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Mitsubishi Heavy Industries FDC121KXZEN1 User Manual

Mitsubishi Heavy Industries FDC121KXZEN1
171 pages
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VRF INVERTER MULTI-SYSTEM AIR-CONDITIONERS
(OUTDOOR UNIT)
(Heat pump type)KXZ series
FDC121KXZEN1, 140KXZEN1, 155KXZEN1 (1 Phase)
FDC121KXZES1, 140KXZES1, 155KXZES1 (3 Phase)
SERVICE MANUAL
Manual No. '19 • KX-SM-318
Note:
(1) Regarding the Indoor unit series, refer to the No. ’17 • KX-T-266 and ’18 • KX-T-281.
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Mitsubishi Heavy Industries FDC121KXZEN1 Specifications

General IconGeneral
Cooling Capacity12.1 kW
Heating Capacity13.5 kW
Energy Efficiency Ratio (Cooling)3.21
Energy Efficiency Rating (Cooling)A++
Energy Efficiency Rating (Heating)A+
Power Supply220-240V, 50Hz
RefrigerantR410A
Indoor Unit Dimensions (W x H x D)1280 x 320 x 240 mm
Outdoor Unit Dimensions (W x H x D)970 x 980 x 370 mm
TypeSplit System Air Conditioner
Energy Efficiency Ratio (EER)3.21
Seasonal Energy Efficiency Ratio (SEER)6.10

Summary

Outline of Operation Control by Microcomputer

Remote control (Option parts)

Details wired remote control models RC-EX3A and RC-E5, their functions, displays, and operating methods.

Operation control function by the wired remote control

Explains wired remote control functions like CPU reset, power failure compensation, and various settings.

Operation control function by the indoor control

Covers indoor unit operations, including functional items during cooling/heating and timer settings.

Operation control function by the outdoor control

Describes outdoor unit controls, fan speed, defrost operations, and protective functions for optimal performance.

System Troubleshooting Procedure

Basics of troubleshooting

Provides a fundamental guide to troubleshooting by connecting the Mente PC for data analysis and diagnosis.

Explanation of troubleshooting

Details diagnostic steps for checking inverter PCB functionality and inspecting short-circuits on power transistor modules.

Contents of troubleshooting

Lists inspection displays for indoor/outdoor units and option controls, detailing error codes and their classifications.

Electrical Wiring

Piping System

Application Data

Outdoor Unit Disassembly Procedure

Indoor Unit Disassembly Procedure

Option controls

7-segment display PXX setting

Explains changing outdoor unit control settings via the 7-segment display and DIP switches.

Functions of outdoor PCB connectors CnS1 and CnZ1

Details selectable functions for CnS1 and CnZ1 connectors on the outdoor PCB using the 7-segment display.

Outdoor Operation Mode

Determination of outdoor operation mode

Defines how the outdoor unit's operation mode (Stop, Cooling, Heating) is determined based on indoor unit signals.

Priority in operation mode selection

Outlines the priority rules for operation mode selection, which can be adjusted via the 7-segment setting [P01].

VTCC : Variable Temperature and capacity control (VRF inverter Multi-system energy save control)

Correction of target high/low pressure

Explains how target pressures are adjusted based on indoor load conditions for optimal cooling and heating efficiency.

Data output

7-segment display

Describes the 7-segment display's function for showing operational data and aiding in malfunction diagnosis.

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