Page 2 - CONTENTS; Precautions for wireless remote controller installation and
2 SRK-GZ CONTENTS 1.1 GENERAL INFORMATION ........................................................................ 3 1.1.1 Specific features ................................................................................. 3 1.1.2 How to read the model name .............................................
Page 3 - GENERAL INFORMATION; Specific features; Fuzzy control; How to read the model name
3 SRK-GZ 1.1 GENERAL INFORMATION 1.1.1 Specific features The “Mitsubishi Daiya” 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...
Page 4 - SELECTION DATA; Specifications
4 SRK-GZ 1.2 SELECTION DATA 1.2.1 Specifications Model SRK25GZ-L1 (Indoor unit) SRC25GZ-L1 (Outdoor unit) Item Model SRK25GZ-L1 SRC25GZ-L1 Cooling capacity (1) W 2500 [900~2900] Heating capacity (1) W 3400 [900~4000] Power source 1 Phase, 220/240V, 50Hz Cooling input kW 0.96 [0.31~1.22] Running curr...
Page 7 - Range of usage & limitations
7 SRK-GZ 1.2.2 Range of usage & limitations (1) Inlet air temperature (a) Cooling operation (2) Total one way piping length and vertical height difference. Applicable temp.range Applicable temp. range JIS-Cooling JIS-Heating Indoor air temp. ºC W.B. Outdoor air temp. ºC W.B. Note: The chart is t...
Page 8 - VIEW A; Exterior dimensions; Model
8 SRK-GZ A 750 75 92 40 60 746.9 7.5 62 62 7.5 16 VIEW A 75 615 150 450 150 Room temp. thermistor Terminal block Piping for Gas ( Ø 9.52) 370 Piping for Liquid ( Ø 6.35) 420 Piping hole ( Ø 65) Piping hole ( Ø 65) Piping hole right (left) 178 3 250 46 15 19 9 236.5 4.5 36 117 40 37 36 56 9 49 A 790 ...
Page 11 - Piping system; Indoor unit
11 SRK-GZ 1.2.4 Piping system Model SRK35GZ-L1 Heat exchanger Strainer Service valve (Liquid) Flare connecting Service valve (Gas) Room temp.thermistor Piping (Gas) Ø12.7 Piping (Liquid) Ø6.35 Flare connecting Checkjoint 4way valve Discharge temp.thermistor Suction Capillary tube Check valve Heat ex...
Page 12 - ELECTRICAL DATA; Electrical wiring; Meaning of marks
12 SRK-GZ 1.3 ELECTRICAL DATA 1.3.1 Electrical wiring Meaning of marks Symbol Parts name Symbol Parts name Symbol Parts name CF I Capacitor for FMI RE Reactor Tr Transformer CM Compressor motor SM Flap motor ZNR Varistor F 1 , 2 Fuse Th1 Room temp. thermistor 20S 4 way valve (coil) FMI Fan motor (In...
Page 15 - EEV
15 SRK-GZ Model SRK502Z-L Power source 1 phase 220/240V 50Hz EEV CNU CNM CNE CNH Back up switch Wireless R-Amp Display CNF CNG Th 3 Th 2 Th 1 Th 7 Th 6 Th 5 ZNR 52C Printed circuit board Printed circuit board Printed circuit board Power transistor Fuse 250V 25A WH Y BL Y/GN LB BR RD WH BK RD CNB CNB...
Page 16 - OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER; Remote control switch; CONT HI POWER ECONO; ON OFF TIMER; AUTO; RUN; INVERTER; Models
16 SRK-GZ 1.4 OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER (1) Remote control switch Indoor unit indicator FAN SPEED ON/OFF MODE TEMP AIR FLOW SET TIMER TIMER ACL HI POWER ECONO CONT HI POWER ECONO ON OFF TIMER AUTO HI MED LO FAN SPEED indicator Indicators the ¡ for the fan speed which has been set...
Page 17 - functioning, this switch may be used to turn the unit on and off.; Operation; more to turn the unit off.; Detail of operation; Operation starts in the same way as the previous operation.; TIMER
17 SRK-GZ (2) Back-up switch When the remote controller become weak, or if the remote controller is lost or mal- functioning, this switch may be used to turn the unit on and off. (a) Operation Push the switch once to place the unit in the automatic mode. Push it once more to turn the unit off. (b) D...
