COMBAT® CTCU UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

14.3 Troubleshooting for Flame Supervision System

To measure flame current, connect a 0 - 50 μA DC meter in series with the flame probe. If the meter reads negative values, then reverse the test leads.

START

Connect a DC ammeter in series with the flame probe.

Is the flame present and at least 1 µA DC flame current?

Yes

Is there a current flowing in the

flame probe circuit with no

flame present?

No

Does “lockout” occur when there is a flame present?

No

Heater Operating

TROUBLESHOOT ENDS.

No

Use Section 14.1 to

 

 

trace the fault.

 

 

 

Is the connecting lead

 

Repair or replace as

Yes

damaged? Is the flame probe

Yes

damaged or touching earthed

necessary.

 

components?

 

 

 

Is inlet burner gas pressure

 

 

Yes

correct? Is live and neutral

Yes

Control box faulty.

polarity correct? Is

Replace with correct type.

 

flame probe circuit correct?

 

 

 

No

 

 

 

Repair or replace as

 

 

 

necessary.

 

 

If problems persist, contact

No

Roberts-Gordon Ltd. at

www.rg-inc.com

 

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

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Roberts Gorden CTCU 27, CTCU 15, CTCU 11, CTCU 22, CTCU 7 service manual Troubleshooting for Flame Supervision System, Start

CTCU 7, CTCU 22, CTCU 11, CTCU 15, CTCU specifications

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