Wing Enterprises IOMWDF-1 Troubleshooting Guide, Series 44 Room Temperature Control continued

TROUBLESHOOTING GUIDE

Series 44 Room Temperature Control continued				Reproduced with permission from Maxitrol® Company
Symptom		Possible Cause		Field Test		Remedy
E. continued	3.	Incorrect space	3.	Follow procedures outlined	3.	If proper action is obtained,
		temperature calibration.		in “Preliminary Circuit		first check item E2.
				Analysis” in Section IX.		Recalibrate if necessary.
F. Incorrect	1.	Improper TS144	1.	Compare sensed	1.	Move TS144 to location
Maximum or		location.		temperature reading at		where average temperature
Minimum				TS144 with average		can be sensed.
Discharge Air				discharge air temperature.
Temperature.	2.	Incorrect discharge	2.	Follow procedures outlined	2.	If proper temperatures are
		air temperature		in “Preliminary Circuit		not observed, refer to
		calibrations.		Analysis” in Section IX.		Discharge Air Temperature
						calibration procedures.
G. Continuous High	1.	Foreign material	1.	Remove bottom plate and	1.	Clean, replace valve and/or
Fire (Electronics		holding valve open.		inspect valve and seat.		seat if necessary.
OK).	2.	Plunger jammed.	2.	Inspect. Plunger should	2.	Clean, or if necessary,
				be smooth and clean and		replace plunger
				operate freely in solenoid
				sleeve.
H. Continuous High	1.	Open circuit in TS144.	1.	Measure resistance per	1. If readings are incorrect,
Fire (Electronics				item C3.		replace the TS144 or repair
Problem).						wiring.
I. Incorrect High Fire	1.	Inlet pressure too low.	1.	Read inlet pressure at valve	1.	Increase inlet pressure if
				using manometer with		possible or change to larger
				heater operating at full fire.		valve. Consult factory
				Pressure should be at least		about possibility of using
				equal to the sum of: outlet		special spring to reduce
				pressure setting and		pressure drop on selected
				pressure drop of the valve		installations.
				plus 1.0” W.C.
	2.	Incorrect outlet	2.	Read outlet pressure using	2.	See Valve Adjustments in
		pressure adjustment.		manometer and compare		Section IX.
				with the pressure stated
				on the specification plate.
J. Continuous	1.	Faulty amplifier.	1.	Follow procedures outlined	1.	If amplifier is proven at
Maximum Discharge				in “Preliminary Circuit		fault, install replacement
Air Temperature.				Analysis” in Section IX.		amplifier.
	2.	Open circuit in T244	2.	Measure resistance per	2.	If reading is incorrect,
		or TS244/TD244.		item E2.		replace T244,
						TS244/TD244 or repair
						wiring.
	3.	Incorrect space	3.	Follow procedures outlined	3.	If proper action is obtained,
		temperature calibration.		in “Preliminary Circuit		first check item J2.
				Analysis” in Section IX.		Recalibrate if necessary.
K. Burned out	1.	Short in modulator coil	1.	Measure resistance per	1.	If proper resistances are
Transformer. No		circuit.		item B1.		not observed, replace
Voltage to Amplifier.						modulator head or repair
						wiring.

Control circuits external to Series 44 can cause burner malfunction. Always check manual valve to be certain gas is on, and check limit controls for normal operation.

15