Mitsubishi FDTN208HEN-S Instruction Manual

Ceiling recessed type packaged air conditioner

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6. CEILING RECESSED TYPE

PACKAGED AIR CONDITIONER

Split system, Air to air

(

heat pump type

FDTN208HEN-S, FDTN208HEN,

FDTN258HEN-S, FDTN258HEN,

FDTN308HEN-S, FDTN308HES-S, FDTN308HEN

FDTN308HEP,

FDTN408HES-S, FDTN408HES

FDTN508HES-S, FDTN508HES,

FDT208HEN-S,

FDT308HES-S,

FDT408HES-S,

FDT508HES-S,

FDTN308HES

FDT258HEN-S, FDT308HEN-S

FDT308HEN,

FDT408HES

FDT508HES

FDTN-H

)

FDTN208HEP

FDTN258HEP

FDTN508HEM

FDT308HES

183

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Summary of Contents for Mitsubishi FDTN208HEN-S

Page 1 FDTN-H FDTN-H 6. CEILING RECESSED TYPE PACKAGED AIR CONDITIONER Split system, Air to air heat pump type FDTN208HEN-S, FDTN208HEN, FDTN208HEP FDTN258HEN-S, FDTN258HEN, FDTN258HEP FDTN308HEN-S, FDTN308HES-S, FDTN308HEN FDTN308HEP, FDTN308HES FDTN408HES-S, FDTN408HES FDTN508HES-S, FDTN508HES, FDTN508HEM FDT208HEN-S, FDT258HEN-S, FDT308HEN-S FDT308HES-S, FDT308HEN, FDT308HES FDT408HES-S,...
Page 2: Table Of Contents
FDTN-H CONTENTS 6.1 GENERAL INFORMATION ................ 185 6.1.1 Specific features ................. 185 6.1.2 How to read the model name ............. 185 6.2 SELECTION DATA..................186 6.2.1 Specifications ..................186 6.2.2 Range of usage & limitations ............. 212 6.2.3 Exterior dimensions................213 6.2.4 Exterior appearance ................
Page 3: General Information
FDTN-H GENERAL INFORMATION 6.1.1 Specific features (1) Less refrigerant charge amount due to use of double phase refrigerant flow system. The total refrigerant charge amount has been reduced by more than 50%. (2) The indoor outdoor interconnection signal wiring has been done away with. The microcomputer chip is installed in the indoor unit.
Page 4 FDTN-H Model FDTN308HEN FDTN308HEN Model Item FDTN308H FDC306HEN3 Nominal cooling capacity 7100 Nominal heating capacity 7300 Power source 1 Phase, 220/240V, 50Hz Cooling input 3.07/3.11 Running current (Cooling) 15.6/16.3 Power factor (Cooling) 89/79 Heating input 2.82/2.86 Running current (Heating) 14.5/15.2 Power factor (Heating) 88/78 Inrush current (L.R.A)
Page 5 FDTN-H Model FDTN308HES FDTN308HES Model Item FDTN308H FDC306HES3 Nominal cooling capacity ISO-T1 7100/7700 6000 ISO-T3 Nominal heating capacity ISO-T1 7300/7900 Power source 3 Phase, 380-415V 50Hz or 380V 50Hz/415V 50Hz, 380V 60Hz Cooling input 2.83/2.84/3.35 Running current (Cooling) 5.3/5.3/6.0 Power factor (Cooling) 81/75/85 Heating input 2.50/2.51/2.90...
Page 6 FDTN-H Model FDTN508HES FDTN508HES Model Item FDTN508H FDC506HES3 Nominal cooling capacity ISO-T1 12500/14000 11900 ISO-T3 Nominal heating capacity ISO-T1 12800/14400 Power source 3 Phase, 380-415V 50Hz or 380V 50Hz/415V 50Hz, 380V 60Hz Cooling input 4.87/4.87/5.83 Running current (Cooling) 10.0/10.0/11.0 Power factor (Cooling) 74/68/81 Heating input 4.49/4.51/5.41...
Page 7 FDTN-H 6.2.2 Range of usage & limitations Models FDTN208~508 (FDC208~508 type) FDT208~508 (FDC208~508 type) Models FDTN208, 258 (FDC208, 258 type) FDTN308~508 (FDC308~508 type) Item FDT208, 258 (FDC208, 258 type) FDT308~508 (FDC308~508 type) Indoor return air temperature (Upper, lower limits) Refer to the selection chart Outdoor air temperature (Upper, lower limits) Indoor unit atmosphere (behind ceiling)
Page 8 FDTN-H Models FDTN258H, 308H FDT258, 308 Unit : mm Decorative Panel (Ceiling hole size) 860~890 Fresh air (Suspension bolts pitch ) opening for ducting Exhaust air opening for ducting D→ B→ Air inlet grille Indication boad (Only case of FDTN type) VIEW A Drain hose (Accessories) Liquid piping...
Page 9 FDTN-H Models FDTN408H, 508H FDT408, 508 Unit : mm Decorative Panel (Ceiling hole size) 860~890 Fresh air (Suspension bolts pitch ) opening for ducting Exhaust air opening for ducting D→ B→ Air inlet grille Indication board (Only case of FDTN type) VIEW A Drain hose (Accessories) Liquid piping...
