LAARS NeoTherm NTV (Sizes 150–850 MBTU/h) - Install and Operating Manual - Manual (Page 22)

Page 18 LAARS Heating Systems
6A.3 Condensate Drain
A condensate drain trap is built into the NeoTherm unit.
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.
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.
6A.4 Freeze Protection
WARNING
Glycol must not be used in domestic hot water
applications. Refer to Section 6B.4 for instructions on
NTV, domestic hot water freeze protection.
NeoTherm 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. 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.
NOTE: Laars 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.
6A.5 NTH Suggested Piping Schematics
Figures 15 through 21 show suggested piping configurations
for NTH boilers. These diagrams are only meant as a guide.
All components or piping required by local code must be
installed.
6A.6 Recognized Chemicals
The following manufacturers offer glycols, inhibitors, and
anti foamants that are suitable for use in the NeoTherm.
Please refer to the manufacturers instructions for proper
selection and application.
1. Sentinel Performance Solutions Group
2. Hercules Chemical Company
3. Dow Chemical Company