Fast RHE Series, Selection, Use, Installation And Maintenance Manual

High ef

fi

 ciency heat recovery unit with cooling circuit - 

RHE

 -

32

Selection, installation, use and maintenance manual

GB

Diagnosis and fault solving  

1. Insufficient air flow rate 

• Fans rotation speed  

• Clean the components 

  too low 

  increase the fan speed 

• Pressure drop of the  

  distribution system   underestimated 

• Blocked filters

• Blocked intake grating 

• Coil incrustation 

2. Excessive air flow rate 

• Fans rotation speed  

• reduce the fan speed 

  too high 

• Pressure drop of the 

  distribution system  overestimated 

• Filters not fitted  

• Fit filters

3. No air flow rate 

• Power supply off  

• Make sure power supply is available 

• Electric motor burnt out  

• Replace the electric motor 

4. Abnormal noise 

•  Excessive flow rate  

• Reduce flow rate 

• Bearings worn or defective  

• Replace bearings

• Foreign objects on the fan blades  

• Clean blades

5. Water movement 

•  Trap Blocked  

• Clean trap

•  No trap or incorrectly carried out 

• Use an adequate trap 

6. The compressor does not start 

•  Defective connection or contacts open  

• Check the voltage and close the contact 

•  Thermostat does not 

• System at temperature, no 

  respond 

   request; check the setting and the  

  functioning 

• Safety device does not  

• See point 9) and 10)

  respond

•  Defective compressor  

• Replace compressor 

7. The compressor does not start 

•  Compressor burnt out or seized 

• Replace compressor 

• 

Compressor remote control switch de-energised

• Check the voltage across

  the operating time of the protection; 

  automatic compressor shutdown 

•  Power circuit open  

• Check why the protection cut in 

  compressor; automatic shutdown 

8. The compressor starts and then sroofs 

• Defective compressor remote control switch   • Check and if necessary replace it 

•  Defective compressor  

• Check and if necessary replace it 

9. The compressor does not start due to 

•Pressure switch out or order  

• Check and replace 

the intervention of the high pressure  

• Excessive refrigerant  

• Discharge excess gas 

switch

•  Presence of incondensable gas  

• Refill the circuit after having 

  in the refrigerating circuit   

discharged and placed in vacuum.

• The condensate coil is not sufficiently  

• (See point 1)

   covered in air 

•  Blocked refrigerant filter 

• Check and replace