User manual TJERNLUND WHKI MILLIVOLT APPLIANCE INTERLOCK (RECOMMEND WHKE FOR USE WITH UC1) 8504055 REV 3 0491

[. . . ] The new style switch is compatible with any previous Old-Style Switch installations. Qty (1) gas pressure switch Qty (1) 1/8-NPT black pipe tee Qty (2) #10 x ½" self-tapping screws Qty (1) 1/8-NPT pipe plug Qty (2) brass 1/8-NPT male x ¼" compression fitting (Only (1) included in 950-2080 kit) Qty (1) section of ¼" outside diam. aluminum tubing (Not included in 950-2080 kit) NEW STYLE GAS PRESSURE SWITCH INSTALLATION The gas pressure switch is mounted on the casing of the water heater adjacent to the heater's thermostat/gas control valve. It should be mounted close enough so that the supplied 1/4" tubing will reach from the gas pressure switch fitting to the thermostat/gas valve pressure tap port. [. . . ] DIAGRAM H DIAGRAM I DIAGRAM J DIAGRAM K DIAGRAM L DIAGRAM M 4 5. Connect the WHITE lead from the WHK-2 to the WHITE motor lead. Secure with a wire connector, (See Diagram N). NOTE: When using the HSUL or GPAK Series for a water heater only, the ORANGE, YELLOW and BLUE wires in the Power Venter are not used. Skip to Page 8, "24 VAC Connection To Water Heater Controls". DIAGRAM N 115 VAC INTERLOCK WITH HST, GPAK-T POWER VENTERS OR DRAFT INDUCER WITH 950-1067 RELAY/TIMER 1. Remove the BLACK motor lead from terminal BLK MTR of the Venter Relay/Timer, (See Diagram O) 2. a) Cut off the female quick connect, (Diagram P). b) Strip the insulation back approximately 1/2", (Diagram Q). c) Connect this lead to the GRAY pigtail lead from the WHK-2. Secure with a wire connector, (Diagram R). Push the new GRAY quick connect back onto terminal BLK. WHK-2 SAFETY OPERATION: If the Venter fails to operate, flue gas spillage will occur from the water heater draft hood. The heat from the flue gas will cause the Linear Limit switch to open, opening the circuit to the Solenoid Valve. The Solenoid Valve will close disrupting the gas supply to the water heater. OPERATIONAL NOTES: The BLACK wire from the WHK-2 is always "hot" and is not used if venting a water heater only. If common venting two appliances, the venter will only post purge with the water heater. 6 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. 7 WHK-2 CONNECTED TO AN SS1 (FURNACE OR BOILER AND WATER HEATER COMMON VENTED) 24 VAC CONNECTION TO WATER HEATER CONTROLS Route the 25' control cable to the water heater. Route control cable back to the heater controls along the ceiling or joists, taking care not to come closer than 6" to the vent pipe or any other potentially hot surface. In many cases, the gas supply piping can be used as a routing path from the ceiling down to the controls, using the supplied nylon ties to secure the cable. NOTE: If the distance between the WHK-2 Control Module and the heater controls is greater than the length of the cable, splice a section of 3 conductor PVC sheathed, 105 degree C thermostat cable to the supplied cable. Make sure the colored leads remain consistent. ACTUATING AND SAFETY CONTROL CIRCUIT CONNECTIONS 1. [. . . ] This warranty covers defects in material and workmanship. This warranty does not cover normal maintenance, transportation or installation charges for replacement parts or any other service calls or repairs. This warranty DOES NOT cover the complete WHK-2 if it is operative, except for the defective part. will issue credit or provide a free part to replace one that becomes defective during the one year warranty period. [. . . ]