American International PG10*34-130-2NV or 2PV Manual Do Utilizador

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 fi ttings must be compatible  

with potable water.

•  A properly installed fl ow control valve is required to pre-

vent 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 and 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 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.

When installing the Polaris® with a storage tank, see figure 
18 for piping suggestions.

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.

Massachusetts code does not 
allow this type of installation.