Mitsubishi Electric PUHY-EP250 Manuals

Manuals and User Guides for Mitsubishi Electric PUHY-EP250. We have 1 Mitsubishi Electric PUHY-EP250 manual available for free PDF download: Service Handbook

Mitsubishi Electric PUHY-EP250 Service Handbook

Mitsubishi Electric PUHY-EP250 Service Handbook (355 pages)

Brand: Mitsubishi Electric | Category: Air Conditioner | Size: 8 MB

Table of Contents

Safety Precautions
2
Precautions for Handling Units for Use with the Product
4
Before Installing the Unit
5
Before the Test Run
7
Table of Contents
8
Read before Servicing
10
Read before Servicing
12
I Read before Servicing
12
Necessary Tools and Materials
13
Piping Materials
14
- Copper Pipe Materials
  14
- Types of Copper Pipes
  14
- Radial Thickness
  14
- Flare Processing
  15
- Flare Nut
  15
Storage of Piping
16
Pipe Processing
16
Sealing the Pipe Ends
16
Brazing
17
Air Tightness Test
18
Vacuum Drying (Evacuation)
19
Refrigerant Charging
20
Remedies to be Taken in Case of a Refrigerant Leak
20
Characteristics of the Conventional and the New Refrigerants
21
- Refrigerant Composition
  21
- Pressure Characteristics
  21
Notes on Refrigerating Machine Oil
22
Effects of Contaminants
22
Restrictions

24
Outdoor Unit Components

56
Remote Controller

68
Electrical Wiring Diagram

78
- Electrical Wiring Diagram of the Outdoor Unit
  80
- Electrical Wiring Diagram of Transmission Booster
  82
Refrigerant Circuit

84
- Refrigerant Circuit Diagram
  86
- Principal Parts and Functions
  88
Control

92
- Functions and Factory Settings of the Dipswitches
  94
- Controlling the Outdoor Unit
  101
  - Startup Sequence Rotation
    101
  - Initial Control
    101
  - Control at Start-Up
    101
  - Bypass Control
    102
  - Compressor Frequency Control
    103
  - Pressure Limit
    103
  - Discharge Temperature Limit
    103
  - Periodic Frequency Control
    103
  - Defrost Operation Control
    104
  - Pipe Temperature
    104
  - Stopping the Defrost Operation
    105
  - Problems During Defrost Operation
    105
  - Change in the Number of Operating Indoor Units During Defrosting
    105
  - Refrigerant Recovery Control
    106
  - Capacity Control of Outdoor Fan
    106
  - Subcool Coil Control (Linear Expansion Valve LEV1)
    107
  - Refrigerant Flow Control
    107
  - Control at Initial Start-Up
    107
  - Emergency Operation Mode
    110
  - Starting the Emergency Operation
    110
  - Ending the Emergency Operation
    111
  - Communication Circuit Failure or When some of Outdoor Units Turned off
    111
  - Operation Mode
    112
- Operation Flow Chart
  114
  - Mode Determination Flowchart
    114
  - Operations in each Mode
    116
Test Run Mode

120
- Items to be Checked before a Test Run
  122
- Test Run Method
  123
- Operating Characteristic and Refrigerant Amount
  124
- Adjusting the Refrigerant Amount
  124
- Amount of Refrigerant to be Added
  125
- Refrigerant Amount Adjust Mode
  127
- The Following Symptoms Are Normal
  129
- Standard Operation Data (Reference Data)
  130
  - 2-Unit Combination
    136
  - 3-Unit Combination
    162
  - Single Unit (High-COP)
    176
Troubleshooting

210
LED Monitor Display on the Outdoor Unit Board

308
- How to Read the LED on the Service Monitor
  310
  - LED Display at Initial Setting
    310
  - Time Data Storage Function
    311
  - LED Monitor Display - Current Data
    312
  - LED Monitor Display - Data before Error
    322
  - LED Monitor Display - Data on Indoor Unit System
    329
  - LED Monitor Display - Setting Data
    336
  - Data on Indoor Unit System
    337
  - Other Types of Data
    352

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