Honeywell VS8420C Installation Instructions Manual page 2

VS8420C,M MILLIVOLT GAS VALVE
WARNING
Fire or Explosion Hazard.
Can cause property damage, severe injury or
death.
Follow these instructions exactly:
1. Turn off gas supply at the appliance service
valve before starting installation, and perform
a Gas Leak Test after the installation is com-
plete.
2. Always install the sediment trap in the gas
supply line to prevent contamination of the
gas valve.
3. Do not force the gas valve control knob. Use
only your hand to turn the control knob. If the
knob does not operate by hand, the valve
should be replaced by a qualified service
technician.
WARNING
Electrical Shock or Equipment Damage Haz-
ard.
Can cause equipment damage, serious
injury or death.
Disconnect all power supplies before installa-
tion.
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 avail-
able; otherwise, use these instructions.
Converting 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. When making a conver-
sion, change the main pilot burner orifices to
meet the appliance manufacturer specifications.
69-1304
VS8420M gas controls with Convertible High/Low regu-
lators can be converted from one gas to the other with a
conversion kit (ordered separately). Order part number
396087-1 to convert from LP to natural gas. order part
number 396087-2 to convert from natural gas to LP.
High/low regulator model VS8420C cannot be
converted.
Location
Locate the combination gas valve where it cannot be
affected by steam cleaning, high humidity, dripping
water, corrosive chemicals, dust or grease accumula-
tion 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
Tubing installation must comply with approved stan-
dards 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 tub-
ing to the valve.
3. Install sediment trap in the supply line to the gas
valve. See Fig. 1.
Install Valve (Using Pipe)
1. Mount valve 0 to 90 degrees, in any directionÑin-
cluding verticallyÑfrom 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 15 mm. Do not insert deeper than10
mm. 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 nece-
sary.
6. Connect pipe to valve inlet and outlet. Use
wrench on either side of the pipe outlet. Refer to
Fig. 3 through 5.
2