Daikin VRV S RXQ4/5ARV1 - Normal Control; Startup Control

Control for 6/8 HP Outdoor Unit SiAF332111E
70 Part 4 Functions and Control
2.4 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.
Pc : High pressure sensor detection value
Pe : Low pressure sensor detection value
Ta : Outdoor air temperature
Te : Low pressure equivalent saturation temperature
Td : Discharge temperature
2.4.1 Cooling Startup Control
2.5 Normal Control
2.5.1 List of Functions in Normal Control
Pc : High pressure sensor detection value
Pe : Low pressure sensor detection value
Tc : High pressure equivalent saturation temperature
Te : Low pressure equivalent saturation temperature
0 Hz
Step 4
Te < 10°C
Te
< Th2() – 10
&
INV  20 rps
Pc –
Pe  0.42 MPa
&
INV > 20 rps
Pc –
Pe  0.32 MPa
&
OR
Ta < 20°C: OFF
Ta  20°C: Step4
0 pulse
Frequency step up
5 sec. interval
+1step/15 sec. (Pc
> 2.16 MPa)
–1step/15 sec. (Pc
< 1.77 MPa)
Compressor (M1C)
Electronic expansion
valve (Injection)
(Y2E)
Fan motor (M1F)
 Th2 in "Pre-pressure
equalization"
Cooling
Part Name
Electric
Symbol
RXMQ-AR Function
Compressor motor M1C  PI control by Te target.
Fan motor M1F  Fan speed 9 steps to keep minimum Tc target 41°C.
Electronic expansion valve
(Injection)
Y2E 
0-480 pulse at compressor ON
Electronic expansion valve
(Refrigerant auto charge)
Y4E 
Minimum pulse
: equipped
—: not equipped