ASSEMBLY DIAGRAM
LEGEND
System circulating pump
CiR
PSG
Safety gas pressure switch
PA
Air pressure switch
PH
O
Water pressure switch
2
E.A.
Ignition electrode
Detection electrode
E.R.
TRA
Transformer
Main switch
IG
VG
Gas valve 1-2
pa27 terminal board
M1
VD
3-way valve
Summer/winter switch
E/I
TA
Room thermostat
Water-heater thermostat
TB
To connect the room thermostat TA, remove the bridge 1-2 from the M1 terminal board.
SE
External sensor
Return sensor
SR
SM
Delivery sensor
Fan
VN
X2
Amp. 13-pole connector
Amp. 6-pole connector
X3
X4
Amp. 2-pole connector
X7-X8 PC connector
3AT
Fuse 3A (electric fan)
2AF
Fuse 2A (24 V circuits)
2AF(F1) Power supply fuse 230 V (2 A)
CL
230 V 50 Hz power lead
Connector Wieland
C
FA
Anti-interference filter
40