Monessen Hearth NB18 Electrical Wiring Millivolt, Connecting Optional Wall Switch Or Thermostat

ELECTRICAL WIRING (MILLIVOLT)

The Millivolt valve is a self-powered combination gas control THAT DOES NOT REQUIRE 110 VAC TO OPER-

ATE.

Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation. Verify proper operation after servicing.

ODS

Pilot

		ODS
On/Off		Pilot
Switch or		Millivolt
Optional		Valve
Wall
Switch,
Remote or
T-Stat	TH = 3
	TP = 1
	TP/TH = 2

Log Switch

Figure 17 - Wiring Diagram

Note: Log switch wires are not factory connected.

Connect log switch wires to the TH/TP and TH valve terminals as shown.

CONNECTING OPTIONAL WALL SWITCH OR THERMOSTAT

1.Use 18 awg, two-wire cable, 15 feet maximum length.

2.At one end of the cable, connect both wires to the wall switch or thermostat. At the other end, connect one wire to TP/TH and one wire to TH, or connect the wall switch/thermostat to the two male (0.25") terminals on the left side of the unit. The color of the wires does not matter.

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