Summary of Contents for Mitsubishi Heavy Industries SRK20HC-S
- Page 1 Manual No. ’03 . SRK-T . 031 TECHNICAL MANUAL Collection data WALL MOUNTED TYPE ROOM AIR-CONDITIONER (Split system, air to air heat pump type) SRK20HC-S, SRK28HC-S, SRK40HC-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 ..............5 Exterior dimensions ................. 5 Piping system ................... 7 Selection chart .................. -
Page 3: General Information
GENERAL INFORMATION 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 equipment with opera- tion control switch and the outdoor unit is composed of condensing unit with compressor. -
Page 4: Selection Data
SELECTION DATA 2.1 Specifications Model SRK20HC-S (Indoor unit) SRC20HC-S (Outdoor unit) Model SRK20HC-S SRC20HC-S Item Cooling capacity 2050 Heating capacity 2200 Power source 1 Phase, 220/230/240V, 50Hz Cooling input 0.635 Running current (Cooling) 3.1/3.0/2.9 Heating input 0.605 Running current (Heating) 3.0/2.9/2.8... - Page 5 Model SRK28HC-S (Indoor unit) SRC28HC-S (Outdoor unit) Model SRK28HC-S SRC28HC-S Item Cooling capacity 2550 Heating capacity 2800 Power source 1 Phase, 220/230/240V, 50Hz Cooling input 0.79 Running current (Cooling) 3.9/3.7/3.5 Heating input 0.775 Running current (Heating) 3.7/3.5/3.3 Inrush current 17.2 Cooling: 3.21 Heating: 3.61 sound level Cooling...
- Page 6 Model SRK40HC-S (Indoor unit) SRC40HC-S (Outdoor unit) Model SRK40HC-S SRC40HC-S Item Cooling capacity 3600 Heating capacity 4000 Power source 1 Phase, 220/230/240V, 50Hz Cooling input 1.12 Running current (Cooling) 5.3/5.1/4.9 Heating input 1.165 Running current (Heating) 5.5/5.3/5.1 Inrush current 25.2 COP (Cooling) Cooling: 3.21 Heating: 3.42 sound level...
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Page 7: Range Of Usage & Limitations
Min. 85% of rating Frequency of ON-OFF cycle Max. 10 times/h ON and OFF interval Max. 3 minutes 2.3 Exterior dimensions (1) Indoor unit Models SRK20HC-S, 28HC-S, 40HC-S Unit: mm Piping hole right (left) Therminal block 117.5 117.5 216.5 216.5 216.5... - Page 8 (2) Outdoor unit Models SRC20HC-S, 28HC-S Unit: mm Drain holes 264.5 404.5 17.8 2-16 x12 Terminal block 61.9 Service valve (Liquid) 139.3 33.3 Flare connecting ø6.35 (1/4") Service valve (Gas) Flare connecting ø9.52 (3/8") Model SRC40HC-S 286.4 Drain hole 203.1 136.9 Elogated hole (2-12 x16)
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Page 9: Piping System
2.4 Piping system Models SRK20HC-S, 28HC-S, 40HC-S Indoor unit Outdoor unit Cooling cycle Heating cycle Outdoor air Flare connecting Service valve temp. thermistor (Gas) Piping Check joint (Gas) 20, 28 : ø9.52 40 : ø12.7 4 way valve Accumulator Room temp. -
Page 10: 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 11: Electrical Data
Power source 1 Phase 220/230/240V 50Hz Indoor unit Outdoor unit Y/GN Y/GN HEAT EXCHANGER 52X1 (i250V 3.15A) (250V 3.15A) Printed circuit 52X2 board 52X3 Color symbol 52X1 Black Display Printed circuit Brown 52X2 board Wireless Light blue R-Amp 52X3 White Y/GN Yellow/Green Meaning of marks... -
Page 12: Outline Of Operation Control By Microcomputer
OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER 4.1 Operation control function by remote control switch Remote controller 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 13: Back-Up Switch
Unit indication section Models All models RUN (HOT KEEP) light (green) • Illuminates during operation. • Flashes at air flow stop due to the ‘HOT KEEP’. TIMER light (yellow) Illuminates during TIMER operation. TIMER HI POWER light (green) HIPOWER Illuminates during HI POWER operation. ECONO ECONOMY light (orange) Illuminates during ECONOMY operation. -
Page 14: Flap Control
4.4 Flap control Control the flap by AIRFLOW button on the wireless remote controller. (1) Air scroll The flap will be automatically set to the angle of air flow best to operation. (a) Starting time of operation During cooling and During heating dry operation operation... -
Page 15: Outline Of Heating Operation
4.6 Outline of heating operation (1) Operation of major functinal components Item When the compressor When the compressor When the compressor goes Functional command is OFF command is ON OFF due to an abnormal stop. components Indoor fan motor Flaps ON or OFF ON or OFF Stop position control... - Page 16 (b) When the compressor and outdoor fan are stopped 2) Up until 5 minutes have passed 1) While the compressor operation is delayed. since the end of a compressor Speed 6 start delay operation, when 52C Auto fan control, Speed 4 or the set fan speed goes OFF, the indoor unit’s fan Speed 2...
