Mitsubishi Electric PK12FK 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
I
S
T
E
D
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OC121--1.qxp 24/6/97 2:11 AM Page 1

Mitsubishi Electric PK12FK Specifications

General

Cooling Capacity	3.5 kW
Cooling Capacity (BTU)	12000 BTU
Heating Capacity	4.0 kW
Heating Capacity (BTU)	13600 BTU
Power Supply	220-240V, 50Hz
Type	Split System

Summary

Advanced Microprocessor

Easy to Use Features

Features like ultra-thin remote, LCD display, 24-hour timer, self-diagnosis, and memory feature.

Automatic Cooling/Heating Changeover

Data

Performance Data

Presents cooling capacity data based on indoor/outdoor air conditions.

Performance Curves

PK12FK Cooling Capacity Curve

Graph showing cooling capacity and power consumption vs. outdoor temp.

PK18FK Cooling Capacity Curve

Graph showing cooling capacity and power consumption vs. outdoor temp.

PK24FK Cooling Capacity Curve

Graph showing cooling capacity and power consumption vs. outdoor temp.

PK30FK Cooling Capacity Curve

Graph showing cooling capacity and power consumption vs. outdoor temp.

PK36FK Cooling Capacity

PK12FK Pressure Curves

Graphs for condensing and suction pressure vs. outdoor ambient temperature.

PK18FK Pressure Curves

PK24FK Pressure Curves

Graphs for condensing and suction pressure vs. outdoor ambient temperature.

PK30FK Pressure Curves

PK36FK Pressure Curves

Graphs for condensing and suction pressure vs. outdoor ambient temperature.

Standard Operation Data

Total Unit Data

Electrical Circuit Data

Refrigerant Circuit Data

Condensing/suction pressure, discharge/condensing temp, pipe length, charge.

Indoor Side Operation Data

Outdoor Side Operation Data

Operating Range

Power Supply Requirements

Rating and allowable voltage for indoor and outdoor units.

Operation Conditions

Additional Refrigerant Charge

Outline and Dimensions

Indoor Unit PK12FK Dimensions

Detailed dimensions and mounting points for the PK12FK indoor unit.

Refrigerant System Diagram

PK12/18/24FK Refrigerant Diagram

Refrigerant circuit diagram for PK12/18/24FK models.

PK30/36FK Refrigerant Diagram

Refrigerant circuit diagram for PK30/36FK models.

Wiring Diagram

Indoor Unit PK12FK Wiring

Wiring diagram for the PK12FK indoor unit, including component labels.

Indoor Unit Wiring PK18, 24, 30, 36FK

Outdoor Unit PU12/18EK 1 Wiring Diagram

Outdoor Unit PU24/30/36EK 1 Wiring Diagram

Operation Flow-Chart

Main Operation Flow-Chart

Flowchart illustrating the main operation sequence, including error handling.

Microprocessor Control Outline

Microprocessor Control System Overview

Overview of the microprocessor control system, showing input/output relationships.

Cooling Operation Details

Thermostat Function in Cooling

Details thermostat operation for cooling, including temperature settings and turn-on/off points.

Coil Frost Prevention

Explains the prevention of coil frosting during continuous compressor operation.

Coil Frost Protection Mode

Describes coil frost protection mode and its conditions, including allowance period.

Outdoor Unit Abnormality Detection

Detects outdoor unit abnormality based on temperature difference and time.

Dry Operation Details

Thermostat and Compressor Control in Dry

Details thermostat function and compressor control during dry operation.

Test Run Function

Before Test Run Procedures

Pre-test run checks for installation, piping, and wiring.

Test Run Operation Guide

Step-by-step guide on how to perform the test run operation.

Emergency Operation Procedures

How to enable emergency operation when the remote controller is faulty.

Dip Switch and Jumper Connector Functions

Remote Controller Switch Functions

Indoor Controller Board Switch Functions

Indoor Controller Board SW2/SW3 Functions

Model Selector Switches (SW5, SW6, SW7, J5)

Outdoor Microprocessor Control

Protection Functions

Describes protection functions like reversed phase, open phase, and board trouble detection.

Outdoor Coil Thermistor Control

Outdoor Fan Control

Outdoor Microprocessor Control (Cont.)

Crankcase Heater Control

Outdoor Controller Board Switches

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

Outdoor Microprocessor Control (Cont. 2)

Power-On Reset State Operation

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

Troubleshooting

Test Run Troubleshooting

Lists symptoms, causes, and check points for test run troubles.

Self-Diagnostic Function

Malfunction Display During Operation

Describes how malfunctions are displayed on the LCD during operation.

Using Self-Diagnostic Function

Guide on using the self-diagnostic function for normal and group control.

Troubleshooting by Check Code

Outdoor Unit Not Working Causes

Lists common causes and check points when the outdoor unit is not working.

Wrong Wiring on Site

Remote Controller to Indoor Unit Wiring Errors

Indoor to Outdoor Unit Wiring Errors

Other Troubles and Causes

System Control

System Control Function Variations

Describes different system control methods: group, dual remote, individual, multiple display.

Disassembly Instructions

Indoor Unit PK24FK Disassembly

Step-by-step instructions for disassembling the PK24FK indoor unit.

Indoor Unit PK24FK Disassembly (Cont.)

Indoor Unit PK24FK Disassembly (Cont. 2)

Outdoor Unit PU18EK Disassembly

Outdoor Unit PU18EK Disassembly (Cont.)

Heat Exchanger and Compressor Removal

Outdoor Unit PU24EK Disassembly

Outdoor Unit PU24EK Disassembly (Cont.)

Heat Exchanger and Compressor Removal (PU24EK)