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For 18,000 - 60,000 BTU Systems
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
Air Handler
Gen2
Units Covered In This Manual
SYSTEM
VOLTAGE/
BTUH
TONS
1.5
18,000
115/208/230-1
2.0
24,000
115/208/230-1
2.5
30,000
115/208/230-1
3.0
36,000
115/208/230-1
4.0
48,000
115/208/230-1
5.0
60,000
115/208/230-1
AIR HANDLER MODEL
PHASE
MAUHE-H18B-2A
MAUHE-H24B-2A
MAUHE-H30B-2A
MAUHE-H36B-2A
MAUHE-H48B-2A
MAUHE-H60B-2A
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Summary of Contents for Midea EVOX MAUHE-H18B-2A
- Page 1 Installation Manual Air Handler Gen2 For 18,000 - 60,000 BTU Systems Units Covered In This Manual NOTE Read the entire instruction manual before starting the SYSTEM VOLTAGE/ BTUH AIR HANDLER MODEL installation. Images are for illustration purposes only. Actual TONS PHASE models may differ slightly.
- Page 2 Table of Contents Safety Considerations ..............3 Fig. 4-3: Field Wiring Conduit Location .........26 Table S-1: Allowed Static Pressure Ranges ........4 Fig. 4-6: Power Wiring Location ..........27 Table S-2: Approved Matchups ............5 Step 5 - Specific Wiring Methods ............27 Table S-3: Minimum Room Area Requirements ......
- Page 3 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 • For the units that have a wireless network function, assessment specification. USB device access, replacement, and maintenance 3. Maintenance and repair requiring the assistance of operations must be carried out by professional staff. other skilled personnel shall be carried out under •...
- Page 5 machine you purchased. The height of the room cannot a refrigerant circuit should hold a current valid certificate be less than 7.3 ft./2.2 m, and the minimum room area for from an industry-accredited assessment authority, which operating or storage should be as specified in the following authorizes their competence to handle refrigerants safely table: in accordance with an industry-recognized assessment...
- Page 6 • that protection devices, piping, and fittings shall be • breaking into the refrigerating circuit; protected as far as possible against adverse environmental • opening of sealed components; effects, for example, the danger of water collecting and • opening of ventilated enclosures. freezing in relief pipes or the accumulation of dirt and 4.
- Page 7 installed; avoided as the chlorine may react with the refrigerant • the ventilation machinery and outlets are operating and corrode the copper pipe-work. adequately and are not obstructed; NOTE • if an indirect refrigerating circuit is being used, the Examples of leak-detection fluids are secondary circuits shall be checked for the presence of - bubble method, refrigerant;...
- Page 8 • Ensure that the refrigeration system is earthed before When transferring refrigerant into cylinders, ensure charging the system with refrigerant. that only appropriate refrigerant recovery cylinders are • Label the system when charging is complete(if not employed. Ensure that the correct number of cylinders already).
- Page 9 e. Storage of equipment/appliances - The storage suitable with the refrigerant shall be installed in of the appliance should be following the applicable connecting ductwork. regulations or instructions, whichever is more - For duct-connected appliances, false ceilings or stringent. drop ceilings may be used as a return air plenum if Storage of packed (unsold) equipment - Storage a REFRIGERANT DETECTION SYSTEM is provided in package protection should be constructed in such...
- Page 10 Installation Accessories Table A-2: Optional 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. Remote controller Improper installation may result in water leakage, electrical shock, and fire, or cause the equipment to fail.
- Page 11 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 EVOX G2 Extreme Heat Air Handler...
- Page 12 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 13 Clearances to change the direction of the evaporator. 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. •...
- Page 14 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 15 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 16 Installation 2. Open the upper front panel. See Fig. 1-1. 3. Remove the evaporator cover plate. Step 1 - Mounting the Unit The units come from the factory set up for Upflow and Horizontal Right configurations. Connecting the drainage pipes and wiring for Downflow and Horizontal Left applications.
- Page 17 18-24K model Refrigerant detection sensor 30-36K model Fig. 1-6: Remove the Sensor Wire Ties 6. Take out the evaporator and drain pan and rotate 180°. Refrigerant detection sensor 48-60K model Refrigerant detection sensor Fig. 1-5: T1 Sensor Location by Model Fig.
- Page 18 Fig. 1-8: Adjust Mounting Parts Position 8. Reinstall the evaporator and drain pan. Cut the foam gasket. Remove knockouts Hook the wire into the buckle and go down from the wire slot. Fig. 1-9: Reinstall Evaporator and Drain Pan Replace foam gasket. 9.
