Daikin EWAQ032BAW - Compressor PI Control; Compressor Step Control

ESIE11-05 Basic Control
Functional Description 43
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]
Compressor step control
Compressor operations may vary with the following logic to information in “Compressor PI
Control” on page 43.
1* Maximum frequency depends on the unit.
2* First STD compressor starts. Only possible for EW*Q021BAW*, 025BAW*, 032BAW*,
040BAW* module, 050BAW* module and 064BAW* module.
3* Second STD compressor starts. Only possible for EW*Q032BAW* and EW*Q064BAW*
module.
Notes 1. Depending on operation of compressors, the compressors may run in different patterns as
shown here.
2. Double units EW*Q040-064BAW* module both circuits run, same pattern at the same time.
With a small exception of safeties and a small delay in bringing in STD compressor.
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.)
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.)
STD1 STD2
INV
Hz
max. 210 Hz
1*
min. 52 Hz
Inverter frequency graph
2* 3*