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VRF 50/60Hz
5 Normal Opera
5.1 Component Control during Normal Opera on
Table 3-5.1: Component control during normal cooling opera on
Component
Inverter compressor
DC fan motor
Electronic expansion valve
Four-way valve
Table 3-5.2: Component control during hea ng opera on
Component
Inverter compressor
DC fan motor
Electronic expansion valve
Four-way valve
5.2 Compressor Output Control
The compressor rota on speed is controlled according to the load requirement. Before compressor startup, the outdoor
unit first es mates the indoor unit load requirement according to the nominal capacity of indoor units currently running,
and then correct for ambient temperature. The compressors then start up according to the corrected load requirement.
During opera on the compressors are controlled according to the nominal capacity of indoor units currently running and
the indoor unit heat exchanger temperatures.
5.3 Compressor Step Control
The running speed of the compressors in rota ons per second (rps) is one third of the frequency (in Hz) of the electrical
input to the compressor motors. The compressor speed can be altered in increments of 1 rps.
5.4 Electronic Expansion Valve Control
The posi on of electronic expansion valves EXV is controlled in steps from 0 (fully closed) to 480 (fully open).
In cooling mode:
When the outdoor unit is in standby:
•
• EXV is at posi on 304 (steps).
•
When the outdoor unit is running:
• EXV is controlled according to discharge temperature.
In hea ng mode:
•
When the outdoor unit is in standby:
• EXV is at posi on 304 (steps).
•
When the outdoor unit is running:
• EXV is controlled according to discharge temperature.
22
n Control
Wiring diagram
label
COMP
FAN
EEV
ST1
Wiring diagram
label
COMP
FAN
EEV
ST1
28-56 model
•
Controlled according to load requirement
Fan speed controlled according to heat exchanger temperature
•
(T3), outdoor ambient temperature (T4),discharge temperature
(T5)and compressor frequency.
•
Controlled according to discharge temperature
•
Off
28-56
model
•
Controlled according to load requirement
Fan speed controlled according to outdoor unit heat exchanger
•
refrigerant temperature (T3),outdoor ambient temperature (T4)
and compressor frequency.
•
Controlled according to discharge temperature
•
On
Control func ons and states
Control func ons and states
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