Outline of Control SiE-05C
236 Functions PLUS Series
4.9 High Pressure Control Step
In order to regulate high pressure rise, the compressor’s operation capacity is reduced if high pressure
rises above the reference value. When heating, outdoor unit fans are set to (L + OFF), and indoor unit
solenoid valves are fully opened.
When cooling
During oil return only
Compressor frequency
limited ∗1
Upper limit frequency
1 step down from current
compressor frequency
High pressure reduced
by purging gas from receiver
(liquid pressure diverted to
low pressure)
Cancel
conditions
Limit cancel
at Hp ≤ 23
Cancel
conditions
Raised 1 step
at a time
at Hp ≤ 23
Cancel
conditions
Gas purge
stopped
at Hp < 21.0
Hp ≥ 24.7 Hp ≥ 24.2
Hp > 18.0
Hp > 24.0
When heating
1 When indoor unit ON by
thermostat capacity is less than
3 HP
HP ≥ 20
AND outdoor
temp. ≥ 15 C
HP ≥ 21
AND outdoor
temp. < 15 C
2 When no. of indoor units ON
by thermostat changes
Outdoor unit fan control
BL3K BL2K
OFF OFF
L + OFF
30Hz + OFF
(30Hz+OFF)+(ON+OFF)
(38Hz+OFF)+(ON+OFF)
+(ON+OFF)
L + OFF
L + OFF
INV
outdoor unit
STD
outdoor unit 1
STD
outdoor unit 2
When HPS of STD outdoor unit 1 or 2 is
turned ON during defrost, high pressure
is reduced by turning the fan of the HPS
ON outdoor unit to H + ON, and hot gas
bypass ON.
Compressor: 30 Hz + OFF
(STD outdoor unit OFF)
Fan: L + OFF
Outdoor unit
EEV: Initial value = 0 PLS
Indoor unit EEV: 2000 PLS
(All including units not running)
Compressor: 30 Hz + OFF
(STD outdoor units OFF)
Fan: L + ON
Outdoor unit EEV: Target evap.
temp. : 1 C
Indoor unit EEV: 2000 PLS
(OFF units not included)
Compressor: 30 Hz + OFF
(STD outdoor units OFF)
Fan: H + ON
Outdoor unit EEV: Target
superheating temp. = 10 C
Indoor unit EEV: 2000 PLS
(Thermostat ON units only)
Cancel
conditions
Hp < 14
Hp < 17.0 for
30 continuous
seconds
step2
step1
step3
Hp < 16.8 for
30 continuous
seconds
Cancel conditions
Hp < 16.5 for
30 continuous seconds
Up to 2 times within 30 min
Hp > 27.5
(HPS operation)
Hp > 25.0
Stop due to E3
malfunction
(standard type stopped
due to E0 malfunction)
Cancel
conditions
Operation OFF
Forced OFF by
thermosta
Cancel
conditions
Restart standby
∗1 Compressor capacity after limit
Compressor capacity
before limit
Capacity after limit
INV only running
INV and STD outdoor
unit 1 only running
INV, STD outdoor unit 1
and STD outdoor unit 2
running
∗Except for cooling only system
(VF118)
—
SI-05C.BOOK Page 236 Monday, November 6, 2000 4:13 PM
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