Operating manual ef cooling Ernst H. Furrer AG
Cooling unit EVO 45, 0390.013 Issue: 07 / 2015 Chapter-Page 7-23
7 Operation
The refrigeration system is set up for automatic operation. No interventions by the operating
company or user are intended.
External switch on/off commands are issued via potential-free contacts (see electrical diagram).
The setpoint can be set on the display.
7.1.1 Personnel qualification
This cooling unit must only be operated by personnel who fulfil the following requirements:
• Have read and understood Chap. 2 Safety
• Have undergone introduction as an operator of the system
7.1.2 Description of the PLC
The cooling unit is ready for operation and can be placed in service directly or via the remote
control. The PLC regulates the temperature of the cooling medium, and controls and monitors
and the cooling unit. The cooling unit is fully automatic.
For information on operating the PLC, see Chap. 13.7 PLC manual
7.1.3 Troubleshooting at operator level
N.B. The messages shown on the display may differ from those in this table or may not appear
as stated, depending on the unit and application.
Warning: The cooling unit continues running. Alarm: The cooling unit shuts down.
The fault for the latest event is displayed. The arrow keys can be used to display other pending
fault messages. To ensure rapid and effective resolution, please tell Support about all of the
pending messages.
From the main menu, press the Alarm key once: The latest pending message is displayed
The messages can be acknowledge by pressing the Alarm key twice. Faults which are still
pending will be shown again, either immediately or after a delay.
Return to the main menu with the ESC key.
Warning Possible causes Remedy
MEDIUM CIRCUIT
OVERTEMPERATURE
– Insufficient cooling capacity
- Other causes
– Control signal cooling should show 100%
– There should be no bubbles in the sight
glass of the refrigerant circuit
– Check if any other alarm messages are
pending
– Request Customer Service
WATER LEVEL INSUFFICIENT
– Insufficient water level
– Leakage
– Check the pipes for leaks
– Request Customer Service
Warning 130
WATER FILTER FOULED
– Water filter fouled
– Hoseline kinked
– Clean/replace water filter
– Straighten kink in hoselines
AIR FILTER FOULED
– Condenser fouled
– Air supply or removal obstructed
– Air inlet temperature > 45°C
– Intake air and waste air "short
– Clean/replace air filter
– Clean condenser
– Remove obstructions
– Thoroughly ventilate the area with
additional fans
– Change the set-up location
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