TJERNLUND WHKE MILLIVOLT INTERLOCK KIT (COMPATIBLE WITH UC1 CONTROL) 8504108 REV 0802, WHKE Installation 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, 185oset 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 thermo­couple into Thermocouple Junction Adapter. Connect Linear Limit cables to spade connec­tions 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 appli­ance 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 temper­ature 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 [phone] • [phone] • FAX [phone]
Visit our web site • www.tjernlund.com

GAS PRESSURE SWITCH INSTALLATION

The gas pressure switch is mounted on the casing of the water heater adjacent to the heater's thermostat/gas control valve. It should be
mounted close enough so that the supplied 1/4" tubing will reach from the gas pressure switch fitting to the thermostat/gas valve pres­sure tap port. The two provided screws are self-tapping and drilling. The screws do not require the use of a drill and 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 of the two mounting holes.

IMPORTANT: Mount gas pressure switch so that diaphragm is in a VERTICAL

position, (See Diagram C).

2. Install the supplied 1/8"-NPT pipe plug to the 90

o

port of the supplied 1/8-NPT black pipe tee, (See Diagram C).

Use thread sealant, do not over tighten.

3. Install the 1/8-NPT black pipe tee to the gas pressure switch, (See Diagram C). Use thread sealant, do not over
tighten. CAUTION: Utilize the hex nut on the gas pressure switch when attaching the black pipe tee.

4. Install the supplied Brass 1/8-NPT male x ¼" compression fitting to the 1/8-NPT black pipe tee, (See Diagram C).
Use thread sealant, do not over tighten.

5. Remove the PRESSURE TAP plug from the underside of the thermostat/gas control valve and install the supplied Brass
1/8-NPT male x ¼" compression fitting, (See Diagram C). Use thread sealant, do not over tighten.

IMPORTANT: DO NOT alter the heater's PILOT GAS LINE, (See Diagram C).

6. Using a tube cutter, cut the appropriate length of the supplied 1/4" tubing to reach from the gas pressure switch fitting to the
PRESSURE TAP PORT fitting of the thermostat/gas control valve. Make sure each end of the tubing is not pinched closed.

7. Use the 1/4" tubing to connect gas pressure switch fitting to the PRESSURE TAP PORT fitting on the thermostat/gas control valve.

8. Conduct a gas leakage test of all connections as outlined in the latest edition of NFPA 54, ANSI Z223.1, part 4. or local codes.

NOTE: A "gauge port" can be accessed by removing the 1/8-NPT pipe plug that is on the 1/8-NPT black pipe tee (attached to

the gas pressure switch).

DO NOT ALTER

GAS SUPPLY

INTO PRESSURE TAP PORT.

GAS PRESSURE SWITCH

GAS CONTROL VALVE

THERMOSTAT/

PILOT GAS LINE

FIGURE 700S107 2/13/04

INSTALL BRASS 1/8-NPT MALE
x 1/4" COMPRESSION FITTING

THERMOCOUPLE

BURNER GAS LINE

COMMON

MUST BE MOUNTED VERTICALLY.

GAS PRESSURE SWITCH DIAPHRAGM

IMPORTANT:

BRASS 1/8-NPT MALE x 1/4"
COMPRESSION FITTING

THERMOSTAT / GAS CONTROL

TO PRESSURE TAP FITTING OF

1/4" OUTSIDE DIAMETER

ALUMINUM TUBING - CONNECT

VALVE.

1/8-NPT BLACK PIPE TEE

1/8-NPT PIPE PLUG - NEW
PRESSURE TAP PORT

NORMALLY OPEN

MOUNTING HOLES

IMPORTANT:

DIAGRAM C