Laars OMNITHERM ONH1250, Инструкции по сборке, установке и эксплуатации

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Page 27
5.A.3 Freeze Protection
This unit may be installed indoors or outdoors. If installing
outdoors in a location that may experience freezing
temperatures, precautions must be taken to prevent water
in the heat exchanger and condensate inside and outside
of the boiler from freezing. Damage due to freezing water
or condensate is not covered by the warranty. The unit
must not be operated in conditions below 5F (-15C).
If installed outdoors, and there is an event such as
a power outage, interruption of gas supply, failure of
system components, activation of safety devices, etc.,
this may prevent a boiler from firing.
Any time a boiler
is subjected to freezing conditions, and the boiler
is not able to fire, and/or the water is not able to
circulate, there is a risk of freezing in the boiler or
in the pipes in the system.
When water freezes, it
expands. This may result in bursting of pipes, or damage
to the boiler, and this could result in leaking or flooding
conditions.
Do not use automotive antifreeze. To help prevent
freezing, The manufacturer recommends the use of
inhibited glycol concentrations between 20% and 35%
glycol. Typically, this concentration will serve as burst
protection for temperatures down to approximately -5°F
(-20°C). If temperatures are expected to be lower than
-5°F (-20°C), glycol concentrations up to 50% can be
used.
When concentrations greater than 35% are
used, water flow rates must be increased to maintain
the desired temperature rise through the boiler.
WARNING
Glycol must not be used in domestic hot water
applications. Refer to 5.C.4 on page 32 for
instructions on freeze protection for units (domestic hot
water).
Different glycol products may provide varying degrees
of protection. Glycol products must be maintained
properly in a heating system, or they may become
ineffective. Consult the glycol specifications, or the glycol
manufacturer, for information about specific products,
maintenance of solutions, and set up according to your
particular conditions.
The following manufacturers offer glycols, inhibitors,
and anti foamants that are suitable for use in the unit.
Please refer to the manufacturers instructions for proper
selection and application.
• Sentinel Performance Solutions Group
• Hercules Chemical Company
• Dow Chemical Company
The boiler control offers some assistance with freeze
protection, as long as the boiler is energized, and
able to fire.
1. If the outlet sensor detects less than 45°F, the control
energizes the boiler pump.
2. If the outlet sensor detects less than 35°F, the control
will fire the boiler.
3. Once in freeze protect mode, the boiler will remain in
that state until the outlet sensor detects greater than
50°F.
The
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