Midea 18K User Manual Download

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Owner’s Manual &

Installation Manual

IMPORTANT NOTE:

Read this manual carefully before installing
or operating your new air conditioning
unit. Make sure to save this manual for
future reference.

AIR-HANDLER AIR CONDITIONERS

Installation Manual

Summary of Contents for 18K

Page 1: ...tallation Manual IMPORTANT NOTE Read this manual carefully before installing or operating your new air conditioning unit Make sure to save this manual for future reference AIR HANDLER AIR CONDITIONERS Installation Manual ...

Page 2: ...nse and attention to safety is required when installing operating and maintaining this product Improper installation adjustment alteration service or maintenance can cause property damage personal injury or loss of life Installation and service must be performed by a licensed professional HVAC installer or equivalent service agency WARNING Owner s Manual Installation Manual SAFETY PRECAUTIONS 3 AC...

Page 3: ...rectly to cool air for a prolonged period of time If the air conditioner is used together with burners or other heating devices thoroughly ventilate the room to avoid oxygen deficiency In certain environments such as kitchens server rooms etc the use of specially designed air conditioning units is highly recommended This unit is not designed for nonducted freeblow applications Electric heat strips...

Page 4: ...ow all local and national wiring standards regulations and the Installation Manual Connect cables tightly and clamp them securely to prevent external forces from damaging the terminal Improper electrical connections can overheat and cause fire and may also cause shock All electrical connections must be made according to the Electrical Connection Diagram located on the panels of the indoor and outd...

Page 5: ...age piping according to the instructions in this manual Improper drainage may cause water damage to your home and property 7 Do not install the unit in a location that may be exposed to combustible gas leaks If combustible gas accumulates around the unit it may cause fire 8 Do not turn on the power until all work has been completed 9 When moving or relocating the air conditioner consult experience...

Page 6: ...ow used for AHRI testing NOTICE The maximum functional total external static pressure can not exceed 0 80 in WC or 200 Pa The airflow reduces significantly beyond 0 80 in WC or 200 Pa System design should allow for the increased resistance of filters as they become dirty Safety Precautions Model 18 24K 30 36K 48 60K Pressure 0 10 in H2O 25 Pa 0 15 in H2O 37 Pa 0 20 in H2O 50 Pa ...

Page 7: ... or equipment failure Accessories Packed with the indoor unit ACCESSORIES Accessories NOTICE The remote control is only used to adjust the parameters Accessories Packed with the outdoor unit Owner s Manual Installation Manual Name Shape Quantity 1 Remote controller 1 2 2 1 2 Battery Flare to braze adapter Wired remote controller Cable ties 2 Flare nut 4 Foam 2 Flare to braze adapter Name Shape Qua...

Page 8: ...e to follow these instructions can result in death explosion or fire The indoor unit should be installed in a location that meets the following requirements Enough room for installation and maintenance Enough room for the connecting refrigerant tubing and drainpipe The structure that the equipment is suspended from must support the weight of the indoor unit Room for properly sized return and suppl...

Page 9: ... be an airtight seal between the bottom of the air handler and the return air plenum Use fiberglass sealing strips foil duct tape caulking or equivalent sealing method between the plenum and the air handler cabinet to ensure a tight seal Return air must not be drawn from a room where this air handler or any gas fueled appliance i e water heater or carbon monoxide producing device i e wood fireplac...

Page 10: ... work is a must where it runs through an unconditioned space during the cooling season The use of a vapor barrier is recommended to prevent absorption of moisture from the surrounding air into the insulation The supply air duct should be properly sized by use of a transition to match unit opening All ducts should be suspended using flexible hangers and never fastened directly to the structure This...

Page 11: ...ed in all installations over a finished living space or in any area that may be damaged by overflow from the main drain pan In some localities local codes may require a secondary drain pan for any horizontal installation This unit is not designed for nonducted freeblow applications Electric heat strips and or blower is easily accessible without duct and presents electrocution or injury hazard down...

