AM, EM, AQ, BA, ASW - IOM
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9 Maintenance
9.1 Introduction
The following text describes regular maintenance operations of heat pumps.
9.2 Personnel Qualification
The heat pumps are refrigeration equipment and for this reason the maintenance described in
italics can be performed by a specialist, service technician of cooling and air-conditioning
equipment with approved qualification according to the local regulations.
All work on inner components of the unit can be performed when it is turned off, the main switch
in position “0”.
The Investor can choose any servicing organization approved by Master Therm company.
9.3 Quarterly Maintenance
This maintenance does not require special skills, is performed by the user.
•
mechanical check
remove contingent dirt on the unit using wet cloth
visual inspection of external condition of the inner unit, piping, cables
visual inspection of the condition of the outer unit and its surrounding (vegetation)
•
inspection of hydraulic circuit
inspection of overpressure and sufficient filling of hydraulic circuits
inspection and cleaning of filter sieves
inspection of anti-freeze mixtures (if used as the filling)
inspection of venting
9.4 Annual Maintenance
•
inspection of refrigeration circuit during operation, temperatures and operating
pressures:
condensation pressure
evaporating pressure
expansion valve setting
compressors suction temperature
compressors discharge temperature
temperature of liquid coolant
incoming temperature of liquid circuits
outgoing temperature of liquid circuits
inspection of control system settings
inspection of protection settings of the cooling circuit
inspection of operating current of all components on each phase
inspect tightness of service valves and tightness of other components
•
inspection of electric connection
disconnect the unit from power supply and tighten the connectors and remove
dust from all components, especially: terminal boards, contactors, circuit breakers,
overcurrent relays, and electric motors
inspection of operation and setting of circuit breakers
•
inspection of hydraulic circuit
inspect correct flow of heat exchangers
inspect tightness of liquid circuit components