AERCO BMK 1.5 LN Dual Fuel Feb 2013 - Manual (Page 38)

CHAPTER 3: CONTROL PANEL OPERATION
Page 38 of 162 PR2: 05/09/12
Benchmark 1.5LN Dual-Fuel Low NOx Boiler
Operation and Maintenance Manual
OMM-0041_0C
GF-121
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288
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
2.9 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
• 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.
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.
1. The DEMAND LED status indicator will light.
2. The unit checks to ensure that the Proof of Closure (POC) switches in both the gas and
propane Safety Shut-Off Valves (SSOV) are closed. See Figure 3-3 for SSOV
locations.
3. With all required safety device switches closed, a purge cycle will be initiated and
the following events will occur:
a) The Blower relay energizes and turns on blower.
b) The Air/Fuel Valve rotates to the full-open purge position and closes purge position
switch. The dial on the Air/Fuel Valve (Figure 3-4) will read 100 to indicate that it is
full-open (100%).
c) The VALVE POSITION bargraph will show 100%.