Manual No. ’06 . SRK-T .
CONTENTS 1 GENERAL INFORMATION.................................................................... 1 1.1 Specific features............................................................................ 1 1.2 How to read the model name ....................................................... 1 2 SELECTION DATA ................................................................................ 2.1 Specifications ................................................................................ 2.
6 MAINTENANCE DATA .......................................................................... 32 6.1 Troubleshooting procedures for electrical equipment .............. 32 6.2 Servicing ........................................................................................ 51 7 INTERFACE KIT (OPTIONAL PARTS).................................................. 52 7.1 Applicable model........................................................................... 52 7.2 List of connectable devices ..................
1 GENERAL INFORMATION 1.1 Specific features The “MITSUBISHI HEAVY INDUSTRIES, LTD” room air-conditioner: SRK series are of split and wall mounted type and the unit consists of indoor unit and outdoor unit with refrigerant precharged in factory. The indoor unit is composed of room air cooling or heating equipment with operation control switch and the outdoor unit is composed of condensing unit with compressor.
2 SELECTION DATA 2.
Model SRK25ZG-S (Indoor unit) SRC25ZG-S (Outdoor unit) (220/230/240V) Model SRK25ZG-S Item Refrigerant piping Operation data(1) Cooling capacity(1) Heating capacity(1) Power source Cooling input Running current (Cooling) Heating input Running current (Heating) Inrush current COP Sound level Cooling Power level Noise level Sound level Heating Power level Exterior dimensions Height × Width × Depth Color Net weight Refrigerant equipment Compressor type & Q’ty Motor Starting method Heat exchanger Refrige
Model SRK35ZG-S (Indoor unit) SRC35ZG-S (Outdoor unit) (220/230/240V) Model SRK35ZG-S Item Refrigerant piping Operation data(1) Cooling capacity(1) Heating capacity(1) Power source Cooling input Running current (Cooling) Heating input Running current (Heating) Inrush current COP Sound level Cooling Power level Noise level Sound level Heating Power level Exterior dimensions Height × Width × Depth Color Net weight Refrigerant equipment Compressor type & Q’ty Motor Starting method Heat exchanger Refrige
Model SRK50ZG-S (Indoor unit) SRC50ZG-S (Outdoor unit) (220/230/240V) Model SRK50ZG-S Item Refrigerant piping Operation data(1) Cooling capacity(1) Heating capacity(1) Power source Cooling input Running current (Cooling) Heating input Running current (Heating) Inrush current COP Sound level Cooling Power level Noise level Sound level Heating Power level Exterior dimensions Height × Width × Depth Color Net weight Refrigerant equipment Compressor type & Q’ty Motor Starting method Heat exchanger Refrige
2.2 Range of usage & limitations Models SRK20ZG-S, 25ZG-S, 35ZG-S Item SRK50ZG-S Indoor return air temperature (Upper, lower limits) Cooling operation : Approximately 18 to 32˚C Heating operation : Approximately 15 to 30˚C Outdoor air temperature (Upper, lower limits) Cooling operation : Approximately -15 to 46˚C Heating operation : Approximately -15 to 21˚C Max. 15m Max. 25m Max. 10m (Outdoor unit is higher) Max. 10m (Outdoor unit is lower) Max. 15m (Outdoor unit is higher) Max.
(2) Outdoor unit Models SRC20ZG-S, 25ZG-S, 35ZG-S Unit: mm 111.4 99.4 290 312.5 350 43.1 313.1 23.5 Drain holes (ø20) 50 12 104.9 14 349.5 439.1 510 780 165.1 18.9 61.9 2-16×12 Terminal block Service valve (Liquid) Flare connection ø6.35 (1/4'') 33.5 540 138.4 42.5 95.9 14 40˚ 40˚ Service valve (Gas) Flare connection ø9.52 (3/8'') Model SRC50ZG-S Drain holes 50 12 14 49.6 314 290 43.5 12 476 203.1 328 286.4 510 2-16×12 136.9 850 Terminal block 640 124 34.
