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VS8420 MILLIVOLT GAS VALVE
WARNING
Electrical Shock or Equipment Damage
Hazard.
Can cause severe injury or death, or short
equipment circuitry.
Disconnect all power supplies before installation.
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.
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 conversion,
change the main pilot burner orifices to meet the
appliance manufacturer specifications.
VS8420A gas controls with standard regulators can be
converted from one gas to the other with a conversion kit
(ordered separately). Order part no. 395991 to convert
from natural (manufactured) to LP gas. Order part no.
395992 to convert from LP to natural (manufactured)
gas.
VS8420E gas controls with Convertible High/Low
regulators can be converted from one gas to the other
with a conversion kit (ordered separately). Order part no.
396087-1 to convert from LP to natural (manufactured)
gas. Order part no. 396087-2 to convert from natural
(manufactured) to LP gas.
High/low regulator model VS8420D cannot be converted.
VS8420R Convertible Pressure Regulators
Gas valves with suffix letter R are convertible pressure
regulator models. They can be converted from natural
gas to LP or from LP to natural gas without a converter
kit.
Before converting the gas valve from one gas to another,
check the gas valve label and the appliance
manufacturer rating plate to make sure the pressure
regulator setting (factory set) meets the appliance
manifold requirements after conversion.
NOTE: Convertible pressure regulator models (suffix R)
do not have field-adjustable regulators. the
natural gas and LP settings are factory-set.
69-1165—3
CONVERTING THE GAS VALVE
If the factory pressure regulator setting meets the
appliance manifold requirement, convert the gas valve as
follows (see Fig. 1):
1. Remove the black thread protective cap.
2. Remove the conversion flip cap by turning it coun-
terclockwise
3. Invert the conversion flip cap so that the letters and
associated arrow for the gas type appropriate for
the appliance application are face down toward the
valve. NAT is for natural gas and LP is for liquefied
petroleum
4. Tighten the conversion flip cap by turning it clock-
wise
.
NAT
Fig. 1. Converting the gas valve.
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.
2
.
PROTECTIVE
CAP
CONVERSION
NAT
FLIP CAP
PRESSURE
REGULATOR
HOUSING
M16521
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