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

High ef

fi

 ciency heat recovery unit with cooling circuit - 

RHE

 -

33

Selection, installation, use and maintenance manual

GB

10. The compressor does not start due 

•  Pressure switch out of order  

• Check and replace 

to the intervention of the  

•  Machine completely empty  

• See point 11)

low pressure switch

•  Poor air flow  

• Check the air duct and the state of  

the filters.

•  Blocked refrigerant filter 

• Check and replace

•The thermal expansion valve does not  

• Check, clean or if necessary 

  function correctly 

  replace it.

11. Lack of gas 

•  Leak in the refrigerating circuit  

• Check the refrigerating circuit 

  with a leak detector 

12. Hot liquid pipe 

•  Lack of refrigerant  

• See point 11)

13. The refrigerating circuit functions 

•  Lack of refrigerant  

• See point 11)

    correctly but with insufficient   

•  Presence of humidity or incondensable 

• Replace the filter and if necessary 

    proficiency  

  in the refrigerating circuit  

  drain and refill the circuit 

14. Compressor suction tube 

• Thermal expansion valve  

• Check the valve and 

frosted

if it is not working 

  correctly replace it 

•  Poor air flow  

• Check filters, fans and ducts.

•  Lack of refrigerant  

• See point 11)

•  Blocked liquid filter  

• Clean or replace 

15. Abnormal noise in the system 

•  Vibrations in the pipes  

• Secure the pipes

•  Noisy compressor  

• Check electrical phases connection 

•  Noisy thermostatic valve  

• Check and add refrigerant 

16. Evaporator coil 

•  Lack of refrigerant in the circuit:  

• Check for leaks and eliminate them  

  before bubbles visible in the indicator. 

  roofping up with refrigerant.

•  Thermostatic expansion valve over . 

• Reduce the overheating of the 

  closed: suction pipe too hot   

  thermostatic expansion valve    

 turn the valve stem and 

  check the suction pressure . 

•  Thermostatic expansion valve over . 

• Change the valve or free the  

closed: expansion valve bulb   

   control pipe.

  partially blocked or pressure intake pipe  

  blocked 

•  Filter-drier blocked: bubbles in the   

• Change the filter-drier.

  flow indicator and liquid pipe colder 

  at the filter drier outlet  

•  The manifold feed pipes are  

• Remove the obstruction; clean or change 

  blocked or oil has accumulated in the  

  the evaporator.

  coil: not all of the evaporator circuits 

  are working  

17. Compressor too hot 

•Thermostatic expansion valve  

• Reduce the overheating of the 

over closed: excessive overheating  

  thermostatic valve 

  of the evaporator discharge gas 

18. Compressor to cold and noisy 

•  Expansion valve over open:  

• Measure and reset the overheating 

  the system works with the overheating  

  by closing the valve 

  to low  (return of liquid to the 

  compressor). 

•  Thermostatic valve out of order: the stem or   • Replace the valve or free the 

  the seat of the expansion valve is  

  pressure inlet pipe 

  corroded. Pressure inlet pipe blocked.

• Foreign objects between the stem and the seat   • Clean the stem and the holes of the 

  of the thermostatic valve: abnormal function     thermostatic valve 

  of the thermostatic valve