2.4 Piping system Models SRK20ZG-S, 25ZG-S, 35ZG-S Indoor unit Outdoor unit Cooling cycle Heating cycle Flare connection Humidity sensor (35 type only) Service valve (Gas) Outdoor air temp. sensor Muffler Piping (Gas) ø9.52 Check joint 4 way valve Accumulator Room temp. sensor Discharge pipe temp. sensor Heat exchanger sensor Heat exchanger Heat exchanger Compressor Piping (Liquid) ø6.
2.5 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 Coefficient of cooling & Heating capacity in relation to temperature 1.3 1.2 Cooling 1.1 1.0 Heating 0.9 0.8 0.7 0.6 Cooling operation Outdoor air D.B. temperature ˚CD.
TB Y/GN BR RD WH LB Y/GN 52C-4 52C-3 J 1 1 RD WH BK F 250V 15A Y/GN RD N 3 2/N G BL Y WH BK RD FMI BK CONTROL BOX BR HEAT EXCHANGER WH BK 3 2/N 6 5 4 CNU 3 1 5 SM CNM S.IN C-2 52C F 250V 3.15A L ZNR PRINTED CIRCUIT U CNX DS BOARD - 5 10 - CNE CNG EEV CNE 20S CNB FMO CNA ~ ~ - + + CNY LM2 R.
Indoor unit Outdoor unit TB Model SRK50ZG-S POWER SOURCE 1 Phase 220/230/240V 50Hz TB Y/GN BR RD WH LB Y/GN 3 3 2/N 2/N 1 1 BK N 52C-4 Y/GN RD BK J G3 L-1 N-1 CNO.1 PWB1(MAIN) G FMO CNT AC.N AC.L BOARD Th4 CNY 11 - CNE CNG CNF Th5 RD BK - 5 AC.N P_1 N_1 CNX GR BK PRINTED CIRCUIT U BL DC-N RD GR DC-P BL CNB CNG 20S ZNR PWB3(CAPACITOR) 52C F 250V 3.
4 OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER 4.1 Operation control function by remote control switch Remote control Models All models S Operation section FAN SPEED button OPERATION MODE select button Each time the button is pushed, the indicator is switched over in turn. Each time the button pushed, the indicator is switched over in turn. ON/OFF (luminous) button HI POWER/ECONO button Press for starting operation, press again for stopping. This button changes the HIGH POWER/ ECONOMY mode.
4.2 Unit ON/OFF button When the remote control batteries become weak, or if the remote control is lost or malfunctioning, this button may be used to turn the unit on and off. (1) Operation Push the button once to place the unit in the automatic mode. Push it once more to turn the unit off. (2) Details of operation The unit will go into the automatic mode in which it automatically determines, from room temperature (as detected by sensor), whether to go into the cooling, thermal dry or heating modes.
4.5 Flap and louver control Control the flap and louver by AIRFLOW (LEFT/RIGHT) button on the wireless remote control. (UP/DOWN) and (1) Flap Each time when you press the AIRFLOW (UP/DOWN) button the mode changes as follows. (Flap stopped) (Swing) • Angle of Flap from Horizontal Remote control display COOL , DRY Approx. 10˚ Approx. 20˚ Approx. 30˚ Approx. 45˚ Approx. 60˚ HEAT Approx. 20˚ Approx. 35˚ Approx. 50˚ Approx. 60˚ Approx.
4.6 3D auto operation Control the flap and louver by 3D AUTO button on the wireless remote control. Air flow selection and air flow direction are automatically controlled, allowing the entire room to efficiently conditioned. (1) During Cooling and Heating (Including auto cooling and heating) (a) Air flow selection is determined according to room temperature and setting temperature. Operation mode At cooling At heating Air flow selection AUTO Room temp. – Setting temp. >5˚C Room temp. – Setting temp.
4.7 Timer operation (1) Comfortable timer setting (ON timer) If the timer is set at ON when the operation select switch is set at the cooling or heating, or the cooling or heating in auto mode operation is selected, the comfortable timer starts and determines the starting time of next operation based on the initial value of 15 minutes and the relationship between the room temperature at the setting time (temperature of room temperature sensor) and the setting temperature.
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4.12 Protective control function (1) Frost prevention for indoor heat exchanger (During cooling or dehumidifying) (a) Operating conditions 1) Indoor heat exchanger temperature (detected with Th2) is lower than 5ºC. 2) 10 minutes after reaching the inverter command speed except 0 rps. (b) Detail of anti-frost operation Item Indoor heat exchanger temperature Upper limit speed Indoor fan (c) 5°C or lower 2.
