Mitsubishi Electric PK24FK User Manual

TECHNICAL & SERVICE MANUAL
SPLIT-TYPE, AIR CONDITIONERS
CONTENTS
1. FEATURES ···········································2
2. SPECIFICATIONS·································5
3. DATA·····················································6
4. OUTLINES AND DIMENSIONS··········13
5. REFRIGERANT SYSTEM DIAGRAM ······21
6. WIRING DIAGRAM·····························22
7. OPERATION FLOW-CHART··············26
8. MICROPROCESSOR CONTROL·······29
9. TROUBLESHOOTING························40
10. SYSTEM CONTROL···························48
11. DISASSEMBLY INSTRUCTIONS·······53
12. PARTS LIST········································60
13. OPTIONAL PARTS·····························74
<Indoor unit> <Outdoor unit>
Models
Indoor unit
Wall Mounted
Series PK
MITSUBISHI ELECTRIC
ON
DRY
COOL
FAN
CHECK
SET TEMP
TIMER OFF
AUTO STOP
AUTO START
F
HR
F
LOW HIGH
AUTO RETURN
CHECK TEST RUN
POWER
ON/OFF
MODE SELECT
SET
TEMPERATURE
FAN COOL/DRY
COOLERWARMER
TIMER MODE HOURS
FAN SPEED LOW/HIOGH
AIR
DISCHARGE
UP/DOWN
SWING
STOP
CHECK TEST RUN
•CENTRALLY CONTROLLED•
REMOTE CONTROLLER
The Slim Line.
From Mitsubishi Electric.
PK12FK / PU12EK
PK18FK / PU18EK 1
PK24FK / PU24EK 1
PK30FK / PU30EK 1
PK36FK / PU36EK 1
No. OC121
L
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OC121--1.qxp 24/6/97 2:11 AM Page 1

Mitsubishi Electric PK24FK Specifications

General

Brand	Mitsubishi Electric
Model	PK24FK
Category	Air Conditioner
Language	English

Summary

Features of the PK Series Air Conditioners

Compact Design Highlights

Highlights the reduced wall space required for the PK series air conditioners.

Noise Suppression and Comfort Enhancements

Details improvements in low-noise operation and airflow resistance for enhanced comfort.

Automatic Flap Shutter Functionality

Explains the auto flap shutter's role in closing the air outlet and adjusting airflow angle.

Flexible Installation Adaptability

Covers aspects like external piping, multi-directional piping, and ease of installation.

Advanced Microprocessor System

Ultra-Thin Remote Controller Design

Describes the streamlined, square remote controller designed for blendability with interiors.

Remote Controller LCD Display Features

Explains the visual display of operation modes, temperature, fan speed, and more.

Convenient 24-Hour Programmable Timer

Details the functionality of the timer for automatic unit operation scheduling.

Instant Fault Diagnosis Capability

Explains how the unit indicates faults via a self-diagnostic feature on the LCD.

Memory Feature for Storing Settings

Describes the unit's ability to memorize previous settings for consistent control.

Non-Polar Two-Wire Remote Controller Cables

Details the benefits of the slim, two-wire cable for remote controller installation.

Automatic Cooling and Heating Changeover

Explains the system that automatically switches between cooling and heating based on room temperature.

Pre-Charged Refrigerant System

High Reliability and Easy Servicing Aspects

Technical Specifications Overview

Data and Performance Information

Cooling Capacity Performance Details

Details cooling capacity based on indoor/outdoor air conditions and airflow.

Cooling Capacity Correction Factors

Provides correction factors for cooling capacity based on refrigerant piping length.

Cooling Performance Curves

Operating Range Specifications

Power Supply Requirements

Specifies the rating and allowable voltage ranges for indoor and outdoor units.

Operational Temperature and Humidity Ranges

Details the operating conditions for temperature and humidity for cooling.

