American International PR 150-34 2NV or 2PV Water Heater User Manual


 
17
If the space heating system requires water temperatures
in excess of 120°F, a tempering valve (provided) must
be installed per the manufacturer’s instructions in the
potable hot water supply to limit the risk of scald injury.
Pumps, valves, piping and ttings must be compatible
with potable water.
A properly installed ow control valve is required to pre-
vent thermosiphoning. Thermosiphoning is the result
of a continuous ow of water through the air handler
circuit during the off cycle. Weeping (blow off) of the
temperature and pressure relief valve (T & P) or higher
than normal water temperatures are the rst signs of
thermosiphoning.
The hot water line from the water heater should be
vertical past any tempering valve or supply line to
the heating system to remove air bubbles from the
system.
Do not connect the water heater to any system or
components previously used with non-potable water
heating appliances when used to supply potable water.
Storage Tank Installation
When installing the Polaris® with a storage tank, see figure
18 for piping suggestions.
Solar Installation
If this water heater is used as a solar storage heater or as
a backup for the solar system, the water supply tempera-
tures to the water heater tank may be in excess of 120°F.
A tempering valve must be installed in the water supply
line to limit the supply temperature to 120°F.
Note: Solar water heating systems can often supply water
with temperatures exceeding 180°F and may result in
water heater malfunction.
Figure 17: Air Handler Piping Installation
Massachusetts code does not
allow this type of installation.
*100 Gallon Model Shown.