Benchmark 2.0 LN Installation, Operation & Maintenance Manual
CHAPTER 3 – OPERATION
Page 44 of 168 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0046_0J
06/18/2015 Phone: 800-526-0288 GF-123
3.7 TUNING MENU
The Tuning Menu items in Table 3-5 are Factory set for each individual unit. Do not change these
menu entries unless specifically requested to do so by Factory-Trained personnel.
Table 3-5: Tuning Menu
Available Choices or Limits
Prop Band 1°F 120°F 70°F
Integral Gain 0.00 2.00 1.00
Derivative Time
(if Unit Type =
Boiler
0.00 min 2.00 min 0.00 min
Warmup Prop Band Range = 1 - 120 95
Warmup Int Gain Range = 1 - 200 50
Warmup PID Timer Range = 1 - 240 20
Reset Defaults Yes, No, Are You Sure No
3.8 COMBUSTION CAL MENU
The Combustion Cal (Calibration) 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. Differences exist in the
Combustion Cal test points and default drive voltages for natural gas and propane units. Therefore,
separate listing are provided in Table 3-6 are provided The valve positions (% open) and default
drive voltages are listed in Table 3-6.
Refer to the Combustion Calibration procedures in Chapter 4 for the procedures applicable to the
type of fuel being used.
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