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3.8 COMBUSTION CAL MENU
The Combustion Cal (Calibration) Menu is protected by the level 2 password (6817) which must
be entered to view or change the menu items shown in Table 3-6. These menu items 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 (% open). 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.
CAL Voltage 16%
CAL Voltage 30%
CAL Voltage 45%
CAL Voltage 60%
CAL Voltage 80%
CAL Voltage 100%
SET Valve Position
Blower Output
Set Stdby Volt
Oxygen Level
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 (SSOV) Proof of Closure (POC) switch
• Low Water Level switch
• High Water Temperature switch
• High Gas Pressure switch
• Low Gas Pressure switch
• Blower Proof switch
• Blocked Inlet 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.
OMM-0097_0C
GF-142
Benchmark 1500 - 2000 Boilers
CHAPTER 3 – OPERATION
Table 3-6: Combustion Cal Menu
Menu Item Display
BMK 1500
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
Ph.: 800-526-0288
BMK 2000
CAL Voltage 14%
CAL Voltage 30%
CAL Voltage 45%
CAL Voltage 60%
CAL Voltage 80%
CAL Voltage 100%
SET Valve Position
Blower Output
Set Stdby Volt
Oxygen Level
Page 43 of 184
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