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42 GW
GB - 12
Connect the power cables to terminal box connectors in
accordance with the wiring diagram and tighten firmly.
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.
The control panel can be reached by opening the grille and
removing the metal covers using the 3 or 4 screws.
Electrical connections
Wiring diagram legend
Low speed
Medium speed
High speed
Power supply line
Heating selection
Common thermostat (heating)
Cooling selection
Common thermostat (cooling)
Neutral fan
Neutral in
Neutral out
Neutral
Heating out
Cooling out
Factory wiring
Field wiring
Connector
Terminal on terminals
Normally closed contact
Normally open contact
Capacitor
FC
Fan capacitor
FS
Safety switch float
IFM
Fan motor indoor unit
PR
Drain pump relay
PS
Drain pump
C1-3
Connectors
HR
Heating relay
CR
Cooling relay
CEV
Electric valve (cooling)
HEV
Electric valve (heating)
PCB
Relay board
HTR
Electric heater
ST
Safety thermostat
T
Timer
TB
Terminal board
Connections
L
Line phase
N
Neutral
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.
Cables colour
A
Brown
B
Blue
C
Black
G
Grey
R
Red
W
White
Y-G
Yellow/Green