ELECTRICAL WIRING (MILLI-VOLT)

OPERATION OF THERMOSTAT SENSOR

1.Follow millivolt lighting instructions on lighting plate attached to unit or in homeowner’s manual.

2.With control knob in the “ON” position make sure the ON/OFF switch is in the “OFF” position. See Figure 24.

3.The unit is now being controlled by the thermostat sensor. The sensor will now cycle the burners on and off. You can adjust how often the unit cycles by turning the control knob on the sensor.

ON/OFF

Switch

Control

Knob

THE

SERMOS

TTINGTAT

HIGH

2

 

6D33

 

17

LOW

 

T-Stat

Sensor

Figure 24 - Control Knob in “ON” Position and ON/OFF Switch in “OFF” Position

CHECKING SYSTEM OPERATION

The milli-volt system and individual com- ponents may be checked with a milli-volt meter having a 0-1000 mV range. Conduct each check shown in chart below by con- nection meter test leads to terminals as indicated.

 

 

CONNECT

 

 

 

CHECK

TO

METER

THERMOSTAT

METER

 

TEST

TEST

LEADS TO

CONTACTS

READING

 

 

 

TERMINALS

 

SHOULD BE

 

A

COMPLETE

TP/TH and TH

CLOSED

MINIMUM

 

 

SYSTEM

 

 

175

 

 

 

 

 

 

 

B

THERMOPILE

TP and TP/TH

OPEN

MINIMUM

 

 

OUTPUT

 

 

500

 

 

 

 

 

 

 

A.COMPLETE MILLI-VOLT SYSTEM CHECK

(“A” Reading - Thermostat contacts CLOSED - Control Knob “ON” - Main burner should turn ON)

a.If the reading is more than 175 milli-volts and the automatic valve still does not come on, replace the control.

b.If the closed circuit reading (“A” reading) is less than 175 milli-volts, determine cause for low reading, proceed to Section B below.

B.Thermopile Output Reading Check

(“B” Reading - Thermostat contacts OPEN - Main burner OFF)

1. Check gas pressure to the unit. If gas pressure is within minimum and maximum on data plate, then check pilot voltage, 500 milli-volts minimum. If the minimum milli-volt reading is not obtainable, replace pilot.

44D0060

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Monessen Hearth DEB30, DEB20 Operation of Thermostat Sensor, Checking System Operation, Complete MILLI-VOLT System Check

DEB20, DEB30 specifications

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