Hydronic Piping; General; Special Conditions - UTICA BOILERS MAHF-165 Installation, Operation And Maintenance Manual

WARNING
!
• Poison hazard. Ethylene glycol is toxic. Do not use
ethylene glycol.
• Never use automotive or standard glycol antifreeze,
even ethylene glycol made for hydronic systems.
• Ethylene glycol can attack gaskets and seals used in
hydronic systems.
• Do not use petroleum based cleaning or sealing
compounds boiler system.
• Do not fill boiler or boiler system with softened
water.
• Use only inhibited propylene glycol solutions
certified by fluid manufacturer as acceptable for use
with closed water heating system.
• Thoroughly clean and flush any system that used
glycol before installing new Boiler.
• Provide user with Material Safety Data Sheet
(MSDS) on fluid used.
NOTICE
Boiler rated at 50 psig (345 kPa) maximum allowable
working pressure. Boiler provided with 30 psig (206
kPa) safety relief valve.
NOTICE
System pressure above 43 psi [2.96 bar] WILL result
in boiler shutting down.

6.1 General

• Primary/Secondary piping required by manufacturer.
• Install piping in accordance with authority having jurisdiction.
• Support system piping and safety relief valve discharge
piping. Boiler's internal piping can be damaged if subjected to
excessive weight.
NOTICE
The intended use of the internal heat exchanger pump
is a boiler loop. Do not use as a primary system pump.
• Size central heating pump (and domestic hot water pump, if
used) for system requirements only. Internal heat exchanger
pump compensates for pressure drop through boiler internal
piping and heat exchanger.
• Thoroughly clean and flush system before connecting to boiler.
• If oil is present in system water, use approved detergent to
wash system.

6 - HYDRONIC PIPING

• It is necessary to semi-annually check the water quality of
central heating systems.
• Manufacturer recommends installation of 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 exchange
surfaces and accumulate in pump cavities causing reduced
efficiency and premature wear.
• Flush system to remove any solid objects such as metal chips,
fibers, or Teflon tape, etc.
• Flush system until water runs clean and piping is free of
sediment.
• Use purge valve to flush zoned systems, each zone separately.
If purge valves and isolation valves are not installed, install
them to properly clean the system.
• When purging installations that include standing iron radiators
and systems with manual vents at high points, start with
nearest manual air vent. Open the vent until water flows
out, then close vent. Repeat this procedure, working toward
furthest air vent.
• Install a basket strainer if large amounts of sediment is
present. Keep basket clear of sediment build up.
• Ensure piping in the heating system has an oxygen barrier.

6.2 Special Conditions

Do not expose boiler and condensate piping to freezing
temperatures.
• System piping exposed to freezing conditions: Use
inhibited propylene glycol solutions certified by fluid
manufacturer for use with closed water heating system.
Do not use automotive or ethylene glycol.
• Boiler installed above radiation level (or as required by
authority having jurisdiction). Integral low water pressure
switch is provided in boiler.
• Boiler used in connection with refrigeration system.
Install piping in parallel with boiler, with appropriate
valves to prevent chilled medium from entering boiler.
• System piping connected to heating coils located in air
handling unit exposed to refrigerated air circulation.
Install flow control valves or other automatic means to
prevent gravity circulation of boiler water during cooling
cycle.
27
NOTICE
240012874 REV A, [01/31/2020]