Outline and Dimensions

Indoor Unit PK12FK Dimensions

Provides detailed dimensional drawings and mounting information for the PK12FK indoor unit.

Outdoor Unit PU12EK1 Dimensions

Shows dimensional drawings and installation considerations for the PU12EK1 outdoor unit.

Outdoor Unit PU18EK1 Dimensions

Provides dimensional drawings and installation details for the PU18EK1 outdoor unit.

Outdoor Units PU24/30EK1 Dimensions

Details the dimensions and installation aspects for the PU24/30EK1 outdoor units.

Outdoor Unit PU36EK1 Dimensions

Shows dimensional drawings and installation information for the PU36EK1 outdoor unit.

Remote Controller Dimensions

Presents dimensional drawings for the remote controller, including mounting details.

Refrigerant System Diagram

Wiring Diagrams

Indoor Unit PK12FK Wiring Diagram

Shows the electrical connections and components for the PK12FK indoor unit.

Outdoor Unit PU12/18EK1 Wiring Diagram

Details the electrical wiring and connections for PU12/18EK1 outdoor units.

Outdoor Units PU24/30/36EK1 Wiring Diagram

Presents the wiring diagrams for PU24/30/36EK1 outdoor units.

Operation Flow-Charts

Main Operation Logic

Illustrates the primary operational sequence and decision points of the air conditioner.

Cooling Operation Sequence

Details the step-by-step process and conditions for cooling mode operation.

Dry Operation Sequence

Outlines the sequence of operations and control logic for the dry mode.

Microprocessor Control System

Microprocessor Control System Overview

Explains the system architecture and communication flow between units and controllers.

Microprocessor Cooling Operation Control

Covers thermostat function, coil frost prevention, and outdoor unit abnormality detection.

Microprocessor Dry Operation Control

Details thermostat function, compressor control, and fan control during dry operation.

Remote Control Operation and LCD

Remote Control ON/OFF Operation

Describes how to turn the unit on and off using the remote control's power button.

Mode Selection via Remote Control

Details how to select operating modes like COOL, DRY, or FAN using remote control buttons.

Temperature Adjustment with Remote

Explains how to set the desired temperature using the WARMER and COOLER buttons.

Timer Functions on Remote Control

Covers setting ON/OFF timers and setback operations using the remote controller.

Fan Speed Control via Remote

Explains how to adjust the fan speed between LOW and HIGH using the remote control.

Remote Self-Diagnostic Function

Details how to activate and interpret the self-diagnostic function via the remote controller.

Remote Test Run Mode Operation

Explains how to initiate and use the test run mode from the remote controller.

Test Run Function Procedures

Pre-Operation Checks for Test Run

Covers checks required before performing the test run operation, including installation and wiring.

Performing Test Run Operation Steps

Provides step-by-step instructions on how to activate and use the test run function.

Emergency Operation Procedures

Pre-Operation Checks for Emergency Mode

Details checks required before enabling emergency operation, ensuring normal compressor and fan function.

Activating Emergency Operation Mode

Explains how to enable and use the emergency operation mode via dip switch settings.

Dip Switch and Jumper Connector Functions

Remote Controller Board Settings

Describes the functions of SW17 address selector and system backup switch.

Indoor Controller Board Settings

Details SW1 mode selector and other model-specific dip switches for indoor unit functions.

Indoor Controller DIP Switches (SW2-SW7)

Explains the function of SW2 address selector and other relevant switches.

Indoor Controller Jumper Connectors (J5)

Describes J5 for selecting heat pump models and its unavailability for PK-FK.

Outdoor Microprocessor Control

Outdoor Unit Protection Functions

Covers protection mechanisms like reversed phase, high pressure, and overcurrent detection.

Outdoor Coil Thermistor Control Logic

Explains how the outdoor coil thermistor controls fan speed and detects circuit issues.

Outdoor Unit Operation Control Methods

Details how the compressor receives signals from the indoor unit to start or stop.

