Manual No. ’07 . 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 ..........................................................
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 SRK28HG-S (Indoor unit) SRC28HG-S (Outdoor unit) (220/230/240V) Model SRK28HG-S Item (1) Refrigerant piping Operation data(1) Cooling capacity 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 Refrig
Model SRK40HG-S (Indoor unit) SRC40HG-S (Outdoor unit) (220/230/240V) Model SRK40HG-S Item Operation data(1) Cooling capacity(1) Heating capacity(1) Power source Cooling input Running current (Cooling) Heating input Running current (Heating) Inrush current COP Cooling Sound level Power level Heating Sound level Power level Noise level Exterior dimensions Height × Width × Depth Color Net weight Refrigerant equipment Compressor type & Q’ty Motor Starting method Heat exchanger Refrigerant control Re
2.2 Range of usage & limitations Models All models Item Indoor return air temperature (Upper, lower limits) Cooling operation : Approximately 21 to 32˚C Heating operation : Approximately 15 to 30˚C Outdoor air temperature (Upper, lower limits) Cooling operation : Approximately 21 to 43˚C Heating operation : Approximately - 5 to 21˚C Refrigerant line (one way) length Max. 15m Max. 10m (Outdoor unit is higher) Max.
(2) Outdoor unit Drain holes (ø20) 50 12 111.4 99.4 290 312.5 350 43.1 313.1 23.5 Models All models 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 20, 28: ø9.52 (3/8'') 40: ø12.
2.4 Piping system Models SRK20HG-S, 28HG-S, 40HG-S Indoor unit Outdoor unit Flare connecting Piping (Gas) ø9.52 Cooling cycle Heating cycle Service valve (Gas) Outdoor air temp. sensor Check joint 4 way valve Accumulator Room temp. sensor Muffler Heat exchanger sensor Discharge temp. 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 Outdoor air D.B. temperature ˚C D.B.
Y/G RD 3 WH Y/G J J BR 1 BK L CM2 WH 5 FMI N CC CFI 52C ZNR U CM1 3 CNW - 5 9- SM ZNR CNM CNE CNG WH CM BK BK 52X1 Printed circuit board WH RD CNU WH G F 250V 3.15A IC15 RD 3 RD BK 52C 2/N 1 RD N 52C-3 HEAT EXCHANGER 52C-4 BR WH BK Y/G 3 RD WH 2/N BK 1 51C Y F 250V 3.15A CFO Y U 1 CNU 8 2 2 5 D.
4 OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER 4.1 Operation control function by remote control switch Remote control Models All models ◆ Operation selection 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.
Unit indication selection Models All models RUN light (green) Illuminates during operation and CLEAN operation. TIMER light (yellow) Illuminates during TIMER operation. HI POWER light (green) Illuminates during HIGH POWER operation. ECONO 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 operation Jumper wire (J6) 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. Be sure to modify both boards. If only one board is modified, receiving (and operation) cannot be done.
4.6 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. (Max.
4.7 Outline of heating operation (1) Operation of major functional components Functional components Indoor fan motor Item When the compressor command is OFF When the compressor command is ON When the compressor goes OFF due to an anomalous stop.
(b) When the compressor and outdoor fan are stopped 1) While the compressor operation is delayed. 2) Up until 5 minutes have passed Speed 9 Auto fan control, or the set fan speed Speed 5 Speed 3 Speed 3 since the end of a compressor start delay operation, when 52C goes OFF, the indoor unit’s fan OFF speed changes forcibly from OFF to speed 1. 25 30 34 30 30 34 37 40 43 Indoor heat exchanger temp.
(c) Operation of functinal components during defrosting operation ON Compressor command OFF Hot keep Controlled by the indoor heat exchanger temperature Hot keep ON Indoor unit fan OFF The chart at left is for reference. Hot keep control governs operation during heating. Lit RUN light Flashes ON Outdoor unit fan OFF ON 110 sec. 4-way valve OFF Defrost start operation 120 sec. Defrost operation 120 sec. Operation after defrost is ended.
