Carrier 69NT40-561-019, Operation And Service Manual

Page: 51 / 136

4–25 T-359
Table 4–5 Controller Function Codes
CODE # TITLE DESCRIPTION
NOTE
If the function is not applicable, the display will read “-----”
Display Only Functions
Cd01
Digital Unloader
Valve Closed (%)
Displays the DUV percent closed. The right display reads 100% when the valve is ful-
ly closed. The valve will usually be at 10% on start up of the unit except in very high
ambient temperatures.
Cd03
Compressor Motor
Current
The current sensor measures current draw in lines L1 & L2 by all of the high voltage
components. It also measures current draw in compressor motor leg T3. The com-
pressor leg T3 current is displayed.
Cd04
Cd05
Cd06
Line Current,
Phase A
Line Current,
Phase B
Line Current,
Phase C
The current sensor measures current on two legs. The third unmeasured leg is cal-
culated based on a current algorithm. The current measured is used for control and
diagnostic purposes. For control processing, the highest of the Phase A and B current
values is used for current limiting purposes. For diagnostic processing, the current
draws are used to monitor component energization. Whenever a heater or a motor is
turned ON or OFF, the current draw increase/reduction for that activity is measured.
The current draw is then tested to determine if it falls within the expected range of val-
ues for the component. Failure of this test will result in a pre-trip failure or a control
alarm indication.
Cd07
Main Power
Voltage
The main supply voltage is displayed.
Cd08
Main Power
Frequency
The value of the main power frequency is displayed in Hertz. The frequency displayed
will be halved if either fuse F1 or F2 is bad (alarm code AL21).
Cd09
Ambient
Temperature
The ambient sensor reading is displayed.
Cd10
Evaporator
Temperature
Sensor
Evaporator temperature sensor reading is shown on the right display.
Cd11
Compressor
Discharge
Temperature
Compressor discharge temperature sensor reading, using compressor dome tem-
perature, is displayed.
Cd12
Compressor
Suction Pressure
Reading for evaporator pressure transducer (EPT) is shown on the left display; Press
ENTER at Cd12 to show reading for compressor suction port pressure on right dis-
play.
Cd14
Compressor
Discharge
Pressure
Compressor discharges pressure transducer reading is displayed.
Cd15
Digital Unloader
Valve
The status of the valve is displayed (Open - Closed).
Cd16
Compressor Motor
Hour Meter/Unit
Run Time Hour
Meter
This code displays the compressor motor hours. User can view unit run time by press-
ing the ENTER key while in Cd16. Total hours are recorded in increments of 10 hours
(i.e., 3000 hours is displayed as 300).
The Compressor Motor Hour Meter display can be reset to 0 by pressing and holding
the ENTER key for 5 seconds. The Unit Run Time Hour Meter cannot be reset.
Cd17
Relative
Humidity%
Humidity sensor reading is displayed. This code displays the relative humidity, as a
percent value.
Cd18
Software Revision
#
The software revision number is displayed.