Main Base Board (Mbb); Current Sensor Board (Csb); Energy Management Module (Emm) - Carrier GEMINI 38APS025-065 Installation Instructions Manual

Adjusting the Contrast The contrast of the display can be
adjusted to suit ambient conditions. To adjust the contrast of
the Navigator module, press the
play reads, Select a menu item. Using the arrow keys move
to the Configuration mode. Press
this mode. The display will read:
> TEST OFF
METR OFF
LANG ENGLISH
Pressing will cause the OFF to flash. Use the up
ENTER
or down arrow to change OFF to ON . Pressing
will illuminate all LEDs and display all pixels in the view
screen. Pressing
ENTER
allows the user to adjust the display contrast. Use the up or
down arrows to adjust the contrast. The screen s contrast will
change with the adjustment. Press
change. The Navigator module will keep this setting as long as
it is plugged in to the LEN bus.
Adjusting the Backlight Brightness
display can be adjusted to suit ambient conditions. The factory
default is set to the highest level. To adjust the backlight of the
Navigator module, press the
reads, Select a menu item. Using the arrow keys move to the
Configuration mode. Press
mode. The display will read:
> TEST OFF
METR OFF
LANG ENGLISH
Pressing will cause the OFF to flash. Use the up
ENTER
or down arrow keys to change OFF to ON . Pressing
will illuminate all LEDs and display all pixels in the
ENTER
RUN SERVICE
MODE
STATUS TEST
Manual
Auto
Mode
Display
On/Off
(VIEW)
(TEST)
Machine Unit
Hours/Starts Outputs
(RUN) (OUTS)
Compressor Ckt A Comp
Run Hours Tests
(HOUR) (CMPA)
Compressor Ckt B Comp
Starts Tests
(STRT) (CMPB)
Preventive
Maintenance
SUB-MODE
(PM)
Software
Version
(VERS)
LEGEND
Ckt — Circuit
*Throughout this text, the location of items in the menu structure will be described in
the following format:

Item Expansion ( Mode Name Sub-mode Name
ESCAPE key until the dis-
ENTER to obtain access to
ENTER
and ESCAPE simultaneously
to accept the
ENTER
The backlight of the
ESCAPE key until the display
to obtain access to this
ENTER
Table 2 — Scrolling Marquee Display Menu Structure*
TEMPERATURES PRESSURES
Unit Ckt A
Temperatures Pressures
(UNIT) (PRC.A)
Ckt A Ckt B
Temperatures Pressures
(CIR.A) (PRC.B)
Ckt B
Temperatures
(CIR.B)

ITEM )
view screen. Pressing the up and down arrow keys simultane-
ously allows the user to adjust the display brightness. Use the
up or down arrow keys to adjust screen brightness. Press
to accept the change. The Navigator module will
ENTER
keep this setting as long as it is plugged in to the LEN bus.
Main Base Board (MBB) —
the heart of the ComfortLink control system. It contains the
major portion of operating software and controls the operation
of the machine. The MBB continuously monitors input/output
channel information received from its inputs and from all other
modules. The MBB receives inputs from the discharge and
suction pressure transducers, current sensor boards (CSB) and
thermistors. See Table 3. The MBB also receives the discrete
inputs from the thermostat contacts and other status switches.
See Table 4. The MBB also controls several outputs. Informa-
tion is transmitted between modules via a 3-wire communica-
tion bus or LEN (Local Equipment Network). The CCN (Car-
rier Comfort Network
both LEN and CCN buses are made at the LVT (low voltage
terminal) terminal strip.
Current Sensor Board (CSB) —
monitor the status of the compressors by measuring current and
providing an analog input to the main base board (MBB) or
compressor expansion module (CXB).
Energy Management Module (EMM) —
module is available as a factory-installed option or as a field-
installed accessory. The EMM module receives 4 to 20 mA
inputs for the percent capacity, temperature reset, cooling set
point, and demand limit functions. The EMM module also re-
ceives the switch inputs for the field-installed 2-stage demand
limit and when two thermostats are used for one unit. The
EMM module communicates the status of all inputs with the
MBB, and the MBB adjusts the control point, capacity limit,
and other functions according to the inputs received.
SET
INPUTS OUTPUTS CONFIGURATION
POINTS
Unit Unit
Cooling
Discrete Discrete
(COOL)
(GEN.I) (GEN.O)
Head
Ckt A/B Ckt A Unit Configuration
Pressure
(CRCT) (CIR.A)
(HEAD)
Unit
Ckt B
Analog
(CIR.B)
(4-20)
Set Point Select
18
See Fig. 20. The MBB is
® ) bus is also supported. Connections to
The CSB is used to
TIME OPERATING
CLOCK MODES
Display Unit Time Modes
(DISP) (TIME) (MODE)
Unit Date Task State
(UNIT) (DATE) (TSKS)
Daylight
CCN Network Saving
(CCN) Time
(DST)
Local
Options 1 Holiday
(OPT1) Schedules
(HOL.L)
Schedule
Options 2
Number
(OPT2)
(SCH.N)
Local
Motormaster Schedule
(M.MST) Number
(SCH.L)
Reset Cool Schedule
Temperature Overide
(RSET) (OVR)
(SLCT)
Service
Configuration
(SERV)
Broadcast
Configuration
(BCST)
The EMM
ALARMS
Current
(CRNT)
Reset
Alarms
(RCRN)
Alarm
History
(HIST)