Daikin RXYQ-TA Series, Руководство по обслуживанию, Страница: 67 / 337

SiUS341615E Startup Control
Functions and Control 54
4. Startup Control
This control is used to equalize the pressure in the front and back of the compressor prior to the startup of the
compressor, thus reducing startup loads. Furthermore, the inverter is turned ON to charge the capacitor.
To avoid stresses to the compressor due to oil return or else after the startup, the following control is made and
the position of the four way valve is also determined. Start both the master and the slave units simultaneously to
position the four way valve.
4.1 Startup Control in Cooling
Pc : High pressure sensor detection value
Pe : Low pressure sensor detection value
Ta : Outdoor air temperature
Te : Low pressure equivalent saturation temperature
RXYQ72TA
RXYQ144/168TA
52
74
90
120
164
A
B
C
D
E
0 Hz
0 Hz
0 pulse
3,000 pulse (fully open)
Step 4
Pc – Pe > 0.78 MPa (113 psi)
Pc – Pe > 0.39 MPa (56.6 psi)
164 Hz or more
OR
&
Ta < 20˚C: OFF
(68˚F)
Ta
≥
20˚C: Step4
(68˚F)
Frequency step up
5 sec. interval
+1step/15 sec. (Pc > 2.16 MPa (313 psi))
–1step/15 sec. (Pc < 1.77 MPa (257 psi))
Inverter compressor 1
(M1C)
Inverter compressor 2
(M2C)
Electronic expansion
valve (main)
(Y1E)
Inverter fan
M1F: RXYQ72TA
M1F + M2F: RXYQ96-168TA
∗
RXYQ144/168TA only
Pc – Pe > 0.17 MPa (24.7 psi)
A
B
C
D
E
Frequency
(Hz)
RXYQ96/120TA
60
75
90
120
180