Laars Neotherm NTH, Installation And Operation Instruction Manual

Page: 35 / 104

Page 35
Connect a 3/4” PVC pipe between the drain connection
and a floor drain (or a condensate pump if a floor drain
is not accessible).
The condensate drain must be installed so as to prevent
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 proper disposal method for the
condensate.
If installing 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.
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.
6.A.4 Freeze Protection
WARNING
Glycol must not be used in domestic hot water
applications. Refer to Section 6B.4 for instructions on
Heater, domestic hot water freeze protection.
Indoor units are certified for indoor use only. Outdoor
units are additionally certified for outdoor use.
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. To help prevent
freezing, 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.
NOTE: Manufacturers supplied pumps are not all
capable of maintaining the reduced temperature rise
required with glycol concentrations greater than
35%. If glycol concentrations required are greater
than 35% a field supplied pump should be used.
Caution
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.
6.A.5
Boiler Suggested Piping Schematics
Figure 22 through Figure 28 show suggested piping
configurations for Boilers. These diagrams are only
meant as a guide. All components or piping required by
local code must be installed.
6.A.6 Recognized Chemicals
The following manufacturers offer glycols, inhibitors,
and anti foamants that are suitable for use in these
units. Please refer to the manufacturers instructions for
proper selection and application.
1. Sentinel Performance Solutions Group
2. Hercules Chemical Company
3. Dow Chemical Company
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Commercial Boilers and Water Heaters