Roberts Gorden DAT75, DAT90, DAT100 Troubleshooting for Fan Contactor, Start, Troubleshoot Ends

DUALAIR® HEATING AND COOLING UNITS INSTALLATION OPERATION AND SERVICE MANUAL

15.6 Troubleshooting for Fan Contactor

START

Does main fan run

automatically

in heating mode?

Yes

No	Is power supply 400v at		No	Fault elsewhere
	three phase and N at the
	main terminal?
	Yes
Does fan run when white		Is there 230v at contactor				Press in overload reset
button of combination No					No		No
thermostat is pushed in?			coil terminal A1 and A2?			button and retest.
	Yes			Yes		Yes
	Replace		Contactor faulty.		Overload operated. Check for
						three phases at mains
combination thermostat.				Replace.
						terminals, loose electrical

terminals and motor overload.

	Wiring faulty or faulty
	combination thermostat.
	Investigate.
	No
Is there 230v between	Has fuse 1 on the
terminals 96 and A1 on No	printed circuit board
the contactor?	blown?
Yes	Yes
Overload Faulty	Replace fuse and
	investigate.
Replace.

Does fan motor run with

little or no air flow?

No

Check filters and

ducting for blockage.

Yes

Does fan run

as burner fires?

Yes

Does main fan run

automatically

in cooling mode?

Yes

Yes

Fan Operating

TROUBLESHOOT ENDS.

No

If problems persist, contact ROBERTS GORDON® at Tel: +44 (0) 1902 498733 or www.rg-inc.com

Yes	Are fan belts	No	Is fan/motor rotation	No	Transpose two incoming
	loose or broken?		correct?		phase connections.
	Yes
	Replace or tighten belts.

Relay R1 faulty.

No Replace.

No	Does fan run at cooling		No	Relay R2 faulty.
	stage 1 (T11 live)?			Replace.
	Yes
	Does fan run at cooling	No	Relay R3 faulty.
	stage 2 (T12 live)?			Replace.

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

Conduct Commissioning procedure as on Page 21, Section 11

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