Page 12: ...w horizontal left or horizontal right orientations Indication of the position of each temperature sensor of the evaporator 18 24K model 30 48K model 60K model T2A T2 EEV T2B T1 T2 T2A T2B T1 T2 T2A T2B T1 EEV EEV Reversing instructions 1 Remove the filter door then take the filter off 2 Remove the upper cover assembly 3 Remove evaporator cover plate Indoor Unit Installation ...

Page 13: ...oard T1 Room temperature sensor T2 Evaporator central sensor plug T2A Evaporator intput sensor plug T2B Evaporator output sensor plug 5 Remove T1 T2 T2A T2B EEV sensor wire ties T2 T2A T2B T1 EEV 6 Take out the evaporator and drain pan and rotate 180 7 Adjust the position of the mounting parts 8 Reinstall the evaporator and drain pan Indoor Unit Installation ...

Page 14: ...EV and tie up the sensor wires 10 The evaporator is assembled in place 11 Reinstal evaporator cover plate 12 Connect the wire according to the wiring diagram fi th Use cable ties to fix the room temperature sensor as shown in the figure Cut the foam gasket Remove knockouts as shown in the figure Hook the wire into the buckle and go down from the wire slot Replace foam gasket Indoor Unit Installati...

Page 15: ...T mode the outdoor unit will discharge water Ensure that the drain hose is placed in an appropriate area to avoid water damage and slippage Do not pull the drainpipe forcefully This could disconnect it WARNING After removal of drain pan plug s check drain hole s to verify that drain opening is fully open and free of any debris Also check to make sure that no debris has fallen into the drain pan du...

Page 16: ...e horizontal run to eliminate air trapping NOTE ON DRAINPIPE INSTALLATION The Figure shows how to trap or plug all drains during vertical discharge The Figure shows how to trap or plug all drains during right hand discharge The seal plug are supplied as accessories and should be screwed tightly only by hand Incorrect installation could cause water to flow back into the unit and flood NOTICE The dr...

Page 17: ...r completing the installation work Notes On Pipe Length and Elevation Ensure that the length of the refrigerant pipe the number of bends and the drop height between the indoor and outdoor units meets the requirements shown in the following table The Maximum Length And Drop Height Based on Models Unit m ft CAUTION Oil traps If oil flows back into the outdoor unit s compressor this might cause liqui...

Page 18: ...flaring is essential to achieve an airtight seal 1 After removing burrs from cut pipe seal the ends with PVC tape to prevent foreign materials from entering the pipe 2 Sheath the pipe with insulating material 3 Place flare nuts on both ends of pipe Make sure they are facing in the right direction because you can t put them on or change their direction after flaring Connection Instructions Refriger...

Page 19: ...25 5 26 5 ft lb 16 2 0 64 16 5 0 65 Ø16 5 8 45 47 N m 33 34 5 ft lb 19 2 0 76 19 7 0 78 Ø19 3 4 65 67 N m 48 49 5 ft lb 23 2 0 91 23 7 0 93 Ø22 7 8 75 85 N m 55 5 62 5 ft lb 26 4 1 04 26 9 1 06 PIPING EXTENSION BEYOND FLARE FORM 5 Clamp flare form on the end of the pipe The end of the pipe must extend beyond the flare form 6 Place flaring tool onto the form 7 Turn the handle of the flaring tool cl...

Page 20: ...ere is no refrigerant leak after completing the installation work If there is a refrigerant leak ventilate the area immediately and evacuate the system refer to the Air Evacuation section of this manual 60K Air Handler Air Conditioners Refrigerant Piping Connection Complete the indoor unit connection pipe assembly as shown below use flare to braze 3 4 to 7 8 and flare to braze 3 8 to 3 8 adapters ...

Page 21: ...ing supplemental heating the optional Electric Auxiliary Heat Module is available in sizes from 3kW to 25kW to accommodate appropriate sizing given the specific heat load and electrical requirements of each installation Please refer to the table below for selection of available sizes of each model being sure to avoid improper matching Before installation please confirm the electric auxiliary heat ...

Page 22: ... the support holes in the back of the cabinet 4 Tighten the mounting screws 5 Wiring according to the wiring nameplate 6 Apply the wiring diagram to the inside cover when wiring is completed for future reference and maintenance 7 Install the upper cover 8 Install silicone breaker cover screws 9 After installing the electric auxiliary heat module apply the circuit breaker label near the silicone br...

