HIdRos WDH 039, Technical Manual

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WDH
Ground source heat pumps
MTWDHGB REV.072008
38
REFRIGERANT CIRCUIT REPAIR
In the case that refrigerant circuit should be discharged, all the refrigerant must be recovered with proper machines. The
system must be charged with nitrogen, using a gas bottle with a pressure reducing valve, until 15 bar pressure is reached. Any
eventual leakage must be searched with a bubble leak finder. In case bubbles appear discharge the circuit before welding with
proper alloys.
WARNING: Never use oxygen instead of nitrogen: explosions may occur.
ENVIRONMENT PROTECTION
According to European norms dealing with the use of depleting stratospheric ozone substances, it is forbidden to release
refrigerants fluids in the atmosphere. They must be redelivered to the seller or to proper gathering points at the end of their
operating life. Refrigerant R407C is mentioned among controlled substances and for this reason it must be subjected to said norms.
A particular care is recommended during service operations in order to reduce as much as possible any refrigerant loss.
UNIT OUT OF SERVICE
Once the unit is arrived at the end of its life and needs to be removed or replaced, the following operations are recommended:
•
the unit refrigerant has to be recovered by trained people and sent to proper collecting centre;
•
compressor lubricating oil has to be recovered and sent to proper collecting centre;
•
the frame and various components, if not usable any longer, have to be dismantled and divided according to their nature;
particularly copper and aluminium, which are present in conspicuous quantity in the unit. These operations allow easy material
recover and recycling process, reducing environmental impact.
FAULT FINDING
Please refer to the unit microprocessor manual.