◆ < II > (a) Operating conditions: When the outdoor air temperature sensor (Th5) is 22ºC or lower continues for 30 seconds while outdoor speed is other than 0rps. (b) Detail of operation: 1 The lower limit of inverter command speed is set to C(D)rps and even if the speed becomes lower than C(D)rps, the speed is kept to C(D)rps. However, when the thermo becomes OFF, the speed is reduced to 0rps.
(5) Heating overload protective control (a) Operating conditions: When the unit is operating with the outdoor unit speed other than 0 rps or when the outdoor air temperature sensor (Th5) rose beyond 22ºC for 30 seconds continuously. (b) Detail of operation: 1 Taking the upper limit of control speed range at 60 rps, if the output speed obtained with the fuzzy calculation exceeds the upper limit, the upper limit value is maintained.
(7) Compressor overheat protection (a) Purpose: It is designed to prevent deterioration of oil, burnout of motor coil and other trouble resulting from the compressor overheat. (b) Detail of operation 1) Speeds are controlled with temperature detected by the sensor mounted on the discharge pipe. (Example) Fuzzy 4 rps (1) After lapse of 3 min. or over (3) After lapse of 3 min. or over (3) After lapse of 3 min.
(12) Indoor fan motor protection When the air conditioner is operating and the indoor fan motor is turned ON, if the indoor fan motor has operated at 300 rpm or under for more than 30 seconds, the unit enters first in the stop mode and then stops the entire system. (13) Serial signal transmission error protection (a) Purpose: Prevents malfunction resulting from error on the indoor ↔ outdoor signals.
5 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.
5.1 Selection of location for installation (1) Indoor unit (a) (b) (c) (d) (e) (f) (g) Where there is no obstructions to the air flow and where the cooled air can be evenly distributed. A solid place where the unit or the wall will not vibrate. A place where there will be enough space for servicing. (Where space mentioned right can be secured) Where wiring and the piping work will be easy to conduct.
5.2 Installation of indoor unit Installation of installation board Fixing of installation board Look for the inside wall structures (Intersediate support or pillar and firaly install the unit after level surface has been checked.) 450 INSTALLATION SPACE (INDOOR UNIT) (FRONT VIEW) Unit : mm Space for Indoor unit service 100 Installation board 450 202 133.5 450 102.5 585 Space for service 50 65 39.3 43.2 Space 138 206.5 102.5 200 44.5 252.2 Mating mark for level surface 44.
(3) Preparation of indoor unit (a) Mounting of connecting wires 1) Remove the lid(R). 2) Remove the wiring clamp. 3) Connect the connecting wire securely to the terminal block. Use cables for interconnection wiring to avoid loosening of the wires. CENELEC code for cables. Required field cables. H05RNR4G1.
[Drain hose changing procedures] 1. Remove the drain hose. 2. Remove the drain cap. ¡Remove the drain hose, ¡Remove it with hand or making it rotate. pliers. 3. Insert the drain cap. 4. Connect the drain hose. ¡Insert the drain cap which was removed at ¡I n s e r t t h e d r a i n h o s e proce-dure “2” securely using a hexagonal securely, makingit rotate. wrench, etc.
5.3 Installation of outdoor unit (1) Installation of outdoor unit (a) Make sure that the unit is stable in installation. Fix the unit to stable base. (b) When installing the unit at a higher place or where it could be toppled by strong winds, secure the unit firmly with foundation bolts, wire, etc. (c) Perform wiring, making wire terminal numbers conform to terminal numbers of indoor nuit terminal block. (d) Connect using ground screw located near mark.
(3) Air purge (a) Tighten all flare nuts in the pipings both indoor and outside will so as not to cause leak. (b) Connect service valve, charge hose, manifold valve and vacuum pump as is illustrated below. (c) Open manifold valve handle Lo to its full width, and perform vacuum or evacuation. Continue the vacuum or evacuation operation for 15 minutes or more and check to see that the vacuum gauge reads – 0.1 MPa (– 76 cmHg).
