Midea MACHU-H18B-2A Installation Manual
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Midea MACHU-H18B-2A Installation Manual

Midea MACHU-H18B-2A Installation Manual

Universal air handler
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NOTE
Read the entire instruction manual before
starting the installation. Images are for illustration
purposes only. Actual models may differ slightly.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Installation Manual
Universal Air Handler
For 18,000 - 54,000 BTU Systems
Units Covered In This Manual
BTUH
VOLTAGE/ PHASE
18,000
208/230-1
24,000
208/230-1
30,000
208/230-1
33,000
208/230-1
36,000
208/230-1
48,000
208/230-1
54,000
208/230-1
AIR HANDLER MODEL
MACHU-H18B-2A
MACHU-H24B-2A
MACHU-H30B-2A
MACHU-H36B-2A
MASHS-H36B-2A
MASHS-H48B-2A
MASHS-H60B-2A

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Summary of Contents for Midea MACHU-H18B-2A

  • Page 1 Units Covered In This Manual NOTE Read the entire instruction manual before BTUH VOLTAGE/ PHASE AIR HANDLER MODEL starting the installation. Images are for illustration 18,000 208/230-1 MACHU-H18B-2A purposes only. Actual models may differ slightly. 24,000 208/230-1 MACHU-H24B-2A 30,000 208/230-1 MACHU-H30B-2A 33,000...
  • Page 2 Table of Contents Safety Precautions ............... 3 Outdoor Installation ..............25 Table S-1: Allowed Static Pressure Ranges ........5 Step 4 - Installation Location ...............25 Table S-2: Approved Matchups ............5 Fig. 4-1: Clearance Dimensions ..........25 Table S-3: Minimum Room Area Requirements ......5 Fig.

  • Page 3: Safety Precautions

    Safety Precautions capabilities, or lack of experience and knowledge, unless they have been given supervision or instruction concerning use of the appliance by a person responsible for their safety. It is really important you read Safety Precautions Before Children should be supervised to ensure that they do not Operation and Installation Incorrect installation due to play with the appliance.
  • Page 4 unit’s weight, or the installation is not done properly, into a refrigerant circuit should hold a currently valid the unit may drop and cause serious injury and damage. certificate from an industry-accredited assessment • Install drainage piping according to the instructions authority, which authorizes their competence to handle in this manual.
  • Page 5 - That pipe work shall be protected from physical damage. Model Indoor unit Outdoor unit - Where refrigerant pipes shall comply with national gas MO1ES-H18B-2A regulations. 18K(208/230V) MACHU-H18B-2A MO1HS-H18B-2A - That mechanical connections shall be accessible for MO1ES-H24B-2A maintenance purposes. 24K(208/230V) MACHU-H24B-2A MO1HS-H24B-2A - Be more careful that foreign matter (oil, water, etc.) does...
  • Page 6 • the type of ventilation of the location or the appliance. by a certificate. The training of these procedures is carried • piping material, pipe routing, and installation shall include out by national training organizations or manufacturers that protection from physical damage in operation and service, are accredited to teach the relevant national competency and comply with national and local codes and standards, standards that may be set in legislation.
  • Page 7 guidelines shall be followed. If in doubt consult the the LFL of the refrigerant and shall be calibrated to the manufacturer’s technical department for assistance. The refrigerant employed, and the appropriate percentage following checks shall be applied to installations using of gas (25 % maximum) is confirmed.
  • Page 8 that contamination of different refrigerants does not before recovery takes place. occur when using charging equipment. Hoses or lines g. Start the recovery machine and operate following shall be as short as possible to minimize the amount of instructions. refrigerant contained in them. h.

  • Page 9: Potential Ignition Sources

    stagnate to create a fire or explosion hazard. e. Storage of equipment/appliances - The storage - If appliances are connected via an air duct system of the appliance should be following the applicable to one or more rooms with A2L REFRIGERANTS are regulations or instructions, whichever is more installed in a room with an area less than Amin, that stringent.

