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Electronic control description
Introduction
WARNING
Installation
requirements
Controller
Controller
Functionallity
8
This section describes key features of the electronic control, and how it operates.
Never carry out any installation, maintenance or service, without disconnecting the DC
power supply, by means of the external power supply disconnecting devices.
Please incorporate the following when installing the electrical connections:
1.
Any external supply should be protected, with an external disconnecting device
2.
These disconnecting device, needs to be labelled, with rated voltage as well as
rated current
3.
All cables, in a permanent installation, are imperative to install and secure
properly, to prevent any damage to equipment and/or humans.
Secure all cables with cable ties or appropriate cable fasteners, made for this
purpose.
Embedded controller
The control board controls fans and cooling compressor according to the temperature
in return air flow. The cooling capacity is automatically adjusted to match the present
heat dissipation from the affiliated applications, so the airconditioner always uses min-
imum energy according to heat load.
Phase
1
When power is on, the evaporator fan will circulate the indoor air repeatedly
on idle speed.
2
When return air temperature reaches the predefined set point, internal fan
will speed up, the compressor will start on minimum rotation speed. In case
temperature keeps rising the compressor rotation speed will increase until a
balanced condition between the applied heat dissipation and cooling perfor-
mance has been obtained.
3
Temperature set point can adjusted in 5 fixed levels; 20℃-25℃-30℃-35℃-
40℃
4
If return air temperature drops below the hysteresis (set point – hysteresis),
the compressor will be stopped, the evaporator fan (internal fan) will keep
circulating internal air on idle speed, to prevent build-up of local hot spots.
5
Condenser fan speed is controlled according to condenser temperature to
keep acoustic noise level as low as possible.
6
Compressor has restart delay to protect the compressor against excessive
on/off cycling. Pre-set to 5 minutes.
Operating parameters can be adjusted to comply with specific operating conditions.
Description
Continued overleaf
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