Roberts Gorden DAT75 Troubleshooting for Solenoid Valves, Troubleshooting for Main Fan, Start

DUALAIR® HEATING AND COOLING UNITS INSTALLATION OPERATION AND SERVICE MANUAL

15.4 Troubleshooting for Solenoid Valves

START

Is 230v 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) 190 249 8733
	or www.rg-inc.com

15.5 Troubleshooting for Main Fan

START

Does fan run

automatically? No

Yes

Does fan turn on and

off while burner is firing Yes continously?

No

Fan Operating

TROUBLESHOOT ENDS. No

Is Power supply 400 V

between any two phases or 230 V between any Phase and No N at the main terminal block?

Yes

Does fan run when the white button of combination fan/limit No

thermostat is pushed in?

Yes

Use Section 5.3 & 11.3 to check

combination fan/limit

thermostat settings. Reset or

replace as necessary.

If problems persist, contact ROBERTS GORDON® at Tel: +44(0) 190 249 8733 or www.rg-inc.com

Fault elsewhere.

Check wiring.

Is there 230v between	No	Combination fan/limit
terminals 1 and N of the		thermostat faulty.
main terminal block?		Replace with correct type.
Yes
Fan motor or contactor faulty.
Replace with correct type.
Use Section 15.6 to
trace fault.

For your safety and optimum heater performance use only ROBERTS GORDON® replacement parts.

Conduct Commissioning procedure as shown on Page 21, Section 11

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