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

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4–3 T-365
4.1.2 Display Module
The display module ( Figure 4.3 ) consists of two five 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 specified tolerance of
set point.
NOTICE
The controlling probe in perishable range will be the SUPPLY air probe and the controlling probe
in frozen range will be the RETURN air probe.
• ALARM - Red LED: Energized when there is an active or an inactive shutdown alarm in the alarm queue.
• 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 is enabled.
• 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 is enabled.
Figure 4.3 Display Module
4.1.3 Controller
CAUTION
!
Do not remove wire harnesses from controller modules unless you are grounded to the unit
frame with a static safe wrist strap.
CAUTION
!
Unplug all controller module wire harness connectors before performing arc welding on any
part of the container.
CAUTION
!
Do not attempt to use an ML2i PC card in an ML3 equipped unit. The PC cards are physically
different and will result in damage to the controller.
NOTICE
Do not attempt to service the controller modules. Breaking the seal will void the warranty.
COOL HEAT DEFROST IN RANGE ALARM SUPPLY RETURN
SETPOINT/Code AIR TEMPERATURE/Data