Combat HVAC ELU 100, Installation And Commissioning Manual, Page: 41 / 52

Unit Heater Installation, Commissioning, Operation and Service Manual
35 36
Combat Elite Unit Heater EL231117 Orig
Start
Connect a DC ammeter
inseries with the
flame probe
Is the green light on and at
least 1µA DC flame current?
Is there a current flowing in
the flame probe circuit with
no flame present?
Does “lockout”occur when
there is a flame present
Heater Operating
TROUBLESHOOT ENDS
Is inlet burner gas pressure
correct?Is live and neatural
polarity correct? Is flame probe
circuit correct?
If problems persist, contact
Combat HVAC Limited at
tel: +44(0)121 506 7709
Is the connecting lead
damaged? Is the flame probe
damaged or touching earthed
components?
Control box faulty. Replace
with correct type
Use section 16.1 to trace the
fault
Yes
Yes
No
No
No
Repair or replace as
necessary
Repair or replace as
necessary
No
Yes
Yes
Yes
No
Start
Is 240 V at the valve
terminals at the appropriate
time?
Is gas pressure at inlet of
valve correct for gas type?
Note pressure found.
Does gas pressure at outlet
of the valve rise when valve
turns on?
Heater Operating
TROUBLESHOOT ENDS
If problems persist, contact
Combat HVAC Limited at
tel: +44(0)121 506 7709
Yes
Yes
Yes
Yes
Fault elsewhere
No
No
No
No
Valve faulty. Replace with one
of correct type.
No
Fault elsewhere
Does gas pressure at outlet
of valve return to zero or
lower when valve turns off?
Valve faulty. Replace with one
of correct type.
16.4 Troubleshooting for Solenoid Valves
SECTION 16
Note: Minimum flame probe current 1 µA DC.
16.3 Troubleshooting for Flame Supervision System SECTION 16