Midea A-Coil MAAHE-H24B-AA Installation Manual

Evaporator a-coil horizontal-vertical duct

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Owner's manual (10 pages)

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For 18,000 - 60,000 BTU Systems

NOTE

You'll find many helpful hints on how to use and maintain

your air conditioner properly. Just a little preventive care can

save you a great deal of time and money over the life of

your air conditioner. These instructions may not cover every

possible condition of use, so common sense and attention

to safety are required when installing, operating, and

maintaining this product.

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

Installation Manual

Evaporator A-Coil

Horizontal-Vertical Duct

Units Covered In This Manual

A-COIL MODEL

MAAHE-H24B-AA

MAAHE-H24B-BA

MAAHE-H36B-AA

MAAHE-H36B-BA

MAAHE-H36B-CA

MAAHE-H60B-CA

MAAHE-H60B-DA

VOLTAGE, PHASE, Hz

24, 1, 60

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Summary of Contents for Midea A-Coil MAAHE-H24B-AA

Page 1 Installation Manual Evaporator A-Coil Horizontal-Vertical Duct For 18,000 - 60,000 BTU Systems Units Covered In This Manual NOTE You’ll find many helpful hints on how to use and maintain A-COIL MODEL VOLTAGE, PHASE, Hz your air conditioner properly. Just a little preventive care can MAAHE-H24B-AA 24, 1, 60 save you a great deal of time and money over the life of...
Page 2: Table Of Contents
Table of Contents Fig. 5-8: Signal Wiring Location ..........22 Safety Considerations ..............3 Table 5-2: Inputs ...................23 Table S-1: Allowed Static Pressure Ranges ........5 Table 5-3: Communication ...............23 Table S-2: Approved Matchups ............5 Table 5-4: Outputs ................23 Table S-3: Minimum Room Area Requirements ......6 Fig.
Page 3: Safety Considerations
Safety Considerations 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. Children should be supervised to ensure that they do not WARNING play with the appliance.
Page 4: Electrical Warnings
in this manual. Improper drainage may cause water terminal to heat up, catch fire, or cause electric shock. damage to your home and property. • External disconnect shall be incorporated in installed • For units that have an auxiliary electric heater, do not wiring as per national and local codes.
Page 5 3. Maintenance and repair requiring the assistance of For R454B refrigerant charge amount and minimum other skilled personnel shall be carried out under room area: the supervision of a person competent in the use of The machine you purchased may be one of the types in the flammable refrigerants.
Page 6: Airflow
Table S-3: Minimum Room Area Requirements - Be careful that foreign matter (oil, water, etc.) does not enter the piping. Also, when storing the piping, securely Mc or Mc or Mc or Mc or MREL TAmin TAmin TAmin TAmin seal the opening by pinching, taping, etc. MREL MREL MREL...
Page 7 indicated by the test gauge, with test gauge resolution equipment or any associated parts, appropriate fire not exceeding 5% of the test pressure. extinguishing equipment shall be available to hand. Have a dry c. During the evacuation test, after achieving a vacuum powder or CO fire extinguisher adjacent to the charging area.
Page 8 that capacitors are discharged: this shall be done safely to • safely remove refrigerant following local and national avoid the possibility of sparking; regulations; that no live electrical components and wiring are exposed • evacuate; while charging, recovering, or purging the system; •...
Page 9: Potential Ignition Sources
a. Become familiar with the equipment and its operation. weighing scales shall be available and in good working b. Isolate system electrically order. Hoses shall be complete with leak-free disconnect c. Before attempting the procedure ensure that: couplings and in good condition. •...
Page 10 instructions. e. Storage of packed (unsold) equipment Storage package protection should be constructed such that mechanical damage to the equipment inside the package will not cause a leak of the refrigerant charge. The maximum number of pieces of equipment permitted to be stored together will be determined by local regulations.
Page 11: Installation Accessories
