Hitachi RAD-18NH7A Service Manual

Service Manual for Hitachi RAD-18NH7A Air Conditioner (107 pages)

Specifications:

660/660406-rad18nh7a.pdf file (16 Nov 2023)
  • Manufacturer: Hitachi
  • Category of Device: Air Conditioner
  • Document: RAD-18NH7A, File Type: PDF Service Manual
  • Updated: 16-11-2023
  • Count of Pages: 107
Download RAD-18NH7A Manual (107 pages)

Read PDF Document Online:

Data: UPD 16th November 2023

Hitachi RAD-18NH7A Air Conditioner PDF Service Manual (Updated: Thursday 16th of November 2023 06:16:42 AM)

Rating: 4.1 (rated by 56 users)

Compatible devices: RAC-70YHA4, RAF-25NXA1, RAF50NH4, RAS-30CP1R, RAS-X10CY, RAS-S18CPA, RAS-X13CBT, RAS-SX10HYK.

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Text Version of Hitachi RAD-18NH7A Air Conditioner Manual (Summary of Contents)

(Ocr-Read of Hitachi RAD-18NH7A Document (Main Content), UPD: 16 November 2023)

  • 38, Hitachi RAD-18NH7A – 43 – Reversing valve (heating “on” mode) NOTE (9) Notes: (1) Condition for entering into Cool Dashed mode. When fan set to “Hi” or “Auto mode” and temperature difference between indoor temperature and set temperature has a corresponding compressor rpm (calculated value…

  • 93, – 103 – POWER CIRCUIT Phenomenon 1 <Rotation speed does not increase> Is the DC voltage at least 350V? Is the OVL lamp lit? If the lamp is lit, it does not indicate fault, but the unit is overload status. Recheck cord, etc. of the system power module. If they are disconnect…

  • 16, – 14 – COOLING OPERATION Use the device for cooling when the outdoor temperature is – 10 ~ 43°C. If indoor humidity is very high (80%), some dew may form on the air outlet grille of the indoor unit. Press the FUNCTION selector so that the display indicates (COOL). Set the des…

  • 70, – 80 – ● R500, R253, detect the DC voltage at the power circuit. The microcomputer receives a DC voltage (260- 380V) via HIC 37 and applies correction to the overload set value so the DC current is low (high) when the DC voltage is high (low). (Since the load level is indicated b…

  • 59, – 69 – + U U V W — U + V — V + W — W _ + System Power Module 2 260V-360V R24 DC current (Id) detection resistor A U coil DC compressor motor V coil W coil B Fig. 3-5 ● Since current flows at point only when U+ transistor is ON, the current waveform at point becomes intermit…

  • 36, – 39 – 47. RAD-18NH7A, RAD-25NH7A, RAD-35NH7A, RAD-50NH7A 27 16 25 25 25 16 27 wireless remote controller. …

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