High Pressure Control Step - Daikin VRV Inverter K Series Manual

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