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. [. . . ] If interlocking the WHK-2 to an HS115 Series Power Venter or a Draft Inducer, refer to page 6 of these instructions for wiring details. If interlocking the WHK-2 to an HST, GPAK-T Series Power Venter or Draft Inducer with 950-1067 Relay/Timer, refer to page 5 of these instructions for wiring details. If interlocking the WHK-2 to an HSUL , GPAK Series Power Venter or Draft Inducer with 950-1040 Relay, refer to the steps below for wiring details. 115 VAC INTERLOCK WITH HSUL, GPAK - SERIES POWER VENTERS OR DRAFT INDUCER WITH 950-1040 24/115 VAC RELAY 1. Remove the BLACK motor lead from either terminal #3 or #4 of the Venter Relay. Push the new GRAY quick connect back onto either terminal #3 or #4 of the Venter Relay, (See Diagram L). Connect the BLACK lead from the WHK-2 to the remaining BLACK lead of the Venter Relay. NOTE: This connection allows the Venter to operate independently of the WHK-2 Module through the furnace/boiler control circuit). The BLACK lead is always "hot" when the WHK-2 Module is plugged in. Verify that the BLACK lead is connected to this terminal of the Relay if Venter operates continuously. ALL DIAGRAMS BELOW SHOW AN HSUL, GPAK - SERIES POWER VENTER OR DRAFT INDUCER ELECTRICAL BOX WITH 950-1040 24/115 VAC RELAY. 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. Push the BLACK piggy-back lead from the 6' 18/2 Linear Limit sensing switch cable onto the common terminal of the Gas Pressure Switch, (Diagram V). Push the remaining BLACK lead from the 6' 18/2 sensing switch cable onto one of the terminals on the Solenoid Valve, (Diagram W). Push the YELLOW lead from the 25' control cable onto the remaining terminal on the Solenoid Valve, (Diagram W). [. . . ] 2) Black from WHK-2 should be connected to thin Black wire on Venter Relay. 3) White from WHK-2 should be connected to white Venter motor wire. With the Furnace/Boiler calling for heat, check for 24V on the Blue and Orange wires of Venter Relay. No The Venter is not wired to the Furnace or boiler correctly or malfunction of Furnace/Boiler controls. Rewire per the WHK-2 instructions or contact Furnace/Boiler manufacturer for assistance. [. . . ]