Key Pad; Display Module; Figure 9. Key Pad; Figure 10. Display Module - Carrier 69NT40-489-100 Series Operation And Service Manual

3.1.1 Key Pad

The key pad (Figure 9) is mounted on the right-hand side
of the control box. The key pad consists of eleven push
button switches. Refer to Table 2 for switch function
descriptions.
CODE
SELECT
ALARM
LIST
ENTER
RETURN
SUPPLY
BATTERY
POWER

Figure 9. Key Pad

COOL HEAT DEFROST IN RANGE ALARM
SETPOINT/Code

Figure 10. Display Module

3.1.2 Display Module

The display module (Figure 10) consists of two
backlighted five digit LCD displays and seven indicator
lights. The indicator lights include:
1. Cool -- White LED: Energized when the refrigerant
compressor is energized.
2. Heat -- Orange LED: Energized to indicate heater op-
eration 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 con-
trolled temperature probe is within specified tolerance
of set point.
5. Supply -- Yellow LED: Energized when the supply air
probe is used for control. When this LED is illuminated,
the temperature displayed in the AIR TEMPERATURE
display is the reading at the supply air probe. This LED
T-305
PRE
TRIP
MANUAL
DEFROST/
INTERVAL
_C
_F
ALT.
MODE
SUPPLY RETURN
AIR TEMPERATURE/Data
will flash if dehumidification or humidification is en-
abled.
6. Return -- Yellow LED: Energized when the return air
probe is used for control. When this LED is illuminated,
the temperature displayed in the AIR TEMPERATURE
display is the reading at the return air probe. This LED
will flash if dehumidification or humidification is en-
abled.
7. Alarm -- Red LED: Energized when there is an active
or an inactive shutdown alarm in the alarm queue.

Table 2. Key Pad Function

KEY
Code Select Accesses function codes.
Displays the pre-trip selection menu.
Pre-Trip
Discontinues pre-trip in progress.
Displays alarm list and clears the
Alarm List
alarm queue .
Displays selected defrost mode. De-
pressing and holding the Defrost inter-
val key for five (5) seconds will initiate
defrost using the same logic as if the
Manual
optional manual defrost switch was
Defrost/
toggled on.
Interval
The Manual Defrost function can also
be selected by simultaneously press-
ing and holding the Pre--Trip and Alt.
Mode buttons.
Confirms a selection or saves a
Enter
selection to the controller
Change or scroll a selection upward
Arrow Up
Pre-trip advance or test interruption.
Change or scroll a selection down-
Arrow Down
ward. Pre-trip repeat backward
Return/ Displays non-controlling probe tem-
Supply perature (momentary display).
Displays alternate English/Metric
scale (momentary display). When set
to _F, pressure is displayed in psig
and vacuum in "/hg. "P" appears after
the value to indicate psig and "i" ap-
_C/_F
pears for inches of mercury.
When set to _C. pressure readings
are in bars. "b" appears after the val-
ue to indicate bars.
Initiate battery backup mode to allow
Battery
set point and function code selection
Power
if AC power is not connected.
This key is pressed to switch the
functions from the temperature soft-
ware to the DataCORDER Software.
The remaining keys function the
ALT. Mode
same as described above except the
readings or changes are made to the
DataCORDER programming.
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.
18
FUNCTION
NOTE