User manual TJERNLUND WHK2 MILLIVOLT APPLIANCE INTERLOCK INST. (NOT COMPATIBLE WITH UC1) 8504026 REV A 0600

[. . . ] Discontinued Old-Style Switch TJERNLUND PRODUCTS, INC. 1601 Ninth Street · White Bear Lake, MN 55110-6794 PHONE (800) 255-4208 · (651) 426-2993 · FAX (651) 426-9547 Visit our web site · www. tjernlund. com IMPORTANT: This gas pressure switch is an updated version with only one 1/4" aluminum tubing connection to the pressure tap port of gas valve. The atmospheric vent connection is no longer required, as on the Old-Style Switch. Disregard the "Gas Pressure Switch" installation section of your VP-2/3, WHK-2, WHKE instruction manual if the old style switch is referenced, (See Discontinued Old-Style Switch Diagram). If you are replacing an OldStyle gas pressure switch with the new style gas pressure switch follow the instructions below. [. . . ] NOTE: This connection allows the Venter to operate independently of the WHK-2 Module through the furnace/boiler control circuit. Connect the WHITE lead from the WHK-2 to the WHITE lead connected to terminal L2 of the Venter Relay/Timer and the WHITE motor lead. Secure with a wire connector, (See Diagram U). Skip to Page 8, "24 VAC Connection To Water Heater Controls". 115 ALL DIAGRAMS BELOW SHOW AN HST, GPAK-T POWER VENTER OR DRAFT INDUCER ELECTRICAL BOX WITH 950-1067 RELAY/TIMER. NOTE: GPAK-T RELAY/TIMER MAY LOOK DIFFERENT THAN SHOWN, HOWEVER, TERMINAL DESIGNATIONS ARE THE SAME. DIAGRAM O DIAGRAM P DIAGRAM Q DIAGRAM R DIAGRAM S DIAGRAM T DIAGRAM U NOTE: When using the HST, GPAK-T or Draft Inducer with a 950-1067 Relay/Timer for a water heater only, the wires from the #4 & #5 terminals on Relay/Timer and the YELLOW and BLUE wires from the Fan Proving Switch in Power Venter are not used. 5 115 VAC INTERLOCK WITH HS115 - SERIES POWER VENTERS AND 115 VAC CONTROLLED DRAFT INDUCERS 1. Connect the GRAY wire from the WHK-2 Module to the BLACK 115 VAC motor lead of the Power Venter or Draft Inducer. NOTE: Cut the quick connect and cap with wire connector. Connect the WHITE wire from the WHK-2 to the WHITE wire from the Power Venter or Draft Inducer motor. IMPORTANT: The BLACK wire from the WHK-2 module is not used in these applications. Cut stripped end of this wire and wrap with suitable electrical tape to prevent contact with other live connections in wiring box. NOTE: When using the HS115 for a water heater only, the YELLOW and BLUE wires in the Power Venter are not used. WHK-2 WIRING WHK-2 OPERATION WHK-2 SEQUENCE OF OPERATION: 1. Water heater calls for heat which sends a small amount of gas from the water heater pressure tap to the Gas Pressure Switch. Gas Pressure Switch closes completing the circuit between the WHK-2 Transformer and terminals 4 & 5 of WHK-2 Relay/Timer. When terminals 4 & 5 of the WHK-2 Relay/Timer receive 24V, an internal switch of the WHK-2 Relay/Timer closes between L1 and BLK. sending current to the Gray of the WHK-2 metal conduit. When the water heater thermostat is satisfied the Gas Pressure Switch will open, disrupting 24V to terminals 4 & 5 of the WHK-2 Relay/Timer. of the WHK-2 Relay/Timer remains closed for an adjustable time allowing the Power Venter/Draft Inducer to continue operating. 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. [. . . ] If the part is over 18 months old, proof of date of the installation in the form of the contractor sales/installation receipt is necessary to prove the unit has been in service for under one year. All receipts should include the date code of the WHK-2 to ensure that the defective component corresponds with the complete unit. This will help preclude possible credit refusal. 1. ) Follow troubleshooting guide to determine defective component. [. . . ]