Tjernlund WHK-2 Millivolt Interlock Kit (Discontinued - Not Compatible with UC1) 8504026 Rev 8 09/98 - Manual (Page 9)

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WHK-2 CONNECTED TO AN HSUL, GPAK - SERIES POWER VENTER OR DRAFT INDUCER WITH
950-1040 24/115 VAC RELAY (FURNACE OR BOILER AND WATER HEATER COMMON VENTED)
WHK-2 CONNECTED TO AN HST, GPAK-T SERIES POWER VENTER OR DRAFT INDUCER WITH
950-1067 RELAY/TIMER (FURNACE OR BOILER AND WATER HEATER COMMON VENTED)
NOTE: On the GPAK-T Series the
wire color from terminal # 4 of
Relay/Timer is BLUE. The wire
from terminal # 5 is ORANGE.