Tjernlund WHKE Millivolt Interlock Kit (Compatible with UC1 Control) 8504108 Rev 08/02 - Manual

WHKE MILLIVOLT INTERLOCK KIT FOR USE WITH UC1 UNIVERSAL
CONTROL, MAC1E OR MAC4E AUXILIARY CONTROLS
(For interlocking only with UC1 Universal Control, MAC1E or MAC4E auxiliary controls)
This Safety Interlock System may only be used on Category 1, millivolt heating appliances
equipped with a draft hood or draft diverter.
PURPOSE
To provide a means for Venter actuation and appliance shut-down in the event of flue blockage,
down drafts or Venter failure.
OPERATION
The Gas Pressure Switch senses gas pressure when the gas valve opens, completing the circuit
between A & B of the UC1, MAC1E or MAC4E control which activates the Venter. The Linear
Limit Spillage Sensor circuit is “normally closed” and will not affect normal appliance operation.
When concentrated spillage of combustion gases occurs from the draft hood or diverter, the
Linear Limit Spillage Sensor circuit will open preventing burner operation by disrupting the heater’s
millivolt safety circuit.
REPLACEMENT PARTS LIST
ITEM DESCRIPTION
950-2064 Linear Limit Spillage Sensor with manual reset, 185 o set point and 6 foot cable
950-2080 Gas Pressure Switch
950-0470 Thermocouple Junction adapter
LINEAR LIMIT INSTALLATION
1. Shut off fuel supply to the appliance.
2. Attach Linear Limit spillage sensor to draft hood (A1) or diverter (A2), see respective diagram.
3. 30 Millivolt water heaters require the 950-0470, Thermocouple Junction Adapter. Unscrew
thermocouple from gas valve and screw in Thermocouple Junction Adapter. Screw thermo-
couple into Thermocouple Junction Adapter. Connect Linear Limit cables to spade connec-
tions on Thermocouple Junction Adapter, (see Diagram B). On 750 Millivolt (power pile)
heaters, wire Linear Limit spill switch in series with high limit (ECO) of heater.
4. Using cable routing tabs from wire routing packet, attach Linear Limit control cable to appli-
ance maintaining a safe distance from hot surfaces, e.g. appliance vent pipe and hot water
pipes.
JUNCTION ADAPTER
THERMOCOUPLE
950-0470 (JA1)
LINEAR LIMIT
SPILL SWITCH
GAS
VALVE
ROUTING
CLIP
SWITCH
LINEAR LIMIT
DRAFT
DIVERTER
IMPORTANT:
DO NOT CUT THE COPPER CAPILLARY SENSING TUBE OR LIMIT WILL BE
DESTROYED AND APPLIANCE WILL BE DISABLED.
IMPORTANT:
Copper capillary sensing tube should not come in direct contact with metal surfaces.
Linear Limit spillage sensor should be mounted so that capillary will sample temper-
ature of gases spilling from vent or chimney, not temperature of metal surface.
DIAGRAM A1
DIAGRAM B
DIAGRAM A2
TJERNLUND PRODUCTS, INC.
1601 Ninth Street • White Bear Lake, MN 55110-6794
PHONE (800) 255-4208 • (651) 426-2993 • FAX (651) 426-9547
Visit our web site • www.tjernlund.com