5.5 Test run (1) Conduct trial run after confirming that there is no gas leaks. (2) When conducting trial run set the remote control thermostat to continuous operation position. However when the power source is cut off or when the unit’s operation switch is turned off or was turned to fan operation position, the unit will not go into operation in order to protect the compressor. (3) Explain to the customer on the correct usage of the air conditioner in simple layman’s terms.
6 MAINTENANCE DATA 6.1 Troubleshooting procedures for electrical equipment (1) Cautions 1 If you are disassembling and checking an air conditioner, be sure to turn off the power before beginning. When working on indoor units, let the unit sit for about 1 minute after turning off the power before you begin work.
(4) Troubleshooting procedure (If the air conditioner runs) Confirm the contents of the customer complaint. NO The cause of the trouble can be specifically identified. Eliminate the cause of the trouble and perform an operation check. Check the self-diagnosis display. See page 34. Is an error code displayed by the self-diagnosis function? YES NO Using the Service Mode, access the self-diagnosis displays generated in the past. See pages 35~38.
(5) Self-diagnosis table When this air conditioner performs an emergency stop, the reason why the emergency stop occurred is displayed by the flashing of display lights. If the air conditioner is operated using the remote control 3 minutes or more after the emergency stop, the trouble display stops and the air conditioner resumes operation.
(6) Service mode (Trouble mode access function) This air conditioner is capable of recording error displays and protective stops (service data) which have occurred in the past. If self-diagnosis displays cannot be confirmed, it is possible to get a grasp of the conditions at the time trouble occurred by checking these service data.
*3: To count the number of flashes in the service mode, count the number of flashes after the light lights up for 1.5 second initially (start signal). (The time that the light lights up for 1.5 second (start signal) is not counted in the number of flashes.) • In the case of current safe (heating CT1) (example: stop code “32”) The RUN light (10’s digit) flashes 3 times and the TIMER light (1’s digit) flashes 2 times.
2 Stop data Remote control setting Operation switching Displayed data Fan speed Temperature switching setting Cooling LO 21°C Displays the reason for the stop (stop code) the previous time when the air conditioner was stopped by protective stop control. 22°C Displays the reason for the stop (stop code) 2 times previous when the air conditioner was stopped by protective stop control.
Number of flashes when in service mode Stop code Error content or RUN TIMER light Error code light Minor category Major category (10’s digit) (1’s digit) 4 time flash 5 time flash 6 time flash 7 time flash Occurrence conditions Error Auto display recovery Cooling overload 1 (outdoor temperature: 36~40ºC) Overcharge Compressor lock Overload operation When there is a current safe stop in overload 1 mode during cooling operation.
Note (1) The number of flashes when in the Service Mode do not include the 1.5 second period when the lights light up at first (starting signal). (See the example shown below.) • In the case of current safe (heating CT1) (example: stop code “32”) The RUN light (10’s digit) flashes 3 times and the TIMER light (1’s digit) flashes 2 times. 3 × 10 + 2 × 1 = 32 → From the table, read the instructions for error code 32, “Current safe (heating CT1). 1.5 sec. RUN light (10’s digit) ON OFF 0.5 sec. 0.5 sec.
(e) Room temperature sensor temperature, indoor heat exchanger sensor temperature, outdoor air temperature sensor temperature, outdoor heat exchanger sensor temperature table Units: °C TIMER light (1’s digit) RUN light (10’s digit) 0 1 2 3 4 5 6 7 8 9 6 -60 -61 -62 -63 -64 5 -50 -51 -52 -53 -54 -55 -56 -57 -58 -59 4 -40 -41 -42 3 -30 -31 -32 -43 -44 -45 -46 -47 -48 -49 -33 -34 -35 -36 -37 -38 -39 2 -20 -21 1 -10 -11 -22 -23 -24 -25 -26 -27 -28 -
(f) Discharge pipe temperature table Units: °C TIMER light (1’s digit) RUN light (10’s digit) 0 1 2 3 4 5 6 7 8 9 3 -60 -62 -64 2 -40 -42 -44 -46 -48 -50 -52 -54 -56 -58 1 -20 -22 -24 -26 -28 -30 -32 -34 -36 -38 -2 -4 -6 -8 -10 -12 -14 -16 -18 Buzzer sound (minus) Yes (sounds for 0.
