AERCO BMS II BOILER - Manual (Page 57)

PROGRAMMING BMS II
4-7
Entering Load Start Percent (Required Only for Modulex Installations)
If the boiler plant contains Modulex boilers, the LOAD START PCT option in the Calibration Menu must
be entered. This option should be set 2% below the BLR START LEVEL set in the Configuration Menu.
Proceed as follows:
1. Press the MENU key until CONFIGURATION MENU appears in the display.
2. Scroll through the menu using the
▲ or ▼ arrow key until LOAD START PCT appears in the display
along with the current setting for this option (default = 1%).
3. Refer to Appendix I to determine the appropriate BLR START LEVEL for the Modulex Boiler.
4. Press the CHANGE key to change the displayed value. The display will switch to a reverse video
format.
5. Using the
▲ and ▼ arrow keys, set the LOAD START PCT to 2% below the BLR START LEVEL.
6. Press the ENTER key to store the changed percentage. The reverse video display will revert to the
normal VFD display format.
7. The BMS II is now fully programmed for operation in the Outdoor Reset Mode with Modulex Boilers.
4.4 CONSTANT SETPOINT MODE
In the Constant Setpoint Mode of operation, only a header sensor is required. Entries in this mode are
required for the following items:
• FIELD ADJUST MENU
o HEADER SET MODE
o INTERNAL SETPOINT
• CONFIGURATION MENU
o BOILER OPERATING MODE
o BLR START LEVEL
o BLR STOP LEVEL
• CALIBRATION MENU (Required Only for Modulex Installations)
o LOAD START PCT
The set-up instructions for the above menu options are provided in paragraphs which follow.
Selecting Constant Setpoint Mode
The Constant 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 CONSTANT 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 CONSTANT 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 next paragraph to select the Internal Setpoint Temperature.