AERCO BMK 1.5 LN October 2012 - Manual (Page 62)

CHAPTER 5
MODE OF OPERATION
Page 62 of 166 AERCO International Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288 PR1:10/18/12
Benchmark 1.5LN Low NOx Boiler
Installation, Operation and Maintenance Manual
GF-120
OMM-0041 0E
Go down the left column of the chart to the coldest design outdoor air temperature 3.
expected in your area.
NOTE
A design engineer typically provides design outdoor air temperature and
supply header temperature data.
Once the design outdoor air temperature is chosen, go across the chart to the desired 4.
supply header temperature for the design temperature chosen in step 3.
Next, go up that column to the Reset Ratio row to find the corresponding reset ratio. 5.
Access the Configuration Menu and scroll through it until the display shows Bldg Ref 6.
Temp. (Building Reference Temperature).
Press the CHANGE key. The display will begin to flash. 7.
Use the
▲ and ▼ arrow keys to select the desired Building Reference Temperature.
8.
Press ENTER to save any changes. 9.
Next, scroll through the Configuration Menu until the display shows Reset Ratio. 10.
Press the CHANGE key. The display will begin to flash. 11.
Use the
▲ and ▼ arrow keys to select the Reset Ratio determined in step 5.
12.
Press ENTER to save the change. 13.
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.
5.3.1 Setting the Setpoint
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.