3
3 3.2 COMBI HE & COMBIPAC HE - INSTALLER GUIDELINES
Power to burner
L1 = switch live
L3 = permanent live
High limit thermostat probe A
Boiler thermistor probe B
Please note that a permanent live connection
is required to enable the pump over run and frost
protection. It is also required to operate the post-purge
function on the burner, when applicable.
If a permanent live supply is not provided
the burner will not operate.
Permanent live
Earth
Neutral
Hot water timer switch
live
Heating timer switch
live
Room stat
IMIT 110°C
thermostat
Pressure switch
Limit
Lock out
Green D.H.W
Green C.H
Motorized
valve
Circulating
pump
Flow switch thermistor probe D
Tank thermistor probe C
Tank
Boiler
Flow
15
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