Service data record form Model Customer Date of investigation Machine name Content of complaint Display results Remote control settings Temperature setting Operation switching Fan speed switching MED Cooling Heating Cooling 22 Heating Cooling 23 Heating Cooling AUTO Indoor heat exchanger sensor temperature on previous occasion. Heating Cooling 25 Outdoor air temperature sensor temperature on previous occasion. HI Outdoor heat exchanger sensor temperature on previous occasion.
(7) Inspection procedures corresponding to detail of trouble [Broken sensor wire, connector poor connection] Sensor error Is connector connection good? NO Correct connection. YES NO Is sensor resistance value good? Replace sensor. YES Replace PCB. ◆ Sensor temperature characteristics (Room temp., indoor unit heat exchanger temp., outdoor unit heat exchanger temp., outdoor air temp.
[Open phase on compressor output terminal, compressor lock] Current cut Does current cut operate when operating inverter with compressor wire disconnected? NO Defective inverter YES Is output voltage applied to all 3 phases of power transistor? NO Defective inverter YES NO Secure space for suction and blow out. Is there any shortcircuit? YES ¡ Check compressor wiring visually. Inspect compressor. If check results are normal, compressor is locked. ¡ Check insulation resistance.
[Gas shortage, defective discharge pipe sensor] Over heat of compressor Is discharge pipe sensor resistance value good? NO (page 43) Connector connection check, resistance value check, replacement of discharge pipe sensor YES Is sufficient quantity of refrigerant circulated? NO Does trouble persist after charging gas? NO Check if there are any places where gas is leaking. YES YES Clogged capillary tube or strainer, defective EEV, etc.
[Defective fan motor, connector poor connection, defective PCB] Outdoor fan motor error Is connector connection good? NO Correct connector connection YES * Disconnect the fan motor connector, then investigate the DC fan motor and outdoor unit circuit board separately.
(b) Outdoor unit Phenomenon Sensor Operation mode Heat exchanger sensor Cooling System can be operated normally. System can be operated normally. Heating Defrosting is not performed. Defrosting is performed for 10 minutes at approx. 45 minutes. Outdoor air temperature sensor Cooling System can be operated normally. System can be operated normally. Heating Defrosting is not operated. Defrosting is performed for 10 minutes at approx. 45 minutes.
(10) How to make sure of remote control (1) Is remote control normal? NO Remote control defects YES Replace the display. Again pushing operating switch Is the unit operable with remote control? Operating the unit? YES Abnormality is not found. Normal NO Defective remote control NO Does unit ON/OFF button operates? Operating the unit. YES Note (1) Check method of remote control (a) Press the reset switch of the remote control.
- 49 - CAUTION - HIGH VOLTAGE Red White Yellow/Green WH Y/GN Black RD BK Color symbol ◆ Inspection of serial signal Check the voltage between terminals 2~3on the terminal block.(It is normal if the needle swing in the range of DC 0~Approx.12V) ◆ Inspection of input to PCB ¡ Check the voltage between terminals 1~2 on the terminal block. (It is normal if AC 220/230/240V is detected.
- 50 - BK 1 2/N WH RD 3 Y/GN AC.N GR AC.L BL AC.N RD DC-P 20S PWB1 (MAIN ) CNT CNB FMo P_1 N_1 DC-N BK [Use a tester with a needle indicator for the inspection. (Do not use a digital tester. Check in the AC 300 volt range.)] (1) If there is a self-diagnosis display, inspect the compressor system (burns, wiring mistakes, etc.) If no problems are found, check the output of the power transistor. (2) Output inspection procedure Disconnect the terminals for the compresseor.
6.2 Servicing (1) Evacuation The evacuation is an procedure to purge impurities......noncondensable gas, air, moisture from the refrigerant equipment by using a vacuum pump. Since the refrigerant R410A is very insoluble in water, even a small amount of moisture left in the refrigerant equipment will freeze, causing what is called water clogging. ¡ Evacuation procedure (a) Check to ensure that there is no internal pressure in the unit.
