Heating Start Following Layup (For Heat Pump System) - Daikin VRV Inverter K Series Manual

SI-05C.BOOK Page 223 Monday, November 6, 2000 4:13 PM
SiE-05C
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
1 minute elapses
Liquid
Soft start
discharged from
INV outdoor unit
• 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
Compressor frequency
change during control
Same as heating pump down control
Functions PLUS Series
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)
• 4 minutes elapses • 30 seconds elapses
or or
• High pressure > 16k • High pressure > 16k
Starting
preparation for
STD outdoor unit
• 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
• 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
STD outdoor
unit 1 starts
• 20 seconds elapses
or
• High pressure > 17k
Starting preparation
for STD outdoor unit
or • 10 seconds elapses • 10 seconds elapses.
• High pressure >17k
• High pressure > 17k
• Discharge superheating temp.
or
or • 30 seconds elapses
of INV outdoor unit > 20˚C
• High pressure > 17k
for 3 min.
STD outdoor Normal control
unit 2 starts preparation
Compressor initial frequency limit
• 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
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Outline of Control
2
(k:kg/cm )
Normal control
=(48Hz + OFF) +
(ON OFF) +
(ON OFF)
(VF106)
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