Mitsubishi Heavy Industries FDT125VNAWVH Manuals

Manuals and User Guides for Mitsubishi Heavy Industries FDT125VNAWVH. We have 1 Mitsubishi Heavy Industries FDT125VNAWVH manual available for free PDF download: Service Manual

Mitsubishi Heavy Industries FDT125VNAWVH Service Manual (205 pages)

MICRO INVERTER PACKAGED AIR-CONDITIONERS (Split system, air to air heat pump type)

Brand: Mitsubishi Heavy Industries | Category: Air Conditioner | Size: 41.54 MB

Table of Contents
3
Outline of Operation Control by Microcomputer
6
Remote Control
6
Wireless Remote Control
8
Unit Display Section
10
CPU Reset
11
Operation Control Function by the Wired Remote Control
11
Power Failure Compensation Function (Electric Power Source Failure)
11
Switching Sequence of the Operation Mode Switches of Remote Control
11
Alert Displays
12
Operation Control Function by the Indoor Control
14
Dehumidifying (DRY) Operation
15
Operations of Functional Items During Cooling/Heating
15
Rc-E5
16
Timer Operation
16
Ending Condition
17
Hot Start (Cold Draft Prevention at Heating)
17
Auto Swing Control (FDT, FDTC, FDE Only)
18
Hot Keep
18
Thermostat Operation
19
Compressor Inching Prevention Control
20
Filter Sign
20
Drain Pump Control
21
Drain Pump Motor (DM) Control
21
Operation Check/Drain Pump Test Run Operation Mode
21
Anomalous Fan Motor
22
Cooling, Dehumidifying Frost Protection
22
Heating Overload Protection
22
High Ceiling Control
23
Plural Unit Control – of 16 Units Group by One Remote Control
23
Abnormal Temperature Sensor Broken Wire/Short-Circuit Detection
24
External Input/Output Control (Cnt or Cnta)
24
Operation Permission/Prohibition
26
Selection of Cooling/Heating External Input Function
28
Temporary Stop Input
28
Fan Control at Heating Startup
29
Home Leave Mode
29
Return Air Temperature Compensation
29
Room Temperature Detection Temperature Compensation During Heating
29
Auto Fan Speed Control
30
Fan Circulator Operation
30
Indoor Unit Overload Alarm
30
Peak-Cut Timer
30
Motion Sensor Control
31
SRK Series
33
Unit ON/OFF Button
33
Auto Swing Control
34
Indoor Fan Motor Protection
36
Outline of Heating or Cooling Operation
36
Serial Signal Transmission Error Protection
36
Outline of Automatic Operation
37
Frost Prevention Control
39
Outline of Dehumidifying (DRY) Operation
41
Compressor Start Control
42
Determination of Compressor Speed (Frequency)
42
Operation Control Function by the Outdoor Control
42
Compressor Soft Start Control
43
Outdoor Fan Control
44
Defrost Operation
45
Protective Control/Anomalous Stop Control
46
Anomaly Detection Control by the High Pressure Switch
47
Low Pressure Control
47
Over-Current Protection Current Safe Controls I, II
47
Anomalous Power Transistor Current
48
Dewing Prevention Control
48
Power Transistor Protection from Voltage Drop
48
Refrigerant Quantity Shortage Protection
48
Broken Wire Detection on Temperature Sensor
49
Fan Motor Error
49
Silent Mode
49
Test Run
49
Pump-Down Control
50
Check Indicator Table
51
Diagnosing of Microcomputer Circuit
51
Maintenance Data
51
Selfdiagnosis Function
51
Display Sequence of Error Codes or Inspection Indicator Lamps
55
Error Log and Reset
56
Troubleshooting Procedure
56
DIP Switch Setting List
62
Indoor Fan Motor Error
64
Inspection Procedures Corresponding to Detail of Trouble
64
Sensor Error
64
Error of Signal Transmission
65
Checking the Indoor Electrical Equipment
66
Humidity Sensor Operation
66
Phenomenon Observed after Shor-Tcircuit, Wire Breakage on Sensor
66
Indoor Fan Motor Check Procedure
67
Troubleshooting at the Outdoor Unit
68
Outdoor Unit Disassembly
69
DIP Switch Setting List (Outdoor Unit)
77
Check of Anomalous Operation Data with the Remote Control
78
Inverter Checker for Diagnosis of Inverter Output
80
Outdoor Unit Control Failure Diagnosis Circuit Diagram
81
Table of Contents
83
Troubleshooting Flow
83
(A) FDT, FDTC, FDU, FDUM, FDE Series
85
Operates but Does Not Cool
85
Inspect I/U (Connection of 3 Units or more Remote Controls)
95
Wait
95
E10 Excessive Number of Connected Indoor Units (more than 17 Units) by Controlling with One Remote Control
106
E36 Discharge Pipe Temperature Error
115
E48 Outdoor Fan Motor Anomaly
123
Low Pressure Error
124
E51 Inverter and Fan Motor Anomaly
126
- Suction Pipe Temperature Sensor Anomaly
  127
- Low Pressure Sensor Anomaly
  128
- Insufficient Refrigerant Amount or Detection of Service Valve Closure
  129
- Compressor Startup Failure
  130
  - Power Source System Error
    139
  - Limit Switch Anomaly
    141
  - Room Temperature Sensor Anomaly
    151
  - Low Pressure Error or Low Pressure Sensor Anomaly
    167
  - Disassembly Procedure
    175
  - Electrical Wiring
    189
  - Piping System Diagrams
    200

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Mitsubishi Heavy Industries FDT125VNAWVH Service Manual (205 pages)

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