LAARS NeoTherm LC NTV1700 - Install and Operating Manual - Manual (Page 25)

NeoTherm LC Boilers and Water Heaters Page 21
6A.3 NTH Freeze Protection
WARNING
Glycol must not be used in domestic hot water
applications. Refer to Section 6B.4 for instructions
on freeze protection for NTV units (domestic hot
water).
NeoTherm LC’s may be installed indoors or
outdoors. If installed outdoors, the NTH unit
must never be installed in a location which may
experience freezing temperatures. If installed
indoors, 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, Laars 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 a 20°F to 25°F temperature
rise through the boiler.
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 NeoTherm LC. Please refer to the
manufacturers instructions for proper selection and
application.
• Sentinel Performance Solutions Group
• Hercules Chemical Company
• Dow Chemical Company
6A.4 NTH Suggested Piping Schematics
Figures 12 through 16 (the next several pages) show
suggested piping configurations for NTH boilers.
These diagrams are only meant as guides. All
components or piping required by local code must
be installed.
6A.5 Condensate Drain Trap
A condensate drain trap is included with the
NeoTherm LC and is designed to drain the boiler
of condensate. The vent condensate should be
drained through a drain tee located in the vent line.
This will help prevent excessive condensate from
entering the boiler condensate trap and preventing
the boiler from operating.
Connect a 3/4” PVC pipe between the drain
connection and a floor drain (or condensate pump if
a floor drain is not accessible).
The condensate drain must be installed to prevent
the accumulation of condensate. When a condensate
pump is not used, the tubing must continuously
slope downward toward the drain with no spiraling.
Consult local codes for the disposal method.
Caution
Condensate is mildly acidic (pH=5), and may
harm some floor drains and/or pipes, particularly
those that are metal. Ensure that the drain,
drainpipe, and anything that will come in
contact with the condensate can withstand the
acidity, or neutralize the condensate before
disposal. Damage caused by failure to
install a neutralizer kit or to adequately treat
condensate will not be the manufacturer’s
responsibility.