AERCO BMS 168 - Manual (Page 44)

5.1.4 Entering the Building Reference
Temperature
To enter the Building Reference
Temperature, perform the following steps:
1. Enter Field Adjust mode by pressing the
FIELD ADJ key. Verify that the key LED
illuminates.
2. Press the REF TEMP key. The display
will show the present BLDG REF.
TEMP.
3. Using the ▲ and ▼ arrow keys, select
the desired Building Reference
Temperature.
5.1.5 Entering the Reset Ratio
Enter the Reset Ratio as follows:
1. Ensure that the BMS is in the Field
Adjust mode.
2. Press the RESET RATIO key. The
display will show RESET RATIO
1.2°F/°F which is the default setting.
3. Using the ▲ and ▼ arrow keys, select
the desired Reset Ratio.
4. Initialize the system as described in
paragraph 5.5.
NOTE
For Remote Setpoint control utilizing
a RS485 Modbus network, refer to
Modbus Communication Manual
GF-114.
5.2 S
ETUP
F
OR
R
EMOTE
S
ETPOINT
M
ODE
In order to set up the BMS to operate in this
mode, a 4-to-20 mA communication line
from an Energy Management System with a
floating ground 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:
• Header Set Mode
• Boiler Operating Mode
• Remote Signal Type
• Header Temperature Limits.
5.2.1 Entering Header Set Mode and
Boiler Operating Mode
These selections are made with the BMS in
the System Configuration mode. Proceed as
follows:
1. Press the CONFIG SYS key to enter the
System Configuration mode. The
CONFIG SYS key LED will illuminate.
2. Place SYSTEM CONFIGURATION
OVERLAY on the BMS front panel.
3. Press the HDR SET MODE key once.
HDR SET MODE is displayed with the
present mode selection.
4. While observing the display, toggle the
HDR SET MODE to REMOTE SET
TEMP using the ▲ or ▼ arrow key.
5. Press the BLR OP MODE key. BOILER
OP MODE is displayed with the present
mode selection.
6. Select either the PARALLEL MODE or
SEQUENTIAL MODE using the ▲ or ▼
arrow key.
7. Press the CONFIG SYS key to exit the
System Configuration mode. The
CONFIG SYS LED will go off.
8. Remove the SYSTEM CONFIGUR-
ATION overlay from the BMS front
panel.
5.2.2 Entering Remote Signal Type and
Header Temperature Limits
These selections are made with the BMS in
the Field Adjust mode. Proceed as follows:
1. Enter Field Adjust mode by pressing the
FIELD ADJ key. Verify that the key LED
illuminates.
2. Press the AIR TEMP key five times until
the first line of the display reads
REMOTE SIGNAL.
3. Using the ▲ or ▼arrow key, toggle the
second line of the display to read
4-20MA.
4. Next, press and release the HDR TEMP
LIMIT key once. HDR HIGH LIMIT is
displayed with the present high
temperature limit setting.
5-2