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be located inside the right hand end of the air curtain or in a remote location outside of the
unit if required. It must be of sufficient capacity, see Table 2, self priming and capable of
providing the appropriate suction head so the pump will lift condensate out of the air
curtain, particularly if it is in a remote location. There are two hole penetrations at the right
hand end of the air curtain for condensate pipework to pass through, see Figure 2.
Suitable condensate pumps are Peristaltic or Rotary Diaphragm type. We recommend the
Blue Diamond rotary diaphragm type with cooling signal sensor (drainStik) manufactured
by Charles Austen Pumps Ltd. (www.miniblue.co.uk).
If using a condensate pump it is recommended that it has the facility so it only operates
when the air curtain is in cooling mode by detection of water in the drain tray or by
detecting a cooling differential in the airflow. It should also have a pump overrun feature to
empty the drain tray as much as possible when the air curtain is switched off. It should
have an alarm system with appropriate sensor fitted in the drain tray that will give a volt-
free signal (closed circuit = alarm) and stop the air curtain cooling if the condensate drain
tray is in danger of flooding (air curtain fans will continue to operate). There is a fixing
bracket with 8mm diameter hole attached to the drain tray inside the air curtain so a
condensate sensor can be fixed in the tray by the installer. The hole can be enlarged, if
necessary, to suit the type of sensor used so it is located in the tray at the appropriate
position, see the manufacturer's instructions that come with the condensate pump for
further information. A 230V AC, single phase electrical supply is provided inside the air
curtain to power a condensate pump and a condensate alarm connection is provided for
the condensate pump alarm circuit.
Warning: The air curtain condensate collection system is designed to remove condensate
with the air curtain operating in cooling mode during normal summer weather conditions in
countries with a temperate climate. In case of extreme weather conditions, drain tray
blockage or condensate pump failure, which can occur, it is vital that the design of the floor
beneath the air curtain and its surface is such that it will not become slippery or damaged if
it became wet. This is similar to the conditions that might be experienced with heavy
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 (which is how the air
curtain is supplied) and a condensate drain system is not fitted, it is still recommended 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.
The air curtain is designed only for use with a Mitsubishi Electric Mr Slim Outdoor Unit for
use on R410A. The complete Thermoscreens air curtain / Mitsubishi Electric heat pump
system, including refrigerant 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 the Mr Slim Outdoor Unit. All instructions should be kept by the
building facilities manager for future reference.
T9901105-1-1 UK
Page 7 of 42
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