Related Manuals for Mitsubishi Heavy Industries SRK20ZGX-S
Summary of Contents for Mitsubishi Heavy Industries SRK20ZGX-S
- Page 1 Manual No. ’07 . SRK-T . 065 TECHNICAL MANUAL Collection data INVERTER WALL MOUNTED TYPE ROOM AIR-CONDITIONER ( Split system, air to air heat pump type ) SRK20ZGX-S, 25ZGX-S, 35ZGX-S, 50ZGX-S...
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Page 2: Table Of Contents
CONTENTS 1. GENERAL INFORMATION ................1 Specific features ..................1 How to read the model name ..............1 2. SELECTION DATA..................2 Specifications ..................2 Range of usage & limitations ............... 6 Exterior dimensions ................6 Piping system ..................8 Selection chart .................. -
Page 3: 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. -
Page 4: Selection Data
SELECTION DATA 2.1 Specifications Model SRK20ZGX-S (Indoor unit) SRC20ZGX-S (Outdoor unit) (220/230/240V) Model SRK20ZGX-S SRC20ZGX-S Item Cooling capacity 2000 (500~2800) Heating capacity 2400 (500~4600) Power source 1 Phase, 220-240V, 50Hz Cooling input 0.37 (0.1~0.91) Running current (Cooling) 2.1/2.0/1.9 Heating input 0.44 (0.09~1.27) - Page 5 Model SRK25ZGX-S (Indoor unit) SRC25ZGX-S (Outdoor unit) (220/230/240V) Model SRK25ZGX-S SRC25ZGX-S Item Cooling capacity 2500 (500 ~ 3000) Heating capacity 3000 (500 ~ 5000) Power source 1 Phase, 220-240V, 50Hz Cooling input 0.50 (0.10 ~ 0.64) Running current (Cooling) 2.5/2.4/2.3 Heating input 0.59 (0.09 ~ 1.16) Running current (Heating)
- Page 6 Model SRK35ZGX-S (Indoor unit) SRC35ZGX-S (Outdoor unit) (220/230/240V) Model SRK35ZGX-S SRC35ZGX-S Item Cooling capacity 3500 (500 ~ 3900) Heating capacity 4200 (500 ~ 5100) Power source 1 Phase, 220-240V, 50Hz Cooling input 0.87 (0.10 ~ 0.98) Running current (Cooling) 4.2/4.0/3.8 Heating input 1.00 (0.09 ~ 1.19) Running current (Heating)
- Page 7 Model SRK50ZGX-S (Indoor unit) SRC50ZGX-S (Outdoor unit) (220/230/240V) Model SRK50ZGX-S SRC50GX-S Item Cooling capacity 5000 (600~5300) Heating capacity 6000 (600~7900) Power source 1 Phase, 220-240V, 50Hz Cooling input 1.56 (0.12~2.1) Running current (Cooling) 7.5/7.2/6.9 Heating input 1.66 (0.11~2.71) Running current (Heating) 7.9/7.6/7.3 Inrush current 7.9/7.6/7.3...
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Page 8: Range Of Usage & Limitations
2.2 Range of usage & limitations Models SRK20ZGX-S, 25ZGX-S, 35ZGX-S SRK50ZGX-S Item ooling operation: Approximately 21 to 32¡ Indoor return air temperature Heating operation: Approximately 15 to 30¡ (Upper, lower limits) ooling operation: Approximately -15 to 46¡ Outdoor air temperature Heating operation: Approximately -15 to 21¡... - Page 9 (2) Outdoor unit Models SRC20ZGX-S, 25ZGX-S, 35ZGX-S Drain holes (¿ 0) 313.1 349.5 439.1 104.9 165.1 18.9 61.9 -16 1 Terminal block Service valve (Liquid) Flare connection ¿6.35 (1/4'') 138.4 33.5 Service valve (Gas) Flare connection ¿9.5 (3/8'') Model SRC50ZGX-S 286.4 rain holes 203.1...
