Wing Enterprises IOMWDF-1 Troubleshooting Guide, Series 14 Discharge Temperature Control

United Technologies Electronics Controls

Operation of the Series 1016-400 Direct Spark

Ignition Control

On a call for heat a five second pre-purge is initiated. Upon completion of the pre-purge, the gas valve and 60 Hz spark are energized. When flame is detected, the con- trol enters the steady state heating condition. Steady state heating will continue until the call for heat is satisfied.

If ignition is not achieved within 15 seconds, the control shuts off the gas and locks out. If the trial for ignition has been accomplished without ignition, the control shuts off

all outputs and enters lockout. Reset is accomplished by cycling the power off for a minimum of 5 seconds.

If flame is lost once it has been established, the control will shut off the gas valve within 0.8 seconds and locks out.

If flame is sensed during a purge period when no flame should be present, the control will remain in purge with the gas valve off until the false flame disappears.

If the gas valve is found to be powered when it should be off, or not powered when it should be on, the control will enter lockout with all outputs off. Reset is accomplished by cycling the power off for a minimum of 5 seconds.

TROUBLESHOOTING GUIDE

Series 14 Discharge Temperature Control				Reproduced with permission from Maxitrol® Company
Symptom		Possible Cause		Field Test		Remedy
A. No Gas Flow			1.	Arrow on side of valve	1.	Install properly.
	1. Modulating valve
		improperly installed (or		should point in direction
		see Symptom “L”).		of gas flow.
B. Continuous Low	1.	Short circuit or no	1.	Check for 24V AC at	1.	Prove the power source.
Fire (Electronics		voltage to the amplifier.		amplifier terminals 7 & 8.	2.	Tighten connections or
Problem)	2.	Open circuit in TD114	2.	Inspect for loose or
		Remote Temperature		broken wires between		replace wiring.
		Selector circuit or wiring.		amplifier terminals 1 & 2
				and TD114 terminals 1 & 3.	3.	If modulating voltages are
	3.	Short circuit in TS114	3.	Connect test resistor as
		Discharge Air Sensor		described in Preliminary		obtained, check TS114
		circuit of wiring.		Circuit Analysis in Section		circuit for shorts. Replace
				IX. Follow procedures		TS114 if necessary.
				outlined.	4. If items B1-3 check out, and
	4.	Faulty amplifier.	4.	Check items B1-3.
						modulating voltages are still
						not obtained, amplifier may
						be assumed faulty. Replace.
C. Continuous Low	1.	Short circuit or open	1.	Measure resistance across	1.	Replace modulator head if
Fire (Electronics		circuit in Modulator		modulator terminals with		not approximately 45-55
OK).		Coil.		connecting wires detached.		ohms for M611 Valve and
						60-80 ohms for MR212 Valve.
	2.	Plunger missing, jammed,	2.	Inspect. Plunger should be	2.	Clean or replace plunger if
		or improperly installed.		installed to operate freely in		necessary.
				solenoid sleeve.
D. Incorrect Minimum	1.	Incorrect by-pass	1.	See valve adjustments in	1.	Adjust to proper minimum
Fire Erratic or		metering valve		Section IX.		fire.
Pulsating Flame		adjustment.			2.	If reading is greater than 1.5”
	2.	Excessive negative	2.	Close main gas supply and
		burner pressure.		measure manifold pressure		negative pressure, check for
				with blower operating.		clogged filters or other inlet
				Reading should be less than		air restrictions. Consult
				1.5” W.C. negative pressure.		factory for other solutions.

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