

Automatically resetsafety thermostat

open 60°C ± 3°C; closed 45°C ±3°C

Manually resetsafety thermostat

open 75°C ±5°C

GB - 11

42 WHC/WHEE N G L I S HWiring diagram

Unit without electric heater

Unit with electric heater

WARNING:Any warranty is invalid if factory wiringand settings are changed on site.

NOTE:The connection sequence does notrepresent the physical layout.

LEGEND:

� Air Conditioner� Hanging panel� Control

Factory wiring

Field wiring

Appliance connection point

Terminal block connection point

Normally open contact

Normally closed contact

Fuse

RL1 Cooling relay

F1 Fuse

HTR Electric heater

EV Solenoid valve

FC Fan motor capacitor

FM Fan motor

P Condensate drain pump

PCB Printed circuit

ST Safety thermostat

TH Thermostat

SW Switch HTR / HTR + H2O

Accessory

LEGEND:

� Air Conditioner� Hanging panel� Control

Factory wiring

Field wiring

Appliance connection point

Terminal block connection point

Normally open contact

Normally closed contact

Fuse

RL1 Cooling relay

CT Season change-over thermostat (accessory)

CTH Fan thermostat

EV Solenoid valve

FC Fan motor capacitor

FM Fan motor

P Condensate drain pump

PCB Printed circuit board

TH Thermostat

F1 Fuse

Accessory

CABLE COLOUR:A BrownB BlueC BlackR RedW WhiteY/G Yellow/Green

67 1 4 3 2 5L N

230V ~ 50Hz

L N HT CL V1C V2

C

B

A

W

R

C

BY

/ G

RA

W

W

CTH

FM FC

�

RL1

CN2

CN1

F1

�

P C B

CT EV

P

TH

HIG

H

ME

D

LO

W

ON-OFF

67 1 4 3 2 5

�

230V ~ 50Hz

L N TH V1 V2

C

W R C B

Y / G

R

�

RL1

CN2

CN1

F1

�

PCB

EV

TH

HIG

H

ME

D

LO

W

ON-OFF

67 1 4 3 2 5

�

8

COOL FAN HEAT

BA

FM

FC

L N 67 1 4 3 2 58

2HTR

1HTR

ST1

ST2

ST3

P

HTR

R

B

SW

H T R

H T R + H 2 O

=

=

42 WHC/WHE

GB - 12

Controls and functions

Two types of electromechanical controls are available:

a) control for unit without electric heater.

b) control for unit with electric heater.

Both the controls are electromechanical and do not therefore permitthe operation of groups of units and/or the connection of supervisorand control systems.• Position the control on a non-perimeter wall• Position the control away from sources of heat• Position the control so that it is not reached by the air flow leaving

the unit• Position the control away from doors, windows and air currents• Position the control at 1.5 m from the floor.

Control for unit without electric heater (figure 1)This control permits two types of temperature control:• water control: by opening and closing the solenoid and stopping

the fan at the same time.• controlling the air: in this case the solenoid is not fitted, control

takes place by switching the fan on and off.

Note: If the air is controlled and water is circulated,condensate may form on the unit.The control functions are:� on/off (switching on and off the unit chosen by the user);� three fan speeds chosen by the user;� user choice of room temperature.

If the installation includes both cooling and heating operation, aseason change-over thermostat (accessory) must be installed onthe water piping before any valve present.If the installation includes operation in only one of the two cooling orheating modes, no season change-over device is necessary.

The printed circuit is supplied fitted with a jumper which permitsoperation in cooling mode only - � to permit operation in heatingmode only �, the jumper must be moved to the appropriateposition.

Jumper positions on the change-over terminal block

Control for unit with electric heater (figure 2)This control regulates by opening and closing the valve and byswitching the heater on and off based on the selected set-point.This control does not permit temperature control by switching thefan on and off (air control).The control functions are:� on/off (switching the unit chosen by the user on/off)� three fan speeds chosen by the user� the user selecting the room temperature� cooling/ventilation/heating only (user chooses the operation

mode).

Manual reset of the second electric heater protectionthermostat

Electric heater safety protection function

This function is supplied as standard only for units with electricheaters and is executed by two thermostats whose capillary pipesare inserted into the fins of the heat exchanger coil.The thermostats are both independent and electrically connected inseries. The first, an automatically reset thermostat switches off theheaters if the heat exchanger coil temperature rises above 60°Cand permits re-starting when the heat exchanger coil temperaturefalls below 45°C.The second, a manually reset thermostat switches off the heaters ifthe heat exchanger coil temperature rises above 75°C, and permitsre-starting only when both of the two following conditions aresatisfied:a) the heat exchanger coil temperature falls to 45°Cb) the reset button - accessed through the front panel - is pressed.

