Tjernlund PAI-3,4,5,6,7 Commercial Combustion Air In-Forcer 8504036 Rev A 05/01 User Manual
Page 13
12
Wiring not correct
SYMPTOM 1: IN-FORCER RUNS BUT BURNER WILL NOT FIRE (24 VAC CONTROL CIRCUIT)
IN-FORCER WIRED WITH A 24 VAC CONTROL CIRCUIT
Step 2.
With the appliance calling for heat and the
IN-FORCER running, check for voltage
across YELLOW of the Fan Prover and
ORANGE “coil common” of the 24 VAC relay
Result: Measure 24 volts.
Step 1.
Recheck all wiring per the installation instructions.
Step 3. (Wired with gas valve)
With the appliance calling for
heat and the IN-FORCER run-
ning, check for 24 volts across
the TH(HOT) and TR(COM) ter-
minals on appliance gas valve.
Result: Measure 24 volts.
Step 3. (Wired with single
zone gas or oil furnace
terminal strip/fan center)
With the thermostat calling for
heat and the IN-FORCER run-
ning, check for 24 volts across
the W and C(COM) terminals
on appliance terminal strip/fan
center.
Result: Measure 24 volts.
Step 4.
Contact appliance manufacturer for further assistance.
Yes
Solution: Rewire the IN-FORCER per the
installation instructions or contact Tjernlund
Products for further assistance.
No
obstruc-
tions
Solution:Replace
Fan Proving Switch.
PAI-3
950-0476
PAI-4 950-0474
PAI-5/6 950-0472
PAI-7
950-0471
Solution: Clean
intake screen of
clogged material.
Check for excessive
length or sharp
bends in discharge
or inlet vent pipe.
Verifiy fan prover
sensing tube is not
kinked and is prop-
erly connected.
No
No
Solution: Repeat steps 1-3 or contact
Tjernlund Products for further assistance.
Note: For further assistance contact Tjernlund Products, Inc.
Technical Customer Service Department at 1-800-255-4208.
No
Yes
Yes
Wiring not correct
No
SYMPTOM 2: IN-FORCER RUNS CONSTANTLY (24 VAC CONTROL CIRCUIT)
Step 2.
Remove the BLUE “coil hot” wire from relay while
IN-FORCER is running.
Result: IN-FORCER should shut off immediately.
Step 1.
Recheck all wiring per the installation instructions.
Step 3.
Measure for voltage on appliance thermostat or
aquastat when not calling for heat.
Result: Voltage not measured.
Yes
Yes
Step 4.
Contact appliance / thermostat manufacturer for
further assistance.
Yes voltage measured
Solution: Rewire the IN-FORCER per the
installation instructions or contact Tjernlund
Products for further assistance.
Solution: Replace the
IN-FORCER relay.
PAI-3/4/5/6 950-1040
PAI-7
950-1016
No voltage measured
Solution: Repeat step 1-3 or contact
Tjernlund Products for further assistance.
Note: For further assistance contact Tjernlund Products, Inc.
Technical Customer Service Department at 1-800-255-4208.
Activate appliance to call
for ignition. At this time
the IN-FORCER should
be running. Remove the
BLUE and YELLOW leads
on Fan Prover. Check for
continuity across the N.O.
and COM terminals of
the Fan Prover. Result:
Circuit should be closed.
Contact Tjernlund Products
for further assistance.
Yes