LAARS NeoTherm NTV (Sizes 150–850 MBTU/h) - Install and Operating Manual - Manual (Page 31)

Page 27 N eo T herm Boilers and Water heaters
6B.3 Cold Water Make-Up
The cold water make-up may be connected to the tank or to
the inlet of the boiler as shown in Figures 22-25 . Install back
flow preventers and shut offs where needed or required by
code. Pipe sizes may have to be increased to accomodate cold
water make-up flow.
6A.4 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.
6B.5 Freeze Protection
NeoTherm heaters are not certified for outdoor installation,
so the chance of freezing is minimized. In an event such as
power outage, component failure or other issue when freezing
is likely, the heater and system must be drained to avoid the
risk of damage due to freezing. Glycol must not be used in
volume water heating applications.
6B.6 NTV Suggested Piping Schematics
Figures 23-25 show suggested piping configurations for
NTV boilers. These diagrams are only meant as guides.
All components or piping required by local code must be
installed.
6B.7 NTV Suggested Pumps
Possible pumps for NTV sizes 600-850 are Grundfos
model TP 40-160/2B, or for size 600 (only) is Armstrong
model E22B. See Table 8 for heater water flow and head
requirements.
Note - The head loss for the piping, fittings, and accessories
must be calculated and added to the heater head loss to get the
total required pump head. An undersized pump will result in
insufficient flow. The can result in scale buildup and failure
of the heat exchanger.