Page 10 FDTN-H (2) Remote controller (a) Wireless remote controller Unit: mm FILTER AUTO COOL DRY FAN HEAT ● Indication board of indoor unit FAN HI LO ° C MODE TEMP ON/OFF 20.5 (b) Wired remote controller Unit: mm Remote controller mounting dimensions Wall 0.3mm , 3cores (O.D.φ5.6)
Page 11 FDTN-H Models FDC258HEN3, 308HEN3, 308HES3 Unit: mm Liquid piping: ø9.52 (3/8") (Flare connecting) Gas piping: ø15.88 (5/8") (Flare connecting) Terminal block Liquid piping: ø9.52 (3/8") (Flare connecting) Gas piping: ø15.88 (5/8") (Flare connecting) Opening for electric wiring Opening for electric wiring Opening for piping Opening for piping and electric wiring...
Page 12 FDTN-H Models FDC408HES3, 508HES3 Unit: mm Liquid piping: ø 9.52 (3/8") (Flare connecting) Gas piping: ø 19.05 (3/4") (Flare connecting) Terminal block Liquid piping: ø 9.52 (3/8") (Flare connecting) Gas piping: ø 19.05 (3/4") (Flare connecting) Opening for electric wiring Opening for electric wiring Opening for piping...
Page 13 FDTN-H FDC306HEN3, 306HEP3, 306HES3 Models Unit: mm Anchor bolts (M10 × 4 pcs) Required space for maintenance and air flow Minimum allowable space to the obstacles Unit:mm Installation type Mark Open Open Open Notes (1) Fix the unit with anchor bolts. (2) Strong wind must not be directed to the air outlet.
Page 14 FDTN-H Models FDC406HES3, 506HES3, 506HEM3 Unit: mm Required space for maintenance and air flow Minimum allowable space to the obstacles Unit:mm Installation type Mark Open Open Open Notes (1) Fix the unit with anchor bolts. (2) Strong wind must not be directed to the air outlet.
Page 15: Exterior Appearance
FDTN-H 6.2.4 Exterior appearance (1) Indoor unit Models All models Item Panel model Remarks Type FDTN208H TN-PSC-22W-E For wireless remote controller FDTN258H~508H TN-PSC-32W-E Without swing FDT208 T-PSA-22W-E For wired remote controller FDT258~508 T-PSA-32W-E Pearl white (Decorative panel) (2) Outdoor unit Model FDC208HEN3 Models FDC258HEN3, 308HEN3, Models FDC408HES3, 508HES3...
Page 16 FDTN-H Models FDTN508HES-S, FDT508HES-S High pressure switch (63H Cooling cycle (For fan motor control) Indoor unit Outdoor unit Heating cycle 4way valve Thermistor Gas line Strainer Service valve (ø19.05) (Flare connecting) Check joint Check joint Heat exchanger Capillary tube Thermistor Oil separator Thermistor Heat exchanger...
Page 17 FDTN-H Models FDTN308HEN, 308HEP, 308HES FDT308HEN, 308HES Service valve Cooling cycle Indoor unit (Flare connecting) Heating cycle Outdoor unit Check joint High pressure switch (For fan motor control) Strainer Strainer Gas line (ø15.88) 4way valve Check joint Heat exchanger Thermistor Check joint Heat exchanger Defrost...
Page 18 FDTN-H Preset point of the protective devices Equipped FDTN308~508 Parts name Mark (FDC308~508 type only) unit FDT308~508 Thermistor OFF 68˚C (for protection over- ON 61˚C loading in heating) Indoor unit OFF 2.5˚C Thermistor (for frost prevention) ON 10˚C Thermistor OFF 135˚C (for detecting dis- Tho-D Outdoor unit...
Page 19: Specifications
FDTN-H 6.2.6 Selection chart Correct the cooling and heating capacity in accordance with the conditions as follows. The net cooling and heating capacity can be obtained in the following way. Net capacity = Capacity shown on specification × Correction factors as follows. (1) Coefficient of cooling and heating capacity in relation to temperatures Only case of ISO-T1 models (Except 308HEN-S, 308HES-S, 408HES-S, 508HES-S type) Indoor air W.B.
Page 20 FDTN-H (C) Only case of ISO-T3 and SASO models Indoor air W.B. temperature (˚CW.B.) ISO-T1 Standard condition ISO-T1 Standard condition Outdoor air W.B. temperature (˚CW.B.) Table of bypass factor Model 208 type 258 type 308 type 408 type 508 type Item 0.112 0.050...
Page 21 FDTN-H (3) Correction of cooling and heating capacity in relation to one way length of refrigerant piping It is necessary to correct the cooling and heating capacity in relation to the one way equivalent piping length between the indoor and outdoor units. 50/60Hz Equivalent piping length Heating...
