Control panel operating procedures – AERCO BMK 1.5 LN Dual Fuel June 2010 User Manual

Page 30

Advertising
background image

CONTROL PANEL OPERATING PROCEDURES

3.7 TUNING MENU

The Tuning Menu items in Table 3-5 are Factory
set for each individual unit. Do not change
these menu entries unless specifically requested
to do so by Factory-Trained personnel.

3.8 COMBUSTION CAL MENU

The Combustion Cal (Calibration) Menu items in
Table 3-6 are used to vary the speed of the
unit’s blower motor based on air temperature
and air density at prescribed Air/Fuel Valve

positions. This is accomplished by providing a
DC drive voltage to the motor which adjusts the
rotational speed of the blower to maximize
combustion efficiency and ensure the unit
conforms to the Nitrogen Oxide (NOx) and
Carbon Monoxide (CO) emissions specified in
Chapter 4. The valve positions (%) and default
drive voltages are listed in Table 3-6.


Table 3-5. Tuning Menu

Available Choices or Limits

Menu Item Display

Minimum

Maximum

Default

Prop Band

1°F

120°F

70°F

Integral Gain

0.00

2.00

1.00

Derivative Time

0.0 min

2.00 min

0.00 min

Reset Defaults?

Yes, No, Are You Sure?

No

Table 3-6. Combustion Cal Menu

Available Choices or Limits

Menu Item Display

Minimum

Maximum

Default

CAL Voltage 16%

.25

8.20

1.80v

CAL Voltage 30%

.25

8.20

3.20v

CAL Voltage 45%

.25

8.20

3.70v

CAL Voltage 60%

.25

8.20

3.80

CAL Voltage 80%

.25

8.20

4.60

CAL Voltage 100%

.25

8.20

6.00

SET Valve Position

0%

100%

0%

Blower Output

Monitor Blower Output Voltage

.00


3.9 START SEQUENCE

When the Control Box ON/OFF switch is set to
the ON position, it checks all pre-purge safety
switches to ensure they are closed. These
switches include:
• Safety Shut-Off Valve Proof of Closure

(POC) switch

• Low Water Level switch
• High

Water

Temperature

switch

• High Gas Pressure switch
• Low Gas Pressure switch
• Blower Proof switch

If all of the above switches are closed, the
READY

light above the ON/OFF switch will light

and the unit will be in the Standby mode.

When there is a demand for heat, the following
events will occur:

NOTE

If any of the Pre-Purge safety device
switches are open, the appropriate fault
message will be displayed. Also, the
appropriate fault messages will be displayed
throughout the start sequence, if the
required conditions are not observed.

3-8

Advertising