4.8 Outline of cooling operation (1) Operation of major functional components Functional components Indoor fan motor 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 operation. Cooling 27.5 25.5 Dehumidifying Room temperature (˚C) 19.
4.12 Protective control function (1) Frost prevention for indoor heat exchanger (During cooling or dehumidifying) (a) Operating conditions (i) Indoor heat exchanger temperature (detected with Th2) is lower than 2.5ºC. (ii) 3 minutes elapsed after the start of operation.
(6) Serial signal transmission error protection (a) Purpose: Prevents malfunction resulting from error on the indoor ↔ outdoor signals. (b) Detail of operation: When the indoor unit controller ↔ outdoor unit controller signals cannot be received, the compressor is stopped immediately. Simultaneously, the red LED on the printed circuit board of outdoor unit controller flashing 6 times for 0.5 second at intervals of 8 seconds. Once the operation stops, it does not start any more.
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) (h) (2) 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. Left (Where space mentioned right can be secured) side Where wiring and the piping work will be easy to conduct.
5.2 Installation of indoor unit (1) Installation of installation board Fixing of installation board INSTALLATION SPACE (INDOOR UNIT) Look for the inside wall structures (Intersediate support or pillar and firaly install the unit after level surface has been checked.) (FRONT VIEW) Unit : mm Level position (2 locations) 200 44.5 252.2 65 39.3 43.2 Mating mark for level surface Space 138 206.5 102.5 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 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 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 Trouble shooting (1) Trouble shooting to be performed prior to exchanging PCB, (Printed circuit board) [Common to all models] All the models described in this chapter are controlled by a microcomputer. When providing maintenance service to customers it is necessary to understand the function controlled by a microcomputer thoroughly, so as not to mistakenly identify correct operations as mis-operations.
(2) Self diagnosis display on indoor unit TIMER light ON RUN light Outdoor unit LED Trouble Cause 1 time flash OFF Heat exchanger sensor error ¡ Broken heat exchanger sensor wire, connector poor connection 2 time flash OFF Room temperature sensor error ¡ Broken room temperature sensor wire, connector poor connection 6 time flash OFF Indoor fan motor error ¡ Defective fan motor, connector poor connection TIMER light RUN light keeps flashing RUN light ON 1 time flash OFF Outdoor air tem
[Compressor faulty, compressor wiring disconnected.] Trouble of outdoor unit NO Overload operation? Short circuit, Check if the heat exchanger is dirty, stopped up, etc. YES NO Is the refrigerant level proper? Adjust the level to the proper level. YES NO Is the wiring to the compressor connected securely? Connect it securely. YES Check the compressor.
[Wiring error including power cable, defective indoor/ outdoor unit PCB] Error of signal transmission NO Does error persist after power reset? Trouble by transient cause, not unit trouble. YES NO Is there any wrong connection on indoor/outdoor unit wiring? Correct improper wire connection on indoor/ outdoor unit. YES Is DC 0~Approx. 12V detected between 2~3 terminals on indoor unit terminal block? NO Defective indoor unit PCB YES Is DC 0~Approx.
(5) Inspection procedures of indoor electrical equipment Is fuse (3.15A) blown? NO Replace fuse. YES Is voltage applied between terminals 1~2 on terminal block? (AC 220/230/240V) NO Replace PCB. YES Is DC 0~12V detected between terminals 2~3 on terminal block? NO Replace PCB. YES Indoor electrical equipment are normal. Notes (1) Since the communication timing signal is transmitted only when the 52C is turned ON, check it under the operating condition. (2) Check the voltage on the terminal block.
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 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.
(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 39, 40) 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 37), and, as shown in Tables 5 and 6 (see on page 39), 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.
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. 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.
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. 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) Hose packing Gauge manifold • The most important service tool for refrigeration and air conditioner. Setting fixture • Widely used when charging/recovering R410A while checking gas pressure.
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.
