17
TROUBLE SHOOTING GUIDES CONTINUED
Electronic-Regulator Continued
SYMPTOM
POSSIBLE CAUSE
FIELD TEST
REMEDY
1. Heat load requires low fire only.
1. Increase temperature setting 10 degrees.
1. If heater goes to high fire, system is working
correctly.
2. Plunger and/or maximum spring
missing.
2. Check for parts.
2. Install correct parts.
3. Jammed plunger.
3. Examine. Plunger should be clean, smooth, and operate freely in solenoid
sleeve.
3. Clean, or replace plunger if necessary.
4. Other valves faults.
4. Remove wire from MR valve.
4. If MR valve remains on low fire, valve may be
faulty.
5. Inadequate supply pressure.
5. Remove max. adjustment spring from MR valve, push down on plunger.
Insufficient manifold pressure with furnace operating indicates supply is too
low.
5. Check for obstruction in gas pipe ahead of
controls. Increase gas pressure if possible.
H. Incorrect discharge air
temperature.
1. Calibration.
1. Check seal on calibration potentiometer.
1. Recalibrate per “Temperature Calibration”
procedure.
1. Dirty or sticking plunger.
1. Examine. Plunger should be clean, smooth, and operate freely in solenoid
sleeve.
1. Clean or replace plunger if necessary.
2. Loose or broken wiring.
2. Inspect wiring.
2. Correct wiring.
3. Erratic voltage.
3. Observe DC voltage across amplifier terminals 1 and 2.
3. If erratic or pulsating DC voltage is observed and
wiring shows no defects, replace amplifier. If erratic
or pulsating voltage continues, contact Addison.
G. Continuous low or medium
fire, but automatic valve cycles
correctly.
I. Erratic or severely pulsating
flame.
*Control circuits external to the Electronic-Regulator and Amplifier can cause burner malfunction. Always check gas valve to be certain it is turned on, and check limit controls for normal operation.
Содержание B
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