Tjernlund WHK-2 Millivolt Interlock Kit (Discontinued - Not Compatible with UC1) 8504026 Rev 8 09/98 - Manual (Page 4)

2. This device must be installed by a qualified professional installer in accordance with all local codes or in their absence in
accordance with the National Electrical Code and the Occupational Safety and Health Act (OSHA) when applicable.
3. “Qualified Installer” shall mean an individual properly trained and licensed.
4. Disconnect power supply when making wiring connections or when working around the Venter motor. Failure to do so may
result in severe personal injury and equipment damage.
5. Make certain the power source is adequate for the motor requirements and all controls. Do not add a Mechanical Vent System to a
circuit where the total electrical load is unknown.
ACTUATION AND SAFETY CONTROLS INSTALLATION
After opening carton, inspect thoroughly for hidden damage. If any damage is
found notify freight carrier and your distributor immediately and file a concealed
damage claim.
1. Remove the carton labeled Actuation and Safety Controls.
2. Open this carton and remove the gas Solenoid Valve. Make sure that the
black coil guard is covering the coil of the Solenoid Valve as shown in
Diagram B.
3. Remove the 3/8” to 1/2” adapter fittings and install one adapter in each end
of the Solenoid Valve. Use a thread sealant to insure gas-tight seal. NOTE:
3/8” to 1/2” adapters are not used if using Pilot Saver kit (P/N 950-2061)
4. Install the Solenoid Valve in between the manual shut off valve and the water
heater thermostat/valve. NOTE: If installing Pilot Saver kit (P/N 950-2061),
the Solenoid Valve is installed in 1/2” burner line from water heater gas valve.
5. Verify that the arrow on the casing of the Solenoid Valve points in the direction of the water heater’s thermostat/valve. The Solenoid
Valve must be installed on the supply side of the drip tee. The Solenoid Valve should be positioned so the top of the coil cover is
on top of or horizontal to the Solenoid Valve. Do not position so that the top of the coil cover is pointing downward.
All gas piping shall be tested and inspected in accordance with NFPA 54, ANSI Z223.1, part 4. Any leakages shall be located by
means of an approved combustible gas detector, soap and water, or an equivalent nonflammable solution, as applicable. If leakage
or other defects are detected, the affected portion of the piping system shall be repaired or replaced and retested.
GAS PRESSURE SWITCH
Remove the gas pressure switch from the carton. Also remove the 1/8” compression
fitting, the four 1/2” x #10 self tapping screws and the 2 sections of 1/4” diameter alu-
minum tubing from the master carton liner. The gas pressure switch is mounted on
the casing of the water heater adjacent to the heater’s thermostat/valve. It should be
mounted close enough so that the supplied 1/4” tubing will reach from the gas pres-
sure switch fittings to the burner. The four provided screws are self tapping and
drilling. They do not require the use of a drill. Their 1/2” length assures that the inner
tank will not be penetrated.
1. Mount the gas pressure switch by securing it to the heater casing with a screw in each one of the four mounting holes.
2. Using a tube cutter, cut the appropriate length of 1/4” tubing to reach from the fitting marked “connect to gas valve” on Gas
Pressure Switch to the pressure tap port of the thermostat/valve, (See drawing “Gas Control Valve”). NOTE: DO NOT alter the
heater's pilot gas line.
3. Remove the pressure tap plug from the underside of the thermostat/valve and install the supplied compression fitting. Use thread
sealant, do not over tighten, (See drawing “Gas Control Valve”).
4. Connect the fitting installed in step #3 to the fitting marked “connect to gas valve” on the Gas Pressure Switch. Make sure each
end of the tubing is not pinched closed, (See Diagram C, Page 3).
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DIAGRAM B
GAS CONTROL VALVE
NOTE: Do not alter pilot gas line