PROGRAMMING BMS II
Entering System Start Temperature
In order to complete the required set-up procedures for the Outdoor Reset Mode, the System Start
Temperature must be entered. The System Start Temperature is the outside air temperature at which the
boiler plant begins to operate. The factory default value for the System Start Temperature (
SYS START
TEMP
) is 70°F. However, temperatures from 32°F to 120°F can be selected using the
▲
and
▼
arrow
keys on the BMS II keypad. Proceed as follows:
1. Press
the
MENU
key until
RELAY MENU
appears in the display.
2. Press
the
▲
arrow key once.
SYS START TEMP
will be displayed along with the current setting for
the System Start Temperature.
3. Press
the
CHANGE
key to change the displayed temperature. The display will switch to a reverse
video format.
4. Select the desired System Start temperature using the
▲
or
▼
arrow key.
5. Press
the
ENTER
key to store the changed temperature. The reverse video display will revert to the
normal VFD display format.
6. The BMS II is now programmed for operation in the Outdoor Reset Mode.
4.3 REMOTE SETPOINT MODE
In order to set up the BMS II to operate in this mode, a Modbus communication line or a 4-to-20 mA input
line with a floating ground from an Energy Management System (EMS) is required. In addition, a BMS
header sensor is required. This mode may be used with or without an outdoor air temperature sensor
installed. Entries in this mode are required for the following items:
•
FIELD
ADJUST
MENU
o
HEADER SET MODE
o
HEADER HIGH LIMIT
o
HEADER LOW LIMIT
o
REMOTE SIGNAL
•
CONFIGURATION
MENU
o
BOILER OPERATING MODE
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.
4-3
Summary of Contents for BOILER MANAGEMENT SYSTEM II 5R5-384
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Page 73: ...APPENDIX E E 1 APPENDIX E _____________________________ BMS II WIRING DIAGRAM ...
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