ELECTRICAL WIRING (MILLI-VOLT)

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

CAUTION

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

Wall Switch

On/Off

Switch

ODS Pilot

On/Off

Switch

ODS

Pilot

 

Millivolt

 

Valve

3

Spade Terminal

1

 

2

 

 

 

 

Optional Wall

CONNECTION

Switch, Wall Thermostat,

1

=

TP

Thermostat Sensor or

Remote

2

=

TP, TH

 

3

=

TH

 

Switch

Figure 7 - Wiring Diagram

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.

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.

 

 

CONNECT

 

 

CHECK

TO

METER

THERMOSTAT

METER

TEST

TEST

LEADS TO

CONTACTS

READING

 

 

TERMINALS

 

SHOULD BE

 

 

 

 

 

A

COMPLETE

2 & 3

CLOSED

MINIMUM

 

 

SYSTEM

 

175mv

 

 

 

 

 

B

THERMOPILE

1 & 2

OPEN

500mv

 

OUTPUT

 

 

OR MORE

 

 

 

 

 

A.COMPLETE MILLIVOLT SYSTEM CHECK

("A" Reading - Thermostat 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 - Thermostat 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. 500 millivolts minimum. If the minimum millivolt reading is not obtainable, replace pilot.

46D0550

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Monessen Hearth DSSPVMB, DSSNVMB Electrical Wiring MILLI-VOLT, Connecting Optional Wall Switch or Thermostat

DSSPVMB, DSSNVMB specifications

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