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For 18,000 - 36,000 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
Wall Mounted Air Handler
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
AIR HANDLER MODEL
PHASE
MAWHE-H18B-2A
MAWHE-H24B-2A
MAWHE-H30B-2A
MAWHE-H36B-2A
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Summary of Contents for Midea EVOX Extreme MAWHE-H18B-2A
- Page 1 Installation Manual Wall Mounted Air Handler For 18,000 - 36,000 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. 5-5: Open the Upper Front Panel ........25 Table S-1: Allowed Static Pressure Ranges ........5 Fig. 5-6: Power Wiring Location ..........26 Table S-2: Approved Matchups ............5 Step 6 - Specific Wiring Methods ............26 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 with the user, especially for the hidden power wire. An the information for details in the “indoor unit installation” electron probe can be used to test whether a wire is and “outdoor unit installation” sections. passing by at the drilling location, to prevent physical injury or death caused by insulation broken cords.
- Page 5 Table S-2: Approved Matchups open flames, an operating gas appliance, or an operating electric heater). Capacity 6. Be careful that foreign matter(oil, water,etc) does not Product (208/230 Air Handler Unit Outdoor Unit enter the piping. Also, when storing the piping, securely Type seal the opening by pinching, taping, etc.
- Page 6 - That the installation of pipe work shall be kept to a insulation; minimum. • that precautions shall be taken to avoid excessive vibration - That pipe work shall be protected from physical damage. or pulsation; - Where refrigerant pipes shall comply with national gas •...
- Page 7 minimize the risk of flammable gas or vapor being present are inherently resistant to being corroded or are suitably while the work is being performed. protected against being so corroded. 6. General work area 12. Checks to electrical devices All maintenance staff and others working in the local area Repair and maintenance of electrical components shall should be instructed on the nature of the work being carried include initial safety checks and component inspection...
- Page 8 15. Removal and evacuation recovered safely. Before the task is carried out, an oil and When breaking into the refrigerant circuit to make repairs refrigerant sample shall be taken in case analysis is required - or for any other purpose conventional procedures before the re-use of recovered refrigerant.
- Page 9 flammable refrigerant. If in doubt, the manufacturer 21. Unventilated areas should be consulted. In addition, a set of calibrated - An unventilated area where the appliance using weighing scales shall be available and in good working FLAMMABLE REFRIGERANTS is installed shall be so order.
- Page 10 Installation Accessories Unpacking Carefully unpack the unit and inspect the contents for The system is shipped with the following accessories. Use all damage. If any damage is found at the time of delivery, the installation parts and accessories to install the system. proper notification and claims should be made with the Improper installation may result in water leakage, electrical carrier.
- Page 11 Product Overview Fig. P-1: Component Location EVOX Extreme Heat Wall Mounted Air Handler...
- Page 12 Dimensions Table D-1: Dimensions Unit Sizes Duct Opening Area System Width (W) Depth (D) Height (H) Supply Width (W1) Supply Depth (D1) Weight Size in. (mm) in. (mm) in. (mm) in. (mm) in. (mm) lbs. (kg) 20-1/4 (580) 15-3/4 (495) 36-1/2 (1,090) 17 1/2 (444.5) 10-1/2 (266.7)
- Page 13 Clearances Location The small air handler should be centrally located and may be installed in a closet, alcove, utility room, or basement. Minimum clearances must be met. The air handler comes 20 in. standard with two different options for mounting, wall mount or frame mount.
- Page 14 Installation Requirements CAUTION Install the indoor and outdoor units, cables and wires at least • If heating elements are added, the distance from the 3-1/5 ft. (1 m) from televisions or radios to prevent static or ground must be greater than 18 in. (46 cm). Failure to image distortion.
- Page 15 Installation Step 1 - Mounting the Unit Wall Mount Fig. 1-1: Wall Mounting Frame Mount Fig. 1-2: Frame Mount EVOX Extreme Heat Wall Mounted Air Handler...
- Page 16 Cardboard Template for Pre-positioning 1. Cut the template from the shipping cardboard box with the mounting tabs along the dotted lines. Fig. 1-5: Drill Holes Using the Template 4. Remove the wall brackets from the product. Fig. 1-3: Cut the Template Off the Box 2.
- Page 17 Instructions for Hanging the Unit on the Support Frame 3. The adapter tube of the product is securely attached to and Using the Auxiliary Installation Hole. the body using two wrenches. 1. Attach the unit to the stand that has already been constructed.
