John Wood Direct Vent - Manuel (Page 16)

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SPACE HEATING AND POTABLE WATER SYSTEMS
This appliance has been design certifi ed as complying
with American National Standard/CSA Standard for water
heaters and are considered suitable for Water (Potable)
Heating and Space Heating. Note: This water heater
may be used in combination potable water/space heating
system. Do not use in a space heating only application.
Toxic Chemical Hazard
WARNING
• Do not connect to non-potable water system.
Note: Ensure the water heater has been properly sized
to accommodate the needs of the hot water demand and
space heating load. Undersizing the water heater can
result in insuffi cient hot water, excessive condensation
and ineffi cient operation.
• This water heater should not be connected to any
heating systems or components previously used with
a non-potable water heating appliance.
• All piping components connected to this unit for space
heating applications should be suitable for use with
potable water.
• Pumps, valves, piping and fi ttings must be compatible
with potable water.
• Toxic chemicals, such as those used for boiler treatment
shall not be introduced into the potable water used for
space heating.
• When the system requires water for space heating at
temperatures higher than required for domestic water
purposes, a mixing valve must be installed. Please refer
to Figure 8 for suggested piping arrangement.
• Be sure to follow the manual(s) shipped with the air
handler or other type heating system.
• This water heater is not to be used as a replacement
for an existing boiler installation.
• Do not use with piping that has been treated with
chromates, boiler seal or other chemicals and do not
add any chemicals to the water heater piping.
• A properly installed fl ow control valve is required to
prevent thermosiphoning. Thermosiphoning is the
result of a continuous fl ow of water through the air
handler circuit during the off cycle. Weeping (blow off)
of the temperature-pressure relief valve (T&P) or higher
than normal water temperatures are the fi rst signs of
thermosiphoning.
• The hot water line from the water heater should be
vertical past any mixing valve or supply line to the
heating system to remove air bubbles from the system.