Bradford White BWCH Operations Instructions download pdf (Page 40)

Page 40

BRADFORD WHITE CORP.

Programming. Mode 2 is used in primary-secondary

piping hydronic systems without outdoor reset. Mode

5 adds outdoor reset.

Step 1: Install the additional sensor in the

primary loop (see Figure 4), and wired to the “SC2”

and “SUPS” terminals on the eld wiring panel

(Figure 23).

Step 2: Remove the factory-installed jumper

between the “HtD” and “ComD” terminals on the

eld wiring panel (Figure 14), and connect a zone

valve or pump end switch or other contact closure

device (aquastat, etc.) to these terminals to provide an

indication of heat demand in the system.

Note: The boiler must have an indication of heat

demand to re. If a zone valve or pump end switch is

not connected to the “HtD” and “ComD” terminals, the

jumper must be left in place. However, the boiler pump

(if equipped) and any pump connected to a contactor

wired to the PMP-PMP terminals on the eld wiring

panel will run continuouslyand not cycle off according

to the setting for the Pump Delay. In addition, the LCD

screen will always show “dem” (demand) and will not

allow cycling of the display to verify all the sensor

settings.

Step 3: Press the three programming buttons

to enter ADJUST mode (Figure 25). Press Item to

select the programming item, and the

ARROW keys

to adjust the setting. See Section 6.3 Programming

the Temperature Control if more programming

instructions are needed.

Recommended settings for hydronic system with

180°F / 83°C primary loop temperature:

Item F° C°

MODE 2 2

BOIL TARGET 180 83

BOIL MASS 1 1

DIFF 20 10

DLY 5:00 5:00

F° F° °C

Step 4: See Section 6.4.11 Limit Controls. Set

both high limit controls at least 25°F / 14°C higher

than the BOIL TARGET to allow for temperature rise

across the heat exchanger.

6.3.4 Choosing the Mode for your

Application

This section describes various applications and

the recommended eld wiring and Mode selections.

Mode 1:

Boiler operates using its own inlet

and outlet sensors only, not relying

on a remote thermostat, aquastat,

or external sensor.

This setup is most commonly found in domestic

hot water applications with a continuous run pump.

This is not recommended for other applications.

The Copper Brute II is shipped with a jumper

between the “Com D” and “Ht D” terminals, which

must remain in place to allow the unit to re. The unit

will re whenever the outlet temperature cools below

the target temperature.

Important Note: If the Copper Brute II is pump-

mounted at the factory, or if a eld-supplied pump

contractor is connected to the Copper Brute II’s pump

contactors

(Pmp Pmp), the user must program the controller’s

pump delay (DLY) setting to ON. When ON is selected,

pump operation is continuous. The unit’s inlet and

outlet sensors must be able to detect the temperature

in the storage tank in order to control it. Without the

tank water continuously running through the heater,

the heater will have no way of knowing what the

temperature in the tank is, and will not be able to

respond to a change in tank temperature. Short cycling

or lack of hot water may result if the pump does not

run continuously.

Mechanical aquastat in a domestic hot

water storage tank.

Remove the jumper from the “Com D” and

“HtD” terminals and connect the aquastat’s leads to

these terminals. This connection uses a standard, non-

powered mechanical aquastat. When the aquastat calls

for heat, the Copper Brute II’s temperature control will

respond and start the boiler pump (if equipped) and

re the boiler.

If the Copper Brute II is not a pump mounted

model, a 24VAC pump contactor may be connected to

the “PMP” terminals to control a eld installed pump.

(If desired, the pump can run continuously, with the

aquastat telling the heater when to re.)

Program the temperature control to use Mode 1.

The

AUTO/MAN switch must be in the AUTO position in

this mode.

Mode 3:

Bradford White R2014800 sensor

installed in the domestic hot water

storage tank.

The Copper Brute II ships with a jumper between

the “Com D” and “Ht D” terminals. Verify this jumper

is in place, and connect the sensor leads to the “S C2”

and “SUP S” terminals. When the sensor detects a

temperature below the target temperature, the control

will respond and start the heater pump (if equipped)

and re the heater.

If the heater is not a pump mounted model, a

24VAC pump contactor may be connected to the

“PMP” terminals to control a eld installed pump. (If

desired, the pump can run continuously).

Program the temperature control to use Mode 3.

The

AUTO/MAN switch must be in the AUTO position in

this mode.

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