Bradford-White Corp 500-1825

BRADFORD WHITE

Page 10

If the heater-to-tank circulating loop contains

more than 6 elbows or 30 feet of pipe, use

pipe or ttings in the loop no smaller than the

following:

Model Pipe Size

500 through 850 2-1/2"

1010 through 1825 3"

Pump performance requirements are provided in

Table 4 for reference purposes.

To assure free circulation, do not use globe

valves, side outlet tee connections or other

restrictive ttings in heater-to-tank loop.

2. Copper Brute heaters are not suitable for heating

swimming pools or any other application where

temperature of the water owing through the

heater remains below the dew point (110°F).

In applications requiring the rapid use of

measured volumes of water, the recovery of the

heater between the time intervals of use must

equal the volume used.

2.9 Water Pressure

It is very important that water pressure in the

system be maintained above 30 psi. If the system

pressure should drop below this, the vapor pressure

of water in the suction side of the pump can cause

hammer and cavitation in the pump and damage the

heater through lack of water circulation.

2.10 Tank Installation

1. Be sure the oor is waterproof and structurally

capable of supporting the tank when it is lled

with water.

2. The tank should be placed so that manholes,

inspection covers, nameplates and drain valves

are accessible.

3. Be sure the tank is suitable for the water in the

system. Some water is corrosive and requires a

protected tank with a special lining.

4. If the tank is glass-lined, it should be equipped

with a suitable magnesium anode. It is good

practice to replace the anode when it is

approximately 50% used. The factory warranty

on a glass-lined tank will be void if a satisfactory

anode is not in place at the time of a failure or if

it is consumed by cathodic action.

5. Make sure the tank connections in the heater-

tank circulating loop are the proper size as listed

in Section 2.8. If tappings are smaller than the

recommended pipe size, a larger pump may be

required. Consult the factory if in doubt.

6. Install a pipe in the tank drain tting that goes to

a oor sink, and install a drain valve. If a oor

sink is not available, install a hose bib.

7. Hot water tanks in an existing installation are

likely to have a deposit of silt on the bottom.

Therefore, it is important to extend the pump

suction pipe in the tank to a position near the top.

Pipe the return from the heater to the bottom of

the tank.

8. Incorrect installation can cause rapid failure

of water tanks due to electrolysis. Tanks must

be installed with dielectric connections to

electrically isolate the tank from stray current.

Note that the use of brass or bronze connectors

does not replace the need for dielectric

connections.

Flow Head* Temp. Rise

Water Rate Loss Across

Model Category (GPM) (ft.) Heater, (°F)

Soft 45 5.0 17

500 Normal 68 9.9 11

Hard 90 15.7 8

Soft 45 5.1 20

600 Normal 68 10.0 14

Hard 90 15.9 10

Soft 45 5.3 24

715 Normal 68 11.0 16

Hard 90 17.8 12

Soft 45 5.4 30

850 Normal 68 11.1 20

Hard 90 18.1 15

Soft 45 3.9 35

1010 Normal 68 7.5 23

Hard 90 11.7 18

Soft** 68 7.8 27

1200 Normal 68 7.8 27

Hard 90 12.2 21

Soft** 68 8.1 32

1430 Normal 68 8.1 32

Hard 90 12.6 24

Soft** 68 8.3 37

1670 Normal 68 8.3 37

Hard 90 13.0 28

Soft** 90 13.5 30

1825 Normal** 90 13.5 30

Hard 90 13.5 30

Water Category Grain Hardness per Gal.

Soft 1 through 7.5

Normal 7.6 through 17

Hard Over 17

* Pressure drop includes loss through 30 feet of pipe and normal ttings when

heater is installed with storage tank. Pipe and ttings are assumed to be 2" on

Models (500-850) and 2 1/2" on Models (1010-1825)

** To prevent erosion, these models must be ordered with cupro-nickel heat

exchanger tubes.

Table 4. Pump Performance Requirements.