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VS8521 VENTFREE MILLIVOLT GAS VALVE
CAUTION
Equipment Damage.
Can burn out heat anticipator in thermostat.
Never apply a jumper across or short the valve
coil terminals.
IMPORTANT
These gas valves are shipped with protective
seals over the inlet and outlet tappings. Do not
remove the seals until ready to connect the
piping.
Follow the appliance manufacturer instructions, if
available; otherwise, use these instructions.
IMPORTANT
The VS8521 ventfree valve is not convertible
between natural and LP gas.
WARNING
Fire or Explosion Hazard.
Can cause property damage, severe injury or
death.
Do not use a gas valve set for natural gas on an
LP gas system or a gas valve set for LP gas on a
natural gas system. Gas valves are factory-set for
natural (and manufactured) or LP gas.
VS8521 ventfree valves are not convertible.
Location
Locate the combination gas valve where it cannot be
affected by steam cleaning, high humidity, dripping water,
corrosive chemicals, dust or grease accumulation or
excessive heat. To assure proper operation, follow these
guidelines:
• Locate gas valve in a well-ventilated area.
• Mount gas valve high enough to avoid exposure to
flooding or splashing water.
• Assure the ambient temperature does not exceed the
ambient temperature ratings for each component.
• Cover gas valve if appliance is cleaned with water,
steam, or chemicals or to avoid dust and grease
accumulation.
• Avoid locating gas valve where it can be exposed to
corrosive chemical fumes or dripping water.
Install Piping to Gas Valve
All piping must comply with local codes and ordinances
or with the National Fuel Gas code (ANSI Z223.1
NFPA No. 54), whichever applies. Tubing installation
must comply with approved standards and practices.
1. Use new, properly reamed pipe free from chips.
When tubing is used, assure the ends are square,
deburred and clean. All tubing bends must be
smooth and without deformation.
2. Run pipe or tubing to the valve. If tubing is used,
obtain a tube-to-pipe coupling to connect the
tubing to the valve.
3. Install sediment trap in the supply line to the gas
valve. See Fig. 1.
69-1223—1
Install Valve
1. Mount valve 0 to 90 degrees, in any direction—
including vertically—from the upright position of the
gas control knob.
2. Mount the valve so gas flow is in the direction of
the arrow on the side of the valve.
3. Thread pipe 9/16 in. into the valve. Do not insert
deeper than 3/8 in. Valve distortion or malfunction
can result if the pipe is inserted too deeply.
4. Apply a moderate amount of good quality pipe
compound (do not use Teflon tape) to pipe only,
leaving two end threads bare. On LP installations,
use compound resistant to LP gas. See Fig. 2.
5. Remove seals over valve inlet and outlet, if
necessary.
6. Connect pipe to valve inlet and outlet. Use wrench
on either side of the pipe outlet. Refer to Fig. 3
through 5.
DROP
PIPED
HORIZONTAL
GAS
SUPPLY
GAS
CONTROL
3 INCHES
(76 MM)
MINIMUM
DROP
HORIZONTAL
TUBING
GAS
1
SUPPLY
RISER
3 INCHES
(76 MM)
MINIMUM
CAUTION
GAS LEAKAGE HAZARD.
FAILURE TO FOLLOW PRECAUTIONS CAN
RESULT IN A GAS-FILLED WORK AREA.
SHUT OFF THE MAIN GAS SUPPLY BEFORE REMOVING END CAP.
TEST FOR GAS LEAKAGE WHEN INSTALLATION IS COMPLETE.
1
ALL BENDS IN METALLIC TUBING SHOULD BE SMOOTH.
Fig. 1. Sediment trap installation.
TWO IMPERFECT
THREADS
GAS CONTROL
PIPE
THREAD PIPE ACCORDING TO
INSTALLATION PROCEDURE FOR
INSERTION INTO GAS CONTROL.
Fig. 2. Use moderate amount of pipe compound.
2
RISER
PIPED
GAS
SUPPLY
3 INCHES
(76 MM)
MINIMUM
GAS
CONTROL
APPLY A MODERATE AMOUNT OF
PIPE COMPOUND TO PIPE ONLY
(LEAVE TWO END THREADS BARE).
GAS
CONTROL
M4603A
M6913
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