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WARNING
Fire or Explosion Hazard.
Can cause severe injury, death or property
damage.
Follow these warnings exactly:
1. To avoid dangerous accumulation of fuel gas,
turn off gas supply at the appliance service valve
before starting installation and perform the Gas
Leak Test after completion of installation.
2. Always install a sediment trap in gas supply line
to prevent contamination of ignition system
control.
3. Follow the appliance manufacturer instructions
if available; otherwise, use these instructions as
a guide.
WARNING
Scalding Hazard.
Can cause burns, severe injury or death.
Always use a direct replacement sensor assembly
when replacing a temperature sensor.
Location
The WV8840A is mounted on the outside of the water
heater tank. See Fig. 2.
WV8840
Fig. 2. Mounting the WV8840A on the water heater
Install Control to Water Tank
1. To install the water heater control, screw the assem-
bly into spud until the bracket is square. Use a max-
imum torque of 31 ft.-lbs. plus one turn.
2. Follow steps in the Connect Gas Supply section.
IMPORTANT
These water heater system controls are shipped
with protection for the inlet and outlet tappings.
Do not remove the protection until you are ready
to connect the piping.
Connect Gas Supply
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.
MOUNTING
WELL ASSEMBLY
ACCESS TO TANK
tank.
1. Use a 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. Ensure that gas supply is turned off.
3. Run pipe or tubing to the water heater control. If
tubing is used, obtain a tube-to-pipe coupling to
connect the tubing to the control.
4. Install a sediment trap in the supply line to the water
heater control. See Fig. 3.
HORIZONTAL
3 IN.
(76 MM)
MINIMUM
HORIZONTAL
1
RISER
3 IN.
(76 MM)
MINIMUM
WARNING
EXPLOSION 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. 3. Install a sediment trap in the supply line.
M29521
WARNING
Explosion Hazard.
Can cause severe injury, death or property
damage.
Check for gas leaks with soap and water solution
any time work is done on a gas system.
5. Apply a moderate amount of good quality pipe com-
pound, leave two end threads bare. Do not use pipe
dope on the outlet. See Fig. 4
6. Remove the seals over the water heater control inlet
and outlet, if necessary.
7. Connect the pipe to the water heater control inlet
and outlet. Use a wrench on the square end of the
water heater control. Maximum torque on the inlet is
40 ft-lbs.; maximum torque on the outlet is 30 ft-lbs.
8. Position compression fitting in pilot outlet and
engage threads. See Fig. 5 for controls and connec-
tions. Turn until finger tight, then tighten one more
turn with a wrench. Do not overtighten.
3
WV8840A WATER HEATER CONTROLS
PIPED
DROP
GAS
SUPPLY
DROP
TUBING
GAS
SUPPLY
M29522
69-2247—05
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