Bradford-White Corp Modulating Boiler, BNTV warranty A Water Connections - BNTH Boiler

Page 20 BRADFORD WHITE CORP.

SECTION 6A.

Water Connections - BNTH Boiler

Section 6 is divided into two parts. The first is for BNTH models and is Section 6A. The second is for BNTV models and is Section 6B. Refer to the proper section for instructions in installing and piping your product. Refer to Table 9 for 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.

Suggested piping diagrams are shown in Figures 15 through 21. These diagrams are meant only as a guide. Components required by local codes must be properly installed.

Brute Elite'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 Elite BNTH models can be ordered with or without a pump included.

Brute Elite 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 Elite 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 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 the authority having jurisdiction, must be provided with a low water cutoff device either as a part of the boiler or at the time of boiler installation.

BNTH	PIPE SIZE,	BNTV	PIPE SIZE,
SIZE	INCHES	SIZE	INCHES
80	1	–	n/a
105	1	–	n/a
150	1	150	1¼
210	1¼	199	1¼
285	1¼	285	2
399	1¼	399	2
500	1½	500	2
600	1½	600	2
750	2	750	2
850	2	850	2

Table 9. Water Connection Pipe Sizes.