Servicing And Maintenance; User Guide - McQuay MDS030A Design & Installation Manual

Design & installation Guide For McQuay MDS Multi System
C H A P T E R
6
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Servicing and Maintenance

6.1 User Guide

6.1.1 Responsibilities and obligations
This product is covered under MacQuay 's warranty during the warranty period.
Only MacQuay's technicians or experienced professionals designated by MacQuay are allowed
to install, test, repair and maintain this product series.
6.1.2 Unpacking inspection
Upon receipt of the units, please check them against the packing list. Check carefully if the units are
damaged during the transportation, and if all the components are complete and in good condition. In
case of any damaged unit or missing parts, please inform MacQuay's local branch or dealer in writing
immediately.
6.1.3 Using the units
°ˆ The total installed capacity of indoor units can be greater than but not more than 130% of the
capacity of outdoor units. However, when the total capacity of indoor units in operation must not
exceed that of the outdoor units. Otherwise, the output of each indoor unit can reach their rated
value;
°ˆ All the indoor units are powered in a centralized manner. Before servicing and maintenance, be
sure to turn off the main power between the units;
°ˆ After receiving the stop signal, each indoor unit will have its fan and electronic expansion valve
running for another 20~60 seconds, to make use of the afterheat or the cool air that remains in
the heat exchanger and also to get ready for the next start. This is normal.
°ˆ When the running mode of the indoor unit is in conflict with the running mode of the outdoor unit,
the hand controller will display a message indicating this indoor unit stops running because of
the operation conflict. In this case, you can switch the indoor unit to a running mode not
conflicting with the outdoor unit, to restore the system to normal. The cooling mode does not
conflict with the dehumidifying mode, while the air supply mode does not agree with any other
mode.
°ˆ The digital compressor adjusts the volume of refrigerant by opening and closing the PWM
solenoid. While the solenoid is operating, it clicks periodically. This is normal.