The operation of manually resetting the second safetythermostat MUST be exlusively performed by TechnicalAssistance Service personnel.

Positioning the coil high temperature protection thermostat bulb

Maximum water temperature protection functionThis function is only used for units with an electric heater and unitenabled for simultaneous electric heater and hot water operationduring installation. This function is executed by a thermostat(accessory), whose bulb is positioned in contact with the waterentering manifold; the thermostat stops the electric heaters whenthe water temperature entering the unit rises above 45°C. If thisthermostat is not installed, the unit cannot operate in heating mode.If this thermostat is incorrectly installed, permanentdeformation to the plastic parts of the unit may be caused dueto the high temperatures that may be reached.

Cold draft prevention functionThis function is supplied on units without electric heater; in theheating cycle it stops the fan from creating discomfort by blowingtoo much cold air into the room.This function is executed via a thermostat whose bulb is located onthe water entering manifold of the heat exchanger coil.

Room thermostat installation

�

�

�

�

�

�

�

Figure 1

Figure 2

Cooling

�

M2 C/OVER

HT C CL

Heating

M2 C/OVER

HT C CL

�

GB - 13

42 WHC/WHEE N G L I S H

At this point the unit can be installed by completing the water andelectrical connections.

Hook the unit onto the hanging plate, using the lower hooks � andchain �.

Finish making the water connections

If the installation is executed with the aid of the panel with valves,connect the flexible pipes � to the coil pipes following the“inlet/outlet” indications on the plate (IN/OUT plate on the pipes).

To ensure correct installation, it is important to make certain thatthe 90° coupling on the flexible pipe is perpendicular to the unitback when tightening this to the unit pipes.

If the installation is made using the panel without valves,connect the system pipes to the coil pipes following the water“inlet/outlet” indications (IN/OUT plate on the pipes).

Unit installation

�

�

�

Note:Do not bend or crush the unit pipes.Avoid tight bends with a radius of less than 100 mm.Do not bend the pipe more than three times in the same place.Do not excessively compress the insulation on the connection pipeswith clamps and tape.

Condensate drain pipe and other piping

Position the condensate drain pipe towards its hole in the panel andensure that this slopes towards the outside.Connect this pipe to a suitable drain using PVC pipe.The horizontal lengths between the indoor unit and the drain musthave a minimum slope of 2%.

Completing the electrical connections

Complete the electrical connections by connecting the unit wiringconnectors to the printed circuit (see the Electrical Connectionsparagraph).

Check

Check that the system is filled with water and check the tightness ofall connections/fittings.

Finally wrap connections with anti-condensate insulation andtighten with tape, without exerting great pressure on the insulation.Repair and cover any possible cracks in the insulation.Connection pipes and electric cables must be fixed to the wall usingappropriate conduits.

Carefully insulate the pipes close to the valve couplings to preventcondensate from forming on them and possible dripping.

� Tube� Tube insulation� Fastening tape

2% min

��

�

42 WHC/WHE

GB - 14

ATTENTION:Before hanging the unit, position the chain by hooking it intothe hole provided.

Hook the unit onto the hanging panel.Make sure the unit fits on the panel.

Tighten down screw � on the panel to ensure safety.

If necessary, release the unit and reverse the procedure.

Pour water into the unit condensate pan and check that it flowsfreely to the drain.

Air venting

The upper coil coupling has an air vent and drain valve, adjustablewith 8 and 12 mm spanners.

Air must be vented from the hydraulic circuit. To perform thisoperation it is sufficient to use the valve on the coil.This operation must be performed with the unit hanging on thepanel in a vertical position.

DrainingIf the unit has to be removed, the water in the coil can be drained inthe following way:• Un-hook the unit and position it in a horizontal position using the

chain and hooks;• close the shut-off valves situated before the valve;• to drain, open the air vent valve on the coil;• slowly slacken the connection between the pipe and the coil pipe.This operation permits partial coil draining; in any case, the quantityof drained water is sufficient to guarantee removal of the unitwithout any further water losses, when disconnecting theconnections between the flexible pipes and unit pipes.Before removing the unit, we recommend closing the two unit pipeswith plugs to prevent the small amount of water left running out ofthe coil.

