CHAPTER 5: MODE OF OPERATION
PR2: 04/22/13 Page
57
of
158
Benchmark 2.0LN Dual-Fuel Low NOx Boiler
Operation and Maintenance Manual
OMM-0052_0E
GF-127
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
•
Ph: 800-526-0288
NOTE
A design engineer typically provides design outdoor air temperature and
supply header temperature data.
4. Once the design outdoor air temperature is chosen, go across the chart to the desired supply
header temperature for the design temperature chosen in step 3.
5. Next, go up that column to the Reset Ratio row to find the corresponding reset ratio.
6. Access the Configuration Menu and scroll through it until the display shows
Bldg Ref
Temp
. (Building Reference Temperature).
7. Press the
CHANGE
key. The display will begin to flash.
8. Use the
▲
and
▼
arrow keys to select the desired Building Reference Temperature.
9. Press
ENTER
to save any changes.
10. Next, scroll through the Configuration Menu until the display shows
Reset Rati
o.
11. Press the
CHANGE
key. The display will begin to flash.
12. Use the
▲
and
▼
arrow keys to select the Reset Ratio determined in step 5.
13. Press
ENTER
to save the change.
Refer to paragraph 3.3 for detailed instructions on menu changing.
5.3 CONSTANT SETPOINT MODE
The Constant Setpoint mode is used when a fixed header temperature is desired. Common
uses of this mode of operation include water source heat pump loops, and indirect heat
exchangers for potable hot water systems or processes.
No external sensors are required to operate in this mode. While it is necessary to set the
desired setpoint temperature, it is not necessary to change any other temperature-related
functions. The unit is factory preset with settings that work well in most applications. Prior to
changing any temperature-related parameters, other than the setpoint, it is suggested that an
AERCO representative be contacted. For descriptions of temperature-related functions and their
factory defaults, see Appendices A and E.
Setting the Setpoint
5.3.1
The setpoint temperature of the unit is adjustable from 40°F to 240°F. To set the unit for
operation in the Constant Setpoint Mode, the following menu settings must be made in the
Configuration Menu:
MENU OPTION
SETTING
Boiler Mode
Constant Setpoint
Internal Setpt
Select desired setpoint
using
▲ and ▼ arrow
keys (40°F to 240°F)
Refer to paragraph 3.3 for detailed instructions on changing menu options.
