Carrier 69NT40-541-505, Operation And Service Manual, Page: 51 / 143

4–21 T-368
4.10 CONTROLLER FUNCTION CODES
Table 4–5 Controller Function Codes
Code
No.
TITLE DESCRIPTION
Note: If the function is not applicable, the display will read “----- ”
Display Only Functions − Cd01 through Cd26 are display only functions.
Cd01
Suction Modulation
Valve (SMV) Opening
(%) Displays the SMV percent open. The right display reads 100% when the valve is
fully open and 0% when the valve is fully closed. The valve will usually be at 21%
on start up of the unit except in very high ambient temperatures.
Cd02 Quench Valve State Displays the state of the solenoid quench valve, open or closed.
Cd03
Suction Solenoid
Valve State
Displays the state of the suction solenoid valve, open or closed.
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/re-
duction for that activity is measured. The current draw is then tested to determine
if it falls within the expected range of values for the component.
Failure of this test will result in a pretrip 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 dis
played will be halved if either fuse F1 or F2 is bad (see alarm code AL21).
Cd09
Ambient Air
Temperature
The Ambient Temperature Sensor reading is displayed.
Cd10
Compressor Suction
Temperature
The Compressor Suction Temperature Sensor reading is displayed.
Cd11
Compressor
Discharge
Temperature
The Compressor Discharge Temperature Sensor reading is displayed.
Cd12
Compressor Suction
Port Pressure
The Compressor Suction Pressure Transducer reading is displayed.
Cd13
Condenser Pressure
Control (CPC)
Sensor
The Condenser Pressure Control Sensor reading is displayed.
Cd14
Compressor
Discharge Pressure
The Compressor Discharge Pressure Transducer reading is displayed.
Cd15
Unloader Valve (On-
Off)
Not used in this application
Cd16
Compressor Motor
Hour Meter / Switch
On Time Records total hours of compressor run time. Total hours are recorded in incre-
ments of 10 hours (i.e., 3000 hours is displayed as 300).
/ Press 'Enter' to display Start Switch 'ON' time.
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.
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