6.
CONTENTS 6.1 GENERAL INFORMATION ........................................................................ 193 6.1.1 Specific features ................................................................................. 193 6.1.2 How to read the model name ............................................................. 193 6.2 SELECTION DATA ..................................................................................... 194 6.2.1 Specifications ......................................................
6.1 GENERAL INFORMATION 6.1.1 Specific features (1) Equipped with an inverter scroll compressor. ¡Low noise. Low vibration and compact. (2) The long piping makes the location of the inside and units flexible. ¡No need for additional charge of refrigerant : 20 m ¡Maximum piping length : 30 m (3) Connectable indoor capacity Number of connectable units : 1 to 2 units Total of indoor units (class kW) : 6.5 kW (4) Indoor units are available with 5 capacities.
6.2 SELECTION DATA 6.2.
(2) Outdoor unit Model SCM45ZA Model SCM45ZA Item Cooling capacity W 4500 (2000 ~ 5100) Heating capacity W 5600 (2200 ~ 6000) Power source 1 Phase 220/240V 50Hz Cooling Power consumption 1820 (680 ~ 2050) W Heating 1950 (650 ~ 2190) Cooling Running current 8.4/7.7 A Heating 9.0/8.
(3) Operation data ¡ The combinations of the indoor units is indicated by numbers. They are read as follows. (Example) SKM22ZA / 22 SKM40ZA / 40 ¡ The capacity of the indoor units is shown by rooms. If this exceeds the maximum capacity of the outdoor unit, the demand capacity will be proportionally distributed. ¡ If units are to be combined, use the table below to make the proper selection. (a) Heating (220/240V) Heating capacity (kW) Power consumption (W) Running current (A) Min. Standard Max.
(b) Cooling (220/240V) Cooling capacity (kW) Power consumption (W) Running current (A) Indoor unit combination Room cooling capacity (kW) A room 1 room 2 room B room Total capacity (kW) Min. Standard Max. Min. Standard Max. Standard 22 2.2 1.1 2.2 2.5 350 750 900 3.44/3.16 25 2.5 1.1 2.5 2.8 350 900 1040 4.13/3.79 28 2.8 1.1 2.8 3.0 350 1040 1150 4.78/4.38 32 3.2 1.1 3.2 3.5 350 1200 1360 5.51/5.05 40 4.0 1.1 4.0 4.5 350 1580 1850 7.25/6.
6.2.2 Range of usage & limitations Model SCM45ZA Item Indoor intake air temperature (Upper, lower limits) Refer to the selection chart. Outdoor air temperature (Upper, lower limits) Indoor units that can be used in combination Number of connected units 1 to 2 units Total of indoor units (class kW) 6.5kW Total length for all rooms Max. 30m Length for one indoor unit Max. 25m Difference in When above outdoor unit (B) height between indoor and outdoor When below outdoor unit (A) units Max.
6.2.3 Exterior dimensions (1) Indoor unit Models SKM22ZA, 25ZA A Unit: mm 178 Room temp. thermistor 750 3 49 615 65 450 150 236.5 19 15 9 46 150 Terminal block 117 75 9 250 56 Piping hole right (left) 16 60 36 40 4.5 92 62 62 7.5 7.5 Piping for Gas (Ø9.52) 370 40 37 Piping for Liquid (Ø6.35) 420 Piping hole (Ø65) Model Piping hole (Ø65) VIEW A SKM28ZA Unit: mm A 790 174 3 Room temp.
Models SKM32ZA, 40ZA Unit: mm A 790 174 3 Room temp. thermistor 56 275 Piping hole right (left) 9 Terminal block 760 170 187.5 260 61 46 9 450 170 49 15 117 15 16 60 36 6 780 51 67 18 62 Piping for Gas (Ø12.7) 390 37 Piping for Liquid (Ø6.35) 440 Drain hose 600 (Ø16) Piping hole (Ø65) Piping hole (Ø65) VIEW A (2) Outdoor unit Model SCM45ZA 12 19 62 Elongated hole (2-16×12) 96.5 14.4 200 Ground terminal 29.7 Gas line service valve B Unit (ø9.
6.2.4 Piping system Model SCM45ZA Cooling cycle Heating cycle Outdoor unit Gas line (ø9.52) Thermistor (ThO-A) Service valve (Gas) (ø9.52) Indoor unit 4 way valve Check joint Thermistor (ThO-D) Muffler Discharge Heat exchanger Compressor Thermistor (ThI-A) Accumulator Thermistor (ThI-R) Thermistor (ThO-R) Suction Strainer Heat exchanger Liquid line (ø6.35) (ø6.
6.2.5 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.
