Roberts Gorden CTU 22 TO 115 service manual 15.3Troubleshooting for Flame Supervision System

COMBAT® CTU UNIT HEATERS INSTALLATION OPERATION AND SERVICE MANUAL

15.3Troubleshooting for Flame Supervision System

START

Connect a DC ammeter in series with the flame probe.

Is the green light on and		Use section 15.1 to
at least 1 µA DC flame	No
		trace the fault.
current?
Yes
Is there a current flowing in the		Is the connecting lead		Repair or replace as
	Yes	damaged? Is the flame probe	Yes
flame probe circuit with no		damaged or touching earthed		necessary.
flame present?		components?
No
Does “lockout” occur when		Is inlet burner gas pressure
	Yes	correct? Is live and neutral	Yes	Control box faulty.
there is a flame present?		polarity correct? Is		Replace with correct type.
		flame probe circuit correct?
		No
		Repair or replace as
		necessary.
No
		If problems persist, contact
Heater Operating	No	ROBERTS GORDON® at
TROUBLESHOOT ENDS.		Tel: +44(0) 121 506 7709
		www.rg-inc.com

NOTE: Minimum flame probe current 1 μA DC. Typical flame probe current 3-5 μA DC.

15.4Troubleshooting for Solenoid Valves

START

Is 230 V at the valve

terminals at the appropriate time.

Yes

Is gas pressure at inlet of the valve correct for gas type?

Note pressure found.

Yes

Does gas pressure at outlet

of the valve rise when

valve turns on?

Yes

Does gas pressure at

outlet of valve return to zero or

lower when valve turns off?

Yes

Valve Operating

TROUBLESHOOT ENDS.

No Fault elsewhere

No Fault elsewhere

Valve faulty.

No Replace with one of correct type.

Valve faulty.

No Replace with one of correct type.

If problems persist, contact

No	ROBERTS GORDON® at
	Tel: +44(0) 121 506 7709
	www.rg-inc.com

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