Page 23: ... AWG Fuse Ckt Bkr Amps 18K 208 230 1 2 0 2 5 16 15 0 24K 208 230 1 3 0 4 0 16 15 0 30K 208 230 1 3 5 4 5 16 15 0 36K 208 230 1 4 0 5 0 16 15 0 48K 208 230 1 6 0 7 5 16 15 0 60K 208 230 1 7 0 9 0 16 15 0 Specifications Number of circuit breakers Number of relays Number of power cord groups Number of power cord grounding screws 3kW 1 1 2 2 5kW 1 1 2 2 8kW 1 2 2 2 10kW 1 2 2 2 15kW 2 3 3 3 20kW 2 4 3...

Page 24: ...8B UL 8 Ckt Bkr 28 8 32 0 37 0 42 0 40 0 45 0 EAH 10B UL 10 Ckt Bkr 36 0 40 0 46 0 53 0 50 0 60 0 EAH 15B UL 15 Ckt Bkr 18 0 20 0 23 0 27 0 25 0 30 0 36 0 40 0 46 0 53 0 50 0 60 0 EAH 20B UL 20 Ckt Bkr 36 0 40 0 46 0 53 0 50 0 60 0 36 0 40 0 46 0 53 0 50 0 60 0 EAH 25B UL 25 Ckt Bkr 18 0 20 0 23 0 27 0 25 0 30 0 36 0 40 0 46 0 53 0 50 0 60 0 36 0 40 0 46 0 53 0 50 0 60 0 Indoor Unit Installation 1...

Page 25: ...s optional The wiring type of the actual unit shall prevail NOTE3 TO BE WIRED IN ACCORDANCE WITH NEC AND LOCAL CODES NOTE4 POWER A B C D ARE DIFFERENT POWERS Y G RED YELLOW BLACK 3 24V Aux Heat control signal 5 RELAY1 RED BLACK BLACK TO INDOOR UNIT MAINBOARD cn12 TO INDOOR UNIT MAINBOARD cn11 L1 L2 3 S 1 L1 2 L2 POWER A 5 HTR1 7 2 7 POWER B green Y G Y G The wiring mode of power supply A shall be ...

Page 26: ...lement is optional The wiring type of the actual unit shall prevail NOTE3 TO BE WIRED IN ACCORDANCE WITH NEC AND LOCAL CODES NOTE4 POWER A B C D ARE DIFFERENT POWERS Y G RED YELLOW BLACK 3 BLACK BLACK RED RED RELAY2 RELAY1 BLACK RED RED BLACK 0 0 Aux Heat control signal 24V 72 1 225 81 7 0 1 2 5 1 72 1 225 81 7 0 1 2 5 1 3 S 1 L1 2 L2 RED BLACK HTR1 7 2 7 RED BLACK HTR2 7 2 7 L1 L2 POWER A POWER B...

Page 27: ... element is optional The wiring type of the actualunit shall prevail NOTE3 TO BE WIRED IN ACCORDANCE WITH NEC AND LOCAL CODES NOTE4 POWER A B C D ARE DIFFERENT POWERS Y G RED YELLOW BLACK 3 5 5 5 RELAY4 RELAY1 RELAY2 8 5 Aux Heat control signal 24V 72 1 225 81 7 0 1 2 5 1 72 1 225 81 7 0 1 2 5 1 5 3 S 1 L1 2 L2 RED BLACK HTR1 7 2 7 RED BLACK HTR2 7 2 7 5 HTR3 7 2 7 L1 L2 L1 L2 POWER A POWER B POWE...

Page 28: ...hall prevail NOTE3 TO BE WIRED IN ACCORDANCE WITH NEC AND LOCAL CODES Y G NOTE4 POWER A B C D ARE DIFFERENT POWERS The wiring mode of power supply A shall be based on the type of original wiring terminal of AHU for type A S position must be connected to the ourdoor S for type B S position shall not be connected RED YELLOW BLACK 3 RED RED BLACK BLACK RED RED RELAY3 RELAY4 RELAY2 RELAY1 RED BLACK BL...

