16
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.
5.2 Special Conditions
Do not expose boiler and condensate piping to
freezing temperatures.
5 - HYDRONIC PIPING
• \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.
• Manufacturer recommends a water treatment product
be used for sediment removal.
• 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.
• Ensure piping in the heating system has an oxygen
barrier.
• If using antifreeze solution do not exceed 50% glycol.
PN 240012363 REV. A [08/31/2018]
