AM Series Boiler & Water Heater User Manual
CHAPTER 4: INSTALLATION
– PIPING
OMM-0100_E
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GF-146
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11/15/2019
Technical Support
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(800) 526-0288
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Mon-Fri, 8 am - 5 pm EST Page 48 of 170
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Connect the cold water supply to the inlet side of the water heater.
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Connect the hot water supply to the outlet side of the water heater.
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Install a backflow preventer (field supplied) on the cold feed make-up water line
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Install a field supplied pump as shown in Figures 4-6 and 4-8.
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Install a field supplied expansion tank on the cold water inlet. Consult the tank
manu
facturer’s instruction for specific information relating to tank installation. Size the
expansion tank for the required system volume and capacity.
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Install a drain valve at the lowest point of the system.
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The temperature and pressure relief valve is sized to ASME specifications. Storage tanks
may require additional valves depending on local codes.
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Water heater isolation valves:
Field supplied. Install isolation valves as show on
Figures 4-6 and 4-8. Full port ball valves are required. Failure to use full port ball valves
could result in a restricted flow rate through the water heater.
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Anti-scald mixing valve:
Field supplied. Install an anti-scald mixing valve as shown on
Figures 4-6 and 4-8. An Anti-scald mixing valve is recommended when storing domestic
hot water above 115°F. An anti-scald mixing valve MUST always be installed on an AMR
system.
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Unions:
Field supplied. Install Unions as shown on Figures 4-5 and 4-7, recommended
for unit serviceability.
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Tank sensor:
Factory supplied on water heater. The tank sensor MUST be installed in the
lower 1/3 of the storage tank to achieve proper operation.
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Pump:
Recirculation pump should be sized according to AERCO’s Primary Loop Design
Guide, C400.3.
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Filter:
Field supplied. Install a filter or equivalent multipurpose strainer at the cold water
inlet connection of the water heater to remove system particles from older hydronic
systems and protect newer systems.
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LWCO (Low Water Cut-Off):
Factory Supplied. See Section 4.9.
Install the heater so the gas ignition system components are protected from water (dripping,
spraying, etc.), during appliance operation for basic service of circulator replacement, valves,
and others.
4.8 Safety Relief Valve
AM units come equipped with a safety relief valve on each factory installed module. Boilers are
supplied with 50 PSI pressure relief valves. Water heaters are supplied with 125 PSI T&P relief
valves. If a higher or lower rated PRV is required it must be field supplied and installed.
If an AM Series H-Stamped unit is being used directly in a domestic water heating application
the relief valves must be replaced with appropriate temperature & pressure relief valves. These
valves are supplied with the unit when configured in buy.aerco.com.
Pipe the discharge of the safety relief valve(s) (Figure 4-1) to a suitable drain to prevent injury in
the event of pressure relief. Each relief valve must have its own discharge piping, be piped to
within 18” of the ground, and not be combined with any other piping all the way to the point of
discharge into a drain. Provide piping that is the same size as the safety relief valve outlet.
