Daikin RMXS-L Series User Manual

SiUS181631EA Special Control
Functions and Control 57
3.2 Oil Return Operation
In order to prevent the compressor from running out of oil, the oil return operation is conducted to
recover oil flown out from the compressor to the system side.
3.2.1 Oil Return Operation in Cooling Operation
Conditions to start
Oil return operation in cooling operation is started referring to the following conditions:

Cumulative oil feed rate

Timer setting (Make this setting so as to start the oil return operation when the initial cumulative
operating time reaches 2 hours after power supply is turned ON and then every 8 hours.)
The cumulative oil feed rate is computed from Tc, Te, and compressor loads.
Outdoor unit actuator
Oil return preparation
operation
Oil return operation Post-oil-return operation
Compressor
Take the current step as the
upper limit.
52 Hz Full load (
→
Low
pressure constant control)
Same as in
oil return
operation mode.
Outdoor fan Fan control (Normal cooling) Fan control (Normal cooling) Fan control (Normal cooling)
Four way valve (Y1S) OFF OFF OFF
Main electronic expansion valve (Y1E) 480 pulse 480 pulse 480 pulse
Subcooling electronic expansion valve
(Y3E)
SH control 0 pulse 0 pulse
Hot gas bypass solenoid valve (Y2S) OFF OFF OFF
Ending conditions 20 sec.
•
3 min.
•
Ts1 – Te < 5
°
C
(9°F)
•
3 min.
•
Pe < 0.6 MPa
(201 ftAq)
•
HTdi > 110
°
C
(230°F)
or
or
Indoor unit actuator Cooling oil return operation
Indoor fan
Thermostat ON unit Remote controller setting
Stopping unit OFF
Thermostat OFF unit Remote controller setting
Electronic expansion valve of
BP unit
Thermostat ON unit SH control
Stopping unit 77 pulse
Thermostat OFF unit SH control

Daikin RMXS-L Series Specifications

General

Brand	Daikin
Model	RMXS-L Series
Category	Heat Pump
Language	English

Summary

Part 1 List of Functions

Part 2 Specifications

1.1 Outdoor Unit

Provides detailed specifications for the outdoor unit, including capacity, dimensions, and electrical data.

1.3 Indoor Unit

Part 4 Refrigerant Circuit

1.1 Outdoor Unit

1.2 Branch Provider (BP) Unit

3. Refrigerant Flow for Each Operation Mode

Diagrams illustrating refrigerant flow during cooling, heating, and oil return operations.

Part 5 Functions and Control

1. Operation Mode

2. Basic Control

3. Special Control

4. Protection Control

Covers critical protection controls for high/low pressure, temperature, inverter, freeze-up, and condensation.

6. Branch Provider (BP) Unit Control

Part 6 Test Operation and Field Settings

1. Test Operation

Provides procedures for initial test operation, including power checks and operation verification.

2. Field Settings

Details procedures for configuring field settings on outdoor units and remote controllers.

Part 8 Troubleshooting

1. Troubleshooting with LED

Guides troubleshooting using LED indicators on outdoor unit and service PCBs for error identification.

2. Service Diagnosis

Outlines service diagnosis procedures for various indoor unit series using remote controllers and error codes.

3. Error Codes and Description

Comprehensive list of error codes with descriptions and reference pages for troubleshooting specific issues.

4. Troubleshooting for CTXG, CTXS, FTXS, CDXS, FDXS, FVXS Series

Provides specific troubleshooting steps for errors found in CTXG, CTXS, FTXS, CDXS, FDXS, FVXS series.

5. Troubleshooting for FFQ Series

Offers troubleshooting steps for errors specific to FFQ Series indoor units, covering PCB, motor, and sensor issues.

6. Troubleshooting for Branch Provider (BP) Unit

Details troubleshooting procedures for the Branch Provider (BP) unit, including expansion valve and PCB abnormalities.

7. Troubleshooting for Outdoor Unit

Covers troubleshooting for outdoor unit issues like PCB abnormalities, sensors, compressor, and fan motor problems.