John Wood Power Direct Vent (Non-ENERGY STAR qualified models) - Manual (Page 14)

5.6 litres (1.5 US gallons) for every 190 litres (50 US gal-
lons) of stored water and be rated at the working pressure
of the water heater. Contact the local water supplier or
plumbing inspector for information on other methods to con-
trol this situation.
Important: Do not plug or remove the temperature and
pressure relief valve.
Temperature and Pressure (T&P) Relief
Valve
For protection against excessive pressures and tempera-
tures, a temperature and pressure relief valve must be
installed in the opening marked “T&P RELIEF VALVE” (see
Figure 12). This valve must be design certified by a nation-
ally recognized testing laboratory that maintains periodic
inspection of the production of listed equipment or materials
as meeting the requirements of the “Standard For Relief
Valves For Hot Water Supply Systems”, ANSI
Z21.22/CSA 4.4. The function of the temperature and pres-
sure relief valve is to discharge water in large quantities in
the event of excessive temperature or pressure developing
in the water heater. The valve’s relief pressure must not
exceed the working pressure of the water heater as stated
on the data plate.
Important: Only a new temperature and pressure relief
valve should be used with your water heater. Do not use an
old or existing valve as it may be damaged or not adequate
for the working pressure of the new water heater. Do not
place any valve between the relief valve and the tank.
The Temperature and Pressure Relief Valve:
• Must not be in contact with any electrical part.
• Must be connected to an adequate discharge line.
• Must not be rated higher than the working pressure
shown on the data plate of the water heater.
The Discharge Line:
• Must not be smaller than the pipe size of the relief valve
or have any reducing coupling installed in the discharge
line.
• Must not be capped, blocked, plugged or contain any
valve between the relief valve and the end of the dis-
charge line.
• Must terminate a maximum of 300mm (12 in.) (Canada)
or 150mm (6 in.) (U.S.A.) above the floor.
• Must be capable of withstanding 121°C (250°F) without
distortion.
• Must be installed to allow complete drainage of both the
valve and discharge line.
Electrical Supply
Important: The electrical controls used inside the gas con-
trol/thermostat mounted on this water heater are polarity
sensitive. Ensure the electrical supply is connected cor-
rectly in the receptacle box. Failure to connect correctly will
prevent the unit from functioning properly (see Figures 13
and 15). Before performing any electrical service work, label
all wires to avoid connection errors. If wiring has to be
replaced, use only TYPE TEW 105C wire, except igniter
wires. If there is a problem with igniter wires, replace igniter
assembly in its entirety. In locations where a sump pump
failure, flooding or exposure to water may be present, a
ground fault receptacle is recommended.
Important: Do not use an extension cord to connect the
water heater to an electrical outlet.
•
Ensure that the water heater and the outlet are proper-
ly grounded.
• Ensure that the water heater is installed in accordance
with prevailing provisions of local codes, or, in the
absence of such, the latest edition of “Canadian
Electrical Code (CAN/CSA C22.1), Part I” (Canada)
or “National Electrical Code” (NFPA 70) (U.S.A.).
Figure 12 Temperature & Pressure Relief Valve
Installation
TEMPERATURE AND
PRESSURE RELIEF
VALVE
DISCHARGE LINE 19mm (3/4 in.)
MIN. DO NOT CAP OR PLUG.
DRAIN PAN. CONNECT TO
PROPERLY OPERATING
FLOOR DRAIN.
WARNING
Explosion Hazard
• If the temperature and pressure relief
valve is dripping or leaking, have a
licensed plumber repair it.
• Do not plug valve.
• Do not remove valve.
• Failure to follow these instructions can
result in death or an explosion.
– 14 –
WARNING
Electrical Shock Hazard
• Disconnect power before
servicing.
• Replace all parts and panels
before operating.
• Failure to do so can result in
death or electrical shock.