Table of Contents
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A I R C O N D I T I O N I N G & H E AT P U M P S Y S T E M S
S E R V I C E G U I D E
Including outdoor unit (FDC 6 Series and 8 Series)
FDT 4-Way Cassette
FDEN Ceiling Suspended
FDKN Wall Mounted
FDR Ducted Cassette
FDU Ducted - High Static
This guide is to assist
site service engineers
with commissioning
of systems and to
provide information
for maintenance and
fault finding.
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Table of Contents
Related Manuals for Mitsubishi FDC 6 Series
Summary of Contents for Mitsubishi FDC 6 Series
- Page 1 A I R C O N D I T I O N I N G & H E AT P U M P S Y S T E M S S E R V I C E G U I D E Including outdoor unit (FDC 6 Series and 8 Series) FDT 4-Way Cassette...
- Page 2 CONTENTS Operation Pages 1 - 15 Wireless Remote Controller Page 1 Wired Remote Controller Page 2 Outline of Microcomputer Control Function Page 3 Operation Control Function by the Wired Remote Controller Page 11 Operation Control Function by the Outdoor Controller Page 12 Safety Precautions Page 16...
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Page 3: Outline Of Operation Control By Microcomputer
OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER (1) Wireless remote controller Models FDTN (P), FDEN (P), FDKN (P) series (a) Remote controller Signal sender OPERATION MODE indicator Signals are sent to the air conditioner Indicates selected operation mode CAUTION from here. Cooling only air-conditioner has the display of “COOL”, “DRY”... - Page 4 Model FDEN (P) series Heavy Duty RUN CHECK ON/OFF Remote controller signal receiver RUN LAMP (GREEN) BACK UP SWITCH When the remote controller is miss- Illuminates during operation. ing or defective, this switch can start and stop the air conditioner. Use the back up switch when the bat- tery is exhausted, or when the re- CHECK LAMP (YELLOW)
- Page 5 (3) Outline of microcomputer control function (a) Operation control function by the indoor controller Automatic operation (Only heat pump type) If the Auto mode is selected on the remote control device, the selection of cooling or heating can be made automatically depending on the room temperature (and the temperature of indoor heat exchanger).
- Page 6 Dehumidifying operation (“THERMAL DRY”) The compressor, the indoor fan motor and the outdoor fan motor Operation block are operated intermittently under thermistor (ThI-A) control ac- cording to the appropriate operation block, to provide cooling op- eration for the dehumidifying. High Pattern of operation Set temp.
- Page 7 FM control with the heating thermostat turned off (For cold draft prevention) (Only heat pump type) In order to prevent a cold draft while the heating thermostat is turned off, the indoor blower is controlled in response to the temperature of the indoor heat exchanger as illustrated below. It should be noted that if SW3-4 on the indoor PCB is turned off, the indoor blower will stop so far as the temperature of the indoor heat exchanger is lower than 40˚C.
- Page 8 10) Defrost control (FDC 6 series only) Defrost operation is precisely controlled with the defrost thermostat (23DH ) and a timer.
- Page 9 13) Compressor inching prevention control Compressor 3 minutes delay control The compressor will remain in stop state for three minutes. When the compressor is stopped by thermostat, ON/OFF switch, and/or by occurrence of trouble. When the power source is turned ON, the three-minute delay timer is cancelled. Compressor 3 minutes forced operation control Compressor cannot be stopped for 3 minutes after it started.
- Page 10 17) Drain detection (Only FDTN(P), FDT, FDR models) If there is detection of a drain abnormality during cooling operation, the drain pump goes ON for 5 minutes and the compres- sor which had been running comes to a stop. Overflow detection is carried out at all times with the float switch regardless of operational mode. If an overflow is generated (or if the float switch is not yet connected or has been disconnected).
