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Electrical wiring (milli-volt) – Monessen Hearth Double Door VFCS30DPV User Manual

Page 16

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16

58D6002

Label all wires prior to

disconnection when

servicing controls.

Wiring errors can cause

improper and dangerous

operation. Verify proper

operation after servicing.

ELECTRICAL WIRING (MILLI-VOLT)

The milli-volt valve is a self-powered combination gas control THAT DOES NOT REQUIRE 110 VAC TO OPERATE.

On/Off
Switch

On/Off
Switch

ODS

Pilot

Wall

Switch

Optional Wall

Switch or

Remote

ODS Pilot

Millivolt

Valve

Spade Terminal

3
1
2

CONNECTION
1 = TP
2 = TP, TH
3 = TH

Figure 13 - Wiring Diagram

CONNECTING OPTIONAL WALL SWITCH
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. At the other end, connect one wire to TP/TH and one

wire to TH, or connect the wall switch to the two male (0.25") terminals on the left side of the unit. The color of the

wires does not matter.

A. COMPLETE MILLIVOLT SYSTEM CHECk

("A" Reading - On/Off switch contacts CLOSED - Control knob “ON” - Main Burners should turn ON)

a. If the reading is more than 175 millivolts and the automatic valve still does not come on - replace the valve.
b. If the closed circuit reading ("A" reading) is less than 175 millivolts, determine cause for low reading - proceed as

follows:

B. THERMOPILE OUTPUT READING CHECk

(“B” Reading - On/Off switch contacts OPEN - Main burner OFF)

Check gas pressure to the unit. If gas pressure is within minimum and maximum on data plate, then replace pilot. If the

minimum millivolt reading is not obtainable, replace pilot.

CHECkING SYSTEM OPERATION
The millivolt system and individual compo-

nents may be checked with a millivolt meter

having a 0-1000mv range. Conduct each

check shown in chart by connecting meter

test leads to terminals as indicated.

Switch

CHECk

TEST

TO TEST

CONNECT METER

LEADS TO TERMINALS

METER READING

SHOULD BE

A

COMPLETE

& 3 SYSTEM

MINIMUM 1mv

B

THERMOPILE

OUTPUT

1 & SYSTEM

00mv OR MORE

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