Manual

11
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Water Supply Connections Continued....
In regards to the HOT WATER OUTLET:
• Connections between the water heater and point(s) of use should
be as short and direct as possible.
• DO NOT use lead or non-approved plastic pipe.
• To conserve energy and minimize heat loss, insulation of hot water
piping is recommended.
NOTICE: The ow rate of hot water may vary when more than two
faucets (appliances, xtures, etc.) are being used simultaneously.
NOTICE: The pipes MUST be completely drainable. If the hot water
faucets are located at a point higher than the water heater, place a
drain valve at the lowest point (see diagram to the left).
A new pressure relief valve, complying with the Standard for relief Valves and Automatic Gas Shut-
Off Devices for Hot Water Supply Systems, ANSI Z21.22, must be installed at the hot water outlet
connection of the water heater at the time of installation. Local codes shall govern the installation of
relief valves.
For safe operation of the water heater, be sure that:
• The pressure rating of the relief valve must not exceed 150 psi, the maximum working pressure of
the water heater as marked on the rating plate.
• The BTUH rating of the relief valve must equal or exceed the BTUH input of the water heater as
marked on its rating plate.
• No valve of any type should be installed between the relief valve and the water heater.
• Discharge from the relief valve should be piped to a suitable drain to eliminate potential water
damage. Piping used should be of a type approved for the distribution of hot water.
• Hot and cold water lines should be insulated up to the water heater.
• The discharge line must be NO SMALLER than the outlet of the valve and must pitch downward to
allow complete drainage (by gravity) of the relief valve and discharge line.
• The end of the discharge line should not be threaded or concealed and should be protected from
freezing. No valve of any type, restriction or reducer coupling should be installed in discharge line.
NOTICE: The diagram below illustrates a pressure only relief valve. If local codes require a combination
temperature and pressure relief valve be installed, an extension piece may be needed.
Relief Valve
NOTICE: Local codes govern the installation of relief valves.
If local codes require that a temperature and pressure relief
valve should be installed the manufacturer recommends a
type 40XL Watts T&P relief valve or an equivalent model be
used.
NOTICE: Manual operation of relief valves should be
performed at least once a year. Turn off the electrical power
and gas shutoff valve. Lift and release lever on the relief
valve and check the manual operation of the relief valve. You
should take precaution to avoid contact with the hot water
coming out of the relief valve and to prevent water damage.
NOTICE: If the relief valve on the system discharges
periodically, this may be due to thermal expansion in a closed
water supply system. Contact the water supplier or local
plumbing inspector on how to correct this situation. Do not
plug the relief valve.
Display screen
Front cover
Motor fan
Temperature
controller
Heat exchanger
Fixing board
Seal ring
Water flow sensor
Burner assemblu
Ignition pin
Proportion Valve
Flame sensor
Flame
sensor board
Solenoid valve
Gas inlet pipe
Back cover
Power cord
Gas flute
Water inlet pipe
Computer board
Wind switch
Clip
Hot water
temp. sensor
Fixing board
Back cover
Motor fan
Burner assembly
Wind Switch
Heat exchanger
Water flow sensor
Water inlet pipe
Hot temperature sensor
Gas inlet pipe
Gas flute
Temp controller
Computer board
Gas valve