Keypad; Display Module; Figure 4.2 Keypad - Carrier 69NT40-541-500 Operation And Service Manual

4.1.1

Keypad

The keypad (Figure 4.2) is mounted on the control box door. The keypad consists of 11 push button switches that
act as the user's interface with the controller. Descriptions of the switch functions are provided in
4.1.2

Display Module

The display module (Figure
1. COOL - White or Blue LED: Energized when the refrigerant compressor is energized.
2. HEAT - Orange LED: Energized to indicate heater operation in heat mode, defrost mode, or dehumidification.
3. DEFROST - Orange LED: Energized when the unit is in the defrost mode.
4. IN RANGE - Green LED: Energized when the controlled temperature probe is within specified tolerance of
set point.
The controlling probe in perishable range is the SUPPLY air probe and the controlling probe in frozen
range is the RETURN air probe.
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 TEMPERATURE display is the reading at the supply air probe.
This LED will flash if dehumidification or humidification 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 TEMPERATURE display is the reading at the return air probe.
This LED will flash if dehumidification or humidification is enabled.
7. ALARM - Red LED: Energized when an active or an inactive shutdown alarm is in the alarm queue
T-363

Figure 4.2 Keypad

CODE
SELECT
ALARM
LIST
RETURN
SUPPLY
BATTERY
POWER
4–3) consists of five digital displays and seven indicator lights. Indicator lights include:
PRE
TRIP
MANUAL
DEFROST/
INTERVAL
ENTER
C
F
ALT
MODE
NOTE
4–2
Table 4–1.