Unit installation

Thermo-electric valve operation• This 3-way valve is of the ON/OFF type with very slow

movement.It is not a modulation valve. This valve is controlled by the controlinstalled in the same room as the unit.

• The thermo-electric valve is normally closed towards the coiland open towards the bypass route.The valve opens in around 3 minutes circulating the water in thecoil.

• When the desired room temperature is reached, the valvecloses in around 3 minutes towards the coil and opens towardsthe bypass.

The valve is factory-connected and no connection is thereforeneeded.

� �

�

� Spanner 8 mm� Spanner 12 mm

Thermo-electric control valve

� Thermo-electricvalve head

� Valve body

�

�

OUT

OUT

IN

Hanging panel with water valve

Hanging panel without water valve

GB - 15

42 WHC/WHEE N G L I S H

Correct cleaning• Turn the unit off and switch the mains supply off.

Use only a clean, damp and soapy cloth.Do not pour any liquids on the unit.Do not use flammable liquids, solvents or abrasive powders.

Keep heat sources away from the unit and do not place anythinghot on it: panels may be damaged.The controller only should be cleaned with a dry cloth.

Before a long shutdown period

Clean the filters and reposition them in the unit. Run the unit in fanonly mode for a few hours to dry the inside.

Switch the electric mains supply off.

Clean the unit.

Optimum comfort and lowest consumption

Keep room temperature to comfort levels.

Do not open doors and windows more frequently than necessary.

In the cooling mode, avoid direct sun in the room: if possible, shutcurtains or shades.

Do not obstruct the air intake or outlet of the unit. Obstructions willcause a reduction of the air quantity and the conditioning effect,resulting in a unit malfunction.

Ensure that the air filters are clean.Ensure that the air distribution in the room is uniform by correctlyadjusting the air flow direction.

Optimum comfort and lowest consumption -Correct cleaning - Before a long shutdown period

42 WHC/WHE

GB - 16

Troubleshooting guide for the owner, accessories

Troubleshooting

Air conditioner will not start:• Main supply switch is OFF; switch to ON.• Fuses on main switch are burnt out; replace fuses.• Selected temperature is higher than the room temperature (or

lower in the heating mode).

Air conditioner is not supplying sufficient capacity:• Free air circulation is obstructed on the unit.• Dirty filters reduce air quantity circulating.• Doors and/or windows are open.• Fan speed has been set to 'low'.• The indoor unit air flow grill is not directed for optimal ventilation.• Selected temperature is not correct.• The water flow rate is insufficient• Air present in the hydraulic circuit• Thermo-electric valve does not open.

Mist comes out of the unit:• A slight mist, coming out of the unit air outlet, can sometimes be

noticed during cooling operation. This is due to the cool air cominginto contact with the room air.

A slight whistling noise is heard when the air conditionerstarts or stops:• This is water circulating.

Table VII: Accessories

Description Part number 42WHC 42WHE

016 020 028 016 020 028

Activated carbon filter 42HWX 900---102-40 � � � � � �

Passive electrostatic filter 42HWX 900---103-40 � � � � � �

Change-over thermostat kit 42WH9007 � � �

High water temperature protection kit 42WH9008 � � �

Condensate drain pump 42WH9009 � � � � � �

Unpleasant smells coming from the unit:• Unpleasant odours may originate from substances accumulated

on the unit air filter.Stop unit and clean filters after switching mains supply off.Restart unit in the ventilation (fan only) mode and open windowsto change room air.

Strange noises are coming from the unit:• The unit may sometimes emit strange noises, when switched on,

during operation and switching off.These are generally due to the effect of temperature changes onthe plastic parts.

Restart air conditioner after having corrected the faults.

WARNING: (models with electric heaters):• If the manual reset thermostat trips, contact the authorized Zone

Assistance Centre.

Guide for the ownerOnce installation is complete, use this manual to train the userhow to correctly run the air conditioner and about selectingfunctions, such as:

• Turning the unit on and off.• Control functions.

Give this manual to the user for consultation.

L010122H45 - 0502

Via R. Sanzio, 9 - 20058 Villasanta (MI) Italy - Tel. 039/3636.1

The manufacturer reserves the right to change any product specifications without notice.

Order No. 14239-74M6, May 2002. Supersedes Order No. 14239-74M6, September 2001. Printed in Italy