AERCO BMK 1500-2000 - Manual (Page 46)

Benchmark 1500 - 2000 Boilers
CHAPTER 3 – OPERATION
Page 46 of 188 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0097_0D
Ph.: 800-526-0288
GF-142
Menu Item Display
Available Choices or Limits
Default
Minimum Maximum
Err Threshold 1 9 5
SSD Temp Format Degrees Points Degrees
BST Upld Timer 0 9999 sec 0
3.10 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.
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
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) switch in the downstream
Safety Shut-Off Valve (SSOV) is closed. See Figure 3-3 for SSOV location.