American Water Heater Polaris High Efficiency Commercial Gas Water Heater PCG3 User Manual

11
INLET/OUTLET VENT TERMINATIONS
Standard Horizontal Termination
When 3 inch pipe is used between the water heater and the 
outside wall, reduce it to 2 inch pipe before penetrating the 
wall. A maximum of 18 inches (45.7 cm) of 2 inch pipe may 
be used between the 3 inch transition and the inside of the 
wall (see figure 7).
The standard horizontal air inlet termination is a 2 inch 
pipe which terminates at the exterior wall and utilizes a 
coupling to prevent the pipe from being pushed back into the...

12
VERTICAL TERMINATIONS
When 3 inch pipe is used between the water heater and the 
roof, reduce it to 2 inch pipe before penetrating the roof. 
A maximum of 18 inches (45.7 cm) of 2 inch pipe may be 
used between the 3 inch transition and the inside of the 
roof.
The vertical inlet air termination requires a return bend 
or two short or long sweep radius 90 elbows to keep the 
inlet downward and prevent entry of rain. These elbows 
are considered part of the termination and should not be 
included when...

13
CONCENTRIC VENT TERMINATIONS
For new installations, install 2” Concentric vent kit model 
KGAVT0501CVT, part number 6910542.  See Manufacturer’s 
instructions for complete installation or call customer service at 
1-800-456-9805 for assistance or go to www.americanwaterheater.com.   
For planning purposes, see figures 10-13 below for vent terminal 
specifications.
Note:  For replacement installations, previously installed 
American Water Heater Company supplied concentric vent kits 
are acceptable for...

14
Figure 14: Input GraphGas Input Rate
The gas input rate of this water heater is affected by 
several environmental factors such as:
• The heating value of the gas
• The air and gas densities (which vary widely due to baro-
metric pressure and temperature changes)
• Venting installations (pipe diameter, length and fittings)
• Altitude
When measuring the input rate these factors should be 
incorporated into the calculations. Also measure the gas 
consumption over a sufficiently long time to obtain an...

15
Figure 15: Typical One-Temperature System Piping Installation
Mixing Valve Installation
A mixing 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.
General Information
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...

16 •  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.
•  If the space heating system requires water temperatures 
in excess of 120°F (48.9°C), a mixing 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 fittings must be compatible  
with potable water.
•  A properly installed flow...

17
Temperature and Pressure 
Relief Valve
For protection against excessive pressures and tempera-
tures, a temperature and pressure relief valve must be 
installed in the opening marked “T & P RELIEF VALVE”.  
This valve must be design certified by a nationally recog-
nized testing laboratory that maintains periodic inspection 
of the production of listed equipment or materials as meet-
ing the requirements for Relief Valves and Automatic Shut-off Devices for Hot Water Supply Systems, ANSI Z21.22. 
The...

18
GAS SUPPLY AND PIPING
Gas Requirements
Read the data plate to be sure the water heater is made 
for the type of gas being used.  This information will be 
found on the data plate located on the front of the water 
heater. If the information does not agree with the type of 
gas available, do not install or operate the water heater. 
Call your dealer.
Note:  An odorant may be added by the gas supplier to 
the gas used by this water heater. This odorant may fade 
over an extended period of time. Do not...

19
Gas Pressure Testing
Important: This water heater and its gas connection must 
be leak tested before placing the appliance in operation.  
• If the code requires the gas lines to be tested at  a 
pressure of 14” W.C. (3.486 kPa) or greater, the water 
heater and its manual shut-off valve must be discon-
nected  from the gas supply piping system and the line  
capped.
• If the gas lines are to be tested at a pressure less   
than 14” W.C. (3.486 kPa), the water heater must be 
isolated from the gas...

20
Electrical Shock Hazard
Disconnect power before
servicing.
Replace all parts and panels
before operating.
Failure to do so can result in 
death or electrical shock.
ELECTRICAL CONNECTIONS
Figure 20: Electrical Connections
If you lack the necessary skills required to properly install 
the electrical wiring to this water heater, do not proceed but 
have a qualified electrician perform the installation.
When making the electrical connections, always make 
sure:
• The voltage and frequency correspond to...