Outdoor Fan Speed Control Mechanisms

Describes fan speed control based on outdoor coil temperature and fan output.

Initial Fan Speed Setting

Explains fan output settings upon power-on or compressor restart based on outdoor coil temperature.

Crankcase Heater Operation Control

Details the operation of the crankcase heater with and without jumper wire J3.

Fixed Fan Output Mode Activation

Explains how to fix the fan output speed and how to release this mode.

Outdoor Controller Board Switch Functions

Describes the functions of SW1, SW2, and SW3 switches on the outdoor controller board.

Power-On Reset State Operation

Details microprocessor operation during power-on-reset, including jumper wire functions.

100% Fan Output Configuration

Explains how to achieve 100% fan output by shorting CN22 and its conditions.

Time Shortening Functionality

Describes how shorting CN21 shortens various time delays like fan control period and time delays.

Troubleshooting Guide

Troubleshooting Test Run Issues

Addresses common problems encountered during test run operation and their causes.

Remote Self-Diagnostic Troubleshooting

Explains how to use the self-diagnostic function to identify and resolve malfunctions.

Outdoor Board Switch Service Data

Details how outdoor controller board switches and LEDs indicate service data and check codes.

Troubleshooting by Check Code

Lists check codes, diagnoses of malfunctions, and corresponding check points.

Outdoor Unit Not Working Troubleshooting

Addresses common causes and checks when the outdoor unit fails to operate.

Troubleshooting Wiring Errors

Identifies phenomena resulting from incorrect wiring between units and controllers.

Miscellaneous Troubles and Causes

Covers other common issues like vane problems, display errors, and power button failures.

System Control Configurations

System Control Options Overview

Describes different system control configurations: single remote, dual remote, individual, and multiple display.

Single Remote Group Control Setup

Explains how to control multiple units simultaneously with one remote controller.

Dual Remote Controller Operation Guide

Details how to use two remote controllers for unit control, including main/sub controller setup.

Remote ON/OFF and Individual Control Methods

Covers switch functions for controlling units remotely and individually.

Grouped Remote Control for Individual Units

Explains how to achieve individual unit control by grouping remote controllers.

Multiple Remote Control Display Installation

Describes the installation and wiring of a multiple remote control display adapter.

Disassembly Instructions

Indoor Unit PK24FK Disassembly Guide

Step-by-step guide for disassembling the PK24FK indoor unit components.

Outdoor Unit PU18EK Disassembly Guide

Provides instructions for disassembling the PU18EK outdoor unit, covering electrical and blower motor parts.

Outdoor Unit PU24EK Disassembly Guide

Details the disassembly procedure for the PU24EK outdoor unit, including electrical and blower motor parts.

Parts Lists

Indoor Unit Structural Parts

Lists structural components for PK12FK and PK18-36FK indoor units with part numbers.

Indoor Unit Electrical Parts

Lists electrical components for PK12FK and PK18-36FK indoor units with part numbers and wiring symbols.

Outdoor Unit Structural Parts

Lists structural components for PU12/18EK1, PU24/30EK1, PU36EK1 outdoor units with part numbers.

Outdoor Unit Functional Parts

Diagrams and list of functional components for PU12/18EK1, PU24/30EK1, PU36EK1 outdoor units.

Optional Parts and Accessories

Optional Refrigerant Pipes

Details available optional refrigerant pipe kits for different models and lengths.

Timer Features and Adapters

Covers timer specifications, features, connection, and adapter information.

Timer Adapter for System Control

Describes the purpose and connection of the timer adapter (PAC-SA89TA-E).

Multiple Remote Controller Adapter

Details the adapter (PAC-SA88HA-E) for connecting multiple remote controllers.

Centralized Remote Controller Unit

Explains the functions and dimensions of the centralized remote controller (PAC-805RC).

Program Timer Adapter Connection Guide

Details the connection method and wiring for the program timer adapter (PAC-825AD).