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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Roberts Gorden CTU 22 TO 115 Troubleshooting for Flame Supervision System, Troubleshooting for Solenoid Valves

CTU 22 TO 115 specifications

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