2-16
62--611XX--20 (03/04)
The Carrier Transicold microprocessor controller in-
corporates the following features :
a. Controls supply or return air temperatureto tight lim-
its by providingrefrigeration control, heat anddefrost
to ensure conditioned air delivery to the load.
b. Dual independent readouts of set point and supply or
return air temperatures.
c. Digital readout and ability to select data. Refer to
Table 2-5 for Function Codes and Table 2-7 for Unit
Data.
d. For alarm digital display identification Refer to
Table 2-8.
e. A self-test check on program memory and data
memory. Theself-test is executed each timethe sys-
tem is switched from “Stop” to “Start.” Errors, if any,
shall be indicated on the display as a ERR.X, where
X is a number corresponding to the number of the
test. The unit shall display this error for 5 seconds
and then reset the micro.
ERROR
CAUSE
ERR.1
ERR.2
ERR.3
Processor failure
Check chip installation or replace
microprocessor
ERR.4
Display board to logic board
communication failure.
This can be caused by a defec-
tive ribbon cable or ribbon cable
not plugged in properly.
2.8.2
Keypad
Thekeypad has 12 keys which will allow theoperator
to initiate various functions, display operating data and
change operating parameters.
1.
Display window : shows set--point, box temperature,
operating mode, alarm displays, as well as data on the
unit itself (battery voltage, water temperature etc.).
Function Change key
The
function change key
is used to
display the operating parameters. Each
time this key is pressed the display will
advance to the next parameter. Thiskey,
in conjunction with the
up/down arrow
and
enter keys
, will allow the user to
change the parameters.
Arrows key
The UP ARROW and DOWN ARROW
keys are used to alter the set--point.
Press theup or down arrowkeys untilthe
desired setpoint is displayed on the
left--hand side of the display window.
When the correct set--point is displayed,
press the ENTER key to confirm the
setting.
The UP ARROW and DOWN ARROW
keys are also used to change the unit
functions and scroll through the
FUNCTION and UNIT DATA screens.
Enter key
The ENTER key confirms changes
made to unit operation. It must be
pressed to change the setpoint after
using the arrow keys to adjust it. If the
ENTER key is not pressed, the setpoint
will revert to the previously entered
setting.
The ENTER key must also be pressed
whenever a FUNCTION setting is being
altered. If this key is not pressed, the
function will revert to its previous setting.
RUN/STOP switch
The main unit RUN/STOP switch
controls the unit operation. When
switched to the Run (I) position, the unit
will start in the operating mode last
entered (Road or Standby). The
set--point will be at the last set--point
entered on the keypad.
Road key
The ROAD key puts the unit into Road
(or engine) operation when the unit has
been previously operated in the Standby
mode.
City Speed key
The CITY SPEED key toggles the unit
between high speed and low speed
(diesel mode). When City Speed is
selected, the unit will run only in low
speed except during defrost cycles. This
feature is useful in areas where noise is
restricted.