Brand: HITACHI
Category: Air Conditioner
Document Type: Manual
Language: EN
Available Languages: EN , ES
Manual for RAS-(3-6)HVRNM2E
Uploaded: Nov. 21, 2025, 8:36 p.m.
Manual Publish Date: 2011-08-01
Warranty Information
Warranty information is not explicitly stated in the provided manual sections.
The HITACHI UTOPIA DC-INVERTER IVX/(2/2.5)HP/ES SERIES service manual provides comprehensive information for servicing various outdoor unit models. It covers general information, unit installation, piping work and refrigerant charge, electrical wiring, control systems, optional functions, test runs, troubleshooting, spare parts, servicing procedures, electrical checks, and maintenance notes. The manual details specific procedures for different series (IVX, ES) and models, including safety precautions, installation space requirements, and maintenance records.
Troubleshooting and error codes
| No. | Check item | Action | Judgement | |
|---|---|---|---|---|
| 1 | Is the service area sufficient? | — | Yes | No |
| 2 | Is there a short circuit of the discharged air? | — | Yes | No |
| 3 | Any heat influence? | — | Yes | No |
| 4 | Is the ground wire connected? | — | Yes | No |
| 5 | Refrigerant piping. | — | Good | Not Good |
| 6 | Fixing the units. | — | Good | Not Good |
| 7 | Is there any damage on the outer surface or the internal surface? | Yes | No | — |
| 8 | Checking the screw and the bolts. | Tighten if loosened. | Tightened | Not Tightened |
| 9 | Tightening the terminal screws. | Tighten all the terminal screws with a Phillips screwdriver. | Tightened | Not Tightened |
| 10 | Are the compressor terminals tightly fixed? | Push all the terminals. | Pushed | Not Pushed |
| 11 | Insulation resistance. | Measure the insulation resistance with an insulation resistance meter. Comp. and fan. motor: greater than 3ΜΩ. Others: greater than 3ΜΩ. | Good | Not Good |
| 12 | Does the drain water flow smoothly? | Check the smooth flow by pouring some water. | Good | Not Good |
| 13 | Check for a leakage in the compressor. | Check for any leakage. | Good | Not Good |
| 14 | Check for a leakage in the outdoor heat exchanger. | ditto | Good | Not Good |
| 15 | Check for a leakage in the indoor heat exchanger. | ditto | Good | Not Good |
| 16 | Check for a leakage in the 4-way valve. | ditto | Good | Not Good |
| 17 | Check for a leakage in the check valve. | ditto | Good | No Good |
| 18 | Check for a leakage in the accumulator. | ditto | Good | Not Good |
| 19 | Check for a leakage in the strainer. | ditto | Good | Not Good |
| 20 | Check for a leakage in the electronic expansion valve | ditto | Good | Not Good |
| 21 | Check for a leakage in the piping. | ditto | Good | Not Good |
| 22 | Check the direction of the fans. | By viewing the airflow volume. | Good | Not Good |
| 23 | Voltage among each phase. | Higher than AC220V. | Good | Not Good |
| 24 | Vibration and sound. | Check the fan the compressor the piping and others. | Good | Not Good |
| 25 | Activation of each operation mode. | Check the activation of the COOL switch the HEAT switch the STOP switch and the TEMP switch. | Good | Not Good |
| 26 | High-pressure cut-out switch. | Check the actual activation value. | Good | Not Good |
| 27 | Check the activation of the drain-up mechanism. | Check the activation during the cooling process. | Good | Not Good |
| 28 | Air inlet temperature of the indoor unit DB/WB. | — | (°C)DB | (°C)WB |
| 29 | Air outlet temperature of the indoor unit DB/ WB. | — | (°C)DB | (°C)WB |
| 30 | Air inlet temperature of the outdoor unit DB/ WB. | — | (°C)DB | (°C)WB |
| 31 | Air outlet temperature of the outdoor unit DB/ WB. | — | (°C)DB | (°C)WB |
| 32 | High-pressure switch. | — | kg/cm²G | — |
| 33 | Low-pressure switch. | — | kg/cm²G | — |
| 34 | Operating voltage. | — | V | — |
| 35 | Operating current. | — | A | — |
| 36 | Instructions to the client for cleaning the air filter. | Done | Not yet | — |
| 37 | Instructions to the client about the cleaning method. | Done | Not yet | — |
| 38 | Instructions to the client about the operation. | Done | Not yet | — |