Midea 40MBAA Installation Instructions Manual
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Midea 40MBAA Installation Instructions Manual

Midea 40MBAA Installation Instructions Manual

40mbaa air handler unit ductless system
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40MBAA
Fig. 1 - Air Handler
NOTE: Read the entire instruction manual before starting the
installation.

TABLE OF CONTENTS

SAFETY CONSIDERATIONS ....................................................... 1
INTRODUCTION............................................................................ 2
HEATER PACKAGES .................................................................... 2
DIMENSIONS ................................................................................. 3
INSTALLATION REQUIREMENTS............................................. 4
INSTALLATION............................................................................. 5
Step 1 - Check Equipment................................................................ 5
Step 2 - Mount Unit.......................................................................... 5
Step 3 - Mount Electric Heater (Optional) ....................................... 8
Step 4 - Installing Ductwork ............................................................ 11
Step 5 - Condensate Drains .............................................................. 12
Step 6 - Refrigerant Piping............................................................... 13
Step 7 - Evacuate Coil and Tubing System...................................... 15
Step 8 - Electrical Connections ........................................................ 16
INDOOR UNIT WIRING................................................................ 16
WIRING REQUIREMENTS ........................................................... 17
ELECTRICAL DATA ..................................................................... 18
CONNECTION DIAGRAMS ......................................................... 18
Step 9 - Third Party Thermostat Installation.................................... 19
Step 10 - Setting Static Pressure and Airflow.................................. 20
Independent Auxiliary Heat Operation ............................................ 21
TEST RUN....................................................................................... 26
SYSTEM CHECKS ......................................................................... 26
START-UP PROCEDURES............................................................ 26
TROUBLESHOOTING................................................................... 27
Installation Instructions
PAGE
Specifications subject to change without notice.
Air Handler Unit Ductless System

SAFETY CONSIDERATIONS

Improper installation, adjustment, alteration, service, maintenance, or
use can cause explosion, fire, electrical shock, or other conditions
which may cause death, personal injury or property damage. Consult a
qualified installer, service agency, or your distributor or branch for
information or assistance. The qualified installer or agency must use
factory-authorized kits or accessories when modifying this product.
Refer to the individual instructions packaged with kits or accessories
when installing.
Follow all safety codes. Wear safety glasses, protective clothing and
work gloves. Have a fire extinguisher available. Read these
instructions thoroughly and follow all warnings or cautions included
in the literature and attached to the unit. Consult local building codes
and the current editions of the National Electrical Code (NEC) NFPA
70.
In Canada, refer to the current editions of the Canadian
Electrical Code CSA C22.1. Recognize safety information.
This is the safety-alert symbol
unit and in instruction manuals, be alert to the potential for personal
injury. Understand the signal words DANGER, WARNING, and
CAUTION. These words are used with the safety-alert symbol.
DANGER identifies the most serious hazards which will result in
severe personal injury or death. WARNING signifies hazards which
could result in personal injury or death. CAUTION is used to identify
unsafe practices which may result in minor personal injury or product
and property damage. NOTE is used to highlight suggestions which
will result in enhanced installation, reliability, or operation.
WARNING
ELECTRICAL OPERATION HAZARD
Failure to follow this warning could result in personal injury or
death.
Before installing or servicing the unit, always turn off all power to
the unit. There may be more than one disconnect switch. Turn off
accessory heater power if applicable. Lock out and tag switch with
a suitable warning label.
CAUTION
CUT HAZARD
Failure to follow this caution may result in personal injury. Sheet
metal parts may have sharp edges or burrs. Use care and wear
appropriate protective clothing and gloves when handling parts.
Sizes 24 to 48
. When you see this symbol on the

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  • Page 1: Table Of Contents

    40MBAA Air Handler Unit Ductless System Sizes 24 to 48 Installation Instructions SAFETY CONSIDERATIONS Improper installation, adjustment, alteration, service, maintenance, or use can cause explosion, fire, electrical shock, or other conditions which may cause death, personal injury or property damage. Consult a qualified installer, service agency, or your distributor or branch for information or assistance.