Page 29: ...E WIRED IN ACCORDANCE WITH NEC AND LOCAL CODES NOTE4 POWER A B C D ARE DIFFERENT POWERS Y G 3 S RED 1 L1 2 L2 YELLOW BLACK 3 RED BLACK BLACK BLACK BLACK RELAY5 0 4 BLACK BLACK BLACK RED RED RED RED RED RED BLACK BLUE RED RELAY3 RELAY4 RELAY2 RELAY1 Aux Heat control signal 0 4 8 0 24V 72 1 225 81 7 0 1 2 5 1 72 1 225 81 7 0 1 2 5 1 BLACK BLACK RED RED RED BLACK 8 BLACK BLACK L1 L2 L1 L2 L1 L2 RED B...

Page 30: ...hat is exposed to large amounts of dust STEP 2 INSTALL DRAIN FITTING Before bolting the outdoor unit in place you must install the drain fitting at the bottom of the unit e v o b a n i 4 2 m c 0 6 60cm 24in on right 30cm 12in on left 200cm 79in in front 30cm 12in rong ind Strong wind Strong wind Wind Ba Wind Baffle Strong wind Strong wind Strong wind STEP 1 SELECT INSTALLATION LOCATION Before inst...

Page 31: ...e to support at least four times the weight of the unit NOTE There are two different types of drain fittings depending on the type of outdoor unit If the drain fitting comes with a rubber seal see Fig A do the following 1 Fit the rubber gasket on the end of the drain fitting that will connect to the outdoor unit 2 Insert the drain fitting into the hole in the base pan of the unit 3 Rotate the drai...

Page 32: ...810 31 29 32 410 16 5 32 673 26 1 2 15 7 8 952 404 37 1 2 1333 52 1 2 415 16 11 32 634 24 35 36 15 29 32 890 35 673 26 1 2 342 13 15 32 663 26 1 8 354 13 15 16 Outdoor Unit Installation Unit Mounting Dimensions The following is a list of different outdoor unit sizes and the distance between their mounting feet Prepare the installation base of the unit according to the dimensions below Outdoor Unit...

Page 33: ...corporated in the fixed wiring The qualified technician must use an approved circuit breaker or switch 7 Only connect the unit to an individual branch circuit Do not connect another appliance to that circuit 8 Make sure to properly ground the air conditioner 9 Every wire must be firmly connected Loose wiring can cause the terminal to overheat resulting in product malfunction and possible fire 10 D...

Page 34: ...pare the cable for connection a You must first choose the right cable size b Using wire strippers strip the jacket from both ends of the cable to reveal approximately 15cm 6 of wire c Strip the insulation from the ends d Stranded wire requires u lugs or ring terminals to be crimped onto the ends of the wire 2 Remove the electric cover of the outdoor unit If there is no cover on the outdoor unit ta...

Page 35: ...d length for wiring In North America Outdoor Unit A Outdoor Unit B L2 L1 OPTIONAL L1 TO POWER SOURCE TO POWER SOURCE L2 Wiring 4 Clamp down the cable with the cable clamp 5 Insulate unused wires with electrical tape Keep them away from any electrical or metal parts 6 Reinstall the cover of the electric control box Outdoor Unit A Outdoor Unit B WARNING RISK OF ELECTRIC SHOCK CAN CAUSE INJURY OR DEA...

Page 36: ...MUNICATION LEADS Indoor Unit Wiring 1 Prepare the cable for connection a Using wire strippers strip the rubber jacket from both ends of the signal cable to reveal about 15cm 6 of the wire b Strip the insulation from the ends of the wires 2 Open the front panel of the indoor unit Using a screwdriver remove the cover of the electric control box on your indoor unit 3 Thread the power cable and the si...

Page 37: ...ielded communication or thermostat wire is not required but is recommended where separation from high voltage conductors can not be maintained or in areas with high electrical noise The shield and drain conductor must be grounded at the outdoor unit and stripped back and taped at the indoor unit Grounding at both ends results in an increase of noise transmitted onto the signal wires When using a 2...