  • Page 10: Specifications

    Specifications MACHU-H18B-2A MACHU-H18B-2A MACHU-H24B-2A Product Model MO1ES-H18B-2A MO1HS-H18B-2A MO1ES-H24B-2A Power source 208/230V~ 60Hz, 1Ph Cooling capacity 18000Btu/h 18000Btu/h 24000Btu/h Heating capacity 18000Btu/h 19500Btu/h 25000Btu/h Moisture resistance class IPX4 MACHU-H24B-2A MACHU-H30B-2A MACHU-H36B-2A Product Model MO1HS-H24B-2A MO1BS-H30B-2A MO1HS-H33B-2A Power source 208/230V~ 60Hz, 1Ph...

  • Page 11: Installation Accessories

    Installation Accessories Table A-2: Outdoor Accessories QTY. Part Name Part Image The system is shipped with the following accessories. Use all the installation parts and accessories to install the system. Drain fitting Improper installation may result in water leakage, electrical shock, and fire, or cause the equipment to fail.

  • Page 12: Product Overview

    Product Overview Air outlet Refrigerant Connecting Pipe Drain Outlet Drain Outlet Air inlet Fig. P-1: External Component Location Coil compartment (access panel removed) Upflow drain pan Horizontal drain pan Fig. P-2: Internal Component Location Universal Air Handler...
  • Page 13 Dimensions Table D-1: Dimensions Unit Sizes Duct Opening Area System Size in. (mm) in. (mm) in. (mm) in. (mm) in. (mm) in. (mm) 45 (1,143) 17-1/2 (445) 15-3/4 (400) 49 (1,245) 21 (533) 21 (534) 19-1/4 (490) 10-1/4 (260) 23 (585) 53 (1,346) 24-1/2 (622) 22-7/8 (580)
  • Page 14 Clearances WARNING • If heating elements are added, the distance from the ground must be greater than 18 in. (46 cm). Failure to follow these instructions can result in death, explosion or fire. • Securely install the indoor unit on a structure that can support its weight.

  • Page 15: Installation Requirements

    Installation equivalent sealing method between the plenum and the air handler cabinet. Return air must not be drawn from a room Requirements where this air handler or any gas-fueled appliance (e.g., water heater) or carbon monoxide-producing device (e.g., wood fireplace) is installed. NOTE CAUTION Remove all accessories and packing in the air outlet before...
  • Page 16 important that the duct system be properly designed and the absorption of moisture from the installed. surrounding air into the insulation. The use of flexible duct collars is recommended to minimize • The supply air duct connection should the transmission of vibration/noise into the conditioned be properly sized by using a transition space.

  • Page 17: Installation

    Installation 3. Remove the evaporator cover plate. Step 1 - Mounting the Unit Please follow these steps to perform Vertical down installation and Horizontal right installation: 1. Open the upper cover. Fig. 1-1: Remove Upper Front Panel 2. Open the cover of the electronic control box. 3.
  • Page 18 5. Remove the sensor and detector wires from the coil 6. Remove T1, T2, refrigerant detection sensor wire ties. section. T1: IDU room sensor (T1) T2: IDU coil sensor (T2) 18-24K model Refrigerant detection sensor 30-36K model Fig. 1-6: Remove the Sensor Wire Ties 7.
  • Page 19 8. Adjust the position of the mounting parts. Fig. 1-8: Adjust Mounting Parts Position 9. Reinstall the evaporator and drain pan. Fig. 1-9: Reinstall Evaporator and Drain Pan 10. Reinstall the T1, T2, and sensor plug, and tie together the sensor wires. NOTE The wire body needs to pass through the drain pan’s wire groove and be stuck on the drain pan’s hook.
  • Page 20 11. The evaporator is assembled in place. 15. Reassemble the upper front panels. Fig. 1-11: Assembled Evaporator 12. Use cable ties to attach the room temperature sensor as shown in the figure. Cable Ties Fig. 1-14: Reassemble Upper Cover 16. Reassenble the upper cover and reinstall the filter and the filter cover plate.

  • Page 21: Step 2 - Drain Piping

    Step 2 - Drain Piping CAUTION FOR ALL PIPE INSTALLATION • Insulate all piping to prevent condensation, which could lead to water damage. • The drainpipe drains water away from the unit. If it is bent or installed incorrectly, water may leak, causing a water-level switch to malfunction.

