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AM Series Boilers and Water Heaters
CHAPTER 4: INSTALLATION - PIPING
OMM-0100_0D
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
Page
37
of
154
GF-146
Ph.: 800-526-0288
03/28/16
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Anti-scald mixing valve:
Field supplied. If the boiler is connected to an indirect
water heater for domestic hot water, this device MUST be installed.
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Unions:
Field supplied. Recommended for unit serviceability.
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Safety relief valve
. See Section 4.8.
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LWCO (Low Water Cut-Off):
A LWCO comes with every unit and must be field installed.
For more information, see Section 4.9.
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Indirect water heaters:
Field supplied. This boiler may be piped to an indirect water heater
to heat domestic hot water with the space heat transfer medium. The indirect water heater is
connected to the system supply piping. A pump controlled by the boiler’s control will provide
the
flow of water through the indirect water heater. The indirect water heater’s temperature
will be regulated by the boiler’s control. The boiler is pre-
configured to control the operation
of the DHW pump with Domestic Hot Water Prioritization programming.
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Temperature Sensor:
For a single unit installation, the temperature sensor must be
relocated to the system piping. For multiple unit installations using the AM Cascade
Sequencer, the cascade header temperature sensor (included) must be installed in the
system piping.
CAUTION!
It is up to the installer to ensure that the minimum
system flow is met, otherwise the flow
sensors will automatically stop the burner.
WARNING!
The National Standard Plumbing Code, the National Plumbing Code of Canada and the
Uniform Plumbing Code limit the pressure of the heat transfer fluid to less than the minimum
working pressure of the potable water system up to 30 psi maximum. Also, the heat transfer
fluid must be water or other non-toxic fluid having a toxicity of Class 1, as listed in Clinical
Toxicology of Commercial Products, 5th Edition.
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Filter:
Field supplied. A filter or equivalent multipurpose strainer is recommended at the
return pipe of the boiler to remove system particles from older hydronic systems and protect
newer systems.
4.7 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 4-4), 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 4-6 and 4-8,
which will guide you through the installation of the water heater piping.
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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.