AERCO BMS II BOILER - Manual (Page 53)

PROGRAMMING BMS II
4-3
Selecting Boiler Operating Mode
The Boiler Plant can be set for either Parallel or Sequential Mode operation. The Boiler Operating Mode is
selected in the Configuration Menu as follows:
1. Using the keypad on the BMS II, press the MENU key, until CONFIGURATION MENU appears in the
display.
2. On the keypad, press the
▲ arrow key once. BOILER OP MODE will be displayed in the first line of
the VFD display. The second line of the display will show the currently selected Boiler Operating
Mode. (SEQUENTIAL MODE or PARALLEL MODE). The default setting is SEQUENTIAL MODE.
3. If the desired Operating Mode 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, toggle the display to the desired setting.
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 stored in memory.
Entering Boiler Start and Boiler Stop Levels
The Boiler (BLR) Start and Boiler Stop Levels are also entered in the Configuration Menu. Refer to
Appendix I to determine the correct Start and Stop levels for your installation. Enter the appropriate
values in the Configuration Menu as follows:
1. Using the
▲ or ▼ arrow key on the keypad, scroll through the Configuration Menu until BLR START
LEVEL is displayed along with the current setting (default = 20%).
2. If the desired Boiler Start Level is not displayed, press the CHANGE key. The display will switch to to
a reverse video format.
3. Select the desired Boiler Start Level using the
▲ or ▼ arrow key.
4. Press the ENTER key to store the changed Start Level.. The reverse video display will revert to the
normal VFD display format.
5. Next, scroll through the menu until the BLR STOP LEVEL is displayed along with the current setting
(default = 16%).
6. If the desired Boiler Stop Level is not displayed, repeat steps 2, 3 and 4 above and enter the desired
Stop Level.
Entering System Start Temperature
In order to set up 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.