LAARS NeoTherm NTV600 - Install and Operating Manual User Manual
Page 23
NeoTherm Boilers and Water Heaters
Page 21
6A.3 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.
IMPORTANT NOTES: 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.4 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.5 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