- Page 11 ¡ At shipping from factory [FDTN (P), FDEN (P), FDKN (P) models : J3 (SW5-3), FDT, FDR, FDU, FDFL models : J5 (SW5-2) ] on PCB OFF] ¡ Input signal to CnT OFF → ON [Edge input] ... Air conditioner ON ¡...
- Page 12 ¡ Keeping the louvers horizontal during heating (Only heat pump type) While HOT KEEP is displayed (during hot start operation or when the thermostat has turned off during heating operation), the louvers stay in the horizontal position to prevent cold drafts, independent of the setting of the AUTO SWING key (auto swing or stop).
- Page 13 (b) Operation control function by the wired remote controller The following is the sequence of operation for the remote controller operation mode switch. COOL HEAT AUTO (ii) CPU reset This functions when the " inspection " and " filter reset switch " on the remote controller are pushed simultaneously. It operates in the same manner as the power reset.
- Page 14 (c) Operation control function by the outdoor controller (Only FDC(P)208~508 type, FDC808, 1008 type) Control for outdoor unit fan a) Cooling Operation The speed of the fan for the outdoor unit is controlled by the temperature of the heat exchanger (Tho-R detection) and the outdoor air temperature (Tho-A).
- Page 15 Control of fan for outdoor unit for de-icing Outdoor fan If DIP switch SW5-2 on the printed circuit board for the outdoor unit is set to on, the Outdoor fan stopped operates fan on the outdoor unit which has been stopped will operate for 10 seconds at Hi speed at Hi speed every 10 minutes when the outdoor air temperature is 3 °C or less.
- Page 16 Compressor protecting function (Microcomputer and phase protection relay) Overcurrent control When a 52C secondary L -phase continues for 0.5 seconds and when it is more than the set value (detection at current sensor CT), the compressor is stopped. The compressor is restarted after a 3-minute delay if the detection current is less than 1.5 to 2A.
- Page 17 High-pressure protection by high-pressure make-or-break device (63H (Only case of FDCP208~508 and FDC808, 1008 type) If the pressure rises and 63H is operated (opened), the compressor is stopped. After a 3-minute delay, the compressor is is opened five times within 60 minutes of the first operation. e Restore restarted.
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Page 18: Application Data
APPLICATION DATA SAFETY PRECAUTIONS • Please read these “Safety Precautions” first then accurately execute the installation work. WARNING and CAUTION , those • Though the precautionary points indicated herein are divided under two headings. points which are related to the strong possibility of an installation done in error resulting in death or serious injury are listed in the WARNING section. -
Page 19: Maintenance Data
MAINTENANCE DATA 8.6.1 Servicing (1) Evacuation The evacuation is a procedure to purge impurities, such as noncondensable gas, air, moisture from the refrigerant equipment by using a vacuum pump. Since the refrigerant R22 and R407C is very insoluble in water, even a small amount of moisture left in the refrigerant equipment will freeze, causing what is called ice clogging. -
Page 20: Trouble Shooting For Refrigerant Circuit
(2) Refrigerant charging After the evacuation shown in the above, change the connection of the charge hose A to the refrigerant cylinder. Purge air from the charge hose A . First loosen the connecting portion of the charge hose at the gauge manifold side and open valve 3 for a few seconds, and then immediately retighten it after observing that gas has blown out from loosened connecting portion. -
Page 21: Diagnosing Of Microcomputer Circuit
8.6.3 Diagnosing of microcomputer circuit (1) Selfdiagnosis function (a) Indoor unit side Only case of wireless remote control model. Check indicator table Failure mode on the indoor unit indicated by flashing Yellow LED and Green LED. Indoor unit LED Failure at: Contents of the failure Yellow Green... - Page 22 (3) Error diagnosis procedures at the indoor unit side To diagnose the error, measure the voltage (AC, DC), resistance, etc. at each connector around the circuit board of indoor unit based on the inspection display or the operation state of unit (no operation of compressor or blower, no switching of 4-way valve, etc.).
