Tjernlund WHK-2 Millivolt Interlock Kit (Discontinued - Not Compatible with UC1) 8504026 Rev 8 09/98 - Manual (Page 5)

5. Measure and cut an appropriate length of tubing to reach from the fitting marked “warning” to the burner of the heater on Gas
Pressure Switch. Connect to Gas Pressure Switch and route to burner area.
NOTE: The Gas Pressure Switch has a built in pressure tap marked “gauge port” for future gas pressure testing, (See Diagram D).
LINEAR LIMIT SPILLAGE SENSING SWITCH
PURPOSE:
To provide a means for appliance shut-down in the event of flue
blockage or Power Venter/Draft Inducer failure.
OPERATION:
When concentrated spillage of the products of combustion occurs
from the draft hood, the Linear Limit sensing switch circuit will open
preventing burner operation.
1. Attach the Linear Limit sensing switch mounting bracket to the top
of the water heater using the sheet metal screws provided. The
Linear Limit bracket should be approximately 1/2” from the draft
hood, (See Diagram E).
2. Attach the three Linear Limit capillary mounting brackets around
the draft hood, equally spaced.
3. Insert the Linear Limit spillage sensing switch capillary into the “U”
of the Linear Limit brackets outlining the perimeter of the draft
hood. The Linear Limit capillary may be overlapped if necessary,
(See Diagram F). IMPORTANT: DO NOT CUT THE CAPILLARY, it
will be destroyed and water heater will be disabled.
4. Route the Linear Limit spillage switch cable down the water heater casing locating the end near the Solenoid Valve. Secure it with
the cable clamps and self drilling screws provided.
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DIAGRAM E
TOP VIEW
DIAGRAM F
DIAGRAM D DIAGRAM C