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rainfall in at an open doorway or wet pedestrian foot traffic, so careful consideration must
be paid to the design of the floor and its surface finish.
If it is intended that the air curtain should not operate in cooling mode and a condensate
drain system is not fitted, the BMS System, Centralised Controller or PAR-31 MAA / PAR-
U02MEDA Remote Controller must be configured at commissioning so that COOL or
AUTO mode can never be selected (see Section – Commissioning, Page 23). It is still
recommended, however, that the floor design and surface be as described above, in case
cooling mode is used in the future and also to cope with heavy rainfall or wet pedestrian
foot traffic.
Note: It could still be possible for an end user to unlock a PAR-31 MAA / PAR-U02MEDA
remote controller if they found out how to and switch it into cooling, not realising that
condensate would then flood out of the drain tray. It may be considered prudent, therefore,
to install a condensate drain system even if it is intended that the unit should only be used
in HEAT or FAN mode.
Note: When the LEV on a Multi-Split VRF system is closed it will not shut off refrigerant
flow completely, there will always be some flow of refrigerant through the DX coil in the air
curtain. This can be a problem with Multi-Split VRF systems in the summer in high
humidity hot climates such as Mediterranean or Southern European regions where other
indoor units are in cooling mode on the same VRF system. Even though the air curtain is
not being used for cooling the DX coil will still get cold because of the small flow of cooling
refrigerant and water condensate will be produced. This is why a drip tray is fitted in the air
curtain for unintentional condensate formation. In regions where there is high humidity and
heat in the summer it will be necessary to fit a condensate drain system to the drip tray as
the tray could fill-up and flood. An alternative is to have a manual shut-off valve fitted into
the refrigerant pipework to the air curtain.
The air curtain is designed only for use with a Mitsubishi Electric City Multi (VRF) system
for use on R410A. The complete Thermoscreens air curtain / Mitsubishi Electric heat pump
system, including fridge pipework, wiring, controls, etc. must be installed only by an
approved Mitsubishi Electric refrigeration contractor.
Persons using the air curtain must be given adequate instruction and supervision
concerning the use of the appliance by a person responsible for their safety. The air
curtain is not intended for use by persons (including children) with reduced physical,
sensory or mental capabilities.
These instructions must be read in conjunction with the separate Mitsubishi Electric
instructions that come with other components of the heat pump system, e.g. Compressor
Unit, BC Controller, PAR-31 MAA / PAR-U02MEDA Remote Controller, BMS System,
Centralised Controller, etc. All instructions should be kept by the building facilities manager
for future reference.
T9901075-2-3 UK
Page 7 of 38
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