- Page 23 • Function of jumper wires • Function of DIP switched (SW3) Name Function Switch Function With 1 Phase model Power off guaranteed J1(SW5-1) SW3-1 None 3 Phase model No power off guaranteed With Cooling only type With low-voltage detection J2(SW5-2) control None Heat pump type...
- Page 24 (c) Inspection method when there are fault lamps (display lamps on indoor unit). Only case of wireless remote control model Return air thermistor (Th Indoor unit heat exchanger thermistor Defective indoor unit heat exchanger thermistor Resistance temperature characteristics Indoor unit Defective indoor unit PCB Replace- ment (Defective indoor unit heat...
- Page 25 Abnormality casued by insufficient refrigerant. Are the characteristic values for Replace heat exchanger thermistor. the heat exchanger Indoor unit thermistor OK? Check Lamp (yellow) 5 time flashes Is the amount of refrigerant Charge with refrigerant. circulation good? (If refrige- rant is insufficient, the ca- Replace capillary tubes.
- Page 26 [Defective indoor unit heat exchanger thermistor] Error display : Return air thermistor (Th Indoor unit heat exchanger thermistor Resistance temperature characteristics Defective indoor unit PCB Replace- ment (Defective indoor unit heat exchanger thermistor input circuit) Are characteristics Is the indoor of indoor unit heat unit heat exchanger exchanger thermistor OK...
- Page 27 [Failure in drainage] Error display : Defective indoor unit PCB Replace- ment (Defective condensate motor output circuit) Is the angle of Is there output Is there any drain piping good. Is there for condensate motor overflow? any problem? (DM)? Repair ¡Check DM broken wire, burning, locking.
- Page 28 (4) Outdoor unit side (FDC(P)208~508 type, FDC808, 1008 type) Check Indicator Table Failure mode on the outdoor unit is indicated by flashing both Green LED (LED-G) and Red LED (LED-R) on the printed circuit board. Outdoor unit LED Failure at: Contents of the failure Green Normal/Power is supplied.
- Page 29 PCB power supply connector Parts layout on the outdoor unit PCB (Primary side) 63H1 63H1 63H2 63H2 Inspection display lamp CNA1 (LED·Red) Inspection display lamp CNA2 (LED·Green) PCB power supply connector (Secondary side) • Function of DIP switched (SW4) • Function of DIP switched (SW5) Function Function 1 Phase model...
- Page 30 (b) Inspection method when there are fault lamps (outdoor unit LED) Open phase at L phase (Primary side) Outdoor unit phase at Red LED 1 time flash Correction primary side at open Green LED Stays OFF phase Defective outdoor unit PCB Replacement Overcurrent of the compressor motor Outdoor unit...
- Page 31 The outdoor heat exchanger temperature is too high (70°C or over) Check the unit side closely Are the heat Outdoor unit Cooling, overload exchanger thermistor • Is outdoor fan motor operating? Red LED 4 time flashes operation? Charateristisc • Is the outdoor unit shortcircuited? Normal? Green LED Stays OFF...
- Page 32 Defective outdoor temperature thermistor Outdoor unit Red LED 2 time flashes Green LED 1 time flash Is the outdoor Defective outdoor unit PCB Is the outdoor temperature thermistor Replacement (Defective outdoor air temperature thermistor characteristics OK, is there temperature thermistor input connector connection no broken wire? circuit)
- Page 33 High pressure error [63H ] (Only case of FDCP208~508 type) Outdoor unit Red LED 4 time flashes Green LED 1 time flash At 63H1 opration • Is the outdoor unit fan motor operating? • Is there no shortcircuit in the outdoor unit? Did 63H operate? •...
- Page 34 AIR CONDITIONING AND HEAT PUMP SYSTEMS NOTICE The installation of this equipment must comply with all NATIONAL, STATE and LOCAL CODES. This Service Guide does not cover all installation circumstances and is meant for guidance only and therefore will not form part of any legally binding contract.