Monitor GF1800 - Automatic Gas Valve; Gas Control Valve; Manual Gas Valve

MONITOR HEATING SYSTEM
Section 1: Description
1-7 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
1-8 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
Figure 1-2
1-9 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
Inlet Gas Supply
Pressure(in W.C.)
Manifold
Pressure(in W.C.)
Burn Mode
Natural
7.0
LP
11.0
GF3800
3.4 1.26 3.15 1.26
GF1800
3.15
High
1.34
Low
3.19
High
1.42
Low
Adjusting
Screw
Diaphragm -^
Body
Figure 1-3
Manifold pressure can be cheked by removing
brass fitting from end of Gas Control Valve and
inserting a guage with 1/8 NPT fitting.