John Wood SpaceSaver (2.5 Gallon) - Manual (Page 7)

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5. Install a shut off valve in the cold water inlet line. It
should be located close to the water heater and be
easily accessible. The owner/operator must be shown
the location of this valve and be given instructions on
how to use it to shut off the water to the heater.
6. Install a temperature and pressure relief valve and
discharge line in the opening marked “T & P RELIEF
VALVE”. Install as specified under “Temperature and
Pressure Relief Valve.”
7. After piping has been properly connected to the water
heater, follow the instructions in the “Filling the Water
Heater” section of this manual.
Temperature and Pressure
Relief Valve
For protection against excessive pressures and
temperatures, a temperature and pressure relief valve must
be installed in the opening marked “T & P RELIEF VALVE”
(see Figure 5).
CAUTION: To reduce the risk of excessive pressures and
temperatures in this water heater, install temperature and
pressure relief protective equipment required by local
codes, but no less than a combination temperature and
pressure relief valve certifi ed by a nationally recognized
testing laboratory that maintains periodic inspection of the
production of listed equipment or materials, as meeting
the requirements for “Relief Valves and Automatic Gas
Shut-Off Devices for Hot Water Supply Systems”, ANSI
Z21.22 - latest edition. This valve must be marked with the
maximum set pressure not to exceed the marked maximum
working pressure of the water heater. Install the valve into
an opening provided and marked for this purpose in the
water heater, and orient it or provide tubing so that any
discharge from the valve exits only within 300mm (12 in.)
(Can.), 6 in. (150mm) (U.S.A.), above, or at any distance
below, the structural fl oor, and does not contact any live
electrical part. The discharge opening must not be blocked
or reduced in size under any circumstance.
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 & Pressure Relief Valve:
•
Shall not be in contact with any electrical part.
• Shall be connected to an adequate discharge line.
• Shall not be rated higher than the working pressure
shown on the rating plate of the water heater.
The Discharge Line:
•
Shall not be smaller than the pipe size of the relief
valve or have any reducing coupling installed in the
discharge line.
• Shall not be capped, blocked, plugged or contain
any valve between the relief valve and the end of the
discharge line.
• Shall terminate a maximum of 300mm (12 in.) (Can.), 6
in. (150mm) (U.S.A.), above a floor drain or external to
the building.
• Shall be of material listed for hot water distribution.
• Shall be installed to allow complete drainage of both
the valve and discharge line.
Closed System/Thermal Expansion
Periodic discharge of the temperature and pressure relief
valve may be due to thermal expansion in a closed water
supply system. The water utility supply meter may contain a
check valve, backflow preventer or water pressure reducing
valve. This will create a closed water system. During
the heating cycle of the water heater, the water expands
causing pressure inside the water heater to increase. This
may cause the temperature and pressure relief valve to
discharge small quantities of hot water. To prevent this, it
is recommended that a diaphragm-type expansion tank
(suitable for potable water) be installed on the cold water
supply line. The expansion tank must have a minimum
capacity of 5.6 litres (1.5 U.S. gallons) for every 190 litres
(50 U.S. gallons) of stored water. Contact the local water
supplier or plumbing inspector for information on other
methods to control this situation.
IMPORTANT: Do not plug or remove the temperature and
pressure relief valve.
Filling the Water Heater
Do not insert the power cord into the electrical receptacle
until all the following steps have been completed.
1. Open all hot water faucets served by the system to al-
low air to escape from the tank.
2. Open the cold water inlet valve.
NOTE: When filling, avoid water leakage. Do not allow
the insulation of the water heater to get wet as water can
reduce the effectiveness of the insulation.
Failure to follow these instructions can
result in death or explosion.
Do not remove valve.
Do not plug valve.
Examples of a qualified person include:
licensed plumbers, authorized gas company
personnel, and authorized service
personnel.
If the temperature and pressure relief valve
is dripping or leaking, have a qualified
person replace it.
Explosion Hazard
WARNING