Installation / Operation Instruction Manual

Page 42
B RADFORD W HITE
or to the inlet of the boiler as shown in Figure 29 through
Figure 32. Install back ow preventers and shut o󰀨s
where needed or required by code. Pipe sizes may
have to be increased to accomodate cold water make-
up ow.
6.B.4 Condensate Drain
A condensate drain trap is built into the unit.
Connect a 3/4” PVC pipe between the drain connection
and a oor drain (or a condensate pump if a oor 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 oor 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.B.5 Freeze Protection
These un are certied for outdoor use but they should not
be subjected to freezing temperatures. 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.
6.B.6 Heater Suggested Piping Schematics
Figure 29 through Figure 32 show suggested piping
congurations for Heater boilers. These diagrams are
only meant as guides. All components or piping required
by local code must be installed.
6.B.7 Heater Suggested Pumps
Possible pumps for NTV 750 & 850 are Taco
1911D2E11662223. See Table 13 for heater water ow
and head requirements.
Note - The head loss for the piping, ttings, 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 insu󰀩cient ow which can
result in scale buildup and failure of the heat exchanger.
SECTION 6
WATER CONNECTIONS - Part B
Section 6 is divided into two parts. Section
6A covers Boiler units designed for hydronic
heating. Section 6B covers Heater models,
which are designed exclusively for “volume
water” domestic hot water applications. Refer
to the proper section for instructions on
installing and piping your product. Refer to
Table 14 on page 34 for the connection pipe
sizes required.
6.B Water Heater
6.B.1 Heater Water Quality
Heater water heaters must be installed in water
conditions of 10gpg hardness or less with a pH range
of 8.2 to 9.5. Operating the Heater in water with
higher hardness levels will cause heat exchanger
fouling, erosion, or corrosion leading to premature
component failure, reduced e󰀩ciency, heat exchanger
failure or system failure. Failure of this type will not be
warranted. If the water in use exceeds the conditions
recommended, a water softener or other device should
be installed to improve water quality.
6.B.2 Piping Requirements
Water piping should be supported by suitable hangers
and oor stands. Do not support piping with the
appliance. Due to expansion and contraction of copper
pipe, consideration should be given to the type of
hangers and supports used. Rigid hangers may transmit
noise through the system resulting from piping sliding in
the hangers. It is recommended that padding be used
when rigid hangers are installed. Maintain 1” (2.5cm)
clearance to combustibles for hot water pipes.
Pipe the discharge of the relief valve (full size) to the
drain or in a manner to prevent injury in the event of
pressure relief. Install a diaphragm-type expansion
tank, ow check, and shuto󰀨 valves where needed or as
required by code.
Most units can be ordered with pumps. Whether the
factory pumps or other pumps are installed, the piping
should be installed such that the pump supplies ow 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 eld-supplied
pump should be used.
See Section 5.2 and Table 13
6.B.3 Cold Water Make-Up
The cold water make-up may be connected to the tank