D-EIMHP01501-22_00EN
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1.
the current absorbed by the compressor must be compared to the rated value. Normally the value of the absorbed current
is lower than the rated value that corresponds to the absorption of the full load compressor at the maximum operating
conditions.
2.
at least once every three months all the security checks must be made to verify their functionality. Each appliance, with
aging, can change its point of operation and this must be monitored to adjust it or replace it. The pump interlocks and flow
switches must be checked to make sure that they interrupt the control circuit if they intervene.
Table 7 lists all Maintenance activities for standard applications and standard environment.
Table 8 lists all Maintenance activities for critical applications or highly aggressive environment.
Table 7-Standard Routine Maintenance Plan
Notes:
1.
Monthly activities include all the weekly ones.
2.
The annual (or early season) activities include all weekly and monthly activities.
3.
Daily reading of the operating values of the unit allows maintaining high observational standards.
4.
Check for any dissolved metals.
5.
Clean condenser banks with clean water and water heat exchangers with appropriate chemicals. Particles and fibres could
clog up the exchangers, especially for water exchangers pay attention if water rich in calcium carbonate is used. An increase
in pressure drops or a decrease in thermal efficiency means that the heat exchangers are clogged. In environments with a high
concentration of airborne particles, it might be necessary to clean the condenser bank more often.
6.
Units placed or stored in a Highly Aggressive Environment for long time without operation are still subject to those routine
maintenance steps.
Monthly Yearly/Seasonal
List of Activities
Weekly
(Note 1)
(Note 2)
General:
Reading of operating data (Note 3)
X
Visual inspection of unit for any damage and/or loosening
X
Verification of thermal insulation integrity
X
Cleaning
X
Paint where necessary
X
Analysis of water (4)
X
Check of flow switch operation
X
Electrical Installation:
Verification of start-up sequence
X
Verify contactor wear
– Replace if necessary
X
Verify that all electrical terminals are tight
– Tighten if necessary
X
(Quarterly)
Clean inside the electrical panel
X
Visual inspection of components for any signs of overheating
X
Verify operation of compressor and electrical resistance
X
Refrigeration circuit:
Check for any refrigerant leakage (leak test)
X
Analyse compressor vibrations
X
Hydraulic circuit:
Check for any water leakage
X
Check hydraulic connections
X
Check the pressure at the exchangers water inlet
X
Clean the water filter
X
Check the glycol concentration
X
Check the water flow rate
X
BPHE:
Check the cleaning of the
BPHE
X
