Aerco Benchmark 2.0 LN User Manual

Benchmark 2.0 LN Installation, Operation & Maintenance Manual
CHAPTER 4 – INITIAL START-UP
Page 58 of 168 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0046_0J
06/18/2015 Phone: 800-526-0288 GF-123
48. If the oxygen level is not within the specified range, adjust the level using the ▲ and ▼
arrow keys. This will adjust the output voltage to the blower motor as indicated on the
display. Pressing the ▲ arrow key increases the oxygen level and pressing the ▼ arrow
key decreases the oxygen level.
49. Once the oxygen level is within the specified range at 30%, press the ENTER key to store
the selected blower output voltage for the 30% valve position.
50. Press the ▲ arrow key until SET Valve Position appears on the C-MORE display.
51. Press the CHANGE key. SET Valve Position will begin to flash.
52. Press the ▼ arrow key until the SET Valve Position reads 16%, then press the ENTER key.
53. Press the ▼ arrow key until CAL Voltage 18% is displayed.
54. Press the CHANGE key. CAL Voltage 18% will begin to flash.
55. The oxygen level at the 18% valve position should be as shown below. Also, ensure that
the carbon monoxide (CO) and nitrogen oxide (NOx) readings do not exceed the values
shown.
Table 4-6: Combustion Oxygen Levels for a
18% Air/Fuel Valve Position
Oxygen %
± 0.2
Carbon Monoxide NOx
8.0 %
<50 ppm
<30 ppm
56. If the oxygen level is not within the specified range, adjust the level using the ▲ and ▼
arrow keys. This will adjust the output voltage to the blower motor as indicated on the
display. Pressing the ▲ arrow key increases the oxygen level and pressing the ▼ arrow
key decreases the oxygen level.
57. Once the oxygen level is within the specified range at 16%, press the ENTER key to store
the selected blower output voltage for the 16% valve position.
58. This completes the Natural Gas Combustion Calibration procedure.
IMPORTANT
The unit is shipped from the factory set up for either Natural Gas
or Propane as specified by the Style No. on the Sales Order.
4.4 UNIT REASSEMBLY
Once the combustion calibration adjustments are properly set, the unit can be reassembled for
service operation.
1. Set the ON/OFF switch in the OFF position.
2. Disconnect AC power from the unit.
3. Shut off the gas supply to the unit.
4. Remove the manometer and barbed fittings and reinstall the NPT plug using a suitable pipe
thread compound.
5. Remove the combustion analyzer probe from the vent hole. Replace the NPT plug in the
vent hole using a suitable pipe joint compound.
6. Replace the unit’s side panels and front door.

Aerco Benchmark 2.0 LN Specifications

General

Brand	Aerco
Model	Benchmark 2.0 LN
Category	Boiler
Language	English