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Daikin VRV III-S RXYMQ36 48PVJU Service Manual: Special Control; Startup Control

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Special Control

3. Special Control
3.1
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. The inverter is turned ON to charge the capacitor.
In addition, 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. To position the four-way valve, the master and
slave units simultaneously start up.
3.1.1 Startup Control in Cooling Operation
Compressor
Outdoor unit fan
Four-way valve (Y1S)
Main electronic expansion
valve (EV1)
Subcooling electronic
expansion valve (EV3)
Hot gas bypass valve
(SVP)
Ending conditions
3.1.2 Startup Control in Heating Operation
Compressor
Outdoor unit fan
Four-way valve (Y1S)
Main electronic expansion
valve (EV1)
Subcooling electronic
expansion valve (EV3)
Hot gas bypass valve
(SVP)
Ending conditions
36
Thermostat ON
Pressure equalization control
prior to startup
0 Hz
STEP 7
Holds
0 pls
0 pls
OFF
• Pc - Pe<43.5 psi
OR
• A lapse of 1 to 5 min.
Thermostat ON
Pressure equalization control
prior to startup
0 Hz
From starting
~ 1 min. : STEP 7
1 ~ 3 min. : STEP 3
3 ~ 5 min. : OFF
Holds
0 pls
0 pls
OFF
• Pc - Pe<43.5 psi
OR
• A lapse of 1 to 5 min.
Startup control
STEP 1
57 Hz Unload
57 Hz Unload
+2 steps/20 sec.
(until Pc - Pe>43.5 psi is achieved)
Ta<68°F: OFF
+1 step/15 sec. (when Pc>313 psi)
Ta≥68°F: STEP 4
-1 step/15 sec. (when Pc<257 psi)
OFF
OFF
480 pls
480 pls
0 pls
0 pls
OFF
OFF
A lapse of 10 sec.
OR
Startup control
STEP 1
57 Hz Unload
57 Hz Unload
+2 steps/20 sec.
(until Pc - Pe>43.5 psi is achieved)
STEP 8
STEP 8
ON
ON
0 pls
0 pls
0 pls
0 pls
OFF
OFF
A lapse of 10 sec.
OR
SiUS34-907
STEP 2
• A lapse of 130 sec.
• Pc - Pe>56.6 psi
STEP 2
• A lapse of 130 sec.
• Pc>392 psi
• Pc - Pe>56.6 psi
Function

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R-410a

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  • cp shukla Feb 16, 2016 06:50:
    RXYQ18PAY6 service manual & vrv Fulform