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 2.1 Specifications ........................................................
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 equipment with operation control switch and the outdoor unit is composed of condensing unit with compressor.
2. SELECTION DATA 2.
Model SRK71CF-BN (Indoor unit) SRC71CF-BN (Outdoor unit) (220/240V) Model SRK71CF-BN Item ISO-T3 (SASO) ISO-T1 (JIS) Cooling capacity Cooling power input Energy efficiency ratio Rating current Cooling capacity Cooling power input Energy efficiency ratio Rating current Power source Noise level Cooling Sound level Exterior dimensions Height × Width × Depth Color Net weight Refrigerant equipment Compressor type & Q’ty Motor Starting method Heat exchanger Refrigerant control Refrigerant piping Refriger
Model SRK52CF-BP (Indoor unit) SRC52CF-BP (Outdoor unit) (220V) Model SRK52CF-BP Item ISO-T1 (JIS) Cooling capacity ISO-T3 (SASO) Cooling power input Energy efficiency ratio Rating current Cooling capacity Cooling power input Energy efficiency ratio Rating current Power source Noise level Cooling Sound level Exterior dimensions Height × Width × Depth Color Net weight Refrigerant equipment Compressor type & Q’ty Motor Starting method Heat exchanger Refrigerant control Refrigerant piping Refrigerant
Model SRK71CF-BP (Indoor unit) SRC71CF-BP (Outdoor unit) (220V) Model SRK71CF-BP Item Refrigerant piping ISO-T3 (SASO) ISO-T1 (JIS) Cooling capacity Cooling power input Energy efficiency ratio Rating current Cooling capacity Cooling power input Energy efficiency ratio Rating current Power source Noise level Cooling Sound level Exterior dimensions Height × Width × Depth Color Net weight Refrigerant equipment Compressor type & Q’ty Motor Starting method Heat exchanger Refrigerant control Refrigerant(3
2.2 Range of usage & limitations Models All models Item Indoor return air temperature (Upper, lower limits) Cooling operation: Approximately 21 to 32 °C Outdoor air temperature (Upper, lower limits) Cooling operation: Approximately 21 to 54 °C Refrigerant line (one way) length Max. 25m Vertical height difference between outdoor unit and indoor unit Max. 15m Rating ± 10% Power source voltage Voltage at starting Min. 85% of rating Frequency of ON-OFF cycle Max.
(2) Outdoor unit Models SRC52CF-BN, 52CF-BP 50 Drain holes 12 Unit: mm 14 49.6 314 290 43.5 12 328 286.4 476 203.1 510 Elogated hole (2-12 x16) 136.9 850 Terminal block 640 124 34.6 42.7 Ground terminal 100.3 15 20˚ 20˚ Service valve (Liquid) ø6.35 (1/4'') Service valve (Gas) ø15.88 (5/8'') Models SRC71CF-BN, 71CF-BP Unit: mm 223 310 60 15 2- R7 61 150 Drain holes 580 27 150 880 418 19 61 380 340 47.5 .5 32 88 Terminal block Service valve (Liquid) 24 30° 48.
2.4 Piping system Models SRK52CF-BN, 52CF-BP Indoor unit Outdoor unit Flare connecting Piping (Gas) ø15.88 Cooling cycle Outdoor air temp. sensor Service valve (Gas) Muffler* Check joint Heat exchanger sensor Humidity sensor Room temp. sensor Heat exchanger Discharge pipe temp. sensor Heat exchanger sensor Heat exchanger Compressor Piping (Liquid) ø6.
2.5 Selection chart Correct the cooling capacity in accordance with the conditions as follows. The net cooling capacity can be obtained in the following way. Net capacity = Capacity shown on specification ✕ Correction factors as follows. (1) Coefficient of cooling capacity in relation to temperatures S SRK52CF-BN, 52CF-BP Coefficient of cooling capacity in relation to temperature 1.3 1.2 Cooling 1.1 1.0 0.9 0.8 0.7 Outdoor air D.B. temperature °C D.B. Cooling operation 0.
HA JEM-A S/N R/L 1 L G Power Source 1 Phase 220-240V 50Hz J J BK RD WH N RD Y/GN BK WH 1 2/N N F 250V 3.15A CC CM2 WH Option ZNR XR1 XR2 XR3 XR4 CNT CM1 BK F 250V 3.15A 52X1 Y 10 - CNX CNM CNE CNG ~ ~ - + DS 11 9 CNB 52X3 RD WH BK - CNY 52X4 CNF BL XYZ Parts name Compressor motor Fuse Fan motor(Indoor) Fan motor(Outdoor) Flap motor Louver motor Room temp.sensor Heat exch.
Option HA JEM-A XR1 XR2 XR3 XR4 S/N R/L Y/GN G 2/N N 1 L J N F 250V 3.15A CC CM1 BK F 250V 3.15A 52X1 Y CNY 11 - CNG CNF CNB ~ - + DS 11 9 52X3 RD WH BK CNE ~ XY Z Wireless R-AMP Black Blue Orange Red Yellow White Yellow/Green Green Th3 1 5 Terminal block To wired remote control (Option) CNE Parts name Compressor motor Fuse Fan motor(Indoor) Fan motor(Outdoor) Flap motor Louver motor Room temp.sensor Heat exch.
