Tjernlund GPAK-JT,1T 8504034 Rev 11/97 - Manual (Page 12)

11
SYMPTOM 1: POWER VENTER DOES NOT RUN DURING CALL FOR HEAT
Step 1.2
Interlocked directly with gas valve
Check for loose connections between appli-
ance and Power Venter.
Interlocked with thermostat at furnace
Contact T-Stat manufacturer for further
assistance
24V
24Volts
Not Present
No
No
Solution: Contact appliance manufacturer
for further assistance
Step 1.1
Interlocked directly with gas valve
Verify 24V across appliance control such
as (Aquastat B1/B2), (Intermittent Ignition
Module MV - MV/PV), or (Standing Pilot
TH - Hot & TR - Common) during call for
heat.
Interlocked with thermostat at furnace
Verify 24V across R & C on furnace ter-
minal strip.
Step 2.
Remove 115V power source to
the Power Venter. Remove
the two BLACK leads from the
Relay and connect them
together. Reestablish 115V.
Result: Power Venter runs
continuously.
Solution: Replace Relay/Timer
(GPAK-JT/1T) Part # 950-0014
non-adjustable or Part # 950-1067
adjustable Relay/Timer or for
(GPAK-J/1) Ice Cube Relay
Part # 950-1040
24V
Solution: Replace Power Venter Motor.
Part # 950-1020
Yes
Step 1.
Activate thermostat to call for
heat. Check for 24V across
terminals 4 and 5 of the
Relay/Timer (GPAK-JT/1T) or
the coil of Ice Cube Relay with
the BLUE and ORANGE leads
attached (GPAK-J/1).
SYMPTOM 2: POWER VENTER RUNS CONTINUOUSLY / ERRATICALLY
No
Solution: Replace Relay/Timer (GPAK-JT/1T) Part # 950-0014
non-adjustable or Part # 950-1067 adjustable Relay/Timer or for
(GPAK-J/1) Ice Cube Relay Part # 950-1040
Solution: Contact the appliance manufac-
turer for further assistance
Step 3.
Reinstall the ORANGE wire on Relay. Verify thermostat is not calling for heat.
Interlocked directly with gas valve
Check for 24V across appliance control such as (Aquastat B1/B2), (Intermittent
Ignition Module MV - MV/PV) or (Standing Pilot TH - Hot & TR - Common).
Interlocked with thermostat at furnace
Check for voltage across W & C at thermostat.
No call for heat
Contact Tjernlund Products, Inc. for
additional assistance.
24 Volts present
Step 1.
Confirm that thermostat is not
calling for heat.
Step 2.
With the Power Venter running, remove the ORANGE wire
on Relay/Timer terminal #5 (GPAK-JT/1T) or the ORANGE
wire from Ice Cube Relay (GPAK-J/1).
Result: Power Venter should shut off within approximately 45
seconds (GPAK-JT/1T). Power Venter should shut off imme-
diately for GPAK-J/1.
Yes
24 Volts not present