  • Page 2: Introduction

    This unit is NOT equipped with a single point electrical Fig. 3 — Indoor Unit Representation connection for an Auxiliary Heat Package. A separate power supply is required for the Auxiliary Heat Package. Specifications subject to change without notice. IM-40MBAA-03...

  • Page 3: Dimensions

    1.2 [30] 2.2 [55] C WIDTH 19.7 [501] Bottom View Nominal Filter Size 20 x 16 x 1 inches (515 x 442 x 25 mm) 0.6 [16] 18.4 [466] Fig. 4 — Dimensions IM-40MBAA-03 Specifications subject to change without notice.

  • Page 4: Installation Requirements

    NOTE: DO NOT install the indoor or outdoor units in a location with special environmental conditions. For those applications, contact your Ductless representative. Specifications subject to change without notice. IM-40MBAA-03...

  • Page 5: Installation

    21in 19.6in 18.2in 10.3in 24-48 (1,224mm) (533mm) (498mm) (461mm) (261mm) rooms. Allow a minimum of 24in (60.9 cm) clearance from access panels. 24in(60.9cm) Horizontal Installations Vertical Upflow Installations Fig. 6 — Installation Clearances IM-40MBAA-03 Specifications subject to change without notice.
  • Page 6 Fig. 10 — Open the evaporator cover and remove the Secondary drain plug Condensate Horizontal Right Installations Fig. 8 — Horizontal Right Installations NOTE: For a horizontal right installation, secondary condensate pan (field supplied) must be installed (refer to local codes). Specifications subject to change without notice. IM-40MBAA-03...
  • Page 7 Fig. 15 — Reinstall the Pipe Temperature Sensor 10. Reinstall the drain pan support bracket and locking clip. Fig. 13 — Rotate the evaporator 7. Rotate the evaporator 180°. Fig. 16 — Reinstall the Drain Pan Fixed Plate IM-40MBAA-03 Specifications subject to change without notice.

  • Page 8: Step 3 - Mount Electric Heater (Optional)

    Condensate Pan (check local codes) Horizontal Left Installations Fig. 20 — Horizontal Left Installations NOTE: For a horizontal left installation, a secondary condensate pan (field supplied) must be installed (refer to local codes). Specifications subject to change without notice. IM-40MBAA-03...
  • Page 9 4. Insert the heating module into the opening made by removal of the Fig. 27 — Remove the electronic control box sheet metal cover(s). Ensure the two support rod ends are on the opposite bulkhead. Fig. 24 — Insert Heating Module IM-40MBAA-03 Specifications subject to change without notice.
  • Page 10 (see Figure 30). Each circuit breaker group needs to connect to the power input line. Where needed, Jumper L1 and L2 to the terminals for the other contactor. Fig. 33 — Remove the resilient cap Specifications subject to change without notice. IM-40MBAA-03...

  • Page 11: Step 4 - Installing Ductwork

    The electric auxiliary heat wiring diagram is supplied with the OF 1ft (25.4mm) ALL SIDES accessories. Please paste the wiring diagram in the designated position after installing the heat modules. RECOMMENDED FLEXIBLE DUCT COLLAR Fig. 36 — Flexible Duct Collar Connection IM-40MBAA-03 Specifications subject to change without notice.

  • Page 12: Step 5 - Condensate Drains

    If you discharge the water directly into a sewer, make sure that the drain has a U or S pipe to catch odors that might otherwise come back into the house. Follow the local plumbing codes. Specifications subject to change without notice. IM-40MBAA-03...

  • Page 13: Step 6 - Refrigerant Piping

    Flare nut Copper pipe Fig. 42 — Copper pipe and flare nut d. Remove the PVC tape from ends of pipe when ready to perform the flaring work. IM-40MBAA-03 Specifications subject to change without notice.
  • Page 14 RECOMMENDED SEATING BRASS FLARE SIZE TORQUE FOR BRASS FLARE NUTS Ø3/8 15-18 Ft. - Lbs 20.3 to 24.4 Ø1/2 28-32 Ft. - Lbs 38.0 to 43.4 Ø5/8 38-42 Ft. - Lbs 51.5 to 56.9 Specifications subject to change without notice. IM-40MBAA-03...

