Bradford White BWCH Operations Instructions download pdf (Page 37)

Page 37

COPPER BRUTE II (500 - 2000)

radiation units and high points in the system

piping, as described in Step 4.

12. Close make-up water valve and check strainer in

pressure reducing valve for sediment or debris

from the make-up water line. Reopen make-up

water valve.

13. Check gauge for correct water pressure and also

check water level in the system. If the height

indicated above the boiler insures that water is at

the highest point in the circulating loop, then the

system is ready for operation.

14. Refer to local codes and the make-up water

valve manufacturer’s instructions as to whether

the make-up water valve should be left open or

closed.

15. After placing the unit in operation, the ignition

system safety shutoff device must be tested. First,

shut off the manual gas valve, and call the unit

for heat. After the pre-purge and ignitor heat-up

time, the main gas terminals will be energized,

attempting to light, for four (4) seconds, and then

will de-energize. The unit will go into lockout

mode. Second, turn the power off and then on

again, open the manual gas valve and allow the

unit to light. While the unit is operating, close the

manual gas valve and ensure that power to the

main gas valve has been cut.

16. Within three (3) days of start-up, recheck all air

bleeders and the expansion tank as described in

Steps 4 and 8 above.

Important: The installer is responsible for identifying

to the owner/operator the location of all emergency

shutoff devices.

WARNING

Do not use this appliance if any part has been

under water. Immediately call a qualied service

technician to inspect the appliance

and to replace any part of the control system and

any gas control that may have been

under water.

6.3 Programming the Temperature

Control

The same temperature control is used on all

versions of the Copper Brute II (in two-and four-stage

congurations), providing maximum exibility to meet

the needs of any system. Before start-up, you must

program the temperature control for the type of system

you have. You must determine the type of piping the

system has, the mode the temperature control will

operate in, and the various settings for that mode.

6.3.1 System Piping

“Primary Secondary Piping”

In the context of these instructions, “primary

secondary piping” means the boiler provides heat to a

plumbing loop that has, in turn, one or more plumbing

loops connected to it, which provide heat to radiant

tubing, radiators, DHW heat exchangers, etc. This

plumbing loop is the “primary loop.”

In primary secondary piping modes, the

temperature control monitors the primary loop

temperature. The extra sensor that is shipped loose

with Copper Brute II is installed in the primary loop.

The temperature control res the boiler stages to

provide the “target temperature” at that sensor. Over

time, the temperature control will learn the system

curve and adjust the ring of the stages to meet the

demand in the most efcient way.

For complex systems, with variable speed

injection circulators, multiple temperature zones, etc.,

you may need to consult with a qualied engineer or

Bradford White Applications Engineering.

“Parallel Piping”

The term “parallel piping” means the Copper

Brute II is supplying heat directly to one or more

storage tanks, radiators, radiant zones, etc., plumbed

in series. In these systems, the target temperature is

the boiler’s outlet temperature. An exception is for

domestic hot water systems using mode 3, where the

extra sensor is placed in the tank.

6.3.2 Choosing the Mode

There are six modes of operation for the Copper

Brute II temperature control. The loose sensor must

be installed and connected prior to programming the

temperature control, as it provides sensing the “target”

temperature. The location of the sensor is dependent

on the type of piping used. Figures 4 through 8 show

suggested locations for the temperature sensor in

various hydronic piping congurations.

Modes 1 through 5 are the automatic modes,

requiring the diagnostic panel’s

AUTO/MAN switch

(located on the slide-out control drawer) to remain in

the default

AUTO position. These modes enable the

temperature control to re the Copper Brute II’s stages

to meet the demand of the system. In these modes,

the Copper Brute II temperature control continuously

samples the inlet, outlet and target temperatures.

Mode 6 is the manual mode, and the

AUTO/

MAN

switch must be moved to the MAN position. An

external control, such as a building automation system

or multiple boiler control, just be wired to the eld

wiring panel in order to re the boiler, bypassing the

temperature control (see Section 5.3 for important

information about external staging controls and

building automation systems).

Table 11 contains information to identify the

mode you should use for your system.

6.3.3 Programming

Before programming, you must determine the

type of piping you have, the mode you will use, and

install the extra sensor if required for that mode. See

Sections 6.3.1 and 6.3.2 for more information, or

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