HA JEM-A S/N R/L Y/GN G Power Source 1 Phase 220V 60Hz 3 2/N N 1 L J J BK RD RD Y/GN 1 BK FMI 6 5 4 3 1 CNU WH BL Y WH BK RD Y/GN RD 3 WH 2/N BK TB WH Heat exchanger TB N F 250V 3.15A CC CM2 WH Option ZNR XR1 XR2 XR3 XR4 W F 250V 3.15A 52X1 Y XR5 CNY 12 - CNX CNM CNE CNG ~ - + DS 11 9 52X3 52X4 BL XYZ Parts name Compressor motor Fuse Fan motor(Indoor) Fan motor(Outdoor) Flap motor Louver motor Room temp.sensor Heat exch.
Option HA JEM-A XR1 XR2 XR3 XR4 S/N R/L Y/GN G 2/N N 1 L J N F 250V 3.15A CC CM1 BK F 250V 3.15A 52X1 Y CNY 13 - CNG CNF CNB ~ - + DS 11 9 52X3 RD WH BK CNE ~ XY Z Wireless R-AMP Black Blue Orange Red Yellow White Yellow/Green Green Th3 1 5 Terminal block To wired remote control (Option) CNE Parts name Compressor motor Fuse Fan motor(Indoor) Fan motor(Outdoor) Flap motor Louver motor Room temp.sensor Heat exch.
4. OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER 4.1 Operation control function by remote control switch (1) Wireless remote control Models All models S Operation section FAN SPEED button Each time the button is pushed, the cator is switched over in turn. OPERATION MODE select button indi- Each time the button is pushed, the cator is switched over in turn. indi- ON/OFF (luminous) button HI POWER/ECONO button Press for starting operation, press again for stopping.
(2) 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.
(3) Unit indication section RUN light (green) Models All models • Illuminates during operation. TIMER light (yellow) Illuminates during TIMER operation. HI POWER light (green) Illuminates during HIGH POWER operation. ECONOMY light (orange) Illuminates during ECONOMY operation. 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.
4.4 Custom cord switching procedure If two wireless remote controls are installed in one room, in order to prevent wrong EXTERNAL INPUT WIRED REMOCON operation due to mixed signals, please modify the printed circuit board in the indoor OPE PERMISSION CUSTOM unit’s control box and the remote control using the following procedure. Be sure to modify Jumper wire (J4) AUTO RESTART LO TEMP both boards. If only one board is modified, receiving (and operation) cannot be done.
4.6 Comfortable timer setting If the timer is set at ON when the operation select switch is set at the cooling, or the cooling 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. (Max. 60 minutes) Operation mode Operation start time correction value (Min.
4.8 Outline of cooling operation (1) Operation of major functional components Item When the compressor command is OFF When the compressor command is ON When the compressor goes OFF due to an anomalous stop.
4.9 Outline of dehumidifying operation (1) Choose the appropriate operation block area by the difference between room temperature and thermostat setting temperature as shown below. ¡ Operation block area D Block C Block –2 Room temp. B Block A Block 0 +3 – Setting temp.(deg) (2) Start up operation C.D Block A.
4.10 Outline of automatic operation (1) Determination of operation mode The unit checks the room temperature and the outdoor air temperature after operating the indoor and outdoor blowers for 20 seconds, determines the operation mode and the room temperature setting correction value, and then begins in the automatic Room temperature (˚C) operation. 27.5 Cooling 25.5 Dehumidifying 19.
4.12 Outline of fan operation (1) Operation of major functional components Fan speed switching Functional components 52C High power HIGH MED LOW ECONO Speed 6 Speed 4 Speed 2 OFF Indoor fan motor (2) AUTO Speed 9 Speed 8 Speed 8 Outdoor fan motor OFF Flap and louver Depend on the flap and louver control HIGH POWER operation (“HI POWER” button on the remote control : ON) The following operation is performed for 15 minutes without relation to the set temperature or fan speed setting.
4.14 Stop mode Functional components Operation When the complete stop command given, when there is and abnormal stoppage command Cooling,cooling oriented dehumidifying When stoppage occurs due to thermostat operation, switching operations and protective function operations Cooling,cooling oriented dehumidifying 2 min.55 sec. 3 min. ON Compressor OFF 1 min. ON 1 min. Outdoor unit fun OFF ON Indoor unit fun OFF Fully closed Flap Set location 2 min.55 sec.
4.15 External control (remote display)/control of input signal Make sure to connect the wired remote control unit. Control of input signal is not available without the wired remote control unit. (1) External control (remote display) output Following output connectors (CNT) are provided on the printed circuit board of indoor unit. (a) Operation output: Power to engage DC 12V relay (provided by the customer) is outputted during operation.
