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
59
NOTE:
Confirm whether the compressor needs to be replaced. The pipe mouths of the faulted compressor must be
sealed by adhesive tape as soon as the compressor is detached. Make sure the compressor is well preserved for
the ease of future analysis.
Step 6: Check the components
If the oil is contaminated, check the components of the unit, including the gas-liquid separator.
Check the gas-liquid separator
When the separator is detached, check whether there are impurities inside. For disassembly steps, refer to
section 4.5.
NOTE:
When pouring the liquid from the separator, make sure the discharge pipe is at the lower position.Slant at an
angle not larger than 20°
Use a transparent container to collect the content inside the separator. Check its color, seal it well and return
it to the factory for inspection.
NOTE:
If the compressor is damaged and needs to be replaced, the gas-liquid separator should also be replaced,
whether or not there are impurities in the separator or other abnormal conditions.
Confirm which parts of the system should be replaced. Make sure the pipe mouths of the damaged parts or
components are sealed by adhesive tape as soon as they are detached. Keep them in the original condition for
future analysis.
Step 7: Clear the pipeline
After confirming which parts of the system should be replaced, check the pipeline of the system. Blow
through the main pipeline with nitrogen. After clearing the pipeline, if the components are not replaced
immediately, seal the pipeline with adhesive tape to prevent the system from being contaminated by water and
impurities in the air.
Step 8: Replace the compressor
For the removal of compressor, please refer to the section: Removal of Major Components.
Step 9: Check/Replace the gas-liquid separator
NOTE:
If a compressor is damaged and needs to be replaced, its gas-liquid separator should also be replaced. This
is to avoid the abnormal condition of the separator from affecting the safe and reliable operation of the system.