7 INTERFACE KIT (OPTIONAL PARTS) 7.1 Applicable model Name Type Interface kit SC-BIK-E SRK20ZG-S, SRK25ZG-S SRK35ZG-S, SRK50ZG-S 7.2 List of connectable devices Name Wired remote control Super link adapter Center console Type RC-E1R SC-AD-ER SC-SLA1-ER, SC-SLA2A-ER, SC-SLA3-ER 18.2 83.5 135 1300 7.3 Exterior dimensions 120 29 7.
q Wired remote control system SC-BIK-E RC-E1R Interface kit Room air conditinoer Wired remote control w Control of multiple units with a remote control Center console Super link SC-AD-ER adapter Interface kit SC-BIK-E SC-AD-ER SC-AD-ER SC-AD-ER SC-BIK-E SC-BIK-E SC-BIK-E Control contents Use Using the wired remote control system, users can run and stop the unit, switch operations, adjust the temperature, fan speed and air flow direction (up or down), and control timer operation .
7.6 Installation of interface kit Accessories included in package Please check to make sure all the accessories have been included. Part name Quantity Indoor unit connection cable (total cable length: 2 m) 1 Wood screws (for mounting the interface: ø4 × 25) 2 Tapping screws (for mounting the clamp and interface mounting bracket) 3 Interface mounting bracket 1 Clamp (for the indoor unit) 1 Connecting the interface and indoor unit q Remove the air inlet panel, lid and front panel.
Connecting the interface and the indoor unit u Remove the upper case of the interface. • Take out the 2 screws in the interface case. i Install the indoor unit’s connection cables in the interface. • Connect the connectors of the indoor unit connection cables to the connectors on the interface’s circuit board. (4 places) o Fasten the indoor unit connection cables using clamps. • Cables can be brought in from the top or from the back. • Use side cutters, etc.
Wired remote control connection Please see the instructions in the wired remote control’s manual concerning connections to the wired remote control. 1 Cut jumper wire “J2” on the circuit board. Caution: Both the wired remote control and the wireless remote control supplied with the indoor unit cannot be used together. Jumper wire (J2) 2 Connect the interface and remote control. The terminals have polarity, so be sure to connect the wires to the corresponding terminal on each end.
Super link adapter connection See the super link adapter’s manual concerning connections to the super link adapter. 1Cut jumper wire (J2) on the circuit board. Caution: This device cannot be used together with the wireless remote control which is supplied with the indoor unit.
Interface installation Install the interface so that the connection cable can reach the indoor unit (approximately 1.3 m). If the connection cable is extended, operation will be faulty, so do not extend the cable. Fasten the unit to a wall, pillar or similar location. Wiring inlet Use a side cutter or similar tool to open the thin knockouts in the case for running wires.
7.7 Wired remote control (Optional parts) The figure below shows the remote control with the cover opened. Note that all the items that may be displayed in the liquid crystal display area are shown in the figure for the sake of explanation. Characters displayed with dots in the liquid crystal display area are abbreviated. Note (1) The SRK models don't support the switches and functions displayed in【 】 . Pull the cover downward to open it.
The length of each wire that should be left after a sheath is removed is as follows: 7.8 Installation of wired remote control (Optional parts) (1) Selection of installation location Avoid the following locations (a) Direct sunlight. (b) Close to heating device. (c) Highly humid or water splashing area. (d) Uneven surface. (2) Installation procedure (a) Exposed fiting 1) Open the remote control cover and unscrew the screw located beneath the switch.
7.9 Setting functions using the wired remote control (1) The default settings of this unit's functions are as follows: If you want to charge a setting, follow the procedure found in the installation manual and set to your desired setting. For the method of setting, please refer to the installation manual of a remote control unit.
(2) Function setting method Operating guide message Function description: B , Settting: C (a) Stop the air conditioner Function number: A (b) Press the SET and MODE buttons simultaneously for 3 seconds or longer. The screen display will be switched as follows: “ Confirm Button SELECT ITEM” “ AUTO RUN SET SET" Finish Button “FUNCTION SET ” Start Button FUNCTION SET Selector button (c) Press the SET button. The unit will enter the function setting mode.
When “I/U FUNCTION ” is selected. 1 The screen display will be switched as follows: “ SET” I/U SELECT” “ “I/U No.00” (blinking) I/U No.00 or button. 2 Press either Select the indoor unit number that you want to change settings. If only one indoor unit is connected, the indoor unit number will not charge, so please proceed to Step 3. If “ALL I/U ” is selected while indoor group control is in effect, you can set all units to the same settings. 3 Press the SET button.
