Monitor GF 500 Service Manual download pdf (Page 4)

MONITOR HEATING SYSTEM

Section

1:

Description

1-4

MANUAL

GAS

VALVE

The

Manual

Gas

Valve

is

included with Heater.

Connect

the

Manual

Gas

Valve

to gas

inlet

at

rear

of

the

cabinet.

Connection

must

be

checked

for

gas-tightness

by

means

of

leak

detector solution, soap

and

water,

or an

equivalent nonflammable solution,

as

applicable.

Figure

1 -1

1-5

AUTOMATIC

GAS

VALVE

The

Automatic

Gas

Valve

is a

normally closed

two-stage,

electro/mechanical device which

either

allows

gas to

flow

to the

burner

or

prevents

it

from

doing

so.

When

the

valve

is

energized,

a

spring-loaded

plunger

is

lifted

to

permit

the

flow

of

gas.

Removing power from

the

valve

drops

the

plunger down into

the

inlet

to

prevent

gas

from

passing through.

Coil

Spring

Body

Valve

1-6 GAS

CONTROL

VALVE

The Gas

Control

Valve

provides constant

gas

pressure

(volume)

of two

modes (High, Low)

to

the

burner.

Operation

of the Gas

Control

Valve

is

controlled

by

the

Microprocessor.

The

specifications

of the Gas

Control

Valve

are

as

follows:

Type

of gas

Natural

LP

Inlet

Gas

Supply

7.0

11.0

Pressure

(in

W.C.)

Manifold 3.15 1.34 3.19 1.42

Pressure

(in

W.C.)

Burn Mode High

Low

High

Low

Adjusting

Screw

Diaphragm

Body

Figure

1 -2

Manifold pressure

can be

cheked

by

removing

brass

fitting from

end of Gas

Control

Valve

and

inserting

a

guage with

1/8 NPT

fitting.

Figure

1 -3

1 2 3 4 5 6 7 8 9 ... 20 21

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