Installation Accessories Air outlet Air outlet The system is shipped with the following accessories. Use all the installation parts and accessories to install the system. Improper installation may result in water leakage, electrical shock, and fire, or cause the equipment to fail. Keep the installation manual in a safe place and do not discard any other accessories until the installation work has been completed.
Page 12: Product Overview
Product Overview R454B refrigerant sensor Duct Wired Controller A-COIL Mini Interface Removable Cover Coil Plate for Inspection and Repair MAAHE-H60B-CA Furnace Room temperature sensor (T1) (Installed in the gas furnacereturn air outlet) Fig. P-1: Component Location WARNING Fig. P-2: Refrigerant Leak Sensor Location There must be an airtight seal between the bottom of the A-coil and the return air plenum.
Page 13: Dimensions
Dimensions Fig. D-1: Unit Dimensions Table D-1: Dimensions 24-A 36-A 24-B 36-B 36-C 60-D Dimensions 14-1/2 368.3 14-1/2 368.3 17-1/2 444.5 17-1/2 444.5 24-1/2 622.3 23-9/16 23-1/2 13-1/4 13-1/4 16-1/4 19-3/4 19.7 501.7 23-1/4 590.8 Fig. D-2: MAAHE-H60B-CA Unit Dimensions EVOX A-Coil Evaporator...
Page 14: Clearances
Clearances Installation Directions Front of unit Top View (including air duct) MAAHE-H60B-CA Front View (including air duct) Fig. C-1: Clearance Dimensions Following clearances should be provided during installation • Maintenance and service access, including coil cleaning and coil assembly removal •...
Page 15: Installation Requirements
Installation WARNING Requirements THE UNIT MUST BE INSTALLED IN A LOCATION THAT MEETS THE FOLLOWING REQUIREMENTS: CAUTION Install the indoor and outdoor units, cables and wires at least 3-1/5 ft. (1 m) from televisions or radios to prevent static or image distortion.
Page 16: Installation
Installation there is a chance for water to blow off. In that case, it is recommended that a 4 in. minimum field-supplied adapter Step 1 - Install the A-Coil UPFLOW COIL INSTALLATION The cased coil is designed to fit furnaces of the same width. 1.
Page 17: Horizontal Left Installation
connection to the condensate pan to prevent condensate from overflowing the drain pan. Prime all traps, test for leaks and insulate traps and lines if located above a living area. Fig. 1-3: Use an Attachment Plate with screws 2. Use self-tapping screws to mount attachment plates to the coil casing.
Page 18: Step 3 - Ductwork
Step 3 - Ductwork Table 3-1: Airflow Performance Outdoor FLANGED MOUNTING Model Minimum Maximum Unit (ton) 1. Use a folding tool and hand seamer to fold up the flange. MAAHE-H24B-AA 1 1/2 MAAHE-H24B-AA MAAHE-H24B-BA 1 1/2 MAAHE-H24B-BA MAAHE-H36B-AA 2 1/2 1000 MAAHE-H36B-AA 1050...
Page 19 Table 4-1: Piping Sizes System Size Maximum Piping Length 98.4 (30) 164 (50) 164 (50) 246 (75) Minimum Piping Length 10 (3) Max. outdoor-indoor height difference 65.6 (20) 82 (25) 82 (25) 98.4 (30) ft. (m) (OU higher than IU) Max.
Page 20: Step 5 - Wiring Connections
an air seal around the tube. Reinstall the cabinet door. • Never touch the electrical components soon after the power supply has been turned off to avoid getting an electric shock. After turning off the power, always wait CAUTION 10 minutes or more before you touch the electrical Failure to follow this caution may result in product components.
Page 21 Fig. 5-5: Open the Cover 5. Dismantling the control box - Using a screwdriver, pull at the two positions shown in Fig. 5-5. Fig. 5-2: Vertical Coil Installation 2. Installed on the side of the coil. (Vertical mounting, you can choose left or right) Fig.
Page 22 Table 5-1: Communication Wiring Sizes amperes (kVA); Su is the burning velocity of a refrigerant in centimeters per second (cm/s). Option Communication Type Reocommended Cable Size Detection of a leak shall turn on the indoor fan at the highest available speed or turn it on to not less than minimum Non-Polarity RS485 Communication 20 AWG (stranded shielded)
Page 23 Table 5-2: Inputs Input Type Input Rating Terminals Recommend Wire Range / Torque Power Input 24 V ac, 60 Hz, 300 mA, Class 2 Terminal Block CN1-3(R), CN1- 2(C) 14-22 AWG / 0.5 N·m Remote Control Signal Input 12 V DC, SELV 14-22 AWG / 0.5 N·m Table 5-3: Communication Recommend Wire Range...
Page 24: Step 6 - Specific Wiring Methods
