![background image](http://html1.mh-extra.com/html/watts/aerco-benchmark-750/aerco-benchmark-750_user-manual_4058382045.webp)
Benchmark 750 – 1000 Boiler User Manual - INTERNATIONAL
CHAPTER 3 – OPERATION
OMM-0119_0A
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
Page
45
of
170
GF-130-I
Ph.: 800-526-0288
11/03
/2016
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
Menu Item Display
Available Choices or Limits
Default
Minimum
Maximum
1
Prop Band
1°F (0.55
°
C)
120°F (66
°
C)
70°F (38.5
°
C)
2
Integral Gain
0.00
2.00
1.00
3
Derivative Time
0.0 min
2.00 min
0.0min
4
Warmup Prop Band
1°F 0.55
°
C)
120°F (66
°
C)
95 °F (52
°
C)
5
Warmup Int Gain
0.00
2.00
0.50
6
Warmup PID timer
0 sec.
240 sec.
20 sec.
7
Reset Defaults?
Yes, No, Are You Sure?
No
3.8 COMBUSTION CAL MENU
The
Combustion Cal
(Calibration) menu is protected by the level 2 password (
6817
) which must
be entered to view or change the menu items shown in Table 3-6. These 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 then 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 where the default drive
voltages are set are listed in Table 3-6.
Table 3-6: Combustion Cal Menu
Menu Item Display
Acceptable Range
Default
Minimum Maximum
1
CAL Voltage 16%
0.25
10.00
1.00
2
CAL Voltage 30%
2.30
3
CAL Voltage 45%
2.50
4
CAL Voltage 60%
2.90
5
CAL Voltage 80%
3.80
6
CAL Voltage 100%
7.90
7
SET Valve Position
0
100
variable
8
Blower Output
Displays current value
9
Set Stdby Volt
0
10.0
2.00
10 Oxygen Level
Displays current value
11 Spark Monitor
Enable or Disable
Disable
12 Min Spark Amps
0
2.5
0.1
13 Max Spark Amps
0
2.5
0.4