- Page 18 walkways. ＞ 1 in. Minimum • DO NOT pull the drainpipe forcefully. This could disconnect it. NOTE Duct If installed above a finished living space, a secondary drain pan (as required by many building codes), must be installed under the entire unit and its condensate drain line Total 4.9 ft./1.5 m Minimum must be routed to a location such that the user will see the condensate discharge.
- Page 19 Table 3-1: Airflow Performance using a transition to match the unit opening. • All ducts should be suspended using flexible hangers Setting External Static Pressure (in. w.c.) and never fastened directly to the structure. Model Watts • This unit is not designed for non-ducted (free blow) Turbo applications.
- Page 20 Step 4 - Refrigerant Piping Insulate both the gas and liquid piping to prevent condensation. Connections IMPORTANT Use refrigeration grade tubing ONLY. No other type of WARNING tubing may be used. The use of other types of tubing will void the manufacturer’s warranty. All field piping must be completed by a licensed technician •...
- Page 21 Cut pipes When preparing refrigerant pipes, take extra care to cut and flare them properly. This will ensure efficient operation and minimize the need for future maintenance. 1. Measure the distance between the indoor and outdoor units. 2. Using a pipe cutter, cut the pipe a little longer than the measured distance.
- Page 22 Tightening Torque for Flare Nuts tubing. e. While firmly gripping the nut, use a torque wrench to Pipe Size Outside Diameter Tightening Torque tighten the flare nut according to the torque values in. (mm) ft. - lbs. listed in Table 3-2. Ø1/4 (6.35) 13.0 - 18.0 Ensure to wrap insulation around the piping.
- Page 23 Preset the nitrogen regulator to 500 psi. The A2L Detection Sensor is attached to a wiring harness d. Slowly pressurize the line set until the low side that connects the sensor to the control board. gauge reads 500 psi. Do not exceed 500 psi. Close all the valves on the nitrogen tank and gauges.
- Page 24 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 115/208/230 V-1* 15.0 *The default voltage of the units is 208-203 V. If you need to switch to 115 V, please refer to the Installation Guide For AHU Using 115 V Power Supply in appendix.
- Page 25 Please pay attention to the safety of the alignment when 7. Use the lock nuts to secure the conduit. installing the line control or thermostat and separate the 8. Reinstall the field wiring cover. strong and weak power alignment WARNING WARNING EQUIPMENT DAMAGE HAZARD OUTDOOR UNIT WIRING...
- Page 26 Connect the wires to the terminals. must not be loose or pull on the U-lugs. 1. Thread the power cable and the signal cable through 6. Reattach the electric box cover. the wire outlet 2. Match the wire colors/labels with the labels on the CAUTION terminal block.
- Page 27 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. Every wire must be connected firmly. Loose wiring may cause the terminal to overheat or result in unit malfunction.
- Page 28 • The IDU and ODU need separate power or are from the ODU. See Step 5 - 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 29 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 30 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 Fig. 6-4: Never Connect 24 V to S1-S2 S4-1: Default ON: For single-stage supplemental heat, W1 and W2 are connected.
- Page 31 Optional function wiring Y/Y2 COM OY2 OY1 OB/O Fig. 6-11: Wiring for 1H and 1C Thermostat COM OY2 OY1 OB/O Y/Y2 Fig. 6-12: Wiring for 1H and 1C Thermostat NOTE This is the least preferred method of control wiring and should only be used in emergencies.
- Page 32 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 33 DIP switch definitions Fig 6-18: Dip Switch Layout EVOX Extreme Heat Wall Mounted Air Handler...
- Page 34 Table 6-5: 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 35 Table 6-6: 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 36 Plan 1 Plan 2 Table 6-8: Table A S3 (°F) S3 (°C) Fig. 8-2: Insulate All Connections • Gas and liquid pipes must be insulated separately. Insulating them together will decrease the performance of the air conditioner. • The insulation material at the joint pipe shall be 2-4 in./5- 10 cm longer than the gap of the insulation material.
- Page 37 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 38 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 39 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 40 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 Dehumidification 2 Heat pump stage 1 Heat pump stage 2 High Heat pump stage 2 High Electric heater kit 1 Turbo...
- Page 41 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 42 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 43 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 44 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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