Field Controls LS-140A installation instructions Wiring the LS-550A Limit switch

Wiring the LS-550A Limit switch

Wire the High temperature vent limit switch in accordance with the National Electrical Code, manufacturer's recommendations and/or applicable local codes. THE UNIT MUST BE GROUNDED WHEN WIRED TO ANY 120 VOLT CONTROLS. Check ground circuit to make certain that the unit has been properly grounded. The wiring should be protected by an over current circuit device rated at 15 amperes. Caution must be taken to ensure that the wiring does not come into contact with any heat source. All line voltage and safety control circuits, between the vent damper and the appliance, MUST be wired in accordance with the National Electrical Code for Class I wiring or equivalent methods.

BEFORE STARTING WIRING, TURN OFF ALL ELECTRICAL POWER TO THE APPLIANCE AT THE APPLIANCE SERVICE SWITCH OR CIRCUIT BREAKER!!

30MILLIVOLT WATER HEATER:

The application requires a TCA-1 Thermal Couple Junction block and a 6 foot length of 12 ga. two (2) wire conductor

CAUTION: Shut off gas supply before working on appliance.

1.Remove thermocouple from gas control valve. (See Figure 11)

2.Thread the TCA-1 junction block into the thermocouple port and thread the thermocouple into the bottom of the TCA-1 junction block.

3.Connect the 12 ga wire to the two quick connect terminals on the TCA-1(See Figure 12). Then route the 12 ga wire to the

LS-550 limit switch. Secure the wires to the water heater
enclosure with acceptable hold down tabs, keeping the wires	Figure 11
away from any hot surface area.

4.Connect one 12 ga wire lead to the common terminal connection on the limit switch and connect the other 12 ga wire lead to the normally closed (NC) terminal connection on the limit switch (See Figure 13).

Figure 12 Figure 13

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