  • Page 22: Step 3 - Refrigerant Piping Connections

    IMPORTANT CAUTION Use refrigeration grade tubing ONLY. No other type of tubing may be used. The use of other types of tubing will The drainpipe outlet should be at least 2 in. (5 cm) above void the manufacturer’s warranty. the ground. If it touches the ground, the unit may become •...
  • Page 23 Cut pipes direction. Once the ends are flared, it is impossible to When preparing refrigerant pipes, take extra care to cut and put them on or change their direction. flare them properly. This will ensure efficient operation and minimize the need for future maintenance. 1.

  • Page 24: Minimum Bend Radius

    Table 3-2: Flare Dimensions/Tightening Torque Pipe Size Outside Diameter Flare Dimensions (A) in. (mm) in. (mm) Ø1/4 (6.35) 11/23 - 23/64 (~9.1) Ø3/8 (9.52) 1/2 - 33/64 (~13.2) Ø1/2 (12.7) 41/64 -31/32 (~16.6) Ø5/8 (15.88) 49/64 - 35/32 (~19.7) Ø3/4 (19.05) Tightening Torque for Flare Nuts Pipe Size Outside Diameter Tightening Torque...

  • Page 25: Outdoor Installation

    Outdoor Installation CAUTION Step 4 - Installation Location Check to make sure there is no refrigerant leak after completing the installation work. NOTE If there is a refrigerant leak, ventilate the area immediately Before Installation and evacuate the system (refer to the Air Evacuation section Before installing the outdoor unit, you must choose an of the outdoor unit manual).

  • Page 26: Step 5 - Install Drain Joint

    Step 5 - Install Drain Joint • Where snowfall is anticipated, take appropriate measures to NOTE prevent ice buildup and PRIOR TO INSTALLATION coil damage. Before bolting the outdoor unit in place, you must install the drain joint at the bottom of the unit. For the units with base pan built-in with multiple holes for proper draining during defrost, the drain joint does not need to be installed.
  • Page 27 2. Fit the rubber seal on the end of the drain joint that will distance between their mounting feet. Prepare the installtion connect to the outdoor unit. base of the unit according to the dimensions in Table 6-1. Fig. 6-1: Unit Dimensions Table 6-1: Outdoor Unit Dimensions Unit: inch (mm) Mounting Dimensions...
  • Page 28 brackets. NOTE 7. Bolt the unit firmly onto the brackets. H=Unit height 8. If allowed, install the unit with rubber gaskets to reduce L=Height of the wall behind the unit vibrations and noise. A=Distance between the unit and the wall CAUTION Make sure that the wall is made of solid brick, concrete, or similarly strong material.

  • Page 29: Step 7 - Power Wiring Connections

    Step 7 - Power Wiring WARNING Connections OUTDOOR UNIT WIRING Before performing any electrical or wiring work, turn off the main power to the system. WARNING Prepare the cable for connection. 1. Mount the outdoor power disconnect. BEFORE PERFORMING ANY ELECTRICAL WORK, READ 2.

  • Page 30: Indoor Unit Wiring

    8. Use the lock nuts to secure the conduit. 9. Reinstall the field wiring cover. CAUTION EQUIPMENT DAMAGE HAZARD Failure to follow this caution may result in equipment damage or improper operation. Be sure to comply with local codes while running wire from the indoor unit to the outdoor unit.
  • Page 31 Step 8 - Specific Wiring Connection Method B: To use a 24V thermostat, you need to refer to the following Methods wiring: WARNING Please refer to the wiring nameplate for the wiring method. Do not connect the power cord to the communication line, as this may damage the system.
  • Page 32 Optional function wiring Fig. 8-6: Humidifier Wiring Humidifier control: To connect a humidifier, utilize the passive signal “WORK” output (CN23) port as well as the R and C wires on the controller, and wire the humidistat and humidifier per the above wiring diagram.
  • Page 33 KEY1 Instructions (For Wired Controller only) • Press KEY1 to enter the forced automatic mode, press KEY1 again to enter the forced cooling mode (LED display FC), and press KEY1 again to shut down. • Long press KEY1 under forced cooling mode (LED display FC) 5s to enter forced defrost mode.

