DF Series installation manual
27
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MAXITROL TROUBLESHOOTING CHECK LIST
SYMPTOMS
POSSIBLE CAUSE
ON-SITE CHECK
ACTIONS
ERRATIC OR PULSATING
FLAME
17. Signal instability (hunting)
18. Air turbulence or TS114
installed in improper location
19. Control system wiring running
along high voltage wires, causing
induction
20. Faulty amplifier or incorrect
input voltage
17. Adjust the amplifier sensitivity
counter clockwise.
18. Follow step 4. Turn the TD114
button to check the entire
modulation range.
19. Temporarily connect the
TD114, TS114 and MR212 with
new wires. Observe the burner
operation.
20. Follow step 18. Note the DC
voltage at the amplifier terminals.
17. If the flame is unstable, adjust
the sensitivity of the amplifier to
obtain an even flame.
18. If the flame remains unstable
over the entire modulation range,
change the location of the TS114.
19. If normal operation is
restored, isolate the affected
wires from the wires causing
induction.
20. If the DC voltage is unstable
over the entire modulation range,
replace the amplifier. If unstable
operation is noted over a small
part of the range (2 or 3 volts
only), this might indicate the
occurrence of surges. Refer to the
Maxitrol manufacturer.
INCORRECT DISCHARGE
AIR TEMPERATURE
21. Incorrect wiring
22. System improperly adjusted
23. Air stratification
24. The room thermostat controls
the burner.
21. Check the electric
connections.
22. The temperature sensed by
the TS114 does not correspond to
the TD114 setting.
23. The temperature sensed by
the TS114 does not correspond to
the desired average discharge air
temperature.
24. Disconnect the room
thermostat from terminal 2 of the
TD114.
21. Correct wiring.
22. Adjust the TD114.
23. Move the TS114 to a location
where the temperature
corresponds to the desired
average temperature.
24. Make sure that the
temperature corresponds to the
TD114 set point. Check the room
thermostat setting and check
wiring for short circuits.
BURNT OUT
TRANSFORMER
25. Short circuit in the amplifier
coil
26. Short circuit between the
amplifier and the modulating
valve
25. Check the resistance of the
modulating valve head (with red
wires disconnected on the
MR212).
26. Check wiring.
25. Replace the modulating valve
head if the resistance is under 40
ohms.
26. Correct the wiring if a short
circuit is found.
DISCHARGE AIR
TEMPERATURE TOO LOW
WHEN THE ROOM
THERMOSTAT CONTROLS
THE BURNER
27. Second temperature set point
too low
28. Insufficient burner capacity
27. Check the setting of the
second control point inside the
TD114.
28. Make sure that the heater
operates at high fire and that the
gas inlet pressure corresponds to
the manufacturer’s specifications.
27. Set at desired temperature.
28. If the heater operates at high
fire, the control signal cannot be
increased. The burner may not be
of sufficient capacity to provide
the desired temperature rise.
NO REACTION FROM THE
MODULATING VALVE
WITH 20 VDC BETWEEN
TERMINALS 3 AND 4
29. Faulty modulating valve
30. Broken wires between the
amplifier and the modulating
valve
29. Read voltage directly on the
modulating valve; if 24 VDC, the
valve is faulty.
30. Read voltage between
terminals 5 and 6 of the amplifier;
if 24 VDC, check for broken wires
leading to the modulating valve.
29. Replace modulating valve.
30. Correct wiring.