Page 38: ...able for the AHU and ODU with 24V thermostat Wiring for 4H and 2C thermostat NOTICE This equipment uses B functionality This terminal is energized for heating functionality Please ensure that thermostat configuration is set up for B functionality R L G B W E C Y1 DH W1 W2 R B W D L C Y1 Y2 INDOOR UNIT OUTDOOR UNIT DH O B W2 Y G L C R W1 E THERMOSTAT S4 1 DIP switch off Perform disconnection and sh...

Page 39: ...P switch off Disconnect and short circuit to realize heating segment R L G B W E C Y1 DH W1 W2 R B W D L C Y1 Y2 INDOOR UNIT DH O B Y2 Y1 G L C R W1 E THERMOSTAT R L G B W E C Y1 DH W1 W2 R B W D L C Y1 Y2 INDOOR UNIT OUTDOOR UNIT O B Y2 Y1 G C R THERMOSTAT S4 2 DIP switch off Disconnect and short circuit to realize heating segment R L G B W E C Y1 DH W1 W2 R B W D L C Y1 Y2 INDOOR UNIT OUTDOOR UN...

Page 40: ...Y1 DH W1 W2 R B W D L C Y1 Y2 INDOOR UNIT OUTDOOR UNIT W Y G C R THERMOSTAT The fault warning Alarm output An alarm output CN33 can be utilized if actions are required when a fault is present This is a passive outlet port so you will need to input a voltage signal The relay is normally open for normal operation and closed when a fault condition is active Humidifier control Optional function wiring...

Page 41: ...cation control requires external Humidistat at DH and R Set S4 2 as OFF When the humidity rises and exceeds the set value of the Humidistat the 24V signal of DH changes to 0V the cooling system starts the dehumidification operation and the air volume drops to 80 of the nominal cooling air volume UV fresh air or ion generator wiring 1 2 ON S4 DH R HUMIDISTAT The WORK port is linked with the fan Whe...

Page 42: ...eating zone control Heating zone control 0 1 1 0 0 0 1 1 1 0 0 0 1 1 1 1 0 0 0 0 1 0 1 0 1 0 0 0 0 0 1 1 0 1 0 1 0 0 0 0 0 0 0 1 1 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 1 0 1 0 0 1 0 0 1 0 0 0 0 0 0 0 0 0 0 1 0 1 1 0 1 1 0 0 1 1 1 0 0 0 0 0 0 0 0 0 0 0 1 1 0 1 0 0 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 1 0 1 1 0 0 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 00 01 02 03 04 ...

Page 43: ... S2 S3 SW4 1 2 3 4 ON 1 2 ON ON ON ON 1 2 3 4 1 2 3 4 1 2 3 4 B W W1 E Y X G Y1 Y Y2 Function DIP switch Address DIP switch Function DIP switch Static pressure DIP switch 24V control DIP switch 24V thermostat interface Function Rotary switch Address switches Wiring ...

Page 44: ...s 15 minutes SW2 2 Electric heat on delay 6 The heater will not operate if the outdoor temperature is greater than the temperature set by S3 The compressor will not operate if the outdoor temperature is lower than the temperature set by S3 SW2 4 Compressor Auxiliary heat outdoor ambient lockout 8 1 C 1 8 F 2 C 3 6 F SW3 2 Cooling and heating Y2 temperature differential adjustment 10 30 minutes 90 ...

Page 45: ...kscreen is NET address which is composed of a 16 bit address rotary code S2 plus a two digit DIP switch S1 Set during engineering installation no network function does not need to be set When S2 is 00 the dialing code is not connected the network address value is the value of S2 When S2 is 01 corresponding to the dial code of the 5 1K resistor connected to the hardware is turned on the network add...

Page 46: ... 10KW 8KW 10KW 8KW 15KW 10KW 8KW 5KW 20KW 10KW 8KW 15KW 8KW 10KW 8KW 15KW 10KW 10KW 25KW 15KW 10KW 20KW 15KW 15KW 5KW 3KW 10KW 8KW 15KW 8KW 880 1320 2195 850 1040 1255 1675 2055 830 990 1190 1580 1920 800 930 1125 1490 1775 SW4 1 2 3 setting default air volume CFM 001 air volume CFM 010 air volume CFM 011 air volume CFM Model 24K 18K 30K 60K 48K 36K 570 600 630 10KW 5KW 8KW 8KW 15KW 10KW 15KW 8KW ...

