Tjernlund WHK-2 Millivolt Interlock Kit (Discontinued - Not Compatible with UC1) 8504026 Rev 8 09/98 - Manual (Page 3)

TABLE OF CONTENTS
Pilot Outage.....................................................................................................................................................................1
General Cautions & Installation Restrictions...............................................................................................................1, 2
Installation
Actuation & Safety Controls..............................................................................................................................2
Solenoid Valve ..................................................................................................................................................2
Gas Pressure Switch ....................................................................................................................................2, 3
Linear Limit Spill Switch....................................................................................................................................3
Electrical Wiring
115VAC interlock with HSUL, GPAK Power Venters or Draft Inducers with 950-1040 24/115 VAC Relay......4
115VAC interlock with HST, GPAK-T Power Venters or Draft Inducers with 950-1067 Relay/Timer ...............5
115VAC interlock with HS115 Series Power Venters or Draft Inducers............................................................6
System Schematic/WHK-2 Operation ...............................................................................................................6
WHK-2/HSUL or GPAK Series Furnace or Boiler & Water Heater Connection Diagram.................................7
WHK-2/HST or GPAK-T Series Furnace or Boiler & Water Heater Connection Diagram................................7
WHK-2/SideShot Furnace or Boiler & Water Heater Connection Diagram ......................................................8
24 VAC Water Heater Connections ..................................................................................................................8
Operation Circuit Check ..................................................................................................................................................9
Safety Interlock Test ........................................................................................................................................................9
Combustion Air Test ........................................................................................................................................................9
Post Purge Timer Adjustment .........................................................................................................................................9
Troubleshooting......................................................................................................................................................10, 11
Warranty Claim Procedure ............................................................................................................................................12
Typical Applications ......................................................................................................................................................13
IN THE EVENT OF PILOT OUTAGE
1. Push the reset button in the center of the Linear Limit spillage sensing switch located
on the draft hood on the top of the water heater, (See Diagram A)
2. Turn the gas pilot knob at the top of water heater gas valve to “OFF” position.
Gas pilot knob MUST REMAIN IN “OFF” POSITION FOR FIVE MINUTES BEFORE
PILOT IS RE-LIT. Perform steps 3 & 4 while waiting.
3. Visually verify that there is 115 volt power established to the Power Venter.
(Check fuse or circuit breaker, wall plug and electrical connections).
4. Visually verify that all connections of the control cord circuit are intact.
5. Follow water heater manufacturer’s re-lighting instructions attached to water heater or located in water heater owner’s manual.
USER NOTE:
Since the Power Venter/Draft Inducer cannot operate during a power outage, the safety interlock controls are designed to prohibit gas
flow to the water heater. Follow the above procedures and water heater manufacturer’s instructions for relighting the pilot when power
has been restored.
OPTIONAL PILOT SAVER KIT AVAILABLE
The optional Pilot Saver Kit (P/N: 950-2061) allows for Solenoid Valve to be installed in 1/2” burner gas line from water heater gas
valve which eliminates pilot outages caused by power interruptions.
INSTALLATION RESTRICTIONS
1. Failure to install, maintain and/or operate this device in accordance with manufacturer’s instructions may result in conditions which
can produce bodily injury and property damage.
1
IMPORTANT
NOTE: These instructions do NOT cover the installation of the Power Venter/Draft Inducer. Install the Power Venter/Draft
Inducer first, according to the manufacturer’s instructions before proceeding with the installation of the WHK-2. Do not con-
nect 115V wiring of Power Venter/Draft Inducer. The WHK-2 is designed to interlock a millivolt appliance of up to 120,000
BTU’s with a Power Venter/Draft Inducer. The WHK-2 can be wired two different ways.
A. To interlock a single millivolt appliance, such as a water heater.
B. To interlock a millivolt appliance and provide the primary power so that one Power Venter/Draft Inducer can vent both a
water heater and a furnace/boiler.
DIAGRAM A