Page 18 - Flap control; Control the flap by AIRFLOW button on the wireless remote control.; Starting time of operation; Swing flap; Flap moves in upward and downward directions continuously.; When not operating; Recommendable stopping angle of the flap
18 SRK-GZ (3) Flap control Control the flap by AIRFLOW button on the wireless remote control. (a) Natural flow (AUTO) The flap will be automatically set to the angle of air flow best to operation. (i) Starting time of operation ¡ The flap operation as shown above will berepeated. ¡ When the room tem...
Page 20 - (Temperature setting button on remote controller: Continuous)
20 SRK-GZ ¡ Hot keep M mode [During HI POWER operation (for 15 min.)] S SRK502Z-L (iii) Continuous mode operation (Temperature setting button on remote controller: Continuous) Model SRK25GZ-L1 SRK35GZ-L1 SRK502Z-L Item AUTO HI MED LO AUTO HI MED LO AUTO HI MED LO Inverter frequency 104Hz 98Hz 50Hz 9...
Page 21 - Defrosting operation
21 SRK-GZ (v) Defrosting operation S Models SRK25GZ-L1, 35GZ-L1 1) Starting conditions (Defrosting operation can be started only when all of the following conditions are met.) ¡ Model SRK25GZ-L1 1 After start of heating operation → When it elapsed 40 minutes. (Accumulated operation time) 2 After end...
Page 23 - Operating conditions; Outline of cooling operation; Outdoor blower is operated in accordance with the frequency.; Outline of dehumidifying operation
23 SRK-GZ Model SRK25GZ-L1 SRK35GZ-L1 SRK502Z-L 1 cycle 1 cycle 1 cycle Item 2 min. 3 min. 2 min. 3 min. 2 min. 3 min. Inverter frequency 92Hz 102Hz 108rps Indoor fan 5th speed 6th speed 6th speed 7th speed 6th speed 7th speed Outdoor fan ON ON Me (b) Detail of control in each mode (Pattern) (i) Fuz...
Page 24 - Outline of control; order to determine the operation range.
24 SRK-GZ OFF ON OFF 0 34 36 25 : 4835 : 50 Operating pattern D range C range B range A range Inverter frequency Indoor fan Outdoor fan Determination of coolingoriented dehumidifyingoperation range 4th speed 2nd speed 1st speed Temperature check 3 min. 3 min. 3 min. 3 min. 20 sec. (b) Outline of con...
Page 25 - Outline of automatic operation; Heating oriented dehumidifying
25 SRK-GZ (b) The unit checks the temperature every hour after the start of operation and, if the result of check is not same as the previous operation mode, changes the operation mode. (c) When the unit is started again within one hour after the stop of automatic operation or when the automatic ope...
Page 28 - Prevents abnormally high pressure operation during heating.
28 SRK-GZ Note (1) When the start delay of compressor of indoor unit controller is actuated and the operation is reset, it takes 2 minutes and 55 seconds. When stopped by indoor unit controller When stopped or reset by outdoor unit protective function Function Operation Heating, heating Cooling, coo...
Page 30 - WARNING
30 SRK-GZ 1.5 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 possib...
Page 31 - Selection of location for installation; Limitations for one way piping length and vertical
31 SRK-GZ 1.5.1 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. (Wh...
Page 32 - Installation of indoor unit; Fixing on concrete wall
32 SRK-GZ 1.5.2 Installation of indoor unit (1) Installation of installation board (a) Fixing of installation board (2) Drilling of holes and fixture sleeve (Option parts) (a) Drill a hole with ø65 whole core drill (b) Adjusting sleeve length (c) Install the sleeve (Inserting sleeve) Lock for the in...
Page 33 - Brown; Blue; Black
33 SRK-GZ (i) Open the suction grille, then remove the lid. (ii) Remove the wiring clamp. (iii) Pass the connecting wire to terminal block from behind of indoor unit. (iv) Connect the connecting wire securely to the terminal block. 1 Connect the connection wire securely to the terminal block. If the...
