12 | RS8EU702 |
Applications
Here is a survey of the controller’s eld of application.
A setting will dene the relay outputs so that the
controller’s interface will be targeted to the chosen
application.
On page 28 you can see the relevant settings for the
respective wiring diagrams.
S3 and S4 are temperature sensors. The application will determine whether
either one or the other or both sensors are to be used. S3 is placed in the air
ow before the evaporator. S4 after the evaporator.
A percentage setting will determine how the control is to be based. S5 is a
defrost sensor and is placed on/in the ns of the evaporator.
S6 is a product sensor.
DI1, DI2 and DI3 are contact functions that can be used for one of the fol-
lowing functions: door function, alarm function, defrost start, external main
switch, night operation, change of thermostat reference, appliance cleaning,
forced refrigeration or coordinated defrost. DI3 has a 230 V input. See the
functions in settings o02, o37and o84.
2
3
4
General:
The eight applications are all adapted for
commercial refrigeration systems in the form of
either refrigeration appliances or cold storage
rooms.
In general all have outputs for:
• Solenoid valve or compressor
• Fan
• Defrost
• Light
In addition they have dierent uses and thereby
input and outputs.
Application 1
Standard applications.
Application 2
Control of night blinds
Night blinds follow the status of the light function
– when the light is switched on, the night blinds
are up and when the light is switched o, the night
blinds are down. In addition a digital input provides
the option of forced opening of the blinds so that
the appliance can be lled with products.
Application 3
”Two-compressor” operation.
The two compressors must be of the same size. On
start-up (after defrosting, operational stop, etc.)
both compressors are started with a set time shift.
One compressor starts at half the dierential so that
an optimum adaptation of compressor capacity
takes place for the current load in the appliance/
room. There is automatic runtime equalisation
during cyclic operation.
For a more detailed description please refer to
earlier sections in the manual.
Application 4
Hot gas defrosting.
Hot gas defrosting is adapted to commercial
appliances/rooms with limited system lling.
One relay controls the main valve in the suction
line.
A changeover relay controls both the hot gas valve
and the drain valve.
This means that there is no time delay between
stops of hot gas and start of draining.
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