12
2.9.7 Using suitably sized cabling, the BMS terminal block can be removed for easier wiring.
• Pins 1 - 2 allows a remote switch to be used for a boost switch (Note: NOT FOR MAINS WIRING).
• Pins 2 - 3 to be used exclusively with a ZGRC1 controller.
• Pins 4, 5 & 6 allows for remote fault indication. Relay will be energised upon detection of a fault.
Upon completion of wiring, carefully push fit BMS terminal block back onto PCB.
Figure 5 - Close-up of PCB with BMS connection points
Pin Function
Connection to External Circuit
1 Boost
For additional sensors to High
2 Ground
0V
3 Remote
Connecting to a ZGRC1 controller (option)
4 N/C
Volt - Free normally closed contact
5 N/O
Volt - Free normally open contact
6 Common
Relay common
Figure 6 - ZGRC1 Controller
Figure 7 - BMS Wiring Diagram
1 2 3 4 5 6
1
2
6
5
4
3
N/C
N/O
COM
ELECTRICAL CONNECTION / TERMINAL DIAGRAM
BOOST GND
REM
ZGRC1
REMOTE CONTROLLER
(ZGRC1 - Option)
VOLT FREE CONTACTS
GIVING FAULT
IDENTIFICATION
}
R
EM
G
N
D
BATHROOM SW.
(Volt free contact)
NOT RATED FOR
MAINS SWITCHING
BMS CONNECTOR
RL1 - RELAY
Note: Only one ZGRC1 boost and status controller can be installed with the ComfoAir 155 WM. Additional boost
actuation should be via either 'switch-live' or standard hardwired 2-position switches. A separate AUX switch
cannot be installed when using a ZGRC1 boost and status controller.
1
2
6
5
4
3
N/C N/O COM
BOOST GND REM
ComfoAir Unit
BMS Connector
2 core cable, 0.5mm Max.
(up to 15 metres)
ComfoAir 155 WM
BMS Connector