(3) Changing the remote control set temperature range (a) It is possible to change the set temperature range using the remote control. 1) The upper and lower set temperature limits can be set from the remote control. Upper limit value setting: Effective during heating. The temperature can be set within a range of 20~30ºC. Lower limit value setting: Effective when running in modes other than the heating mode (AUTO, COOL, FAN, DRY): The temperature can be set within a range of 18~26ºC.
• If the RESET button is pressed during a setting operation, the display returns to the previously displayed setting screen. However, settings which have not been fixed become invalid, so exercise caution. * If “NO DISP CHANGE” is selected in No. 12, “TEMP RANGE SET” of the remote control’s functions, of the function setting modes, the remote control’s display does not change even if the temperature range has been changed. (Example) If the upper limit is set at 28°C Function No.
(3) Installation (a) Accessories Printed circuit board Metal box Metal cover Insulating rubber sheet Pan head screw Locking support Band ø4 × 8r 2 units for fixing the printed circuit board for binding wires, 5 pieces made of nylon Binding band 4 units (b) Metal box dimension 85 35 40 30 70 100 90 5 22.5 2-ø6 (c) Installation Outline 1) Secure the installing board to the metal box with the locking supports.
7.11 Operation permission/prohibition control The air conditioner operation is controlled by releasing the jumper wire (J3) on the interface kit board and inputting the external signal into the CnT. (1) The operation mode is switched over between Permission and Prohibition by releasing the jumper wire (J3) on the interface kit control board.
7.12 External control (remote display)/control of input signal (1) External control (remote display) output Following output connectors (CNT) are provided on the printed circuit board of interface kit. • Operation output: Power to engage DC 12V relay (provided by the customer) is outputted during operation. • Heating output: Power to engage DC 12V relay (provided by the customer) is outputted during the heating operation.
8 REFRIGERANT PIPING INSTALLATION/SERVICING MANUAL FOR AIR CONDITIONERS USING R410A (These materials are extracted from document issued by The Japan Refrigeration and Air Conditioning Industry Association) 8.1 Outline 8.1.
(3) Lubricating oils for R410A As the lubricating oils for R22, mineral oils, alkylbenze synthetic oils, etc. have so far been used. As R410A features less solubility with these conventional lubricating oils such as mineral oils, the lubricating oils tend to stay within the refrigeration cycle. As the lubricating oils highly soluble with R410A, ester, ethereal and other synthetic oils are available.
(2) Joints For copper pipes, flare joints or socket joints are used. Prior to use, be sure to remove all contaminants. a) Flare joints Flare joints used to connect the copper pipes cannot be used for pipings whose outer diameter exceeds 20 mm. In such a case, socket joints can be used. Sizes of flare pipe ends, flare joint ends and flare nuts are as shown in Tables 5~8 (see on page 72, 73) below. Also, union, half union, Tee-type union and elbow-type union shapes are generally used (see Fig 1).
d) Flare processing øD Make certain that a clamp bar and copper pipe have been cleaned. A By means of the clamp bar, perform the flare processing correctly. Use either a flare tool for R410A or conventional flare tool. Flare processing dimensions differ according to the type of flare tool. Be careful. When using a conventional flare tool, be sure to secure “dimension A” by using a gage for size adjustment. Fig.3 Flare processing dimensions Table 5.
Table 8. Flare and flare nut dimensions for R22 (2) [unit: mm] Dimension (mm) Nominal diameter Outer diameter (mm) Thickness (mm) 1/4 6.35 0.8 9.0 9.2 6.5 13 17 3/8 9.52 0.8 13.0 13.5 9.7 20 22 1/2 12.70 0.8 16.2 16.0 12.9 20 24 5/8 15.88 1.0 19.4 19.0 16.0 23 27 A B C D Flare nut width Flare connecting procedures and precautions a) Make sure that the flare and union portions do not have any scar or dust, etc.
