3--2
T-334
3.1.1 Key Pad
The key pad (Figure 3--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 3--1.
1
2
3
4
8
9
10
11
5
7
6
1. Code Select
2. Pre-Trip
3. Alarm List
4. Manual Defrost/
Interval
5. ENTER
6. UP Arrow
7. DOWN Arrow
8. Return/Supply
9.
Celsius/Fahrenheit
10. Battery Power
11. Alt. Mode
Figure 3--2 Key Pad
3.1.2 Display Module
The display module (Figure 3--3) consists of five digit
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.
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.
Table 3--1 Key Pad Function
KEY
FUNCTION
Code Select Accesses function codes.
Pre-Trip
Displays the 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. De-
pressing and holding the Defrost in-
terval key for five (5) seconds will ini-
tiate defrost using the same logic as
if the optional manual defrost switch
was toggled on.
Enter
Confirms a selection or saves a
selection to the controller.
Arrow Up
Change or scroll a selection upward
Pre-trip advance or test interruption.
Arrow Down Change or scroll a selection down-
ward. Pre-trip repeat backward.
Return/
Supply
Displays non-controlling probe tem-
perature (momentary display).
Celsius /
Fahrenheit
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” 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 allow
set point and function code selection
if AC power is not connected.
ALT. Mode
This key is pressed to switch the
functions from the temperature soft-
ware to the DataCORDER Software.
The remaining keys function the
same as described above except the
readings or changes are made to the
DataCORDER programming.
5. Supply - Yellow LED: Energized when the supply air
probe is used for control. When this LED is illumi-
nated, the temperature displayed in the AIR TEM-
PERATURE display is the reading at the supply air
probe. This LED will flash if dehumidification or hu-
midification is enabled.
6. Return - Yellow LED: Energized when the return air
probe is used for control. When this LED is illumi-
nated, the temperature displayed in the AIR TEM-
PERATURE display is the reading at the return air
probe. This LED will flash if dehumidification or hu-
midification is enabled.
7. Alarm - Red LED: Energized when there is an active
or an inactive shutdown alarm in the alarm queue.
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