AERCO BMS 168 - Manual (Page 30)

NOTE
Sample Normal Mode displays with
their Factory Default values are
provided in Appendix C.
4.2 N
ORMAL
M
ODE
D
ISPLAYS
A
ND
F
UNCTIONS
When power is applied to the BMS, it is
automatically placed in the Normal Mode. It
allows you to view the settings currently
stored in memory for BMS parameters. In
addition, you can enter the Field Adjust or
System Configuration Mode by pressing the
FIELD ADJ or CONFIG SYS key. The
functions provided by the keypad keys are
described in the following paragraphs.
4.2.1 HDR TEMP
Pressing and releasing this key displays the
actual header sensor water temperature in
°F. Pressing and holding this key displays
the header setpoint temperature presently
stored in memory.
4.2.2 AIR TEMP
Pressing and releasing this key displays the
actual outside air temperature. Pressing and
holding this key displays the actual inside
air temperature, only if an indoor air
temperature sensor is installed. If an indoor
air sensor is not installed, INDOOR AIR
TEMP NOT CONNECTED will be displayed.
4.2.3 % LOAD
Pressing and releasing this key displays the
actual firing rate percentage (% Load) for
the boiler plant. It also displays the number
of boilers presently operating.
4.2.4 SYS START TEMP
Pressing and holding this key displays the
System Start Relay temperature setting in
°F presently stored in memory. The system
will start whenever the outside air
temperatures drops below this setting.
4.2.5 REF TEMP
Pressing and holding this key displays the
Header Reference Temperature in °F
presently stored in memory.
4.2.6 HDR TEMP LIMIT
Pressing and holding this key displays the
header high limit temperature setting (°F)
stored in memory.
4.2.7 FIELD ADJ
Pressing and releasing this key places the
BMS in the Field Adjust Mode and lights the
FIELD ADJ key LED. When this key is
pressed, the display will read FLD
ADJUSTMENT MAKE SELECTION. Refer
to paragraph 4.3 for key functions when in
this mode.
4.2.8 SET POINT
Pressing and holding this key displays the
indoor setpoint temperature (°F) stored in
memory.
4.2.9 PROP BAND
Pressing this key displays the indoor air
proportional bandwidth. This bandwidth is a
variable used in an equation that solves for
the proper offset of supply water
temperature based on an indoor air
temperature. Normally the display will read
INDOOR PROP BAND 00.0°F/°F. See
paragraph 4.3.9 for additional information.
4.2.10 OFFSET
Pressing and holding this key displays the
Header Temperature Offset (°F) for the
present time and day-of-the-week. See
paragraph 4.3.10 for additional information
on setting up an offset schedule.
4.2.11 RESET RATIO
Pressing and holding this key will display
the header reset ratio if a value is currently
stored in memory. This function is only used
in the Indoor/Outdoor Reset Mode. If this
function is not set, or the Constant Setpoint
or Remote (4-20 mA) mode is used, the
display will show FUNCTION NOT VALID.
Also, ALARM CANCEL is printed directly
above this key. Pressing and releasing this
key will open the Alarm Relay contacts until
the Alarm condition reappears.
4-4