Page 22 FDTN-H 6.2.7 Noise level Notes (1) The data are based on the following conditions. Ambient air temperature: Indoor unit 27˚C DB, 19˚C WB. Outdoor unit 35˚C DB. Indoor unit Outdoor unit Measured based on JIS B 8616 Measured based on JIS B 8616 Mike position: at highest noise level Mike position as below in position as below...
Page 23 FDTN-H FDC256HEP3 FDC258HEN3 FDC256HEN3 Model Model Model Noise level 57 dB (A) Noise level 52 dB (A) Noise level 57 dB (A) 1000 2000 4000 8000 1000 2000 4000 8000 1000 2000 4000 8000 Mid octave band frequency (Hz) Mid octave band frequency (Hz) Mid octave band frequency (Hz) FDC306HEN3 FDC308HEN3, 308HES3...
Page 24 FDTN-H Models FDTN308HEN-S FDT308HEN-S...
Page 25 FDTN-H Models FDTN308HES-S FDT308HES-S...
Page 26 FDTN-H Models FDTN408HES-S, 508HES-S FDT408HES-S, 508HES-S...
Page 27 FDTN-H FDTN208HEN, 208HEP, 258HEN, 258HEP, 308HEN, 308HEP Models FDT308HEN...
Page 28 FDTN-H FDTN 308HES Models FDT308HES...
Page 29 FDTN-H FDTN408HES, 508HES Models FDT408HES, 508HES...
Page 30 FDTN-H FDTN508HEM Model...
Page 31: Outline Of Operation Control By Microcomputer
FDTN-H 6.4 OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER (1) Wireless remote controller FDTN, FDEN, FDKN series Models (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” and “FAN” only. Filter reset indicator Fan speed mark is indicated when the...
Page 32 FDTN-H FDEN series Model Heavy Duty RUN CHECK ON/OFF Remote controller signal receiver RUN LAMP (GREEN) BACK UP SWITCH Illuminates during operation. When the remote controller is miss- 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 33 FDTN-H (3) Control switch Model FDF series The liquid crystal display area indicates the full contents of display for explanation. Setting temperature display This display indicates the setting Filter sign temperature. When this display is indicated, clean the air filter. Operation mode display The selected operation mode is Remote display...
Page 34 FDTN-H 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 35 FDTN-H 4) 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. -2˚C +3˚C High...
Page 36 FDTN-H 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.
Page 37 FDTN-H Condensate pump motor (DM) control (Only FDTN, FDT, FDR, FDUM models) During the cooling or Dehumidifying operation, the condensate pump motor (DM) is synchronized with the start of compressor operation. If the operation is switched from the operation stop, error stop, thermostat stop and the cooling of defrosting operation to the fan or heating operation, the drain motor continues to operate for 2 minutes after the switching.
Page 38 FDTN-H 13) Compressor inching prevention control (FDC208, 258 or 6 series only) 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 39 FDTN-H 17) Drain detection (Only FDTN, FDT, FDR, FDUM 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.
Page 40 FDTN-H ● At shipping from factory (SW5-3 [J3] on PCB OFF) ● Input signal to CnT OFF → ON [Edge input] ... Air conditioner ON ● Input signal to CnT ON → OFF [Edge input] ... Air conditioner OFF CnT input Unit A Remote controller Remote controller...
Page 41 FDTN-H ● 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 42 FDTN-H (b) Operation control function by the wired remote controller The following is the sequence of operation for the remote controller operation mode switch. COOL (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 43 FDTN-H (c) Operation control function by the outdoor controller (Only case of FDC308, 408, 508 type) Control for outdoor unit fan 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 44 FDTN-H 4-way valve control (1 phase models only) In order to maintain the pressure balance after the stop of compressor during cooling, dehumidifying and heating operation. the 4-way valve is controlled repeatedly as illustrated below. Compressor (During cooling, heating) (During cooling) 4-way valve (During heating) 50 sec.
Page 45 FDTN-H Compressor protecting function (Microcomputer and phase protection relay) Overcurrent control (i) 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 46: Application Data
