Daikin VRV III REYQ10PY1B, Service Manual

Page: 117 / 472

Basic Control SiBE37-701
106 Function
2.2 Compressor PI Control
Compressor PI Control
Carries out the compressor capacity PI control to maintain Te at constant during cooling
operation and Tc at constant during heating operation to ensure stable unit performance.
[Cooling operation]
[Heating operation]
Rotation of outdoor units
In order to make operating time equal for each compressor of multi connection outdoor units,
outdoor units are used in rotation.
However this is not applicable to single units.
[Rotation of outdoor units]
[System with two outdoor units]
[System with three outdoor units]
[Timing of outdoor rotation]
In start of startup control
Controls compressor capacity to adjust Te to
achieve target value (TeS). Te : Low pressure equivalent saturation
temperature (°C)
Te set value (Make this setting while in Setting
mode 2.) TeS : Target Te value
(Varies depending on Te setting, operating
frequency, etc.)
*On multi-outdoor-unit systems, this control is made
according to values of the first-priority unit, which is
detected with the pressure sensor.
Te setting
L M (Normal)
(factory
setting)
H
3 6 7 8 9 10 11
Controls compressor capacity to adjust Tc to
achieve target value (TcS). Tc : High pressure equivalent saturation
temperature (°C)
Te set value (Make this setting while in Setting
mode 2.) TcS : Target Tc value
(Varies depending on Tc setting, operating
frequency, etc.)
*On multi-outdoor-unit systems, this control is made
according to values of the first-priority unit, which is
detected with the pressure sensor.
Tc setting
L M (Normal)
(factory
setting)
H
43 46 48
Outdoor Unit 1 Outdoor Unit 2
Previous time Priority 1 Priority 2
This time Priority 2 Priority 1
Next time Priority 1 Priority 2
Outdoor Unit 1 Outdoor Unit 2 Outdoor Unit 3
Previous time Priority 1 Priority 2 Priority 3
This time Priority 3 Priority 1 Priority 2
Next time Priority 2 Priority 3 Priority 1
One time after the
next
Priority 1 Priority 2 Priority 3