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GS-406_
(On/Off with
Gas/Air Ratio
Control)
12 G—UL Listed GS-20/25 and GS-40/45 Series Single-block Multi-function Gas Control Valves Technical Bulletin
Figure 10: Servo Pressure Regulator Performance vs.
Cycle the valve three times to check for proper performance, leaving a
minimum time of 20 seconds between cycles to evacuate the pressure
chamber.
This valve provides mechanical modulating control of the gas outlet
pressure at a consistent ratio to the main air blower pressure. An example
of a typical installation is shown in Figure 11. The burner control responds
to a higher demand for heat by increasing the amount of air being supplied
to the burner, resulting in an increased air pressure. With the air pressure
(P
) connected to the valve, the valve seat position is controlled to achieve
A
the optimum outlet gas pressure according to the preset gas/air ratio.
The combustion chamber pressure (P
combustion quality in cases where the combustion chamber pressure is
significantly higher during operation than atmospheric pressure.
G S S eries C o m bina tio n C on tro l
O ptio na l
P re ssu re
S w itch
M an ua l
S h utoff
Valve
G as
L ine
Filte r/
S traine r
A ir L ine
Figure 11: Typical Application Installation
P
G
P
ST
Tim e (s)
3 to 12 S eco nds
Timing Characteristics
) can be connected to improve
F
S o le no id
Valve W o rking
w ith C on tro lle r
P
P
G
F
Gas/Air
Co ntro ller
M
P
G
B o iler
P
A
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