DOMINA 80 E
53
8.02 Limit thermostats
T/Stat
Location
Function
Nominal
Circuit
Wiring
Operating
Colours
Temperature
C.H. Limit
Top RHS
Shuts downmain
88
°
C
Low voltage
Blue
of Heat
burner if boiler
DC
Brown
Exchanger
thermostat fails
Frost
Incorporated Fires the boiler
7
°
C - 14
°
C
Low voltage
Red
in C.H.
and runs pump to
DC
Red
Sensor
maintain minimum
water temperature
Overheat
Top LHS
Protect boiler by
100
°
C
240V AC
Brown
of Heat
stopping ignition
Blue
Exchanger
and cuts power
to gas valve
The MFO2 PCB has five diagnostic lights, each light corresponds to a particular function and will light in
turn as the boiler goes though its sequence of operations.
In order, the five lights indicate:
1
Mains electricity on/low voltage on
2
Flow meter operated
3
C.H. controls, room thermostat/clock and temperature regulator calling
4
C.H. waiting time (approximately three minutes)
5
Low water pressure switch - WARNING
Note:
Always check for sufficient gas supply (20mbar inlet working pressure for NG and 37mbar for LPG).
Minimum of 22 mm diameter pipework on C.H. flow and return with adequate by-pass. A correctly
installed flue system and a 3 amp fuse.