T9901105-1-1 UK
Page 5 of 42
DESIGN INFORMATION
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'. There is also a communications link with the Mr Slim outdoor unit
via connections S2 and S3 (S1 is not used).
AS SUPPLIED
the air curtain is set up for energy saving
Weather Compensation Control
or
Discharge Air Temperature Control
and is used with a Mitsubishi Electric PAR-W21
MAA Remote Controller. The following functions are available:-
On/Off control of the Mitsubishi Electric heat pump system
Mode change between Heating mode and Fan only mode (Cooling mode not
available)
Energy saving weather compensation control or discharge air temperature control via
a set target temperature.
Signal for when the outdoor unit is in defrost mode so the 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 heat pump system has a problem
Weather Compensation Control (HEATING ECO):
This looks at the outside air
temperature using an air sensor on the Mitsubishi Electric outdoor unit and automatically
adjusts the temperature of the air curtain discharge air in accordance with a heating curve.
It will select a warmer discharge air stream if it is cold outside and a cooler discharge air
stream if it is not so cold outside, as the discharge air does not need to be as warm. This
achieves significant energy and carbon savings because the heat pump compressor only
works at the capacity it needs to. Figure 1 shows a typical heating curve set up for weather
compensation control, temperature points 1, 2, 3 and 4 are selected during
commissioning.
Discharge Air Temperature Control (HEATING):
The end user sets a target temperature
of, say 35°C, the air curtain then controls the temperature of the discharge air so it will stay
at 35°C even if the inlet air temperature changes.
0
15
5
-5 20
Outdoor Air Temperature (°C)
40
20
30
Air Curtain
Discharge Air
Temperature (°C)
2
3
Figure 1
Weather Compensation Control
Typical heating curve
1
10
4
Heated Air Curtain
Ambient Air Curtain