6.3 ELECTRICAL DATA Meaning of marks • Outdoor Unit Symbol CM FM0 L DS EEVA, B 20S Parts name Compressor motor Fan motor Reactor Diode stack Electric expansion valve 4 way valve (coil) Symbol Tho-A Tho-R Tho-D LED2 LED1, 3 Parts name Thermistor (outdoor air temp.) Thermistor (outdoor H.X temp.) Thermistor (comp. dome temp.
(2) Outdoor unit Model SCM45ZA L UNIT A UNIT B 1 BK WH 2 RD 3 1 BK 2 3 WH Serial A Power transistor WH BL 52X2-4 Serial B S. OUT Power source 1 Phase 220/240V 50Hz 1 2 BL GY AC·R ~ + P IC2 AC·S ~ Fuse 250V 25A BK OR + + + U RD V WH + – N W BK DS R. IN WH S.
6.4 OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER (1) Remote Controller HI POWER operation indicator Indicators during HI POWER operation. FAN SPEED indicator ECONOMY operation indicator Indicators the ¡ for the fan speed which has been set. Indicators during ECONOMY operation. Operation switch over indicator Indicators the ¡ for the operation which has been set. ON-TIMER • OFF-TIMER indicator AIR FLOW indicator Indicator selected flap mode.
(3) Back-up switch When the remote controller become weak, or if the remote controller is lost or malfunctioning, 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) Detail of operation Operation starts in the same way as the previous operation.
(5) Comfort timer setting 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 comfort 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 thermistor) and the setting temperature. (Max.
(c) Operation of Major Functional Components in Cooling Mode Operation Functional components Instruction speed Indoor unit fan Cooling Thermostat OFF (All indoor units) See preceding table 0 (All indoor units) Fixed Fan, stop, abnormal stop Thermostat OFF (Some of indoor units) (Some of indoor units) 0 (Thermostat off units) 0 (Fan, stop, abnormal stop units) Failure (Outdoor Unit) 0 (All units) According to mode switching Automatic According to instruction speed According to mode switching Fi
(d) Hot keep operation If the hot keep operation is selected during the heating operation, the indoor fan is controlled based on the temperature of the indoor unit heat exchanger (detected with ThI-R, indoor unit heat exchanger thermistor) to prevent blowing of cool wind.
3) Operation of function component in defrosting 80 rps Outdoor unit speed Decision speed 0 rps Notes (1) Indoor unit fan is in response to Hot Keep. (2) Outdoor unit fan starts 6 seconds after the start of the compressor.
(9) Control and protection functions (a) Start of protection for compressor When the decision speed becomes a speed other than 0 rps and when the compressor is starting operation, an inverter decision speed of 40 rps or less indicates four-way valve switching protection and a speed of 40 rps or more indicates that protection of the compressor has started.
(e) High pressure cut protection control The high pressure cut protection operates during heating operations when a “heating 0 rps” serial signal is received from one of the two operating indoor units. 1 When only one of two operating units sends a “heating 0 rps”signal. Functional components Operation of each functional components Remarks 0 rps instruction A room Indoor unit instruction speed Instruction speed from indoor unit that has “heating 0 rps”. 2 min.
(f) Low Hz continuous operation protection control The following controls are performed to return oil to the compressor when the outdoor unit speed of 28 rps or more to 40 rps or less is continuously operated for 20 minutes. 1) The decision speed is forced to operate at 40 rps for 2 minutes. 2) The outdoor fan and electronic expansion valve are operated according to the outdoor unit speed.
(l) Compressor lock If the motor for the compressor does not turn a half a turn approximately 0.3 seconds after it has been started, it is determined that a compressor lock has occurred and the inverter is stopped.
6.5 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.
6.5.1 (a) Installation of indoor unit Caution for installation 1) The system should be applied to places as households, residences and the like. 2) The equipment shall be installed in accordance with national wiring regulations. 3) The connection to the fixed wiring of the mains supply must be made via a double pole isolating switch with a contact gap of at least 3mm in each pole.
3) Mounting of interconnecting wires (Field wiring) a) Remove the lid. b) Remove the terminal block cover. c) Connect the connection wire securely to the terminal block. Use cables for interconnection wiring to avoid loosening of the wires. CENELEC code for cables Required field cables. H05 RNR4G1.5 (Example) H Harmonized cable type 05 300/500 volts R Natural-and/or synth.
Drainage ¡ The drain hose must be fit with a downward slope. ¡ Do not set the drain hose like the following illustrations. under 5 cm Too high The end of the drain hose is touching the water. It curves like a wave. Smell from sewerage drains. The gap to the The end of the ground is less drain hose is than 5 cm. touching the sewage drains. ¡ Pour water in the drain pan below the heat exchanger and confirm that the water is drained outside.
6.5.3 Installation of outdoor unit (1) Selection of installation location (Please install with the customer’s consent in a location that follows the conditions listed below.) (a) Where the following installation space is available, and where air does not gather. (b) Where rain and sunlight do not directly hit the unit, and where there is enough air circulation. (c) Also, where the unit cannot be buried by snow.
