Carrier 69NT40-521, 69NT40-511-1 Controller Function Codes, Controller Function Code Assignments

3.1.4Controller Function Codes

There are thirty-nine functions which the operator may access to examine the operating status of the unit. To access these functions, perform the following steps: Press the CODE SELECT key, then press an arrow key until the left window displays the desired code number

(see Table 3-3). For the display only function codes, the right window will display the value of this item for five seconds before returning to the normal display mode. If a longer time is desired, pressing the ENTER key will extend the time to 30 seconds after the last pressing of the ENTER key. Function codes are explained in Table 3-3.

		Table 3-3. Controller Function Code Assignments
CODE	TITLE	DESCRIPTION
#
		Inapplicable Functions Display ----------
		Display Only Functions
		The suction modulation valve (SMV) is a normally open valve which restricts flow
		of refrigerant to the compressor when energized by a pulse width modulated
Cd01	Modulation Valve	(PWM) output. The amount of valve closure is proportional to the applied current
	Opening (%)	over the range of 0.2 to 1.3 A. The valve is completely open (right display reads
		100%) below 0.2 amps and is completely closed (right display reads 0%) at 1.3
		amps.
Cd02	Quench Valve	Shows state of the solenoid quench valve, if so equipped (open or closed).
	(Open--Closed)
	Suction Solenoid	The suction solenoid valve (SSV) provides maximum refrigerant flow to the
		refrigeration unit. This valve will always be open for set points at or below --10_C
Cd03	Valve
		(+14_F), or --5_C (+23_F) optionally, and during temperature pulldown periods
	(Open--Closed)
		unless suction solenoid override or current limiting restricts its use.
		Unit current is monitored by two current sensors. The current measured is used
	Line Current, Phase	for control and diagnostic purposes.For control processing, the highest of the
		Phase A and B current values is used for current limiting purposes. The third
Cd04	A
		unmeasured leg is calculated based on a current algorithm. For diagnostic
Cd05	Line Current, Phase	processing, the current draws are used to determine control unit operations.
Cd06	B	Whenever a heater or a motor is turned ON or OFF, the current draw
	Line Current, Phase	increase/reduction for that activity is measured. The current draw is then tested to
	C
		determine if it falls within the expected range of values for the unit. 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.
	Mains Power	The value of the main power frequency is displayed in Hertz. The frequency
Cd08		displayed will be halved if either fuse F1 or F2 is bad and alarm code AL21 is
	Frequency	active.
Cd09	Ambient	The ambient sensor (AMBS) measures the temperature outside the container.
	Temperature	For location of the sensor, see Figure 2-5.
Cd10	Compressor Suction	Compressor suction temperature is measured just prior to the compressor suction
	Temperature	service valve, and is a display-only temperature.
	(Optional)
	Compressor
Cd11	Discharge	The compressor discharge temperature is measured near the compressor
	Temperature	discharge valve and is display only.
	(Optional)
		Compressor suction pressure is displayed using a pressure transducer. Pressure
Cd12	Compressor Suction	is displayed in units of psig when code 28 is set to _F and units of bars when
	Pressure (Optional)	code 28 is set to _C. “P” appears after the value to indicate psig, “b” appears after
		the value to indicate bars and “i” appears after the value for inches of mercury.

T-268-07 3-6