Rev. F 01-2022
38
MTEC.5811.GB-F-1 Operation and maintenance manual HHA series English
HHA
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Site assembled refrigerant circuits must be assembled and maintained carefully, in order to prevent malfunctions.
Therefore:
•
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• In the event of a gas leakage on machines using refrigerant R134A, R410A even if it is only a partial leak, do not top up. The entire charge
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• When replacing any part of the refrigerant circuit, do not leave it exposed for more than 15 minutes.
•
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caps.
• When replacing the compressor following a burn out, it is advisable to wash the cooling system with appropriate products including a
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• When under vacuum do not switch on the compressor.
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For leak detection, the system should be charged with nitrogen using a gas bottle with a pressure reducing valve, until 15 bar pressure is
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the proper alloys.
If the refrigerant circuit is to be emptied, all the refrigerant must be recovered using the correct equipment.
Never use oxygen instead of nitrogen: explosions may occur.
Daily and monthly works may be carried out directly by the Owner of the system. All other works must be perfor-
med by authorised and trained personnel.
Any kind of cleaning whatsoever is forbidden before disconnecting the device from power supply by turning the
master switch to the OFF position. It is forbidden to touch the device while barefooted or with wet or damp body
parts.
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regulations in force.
7.4.3 Compressors
Action to be performed
Frequency
Monthly
Every
2 months
Every
6 months
Every
year
Every
5 years
As neces-
sary
Visually inspect compressors
X
Check noise and vibration level of the compressors
X
Check the supply voltage of the compressors
X
Check the compressors’ electrical connections
X
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X
Check that the crankcase heaters are powered and working properly (if present)
X
Check the conditions of the compressors’ power cables and their tightness in
the clamps
X
Before the start-up it is necessary to carry out all the operations described in the previous tables and make the
necessary checks provided by the pre-start control module (valid for the italian market) to be requested to the
service.
