Brand: DAIKIN
Category: Refrigeration Unit
Document Type: Manual
Language: EN
Manual for LXE10E100
Uploaded: Sept. 12, 2025, 4:16 a.m.
- Starting operation: Connect the power plug, turn on the circuit breaker, close the control box cover, and press the UNIT ON/OFF key.
- Check items during operation: Visually check for abnormal noise/vibration, refrigerant shortage, moisture inclusion, and ensure the recorder is working. Verify operating conditions via the control panel.
- Procedure after operation: Turn off the UNIT ON/OFF key and circuit breaker, close the control box cover securely, and stow the power cable properly.
- Adjusting ventilation: Set the arrow mark of the handle to "CLOSE" when ventilation is not required or during frozen operation. Slide the handle upward when ventilation is required (chilled mode). Adjust the arrow mark on the nameplate according to the required ventilation amount.
Troubleshooting and error codes
| Symptom | Cause | Checkpoint | Remedy |
|---|---|---|---|
| Ⅰ Unit does not operate | A. Neither evaporator fan, condenser fan nor compressor runs. | Faulty power supply | Voltage on primary side of circuit breaker |
| Failure in running of condensor fan | Ensure that the condenser fan is stopped while high pressure is under control. (Increase the high pressure compulsorily, and make sure that the condensor fan stops when the HPT is 1000 kPa or more.) | ||
| Controller | Unit switch ON/OFF check, Alarm presence (F code) | ||
| Secondary side of power supply transformer | Check for disconnection of Fu1 (fuse), Check for malfunction in object models shown in section 7.11, Check for disconnection on secondary side of transformer (Tr), Connector type terminal board: Check of 24V between lead wires 101 and 104 | ||
| B. Evaporator fan runs, but condenser fan and compressor do not run. | Not malfunction (thermo-OFF status) | Display of controller (ALARM display) | |
| C. Evaporator fan and compressor run, but condenser fan does not run. | Not malfunction (high pressure control) | Check of operation of HPT (E101) by controller display | |
| External factor | Visual check for foreign matters caught in and deformation (including relevant parts such as controllers) | ||
| D. Condenser fan motor compressor run, but evaporator fan does not run. | Faulty electrical system of evaporator fan | ・CTP activation, ・Motor seizure (disconnection), ・Disconnected coil of magnetic contactor | |
| External factor | Visual check for foreign matters caught in and deformation (including relevant parts such as controllers) | ||
| E. Compressor runs, but evaporator fan and condenser fan do not run. | Not malfunction (defrost) | Check the lighting status of LED (red) of DEF on control panel | |
| F. Evaporator fan and condenser fan run, but compressor does not run (throbs) | Faulty power supply of compressor system, Burnt-out of compressor motor (disconnection), Faulty connection of terminal board of compressor (disconnection, entering of water) | Is the magnetic contactor for compressor turned ON? | |
| Disconnection of magnetic contactor coil | Is the voltage between the wiring 134 and 155 24V AC? | ||
| Faulty controller (Ry) Faulty RPP (reverse phase protector) | Is the voltage between the wiring 133 and 134 (1-2 of CN19) 24V AC? | ||
| Ⅰ Unit does not operate | Power supply of the controller cannot be turned on | ・R or T-phase is open ・Faulty power supply (voltage drop) ・Disconnection of power cable ・Faulty power plug | Is the voltage of three-phase power supply on the primary side of the circuit breaker 300 V or less? |
| Disconnection of fuse Fu6 circuit | Is the fuse Fu6 circuit disconnected? | ||
| Faulty transformer | Is the voltage at CN1 of TB1 20 V or less? | ||
| Ⅱ Unit operates but soon stops (full stop) | A. Unit operates but soon stops (full stop) | Refer the Alarm list (page 3-27) | — |
| B. Evaporator fan runs, but condenser fan and compressor stop soon. | Thermo OFF (normal) | — | |
| C. Compressor runs, but condenser fan and evaporator fan stop. | Defrost (normal) | — | |
| Ⅲ Inside temperature does not drop | Indicator flashes when the RS is 0˚C or less during frozen operation | Refrigerant shortage, Blocked pipe (parts) (including solenoid valves), Trap of air in refrigerant system | Gas leak check |
| The high pressure is excessively high | Faulty discharge pressure control valve DPR | Is the difference in pressure between the ports w and t 1000 kPa or more? | |
