Carrier 69NT40-561-300, Operation And Service Manual

Page: 36 / 174

T-365 4–2
4.1.1 Key Pad
The key pad ( Figure 4.2 ) is mounted on the control box door. The key pad consists of eleven push button switches
that act as the user’s interface with the controller. Descriptions of the key pad switch functions are provided in
Table 4–1 .
Figure 4.2 Key Pad
CODE
SELECT
PRE
TRIP
ALARM
LIST
MANUAL
DEFROST/
INTERVAL
ENTER
BATTERY
POWER
ALT
MODE
RETURN
SUPPLY
C
F
Table 4–1 Key Pad Description
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.
Depressing and holding the Defrost
Interval key for five (5) seconds will
initiate defrost using the same logic
as if the optional manual defrost
switch was toggled on.
Enter Confirms a selection or saves a se-
lection to the controller.
Arrow Up Change or scroll a selection up-
ward. Pre-trip advance or test inter-
ruption.
Arrow Down Change or scroll a selection down-
ward. Pre-trip repeat backward.
Return / Supply Displays non-controlling probe tem-
perature (momentary display)
Celsius / Fahren-
heit Displays alternate English/Metric
scale (momentary display). When
set to F, pressure is displayed in
psig and vacuum in “/hg.” “P” ap-
pears after the value to indicate
psig and “i” appears for inches of
mercury.
When set to C, pressure readings
are in bars. “b” appears after the
value to indicate bars.
Battery Power Initiate battery backup mode to al-
low set point & function code selec-
tion if AC power is not connected.
ALT Mode This key is pressed to switch the
functions from the temperature
software to the DataCORDER Soft-
ware. The remaining keys function
the same as described above ex-
cept the readings or changes are
made to the DataCORDER pro-
gramming.