Tjernlund HST_HS115_HSUL-JC, 1C, 2C Canadian Series (Discontinued) 8504017 Rev 1 09/97 User Manual
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SYMPTOM 3: POWER VENTER RUNS BUT APPLIANCE DOESN’T (HSUL & HST SERIES ON GAS )
No
Bad
Tube
Wheel
Dirty
Contact your whole-
saler for replacement
tube.
Clean Power Venter Wheel.
Supply ade -
quate combus-
tion air, proper
Power Venter or
reduce vent pipe
length.
Step 2.
Remove the BLUE and YELLOW wires from
Power Venter Proving Switch. Activate ther -
mostat to call for heat. With Power Venter
running, check for continuity across the COM
and N/O terminals of Fan Proving Switch.
Result: Contacts on switch should be closed.
No call for heat
Contact Tjernlund Products, Inc. for
additional assistance.
Step 1.
Confirm that thermostat is not
calling for heat.
Step 3.
Replace BLUE to COM and YELLOW to N/O on Fan Proving Switch.
Confirm that leads from Fan Prover are connected as follows:
Interlocked directly with gas valve
YELLOW wire is connected to the TH (HOT) on gas valve and BLUE
is connected to appliance control (Aquastat B1), (Intermittent Ignition
Module MV) or (Standing Pilot TH - Hot ).
Interlocked with thermostat at appliance
YELLOW wire connected to W on furnace terminal strip and BLUE is
connected to W from T-Stat.
Yes
Yes
Step 2.3
Confirm adequate combustion air is present in
appliance location, Power Venter is sized properly
for application and vent runs do not exceed maxi-
mum length. Make sure vent isn’t blocked.
Solution: Replace Fan Proving
Switch Part #’ s
HSJ
950-1030
HS1
950-1030
HS2 950-1031
Step 2.2
Examine Power Venter wheel
for particulate build-up.
Tube Ok
Yes
Wheel Clean
No
Step 2.1
Examine Fan Prover sensing tube for
kinks, misalignment or blockage. Sensing
tube should be at an approx. 90 degree
angle to wheel.
GAS
SYMPTOM 1: POWER VENTER RUNS BUT BURNER DOES NOT FIRE (HST SERIES ON OIL)
Step1.
Activate appliance to call for ignition. At
this time the Power Venter should be run-
ning. 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
Step 3.
Contact Tjernlund Products, Inc. for
additional assistance.
Step 1.1
Examine the Fan Prover Sensing Tube for
kinks, mis-alignment or blockage.
Step 1.2
Examine blower wheel for particulate
buildup or a closed discharge damper.
Step 1.3
Confirm that adequate combustion air is
present in appliance location and Power
Venter is sized properly for the application.
Make sure vent isn’t blocked.
Solution: Contact Tjernlund Products, Inc.
for further assistance.
Solution: Clean or replace blower wheel
or open discharge damper.
Solution: Contact your wholesaler for a
replacement Fan Prover Sensing Tube.
Step 2.
Confirm that YELLOW wire from Fan
Prover is connected to the BLACK of the
burner motor.
NO
NO
NO
Yes
Yes
Yes
Yes
Yes
OIL