Laars Mascot II, Installation And Operation Instructions Manual

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LAARS Heating Systems
Page 18
air circulation must be equipped with flow control
valves or other automatic means to prevent gravity
circulation of the boiler water during the cooling cycle.
A boiler installed above radiation level, or as
required by the authority having jurisdiction, must be
provided with a low water cutoff device at the time of
boiler installation.
6.3 Freeze Protection
Mascot II units are certified for indoor use only,
and are not design-certified for placement outdoors.
Proper precautions for freeze protection are
recommended for boiler installations in areas where the
danger of freezing exists.
Power outage, interruption of gas supply, failure of
system components, activation of safety devices, etc.,
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 which
may result in bursting of pipes, or damage to the boiler,
which could result in leaking or flooding conditions.
Do not use automotive antifreeze or ethylene
glycol. To help prevent freezing, Laars recommends the
use of inhibited propylene 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.
NOTE: Laars supplied pumps are not all capable of
maintaining the reduced temperature rise required
with glycol concentrations greater than 35%.
Figure 13. Hydronic Piping — High and low temp zones with indirect water heater (LMH using internal 3-way).