Key Pad; Figure 4.2 Key Pad - Carrier 69NT40-541-001 Operation And Service

4.1.1

Key Pad

The key pad (Figure 4.2) is mounted on the right-hand side of the control box. The key pad consists of eleven push
button switches that act as the user's interface with the controller. Descriptions of the switch functions are provided
in Table 4–1.

Figure 4.2 Key Pad

CODE
SELECT
ALARM
LIST
ENTER
RETURN
SUPPLY
BATTERY
POWER
T-316
PRE
TRIP
MANUAL
DEFROST/
INTERVAL
C
F
ALT
MODE
Table 4–1 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
Manual
pressing and holding the Defrost in-
Defrost/
terval key for five (5) seconds will ini-
tiate defrost using the same logic as
Defrost
if the optional manual defrost switch
Interval
was toggled on.
Confirms a selection or saves a se-
Enter
lection 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 Power set point and function code selection
if AC power is not connected.
This key is pressed to switch the
functions from the temperature soft
ware to the DataCORDER Software.
ALT. Mode The remaining keys function the
same as described above except the
readings or changes are made to the
DataCORDER programming.
4–2
FUNCTION