Operation - Honeywell V48F Product Data

V48A,F,J; V88A,J DIAPHRAGM GAS VALVES
BLEED TAPPING
126590 ADJUSTABLE BLEED VALVE
COMPRESSION NUT
7/16-24 UNS
1/4 INCH
SLEEVE
TUBING
ADJUSTING SCREW
Fig. 8. Installing optional 126590 adjustable bleed valve.
BLEED PORT
1/8-27 NPT
BLEED ORIFICE
(SELECTED)
1/8 INCH DIAMETER ROD
Fig. 9. Installing optional bleed orifice.
60-2080—9
1/8-27 NPT
7/16 INCH HEX
M7290

OPERATION

Operation of the V48 and V88 Valves
(Fig. 10)
When the controller is not calling for heat, the coil is
de-energized. The plunger in the 3-way actuator is in the
DOWN position so the bleed port is closed and the supply port
is open. Gas flows into the top part of the valve. The gas
pressure on top of the diaphragm, the weight, and the spring
hold the valve closed.
SPRING
WEIGHT
DIAPHRAGM
MAIN
GAS
SUPPLY
SPRING
WEIGHT
DIAPHRAGM
MAIN
GAS
SUPPLY
SPRING
WEIGHT
DIAPHRAGM
MAIN
GAS
SUPPLY
Fig. 10. Operation of V48 and V88 diaphragm gas valves.
On a call for heat, the controller contacts close and the coil is
energized. This pulls the plunger to the UP position, opening
the bleed port and closing the supply port. The gas in the top
8
PLUNGER
GAS
SUPPLY
PASSAGE
BLEED
PORT
TO BURNER
VALVE CLOSED
PLUNGER
GAS
SUPPLY
PASSAGE
BLEED
PORT
TO BURNER
VALVE OPENING
PLUNGER
GAS
SUPPLY
PASSAGE
BLEED
PORT
TO BURNER
VALVE OPEN
M8489