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Page 10: Piping System
2.4 Piping system Models SRK20ZGX-S, 25ZGX-S, 35ZGX-S Indoor unit Outdoor unit Cooling cycle Heating cycle Outdoor air Flare connection Service valve temp. sensor (Gas) Piping Check joint (Gas) ø9.52 4 way valve Accumulator Room temp. Discharge pipe Heat Heat temp. sensor... -
Page 11: Selection Chart
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 Cooling Heating... -
Page 14: Outline Of Operation Control By Microcomputer
OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER 4.1 Operation control function by remote control switch Wireless remote control Models All models S Operation section FAN SPEED button OPERATION MODE select button Each time the button is pushed, the indi- Each time the button is pushed, the indi- cator is switched over in turn. -
Page 15: Unit On/Off Button
Unit indication section RUN (HOT KEEP) light (green) Models All models • Illuminates during operation. • Brinks at air flow stop due to the ‘HOT KEEP’ and ‘CLEAN’ operation. 1.5 sec. HOT KEEP 0.5 sec. 3 sec. CLEAN HI POWER light (green) operation Illuminates during HIGH POWER operation. -
Page 16: Custom Cord Switching Procedure
4.4 Custom cord switching procedure umper wire ( 6) If two wireless remote controls are installed in one room, in order to prevent wrong operation due to mixed signals, please modify the printed circuit board in the indoor unit’s control box and the remote control using the following procedure. -
Page 17: Outline Of Heating Operation
(a) Fuzzy operation Deviation between the room temperature setting correction temperature and the suction air temperature is calculated in accordance with the fuzzy rule, and used for control of the air capacity and the inverter speed. Model SRK20ZGX-S SRK25ZGX-S SRK35ZGX-S SRK50ZGX-S... -
Page 18: Outline Of Cooling Operation
(2) Detail of control in each mode (Pattern) (a) Fuzzy operation During the fuzzy operation, the air flow and the inverter speed are controlled by calculating the difference between the room temperature setting correction temperature and the suction air temperature. Model SRK20ZGX-S SRK25ZGX-S SRK35ZGX-S SRK50ZGX-S Fan speed... -
Page 19: Protective Control Function
4.10 Protective control function (1) Frost prevention for indoor heat exchanger (During cooling or dehumidifying) (a) Operating conditions Indoor heat exchanger temperature (detected with Th2) is lower than 5ºC. Inverter command (ii) 10 minutes after reaching the inverter command speed except 0 rps. speed (b) Detail of anti-frost operation Upper limit... - Page 20 ◆ < 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.
- Page 21 (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 (detected by Th5) rose beyond 17ºC for 30 seconds continuously. (b) Detail of operation 1) Indoor fan speed is raised forcibly by 1 step.
- Page 22 (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 After lapse of 3 min.
- Page 23 (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 ↔...
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Page 24: Application Data
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 25: Selection Of Location For Installation
5.1 Selection of location for installation (1) Indoor unit Where there is no obstructions to the air flow and where the cooled air can be evenly distributed. Right (b) A solid place where the unit or the wall will not vibrate. side Left 10 cm... -
Page 26: Installation Of Indoor Unit
5.2 Installation of indoor unit (1) Installation of installation board (a) Fixing of installation board ook for the inside wall structures (Intersediate support or INSTALLATION SPACE (INDOOR UNIT) (FRONT VIEW) pillar and firaly install the unit after level surface has been Indoor unit checked.) Unit : mm... - Page 27 (3) Preparation of indoor unit (a) Mounting of connecting wires 1) Remove the lid. 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. Terminal block CENELEC code for cables.
- Page 28 [Drain hose changing procedures] 1. Remove the drain hose. 2. Remove the drain cap. 3. Insert the drain cap. 4. Connect the drain hose. ¡Remove the drain hose, ¡Remove it with hand or ¡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 making it rotate.
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Page 29: Installation Of Outdoor Unit
5.3 Installation of outdoor unit (1) Installation of outdoor unit Make sure that sufficient space for installation and service is secured. Fix the leg sections of the unit on a firm base which will not play. Attach cushion pads, etc. between the unit and the mounting fixtures not to transmit vibration to the building. Attach a drain elbow, etc. - Page 30 (3) Air purge Tighten all flare nuts in the pipings both indoor and outside will so as not to cause leak. Connect service valve, charge hose, manifold valve and vacuum pump as is illustrated below. 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 –...
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Page 31: Test Run
(3) Explain to the customer on the correct usage of the air conditioner in simple layman’s terms. (4) Make sure that drain flows properly. (5) Standard operation data (220/230/240V) Model SRK20ZGX-S SRK25ZGX-S SRK35ZGX-S SRK50ZGX-S Item –... -
Page 32: Maintenance Data
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. When working on an outdoor unit, there may be an electrical charge applied to the main circuit (electrolytic condenser), so begin work only after discharging this electrical charge (to DC 10 V or lower). - Page 33 (4) Troubleshooting procedure (If the air conditioner runs) Confirm the contents of the customer complaint. The cause of the trouble can be specifically identified. Eliminate the cause of the trouble and perform an Check the self-diagnosis display. operation check. See pages 32. Is an error code displayed by Using the Service Mode, access the self-diagnosis the self-diagnosis function?
- Page 34 (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.
- Page 35 (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.
- Page 36 *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.) ¥...
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Page 37: Remote Controller Setting
2 Stop data Remote controller setting Displayed data Temperature Operation Fan speed switching switching setting Cooling 1¡C Displays the reason for the stop (stop code) the previous time when the air conditioner was stopped by protective stop control. ¡C Displays the reason for the stop (stop code) times previous when the air conditioner was stopped by protective stop control. 3¡C Displays the reason for the stop (stop code) 3 times previous when the air conditioner was stopped by protective stop control. - Page 38 Number of flashes when in service mode Stop code Error content Auto Error Occurrence conditions Cause TIMER recovery display light Error code light Minor category Major category (10’s digit) (1’s digit) urrent Overcharge ooling overload 1 When there is a current safe stop in overload 1 mode 4 time 1 time safe...
- Page 39 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 Ò32Ó) The RUN light (1 Õs digit) flashes 3 times and the TIMER light (1Õs digit) flashes 2 times.
