AMR Integrated Water Heaters (Supplement to GF-146)
CHAPTER 5: INSTALLATION – PIPING
CHAPTER 4:
INSTALLATION - PIPING
4.1 AMR Integrated Water Connections
The AMR Integrated units come with water connections as shown in Figures 3-5 and 4-1.
Water heater system piping MUST be sized considering the pressure drops of the water heater
(see figure 4-2), 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 4-5 and 4-7,
which will guide you through the installation of the water heater piping.
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Connect the cold water supply to the Cold Water Inlet of the water heater (Figure 4-1).
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Connect the hot water supply to the Hot Water Outlet of the water heater (Figure 4-1).
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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 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.
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Install a drain valve at the lowest point of the system.
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Water heater isolation valves:
Field supplied. Install isolation valves as shown in Figures
4-5 and 4-7. Full port ball valves are required. Failure to use full port ball valves could
result in a restricted flow rate through the water heater.
•
Anti-scald mixing valve:
Field supplied. Install an anti-scald mixing valve as shown on
Figures 4-5 and 4-7. 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:
The recirculation pump used in the loop on the rear of the unit should be sized and
installed according to Section 4.3.
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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.
•
LWCO (Low Water Cut-Off):
Factory Supplied.
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.
4.2 Safety Relief Valve
AMR Integrated units come equipped with a 125 PSI T&P safety relief valves on each factory
installed module. If a higher or lower rated PRV is required it must be field supplied and
installed.
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.
OMM-0106_0A
AERCO International, Inc.
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100 Oritani Dr.
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Blauvelt, NY 10913
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GF-146-IR
Ph.: 800-526-0288
PRI - 07/22/15