Start Sequence - Watts AERCO Benchmark 2.0LN User Manual

Benchmark 2.0LN Dual-Fuel Low NOx Boiler
CHAPTER 3: CONTROL PANEL OPERATION
Menu Item Display
CAL Voltage 20%
CAL Voltage 30%
CAL Voltage 45%
CAL Voltage 60%
CAL Voltage 80%
CAL Voltage 100%
SET Valve Position
Blower Output
Menu Item Display
CAL Voltage 21%
CAL Voltage 30%
CAL Voltage 45%
CAL Voltage 60%
CAL Voltage 80%
CAL Voltage 91%
SET Valve Position
Blower Output

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
• 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:
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288
Page 36 of 158
Operation and Maintenance Manual
Table 3-6: Combustion Cal Menu – Natural Gas
Available Choices or Limits
Minimum
.25 Vdc
.25 Vdc
.25 Vdc
.25 Vdc
.25 Vdc
.25 Vdc
0%
Monitor Blower Output Voltage
Table 3-7: Combustion Cal Menu – Propane
Available Choices or Limits
Minimum
.25 Vdc
.25 Vdc
.25 Vdc
.25 Vdc
.25 Vdc
.25 Vdc
0%
Monitor Blower Output Voltage
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.
Maximum
10.0 Vdc
10.0 Vdc
10.0 Vdc
10.0 Vdc
10.0 Vdc
10.0 Vdc
100%
Maximum
10.0 Vdc
10.0 Vdc
10.0 Vdc
10.0 Vdc
10.0 Vdc
10.0 Vdc
91%
NOTE
GF-127
OMM-0052_0E
Default
1.00 Vdc
2.30 Vdc
2.9 Vdc
3.60 Vdc
5.30 Vdc
9.10 Vdc
0%
.00
Default
1.10 Vdc
1.95 Vdc
3.00 Vdc
3.00 Vdc
4.45 Vdc
8.20 Vdc
0%
.00
PR2: 04/22/13