Section 6A; Water Connections - Bnth Boiler; Bnth System Piping: Hot Supply Connections; Bnth Cold Water Make-Up - Bradford White Brute BNTH Installation And Operation Instructions Manual

Brute
BOILERS AND VOLUME WATER HEATERS

Section 6A -

WATER CONNECTIONS -
BNTH BOILER
Section 6 is divided into two parts. Section
6A covers BNTH units designed for hydronic
heating. Section 6B covers BNTV 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 9 for the connection pipe sizes required.
6A.1 BNTH System Piping -
Hot Supply Connections
NOTE: This appliance must be installed in a closed
pressure system with a minimum of 12 psi (82.7kPa)
static pressure at the boiler.
Hot water piping should be supported by suitable
hangers or floor stands. Do not support piping with
this appliance. Due to expansion and contraction of
copper pipe, consideration should be given to the type
of hangers used. Rigid hangers may transmit noise
through the system resulting from the 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 a drain
or in a manner to prevent injury in the event of pressure
relief. Install an air purger, an air vent, a diaphragm-type
expansion tank, and a hydronic flow check in the system
supply loop. Minimum fill pressure must be 12psig
(82.7kPa). Install shutoff valves where required by code.
BNTH PIPE SIZE,
SIZE INCHES
150 1
210 1¼
285 1¼
399 1¼
500 1½
600 1½
750 2
850 2
Table 11. Water Connection Pipe Sizes
BNTV PIPE SIZE,
SIZE INCHES
150 1¼
199 1¼
285 2
399 2
500 2
600 2
750 2
850 2
Brute's efficiency is higher with lower return water
temperatures. Therefore, to get the most of low return
temperature with multiple boilers, pipe as shown in Figures
17-19.
Brute BNTV models 150-500 can be ordered with or
without a pump included.
Brute BNTH models 80-500 can also be ordered with or
without a pump included.
Brute with a pump MUST be piped in a primary-
secondary fashion (using either piping or a hydraulic
separator) such that the pump that is mounted on the
boiler ONLY serves the boiler.
When the pump is supplied by Bradford White, the Brute
boiler must be located within 15 feet (4.6m) of the supply
and return header (or the hydraulic separator). Pumps
supplied by Bradford White are sized for a maximum
of 30 feet (9.1m) of connection size piping and the
headloss of the boiler only. (See Table 7.)
If longer pipe lengths are required, the pump should be
sized for the boiler per Table 7 and for the piping it will
serve, and should be supplied to job separately. Even
with pumps supplied by others, Bradford White strongly
recommends primary-secondary piping.
6A.2 BNTH Cold Water Make-Up
1. Connect the cold water supply to the inlet
connection of an automatic fill valve.
2. Install a suitable back flow preventer between the
automatic fill valve and the cold water supply.
3. Install shut off valves where required.
The boiler piping system of a hot water heating boiler
connected to heating coils located in air handling
appliances where they may be exposed to refrigerated
air circulation must be equipped with flow control valves
or other automatic means to prevent gravity circulation
of the boiler water during the cooling cycle.
A boiler installed above radiation level, or as required by
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