FloAire FAV-M - Manual (Page 39)

39
Symptom Possible Cause Field Test Remedy
Incorrect minimum or
maximum discharge
air temperature Improper TS144 location
Incorrect discharge air
temperature control calibration Compare sensed temperature
at TS144 with average
discharge air temperature
Refer to the preliminary circuit
analysis section Move TS144 to location
where average
temperature can be
sensed
If proper temperatures
are not observed, refer
to control calibration of
this manual
Continuous high fire
(electronics problem) Open in TS144 circuit
Remove wires to amplifier
terminals 1, 2, and 3.
Measure resistance between
terminals 1 and 3, then
between terminals 2 and 3.
Meter should read greater
than 2500 ohms If readings are incorrect,
replace TS114 or repair
wiring
Continuous high fire
(electronics OK) Foreign material holding valve
open
Plunger jammed Remove bottom plate and
inspect valve and seat
Inspect: plunger should be
smooth and clean, and
operate freely in solenoid
valve Clean and replace valve
and seat. Replace if
necessary
Clean, or if necessary,
replace plunger
Incorrect high fire Inlet pressure too low
Incorrect outlet pressure
adjustment With heater operating at full
fire, take pressure reading at
inlet to modulation valve.
Pressure should meet or
exceed the units minimum gas
pressure
Read outlet pressure using a
manometer and compare with
recommendation of unit
capacities Increase inlet pressure if
possible, or change to a
larger modulation valve.
Contact manufacturer for
increasing valve size.
See control calibration of
this manual
Continuous maximum
discharge air
temperature Defective amplifier
Open in T244 or TS244/TD244
Incorrect space temperature
control calibration Refer to the preliminary circuit
analysis section
Remove wires to amplifier
terminals 4 and 5. Set T244
or TD244 to maximum setting.
Measure resistance across
wires. Meter should read
6000 ohms +- 1000 ohms. If
TS244/TD244 are used, meter
should read 4500 ohms +-
1000 (TS244) and 2100 ohms
+- 150 (TD2440)
See control calibration section
of this manual Replace amplifier if
defective
If reading is incorrect,
replace T244,
TS244/TD244 or repair
wiring
If proper action is
obtained, see calibration
section of this manual