Install Instructions

VS820 AND VS821 MILLIVOLTAGE COMBINATION GAS CONTROLS
95-6994EF—03 2
4. After completing installation, use these
instructions to check product operation.
WARNING
FIRE OR EXPLOSION HAZARD
CAN CAUSE PROPERTY DAMAGE, SEVERE
INJURY, OR DEATH
Follow these warnings exactly:
1. Disconnect power supply before wiring to
prevent electrical shock or equipment damage.
2. To avoid dangerous accumulation of fuel gas,
turn off gas supply at appliance service valve
before starting installation and perform Gas
Leak Test following installation.
3. Do not bend pilot tubing at control or at pilot
after compression fitting has been tightened.
Gas leakage at the connection fitting may
result.
4. Always install sediment trap in gas supply line
to prevent contamination of gas control.
5. Do not force gas control knob. Use only your
hand to turn gas control knob. If the knob will
not operate by hand, the control should be
replaced by a qualified service technician.
Force or attempted repair may result in fire or
explosion.
CAUTION
Never apply a jumper across (or short) valve coil
terminals. This may burn out thermostat heat
anticipator.
IMPORTANT
These gas controls are shipped with protective
seals over inlet and outlet tappings. Do not
remove seals until ready to connect piping.
Follow the appliance manufacturer’s instructions if
available; otherwise, use the instructions provided below
as a guide.
Choose Location
Do not locate the combination gas control where it may
be affected by steam cleaning, high humidity or dripping
water, corrosive chemicals, dust or grease accumulation,
or excessive heat. To ensure proper operation, follow
these guidelines:
• Locate in a well ventilated area.
• Mount high enough above the cabinet bottom to avoid
exposure to flooding or splashing water.
• Ensure that the ambient temperature does not exceed
the ambient temperature ratings for each component.
• Cover if appliance is cleaned with water, steam, or
chemicals or to avoid dust and grease accumulation.
• Avoid locating where exposure to corrosive chemical
fumes or dripping water is likely.
Mount the combination gas control in the appliance
vestibule on the gas manifold. If this is a replacement
application, mount the gas control in the same location
as the old control. Make sure the total control circuit wire
length does not exceed 30 ft [9.2 m] of
2-wire, 18 gauge cable or 50 ft [15.3 m] of 2-wire, 16
gauge cable.
Inlet and Outlet Adapters
If adapters are needed, prepare control as follows:
1. Remove seal over control inlet or outlet.
2. Apply moderate amount of good quality pipe com-
pound to adapter, leaving two end threads bare.
Refer to Fig. 1. On LP installation, use compound
resistant to LP gas. Do NOT use Teflon tape.
3. Insert adapter in control and thread carefully until
tight.
Fig. 1. Use moderate amount of pipe compound.
Install Piping to Control
All piping must comply with local codes and ordinances
or with 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. If
tubing is used, make sure the ends are square,
deburred and clean. All tubing bends must be
smooth and without deformation.
2. Run pipe or tubing to control. If tubing is used,
obtain a tube-to-pipe coupling to connect tubing to
the control.
3. Install sediment trap in the supply line to the gas
control. Refer to Fig. 2.
Fig. 2. Sediment trap installation.
TWO IMPERFECT
THREADS
GAS CONTROL
THREAD PIPE THE AMOUNT
SHOWN IN TABLE FOR
INSERTION INTO GAS CONTROL
APPLY A MODERATE AMOUNT OF
PIPE COMPOUND TO PIPE ONLY
(LEAVE TWO END THREADS BARE).
M3075D
PIPE
GAS
CONTROL
GAS
CONTROL
HORIZONTAL
DROP
PIPED
GAS
SUPPLY
PIPED
GAS
SUPPLY
3 IN.
(76 MM)
MINIMUM
3 IN.
(76 MM)
MINIMUM
RISER
GAS
CONTROL
TUBING
GAS
SUPPLY
HORIZONTAL
DROP
3 IN.
(76 MM)
MINIMUM
RISER
M3077C
2
1
2
2
1
2
ALL BENDS IN METALLIC TUBING SHOULD BE SMOOTH.
CAUTION: SHUT OFF THE MAIN GAS SUPPLY BEFORE REMOVING
END CAP TO PREVENT GAS FROM FILLING THE WORK AREA. TEST
FOR GAS LEAKAGE WHEN INSTALLATION IS COMPLETE.