Daikin VRV S RXQ4/5ARV1 - Control for 6;8 HP Outdoor Unit

Control for 4/5/10/12 HP Outdoor Unit SiAF332111E
62 Part 4 Functions and Control
1.3.3 Pump Down Residual Control
When activating the compressor, if liquid refrigerant remains in the evaporator, the liquid enters
the compressor and dilutes oil therein resulting in a decrease in lubricity.
Therefore, pump down residual control is performed to collect refrigerant in the evaporator when
the compressor is stopped.
Pump Down Residual Control in Cooling Operation
1.3.4 Restart Standby
Restart is forced into standby to prevent the power from frequently turning on and off and to
equalize pressure in the refrigerant system.
Ta: Outdoor air temperature
1.3.5 Stop Control
Actuator operation is cleared when the system is down.
Outdoor Unit
Actuator
Electric symbol
Pump down residual
control: Step 1
Pump down residual
control: Step 2
RXQ4ARV1 RXQ5ARV1
RXMQ
10/12ARY1
Compressor M1C M1C M1C 124 Hz Minimum frequency
Outdoor fan
M1F M1F
M1F
M2F
Fan control Fan control
Electronic
expansion valve
(Main)
――Y1E
Fully open Fully open
Electronic
expansion valve
(Injection)
――Y2E
0 pulse 0 pulse
Hot gas bypass
valve
Y2S ― ―
OFF OFF
Ending conditions 2 seconds 2 seconds
Outdoor Unit Actuator
Electric symbol
Operation
RXQ4ARV1 RXQ5ARV1
RXMQ
10/12ARY1
Compressor M1C M1C M1C OFF
Outdoor fan
M1F M1F
M1F
M2F
Ta > 30°C: STEP 4
Ta  30°C: OFF
Electronic expansion valve (Main) ― ― Y1E 0 pulse
Electronic expansion valve (Injection) ― ― Y2E 0 pulse
Hot gas bypass valve Y2S ― ― OFF
Ending conditions 2 minutes
Outdoor Unit Actuator
Electric symbol
Operation
RXQ4ARV1 RXQ5ARV1
RXMQ
10/12ARY1
Compressor M1C M1C M1C OFF
Outdoor fan
M1F M1F
M1F
M2F
OFF
Electronic expansion valve (Main) ― ― Y1E 0 pulse
Electronic expansion valve (Injection) ― ― Y2E 0 pulse
Hot gas bypass valve Y2S ― ― OFF
Ending conditions Indoor unit thermostat is turned ON.