AERCO AM Series Boiler User Manual - Manual (Page 43)

AM Series Boilers and Water Heaters
CHAPTER 3 – INSTALLATION
OMM-0100_0B AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 43 of 156
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3.12 Hot and Cold Water Piping – Water Heaters
This section applies only to water heaters. See Section 3.11 for piping of boilers.
• All water system piping must be installed in accordance with the ANSI/ASME Boiler and
Pressure Vessel Code, Section IV. All applicable local codes and ordinances must also be
followed.
• Before connecting the boiler to the heating system the heating system must be thoroughly
flushed to remove sediment, flux, filings and other foreign matter. The heat exchanger can
be damaged by build-up or corrosion due to sediment.
• This water heater can supply water at a temperature up to 203°F (95°C) (setup of the safety
high limit thermostat) and pressure of 160 PSI (setup of the relief valve). If the hot water
system is built with materials not able to resist to this temperature and pressure, you must to
install a device that shut-off the boiler before the material’s limit temperature and pressure.
• Do not use the heater to directly heat swimming pool or spa water.
3.12.1 Near-Boiler Heating Piping Components – Water Heaters
The separate storage vessel must have a temperature and pressure relief valve installed. This
relief valve shall comply with the Standard for Relief Valves for Hot Water Supply Systems,
ANSI Z21.22 • CSA 4.4.
Water heater system piping MUST be sized considering the pressure drops of the water heater
(see figure 3-14), piping and storage tank.
Reducing the pipe size can restrict the flow rate through the water heater, causing poor system
performance. Basic steps are listed below along with illustrations on Figures 3-16 and 3-17,
which will guide you through the installation of the water heater piping.
1. Connect the cold water supply to the inlet side of the water heater.
2. Connect the hot water supply to the outlet side of the water heater.
3. Install a backflow preventer (field supplied) on the cold feed make-up water line
4. Install a field supplied pump as shown in Figures 3-16 and 3-17.
5. Install a field supplied expansion tank on the cold water inlet. Consult the tank
manufacturer’s instruction for specific information relating to tank installation. Size the
expansion tank for the required system volume and capacity.
6. Install a drain valve at the lowest point of the system.
7. The temperature and pressure relief valve is sized to ASME specifications. Storage tanks
may require additional valves depending on local codes.
8. Water heater isolation valves: Field supplied. Install isolation valves as show on
Figures 3-16 and 3-17. Full port ball valves are required. Failure to use full port ball
valves could result in a restricted flow rate through the water heater.
9. Anti-scald mixing valve: Field supplied. Install an anti-scald mixing valve as shown on
Figures 3-16 and 3-17. An Anti-scald mixing valve is recommended when storing
domestic hot water above 115°F.
10. Unions: Field supplied. Install Unions as shown on Figures 3-16 and 3-17,
recommended for unit serviceability.
11. Tank sensor: Factory supplied on water heater. The tank sensor MUST be installed in
the lower 25% of the storage tank to achieve proper operation.