FDTN-H APPLICATION DATA SAFETY PRECAUTIONS • Please read these “Safety Precautions” first then accurately execute the installation work. • Though the precautionary points indicated herein are divided under two headings. WARNING and CAUTION , those 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 47: Exterior Dimensions
All Wiring of this installation must comply with NATIONAL, STATE AND LOCAL REGULATIONS. These instructions do not cover all variations for every kind of installation circumstance. Should further information be desired or should particular problems occur, the matter should be referred to Mitsubishi Heavy Industries, Ltd. through your local distributor. WARNING BE SURE TO READ THESE INSTRUCTIONS CAREFULLY BEFORE BEGINNING INSTALLATION.
Page 48 FDTN-H (3) Hanging Refrigerant piping ¡ Arrange four sets of a hang bolt (M10 or M8) , a nut for it, a Drain plain washer and a spring washer on site. Hang bolt When there is the ceiling Washer Main body 1.
Page 49: Piping System
FDTN-H Drainage Test 1 Conduct a drainage test after completion of the electrical work. 2 During the trial, make sure that drain flows properly through the piping and that no water leaks from connections. 3 In case of a new building, conduct the test before it is furnished with the ceiling. 4 Be sure to conduct this test even when the unit is installed in the heating season.
Page 50 FDTN-H (6) Cautions for wireless remote conntroller operation As wireless remote controller is operated by infrared rays as a signal, make sure to explain to customers the following matters regarding the operating distance and protection from jamming. ¡ Operate it by directing the remote controller switch correctly to the receiver amp section. ¡...
Page 51: Installation Of Outdoor Unit
FDTN-H 1) Set necessary functions in accordance with the model of indoor 5) Couple the upper case with the lower case as it was to unit. finish up the installation. Refer to (c) for the setting of functions. 2) Couple the upper case with the lower case as they were. 3) Secure the remote controller cords on the wall or other using cord clamps.
Page 52 FDTN-H 8) When the unit is installed at the particular location as shown below, corrosion or failure may be caused. Please consult the dealer from which you purchased the air-conditioner. a) The place where corrosive gas is generated (hot spring, etc.). b) The place where wind containing salt blows (seaside area).
Page 53 FDTN-H (b) Moving The unit is heavier on the right side looking from the front of unit Heavier on Conner the right side (discharge air port side). Therefore, sufficient caution is required for pillar the person who carries the right side of unit. The person who carries the left side must hold the handle of front panle and the conner pillar with both hands.
Page 54 FDTN-H ¡ Do not let dust, chips or water enter the pipe while pipe working. ¡ The flared connection for refrigerant piping is required. Flare the pipe after inserting the flared nut into the pipe. ¡ Tighten the flared connection firmly using 2 of spanners. Comply with the following value for tightening torque of the flared nut.
Page 55 FDTN-H (d) Refrigerant charge Outdoor unit is pre-charged R-22 refrigerant at a factory as shown in Table 1. Indoor unit is pre-charged only a small amount of nitrogen gas for prevention of the air entry. Additional charge on site is required when the pipe length is longer than that of restricted value (Which is varied wirh the type of Indoor unit) as shown in Table 1.
Page 56: Electrical Wiring
FDTN-H (5) Electrical wiring ™ This air conditioning system should be notificated to supply authority before connection to power supply system. Selection of size of power supply and interconnecting wires. IMPORTANT ● Electric wiring work should be conducted only by authorized personnel. ●...
Page 57: Installation Of Outdoor Unit
