18
1
3
5
W4
W5
4
6
8
7
9
2
1
System filling valve
2
Condensate outlet
3
Safety valve outlet
4
Liquid level indicator
5
Boiler drain
6
Thermostatic expansion valve
7
HP by-pass solenoid valve
8
HP high pressure switch
9
HP high pressure switch
W4
Boiler connector (gas side) – Main
control panel
W5
HP-main control panel connector
Fig. 34