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Installation and Maintenance

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Service Manual1
Table of Contents2
Table of Contents3
Technical Information4
Summary4
Indoor Unit4
Outdoor Unit4
Specifications5
Specification Sheet5
Operation Characteristic Curve7
Capacity Variation Ratio According to Temperature7
Cooling7
Heating7
Cooling and Heating Data Sheet in Rated Frequency8
Noise Curve8
Outline Dimension Diagram9
Refrigerant System Diagram10
Electrical Part11
Wiring Diagram11
PCB Printed Diagram13
Top View13
Bottom View13
Function and Control15
Remote Controller Introduction15
Buttons on Remote Controller15
Introduction for Buttons on Remote Controller16
Start/Stop Button16
Fan Auto Button16
Mode Button16
Light Button17
Sleep Button17
Turbo Button17
Replacement of Batteries in Remote Controller17
Brief Description of Modes and Functions18
Cooling Mode18
Dry Mode18
Fan Mode18
Sleep Function19
Timer Function19
Auto Restart Function19
Turbo Function19
Frequency Control20
Minutes Standby20
Compressor Protection Function20
Discharge Pipe Control20
Conditions for Start Controlling21
Management Within the Zones21
Freeze-Up Protection Control21
Input Current Control21
Heating Peak-Cut Control22
Heat Pump Only22
Defrost Control22
Conditions for Starting Defrost22
Fan Control22
Refrigerant Recycling Function23
Compulsive Defrosting Function23
Fan off Control When Stopped23
Enter Refrigerant Recycling Function23
Installation and Maintenance24
Notes for Installation24
Safety Precautions24
Electrical Safety Precautions24
Main Tools25
Installation and Maintenance26
Installation Dimension Diagram26
Start Installation27
Installation Parts28
Selection of Installation Location28
Electric Connection Requirement28
Installation of Indoor Unit28
Install Wall-Mounting Frame29
Outlet Pipe29
Connect the Pipe of Indoor Unit29
Install Drain Hose29
Installation of Outdoor Unit30
Connect Wire of Indoor Unit30
Bind up Pipe30
Hang the Indoor Unit30
Neaten the Pipes31
Connect Indoor and Outdoor Pipes31
Fix Outdoor Unit31
Install Drain Joint31
Vacuum Pumping and Leak Detection32
Use Vacuum Pump32
Check after Installation and Test Operation32
Leakage Detection32
Maintenance33
Error Code List33
- Malfunction Display Method33
- Display Control Viaremote Controller33
Troubleshooting for Main Malfunction41
Troubleshooting for Normal Malfunction42
- Wiring Diagram45
- 2-Way, 3-Way Valve Appearance50
- Air Purging51
Indoor Unit51
- Pumping down52
- Re-Air Purging53
- Balance Refrigerant of the 3-Way Valve54
Outdoor Unit54
- Evacuation55
- Vacuum Pump55
- Gas Charging56
- Troubleshooting for Normal Malfunction57
- Air Conditioner Can't be Started up57
- Poor Cooling for Air Conditioner57
- ODU Fan Motor Can't Operate58
- Compressor Can't Operate58
- Air Conditioner Is Leaking58
- Abnormal Sound and Vibration58
- Exploded View and Parts List59
- Removing Air Filters63
- External Features63
- Removal Procedure63
- Opening and Shutting Front Panel64
- Opening and Closing of Service Cover65
- Removal of Front Grille Assembly65
- Remove Electrical Box66
- Remove Piping Fixture67
- Remove Shaft Cushion Rubber Base68
- Remove the Pressure Plate of Motor68
- Removal Procedure of Outdoor Unit69
- Remove the Fan Motor70
- Reference Chart of Celsius and Fahrenheit73
- Set Temperature73
- Ambient Temperature73
- Configuration of Connection Pipe73
- Pipe Expanding Method74
- List of Resistance for Temperature Sensor75

Brand	Friedrich
Model	MRM12Y1J
Category	Air Conditioner
Language	English

Friedrich MRM12Y1J Service Manual

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