Compressor Pi Control - Daikin VRV III REYQ8PY1B Service Manual

Basic Control
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]
Controls compressor capacity to adjust Te to
achieve target value (TeS).
Te set value (Make this setting while in Setting
mode 2.)
Te setting
[Heating operation]
Controls compressor capacity to adjust Tc to
achieve target value (TcS).
Te set value (Make this setting while in Setting
mode 2.)
Tc setting
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]
One time after the
[Timing of outdoor rotation]
In start of startup control
106
L M (Normal)
(factory
setting)
3 6 7
L M (Normal) H
(factory
setting)
43 46 48
Outdoor Unit 1
Previous time Priority 1
This time Priority 2
Next time Priority 1
Outdoor Unit 1
Previous time Priority 1
This time Priority 3
Next time Priority 2
Priority 1
next
Te : Low pressure equivalent saturation
temperature (°C)
TeS : Target Te value
(Varies depending on Te setting, operating
frequency, etc.)
H *On multi-outdoor-unit systems, this control is made
according to values of the first-priority unit, which is
detected with the pressure sensor.
8 9 10 11
Tc : High pressure equivalent saturation
temperature (°C)
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.
Outdoor Unit 2
Priority 2
Priority 1
Priority 2
Outdoor Unit 2
Priority 2
Priority 1
Priority 3
Priority 2
SiBE37-701
Outdoor Unit 3
Priority 3
Priority 2
Priority 1
Priority 3
Function