John Wood Power Direct Vent (Non-ENERGY STAR qualified models) - Manual (Page 8)

1. Install a readily accessible manual shut-off valve in the
gas supply line as recommended by the local utility. The
owner/operator must be shown the location of this valve
and be given instructions on how to use it to shut off the
gas to the heater.
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 76mm (3 in.) long for the accumulation of dirt,
foreign material, and water droplets.
3. Install a ground joint union between the gas control
/thermostat and the manual shut-off valve. This is to
allow easy removal of the gas control/thermostat.
4. Turn the gas supply on and check for leaks. Use a chlo-
ride-free soap and water solution (bubbles forming indi-
cate a leak) or other approved method.
Gas Pressure
Important: The gas supply pressure must not exceed the
maximum supply pressure as stated on the water heater’s
data plate.
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 pres-
sure exceeding 14 in. w.c. (3.5 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 in. w.c. (3.5 kPa), the water heater must be isolated
from the gas supply piping system by closing its manu-
al shut-off valve.
U.L. recognized fuel gas and (CO) detectors are recom-
mended in all applications and should be installed using the
manufacturer’s instructions and local codes, rules, or regu-
lations.
Note: Air may be present in the gas lines and could prevent
the burner from lighting on initial start-up. The gas lines
should be purged of air by a qualified service technician
after installation of the gas piping system.
Venting
This water heater has a direct vent system in which all air
for combustion is taken from the outside atmosphere and all
combustion products are discharged to the outdoors.
This water heater must be properly vented for removal of
exhaust gases to the outside atmosphere. Correct installa-
tion of the vent pipe system is mandatory for the safe and
efficient operation of this water heater and is an important
factor in the life of the unit.
A Vent Kit included with this water heater consists of:
1. Two (2) 45° Vent Termination Elbows,
2. Two (2) more restrictive Vent Termination Screens,
3. Two (2) less restrictive Vent Termination Screens,
4. Air intake adapter (3 in. to 2 in. ABS reducer),
5. Blower outlet adapter (rubber coupling and gear
clamps).
Vent pipe must be installed in accordance with all local and
provincial or state codes or, in the absence of such, the lat-
est edition of “Natural Gas and Propane Installation
Code” CAN/CSA-B149.1 (Canada), or “National Fuel Gas
Code” ANSI Z223.1 (NFPA 54) (U.S.A.).
Important: Check to make sure the vent pipe is not blocked
in any way.
Note: Do not common vent this water heater with any other
appliance. Do not install in the same chase or chimney with
a metal or high-temperature plastic from another gas or fuel
burning appliance.
Vent Pipe Material
The following plastic materials may be used for both the
combustion air intake and exhaust vent system subject to
local and provincial or state codes:
•
This heater is certified to be installed using Schedule 40
PVC or CPVC plastic vent material for the exhaust. In
Canada some jurisdictions require that the exhaust vent
material is approved to ULC S636. ULC S636 man-
dates that components from different systems must not
be mixed in the same vent runs. The combustion air
intake material may be PVC, ABS or CPVC. Check local
codes to determine which materials are allowed in your
area and only use approved material. All venting mate-
rial and components must be joined with the approved
primer/cleaner and solvent cement. Do not cement the
venting system to the heater.
Note: Use only solid (not foam core) piping. Plastic pipe and
fittings are available through most plumbing suppliers.
Always check the marking on the pipe to make sure you are
using the correct material.
– 8 –
WARNING
Exposure to a higher gas supply pressure
may cause damage to the control, resulting
in explosion or fire. Consult your local gas
supplier and gas authorities. DO NOT PUT
INTO SERVICE IF OVER-PRESSURIZATION
HAS OCCURRED.
DANGER
Carbon Monoxide Warning
• Follow all vent system requirements by
the local authorities having jurisdiction
over your installation.
• Failure to do so can result in death, explo-
sion or carbon monoxide poisoning.