Argo AWI726HL, Technical Data & Service Manual, Page: 15 / 38

5.FUNCTION
5-1 System operation control
The inputs to the systems come from indoor and outdoor sensors. The outdoor unit is the system
MASTER while the indoor one is the SLAVE.
Communication between units is made with a 2 poles RS485 bus
The indoor units receives the user input (fan speed, flap position etc) through remote controller
which sends signal every time a button is pressed and in any case, automatically, every 5 minutes.
5.1.1 control specification
During operation compressor speed can be subjected to change due to thermal load variations
or protection activations but in any case:
•
The minimum time interval between an OFF and a ON operation is not lower than 3 minutes
•
The minimum operating time is not lower than 3 minutes
•
The acceleration/deceleration rate is fixed at 50rpm /sec
•
During the start-up compressor speed increases according to a defined rule which is
independent from the thermal load calculation.
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