Wing Enterprises IOMWDF-1 - Manual (Page 14)

14
Symptom Possible Cause Field Test Remedy
1. Valve improperly
installed.
1. Open circuit in
modulator coil.
2. Plunger missing, jammed
or improperly installed.
3. Ruptured main or
balancing diaphragm.
1. No voltage to the
amplifier.
2. Short in modulator coil
circuit.
3. Short in TS144 circuit.
4. Faulty amplifier.
1. Incorrect by-pass metering
valve adjustment.
2. Excessive negative
burner pressure.
1. Faulty amplifier.
2. Short in T244 or
TS244/TD244 circuit.
1. Arrow on side of valve
should point in direction
of gas flow.
1. Remove wires connected
to amplifier terminals 6 &7
and measure resistance.
MR212 (60-80 ohms), M611
(45-55 ohms).
2. Inspect. Plunger should be
installed to operate freely in
solenoid sleeve.
3. Disassemble valve for
inspection of internal parts.
1. Check for 24V AC at
amplifier terminals 8 & 9.
2. Measure resistance per
item 2.
3. Remove wires connected to
amplifier terminals 1, 2 & 3.
Measure resistance across
wires 1 & 3. Meter should
read greater than 2500 ohms.
4. Follow procedures outlined
in “Preliminary Circuit
Analysis” in Section IX.
1. See Valve Adjustments -
Section IX.
2. Close main gas supply and
measure manifold pressure
with blower operating.
Should be less than 1.5”
W.C. negative pressure.
1. Follow procedures outlined
in “Preliminary Circuit
Analysis” in Section IX.
2. Remove wires connected
to amplifier terminals 4 & 5.
Set T244 or TD244 to max-
imum setting. Measure
resistance across wires.
Meter should read 6000
ohms ± 1000 (T244). If
TS244/TD244 are used,
meter should read 4500
ohms ± 1000 (TS244) and
2100 ohms ± 150 (TD244).
1. Install properly.
1. If proper resistance values
are not observed, replace
modulator head or repair
wiring.
2. Clean or replace plunger is
necessary.
3. Replace diaphragm if
ruptured.
1. Provide 24V AC to amplifier.
Refer to item K1.
2. If proper resistance values are
not observed, replace the mod-
ulator head or repair wiring.
3. If readings are incorrect, replace
the TS144 or repair wiring.
4. If power source and
modulator coil check out
(items 5 & 6) but proper
modulating voltages cannot
be obtained, then amplifier
may be assumed at fault.
Install replacement amplifier.
1. Adjust to proper low fire.
2. If greater than 1.5”
negative pressure, check
equipment for clogged
filters and other inlet air
restrictions. For other
solutions, consult factory.
1. If amplifier is proven at fault,
install replacement amplifier.
2. If reading is incorrect, replace
The T244,TS244/TD244 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.
A. No Gas Flow.
B. Continuous Low
Fire (Electronics
OK).
C. Continuous Low
Fire (Electronics
Problem).
D. Incorrect Low Fire.
E. Continuous
Minimum Discharge
Air Temperature.
TROUBLESHOOTING GUIDE
Series 44 Room Temperature Control Reproduced with permission from Maxitrol® Company