Bradford-White Corp Copper Brute II Hydronic Boiler Manuale Utente

Page 36

A call for heat can be initiated either 

automatically (auto mode) under thermostatic control 
by the Copper Brute II temperature control, or by an 

external contact closure (manual mode).

In auto mode, the Copper Brute II burner will 

fire its stages of input to maintain a target temperature 

programmed into the temperature control. The 
controller can be programmed per 

Section 6.3.

In manual mode, an external control will control 

the Copper Brute II stages, as long as the Copper 

Brute II control is set to mode 6, and the auto/manual 
switch (located inside the control compartment) is set 

to manual.

The amber 

 light on the front panel 

indicates that the control system is energized. Upon 
a call for heat, the green 

 indicator on the front 

panel will light.

If the unit is pump-mounted, the pump will be 

energized. The pump terminals on the field-wiring 

terminals strip will energize a field pump that is 

properly interlocked with the Copper Brute II. The 
green 

 indicator on the front panel will light.

Once the water flow switch makes, and if all of 

the safety interlocks are closed, the ignition module 

will energize the blower(s) for a 15-second pre-purge, 

followed by a 20-second period to allow the ignitor to 

heat.

Energizing the blower pressurizes the air box 

(which supplies air to the burners) and closes the 

normally-open contact(s) of the airflow pressure 

switch(es). This allows the ignition module to proceed 

with the ignition sequence.

The blocked flue pressure switch senses the 

pressure in the plenum. It will interrupt the airflow 

sensing circuit if this pressure exceeds a maximum 

value. If airflow is not proven, the ignition module  

will lockout.

The ignition module checks that the ignitor 

current has reached a minimum value and energizes 

the gas valve at the end of the ignitor heating period. 
The green 

 indicator on the front panel will 

light, indicating that the stage 1 gas valve is open. 

After a 4-second trial for ignition, the ignitor 

switches off, and unless a flame is detected by the 

flame sensor, the gas valve will close and the ignition 
module will either attempt ignition again (up to three 
times) or will lockout (if the optional lockout ignition 

module is used).

If flame is sensed, the burner will continue to 

fire as long as there is a call for heat. In Auto mode, 

additional stages are delayed by a minimum of 60 
seconds (less prepurge and ignitor warm-up time) and 

once energized, must fire for at least 30 seconds. The 
request for additional stages is indicated on the control 

display, and the energizing of additional burner stages 

is indicated by front panel lights.

If there is a subsequent loss of flame signal, the 

burner will attempt re-ignition up to three times (only 

once if optional lockout ignition module is used.)

When the call for heat is satisfied, the gas 

valve(s) closes and the blower(s) continues to run 

for 30 seconds. The pump will continue to run for a 

minimum of 20 seconds and up to a programmable 

maximum of 10 minutes.

If a call for heat is prevented from being satisfied 

either by a safety interlock or due to an ignition 
lockout, the red 

 indicator on the front panel 

will light. To reset the standard ignition module, 

the reset button on the module must be pressed. 
Interrupting power to this module will not reset the 

lockout.

The Copper Brute II 1000–2000 models have 

two ignition modules that control different burners. If 
one module should fail for any reason, the remaining 
module can operate its burner(s) independently.

1.  Ensure the system is fully connected. Close all 

bleeding devices and open make-up water valve. 

Allow system to fill slowly.

2.  If make-up water pump is employed, adjust 

pressure switch on pumping system to provide 

a minimum of 12 psi (81.8 kPa) at the highest 

point in the heating loop.

3.  If a water pressure regulator is provided on the 

make-up water line, adjust the pressure regulator 

to provide at least 12 psi (81.8 kPa) at the highest 

point in the heating loop.

4.  Open bleeding devices on all radiation units 

at the high points in the piping throughout 
the system, unless automatic air bleeders are 

provided at such points.

5.  Run system circulating pump for a minimum of 

30 minutes with the boiler shut off.

6.  Open all strainers in the circulating system, 

check flow switch operation, and check for 

debris. If debris is present, clean out to ensure 

proper circulation.

7.  Recheck all air bleeders as described in 

Step 4.

8.  Check liquid level in expansion tank. With the 

system full of water and under normal operating 

pressure, the level of water in the expansion tank 

should not exceed ¼ of the total, with the balance 

filled with air.

9.  Start up boiler according to the procedure in this 

manual. Operate the entire system, including the 

pump, boiler, and radiation units for one (1) hour.

10.  Recheck the water level in the expansion tank. If 

the water level exceeds ¼ of the volume of the 

expansion tank, open the tank drain, and drain to 

that level.

11.  Shut down the entire system and vent all