John Wood Atmospheric Gas (Standard) - Manual (Page 9)

9
MANUAL GAS
SHUT-OFF VALVE
GROUND JOINT
UNION
DRIP LEG
3 in. (7.62 cm) MINIMUM
CHECK WITH LOCAL UTILITY
FOR MINIMUM HEIGHT
12 in. (300mm)
MAXIMUM AIR GAP
FIGURE 3.
Gas Pressure
WARNING
Explosion Hazard
• Gas leaks can not always be detected by smell.
• Gas suppliers recommend that you use a gas
detector approved by UL or CSA.
• For more information, contact your gas supplier.
• If a gas leak is detected, follow the “What to do if you
smell gas” instructions on the cover of this manual.
IMPORTANT: The gas supply pressure must not exceed the
maximum supply pressure as stated on the water heater’s rating
plate. The minimum supply pressure is for the purpose of input
adjustment.
Gas Pressure Testing
IMPORTANT: This water heater and its gas connection must
be leak tested before placing the appliance in operation.
•
If the code requires the gas lines to be tested at a
pressure exceeding 14” W.C. (3.486 kPa), the water heater
and its manual shut-off valve must be disconnected from
the gas supply piping system and the line capped.
• If the gas lines are to be tested at a pressure less than 14”
W.C. (3.486 kPa), the water heater must be isolated from
the gas supply piping system by closing its manual shut-
off valve.
NOTE: Air may be present in the gas lines and could prevent
the pilot from lighting on initial start-up. The gas lines should
be purged of air by a qualified technician after installation of
the gas piping system. While purging the gas piping system
of air, insure that the fuel is not spilled in the area of the
water heater installation, or any source of ignition. If the
fuel is spilled while purging the piping system of air follow
the “WHAT TO DO IF YOU SMELL GAS” instructions on
the cover of this manual.
GAS SUPPLY
WARNING
• Use a new CSA approved gas supply line.
• Install a shut-off valve.
• Do not connect a natural gas water heater to an L.P. gas
supply.
• Do not connect an L.P. gas water heater to a natural gas
supply.
• Failure to follow these instructions can result in death,
explosion, or carbon monoxide poisoning.
Explosion Hazard
Gas Requirements
IMPORTANT: Read the rating plate to be sure the water
heater is made for the type of gas you will be using in
your home. This information will be found on the rating
plate located near the gas control valve/thermostat. If the
information does not agree with the type of gas available,
do not install or light. Call your dealer.
NOTE: An odorant is added by the gas supplier to the gas
used by this water heater. This odorant may fade over an
extended period of time. Do not depend upon this odorant
as an indication of leaking gas.
Gas Piping
The gas piping must be installed according to CAN/
CSA B149.1-current edition (Natural Gas and Propane
Installation Code) and all local/provincial codes. Consult
the Natural Gas and Propane Installation Code (CAN/CSA
B149.1) for information on the correct sizing of gas pipe and
other materials.
NOTE: Use pipe joint compound or teflon tape marked as
being resistant to the action of petroleum [Propane (L.P.)]
gases (See Figure 3.)
1. Install a readily accessible manual shut-off valve in the
gas supply line as recommended by the local utility.
Know the location of this valve and how to turn off the
gas to this unit.
2. Install a drip leg (if not already incorporated as part of
the water heater) as shown. The drip leg must be no
less than three inches long for the accumulation of dirt,
foreign material, and water droplets.
3. Install a ground joint union between the gas control
valve/thermostat and the manual shut-off valve. This
is to allow easy removal of the gas control valve/
thermostat.
4. Turn the gas supply on and check for leaks. Test all
connections by brushing on an approved noncorrosive
leak-detection solution. Bubbles will show a leak.
Correct any leak found.