Compressor Pi Control - Daikin RXYQ96PYDN Service Manual

Basic Control
6.2

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 (F)
[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 (F)
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.
[Rotation of outdoor units]
For multiple outdoor units, an operational priority order is assigned to each outdoor unit on the
control purpose.
The operational priority orders of each outdoor unit are switched by means of outdoor unit rotation.
[System with two outdoor units]
[Timing of outdoor rotation]
In start of startup control
44
L M (Normal)
(factory
setting)
37 43 45
L M (Normal) H
(factory
setting)
109 114 118
Outdoor Unit 1
Previous time
This time
Next time
Te : Low pressure equivalent saturation
TeS : Target Te value
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.
46 48 50 52
Tc : High pressure equivalent saturation
temperature (°F)
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 1
Priority 2
Priority 1
temperature (°F)
(Varies depending on Te setting, operating
frequency, etc.)
Priority 2
Priority 1
Priority 2
VRVIII R-410A Heat Pump 60Hz
SiUS34-801A_b