Page 34 - Installation on indoor unit; Installation of outdoor unit
34 SRK-GZ 1 Brown For power supply, indoor outdoor 2 Blue Connecting wiring 3 Black Indoor/outdoor signal wire (Low voltage) Yellow/Green Earth Wiring Terminal (4) Installation on indoor unit (a) Install the indoor unit on the mounting plate. Hook the upper part of the indoor unit on the stoppers di...
Page 35 - Refrigerant piping; Specified torquing value:
35 SRK-GZ 1.5.4 Refrigerant piping (1) Preparation Keep the openings of the pipes covered with tapes etc. to prevent dust, sand, etc. from entering them. Indoor unit side Outdoor unit side (2) Connection of refrigerant piping Indoor unit side ¡ Connect firmly gas and liquid sidepipings by Torque wre...
Page 36 - Insulation of connecting portion; Test run; Standard operation data
36 SRK-GZ Model Item SRK25GZ-L1 SRK35GZ-L1 SRK502Z-L Cooling – – – Heating 1.76~1.96 (18~20) 1.76~1.96 (18~20) 2.06~2.25 (21~23) Cooling 0.39~0.49 (4~5) 0.39~0.49 (4~5) 0.29~0.49 (3~5) Heating – – – Cooling 10~13 10~13 11~13 Heating 16~19 16~19 24~26 Cooling 4.8 6.3 10.2 Running current (A) Heating ...
Page 37 - When manipulating the remote controller mounted on; Wireless remote controller covers the following distances:
37 SRK-GZ (b) When manipulating the remote controller mounted on a wall: Make sure that it works normally (i.e., transmission/reception signal is audible) before mounting. Notes (1) The remote controller is correctly facing the sensing element of the air conditioner when beingmanipulated. (2) The ty...
Page 38 - MAINTENANCE DATA; Trouble shooting
38 SRK-GZ 1.6 MAINTENANCE DATA 1.6.1 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 necessa...
Page 39 - Self diagnosis display on indoor unit
39 SRK-GZ (2) Self diagnosis display on indoor unit TIMER lamp ON RUN lamp 1 time flash 2 time flash 6 time flash RUN lamp keeps flashing TIMER lamp 1 time flash 2 time flash 4 time flash Outdoor unit LED OFF OFF OFF Heat exchanger thermistor error Room temperature thermistor error Indoor fan motor ...
Page 40 - Current cut
40 SRK-GZ (3) Inspection procedures corresponding to detail of trouble [Broken thermistor wire,connector poor connection] Is connector connection good? YES YES NO NO Replace PCB. Correct connection. Replace thermistor. 30 25 20 15 10 5 30 20 10 40 50 60 70 0 –10 Temperature (˚C) Resistance (k Ω ) Te...
Page 43 - Press the reset switch of the remote controller.; ON OFF TIMER; CONT HI POWER ECONO
43 SRK-GZ (4) Phenomenon observed after shortcircuit, wire breakage on thermistor. (a) Indoor unit Operationmode Room temperaturethermistor Continuous compressor operation command is not released. Release of continuous compressor operation command Continuous compressor operation command is not relea...
Page 47 - CAUTION; Power transistor inspection procedure
47 SRK-GZ ◆ Check point of outdoor unit (SRC502Z-L) ◆ Inspection of resistance value of Comp. dome thermistor Remove the connector and check the resistance value. See the section of thermistor characteristics on page 40. ◆ Inspection of reactor conductivity ◆ Check lamp Remove the connector and chec...
Page 48 - Servicing; Evacuation
48 SRK-GZ Liquid side Gas side Check joint Service hose Charge hose Vacuumpump Refrigerantcylinder Gaugemanifold 1.6.2 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 r...
Page 49 - Power supply remote operation; Operation contents
49 SRK-GZ 1.6.3 Power supply remote operation When the remote part on indoor unit PCB is modified, the air conditioner is turned ON-OFF by power supply ON-OFF operation without using remote control switch. After the power supply remote operation, the operation contents can be modified by the remote ...
Page 50 - MEMO
