9 60-2080—8
V48A,F,J; V88A,J
OPERATION • CHECKOUT AND TROUBLESHOOTING
Fig. 10—Operation of V48 and V88 diaphragm
gas valves.
In the event of a power failure during automatic opera-
tion, all V88 and V48 valves will close. Normal operation
will be resumed upon power restoration.
OPERATION OF THE VALVE POSITION
INDICATOR (FIG. 11)
An optional valve position indicator is available in the
1-1/4 in. V48A2227 and 2 in. V48F1103 Valves. When the
valve is open, a yellow disk shows in the window. When the
valve is closed, only the black top of the disk is visible.
Fig. 11—Valve position indicator (optional).
Checkout and Troubleshooting
WARNING
Do not allow fuel to accumulate in the combus-
tion chamber. If fuel is allowed to enter the cham-
ber for longer than a few seconds without igniting,
an explosive mixture could result.
CAUTION
1. Do not put the system into service until you
have satisfactorily completed all applicable
tests described in the Checkout section of the
instructions for the flame safeguard control,
and any other tests required by the burner
manufacturer.
2. Close all manual fuel shutoff valves as soon as
trouble occurs.
GAS
SUPPLY
PASSAGE
BLEED
PORT
PLUNGER
SPRING
WEIGHT
DIAPHRAGM
MAIN
GAS
SUPPLY
TO BURNER
VALVE CLOSED
GAS
SUPPLY
PASSAGE
BLEED
PORT
PLUNGER
SPRING
WEIGHT
DIAPHRAGM
MAIN
GAS
SUPPLY
TO BURNER
VALVE OPENING
GAS
SUPPLY
PASSAGE
BLEED
PORT
PLUNGER
SPRING
WEIGHT
DIAPHRAGM
MAIN
GAS
SUPPLY
TO BURNER
VALVE OPEN
M8489
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