Tjernlund PAI-3,4,5,6,7 Commercial Combustion Air In-Forcer 8504036 Rev A 05/01 - Manual (Page 14)

13
No Yes
SYMPTOM 3: IN-FORCER WILL NOT RUN ON CALL FOR HEAT (24 VAC CONTROL CIRCUIT)
Step 3.
With thermostat calling for heat, measure for 24 volts
across the ORANGE “coil common” and BLUE “ coil
hot” terminals on IN-FORCER relay.
Result: Measure 24V.
Yes
Yes
Solution: Contact
appliance / thermostat
manufacturer for further
assistance.
Note: For further assistance contact Tjernlund Products, Inc.
Technical Customer Service Department at 1-800-255-4208.
Step 4.
Caution: Disconnect the 115 volt power supply to the IN-
FORCER before attempting the following procedure.
a) Remove the two BLACK leads from contact side of relay and
connect them together.
b) Reestablish the 115 volt power source to IN-FORCER.
Result: IN-FORCER should run constantly.
Measure voltage on thermostat
or aquastat when calling for
heat. Result: Measure 24 Volts.
Contact appliance manufacturer
for further assistance.
High Limit
will not reset
Replace high limit.
Part # 950-0477.
No
Solution: Replace IN-FORCER relay.
PAI-3/4/5/6
950-1040
PAI-7 950-1016
No
Solution: Replace IN-FORCER motor.
PAI-3 950-1020
PAI-4 950-1021
PAI-5 950-1022
PAI-6 950-0131
PAI-7 950-1017
Wiring not correct
SYMPTOM 1: IN-FORCER RUNS BUT BURNER DOES NOT FIRE (115 VAC CONTROL CIRCUIT)
II5 VAC CONTROL CIRCUIT
Step 1.
Recheck all wiring per the installation instructions.
Step 3.
Repeat step 1 & 2 or contact Tjernlund Products
for further assistance.
Wiring correct
Yes
Solution: Rewire the IN-FORCER per the
installation instructions or contact Tjernlund
Products for further assistance.
Note: For further assistance contact Tjernlund Products, Inc.
Technical Customer Service Department at 1-800-255-4208.
Step 2.
With the appliance calling for heat and the
IN-FORCER running, check for voltage
across YELLOW of the Fan Prover and L2.
Result: Measure 115 volts.
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
Contact Tjernlund Products
for further assistance.
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.
Wiring not correct
Step 1.
Recheck all wiring per the installation instructions. Solution: Rewire the IN-FORCER per the instal-
lation instructions or contact Tjernlund Products
for further assistance.
Yes
Step 2.
CAUTION: With 115 volt circuits disconnected to IN-FORCER
remove the BLACK leads from high limit switch located on
inside of PAI cabinet. Check for continuity across high limit.
If circuit is closed put leads back on limit and proceed to Step 3.
If circuit is open push reset button on high limit switch and put
leads back on limit. Investigate possible cause for high limit cut
out. Reestablish 115 VAC power to IN-FORCER. Result: IN-
FORCER motor should run upon a call for heat.
IN-FORCER will not run.