Control During Low Outdoor Air Temperature Cooling; Low Outdoor Air Cooling In Conditions - Daikin VRV Inverter K Series Manual

SI-05C.BOOK Page 37 Monday, November 6, 2000 4:13 PM
SiE-05C

1.10 Control During Low Outdoor Air Temperature Cooling

When the outdoor air temperature is low in cooling operation, outdoor unit fans, electronic expansion valve
and compressors are controlled as follows in order to primarily maintain high pressure and to protect drop
in refrigerant circulation caused by drop in high pressure.
RSXY5K
Operating status
Normal operation
Low outdoor temperature
cooling operation
RSXY8,10K
Operating status
Normal operation
Low outdoor temperature
cooling operation
NOTE: Step No. changes according to high pressure, low pressure and frequency.
(Step No. increases with reduction of high and low pressure.)
Low Outdoor Air Cooling IN Conditions (Steps 1-1, 2, 3)
Conditions satisfied
• EV = 2000 pulses
(completely open)
or
• High pressure < 14 kg/cm²
(1.372 MPa)
or
• Low outdoor air cooling IN
conditions (Step 2)
Functions Inverter K Series
Electronic expansion valve
Fully open
Step 1 Fully open
Step 2 Fully open
Electronic expansion valve
Fully open
Step 1-1 Fully open
Step 1-2 Fully open
Step 1-3 Fully open
Step 2 Fully open
Normal operation
« • Cooling with compressor running
(doesn't include oil return)
&
• High pressure < 10 kg/cm²
Step 1-1
« carried out 30
continuous
seconds
Step 1-2
« carried out 30
continuous
seconds
Step 1-3
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Fan Frequency (Hz)
H Changes according to operating
status
L
OFF
Fan Frequency (Hz)
M1F M2F 8K
H ON Changes according to operating
status
L ON 96
H OFF 86
L OFF 76
OFF OFF 60
¥
• EV = 2000 pulses
(completely open)
• High pressure > 14 kg/cm²
¥ carried out 30
continuous
seconds
¥ carried out 30
continuous
seconds
Functions
76
48
10K
116
106
96
76
or
(1.372 MPa)
(VF006)
37