Heating Pump Down Start (For Heat Pump System); Heating Power On Start (For Heat Pump System) - Daikin VRV Inverter K Series Manual

SI-05C.BOOK Page 222 Monday, November 6, 2000 4:13 PM
Outline of Control
4.1.3

Heating Pump Down Start (For Heat Pump System)

When starting within 3 hours after the compressor stops and pump down residual operation has been
executed before the compressor was stopped, after completing soft start, compressor operating frequency
is held to (60 Hz + OFF) ~ (96 Hz + OFF), the heat exchange pressure equalizing piping solenoid for
standard types 1 and 2 is opened, and the refrigerant in the accumulator of the inverter type is discharged.
The frequency is further maintained at (30 Hz + OFF) for 1 minute, refrigerant in outdoor unit heat
exchangers is evaporated by shutting off hot gas, and operation switches to normal control.
1 minute elapses
Soft start
from accumulators of
• Compressor frequency limit
• EEV of all outdoor units closed
• Hot gas bypass On with LP < 0.5k
Compressor frequency
change during control
4.1.4

Heating Power on Start (For Heat Pump System)

Discharge refrigerant collected in the low pressure side to protect the compressor when starting for the first
time within 6 hours after turning off the power.
After completing soft start, compressor operating frequency is held to (60 Hz + OFF) ~ (96 Hz + OFF).
After the refrigerant in the pressure equalizing line and accumulator of the inverter type is discharged, the
standard compressors start in sequence, and refrigerant is discharged from each respective low pressure
line.
1 minute elapses
Liquid
Soft start
discharged from
accumulators of
INV outdoor unit
• INV compressor frequency limit
• EEV for all outdoor units = 0 PLS
• Hot gas bypass ON for all outdoor units
• Fan H + ON for inverter compressor
Compressor frequency
change during control
Same as heating pump down control
222
• 5 minutes elapse
or
• High pressure > 14k
High pressure
Liquid discharged
differential of INV
outdoor unit reduced
all INV outdoor unit
• 30 Hz + OFF maintained
• Hot gas bypass OFF
after 30 sec.
Indoor unit hot start during this time
0.9k
0.8k
0.7k
• 15 minutes elapse
• High pressure > 16k
or
• Min. 5 min. discharge
• 10 minutes elapse
Superheating temp.> 30˚C
or
• High pressure > 16k
Liquid
discharged from
heat exchanger
of STD outdoor
unit 1
• INV compressor frequency limit
• Start of INV outdoor unit EEV
superheating aperture control
• STD outdoor unit 1 EEV = 2000 PLS
• Hot gas bypass ON for all outdoor units
• STD outdoor unit 1 fan H + ON
• 2 minutes elapse
1 minute elapses
or
• Low pressure < 1k
Refrigerant
discharged from
heat exchangers
• Initial aperture of EEV = 150 PLS
• Compressor P1 control
• EEV = 0 PLS
Min. 1.2 k
continues
for 30 sec.
Min. 1.1 k
continues
for 30 sec.
Min. 1.0 k
continues
for 30 sec.
• INV compressor frequency limit
• STD outdoor unit 1 EEV = 0 PLS
• STD outdoor unit 2 EEV = 2000 PLS
• Hot gas bypass ON for all outdoor units
Liquid
• Fan H + ON for all outdoor units
discharged from
heat exchanger
and low pressure
section of STD
outdoor unit 1
• 5 minutes elapses
or
• High pressure > 16k
• 3 minutes elapses
or
• High pressure > 16k
Liquid discharged
Low pressure
from accumulator
line of STD
of STD outdoor
outdoor unit 2 is
unit 1
opened.
• INV compressor frequency limit • INV compressor frequency limit
• STD compressor ON + OFF • STD outdoor unit 2 EEV = 0 PLS
• Start of STD outdoor unit 1 • Start of indoor unit hot start
superheating aperture control
• Hot gas bypass ON for all outdoor units
: http://splitoff.ru/tehn-doc.html
SiE-05C
Normal control
2
(k:kg/cm )
9 6 Hz
8 6 Hz
7 6 Hz
6 0 Hz
(VF104)
(k:kg/cm 2 )
Normal control
Start from 38 Hz + OFF
(VF105)
Functions PLUS Series