T-340
4–2
4.1.1
Keypad
The keypad (see
) is mounted on the right-hand side of the control box. The keypad consists of eleven
push button switches that act as the user’s interface with the controller. Descriptions of the switch functions are
Figure 4.2 Keypad
Table 4–1 Keypad Function
4.1.2
Display Module
The display module (see
) consists of two 5-digit displays and seven indicator lights. The indicator lights
include:
• COOL - White or Blue LED: Energized when the refrigerant compressor is energized.
• HEAT - Orange LED: Energized to indicate heater operation in heat mode, defrost mode, or dehumidification.
• DEFROST - Orange LED: Energized when the unit is in defrost mode.
• IN RANGE - Green LED: Energized when the controlled temperature probe is within the specified tolerance
of set point.
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.
