Tjernlund GPAK-1TR 8504047 Rev B 06/14 User Manual
Page 10
OPERATION CIRCUIT CHECK
1. After all furnace and *GPAK-1TR* wiring is complete, establish 115V power to the furnace and Power Venter with the furnace ther-
mostat not calling for heat. NOTE: The Power Venter may operate when power is first established. This is due to any time remain-
ing on Relay/Timer “post-purge” cycle. Power Venter should shut off after approximately 45 seconds. Wait until the Power Venter
shuts off before continuing.
2. Adjust the furnace thermostat to call for heat. At this point, the Power Venter should start. After a delay, the furnace burner should
begin a trial for ignition. When the fan proving switch closes, the furnace combustion relay is energized. Normal combustion
sequence for the furnace begins: Induced draft furnace blower starts, its proving switch makes, energizing ignition control and/or
gas valve.
3. Adjust the furnace thermostat so that no heat is required. At this point the Power Venter and furnace should shut off.
NOTE: The Power Venter will continue to run for approximately 45 seconds after the furnace shuts off.
COMBUSTION AIR
Adequate combustion air is vital for proper combustion and for safe venting. Likewise, for proper *GPAK-1TR* performance, ade-
quate combustion air must be available to the appliance. Many installers assume adequate combustion air is present, especially in
older homes. In some cases this is a false assumption, because many older homes have been made "tight" due to weatherization.
Size the combustion air opening(s) into the appliance room as outlined NFPA 54/NFPA 211. When installing a *GPAK-1TR* it is not
necessary to supply any more combustion air than normally required when conventional venting.
DRAFT ADJUSTMENT / SAFETY INTERLOCK & COMBUSTION AIR TEST
The Power Venter Fan Proving Switch is designed to disable the appliance gas valve upon Power Venter failure only! It is not
designed and cannot replace regular vent system inspection, appliance servicing and combustion testing.
Flue gas flow adjustment
MUST be made to ensure furnace efficiency. This should be done at the furnace exhaust outlet with a draft
gauge. Draft measured between the furnace outlet and the barometric damper is to be set to -0.01” to -0.03” of water.
1. Close all doors and windows of the building. If the appliance is installed in a utility room or closet, close the entrance door to this
room. Close fireplace dampers.
2. Turn on clothes dryer and all exhaust fans such as range hoods, bathroom exhausts and whole house fans to maximum speeds.
(Do not operate a fan used strictly for Summer exhausting)
3. Following the appliance manufacturer’s instructions, place the appliance in operation, set thermostat for continuous operation.
4. Allow fans and appliance to operate for 6 minutes.
5. Test for spillage at the barometric draft control using the flame of a match, candle or smoke from a cigarette, cigar or
pipe and determine that the flame or smoke is being drawn into the barometric control, (See Diagram F).
6. Sign and date these instructions to verify that the safety interlock/combustion air test was completed. These instructions must
remain on premises.
SIGN:____________________________________
DATE:_____________________
MAINTENANCE
1. Oil motor every six months with 2 drops of S.A.E. #20. The oil ports are located on the top of the motor.
Magnetek motors do
not need to be oiled.
2. A vent system inspection must be performed annually by a qualified service agency. The inspection should include the operation
circuit check, safety interlock test, combustion air test and a visual inspection of the complete vent system for corrosion, blockage
or leaks. Any corrosion, blockage or leaks detected must be repaired or replaced immediately.
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PROPER DRAFT
DIAGRAM F
IMPROPER DRAFT