Bradford White BWCH Operations Instructions download pdf (Page 14)

Page 14

BRADFORD WHITE CORP.

20°F 25°F 30°F 35°F

SIZE ow H/L ow H/L ow H/L ow H/L

gpm feet gpm feet gpm feet gpm feet

500 43 1.7 34 1.1 28 0.9 24 0.7

750 64 3.3 51 2.3 43 1.7 36 1.2

1000 85 5.0 68 3.6 57 3.1 49 2.2

1250 106 8.1 85 6.1 71 4.7 61 3.4

1500 128 10.0 102 7.2 85 5.5 73 4.2

1750 N/R N/R 119 10.5 99 8.4 85 5.8

2000 N/R N/R 136 12.5 113 10.4 97 8.3

Metric Equivalent

11°C 14°C 17°C 19°C

SIZE ow H/L ow H/L ow H/L ow H/L

lpm m lpm m lpm m lpm m

500 161 0.5 129 0.3 107 0.3 92 0.2

750 241 1.0 193 0.7 161 0.5 138 0.4

1000 321 1.5 257 1.1 214 0.9 184 0.7

1250 401 2.5 322 1.9 269 1.4 231 1.0

1500 483 3.0 386 2.2 322 1.7 276 1.3

 1750 N/R N/R 451 3.2 375 2.6 322 1.8

 2000 N/R N/R 515 3.8 429 3.2 368 2.5

Notes: gpm = gallons per minute, lpm = liters per minute,

H/L = headloss, ft = headloss in feet, m = headloss in meters.

Maximum temperature rise is 35°F (19°C), as shown.

Headloss is for boiler’s heat exchanger only.

N/R = not recommended.

Table 8. Water Flow Requirements - BWCH.

SECTION 4A.

Water Connections —

Copper Brute II Boiler

4A.1 Heating System Piping:

Hot Supply Connections — Boiler

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 oor 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" 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

ow check in the system supply loop. Minimum ll

pressure must be 12psig (82.7kPa). Install shutoff

valves where required by code.

Suggested piping diagrams are shown in Figures

4 through 8. These diagrams are meant only as a guide.

Components required by local codes must be properly

installed.

Note the recommended location of the

temperature sensor on the diagrams; you must provide

a location for the additional sensor shipped with

the Copper Brute II. This sensor may be strapped

onto pipe from 1" to 4" diameter, or inserted into an

immersion well.

4A.2 Cold Water Make-Up — Boiler

1. Connect the cold water supply to the inlet

connection of an automatic ll valve.

2. Install a suitable back ow preventer between the

automatic ll valve and the cold water supply.

3. Install shut off valves where required.

NOTE: The boiler, when used in connection with a

refrigeration system, must be installed so the chilled

medium is piped in parallel with the boiler with

appropriate valves to prevent the chilled medium from

entering the boiler.

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 ow

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.

4A.3 Water Flow Requirements — Boiler

A hydronic heating (closed loop) application

re-circulates the same uid in the piping system. As a

result, no new minerals or oxygen is introduced into

the system. To ensure a proper operating temperature

leading to long boiler life, a ow rate has been

established based on the uid temperature rise for this

specic size boiler.

Pump-mounted boilers can be ordered for use in

primary secondary piping systems. The pumps used

are sized for the headloss through the heater, plus 30

feet (9.1m) of full-sized piping (same size as boiler

outlet) and a normal number of ttings.

Table 8 species water ow rates for boilers,

which will enable the user to size a pump. The

headloss shown is for the heater only, and the user

will need to add the headloss of the system piping to

properly size the pump.

The minimum inlet water temperature for the

Copper Brute II is 120°F (49°C) to avoid condensing

on the copper coils.

4A.4 Freeze Protection — Boiler

Boiler installations are not recommended in

areas where the danger of freezing exists unless proper

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