Tjernlund HST_HS115_HSUL-JC, 1C, 2C Canadian Series (Discontinued) 8504017 Rev 1 09/97 - Manual (Page 16)

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POWER VENTER AIR FLOW DAMPER ADJUSTMENT
The Air Flow Damper Adjustment on the Power Venter is factory set for maximum air flow. Operating a properly sized Power Venter at
its maximum setting will assure that combustion gases are safely removed to the outside. If the Power Venter has excess venting
capacity than what is required for this application, operating the Power Venter with the air-flow adjustment at the maximum setting
may draw more dilution air than necessary.
The Air Flow Damper Adjustment may be set by use of a combustion analyzer, inclined manometer or draft gauge. Alternatively, the
damper adjustment can be set using a smoke candle or taper, as follows:
1. With all exhaust fans operating, air inlets closed and all appliances firing
(as instructed above), hold a lighted match or taper around the edge of the
relief opening of the draft hood(s) or barometric draft control, (See Diagram I).
2. Set Air Flow Adjustment by loosening locknut and turning damper rod
handle. CAUTION: HANDLE MAY BE HOT, use pliers to move handle.
Position of rod handle indicates the position of Air Flow Adjustment inside
housing, (See Diagram J).
3. Using pliers, move handle towards minimum draft setting until spillage is
detected at draft hood relief opening, then re-open Air Flow Adjustment just
enough to eliminate spillage.
4. Lock Air Flow Adjustment at desired setting by tightening locknut.
5. Return doors, windows, exhaust fans, fireplace dampers and appliances to their previous conditions of use.
COMBUSTION AIR
Adequate combustion air is vital for proper combustion and for safe venting. Likewise, for proper Power Venter 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 local or national codes. Tjernlund’s IN-FORCER
TM
Combustion Air Intake Systems provide a convenient interlocked way to provide combustion air to the equipment room. When
installing a Power Venter it is not necessary to supply any more combustion air than normally required when conventional venting.
Common symptoms of inadequate combustion air include: Fan Proving Switch short cycling, odor present at end of burner cycle, out-
side air enters the structure through the Power Venter during appliance off cycle.
HST SERIES POST PURGE TIMER ADJUSTMENT
1. Disrupt 115 VAC power to the Power Venter.
2. Loosen the two screws and remove junction box cover.
3. The post purge Relay/Timer is marked adjustable delay control. The adjustment is made by turning the small slotted screw. Turn it
counter clockwise to increase the delay, clockwise to decrease the delay. Nominal adjustment range is 1 to 10 minutes. NOTE:
Do not overturn adjustment on Relay/Timer. This will damage Relay/Timer and void warranty.
MAINTENANCE
1. Oil motor every six months with 2 drops of S.A.E. #20. The oil ports are located on the top ends of the motor. Magnetek motors
on the HSJ and HS1 Series do not need to be oiled.
2. The end-user must semiannually inspect the Vent Hood and vent pipe for blockage, corrosion and leaks.
3. 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.
TROUBLESHOOTING
The following guide is intended to be used if a problem occurs during the use of the Power Venter. At several steps throughout the
guide you will be required to measure 115 Volts with a voltmeter. Extreme caution must be exercised to prevent injury. If you are
unable to determine the defective part with the use of this guide, call your Tjernlund distributor or Tjernlund Products direct at
1-800-255-4208 for further assistance.
DIAGRAM J