Tjernlund WHK-2 Millivolt Interlock Kit (Discontinued - Not Compatible with UC1) 8504026 Rev 8 09/98 - Manual (Page 6)

WHK-2 WATER HEATER CONTROL MODULE INSTALLATION AND 115 VAC WIRING
NOTE: If 115 VAC has already been wired into the Power Venter/Draft Inducer, discon-
nect and follow the appropriate 115 VAC wiring instructions shown on pages 4-6 of this
manual.
1. The WHK-2 Control Module must be mounted within 2 feet of the Power Venter/Draft
Inducer. Mount by removing the box cover and securing to wall or ceiling by screwing
the provided fasteners through the two holes in the bottom of the module. Verify that
there is a 115 VAC grounded outlet within 6 feet of the module.
2. Loosen the hex head screws and remove the electrical box cover of the Power
Venter/Draft Inducer.
3. Connect the conduit from the WHK-2 to the hole marked 115VAC of the Power
Venter/Draft Inducer. Secure by means of the lock nut.
4. Connect the GREEN ground lead from the WHK-2 module to the GREEN ground
wire of the motor. Secure with wire connector, ( See Diagram G).
NOTE: The rest of the 115V electrical interlock between the WHK-2 and the Power Venter/Draft Inducer will vary depending on which
model Power Venter/Draft Inducer you are using. If interlocking the WHK-2 to a SideShot, refer to page 8 of these instructions for
wiring details. 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. (The terminal numbers will vary with different
relay manfacturers. It will always be either #3 or #4 of the Relay, (See Diagram H).
2. a) Cut off the female quick connect, (Diagram I). b) Strip the insulation back approximately 1/2”, (Diagram J). c) Connect this
lead to the GRAY pigtail lead from the WHK-2. Secure with a wire connector, ( See Diagram K).
3. Push the new GRAY quick connect back onto either terminal #3 or #4 of the Venter Relay, (See Diagram L).
4. Connect the BLACK lead from the WHK-2 to the remaining BLACK lead of the Venter Relay. Secure with wire connector, (See Diagram M).
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.
4
DIAGRAM G
DIAGRAM H
POWER VENTER/DRAFT INDUCER
ELECTRICAL BOX
DIAGRAM I
DIAGRAM K
DIAGRAM J
DIAGRAM L
ALL DIAGRAMS BELOW SHOW AN HSUL, GPAK - SERIES POWER VENTER OR DRAFT
INDUCER ELECTRICAL BOX WITH 950-1040 24/115 VAC RELAY.
DIAGRAM M