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Boiler rated at 50 psig (345 kPa) maximum
Note
allowable working pressure. Boiler provided with
50 psig (345 kPa) safety relief valve.
When installing safety relief valve it must be
Note
installed in a vertical position with spindle at top.
FIGURE 5-1 Safety Relief Valve
System
System
Supply
Supply
Safety Relief
Safety Relief
Valve
Valve
TP Gauge
TP Gauge
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.
5.1 General
• Primary/Secondary piping required.
• Install piping in accordance with authority having
jurisdiction.
5 - HYDRONIC PIPING
• Support system piping and safety relief valve discharge
piping. Boiler's internal piping and wall mount bracket can
be damaged if subjected to excessive weight.
• 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.
• It is necessary to semi-annually check the water quality of
System
System
Return
Return
central heating systems.
• Flush system to remove any solid objects such as metal
chips, fibers, or Teflon tape, etc.
• 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.
• Install 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 exchange surfaces and
accumulate in pump cavities causing reduced efficiency
and premature wear.
• Flush system until water runs clean and piping is free of
sediment.
• Manufacturer recommends a water treatment product be
used for sediment removal.
5.2 Special Conditions
Note
• 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.
11
Do not expose boiler and condensate piping to
freezing temperatures.
PN 240011654, Rev. J [01/31/2020]
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