R410A Mini Split Chiller 50Hz
MCAC-UTSM-2014-01
60
19. Maintenance
19.1 Shut down for long periods
If it is previewed not to use the machine for long periods, after deactivating the chiller:
● Make sure the remote switch SA1 is in the "OFF" position, or alternatively disconnect the unit from the
power supply.
● Make sure the remote keyboard (if present) is set to “OFF”.
● Position QF and QS on OFF
● Deactivate the indoor terminal units by placing the switch of each unit in the “OFF” position.
● Close the water valves.
Note:
If there is a possibility that the outside temperature may drop below zero, there is the risk of freezing. The
water circuit must be emptied and shut off power(when draining after heat pump operation take care as the
water may be hot) or antifreeze must be added in the proportion recommended by the manufacture.
19.2 Routine maintenance
Never perform any cleaning operations before having disconnected the unit from the mains power supply. If
the supply cord is damaged, it must be replaced by the manufacturer or its service agent or a similarly
qualified person in order to avoid a hazard.
Regular maintenance is fundamental to maintain the efficiency of the unit both in terms of operation and
energy consumption. The Technical Assistance Service maintenance plan must be observed, with an
annual service which includes the following operations and checks:
● Filling of the water circuit.
● Presence of air bubbles in the water circuit.
● Efficiency of safety devices.
● Power supply voltage.
● Power input.
● Tightness of electrical and hydraulic connections.
● Condition of the compressor contactor.
● Efficiency of the plate heat exchanger heater.
● Checking of operating pressure, superheating and subcooling.
● Efficiency of compressor heater.
● Cleaning of finned coil (*).
● Cleaning of fan grills.
● Cleaning of condensate drain pan (if installed).
(*) for “Heat pump” appliances, the checks are to be performed quarterly.
● For units installed near the sea, the intervals between maintenance should be halved.
19.3 Extraordinary maintenance
Never perform any cleaning operations before having disconnected the unit from the mains power supply.
19.3.1
Chemical washing
You are recommended to chemically wash the plate heat exchanger after every 3 years of operation.
19.3.2
Refrigerant gas content
The chillers are filled R410A refrigerant gas and tested in the factory. In normal conditions, there should be
no need for the Technical Assistance Service to intervene to check the refrigerant gas. However, over time,
small leaks may develop at the joints leading to loss of refrigerant and draining of the circuit, causing the unit
to function poorly. In this case, the leaks of refrigerant circuit refilled. Proceed as follows:
