PROGRAMMING BMS II
4-1
CHAPTER 4 - PROGRAMMING BMS II OPERATING MODES
4.1 INTRODUCTION
Prior to programming, the BMS-II must be mounted and all required wiring completed. In addition, all
connections should be checked for accuracy. Once these items are completed, the BMS-II is ready to be
programmed for the desired mode of operation for the boiler plant. The steps for programming will vary
somewhat, depending on whether the Outdoor Reset, Remote Setpoint or Constant Setpoint operating
mode is selected.
NOTE
The Level 1 Password (159) must be entered prior to
programming the BMS II for operation in any of the modes
described in paragraphs 4.2 through 4.4. Refer to Chapter 3 for
instructions on password entry and basic menu processing
procedures.
4.2 OUTDOOR RESET MODE
The Outdoor Reset mode operates based on outside air temperature. In this mode, the header supply
water temperature will vary up or down in accordance with outside air temperature. Therefore, in order to
set up and operate in this mode, an outdoor air sensor MUST be installed. This mode requires entries to
be made in the Field Adjust Menu and Relay Menu for the following options:
•
FIELD
ADJUST
MENU
o
HEADER SET MODE
o
RESET RATIO
o
BLDG REF TEMP
•
CONFIGURATION
MENU
o
BOILER OPERATING MODE
•
RELAY
MENU
o
SYSTEM START RELAY TEMP
The programming set-up instructions for the above menu options are provided in paragraphs which
follow.
Selecting Outdoor Reset Mode
The Outdoor Reset 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
OUTDOOR RESET
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.
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