Page 47: ... 0 4 125 0 5 150 0 6 200 0 8 250 1 0 0 0 25 0 1 37 0 15 50 0 2 75 0 3 100 0 4 125 0 5 150 0 6 200 0 8 250 1 0 0 0 25 0 1 37 0 15 50 0 2 75 0 3 100 0 4 125 0 5 150 0 6 200 0 8 250 1 0 Static pressure Pa in WC 0 0 25 0 1 37 0 15 50 0 2 75 0 3 100 0 4 125 0 5 150 0 6 200 0 8 250 1 0 0 0 25 0 1 37 0 15 50 0 2 75 0 3 100 0 4 125 0 5 150 0 6 200 0 8 250 1 0 0 0 25 0 1 37 0 15 50 0 2 75 0 3 100 0 4 125 0...

Page 48: ...0 0 8 0 0 8 Throttle type EEV for cooling Indoor unit Dimension WxDxH in 21 02x17 52x45 00 21 02x17 52x45 00 21 02x21 02x49 02 21 02x21 02x49 02 21 02x21 02x49 02 21 02x24 49x52 99 Packing WxDxH in 25 20x20 87x50 39 25 20x20 87x50 39 25 20x24 41x54 33 25 20x24 41x54 33 25 20x24 41x54 33 25 20x27 76x58 27 Net gross weight lbs 105 82 129 41 105 60 127 43 129 19 155 64 129 19 155 64 130 51 156 31 162...

Page 49: ...eating at 5 F 15 C Capacity Btu h 9550 17000 20000 18600 27000 29000 COP W W 1 85 1 75 1 95 1 80 1 75 1 80 Outdoor noise level Sound pressure dB A 54 0 56 5 61 5 61 0 59 0 61 0 Throttle type EEV for Heating Outdoor unit Dimension WxDxH in 31 69x12 99x21 81 35 04x13 46x26 50 37 24x16 14x31 89 37 24x16 14x31 89 37 48x16 34x52 48 37 48x16 34x52 48 Packing WxDxH in 36 02x14 57x24 21 39 17x15 67x29 13 ...

Page 50: ... Btu W 9 0 10 0 8 4 8 5 8 5 Heating at 5 F 15 C Capacity Btu h 19000 24000 28500 43300 47000 COP W W 1 90 1 80 1 95 1 80 1 88 Outdoor noise level Sound pressure dB A 58 0 64 0 61 5 64 0 64 0 Throttle type EEV for Heating Outdoor unit Dimension WxDxH in 35 04x13 46x26 50 37 24x16 14x31 89 37 24x16 14x31 89 37 48x16 34x52 48 37 48x16 34x52 48 Packing WxDxH in 39 17x15 67x29 13 42 91x19 69x34 84 42 9...

Page 51: ... the vacuum pump 7 Wait for 5 minutes then check that there has been no change in system pressure 8 If there is a significant change in system pressure check for leaks If there is no change in system pressure unscrew the cap from the packed valve high pressure valve Pressure rises but becomes stable below 1000 Microns ok to open valves Pressure becomes stable above 1000 but below 2000 Microns ther...

Page 52: ...of socket Failure to do so or use of stepped service valve tool may result in stripped and unusable socket CAUTION DO NOT mix refrigerant types Liquid Side Diameter Ø9 52mm 3 8in R 410A Metering device in the indoor unit Total pipe length standard pipe length x65g 0 69oZ m ft R 410A Metering device in the outdoor unit Total pipe length standard pipe length x30g 0 32oZ m ft 10 Watch the Pressure Ga...

Page 53: ... correctly CAUTION Failure to perform the test run may result in unit damage property damage or personal injury b Check to see that the drainage system is unimpeded and draining smoothly c Ensure there is no vibration or abnormal noise during operation 5 For the Outdoor Unit a Check to see if the refrigeration system is leaking b Make sure there is no vibration or abnormal noise during operation c...

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