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18
T-305
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.
ENTER
BATTERY
POWER
MANUAL
DEFROST/
INTERVAL
CODE
SELECT
PRE
TRIP
ALARM
LIST
ALT.
MODE
RETURN
SUPPLY
_
C
_
F
Figure 9. Key Pad
COOL
HEAT DEFROST IN RANGE ALARM SUPPLY RETURN
SETPOINT/Code
AIR TEMPERATURE/Data
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 toindicate 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 specifiedtolerance
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
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
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 inter-
val key for five (5) seconds will initiate
defrost using the same logic as if the
optional manual defrost switch was
toggled on.
The Manual Defrost function can also
be selected by simultaneously press-
ing and holding the Pre--Trip and Alt.
Mode buttons.
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).
_
C/
_
F
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-
pears for inches of mercury.
When set to
_
C. pressure readings
are in bars. “b” appears after the val-
ue 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.
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.
Содержание 69NT40-489-100 Series
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Страница 172: ...148 T 305 Figure 93 Electrical Wiring Diagram Sheet 1 of 2 Units not modified to include the N2 Purity Solenoid Valve...
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