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FDC 6 Series
Mitsubishi FDC 6 Series User Manual
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This guide is to assist
site service engineers
with commissioning
of systems and to
provide information
for maintenance and
fault finding.
Including outdoor unit (FDC 6 Series and 8 Series)
AIR CONDITIONING & HEA
T PUMP SYSTEMS
SER
VICE GUIDE
FDT 4-W
ay Cassette
FDEN Ceiling Suspended
FDKN W
all Mounted
FDR Ducted Cassette
FDU Ducted - High Static
2
Table of Contents
Default Chapter
2
Table of Contents
2
Contents
3
Indoor Unit Indicators
3
Operation Pages
3
Outline of Operation Control by Microcomputer
3
Remote Controller
3
Wireless Remote Controller
3
Wired Remote Controller
4
Automatic Operation (Only Heat Pump Type)
5
Operation Control Function by the Indoor Controller
5
Outline of Microcomputer Control Function
5
Room Temperature Control (Differential of Thermostat)
5
Dehumidifying Operation (“THERMAL DRY”)
6
Hot Spurt (Only Heat Pump Type)
6
Pattern of Operation
6
FM Control with the Heating Thermostat Turned off
7
Hot Start (Cold Draft Prevention During Heating)
7
Indoor Fan Control During Defrost Operation (Only Heat Pump Type)
7
4-Way Valve Control (1 Phase Models Only)
8
Condensate Pump Motor (DM) Control (Only FDTN (P), FDT, FDR Models)
8
Defrost Control (FDC 6 Series Only)
8
Frost Prevention During Cooling (for Indoor Heat Exchanger)
8
Automatic Restart Control
9
Compressor Inching Prevention Control
9
Overload Protection During Heating
9
Thermistor Disconnection Detection Control
9
Drain Detection
10
External Control (Remote Display)/Control of Input Signal
10
Low Voltage Guard Control
10
Refrigerant Shortage Error
10
Auto Swing Control (Excepted FDR, FDU, FDFL Models)
11
Stopping the Louvers
11
Confirmation of Connected Units
12
Display to Remote Controller
12
Indoor/Outdoor Connection Wire
12
Using 1 Remote Controller to Control Multiple Units
12
CPU Reset
13
Operation Control Function by the Wired Remote Controller
13
Parts Layout on the Remote Controller PCB
13
Power Outage Compensation Function
13
Control for Outdoor Unit Fan
14
Cooling Operation
14
Heating Operation
14
Operation Control Function by the Outdoor Controller
14
Control of Fan for Outdoor Unit for De-Icing
15
Defrost Control
15
Defrost Operation
15
Discharge Temperature Control During Cooling/Heating
15
Compressor Protecting Function
16
Cooling Overload Protection
16
Open-Phase Protection
16
Overcurrent Control
16
Compressor Motor Protection
17
Control of the Closing and Opening of the Service Valve
17
High-Pressure Protection by High-Pressure Make-Or-Break Device
17
Application Data
18
Safety Precautions
18
Evacuation Procedure
19
Maintenance Data
19
Servicing
19
Refrigerant Charging
20
Trouble Shooting for Refrigerant Circuit
20
Check Indicator Table
21
Diagnosing of Microcomputer Circuit
21
Selfdiagnosis Function
21
Table of Inspection Items Based on Error Codes
21
Error Diagnosis Procedures at the Indoor Unit Side
22
Parts Layout on the Indoor Unit PCB
22
Function of DIP Switched (SW3)
23
Function of DIP Switched (SW4, 5)
23
Function of Jumper Wires
23
Defective Indoor Unit Heat Exchanger Thermistor
24
Defective Return Air Thermistor
24
Drain Abnormality
24
Abnormality Casued by Insufficient Refrigerant
25
Heating Overload
25
Function of DIP Switched (SW4)
29
Function of DIP Switched (SW5)
29
Function of DIP Switched (SW6)
29
Parts Layout on the Outdoor Unit PCB
29
Overcurrent of the Compressor Motor
30
The Wiring (Secondary Wiring of 52C) to the Compressor Is Open
30
Defective Outdoor Unit Heat Exchanger Thermistor
31
Defective Discharge Gas Thermistor (Only Case of FDC(P)208~508 Type)
32
Defective Outdoor Temperature Thermistor
32
Failure to Open the Service Valve
33
High Pressure Error
33
Air Conditioning and Heat Pump Systems
34
4
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Mitsubishi FDC 6 Series Specifications
General
Brand
Mitsubishi
Model
FDC 6 Series
Category
Air Conditioner
Language
English
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