4.16 Operation permission/prohibition control The air conditioner operation is controlled by releasing the jumper wire (J3) on the indoor control 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 indoor control board.
(2) Dew condensation prevention control [Cooling (including automatic), cooling oriented dehumidifying operation] (a) Operating condition: When the following conditions are met after 5 minutes or more of continuous operation after operation starts. Prevention control • The humidity sensor value is 68% or higher (b) Operation contents Reset 1) Command of the electronic expansion valve.
(7) High-pressure control The outdoor heat exchanger temperature sensor detection temperature controls the compressor. ¡ When the outdoor heat exchanger temperature is > = (52 type: 74˚C, 71 type: 73˚C) Compressor ON or OFF OFF 68 52 type: 74 71 type: 73 Outdoor heat exchanger temp. (˚C) (8) Serial signal transmission error protection (a) Purpose: Prevents malfunction resulting from error on the indoor ↔ outdoor signals.
4.18 List of indoor unit jumper selections Jumper No.
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) Where there is no obstructions to the air flow and where the cooled air can be evenly distributed. (b) A solid place where the unit or the wall will not vibrate. (c) A place where there will be enough space for servicing. (Where 6.5 cm Right side 10 cm Left side space mentioned right can be secured) 5 cm (d) Where wiring and the piping work will be easy to conduct.
5.2 Installation of indoor unit (1) Installation of installation board (a) 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.) 610 450 INSTALLATION SPACE (INDOOR UNIT) (FRONT VIEW) Unit: mm Mating mark for level surface Adjustment of the installation board in the horizontal direction is to be conducted with four screws in a temporary tightened state.
(3) Preparation of indoor unit (a) Mounting of connecting wires 1) Open the air inlet panel. 2) Remove the lid. 3) Remove the wiring clamp. 4) 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 procedure “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 unit 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.
5.7 Installation of wired remote control and super link adapter (SC-AD-ER) (Optional parts) (d) (1) Modifying the indoor unit’s printed circuit board (a) Remove the air inlet panel (Refer to the installa tion directions). (b) Remove the front panel (Refer to the installation directions). (c) Remove the control box • Remove the screw and the latch, and open the control lid. Cut the jumper attached on the board. • Remove the upper box. Remove the screw, the latch and the band.
(2) Installation of wired remote control (Optional parts) (a) Selection of installation location Avoid the following locations 1) Direct sunlight. 2) Close to heating device. 3) Highly humid or water splashing area. 4) Uneven surface. (b) Installation procedure 1) Exposed fiting a) Open the remote control case. 2) Recessed fitting a) The Electrical box and remote control (shield wire must be use in case of extension) are first embedded.
(3) Setting functions using the wired remote control (a) 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.
(b) Function setting method 1) Stop the air conditioner 2) Press the SET and MODE buttons simultaneously for 3 seconds or longer. The screen display will be switched as follows: “ SELECT ITEM” “ AUTO RUN SET SET" “FUNCTION SET ” FUNCTION SET 3) 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: “ I/U SELECT” “ SET” “I/U No.00” (blinking) I/U No.00 2 Press either or button. 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.
(d) Changing the remote control’s temperature setting range 1) The temperature setting range of the remote control can be changed. Through remote control button operations, the upper limit and lower limit set temperature values can be changed individually. During heating operation, the changed upper limit value becomes valid and at times other than during heating operation, (during cooling, dehumidification, auto and fan operation), the changed lower limit value becomes valid.
(4) SUPER LINK ADAPTER (SC-AD-ER) (a) Functions 1) Transmits the settings from the Super link option to the indoor units. 2) Returns the priority indoor unit data in response to a data request from the Super link option. 3) Inspects the error status of connected indoor units and transmits the inspection codes to the Super link option. 4) A maximum of 16 units can be controlled (if in the same operation mode).
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. YES Eliminate the cause of the trouble and perform an operation check. Check the self-diagnosis display. See page 46. Identify the faulty component by using the check procedure corresponding to the content of the trouble. Replace the faulty component, then perform an operation check.
(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) 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 (Discharge pipe temp., outdoor unit heat exchanger temp.) ◆ Sensor temperature characteristics (Room temp., indoor unit heat exchanger temp., outdoor air temp.
[Gas shortage, defective discharge pipe sensor] Over heat of compressor Is discharge pipe sensor resistance value good? NO (page 47) 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.
[Compressor malfunction of insufficient gas (refrigerant)] Abnormality of outdoor unit NO Does compressor operation? Is capacitor for compressor normal? NO Replace capacitor for compressor. YES Is connector for compressor connection good? NO Correct connection YES YES Replace compressor.
Checking the indoor electrical equipment (a) Indoor unit circuit board check procedure 1) Press the unit’s ON/OFF button for 5 seconds or longer (a beep which indicates receiving will be emitted). Then check the following items. 1 The indoor unit’s fan motor runs. 2 The run light lights up. 2) There should be voltage [AC 220-240 V (BP type: AC 220V)] between terminals 1 and 2 on the terminal block.
(9) 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.
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 R22 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.
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 - 2- No.034(1.