  • Page 15: Step 7 - Evacuate Coil And Tubing System

    Ensure tubes are not rubbing against each other or any sheet metal. Pay close attention to the feeder tubes, making sure wire ties on feeder tubes are secure and tight. IM-40MBAA-03 Specifications subject to change without notice.

  • Page 16: Step 8 - Electrical Connections

    Refer to the serial number and wiring diagram located on the indoor unit the cover of the electric control box. Electrical circuit breaker!) heater unit Fig. 54 — Wiring Connection of Electric Heater (optional) Specifications subject to change without notice. IM-40MBAA-03...

  • Page 17: Wiring Requirements

    600 volt rating and double insulated copper wire, must be used as the communication wire from the outdoor unit to the indoor unit. Please use a separate shielded 16AWG stranded control wire. IM-40MBAA-03 Specifications subject to change without notice.

  • Page 18: Electrical Data

    L1(1) L2(2) S(3) Fig. 57 — Control and Power Terminal on Indoor Unit (size 24K) CN 8 on 24V Interface Fig. 58 — Control and Power Terminals on Indoor Unit (sizes 36K to 48K) Specifications subject to change without notice. IM-40MBAA-03...

  • Page 19: Step 9 - Third Party Thermostat Installation

    INDOOR UNIT THERMOSTAT Interface INDOOR UNIT OUTPUT WITH 24VAC 1.5A Main Board Board Fig. 61 — Cooling Only System Wiring Diagram 24V Transformer Fig. 60 — Indoor Unit Control Box Sizes 36 - 48 IM-40MBAA-03 Specifications subject to change without notice.

  • Page 20: Step 10 - Setting Static Pressure And Airflow

    AUTOMATIC AIRFLOW ADJUSTMENT is complete. h. Remove the remote controller battery, and then re-insert the battery after the remote controller screen goes blank. The remote controller exits the SERVICE FUNCTION mode. Specifications subject to change without notice. IM-40MBAA-03...

  • Page 21: Independent Auxiliary Heat Operation

    Figure 65 shows the wiring diagram for when independent operation of the auxiliary heat is needed. During normal operation, the auxiliary relay automatically switches the system between cooling and heating through use of the O signal. Fig. 65 — Auxiliary Relay - Heating Mode IM-40MBAA-03 Specifications subject to change without notice.
  • Page 22 If you are sensitive to light when you go to sleep, you can press the LED button to turn off the LED display on the indoor unit. Press the button again to turn it back on Fig. 66 — RG57 Remote Controller Specifications subject to change without notice. IM-40MBAA-03...

  • Page 23: Fan Performances At Varying Static Pressures

    Return static pressure must be less than 0.40 in wc. Horizontal applications of 48 size must have supply static greater than 0.20 in wc. 3. Airflow above 400 cfm/ton could result in condensate blowing off coil or splashing out of drain pan. IM-40MBAA-03 Specifications subject to change without notice.
  • Page 24 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 Sta c Pressure in. WC. Sta c Pressure in. WC. Fig. 68 — Fan Performance - 36K Specifications subject to change without notice. IM-40MBAA-03...
  • Page 25 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 Sta c Pressure in. WC. Sta c Pressure in. WC. Fig. 69 — Fan Performance - 48K IM-40MBAA-03 Specifications subject to change without notice.

  • Page 26: Test Run

    Ensure there are no leaks in any of the piping. Stop the air conditioner. Turn off the main power switch and reinstall the test cover. Specifications subject to change without notice. IM-40MBAA-03...

  • Page 27: Troubleshooting

    • Filter reminder • Indoor Fan Motor Speed Control after set temperature is reached • Lowest or Highest Temperature Setting • Static Pressure Setting All changes should be performed ONLY by authorized professionals. IM-40MBAA-03 Specifications subject to change without notice.
  • Page 28 Copyright 2021 CAC/BDP D 3300 Riverwood Parkway Atlanta GA, 30339 Edition Date: 02/21 Catalog No. IM-40MBAA-03 Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Replaces: IM-40MBAA-02...

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