John Wood Envirosense Power Vent - Manual (Page 14)

14
Gas pIpInG
Make sure the gas supplied is the same type listed on the model
rating plate. The inlet gas pressure must not exceed 14 inch water
column (3.5 kPa) for natural and propane gas (L.P.). The minimum
inlet gas pressure shown on the rating plate is that which will permit
firing at rated input.
All gas piping must comply with local codes and ordinances or with the
Natural Gas and Propane Installation Code (CAN/CSA B149.1).
Copper and brass tubing and fittings (except tin lined copper tubing)
should not be used.
If the gas control valve is subjected to pressures exceeding 1/2 psi
(3.5 kPa), the damage to the gas control valve could result in a fire
or explosion from leaking gas.
If the main gas line Shut-off serving all gas appliances is used, also
turn “off” the gas at each appliance. Leave all gas appliances shut
“off” until the water heater installation is complete.
A gas line of sufficient size must be run to the water heater.
Consult the current edition of Natural Gas and Propane Installation
Code (CAN/CSA B149.1) and your gas supplier concerning pipe size.
There must be:
• A readily accessible manual shut off valve in the gas supply line
serving the water heater, and
• A drip leg (sediment trap) ahead of the gas control valve to help prevent
dirt and foreign materials from entering the gas control valve.
• A flexible gas connector or a ground joint union between the shut
off valve and control valve to permit servicing of the unit.
Be sure to check all the gas piping for leaks before lighting the water
heater. Use a soapy water solution, not a match or open flame.
Rinse off soapy solution and wipe dry.
This heater is approved for operation up to 5,300 feet (1,615 m)
without alteration. High altitude models are available from the
factory for elevations between 5,300 feet (1,615 m) and 10,100
feet (3,079 m).
Use pipe joint compound or teflon tape marked as being resistant
to the action of petroleum [Propane (L.P.)] gases.
The appliance and its gas connection must be leak tested before
placing the appliance in operation.
The appliance and its individual Shut-off valve should
be disconnected from the gas supply piping system during
any pressure testing of that system at test pressures in
excess of 1/2 pound per square inch (3.5 kPa). It should be
isolated from the gas supply piping system by closing
its individual manual Shut-off valve during any pressure
t e s t i n g o f t h e g a s s u p p l y p i p i n g s y s t e m a t t e s t
pressures equal to or less than 1/2 pound per square
inch (3.5 kPa).
Connecting the gas piping to the gas control valve of the water
heater can be accomplished by either of the two methods shown
in Figures 12 and 13.
fIGure 12. Gas pIpInG wIth
FLEXIBLE CONNECTOR.
FIGURE 13. GAS PIPING WITH ALL
BlacK Iron pIpe to Gas control.