42 GW

Electrical connections

The control panel can be reached by opening the grille and removing the metal covers using the 3 or 4 screws.

IMPORTANT for units with electric heaters;

The unit is equipped with two thermostats: one with automatic reset and one with manual (electric) reset that can be reactivated by switching the power supply off and then on.

IMPORTANT:

Make ground connection prior to any other electrical connections.

If the unit is fitted with an electric heater, this must have a separate power supply.

Ensure that the mains supply connection is made through a switch that disconnects all poles, with a contact gap of at least 3 mm.

Fix the power cable of the electric resistance heaters under the single cable clamp. Make certain that the YELLOW/GREEN cable is stripped back further than the others.

Connect the power cables to terminal box connectors in accordance with the wiring diagram and tighten firmly.

Wiring diagram legend

 

 

 

 

 

 

 

Factory wiring

Low speed

 

 

 

 

 

 

 

 

 

 

 

 

 

Field wiring

Medium speed

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Connector

High speed

 

 

 

 

 

 

 

Terminal on terminals

Power supply line

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Normally closed contact

Heating selection

 

 

 

 

 

 

 

Normally open contact

 

 

 

 

 

 

 

Common thermostat (heating)

 

 

 

 

 

 

 

Capacitor

 

 

 

 

 

 

 

Cooling selection

 

 

FC

 

Fan capacitor

 

 

 

Common thermostat (cooling)

 

 

FS

 

Safety switch float

 

 

 

Neutral fan

IFM

 

Fan motor indoor unit

 

Neutral in

 

 

PR

 

Drain pump relay

 

 

 

 

 

 

PS

 

Drain pump

Neutral out

 

 

 

 

C1-3

 

Connectors

Neutral

 

 

 

 

HR

 

Heating relay

Heating out

 

 

CR

 

Cooling relay

Cooling out

CEV

 

Electric valve (cooling)

 

HEV

 

Electric valve (heating)

 

PCB

 

Relay board

 

HTR

 

Electric heater

 

 

 

ST

 

Safety thermostat

 

TTimer

TB Terminal board

Cables colour

ABrown

BBlue

CBlack

GGrey

RRed

WWhite

Y-GYellow/Green

Connections

LLine phase

NNeutral

Warning:

Any warranty is declined in case of field changes of factory wiring and settings

Note

The connection sequence does not represent the physical lay-out.

GB - 12

Page 13
Image 13
Carrier 42GW Wiring diagram legend, Connections, Important for units with electric heaters, Cables colour