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

Page 13

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.

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.

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.

Yes

Wiring not correct

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

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