6.5.4 Electrical wiring Circuit Circuit breaker breaker Power Powersource source 1 2 UNIT A 1 2 3 UNIT B 1 2 3 Out side 1 2 3 UNIT A 1 2 3 In side UNIT B Earth Earth leakage leakage breaker breaker (1) Connection of the power lines (a) This multi-type room air conditioner receives its power from outside. (b) It is necessary to use a single phase 200/240 V 50 Hz for the power supply. (c) An earth leakage breaker and a circuit breaker must be installed. Their capacities are listed below.
6.5.5 Refrigerant Piping (1) Limit The maximum permissible length of the refrigerant pipes for the outdoor units, and the maximum permissible height difference for the outdoor units are as shown below.
(2) Connection Indoor Outdoor Liquid side Gas side ¡ Secure the nut with a specified tightening torque to avoid any gas leaks. ¡ Gas side Liquid side ¡ Secure the nut with a specified tightening torque to avoid any gas leaks. ¡ When air purging with a vacuum pump, secure the nut with a specified tightening torque to avoid any gas leaks. ¡ When air purging with a refrigerant from an outdoor unit, just temporarily secure the nut. Specified tightening torques are as follows: Liquid side (ø 6.
(5) Heat insulation for joint Heat insulation for joints Vinyl tape Finish and fixing Cover the joint with insulation material for the indoor unit and tape it. Pipe clamp Pipes Crossover wires Position so the slit comes on top. Apply exterior tape and shape along the place where the pipes will be routed. Secure to the wall with a pipe clamp. Be careful not to damage the pipes and the wires. Exterior tape Drain hose Tapping screw 6.5.
6.6 MAINTENANCE DATA 6.6.1 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 micro computer thoroughly, so as not to mistakenly identify correct operations as mis-operations.
(2) Indication of self diagnosis Indoor unit indicator RUN lamp TIMER lamp Outdoor unit indicator (LED 2) 1 time flash Comes on Stays off Indoor heat exchanger thermistor error • Broken heat exchanger thermistor wire • Connector poor connection When heat exchanger thermistor temperature of –20 °C or under continued for more than 3 seconds while operation is stopped. (This is not displayed during operation.
(3) Inspection procedures corresponding to detail of trouble [Broken thermistor wire, connector poor connection] Thermistor error NO Is connector connection good? Correct connection. YES NO Is thermistor resistance value good? Replace thermistor. YES Replace PCB. ◆ Comp. dome thermistor temperature characteristics ◆ Thermistor temperature characteristics (Room temp., indoor and outdoor unit heat exchanger temp., outdoor temp.
[Broken power transistor, broken compressor wire] Outdoor unit error Is output voltage applied to all 3 phases of power transistor? NO Defective inverter YES Is compressor wiring connected securely? NO Connect securely. YES Inspect compressor. (Broken coil wire) [Overload operation, compressor lock, overcharge] Current safe stop NO Is refrigerant charge quantity adequate? Discharge refrigerant. YES Is outdoor ventilation condition good? NO Secure space for inlet and outlet.
[Defective fan motor, defective outdoor PCB] Outdoor fan motor error NO Is connector connection good? Correct connector connection. YES NO Is voltage applied to fan motor? (DC) Defective outdoor unit PCB YES Defective fan motor Serial signal transmission abnormality This is due to a temporary cause (interference, etc.) and is not a failure of the unit.
(4) Phenomenon observed after shortcircuit, wire breakage on thermistors. (a) Indoor unit Phenomenon Operation mode Thermistor Shortcircuit Broken wire Room temperature thermistor Cooling Release of continuous compressor operation command Continuous compressor operation command is not released. Heating Continuous compressor operation command is not released. Release of continuous compressor operation command Heat exchanger thermistor Cooling System can be operated normally.
(6) Indoor electrical components inspection flowchart Is there voltage between terminal blocks 1 and 2 ? (AC 220/240 V) NO Inspect power source for outdoor unit. YES Is the fuse burnt out? (3.15 A) NO Replace fuse. YES Is there voltage between CNC (1) and (2) on the secondary side of the transformer? (Approx. 12 V) NO Replace the transformer. YES Is the voltage between terminal blocks 2 and 3 oscillating between DC 0 and 12V? YES Indoor electrical components are normal.
(7) Outdoor unit inspection points CAUTION – HIGH VOLTAGE ¡Display lamp inspection • LED 2 (Abnormality display lamp - Red) ON or flashing: Protection function operating • LED 1, 3 (Light display for each room - ON when there is a serial signal being Green) received among each of the indoor units. OFF during ignition, stop abnormality. High voltage is produced in the control box. Don't touch electrical parts in the control box for 5 minutes after the unit is stopped.
6.6.2 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.
