Tjernlund WHK-2 Millivolt Interlock Kit (Discontinued - Not Compatible with UC1) 8504026 Rev 8 09/98 - Manual (Page 13)

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SYMPTOM 2: HSUL, GPAK - SERIES POWER VENTER OR DRAFT INDUCER OPERATES WITH FURNACE OR BOILER NOT
WITH WATER HEATER. BEFORE CONTINUING, THE WHK-2 SHOULD HAVE POWER AND THE FURNACE OR
BOILER SHOULD NOT BE CALLING FOR HEAT.
Repair or replace tubing.
Yes
Yes
Yes Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
Check the WHK-2 Gas Pressure switch tubing for blockage.
Check Water Heater Pressure
tap Port for pressure with the
Water Heater burner on.
Pressure should be present.
Replace WHK-2 Gas
Pressure Switch.
Part #950-2080 Contact Water Heater
manufacturer for assis-
tance.
With the Red, Black and Blue wires jumped at the WHK-2
Gas Pressure Switch, check for 24V at terminals 4 & 5 of the
WHK-2 Relay/Timer.
Replace WHK-2 Relay/Timer
Part #950-1067
Check for 24V on the Red and
Yellow wires of WHK-2 trans-
former.
Replace WHK-2 25’
Control Cable.
Part #950-2060 Replace WHK-2
Transformer.
Part #950-2030
Check wiring inside Venter electrical box from WHK-2 metal conduit.
1) Gray from WHK-2 should be connected to thick Black Venter motor
wire and terminal 3 or 4 on Venter Relay.
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.
Jump the Red. Black and Blue wires on Water Heater Gas Pressure Switch. The
Venter should start.
SYMPTOM 3: HSUL, GPAK - SERIES POWER VENTER OR DRAFT INDUCER OPERATES WITH WATER HEATER NOT
WITH FURNACE OR BOILER. BEFORE CONTINUING, THE WHK-2 SHOULD HAVE POWER, THE WATER
HEATER SHOULD BE OFF AND THE FURNACE OR BOILER SHOULD BE CALLING FOR HEAT.
Check wiring inside Venter electrical box from WHK-2 metal conduit.
1) Gray from WHK-2 should be connected to thick Black Venter motor wire and
terminal 3 or 4 on Relay.
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. 24V should be present.
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 assis-
tance. With the Blue and Orange wires connected to terminals 7 & 8
of Venter Relay and the Furnace/Boiler calling for heat,
remove the Gray and thin Black wires from the Venter Relay
and check for continuity between the terminals which the
Gray and thin Black wires wire connected to. There should be
continuity.
Contact Tjernlund
Products, Inc. at 1-800-
255-4208 for assistance.
Replace Venter Relay.
Part #950-1040