V4295A,S; V8295A,S SOLENOID GAS VALVES
65-0194—04
6
Fig. 6. Wiring, V4295A,S.
Fig. 7. Wiring, V8295A,S.
OPERATION
The V4295A and V8295A Normally Closed series gas valves
are Class B fail safe shut off valves. The valve is opened by
energizing the direct ON/OFF operator. The direct ON/OFF
operator consists of a coil and stop sleeve assembly. Inside
the stop sleeve assembly is a plunger which is able to move
up and down, thus opening or closing the valve. The plunger
glides on two anti-friction bearings. A strainer, made of AISI
303 stainless steel, is incorporated into the valve.
CHECKOUT AND TROUBLESHOOTING
WARNING
Do not allow fuel to accumulate in the combustion
chamber. If fuel is allowed to enter the chamber 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 test required by the burner
manufacturer.
2. Close
all
manual fuel shut off valves as soon as
trouble occurs.
CHECKOUT
1.
Check the performance of the valve by measuring the
pressures at the inlet and outlet pressure taps. The
pressure reading at the outlet tap may be slightly higher
than a downstream measurement due to dynamic gas
flow effects. The measurement at the outlet tap is for
reference only.
2.
Shut off gas supply to valve and make sure valve is
closed when setting up pressure measuring equipment.
3.
Set thermostat or controller to energize the valve and
check final outlet pressure.
4.
Start the system and observe its operation through at
least one complete cycle to ensure the valve functions
as described in the section “Operation” on page 6.
Valve Leak Test (Fig. 8)
This is a test for checking the closure tightness of the gas
safety shutoff valve. It should be performed only by trained,
experienced flame safeguard control technicians during the
initial startup of the burner system or whenever the valve is
replaced (see Service Information section). It is recommended
that this test also be included in the scheduled inspection and
maintenance procedures.
1.
De-energize the control system to make sure no power
goes to the valve (
C
2.
Close the upstream manual gas cock (
A
).
3.
Make sure the manual test petcock (
F
) is closed in the
leak test tap assembly (
D
).
4.
Remove the leak test tap plug and connect the test
apparatus to the leak test tap (
D
).
5.
Close the downstream manual gas cock (
E
).
6.
Open the upstream manual gas cock (
A
).
7.
Run the V4/8295A Valve to is open position (through the
safety system); then immediately de-energize the sys-
tem to close the V4/8295A Valve.
8.
Immerse a 1/4 in. (6 mm) tube vertically 1/2 in. (13 mm)
into a jar of water.
9.
Slowly open the manual test petcock (
F
).
M28664
120 VAC
GROUND
G
4
N
L
9
NEUTRAL
LINE
VOLTAGE
MAIN VALVE
V4295A,S
RM7800
(TYPICAL)
L2
M28665
LIMIT(S)
TRANSFORMER
L1
(HOT)
L2
V8295A,S
G
N
L
24 VOLT
THERMOSTAT
FLAME
SAFEGUARD
CONTROL
POWER SUPPLY. PROVIDE DISCONNECT
MEANS AND OVERLOAD PROTECTION
AS REQUIRED.