Owner manual

CHAPTER 3: CONTROL PANEL OPERATION
PR2: 05/09/12 Page 37 of 152
Benchmark 1.5LN Low NOx Boiler
Operation and Maintenance Manual
OMM-0041_0D
GF-120
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288
Table 3-4: Configuration Menu (Continued)
Aux Start On Dly 0 sec. 120 sec. 0 sec.
Failsafe Mode Shutdown or Constant Setpt Shutdown
*Analog Output
(See CAUTION at end of Table
3-4 )
Off, Setpoint, Outlet Temp,
Valve Position 4-20 mA,
Valve Position 0-10V
*Valve Position
0-10V
Low Fire Timer 2 sec. 600 sec. 2 sec.
Setpt Limiting Enabled or Disabled Disabled
Setpt Limit Band 0°F 10°F 5°F
Network Timeout 5 Sec 999 Sec 30 Sec
HI DB Setpt EN 0% 100% 30%
Demand Offsert 0 25 10
Deadband High 0 25 2
Deadband Low 0 25 2
*CAUTION
DO NOT CHANGE the Analog Output Menu Item from its
Default setting (Valve Position 0-10V).
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.
3.8 COMBUSTION CAL MENU
The Combustion Cal (Calibration) Menu items in Table 3-6 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. The valve positions (%) and default drive voltages are listed in Table 3-6.
Table 3-5: Tuning Menu
Available Choices or Limits
Menu Item Display
Minimum
Maximum
Default
Prop Band 1°F 120°F 70°F
Integral Gain 0.00 2.00 1.00
Derivative Time 0.0 min 2.00 min 0.00 min
Reset Defaults? Yes, No, Are You Sure? No