Outline of Control
SiE-05C
222
Functions PLUS Series
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.
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.
Indoor unit hot start during this time
Soft start
1 minute elapses
Liquid discharged
from accumulators of
all INV outdoor unit
• 5 minutes elapse
• High pressure > 14k
or
or
• 2 minutes elapse
• Low pressure < 1k
1 minute elapses
High pressure
differential of INV
outdoor unit reduced
Refrigerant
discharged from
heat exchangers
Normal control
• Initial aperture of EEV = 150 PLS
• Compressor frequency limit
• EEV of all outdoor units closed
• Hot gas bypass On with LP < 0.5k
• 30 Hz + OFF maintained
• Hot gas bypass OFF
after 30 sec.
• Compressor P1 control
• EEV = 0 PLS
(k:kg/cm
2
)
(VF104)
Compressor frequency
change during control
Lo
w pressure
Min. 1.2 k
continues
for 30 sec.
Min. 1.1 k
continues
for 30 sec.
Min. 1.0 k
continues
for 30 sec.
0.9k
0.8k
0.7k
9 6 Hz
8 6 Hz
7 6 Hz
6 0 Hz
• 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
• 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
• INV compressor frequency limit
• STD compressor ON + OFF
• Start of STD outdoor unit 1
superheating aperture control
• Hot gas bypass ON for all outdoor units
• INV compressor frequency limit
• STD outdoor unit 2 EEV = 0 PLS
• Start of indoor unit hot start
Start from 38 Hz + OFF
Liquid discharged
from accumulator
of STD outdoor
unit 1
Low pressure
line of STD
outdoor unit 2 is
opened.
Normal control
• 15 minutes elapse
• High pressure > 16k
• Min. 5 min. discharge
Superheating temp.> 30˚C
• 10 minutes elapse
• High pressure > 16k
• 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
• Fan H + ON for all outdoor units
Soft start
1 minute elapses
Liquid
discharged from
accumulators of
INV outdoor unit
Liquid
discharged from
heat exchanger
of STD outdoor
unit 1
Liquid
discharged from
heat exchanger
and low pressure
section of STD
outdoor unit 1
• 5 minutes elapses
• High pressure > 16k
• 3 minutes elapses
• High pressure > 16k
Same as heating pump down control
Compressor frequency
change during control
or
or
or
or
(k:kg/cm
2
)
(VF105)
SI-05C.BOOK Page 222 Monday, November 6, 2000 4:13 PM
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