Controller Operation - Hussmann RFLNS Installation & Operation Manual

Commands
REFRIGERATION / ELECTRICAL / CONTROLLER
2-12

CONTROLLER OPERATION

Follow the tables to use the commands. The keypad
display is located on the front of the merchandiser.
Switches the device ON and OFF, if
onF = oFF
Figure 4-1 - XR75CX Front Panel Switches the light ON and OFF, if oA1 = Lig
Locks/Unlocks the keyboard
4.1. Keys and Functions
To enter programming mode
Table 4-1 shows the keys that are found on the
Returns to room temperature display
front panel of the XR75CX controller and their corre-
sponding functions:
Switches the device ON and OFF, if
Table 4-1 - XR75CX Front Panel Keys and Functions
onF = oFF
Key
Switches the light ON and OFF, if oA1 = Lig
Press to display target setpoint, to select a pa-
4.2. Use of LEDS
rameter in programming mode, or to confirm
an operation
Locks/Unlocks the keyboard
Each LED function is described in Table 4-2:
Starts a manual defrost
To enter programming mode
LED Mode
Press the UP arrow to see the MAX tempera-
ture, to browse the parameter codes in pro-
ON Compressor enabled
Returns to room temperature display
gramming mode, or to increase the currently
displayed temperature value.
Flashing Anti-short cycle delay enabled
Press the DOWN arrow to see the MIN tem-
Table 4-1 - XR75CX Front Panel Keys and Functions
perature, to browse the parameter codes in
ON Defrost enabled
programming mode, or to decrease the cur-
rently displayed temperature value.
4.2. Use of LEDS Flashing Drip time in progress
Table 4-1 - XR75CX Front Panel Keys and Functions
Follow the LED commands to operate and control the
ON Fans enabled
case's lighting.
Each LED function is described in Table 4-2:
Flashing Fans delay after defrost in progress.
LED Mode
ON An alarm is occurring
ON Compressor enabled
ON Continuous cycle is running
Flashing Anti-short cycle delay enabled
ON Energy saving enabled
ON Defrost enabled
ON Light ON
Flashing Drip time in progress
ON30 Auxiliary relay ON
ON Fans enabled
4 • XR75CX I&O Manual
ON Measurement unit
Flashing Fans delay after defrost in progress.
Flashing Programming phase
ON An alarm is occurring
Table 4-2 - LEDs
ON Continuous cycle is running
ON Energy saving enabled
ON Light ON
ON30 Auxiliary relay ON
P/N 0539221_T
ON Measurement unit
Flashing Programming phase
Function
Function
Function
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026-1210 Rev 0 09-FEB-2011
Switches the light ON and OFF, if oA1 = Lig
Locks/Unlocks the keyboard
To enter programming mode
Returns to room temperature display
How to see the setpoint:
1. Push and immediately release the SET key. The display
Table 4-1 - XR75CX Front Panel Keys and Functions
will show the setpoint value.
2. Push and immediately release the SET key or wait for 5
4.2. Use of LEDS
seconds to display the present value again.
Each LED function is described in Table 4-2:
How to change the setpoint:
LED The controller is shipped from the factory with Frozen Food Mode
ON Compressor enabled
settings. To modify the temperature for Ice Cream application,
follow these instructions:
Flashing Anti-short cycle delay enabled
1. Push and hold the SET key for more than 2 seconds to
ON Defrost enabled
change the setpoint value.
Flashing Drip time in progress
2. The value of the setpoint will be displayed and the °C or
°F LED starts blinking.
ON Fans enabled
3. To change the setpoint value push the UP or DOWN
Flashing Fans delay after defrost in progress.
arrows within 10 seconds.
4. To memorize the new setpoint value, push the SET key
ON An alarm is occurring
again or wait 10 seconds.
ON Continuous cycle is running
How to start a manual defrost:
ON Energy saving enabled
Push and hold the DEF key for more than 2 seconds and a
ON Light ON
manual defrost will start.
ON30 Auxiliary relay ON
How to lock the keyboard:
ON Measurement unit
1. Keep the UP + DOWN arrow keys pressed for more than
3 seconds.
Flashing Programming phase
2. The PoF message will be displayed and the keyboard
will be locked. At this point it will be possible to see the
Table 4-2 - LEDs
setpoint of the MAX or Min temperature stored only.
3 If a key is pressed for more than 3 seconds the PoF message
will be displayed.
How to unlock the keyboard:
Press the UP and DOWN arrow keys together for more than 3
seconds until the Pon message displays.
026-1210 Rev 0 09-FEB-2011
Alarms:
P1 Discharge temperature probe failure
P2 Defrost termination probe failure
HA Max temperature alarm
LA Min temperature alarm
How to set defrost start time
The defrost will occur 24 hours after the controller is first
powered up, then every 24 hours after that.
Function