  • Page 34: Dip Switch Definitions

    DIP switch definitions Function Rotary switch Function DIP swich Static pressure DIP swich KEY1 Function DIP swich display Fig 8-10: Dip Switch Layout Universal Air Handler...
  • Page 35 Table 8-3: Function combination table of SW1-1 Function DIP switch settings: The 24 V thermostat mode needs to refer to the following and SW1-4 settings: Stand Alone Or Full Control Type SW4-1 System 000 is the default 000/001/010/011/100/101/ SW4-2 110/111, internal machines with different abilities, electric heating, and PSC classification for use.
  • Page 36 Table 8-4: Indoor Unit Dial Code (continued) Dial Control Function Note Code Scenario Maximum continuous runtime allowed before system automatically stages up capacity to satisfy set point. This adds 1 to SW3-1 30 minutes [Default] 90 minutes 5°F to the user set point in the calculated control point to increase capacity and satisfy user set point Cooling and heating Y/Y2 temperature...

  • Page 37: Step 9 - Air Evacuation

    Table 8-6: Table A Outdoor unit S3 (°F) S3 (°C) Manifold Gauge 500 Microns Compound Pressure gauge gauge High pressure pressure valve valve Pressure hose Charge hose Charge hose Vacuum pump Low pressure valve Fig. 9-1: Manifold Gauge Arrangement 6. Run the vacuum for at least 15 minutes, or until the Compound Meter reads 500 microns.

  • Page 38: Note On Adding Refrigerant

    Test Run 13. Using a hexagonal wrench, fully open both the high-pressure and low-pressure valves. 14. Tighten all valve caps hand-tight plus one flat to CAUTION ensure no leaks. You may tighten it further using a torque wrench if needed. Failure to perform the test run may result in unit damage, NOTE ON ADDING REFRIGERANT property damage, or personal injury.
  • Page 39 Appendix Table AP-1: Air Volume Table External Electric 24 V thermostat Wired controller Airflow Static auxiliary Capacity Fan speed volume Pressure heat DIP Switch 24 V terminal engaged DIP Switch Mode (CFM) Range module Cooling Turbo — SW3-4=ON Y2/Y — Cool Cooling High —...
  • Page 40 External Electric 24 V thermostat Wired controller Airflow Static auxiliary Capacity Fan speed volume Pressure heat DIP Switch 24 V terminal engaged DIP Switch Mode (CFM) Range module Cooling Turbo — SW3-4=ON Y2/Y — Cool 1235 Cooling High — SW3-4=OFF Y2/Y —...
  • Page 41 NOTE The constant airflow volume motor is applied. So, the airflow volume is constant at all ESP within the stated range. Table AP-2: 24 V Signal Chart 24 V input terminal Mode Priority Y/Y2 E/AUX Fan speed Display Cooling stage 1 Cooling stage 2 High Dehumidification 1...
  • Page 42 Table AP-3: Matching With Multi Zone Outdoor Unit When matching with a multi-zone outdoor unit, the indoor unit cannot be started due to the mode conflict in the following cases. Mode of AHU Mode of Other IDU Zones Mode Conflict Unt Cooling Heating/ Electric heat/ Emergency heat Dehumidification...
  • Page 43 3. Remove the terminal block and power wires, loosen the 5. Tighten the mounting screws. screws, and remove the electric auxiliary heating cover. Screws Fig. AP-5: Install Mounting Screws Fig. AP-3: Remove Heat Kit Cover 6. Wire according to the wiring nameplate. Applying the 4.

  • Page 44: Disposal And Recycling

    Trademarks Copyrights & Legal Statement logo, word marks, trade name, trade dress, and all versions thereof are valuable assets of Midea Group and/or its affiliates (“Midea”), to which Midea owns trademarks, copyrights, and other intellectual property rights, and all goodwill derived from using any part of a Midea trademark.
  • Page 45 This page is intentionally left blank. Universal Air Handler...
  • Page 46 Product Warranty Information The Warranty Registration below is a requirement to print a warranty certificate. You’re not mandated to register your products to enjoy the Midea Standard Warranty; however, registration is highly recommended. Registering your warranty within 60 days ensures easy access to support and service when needed.

This manual is also suitable for:

Machu-h24b-2aMachu-h30b-2aMachu-h36b-2aMashs-h36b-2aMashs-h48b-2aMashs-h60b-2a

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