Tjernlund HS-3C Canadian 8504002 Rev 2 09/97 - Manual (Page 9)

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SEQUENCE OF OPERATION FOR HS-3C ON A SINGLE APPLIANCE
The following sequence of operation gives guidance as to how the Power Venter should operate with the appliance.
1. The call for heat will be routed through the Motor Relay and to one side of the Fan Proving Switch. The Power Venter motor is
energized.
2. When the Power Venter has achieved full RPM and maximum draft has been established, the Fan Proving Switch will close
allowing the 24V signal to energize the Isolation Relay coil.
3. When the Isolation Relay contacts close, the 24V signal will then be allowed to reach the gas valve.
DRAFT ADJUSTMENT
DRAFT ADJUSTMENT FOR GAS APPLIANCES EQUIPPED WITH A DRAFT HOOD OR DRAFT DIVERTER
1. With the appliance(s) and Power Venter operating for at least 15 minutes, hold a taper, cigarette or other smoke producing device
at the draft hood or draft diverter.
2. Determine that the smoke is being drawn into the vent system.
3. If the draft appears to be excessive, the damper on the Power Venter may be adjusted to reduce the Power Venter’s performance
as long as the smoke is still being drawn into the draft hood after damper adjustment.
DRAFT ADJUSTMENT FOR GAS APPLIANCES EQUIPPED WITH A BAROMETRIC DRAFT CONTROL
1. With the appliance(s) and Power Venter operating for at least 15 minutes, insert a draft gauge into the vent pipe between the
barometric draft control and the appliance flue outlet.
2. Make necessary draft adjustments with the barometric draft control, appliance burner air intake and the damper located on the
outlet of the Power Venter until the appliance manufacturer’s recommended draft is present.
SAFETY INTERLOCK TEST
1. Adjust the appliance thermostat(s) or aquastat(s) to call for heat.
2. Determine that the Power Venter operates before the gas valve becomes energized.
3. With the appliance(s) and Power Venter operating, disrupt power to the Power Venter and determine that the appliance gas valve
shuts off.
DO NOT OPERATE AN APPLIANCE THAT DOES NOT SHUT OFF WITH THE VENTER DISABLED.
MAINTENANCE
1. Oil every six months with 2 drops of S.A.E. #20. The oil ports are located at both ends of the motor.
2. A vent pipe inspection must be performed annually. The inspection should include checking all vent pipe and connections for
blockage and leaks. A safety interlock test should also be performed.
HOW TO OBTAIN SERVICE ASSISTANCE
1. If you have any questions about your Power Venter or if it requires adjustment, repair or routine maintenance, we suggest that
you contact your installer, contractor or service agency.
2. If you require technical information contact Tjernlund Products, Inc. at 1-800-255-4208.
When contacting Tjernlund Products, Inc., please have the following information available:
1. Model number of the Power Venter
2. Name and address of installer and service agency
3. Date of original installation and dates any service work was performed
4. Details of the problem