Carrier 69NT40-561-019, Operation And Service Manual

Page: 28 / 136

T-359 4–2
4.1.1 Keypad
Figure 4.2 Keypad Table 4–1 Keypad Function
4.1.2 Display Module
The display module ( Figure 4.3 ) consists of two 5-digit displays and seven indicator lights. The indicator lights
include:
1. Cool - White or Blue LED: Energized when the refrigerant compressor is energized.
2. Heat - Orange LED: Energized to indicate heater operation in the heat or defrost mode.
3. Defrost - Orange LED: Energized when the unit is in the defrost mode.
4. In-Range - Green LED: Energized when the controlled temperature probe is within specified tolerance of
set point.
NOTE
The controlling probe in the perishable range will be the SUPPLY air probe and the controlling probe in
the frozen range will be the RETURN air probe.
CODE
SELECT
PRE
TRIP
ALARM
LIST
MANUAL
DEFROST/
INTERVAL
ENTER
BATTERY
POWER
ALT
MODE
RETURN
SUPPLY
C
F
KEY FUNCTION
CODE
SELECT
Accesses function codes.
PRE TRIP
Displays Pre-trip selection menu.
Discontinues Pre-trip in progress.
ALARM LIST Displays alarm list and clears the
alarm queue.
MANUAL
DEFROST /
INTERVAL
Displays selected defrost mode.
Depress and hold the MANUAL DE-
FROST / INTERVAL key for five (5)
seconds to initiate defrost using the
same logic as if the optional manual
defrost switch was toggled on.
ENTER
Confirms a selection or saves a selec-
tion to the controller.
Arrow Up
Change or scroll a selection up. Pre-
trip advance or test interrupt.
Arrow Down
Change or scroll selection downward.
Pre-trip repeat backward.
RETURN /
SUPPLY
Display non-controlling probe tem-
perature (momentary display).
Celsius /
Fahrenheit
Display alternate English/Metric scale
(momentary display). When set to F,
pressure is displayed in psig and vac-
uum in “/hg.” “P” appears after the val-
ue to indicate psig and “i” appears for
inches of mercury. When set to C,
pressure readings are in bars. “b” ap-
pears after the value to indicate bars.
BATTERY
POWER
Initiate battery backup mode to allow
set point & function code selection if
AC power is not connected.
ALT MODE
This key is pressed to switch the func-
tions from temperature software to
the DataCORDER software. The re-
maining keys function the same as
described above except the readings
or changes are made to the Data-
CORDER programming.