(2) Identification a) Piping set A copper pipe as piping set for R410A must have a thickness as stated in Table 3 (see on page 70), and, as shown in Tables 5 and 6 (see on page 72), it also differs from R22 in flare processing and flare nut dimensions. So, it is necessary to choose a piping set suitable for R410A. b) Copper pipe with insulation Before using a copper pipe with insulation, make sure that it has a thickness designated for R410A.
(3) Flux a) Reasons for the use of flux • By removing the oxide film and any foreign matter on the metal surface, it assists the flow of brazing filler. • In the brazing process, it prevents the metal surface from being oxidized. • By reducing the brazing filler’s surface tension, the brazing filler adheres better to the treated metal. b) Properties required for flux • Temperature at which flux is active coincides with the brazing temperature.
Reducing valve Nitrogen gas M Flow meter Stop valve From the nitrogen cylinder Piping Nitrogen gas Rubber plug for sealing Fig.5 Prevention of oxidation during brazing * Cautions during brazing 1 General cautions 1) The brazing strength should be high as required. 2) After operation, airtightness should be kept under a pressurized condition. 3) During brazing do not allow component materials to become damaged due to overheating.
(1) Tools exclusive for R410A a) Gauge manifold • As R410A is characterized by high pressure, conventional tools cannot be used. Table 11. Differences between conventional high/low pressure gauges and those for R410A Conventional gauges Gauges exclusive for R410A High pressure gauge (red) -0.1~3.5MPa -76 cmHg~35 kgf/cm2 -0.1~5.3MPa -76 cmHg~53 kgf/cm2 Compound gauge (blue) -0.1~1.7MPa -76 cmHg~17 kgf/cm2 -0.1~3.
e) Flare tool (clutch type) • A flare tool for R410A is provided with a large clamp bar receiving hole so that the projection of the copper pipe from the clamp bar can be set at 0~0.5 mm in flare processing, and also features higher spring strength for increased expansion pipe torque. This flare tool can also be used for R22 copper pipe. f) Gauge for projection adjustment (used when flare processing is made by using conventional flare tool [clutch type]) • A gauge 1.
8.3.2 New installation work (when using new refrigerant piping) (1) Air purge by vacuum pump and gas leakage inspection (see Fig. 6) a) Connect the charge hose to the outdoor unit. 1 b) Connect the charge hose to the vacuum pump adapter. 2 At this time, keep the control valves in the fully closed position. 3 4 c) Place the handle Lo in the fully opened position 5, and turn on the vacuum pump’s power switch.
f) After charging liquid refrigerant into the air conditioner by closing the charging valve, stop operation by fully closing the gauge manifold’s valve Lo. 2 5 g) Quickly remove the charge hose from the service port. 6 When stopped halfway, refrigerant being cycled will be released. h) After securing the caps on the service port and control valve, check the caps’ periphery to see if there is any gas leakage.
8.3.6 Refrigerant recharging at servicing When it becomes necessary to recharge refrigerant, charge the specified amount of new refrigerant according to the following steps. (For details, see the instruction manual prepared by the equipment manufacturer) 1) Connect the charge hose to the outdoor unit’s service port. 2) Connect the charge hose to the vacuum pump adapter. At this time, keep the control valves in the fully opened position.
(4) (5) Recovering procedures a) According to the instructions for handling the refrigerant recovering equipment (described in the attached instruction manual), operate the equipment to recover refrigerant. b) During the operation, take care of the following cautions. 1 Ascertain that the refrigerant recovering equipment is running as required and always monitor the state of operation so that adequate steps can be taken in an emergency. 2 During the operation, remain at work site to ensure safety.
b) Charge hose (pressure resistant hose for fluorocarbon) and packing • It is 1/4B in thickness and available in various lengths, etc. • Use a hose whose pressure resisting performance is higher than 5.2 MPa (52 kg/cm2G). • Generally, a setting fixture is provided only on one end. (4) Gauge manifold Hose packing • The most important service tool for refrigeration and air conditioner. Setting fixture • Widely used when charging/recovering R410A while checking gas pressure.
INVERTER WALL MOUNTED TYPE ROOM AIR-CONDITIONER Air-Conditioning & Refrigeration Systems Headquarters 16-5, 2-chome, Kounan, Minato-ku, Tokyo, 108-8215, Japan Fax : (03) 6716-5926 No.116(1.
