Airedale TurboChill FreeCool 200kW - 1830kW - Manual (Page 119)

119 Chiller Technical Manual 7525355 V1.1.0_04_2013
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Chillers TurboChill™ Air Cooled and FreeCool
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Liquid Level Sensor
The liquid level sensor is designed to measure the amount of refrigerant inside the flooded evaporator of a Turbochill
and send a current signal between 4 and 20mA to the microprocessor.
This signal is used by the controller to control the flow of refrigerant into the evaporator for optimal and energy efficient
performance. The liquid level sensor will be calibrated and located on the evaporator upon dispatch of the unit. However
in the following section there is a quick guide on how to reset and recalibrate the sensor.
Ok key
•
Move to the menu overview
• Confirm selected menu
• Edit parameter
• Save Values
 key to select
• Menu Change
• List entry
• Select editing position
+ key
•
Change value of the parameter
ESC key
•
Interrupt input
• Jump to the next higher menu
Setup instructions / guide The liquid level sensor is used to monitor the level of refrigerant inside the evaporator by sending a 4 to
20mA signal to the controller. The transmitter then governs the amount of refrigerant in the evaporator.
Step 1 Apply power
To set-up the sensor, power needs to be applied. This can be done by turning on the breaker within the control
panel. After power is applied the level sensor does an internal check for 30 seconds. This check includes the
internal electronics, the sensor type etc. The output signal jumps briefly to the fault condition (10 seconds.)
Step 2
Minimum adjustment
Through the menu structure “Basic adjustment”, select the “min adjustment”. Set to 0.00% (58.00 pF)
Step 3
Maximum adjustment
Set the maximum adjustment Set to 100.00% (101.00 pF)
Step 4
Damping
Set the damping to “0”. This suppresses any fluctuation in the display level.
Further information Further information is available from Airedale upon request.
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