- Page 17 (c) Operation of functinal components during defrosting operation Compressor command Hot keep Controlled by the indoor heat Hot keep exchanger temperature Indoor unit fan The chart at left is for reference. Hot keep control governs operation Operating lamp during heating. Flashes Outdoor unit fan 4-way valve...
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Page 18: Outline Of Cooling Operation
4.7 Outline of cooling operation (1) Operation of major fanctinal components Item When the compressor When the compressor When the compressor goes Functional command is OFF command is ON OFF due to an abnormal stop. components Indoor fan motor Flaps ON or OFF ON or OFF Stop position control... -
Page 19: Outline Of Dehumidifying Operation
4.8 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 B Block A Block –2 Room temp. – Setting temp.(deg) (2) Start up operation C.D Block A.B Block... -
Page 20: Automatic Operation
4.9 Automatic operation (1) Determination of operation mode The blow operation of the indoor fan is carried out at the 1st speed for 20 seconds and the room temperature is checked to determine the operation mode automatically. (When the unit is operated by the turn-on timer, the blow operation is not carried out.) <... - Page 21 (5) High-pressure control The indoor heat exchanger thermistor detection temperature controls the outdoor fan and compressor. ¡ When the indoor heat exchanger ¡ When the indoor heat exchanger temperature Is 58˚C temperature Is 62˚C Outdoor fan Compressor Indoor heat exchanger temp. (˚C) Indoor heat exchanger temp.
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Page 22: 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 23: 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. (b) A solid place where the unit or the wall will not vibrate. 6.5 cm Right side... -
Page 24: Installation Of Indoor Unit
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 INSTALLATION SPACE (INDOOR UNIT) (FRONT VIEW) pillar and firaly install the unit after level surface has been Unit : mm checked.) Speace for... - Page 25 (3) Preparation of indoor unit (a) Mounting of connecting wires 1) Remove the lid (R). 2) Remove the terminal cover. 3) Remove the wiring clamp. 4) Connect the connecting wire securely to the terminal block. Terminal block Use cables for interconnection wiring to avoid loosening of the wires.
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Page 26: Installation Of Outdoor Unit
(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 disposed at the upper part of the mounting plate and lightly push the lower part of the indoor unit so that the unit is fixed in position. ¡... - Page 27 (2) Connection of refrigerant piping Outdoor unit side Indoor unit side ¡ Connect firmly gas and liquid side ¡ Connect firmly gas and liquid side pipings by Torque wrench. pipings by Torque wrench. Spanner (for fixing the piping) Torque wrench ¡...
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Page 28: Test Run
(b) It is very important to be careful of above when plugging in the unit to an already furnished electrical outlet. (4) Explain to the customer on the correct usage of the air conditioner in simple layman’s terms. (5) Make sure that drain flows properly. (6) Standard operation data (220/230/240V) Model SRK20HC-S SRK28HC-S SRK40HC-S Item – –... -
Page 29: Maintenance Data
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 micro computer thoroughly, so as not to mistakenly identify correct operations as mis-operations. - Page 30 (2) Self diagnosis display on indoor unit RUN lamp Outdoor unit LED Trouble Cause ¡ Broken heat exchanger thermistor wire, connector Heat exchanger thermistor error 1 time flash poor connection ¡ Broken room temperature thermistor wire, TIMER lamp Room temperature thermistor error 2 time flash connector poor connection ¡...
- Page 31 Current cut [compressor lock] Is the service valve open? Service valve opened. Secure space for suction Is there any shortcircuit? and blow out. ¡ Check compressor wiring visually. If check results are normal, ¡ Check insulation resistance. (1 MΩ or over) Inspect compressor.
- Page 32 [Wiring error including power cable, defective indoor/ Serial signal transmission error outdoor unit PCB] Does error persist after power Trouble by transient cause, not unit trouble. reset? Correct improper wire connection on indoor/ Is there any wrong connection on outdoor unit. indoor/outdoor unit wiring? Is DC 0~Approx.
- Page 33 (5) Inspection procedures of indoor electrical equipment Is fuse (3.15A) blown? Replace fuse. Is voltage applied between terminals 1~2 on terminal Replace PCB. block? (AC 220/230/240V) Is DC 0~12V detected between terminals 2~3 on terminal Replace PCB. block? Indoor electrical equipment are normal.
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Page 34: 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.