- Page 19 10. The evaporator is assembled in place. 14. Reassemble the upper front panels. Fig. 1-11: Assembled Evaporator 11. Use cable ties to attach the room temperature sensor as shown in the figure. Cable Ties Fig. 1-14: Reassemble Upper Cover 15. Reassenble the upper cover and reinstall the filter and the filter cover plate.
- Page 20 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 21 NOTE CAUTION Pipes are not included in the accessories, and you need to purchase them separately from the local dealer. The drainpipe outlet should be at least 2 in. (5 cm) above the ground. If it touches the ground, the unit may become CAUTION blocked and malfunction.
- Page 22 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 23 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 24 If there is a refrigerant leak, ventilate the area immediately Use a nitrogen regulator. and evacuate the system (refer to the Air Evacuation section Attach the low side gauge hose to the 5/16” Schrader of the outdoor unit manual). valve on the outdoor unit service valve. b.
- Page 25 Confirmation of Indoor Unit Table CIU-1: Units Without Electric Heat Branch Circuit Unit Volts-Phase Rated Current Min. Wire Size Size (Minimum Circuit Ampacity) Fuse/CKT BKR Amps 115 V: 4.4 A 115 V: 5.5 A 208/230 V: 2.5 A 208/230 V: 3.5 A 115 V: 6.4A 115 V: 8.0 A 115/208/230 V-1*...
- Page 26 6. Properly connect both the power supply and control NOTE lines to the terminal block per the connection diagram The diagrams are for explanation purposes only. Your for the appropriate unit capacity and voltage. machine may be slightly different. The actual diagram shall 7.
- Page 27 Step 5 - Specific Wiring Methods 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. Table 5-1: Communication Wiring Sizes Option Communication Type Reocommended Cable Size Non-Polarity RS485 Communication 20 AWG (stranded shielded)
- Page 28 Table 5-2: Wiring Color Guide INDOOR OUTDOOR THERMOSTAT UNIT UNIT Heat - 2nd WHITE stage Emergency Heat - 1st W1/E BLACK stage 4 Way Valve ORANGE Cool - 2nd BROWN stage Cool - 1st YELLOW stage GREEN GRAY Power BLUE Common Power PURPLE...
- Page 29 • 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 30 NOTE For Brand AHU+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 31 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. 5-4: 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 32 Optional function wiring Y/Y2 COM OY2 OY1 OB/O Fig. 5-11: Wiring for 1H and 1C Thermostat Y/Y2 COM OY2 OY1 OB/O Fig. 5-12: Wiring for 1H and 1C Thermostat NOTE This is the least preferred method of control wiring and should only be used in emergencies.
- Page 33 Humidifier control: KEY1 Instructions (For Wired Controller only) To connect a humidifier, utilize the passive signal “WORK” • Press KEY1 to enter the forced automatic mode, press output (CN23) port as well as the R and C wires on the KEY1 again to enter the forced cooling mode (LED controller, and wire the humidistat and humidifier per the display FC), and press KEY1 again to shut down.
- Page 34 DIP switch definitions Fig 5-18: Dip Switch Layout EVOX G2 Extreme Heat Air Handler...
- Page 35 Table 5-5: 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 (S1+S2) / 24 V controller / connection Auto 24 V (S1+S2) / 24 V...
- Page 36 Table 5-6: 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 Table 5-8: Table A S3 (°F) S3 (°C) Fig. 7-2: Insulate All Connections • Gas and liquid pipes must be insulated separately. Insulating them together will decrease the performance Step 6 - Air Evacuation of the air conditioner. • The insulation material at the joint pipe shall be 2-4 in./5- Please refer to the outdoor unit manual for details.
- Page 38 Test Run CAUTION Failure to perform the test run may result in unit damage, property damage, or personal injury. Before the Test Run A test run must be performed after the entire system has been completely installed. Confirm the following points before performing the test: a.
- 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 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 43 Installation Guide For AHU Using 115 V Power Supply 1. Open the upper cover. 4. Remove the two screws in the electric cabinet and take out the control box. Fig. AP-4: Remove the Conrol Box Fig. AP-1: Remove Upper Cover 5.
- Page 44 7. Take the 24 V transformer connection wire out from the 8. Replace the electronic control box in the AHU, attach it accessory package. Connect the red connector to the with the screws that were removed in Step 4, and insert 24 V transformer and the blue connector to the control the wire body properly.
- Page 45 This page is intentionally left blank.
- 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.
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