Fault Rectification; Refrigeration Unit Is Not Running; Thermal Detector Defective; Log. Detector Not Working Correctly - Viessmann EVO-COOL Series Installation And Operating Instructions Manual

11. Fault rectification

Attention: Before working on electrical components and on the unit the equipment must always be disconnected from mains!
Risk through electrical power and rotating (fan) and hot parts (pipes, condenser, heat exchanger)!
Problem
Refrigeration unit is not
running.
Refrigeration unit is run-
ning, but the display is not
working.

Thermal detector defective.

• RF–breakage / short
circuit
• Liquefaction detector not
working correctly
• Log. detector not working
correctly
Fault with the package
detector.

High pressure.

General notice (liability): the details of this technical documents serve for description. Consents regarding the availability of certain features or regar-
ding a certain purpose always require a special written agreement.
Page 63 GB
Description / Reason Correction
Power plug is not Connect the power plug and check the mains fuse. If you cannot determine a
connected. defect, contact an expert company. The supply voltage and frequency must
always match the values specifi ed on the type plate.
Mains voltage not Check whether the voltage specifi ed on the type plate is applied.
applied Check whether the fuse protection is also ensured according to the ratings on
the type plate.
Ensure voltage supply.
Evaporator fan Check wire connections of bus lines. The display connection must always
starts up briefl y, but remain plugged in to the upper socket!
the display is not In the bus operation, the connection between the power boards is not speci-
working. fi ed.
Mains voltage not Check whether the voltage specifi ed on the type plate is applied.
applied Check whether the fuse protection is also ensured according to the ratings on
the type plate.
Ensure voltage supply.
The fuse on the PCB Check wiring of door contact switch. The n-conductor always switches! Short
(base board) always circuit occurs when mixed up! Unplug door contact connection (X2) and try
trips. again. If the fault is still present, unplug devices (connectors X3A to X3H) and
try again. Work on electrical systems must only be conducted by qualifi ed
electricians.
Refrigeration unit is Briefl y press the rotary knob. If still no display, check wire connections of the
running, but the dis- bus lines. The display connection must always be plugged into the upper
play is not working. socket of the power board! (see Electrical circuit diagram, Page 66 to 69)
After the "Time Lighting" process (main menu "Settings", sub-menu "Control
Panel"), the display will go to sleep.
One or more detec- Up to 4 thermal detectors PT1000are built into the EVO-COOL®. The display
tors are defective. will show which detector is defective (e.g. Log. detector not working correctly).
To change a detector, please contact your refrigeration specialist.
If the machine is not longer running, you may turn on the emergency opera-
tion with the DIL switch on the main board. The machine will then continue
running without temperature regulation and defrosting.
The refrigeration specialist company must be contacted immediately for
maintenance!
If the condenser, evaporator and/or condenser fan are not running and the
solenoid valve for the fl uid line has been actuated, a damage on the PCB is pre-
sent which prevents the selection. The emergency run is then also no longer
ensured.
The package detec- If the message 'Package detector fault' appears, a check must be conducted
tor is defect. to see if the evaporator is covered in ice. Before replacing the detector, first
remove the ice and check the detector's position. The detector must not touch
the evaporator's tubes. If the detector touches the tubes, the defrost period
is too short and the ice does not melt as the defrost temperature is reached
prematurely.
Fault within the The safety pressure switch (pressostat) has been activated. If the fault does
refrigeration cycle not disappear following acknowledgement, please contact your refrigeration
regarding high specialist. The safety circuit can contain not only the high pressure switch but
pressure. also other components. (See the circuit diagram on pages 66 to 69).
Unit runs continuously and the evaporator ices over.
Right reserved to make technical changes!
GB