– 22 –
TROUBLESHOOTING GUIDE
Series 14 Discharge Temperature Control
continued
Reproduced with permission from Maxitrol
®
Company
Symptom Possible Cause Field Test Remedy
1. Foreign object holding
valve open.
2. Plunger jammed.
1. Inlet pressure too low.
2. Incorrect outlet
pressure adjustment of
Pressure Regulator.
1. Hunting.
2. Erratic air patterns or
improper TS114
location.
3. Wiring is run next to
high voltage switching
circuits causing
induced voltages.
4. Faulty Amplifier or
erratic voltage supply.
1. Remove bottom plate and
inspect valve and seat.
2. Inspect. Plunger should be
smooth and clean and
operate freely in solenoid
sleeve.
1. Read pressure at inlet to
modulating valve using a
manometer with unit
operating at full fire.
Pressure should be equal
to the sum of outlet
pressure setting plus
pressure drop of the valve.
2. Read manifold pressure
using manometer and
compare with the pressure
stated on the specification
plate.
1. Adjust sensitivity control
counter-clockwise.
2. Connect test resistor as
described in Preliminary
Circuit Analysis. Turn
TD114 selector dial so
heater goes through its
entire modulating range.
3. Temporarily wire each
TD114, TS114 and MR212
externally and observe
heater/equipment
operation.
4. With test resistor con-
nected (per Item #18) and
TD114 locally connected
(per Item #19) turn TD114
selector dial through entire
modulating range.
Observe D.C. voltage
across modulator
terminals.
1. Clean seat. Clean valve or
replace if necessary.
2. Clean, or if necessary,
replace plunger.
1. Increase inlet pressure if
possible.
2. See valve adjustments in
Section IX.
1. If flame stabilizes, adjust
sensitivity control to
maintain an even flame.
2. If the flame is steady
throughout the entire
modulating range, the
TS114 must be moved.
3. If smooth operation results,
isolate effected wiring from
source of induced voltage.
4. If erratic or unstable D.C.
voltages are obtained
throughout the modulating
range, the amplifier may
be assumed faulty.
Replace. If erratic oper-
ation is noted only over a
small range of 2 or 3 volts
the voltage sources may
contain surges. Consult
factory for other solutions.
F. Continuous
High Fire
(Electronics
OK).
G. Incorrect
Maximum Fire.
H. Erratic or
Pulsating
Flame.
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