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

16

A tempering valve has been provided for use with the 
Polaris®

  

Gas water heater and must be installed, per the 

manufacturer’s instructions, in the domestic hot water line.  
See Figure 16 for a sample tempering valve installation.

Water piping, fittings, and valves must be properly installed 
for the correct and safe operation of this water heater. 
Please note the following:
•   The system should be installed only with piping that is 

suitable for potable (drinking) water such as copper, 
CPVC, or polybutylene. PVC water piping may be used 
on the cold water  inlet supply but not within 18 inches 
of the cold water connection on the water heater.  

•  Do not use PVC piping on the hot water outlet,      

space heating supply, or space heating return.

•  Do not use any pumps, valves, or fi ttings that are      

not compatible with potable water.

•  Do not use valves that may cause excessive      

restriction to water fl ow. Use full fl ow ball or gate      
valves only.

•  Do not use 50/50 tin-lead solder (or any lead based   

solder) in potable water lines. Use 95/5 solder or      
other equivalent material.

•  Do not tamper with the thermostat, gas valve,     

blower, electrical components, or temperature and   
pressure relief valve. Tampering with any of the      
components is dangerous and can result in death,   
severe injury, or property damage. Tampering voids  
all warranties. Only qualifi ed technicians should     
service these components.

•  Do not use this water heater as a replacement for an 

existing boiler installation.

•  Do not use with piping that has been treated with      

chromates, boiler seal, or other chemicals.

•  Do not add any chemicals to the system piping      

which will contaminate the potable water supply.

When a backflow prevention device or check valve is 
installed, it can create a “Closed System.” Heating water 
in a closed system causes normal thermal expansion and 
increases pressure in the water system.  When this pres-
sure reaches 150 psi, it triggers the safety system in the T 
& P Relief Valve.  This can result in the relief valve releas-
ing water during every cycle.  The rapid and repeated 
expansion and contraction of the water heater components 
and the system piping can cause premature failure of the 
relief valve, as well as the water heater itself.  Replacing 
the relief valve will not correct the problem.  

If the water heater is installed in a closed water supply sys-
tem, such as one having a backflow preventer in the cold 
water supply line, means shall be provided to control ther-
mal expansion. Contact the water supplier or local plumb-
ing inspector on how to control this situation.

A properly sized expansion tank must be installed to pre-
vent the water pressure from building to such a level in a 
Closed System.  The manufacturer of this water heater 
will void the warranty if there is a failure to install a 
properly sized expansion tank. 

Some water heater models are equipped with inlet/outlet 
connections for use in space heating applications. If this 
water heater is to be used to supply both space heating 
and potable (drinking) water, the instructions listed below 
must be followed (see fi gure 17).

•  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 chro-

mates, boiler seal or other chemicals and do not add 
any chemicals to the water heater piping.