Carrier 42GW Wiring diagram legend, Connections, Important for units with electric heaters

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