SiE-05C
Outline of Control
Functions PLUS Series
223
4.1.5
Heating Start Following Layup (For Heat Pump System)
Discharge refrigerant from outdoor unit or pressure equalizing piping when starting if the compressor has
been stopped for 3 hours or more or when starting for the first time after turning on the power. Also
discharges refrigerant when starting for the first time if the 6 or more hours has elapsed since turning on
the power.
After completing soft start, compressor operating frequency is held to (60 Hz + OFF) ~ (96 Hz + OFF),
refrigerant in the pressure equalizing line and low pressure line is discharged and the unit is prepared for
normal compressor control.
Conditions for layup starting after tuning on the power
OR
Inverter comp. oil temp. > outdoor temp. + 15˚C
Inverter comp. discharge temp. > outdoor temp. + 10˚C (Outdoor temp.
≥
0˚C)
Inverter type comp. discharge temp. > 10˚C (Outdoor tem.
≥
0˚C)
• INV compressor frequency limit
• Compressor of STD outdoor unit 1 & 2 : ON+OFF
• INV outdoor unit EEV = 0 PLS
• EEV for all outdoor units = 0 PLS
• Hot gas bypass ON for all outdoor units
• Indoor unit hot start
• INV compressor frequency limit
• STD outdoor unit compressor : ON + OFF
• INV outdoor unit EEV = 0 PLS
• EEV for all outdoor units = 0 PLS
• Hot gas bypass ON for all outdoor units
• Indoor unit hot start
Soft start
1 minute elapses
Liquid
discharged from
INV outdoor unit
Starting
preparation for
STD outdoor unit
STD outdoor
unit 1 starts
Starting preparation
for STD outdoor unit
or
• 4 minutes elapses
• High pressure > 16k
or
• 30 seconds elapses
• High pressure > 16k
or
• 20 seconds elapses
• High pressure > 17k
or
• 10 seconds elapses
• High pressure >17k
or
• 30 seconds elapses
• High pressure > 17k
or
• 10 seconds elapses.
• High pressure > 17k
• Discharge superheating temp.
of INV outdoor unit > 20˚C
for 3 min.
• INV compressor frequency limit
• INV outdoor unit EEV = 0 PLS
• STD outdoor unit 1 & 2 EEV = 2000 PLS
• Hot gas bypass ON for all outdoor units
• INV compressor frequency limit
• INV outdoor unit EEV = 0 PLS
• STD outdoor unit 1 EEV = 0 PLS
• Hot gas bypass ON for all outdoor units
STD outdoor
unit 2 starts
Normal control
preparation
Normal control
Compressor initial frequency limit
=(48Hz + OFF) +
(ON OFF) +
(ON OFF)
• INV compressor frequency limit
• Compressor of STD outdoor unit 1 & 2 : ON+OFF
• Start of INV outdoor unit EEV superheating aperture control
• EEV for all outdoor units = 0 PLS
• Hot gas bypass ON for all outdoor units
• Indoor unit hot start
Same as heating pump down control
Compressor frequency
change during control
(k:kg/cm
2
)
(VF106)
SI-05C.BOOK Page 223 Monday, November 6, 2000 4:13 PM
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