Benchmark 750-3000 Boiler Operation & Maintenance Manual
SECTION 2: OPERATION
OMM-0122_D
•
GF-206
•
5/9/2019
Technical Support
•
(800) 526-0288
•
Mon-Fri, 8 am - 5 pm EST Page 23 of 164
2.7 TUNING Menu
The
Tuning
menu items are Factory set for each individual unit. Do not change these menu
entries unless specifically requested to do so by factory-trained personnel.
A full description of each item appears in Appendix A-4.
TABLE 2-5: TUNING Menu
MENU ITEM DISPLAY
MINIMUM
MAXIMUM
DEFAULT
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
2.8 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 2-6, 2-7 and 2-8. 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 (NO
x
) and Carbon
Monoxide (CO) emissions specified in the combustion calibration instructions in Section 4.4 of
the
Benchmark 750 – 3000 Installation and Startup Guide
, OMM-0121 (GF-205).
CAL Voltage values are factory adjusted for each unit prior to shipping, and so may differ from
the defaults shown in the tables below. A full description of each item appears in Appendix A-5.
2.8.1 BMK 750/1000 COMBUSTION CAL Menu
TABLE 2-6: COMBUSTION CAL Menu: BMK 750/1000
MENU ITEM DISPLAY
MINIMUM
MAXIMUM
DEFAULT
Natural gas
Propane
1
CAL Voltage 18%
0.25
10.00
2.10
2.10
2
CAL Voltage 30%
0.25
10.00
2.55
2.55
3
CAL Voltage 45%
0.25
10.00
3.10
3.10
4
CAL Voltage 60%
0.25
10.00
3.50
3.50
5
CAL Voltage 80%
0.25
10.00
4.60
4.60
6
CAL Voltage 100%
0.25
10.00
5.60
5.60
7
SET Valve Position
0%
100%
0%
0%
8
Blower Output
Monitor Blower Output Voltage
0.00
0.00
9
Set Stdby Volt
0 V
10.0 V
2.00
2.00
10
Oxygen Level
0%
25%
0.0
0.0