Design Information - Thermoscreens Air curtain system Installation, Operation & Maintenance Instructions Manual

AS SUPPLIED the air curtain operates on a 1 phase electrical supply (1L+N+E) from a local
switched spur which provides power for fans and controls. There is an integral defrost
cycle auxiliary heater located inside the air curtain but this is 'disabled' as supplied. If the
defrost cycle auxiliary heater is required the air curtain will then need a 3 phase electrical
supply (3L+N+E) from a local switched spur, instead of the 1 phase electrical supply, to
provide power for the heater as well which will need to be 'enabled' on site during
commissioning, see also notes on Page 6 and Section 'Installation - Electrical Supply and
Wiring to the Air Curtain', Page 16.
Electrical power to the Mitsubishi Electric Compressor Unit(s) and BC Controller is fed
separately in the normal way (see separate Mitsubishi Electric Instructions).
There is a Mitsubishi Electric M-Net communications link between the Mitsubishi Electric
Compressor Unit or BC Controller and the Thermoscreens Heat Pump Air Curtain. When
used with a Mitsubishi PAR-30MAA or PAR-27MEA Remote Controller this link provides:-
 On/Off control of the Mitsubishi Electric heat pump system
 Mode change between heating, fan only and cooling of the Mitsubishi Electric heat
pump system
 Capacity control of the Mitsubishi Electric heat pump system
 3-speed control of the Thermoscreens air curtain fans*
 Temperature monitoring of the inlet air entering the air curtain, or the room air
temperature at the remote controller
 Signal for when the outdoor unit is in defrost mode so a defrost cycle auxiliary heater
(if enabled) can provide partial heat back-up during the few minutes of defrost.
 Error signal for if the Mitsubishi Electric system has a problem
* As an alternative a door switch can be used to switch between a higher fan speed with
the door open or a lower fan speed with the door closed.
The air curtain can be set to operate in HEAT, FAN or COOL mode within the Mitsubishi
Electric City Multi VRF system using a Mitsubishi PAR-30MAA or PAR-27MEA Remote
Controller or a Mitsubishi Electric BMS or Centralised Controller.
Refer to a Mitsubishi Electric agent if the air curtain is to be controlled via a Building
Management System (BMS) or Centralised Controller.
It should be noted that during heating mode, if the compressor unit goes into its defrost
cycle during cold weather, the air curtain fans will continue to operate to maintain the all-
important air stream across the doorway. It is this air stream, particularly towards the top of
the doorway, which is so effective at stopping buoyant warm air from inside the building
escaping to outside and wasting energy and also in reducing airborne contamination.
For Y-Series systems the temperature of the discharge air can be low during the defrost
cycle period that may occur every few hours under particular outdoor weather conditions
but this has rarely become an issue with the end user and is really only a perceived
problem. There is a defrost cycle auxiliary heater fitted in the air curtain which is disabled
when the air curtain is delivered. If there are concerns for a particular Y-Series installation
this defrost cycle auxiliary heater can be enabled during site commissioning and this will
maintain the discharge air at a higher temperature during the defrost cycle. A 3-phase
electrical supply is then required to power the air curtain.
T9901078-1 UK

DESIGN INFORMATION

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