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18
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 key until the dis-
play reads, “Select a menu item.” Using the arrow keys move
to the Configuration mode. Press to obtain access to
this mode. The display will read:
> TEST OFF
METR OFF
LANG ENGLISH
Pressing will cause the “OFF” to flash. Use the up
or down arrow to change “OFF” to “ON”. Pressing
will illuminate all LEDs and display all pixels in the view
screen. Pressing and simultaneously
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 to accept the
change. The Navigator module will keep this setting as long as
it is plugged in to the LEN bus.
Adjusting the Backlight Brightness
— The backlight of the
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 key until the display
reads, “Select a menu item.” Using the arrow keys move to the
Configuration mode. Press to obtain access to this
mode. The display will read:
> TEST OFF
METR OFF
LANG ENGLISH
Pressing will cause the “OFF” to flash. Use the up
or down arrow keys to change “OFF” to “ON”. Pressing
will illuminate all LEDs and display all pixels in the
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
keep this setting as long as it is plugged in to the LEN bus.
Main Base Board (MBB) — See Fig. 20. The MBB is
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
®
) bus is also supported. Connections to
both LEN and CCN buses are made at the LVT (low voltage
terminal) terminal strip.
Current Sensor Board (CSB) — The CSB is used to
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) — The 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.
Table 2 — Scrolling Marquee Display Menu Structure*
LEGEND
*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 ITEM)
ESCAPE
ENTER
ENTER
ENTER
ENTER
ESCAPE
ENTER
ESCAPE
ENTER
ENTER
ENTER
ENTER
MODE
RUN
STATUS
SERVICE
TEST
TEMPERATURES PRESSURES
SET
POINTS
INPUTS OUTPUTS CONFIGURATION
TIME
CLOCK
OPERATING
MODES
ALARMS
SUB-MODE
Auto
Display
(VIEW)
Manual
Mode
On/Off
(TEST)
Unit
Temperatures
(UNIT)
Ckt A
Pressures
(PRC.A)
Cooling
(COOL)
Unit
Discrete
(GEN.I)
Unit
Discrete
(GEN.O)
Display
(DISP)
Unit Time
(TIME)
Modes
(MODE)
Current
(CRNT)
Machine
Hours/Starts
(RUN)
Unit
Outputs
(OUTS)
Ckt A
Temperatures
(CIR.A)
Ckt B
Pressures
(PRC.B)
Head
Pressure
(HEAD)
Ckt A/B
(CRCT)
Ckt A
(CIR.A)
Unit Configuration
(UNIT)
Unit Date
(DATE)
Task State
(TSKS)
Reset
Alarms
(RCRN)
Compressor
Run Hours
(HOUR)
Ckt A Comp
Tests
(CMPA)
Ckt B
Temperatures
(CIR.B)
Unit
Analog
(4-20)
Ckt B
(CIR.B)
CCN Network
(CCN)
Daylight
Saving
Time
(DST)
Alarm
History
(HIST)
Compressor
Starts
(STRT)
Ckt B Comp
Tests
(CMPB)
Options 1
(OPT1)
Local
Holiday
Schedules
(HOL.L)
Preventive
Maintenance
(PM)
Options 2
(OPT2)
Schedule
Number
(SCH.N)
Software
Version
(VERS)
Motormaster
(M.MST)
Local
Schedule
Number
(SCH.L)
Reset Cool
Temperature
(RSET)
Schedule
Overide
(OVR)
Set Point Select
(SLCT)
Service
Configuration
(SERV)
Broadcast
Configuration
(BCST)
Ckt — Circuit