Laars NTV, Инструкция по установке и эксплуатации

Страница: 32 / 92

Page 28
LAARS Heating Systems
factory pumps or other pumps are installed, the piping should
be installed such that the pump supplies flow to the heater it
is attached to only. The factory pumps are sized for 30 feet
and 6 elbows of total pipe length, so the heater should be
placed within 15 feet of the tank. If longer runs are required, a
properly-sized field-supplied pump should be used.
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 Figure 23 through Figure
26
.
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
Figure 24 through Figure 26 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 10 on page 17 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.