- Page 40 (v) Indoor temperature sensor temperature, indoor heat exchanger sensor temperature, outdoor air temperature sensor temperature, outdoor heat exchanger sensor temperature table nits: ¡C TIMER light (1’s digit) RUN light (10’s digit) Buzzer sound (minus) (sounds for 0.1 second) (does not sound) * If no data are recorded (error code is normal), the display for each sensor becomes as shown below.
- Page 41 (vi) Discharge pipe temperature table nits: ¡C TIMER light (1’s digit) RUN light (10’s digit) Buzzer sound (minus) (sounds for 0.1 second) (does not sound) * If no data is recorded (error code is normal), the display for sensor becomes as shown below. ensor value displayed when the error code is normal Sensor name -64¡C...
- Page 42 Service data record form Model ustomer Date of investigation Machine name ontent of complaint Display results Remote control settings Display content ontent of displayed data Temperature setting Operation switching Fan speed switching Buzzer (Yes/No.) RUN light (Times) TIMER light (Times) Error code on previous occasion.
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Page 43: Current Cut
(7) Inspection procedures corresponding to detail of trouble [Broken sensor wire, Sensor error connector poor connection] Is connector connection good? Correct connection. Is sensor resistance value good? Replace sensor. Replace PCB. ◆ Sensor temperature characteristics ◆ Discharge pipe sensor temperature characteristics (Room temp., indoor unit heat exchanger Temperature (˚C) Resistance (kΩ) -
Page 44: Outdoor Fan Motor Error
[Broken power transistor Trouble of outdoor unit broken compressor wire] Is output voltage applied to all 3 Defective inverter phases of power transistor? (Refer to page 49 for details) Is compressor wiring connected Connect securely. securely? Inspect compressor. [Defective fan motor, connector Indoor fan motor error poor connection, defective PCB] Is connector connection good? -
Page 45: Over Heat Of Compressor
[Gas shortage, defective discharge Over heat of compressor pipe sensor] Is discharge pipe sensor Connector connection check, resistance resistance value good? value check, replacement of discharge pipe (page 41) sensor Check if there are any Does trouble persist after Is sufficient quantity of refrigerant places where gas is leaking. - Page 46 [Compressor defect, outdoor Rotor lock unit circuit defect] Is output voltage applied to all 3 Defective inverter phases of power transistor? ¡ Check compressor wiring visually. If check results are normal, Inspect compressor. ¡ Check insulation resistance. (1 MΩ or over) compressor is locked.
- Page 47 (9) Checking the indoor electrical equipment (a) Indoor unit circuit board check procedure 1) Turn off the power. 2) Disconnect the wires connected between the indoor and outdoor units at the terminal block. (They can be disconnected at either the indoor or outdoor unit’s terminal block.) 3) Turn on the power.
- Page 48 (10) How to make sure of remote control Is remote Remote control control defects normal? Replace the display. Again pushing operating switch Is the unit operable with remote Normal control? Abnormality is not Operating the unit? found. Defective remote control Does unit ON/OFF button operates? Note (1) Check method of remote control...
- Page 51 ◆ Power transistor inspection procedure [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.
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Page 52: Servicing
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. -
Page 53: Refrigerant Piping Installation/Servicing Manual For Air Conditioners Using R410A
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) 7.1 Outline 7.1.1 Refrigerant R410A (1) Adoption of R410A in air conditioners In 1974, it was pointed out that the ozone layer in the upper stratosphere (about 20 ~ 40 km above ground) might have been damaged by the ozone depleting substances such as CFC (chlorofluorocarbon) and HCFC (hydrochlorofluorocarbon). -
Page 54: Refrigerant Piping Installation
(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. - Page 55 (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.
- Page 56 d) Flare processing øD Make certain that a clamp bar and copper pipe have been cleaned. 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”...
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Page 57: Storage Of Piping Materials
Table 8. Flare and flare nut dimensions for R22 [unit: mm] Dimension (mm) Nominal Outer diameter Thickness Flare nut width diameter (mm) (mm) 6.35 9.52 13.0 13.5 12.70 16.2 16.0 12.9 15.88 19.4 19.0 16.0 (2) Flare connecting procedures and precautions a) Make sure that the flare and union portions do not have any scar or dust, etc. - Page 58 (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 52), and, as shown in Tables 5 and 6 (see on page 54), it also differs from R22 in flare processing and flare nut dimensions. So, it is necessary to choose a piping set suitable for R410A.
- Page 59 (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. •...
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Page 60: Installation, Removal And Servicing
Reducing valve low meter Stop valve rom 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. - Page 61 (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 -0.1~3.5MPa -0.1~5.3MPa gauge (red)
- Page 62 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.
- Page 63 7.3.2 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.
- Page 64 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’...
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Page 65: Refrigerant Recovery
7.3.6 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. - Page 66 (4) 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.
- Page 67 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/cm • Generally, a setting fixture is provided only on one end. (4) Gauge manifold Hose Setting...
- Page 68 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 o.044 (1.1A) RO...
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