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 control 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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