FDTN-H S Models FDC206~506 series (1) Installation (a) Accessories Confirm accessories shown below are attached in the bag with this installation manual. 1) “Edging” for protection of electric wires from opening edge. (b) Selection of the place of installation Select the place of installation satisfying the following conditions and, at the same time, obtain a consent from the client or user. 1) Place where air circulates.
Page 58 FDTN-H Piping size Model FDC206 FDC256, 306 FDC406, 506 φ15.88 × 1.0 mm φ15.88 × 1.0 mm φ19.05 × 1.0 mm Gas piping φ6.35 × 0.8 mm φ9.52 × 0.8 mm φ9.52 × 0.8 mm Liquid piping • Install the removed flared nuts to the pipes to be connected, then flare the pipes. Limitations for one way piping length and vertical height difference.
Page 59 FDTN-H Example of additional charge amount calculation Calculate the additional charge amount for the model FDTN508HES when the piping length is 25 m. × 0.035 0.70 Additional charge amount (kg) Additioanl charge amount per 1 m (kg/m) Length that additional refrigerant charge is not required (m) Total length of the piping (one way) (m) Additional charge amount of refrigerant = 0.70 kg (Calculate the amount in any case.) (3) The unit is holding charge type that all of the refrigerant is charged in the outdoor unit and in the indoor unit only a...
Page 60 FDTN-H OWARNING DO NOT CONNECT THE NEUTRAL WIRE N TO L ( R ), L ( S ) OR L ( T ) PHASE. INTERCONNECTING WIRES MUST BE WIRED WITH SAME SYM- BOLS ON THE TERMINALS OF BOTH INDOOR AND OUTDOOR UNIT. INCORRECT WIRING CAUSE EQUIPMENT DAMAGE OR A FIRE.
Page 61: Maintenance Data
FDTN-H MAINTENANCE DATA 6.6.1 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 is very insoluble in water, even a small amount of moisture left in the refriger- ant equipment will freeze, causing what is called ice clogging.
Page 62: Trouble Shooting For Refrigerant Circuit
FDTN-H (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 63: Diagnosing Of Microcomputer Circuit
FDTN-H 6.6.3 Diagnosing of microcomputer circuit (1) Before starting diagnosis (a) Required tools and measurement equipment For unit disassembling Small and large Philips screw driver, Flat head screw driver, Wrench For diagnosis Tester (A general tester will do) (Diagnosis tools and equipment for refrigeration circuit should be prepared if necessary.) (2) Selfdiagnosis function (a) Indoor unit side Only case of wireless remote control model.
Page 64 FDTN-H (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 65 FDTN-H • 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...
Page 66 FDTN-H Drain abnormality Defective indoor unit PCB Replace- ment (Defective condensate motor output Indoor unit circuit) Check Lamp (yellow) 4 time flashes Is the angle of Is there output Is there any drain piping good. Is there for condensate motor overflow? any problem? (DM)?
Page 67 FDTN-H S Only case of wired remote control model [Communication error between control switch ~ Indoor unit PCB] Error display : • Normal voltage for control switch wiring (DC) Unit is normal (Intrusion of accidental Between X and Z : 10.5 ~ 10.8 V noise on the control switch Between Y and Z : 5 ~ 10.8 V cord)
Page 68 FDTN-H [Heating overload] Error display : Note (1) To see whether or not it is over- loaded, check the following: s Is the inside/outside air Is the air filter Washing clogged? temperature too high? sIs there any short circuit? sIs the refrigerant excessive? Are the heat Is the indoor exchanger thermistor...
Page 69 FDTN-H (4) Outdoor unit side (FDC308, 408, 508 model only) 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 70 FDTN-H Parts layout on the outdoor unit PCB PCB power supply connector (Primary side) 63H1 63H1 63H2 63H2 Inspection display lamp CNA1 (LED·Red) Inspection display lamp CNA2 (LED·Green) PCB power supply connector (Secondary side) • Switching by SW5 • Switching by SW6 Description Description Actual spot...
Page 71 FDTN-H (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 72 FDTN-H 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 73 FDTN-H 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 74 MEMO...

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