General Information - Hydronic Piping - UTICA BOILERS MAHF-165 Installation, Operation And Maintenance Manual

!
WARNING
Burn and scald hazard! Manufacturer requires
installation of field supplied anti-scald valve.
Failure to follow these instructions could result in
death or serious injury.
General Information:
Piping installation, materials, and joining methods shall
conform to requirements of authority having jurisdiction or
in absence of such requirements:
• USA - National Fuel Gas Code, ANSI Z223.1/NFPA 54
• Canada - Natural Gas and Propane Installation Code,
CAN/CSA B149.1
Manufacturer Requirements/Recommendations:
• Manufacturer requires all domestic hot water (DHW)
installations use an anti-scald valve. Local codes
may require additional equipment (expansion tank,
relief valves, etc.) Select and size equipment to suit
installation and meet code requirements.
• Use of a water filter on incoming water supply line.
• Manufacturer recommends use of a magnetic dirt
separator in the hydronic system where there are
cast iron or steel components, or where the previous
boiler was a cast iron heat exchanger. The abrasive,
extremely fine sediment is difficult to remove and can
deposit onto heat exchanger surfaces and accumulate
in pump cavities causing reduced efficiency and
premature wear.
• The ASME temperature and pressure relief valve and
temperature and pressure gauge shall be installed
to conform to requirements of the authority having
jurisdiction. Refer to appropriate manufacturer
instructions for installation requirements.
• If piping manifold is not used, a primary/secondary
piping arrangement is manufacturer required.
Maximum of 12" separation between supply and
return pipe (closely spaced tees) of the boiler shall be
maintained.
• Limit combined supply and return pipe lengths to
maximum linear lengths of 20 ft (6.1 m) between
boiler and closely spaced tees, when minimum
¾" NPT pipe size is used. Linear length may be
increased if supply and return pipe size is increased
to limit pressure drop.
• Manufacturer recommends installing a shutoff
and purge valve to use during commissioning to
ensure the boiler does not shut down due to over
temperature. Do not install shutoff between boiler
and LWCO.

GENERAL INFORMATION - HYDRONIC PIPING

FOR YOUR SAFETY READ BEFORE OPERATING
DANGER
!
Hot Water Can Scald!
Water heated to temperature for clothes
washing, dish washing and other sanitizing
needs can scald and cause permanent injury.
Children, elderly, and infirm or physically
handicapped persons are more likely to be
permanently injured by hot water. Never leave
them unattended in bathtub or shower. Never
allow small children to use a hot water tap or
draw their own bath.
If anyone using hot water in the building fits the
above description, or if state laws or local codes
require certain water temperatures at hot water
taps, you must take special precautions:
• Use lowest possible temperature setting.
• Install some type of tempering device, such
as an automatic mixing valve, at hot water
tap or water heater. Automatic mixing valve
must be selected and installed according
to manufacturer's recommendations and
instructions.
• Water passing out of drain valves may be
extremely hot. To avoid injury:
• Make sure all connections are tight.
• Direct water flow away from any person.
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PN 240012875 REV. A [01/31/2020]