Use and Care Manual
Table Of Contents
- Foreword
- Safety Notice
- CONTENTS
- Safety Notice on Maintenance
- Safety Notice on Operation
- 1 Product Introduction
- NOTE: 1 Ton =12000Btu/h = 3.517kW 1.2 Electrical Parameters
- 2 Control
- 3 Troubleshooting
- 3.1 Wiring Diagrams
- 3.2 PCB Layout
- 3.3 Error Code
- 3.4 Troubleshooting
- 3.4.1 “E1” Compressor High Pressure Protection
- 3.4.2 “E3” Compressor Low-pressure Protection, Refrigerant Shortage Protection, Refrigerant Recovery Mode
- 3.4.3 “E4” Compressor Air Discharge High-temperature Protection
- 3.4.4 “F2” Condenser Temperature Sensor Error
- 3.4.5 “F3” Outdoor Ambient Temperature Sensor Error
- 3.4.6 “F4” Discharge Temperature Sensor Error
- 3.4.7 “F6” ODU Tube Temperature Sensor Error
- 3.4.8“EE” ODU Memory Chip Error
- 3.4.9 “H4” Overload
- 3.4.10 “H5” IPM Protection
- 3.4.11 “H6” DC Fan Error
- 3.4.12 “H7” Driver Out-of-Step Protection
- 3.4.13 “HC” PFC Protection
- 3.4.14 “Lc” Startup Failure
- 3.4.15 “P0” Driver Reset Protection
- 3.4.16 “P5” Over-Current Protection
- 3.4.17 “P6” Master Control and Driver Communication Error
- 3.4.18 “P7” Driver Module Sensor Error
- 3.4.19 “P8” Driver Module High Temperature Protection
- 3.4.20 “PA” AC Current Protection
- 3.4.21 “Pc” Driver Current Error
- 3.4.22 “PL” Bus Low-Voltage Protection
- 3.4.23 “PH” Bus High-Voltage Protection
- 3.4.24 “PU” Charge Loop Error
- 3.4.25 “ee” Drive Memory Chip Error
- 3.5 Failures Not Caused by Errors
- 4 Maintenance
- Appendices
- 1 Resistance/Temperature Lists of Temperature Sensors
- 1.1 Voltage List of 15 KΩ Temperature Sensors (including ODU temperature sensors)
- 1.2 Voltage List of 20 KΩ Pipeline Temperature Sensors (including temperature sensors for defroster, IDU and ODU pipes)
- 1.3 Voltage List of 50 KΩ Discharge Temperature Sensors (including discharge air temperature sensor)
- 2 Temperature/Pressure List of Refrigerant
- 3 Operation Tools
MRCOOL DC INVERTER COOLING ONLY CONDENSING UNIT
48
3.5 Failures Not Caused by Errors
(1) If your air conditioner fails to function normally, please first check the following items before maintenance:
Problem
Cause
Corrective measure
The air conditioner can't
run.
If you turn off the unit and then immediately turn it
on, in order to protect the compressor and avoid
system overload, compressor will delay running
for 3min.
Please wait for a while.
Wire connection is wrong.
Connect wires according to the wiring diagram.
Fuse or circuit breaker is broken.
Replace the fuse or switch on the circuit breaker.
Power failure.
Restart after power is resumed.
Power plug is loose.
Re-insert the power plug.
Thermostat has low battery.
Replace the batteries.
Bad cooling effect.
Air inlet and outlet of the units have been blocked.
Clear the obstacles and keep the room for the units
well ventilated.
Improper temperature setting.
Reset a proper temperature.
Fan speed is too low.
Reset a proper fan speed.
Air flow direction is not right.
Change the direction of air louvers.
Doors or windows are open.
Close them.
Exposed under direct sunshine.
Put on curtains or louvers in front of the windows.
Too many heat sources in the room.
Remove unnecessary heat sources.
Filter is blocked or dirty.
Send for a professional to clean the filter.
Air inlets or outlets of the units are blocked.
Clear away obstacles that are blocking the air inlets
and outlets of the units.