AERCO BMS II BOILER - Manual (Page 55)

PROGRAMMING BMS II
4-5
Selecting Remote Setpoint Mode
The Remote Setpoint Mode is selected using the Header Set Mode option in the Field Adjust Menu as
follows:
1. Using the keypad on the BMS II, press the MENU key, until FIELD ADJUST MENU appears in the
display.
2. Using the
▲ or ▼ arrow key on the keypad, scroll through the menu until HEADER SET MODE is
displayed in the first line of the VFD display. The second line of the display will show the currently
selected Header Set Mode (CONSTANT SETPOINT, OUTDOOR RESET or REMOTE SETPOINT).
3. If REMOTE SETPOINT is not displayed in the second line of the display, press the CHANGE key.
The VFD display will switch to a reverse video format indicating that a change is in process.
4. Using the
▲ or ▼ arrow key, select REMOTE SETPOINT.
5. Press the ENTER key to store the change. The reverse video display will revert to the normal display
format indicating that the change has been store in memory. With the BMS II still in the FIELD
ADJUST MENU, proceed to the next paragraph and continue the set-up procedure.
Entering Header High Limit and Low Limit Temperatures
The Header High Limit and Header Low Limit are also selected using options in the Field Adjust Menu as
follows:
1. Using the
▲ or ▼ arrow key on the keypad, scroll through the menu until HDR HIGH LIMIT is
displayed in the first line of the VFD display. The second line of the display will show the currently
selected Header High Limit temperature (default = 200°F).
2. If the required HDR HIGH LIMIT is not displayed in the second line of the display, press the CHANGE
key. The VFD display will switch to a reverse video format indicating that a change is in process.
3. Using the
▲ or ▼ arrow key, select required HDR HIGH LIMIT temperature.
4. Press the ENTER key to store the change. The reverse video display will revert to the normal display
format indicating that the change has been store in memory.
5. Next, scroll through the FIELD ADJUST MENU until HDR LOW LIMIT is displayed in the first line of
the VFD display. The second line of the display will show the currently selected Header Low Limit
temperature (default = 040°F).
6. If the required HDR LOW LIMIT is not displayed, press the CHANGE key.
7. Using the
▲ or ▼ arrow key, select required HDR LOW LIMIT temperature. Press the ENTER key to
store the change.
8. With the BMS II still in the FIELD ADJUST MENU, proceed to the next paragraph and continue the
set-up procedure.
NOTE
If the Remote Signal is set to 4 – 20 mA, the HDR HIGH LIMIT
temperature defines the 20 mA value and the HDR LOW LIMIT
temperature defines the 4 mA value.
Selecting Remote Signal Type
The boilers connected to the BMS II can be controlled by either a 4-to-20 mA signal or a Modbus signal
from an Energy Management System (EMS). The Remote Signal type is selected in the Field Adjust
Menu as follows: