To Next PageTo Next PageHow to fix serial communication error on Mitsubishi Electric Air Conditioner?
If you are experiencing a serial communication error with your Mitsubishi Electric Air Conditioner, check the communication connections and reset the system.
How to fix remote controller sensor failure in Mitsubishi Electric PUHY-P250?
If the remote controller sensor fails on your Mitsubishi Electric Air Conditioner, check and replace the remote controller sensor if needed.
What to do if float switch connector is disconnected in Mitsubishi Electric Air Conditioner?
If the float switch connector is disconnected in your Mitsubishi Electric Air Conditioner, re-connect the float switch connector.
How to fix remote controller board failure (nonvolatile memory error) in Mitsubishi Electric PUHY-P250?
If the remote controller board fails due to a nonvolatile memory error in your Mitsubishi Electric Air Conditioner, reset or replace the remote controller board.
General| Model | PUHY-P250 |
|---|---|
| Type | Air Conditioner |
| Refrigerant | R410A |
| Power Supply | 380-415V, 50Hz |
| Operating Temperature (Cooling) | -5 to 46°C |
Check refrigerant type, symptoms, read precautions, prepare tools, verify pipes, and ventilate for leaks.
Lists tools for R410A exclusively, with restrictions, reusable with R407C, and prohibited tools.
Details copper pipe types, working pressure, radial thickness, and material requirements for R410A.
Proper indoor storage and sealing of pipes to prevent contamination and moisture infiltration.
Procedures for brazing, observing foreign object exclusion, using non-oxidized solder, and brazing material.
Pressurizing with nitrogen to design pressure for air tightness, considering temperature variations, and liquid state charging.
Using vacuum pumps with reverse-flow check valves, vacuum gauges, and evacuation time requirements.
Procedures for charging R410A refrigerant in liquid phase for safety and composition integrity.
If refrigerant leaks, it can be replenished; refer to specific section for details.
Compares chemical properties, composition, safety, molecular weight, boiling point, flammability, ODP, GWP, charging methods.
Discusses refrigerating machine oil in HFC systems, effects of contaminants like water, air, dust, and mineral oil.
Table summarizing compatible indoor units with different types of outdoor units, including standard combinations.
Details wiring work notes, control wiring types (M-NET transmission line), and maximum allowable lengths.
Information on switch settings for various units and controllers, and M-NET address settings.
Examples of typical system connections for MA remote controller, ME remote controller, and both.
Sample control wiring, cautions, and maximum allowable lengths for systems with MA remote controllers.
Sample control wiring, cautions, and maximum allowable lengths for group operation of units.
Sample control wiring, cautions, and maximum allowable lengths for systems with centralized control powered from an outdoor unit.
Sample control wiring, cautions, and maximum allowable lengths for systems with centralized control connected via indoor-outdoor transmission line.
Sample control wiring, cautions, and maximum allowable lengths for systems using ME remote controllers.
Front view of PUHY-P200/P250/P300/P350/P400YJM-A and PUHY-EP200/EP250YJM-A outdoor units.
Details the control box contents, including high-voltage warning and internal components like INV board and control board.
Explains the outdoor unit control board, its connectors, switches, and LEDs.
Details the M-NET board, its connectors, and terminal blocks for power and transmission lines.
Explains the INV board, its components like IGBT, capacitors, and connectors, with a high voltage warning.
Explains the fan board, its connectors, LEDs, and IPM module.
Details the noise filter, its connectors, fuses, and grounding terminals.
Compares MA and ME remote controllers regarding address settings, wiring, connection, and interlock functions.
Criteria for selecting MA or ME remote controllers based on system expansion, grouping, and installation requirements.
Explains how to perform group settings and interlock settings for LOSSNAY units using the ME remote controller.
Describes function selection modes for ME remote controller: Skip-Auto-Mode, temperature range, operation mode, and room temperature display.
Details the procedure for setting up LOSSNAY interlock with indoor units using the MA remote controller.
Provides the electrical wiring diagram for PUHY-P200/P250/P300/P350/P400 models.
Details the electrical wiring diagram for the transmission booster, including terminal blocks and connections.
Illustrates the refrigerant circuit for PUHY-P200/P250/P300/EP200 and PUHY-P350/P400/EP250 models.
Describes principal parts of the outdoor unit, their symbols, usage, specifications, and check methods.
Explains functions and factory settings of dipswitches on the outdoor unit control board for various features.
Details functions of indoor unit switches (SW1, SW3, SW2) and their factory settings.
Explains how to set the indoor unit address using DIP switches, based on 10's and 1's digits.
Explains the functions of switches on the MA remote controller for main/sub settings and other operational modes.
Describes how outdoor units (OC, OS1, OS2) are designated and how OC determines operation mode and communicates with indoor units.
Explains the startup sequence of outdoor units and how it changes after initial operation or when the compressor is in operation.
Describes the initial microcomputer processing after power-on, which takes up to 5 minutes.
Explains the upper limit of frequency during the first 3 minutes of operation and normal operation start after initial mode.
Details the functions of bypass solenoid valves (SV1a, SV9) during various operations like startup, defrost, and normal running.
Explains how compressor frequency is controlled to maintain constant evaporation/condensing temperatures, including pressure and discharge temperature limits.
Details the conditions for starting, stopping, and potential problems during defrost operation.
Explains refrigerant recovery procedures during heating and cooling operations to prevent accumulation.
Details how the outdoor unit fan speed is controlled by the inverter to maintain target evaporation and condensing temperatures.
Explains how OC, OS1, OS2 control the subcool coil using LEV based on various sensor readings.
Explains how refrigerant flow is controlled by LEV2 during heating, based on pressure and temperature sensor values.
Describes the initial startup mode and how the unit transitions to normal control after completion.
Explains emergency operation modes when units are in trouble or some units are turned off.
Details emergency operation when the OC is in trouble or when communication circuit failure occurs.
Explains how to select indoor and outdoor unit operation modes (Cooling, Heating, Dry, Fan, Stopping).
Describes DEMAND control, which prohibits cooling/heating operation via external input, and its step variations.
Provides a visual guide to operational logic for indoor and outdoor units.
Flowcharts illustrating outdoor unit operation in cooling and heating modes, including error conditions and fan control.
Covers checking for refrigerant leaks, loose connections, insulation resistance, valve status, phase sequence, and booster connection.
Step-by-step guide for performing a test run using the MA remote controller, including operation procedures and notes.
Explains refrigerant characteristics, operating conditions, and their impact on system performance and adjustments.
Details symptoms of overcharging/undercharging, and checks to estimate refrigerant amount during operation.
Provides factory-charged refrigerant amounts and calculation formulas for extended piping, including model-specific data.
Outlines procedures for adding or extracting refrigerant based on operational modes and sensor readings, including flowchart.
Lists normal symptoms that may occur during operation, such as indoor unit not starting, auto vane adjustment, and fan stopping during defrost.
Presents standard operating data for cooling operation of single-unit systems, including ambient temperature, piping, electrical, pressure, and temperature readings.
Lists various error codes, their definitions, and the units where they can occur.
Provides troubleshooting steps for specific error codes, such as 'Serial communication error' (0403).
Explains how to investigate transmission wave shape and noise issues on the M-NET transmission line.
Details troubleshooting steps for key components like the high-pressure sensor and low-pressure sensor.
Details procedures for finding refrigerant leaks in extension pipes and outdoor units during cooling and heating seasons.
Step-by-step instructions for removing compressor components and replacing the compressor.
Guides on how to interpret LED error displays on the outdoor unit control board and corresponding troubleshooting steps.
Details how to read the LED monitor display, including numerical values, flag displays, and SW1 settings.
Explains the information displayed on the monitor screen during initial settings, such as software version, refrigerant type, and model/capacity.
Explains the clock function for calculating current time and storing error history data.
Details current data items displayed by SW1 settings, including relay outputs, error displays, and operation modes.
Lists SW1 settings for items like self-address, RC address, OS address, and SW version.
Details SW1 settings for indoor unit items like gas pipe temperature.
