Tjernlund GPAK-J,JT,1,1T (Discontinued) 8504013 Rev 3 09/97 User Manual
Page 11
ALTERNATIVE THERMOSTAT WIRING FOR SINGLE ZONE INSTALLATIONS
SEQUENCE OF OPERATION ON PAGE 7 CHANGES AS FOLLOWS WHEN WIRING WITH SINGLE ZONE THERMOSTAT:
Adjust the furnace thermostat to call for heat. The Power Venter should start. After a slight delay, the furnace burner should fire. The
delay is caused by the Power Venter fan proving switch. The delay will be no more than 4 seconds, if you are unable to detect a
slight delay, contact Tjernlund Products, Inc. at 1-800-255-4208 for assistance. When the fan proving switch closes, the furnace com-
bustion 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. DO NOT OPERATE THE FURNACE WITHOUT THE FAN PROVING
SWITCH WIRED INTO THE 24V FURNACE CIRCUIT!
NOTE: When Power Venter is interlocked with thermostat wire all zones, circulators and limits as would normally be done if venting
into a chimney.
If you are unable to wire the GPAK as outlined in these instructions, call Tjernlund’s Customer Service Department toll free at
1-800-255-4208 for fast assistance.
10
WIRING GPAK-J/GPAK-1 WITH THERMOSTAT