Control signals to the furnace are the standard thermostat control signals R, C, OW1, OW2, OG, OY1, and OY2. Table 5-4: Control Signals To The Furnace Connector Usage Provides 24VAC power from the furnace to the board. The 24VAC common wire between the furnace and the board. The first stage of the furnace command line from the board to the furnace.
Page 25: Scenario 1: Evox Heat Pump And A-Coil 3Rd Party 24 V
• The IDU and ODU need separate power or are from the ODU. See Step 4 - Power Wiring Connections. • IDU and ODU need 2 non-polarity (5 V RS485 S1 and S2 communication) • IDU and Midea wired controller (HA & HB with 20 VDC) NOTE HA &...
Page 26: Scenario 3: Self-Adapt Mode With 3Rd Party Equipment
NOTE For Brand A-Coil+Midea ODU, the 24V thermostat needs to be connected to a mainboard with a refrigerant sensor, and it should be able to cut off power to the outdoor unit in case of refrigerant leakage. Otherwise, there will be a risk of refrigerant leakage.
Page 27 24 V must never be connected to S1 – S2. All wiring must be in compliance with the above scenarios. Incorrect wiring will cause irreversible damage to the control. Fig. 6-4: Never Connect 24 V to S1-S2 S4-1: Default ON: For single-stage supplemental heat, W1 and W2 are connected. OFF: W1 and W2 are controlled independently for dual-stage supplemental heat.
Page 28 NOTE CN43 terminals OC of A-COIL Mini Interface must be connected to the outdoor unit when the full 24V communication scheme is applied. That will stop the operation of the outdoor unit for safety if the refrigerant leakage happens. Fig. 6-9: Wiring for 2H and 2C Thermostat INDOOR UNIT OUTDOOR UNIT Fig.
Page 29: Dip Switch Definitions
DIP Switch Definitions Fig 6-12: Dip Switch Layout EVOX A-Coil Evaporator...
Page 30: Sw1-4
Table 6-2: 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: IDU & ODU Control Type Note Connection Wired controller / (S1+S2) / 24 V Auto 24 V connection Discovery...
Page 31: Step 7 - Insulate The Piping
Table 6-3: Indoor Unit Dial Code (continued) Dial Control Function Note Code Scenario Temperature differential to active second- SW3-3 stage furnace heating for furnace only or 37°F (3°C) [Default] 35°F (2°C) HP+ furnace mode. For dual-stage supplemental [Default] For single-stage supplemental SW4-1 Default ON heat, W1 and W2 are controlled...
Page 32: Test Run
the drainage test. a. Ensure the drainpipe flows smoothly. New buildings • There should be no insulation gap between the should perform this test before finishing the ceiling. insulation material. b. Turn on the main power switch and run the air Test Run conditioner in COOL mode.
Page 33 Table TS-1: Common Issues Issue Possible Causes The Unit has a 3-minute protection feature that prevents the unit from overloading. The unit cannot be restarted within three minutes of being turned off. Cooling and Heating Models: If the Operation light and PRE-DEF (Pre-heating/ Defrost) The unit does not turn on when pressing indicators are lit up, the outdoor temperature is too cold, and the unit’s anti-cold wind is the ON/OFF button...
Page 34 When troubles occur, please check the following points before contacting a repair company. Table TS-2: Troubleshooting Problem Possible Causes Solution The temperature setting may be higher than the ambient room Lower the temperature setting temperature The heat exchanger on the indoor Clean the affected heat exchanger or outdoor unit is dirty The air filter is dirty...
Page 35: Appendix
Appendix Table AP-1: 24 V Signal Chart (Cooling & Heating) Mode Priority Y/Y2 E/AUX Display Cooling stage 1 Cooling stage 2 Dehumidification 1 Dehumidification 2 Heat pump stage 1 Heat pump stage 2 Heat pump stage 2 Furnace Furnace Furnace Furnace Furnace Furnace...
Page 36 Table AP-2: 24 V Signal Chart (Cooling Only) Mode Priority Y/Y2 E/AUX Display Cooling stage 1 Cooling stage 2 Dehumidification 1 Dehumidification 2 Furnace Furnace Furnace Furnace Furnace Furnace Furnace Furnace Furnace Furnace Furnace Furnace Furnace Furnace Furnace Furnace Furnace Furnace Furnace Note:...
Page 37: Indoor Unit Diagnostic Guide
Indoor Unit Diagnostic Guide For ease of service, systems are equipped with diagnostic code display LEDs on the indoor and outdoor units. Outdoor diagnostics are displayed on the outdoor unit microprocessor board. The indoor unit may display a few error codes that might relate to the outdoor unit’s problems.
Page 38 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.

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