| The low pressure is excessively low | Faulty liquid solenoid valve LSV | Is the difference in pressure between the ports t and e 100 kPa or more? | |
| Blocked dryer | Is the difference in temperature of the pipe in front of and that back of dryer filter 5˚C or more? | ||
| The low pressure is excessively high | Entering of air | Check for entering of air referring to clause 4.1.4 (2) | |
| Frosted compressor body or suction pipe | Faulty high pressure transducer HPT | Is the difference in pressure between the pressure gauge and HPT 100 kPa or more? | |
| Gas shortage⇒Replace the refrigerant | |||
| Ⅳ Inside temperature does not rise (during heating operation) | The high pressure is excessively low | Faulty operation of valve (HSV or DSV) | Is the outlet piping of HSV, DSV cold? |
| The discharge gas temperature is low | Faulty operation of high pressure transducer HPT (charging is impossible) | Is the difference in pressure between the pressure gauge and HPT 100 kPa or more? | |
| The low pressure is excessively high | Faulty operation of low pressure transducer LPT (charging is impossible) | Is the difference in pressure between the pressure gauge and LPT 30 kPa or more? | |
| Displacement of HPT, DCHS (Stop of evaporator fan) | Is the DCHS or heat insulator installed inappropriately? | YES: Correct installation of DCHS. NO: Check the BSV connector or lead wire. | |
| Stop of evaporator fan | Is the magnetic contactor (high speed) for evaporator fan motor turned OFF? | YES: Faulty DCHS temperature detection⇒Replace. NO: Check the SMV. | |
| Reduced heating air volume (stop or drop of evaporator fan) | Is the evaporator fan motor stopped? | YES: Faulty motor⇒Replace. NO: Check the fan motor. | |
| Pressure leak to condenser due to leak from discharge pressure control valve (DPR) | HPT＜700kPa ? | YES: Leak from DPR⇒Replace the DPR. NO: Leak from ISV⇒Replace the ISV. | |
| Ⅴ Control is unstable (during chilled proportional control operation) | The control temperature is unstable | Faulty low pressure transducer LPT | Operating temperature is hunting |
| Faulty discharge pipe temperature sensor DCHS | Is the DCHS or heat insulator installed inappropriately? | ||
| Faulty opening of suction modulating valve SMV | The SMV opening is fixed to approx. 24%. | ||
| Faulty contact of solenoid valve (BSV) | Check the BSV connector or lead wire | ||
| Ⅵ Abnormal noise or vibration | Temperature continues to decrease | Disconnection of fuse (Fu2) circuit | Is the Fu2 circuit disconnected? |
| Faulty operation of defrost solenoid valve DSV | Is the DSV outlet pipe cold? | ||
| Stop of evaporator fan | The evaporator fan stops | ||
| Faulty operation of suction modulating valve SMV | Temperature continues to decrease | ||
| Temperature continues to increase | Excessive frost on evaporator | Is the opening of the SMV 36% or more? | |
| Opened discharge gas bypass solenoid valve BSV (dusts caught in) | Is the BSV outlet pipe hot? | ||
| Excessive frost on evaporator | Manual defrost | ||
| Abnormal noise | Malfunction of compressor inside Fan motor of evaporator, condenser ・Worn bearing | Auditory check | |
| ・Interference with fan guide | Auditory check Visual check | ||
| Compressor, fan motor ・Loosen bolt | Auditory check Visual check | ||
| Abnormal vibration | Piping ・Removed or loosen cramp | Auditory check Visual check | |
| Ⅶ Abnormal frosting on compressor | Abnormal frosting on compressor ・Frosting on terminal cover ・Frosting on compressor head | Dusts caught in injection solenoid valve ISV | Is the ISV outlet pipe frosted? (Leak from ISV) |
| Faulty operation of electronic expansion valve (EV) | Is there any frost on the compressor? | ||
| Ⅷ Abnormal frosting on compressor | The air cooling evaporator fan continues rotating | Water pressure switch WPS will not operate ・Water pressure is low ・Water temperature is excessively high ・Water flow rate is low | The high pressure is excessively high |
| Temperature in the control box is high | Is the condenser fan stopped when the CBS is cooled? | ||
| Water pressure switch WPS is short-circuited | WPS has continuity | ||
| Ⅸ Others | The remote monitoring RM is not output. | Disconnection of Fu9 | Is the fuse Fu9 circuit disconnected? |
| Short-circuit of RM circuit | Is there any short circuit or disconnection on the secondary side of RM junction port (on ship)? | ||
| Faulty controller ・Short-circ of RM circuit on ship | Is there any short circuit or disconnection on the primary side of RM connection port (on unit)? |