Lennox MHA Series Installation Instructions Manual
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Lennox MHA Series Installation Instructions Manual

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2019 Lennox Industries Inc.
©
Dallas, Texas, USA
General ...........................................................................1
Included Parts.................................................................2
Catalog Numbers............................................................2
Model Number Identification ...........................................3
Typical System Components ..........................................4
System Dimensions ........................................................4
Outdoor Units ..............................................................4
Indoor Units .................................................................5
Indoor Unit Wall Mounts ..............................................5
System Clearances ........................................................5
Outdoor Unit ................................................................5
Indoor Unit ...................................................................6
Multiple Outdoor Units .................................................6
Indoor Unit Installation ....................................................7
Unit Placement Considerations ...................................7
Installation of Wall Mounting Plate...............................7
Installation of Wall Sleeve............................................8
Outdoor Unit Installation .................................................9
Placement Considerations ...........................................9
Condensate Piping ....................................................10
Buried Refrigerant Pipe Protection ............................10
Securing the Outdoor Unit .........................................11
Refrigerant Piping Connections ....................................11
Adding Refrigerant for Longer Line Set ........................13
Leak Test and Evacuation ............................................13
Leak Test ...................................................................13
Triple Evacuation Procedure......................................13
Wiring Connections ......................................................14
Outdoor Unit .............................................................14
Indoor Unit .................................................................14
Wiring Diagrams ........................................................16
Unit Start­Up .................................................................18
Troubleshooting ............................................................18
Test Run .......................................................................19
Pre-Checks ................................................................19
Procedure ..................................................................19
Test Run Checklist ........................................................19
Double­Check Line Set Connections............................19
INSTALLATION
INSTRUCTIONS
MHA Series Units
SINGLE-ZONE MINI-SPLIT SYSTEM
(115V and 208/230V)
507927­01 6/2019
Supersedes 3/2019
THIS MANUAL MUST BE LEFT WITH THE OWNER
FOR FUTURE REFERENCE
WARNING
Improper installation, adjustment, alteration, ser vice
or maintenance can cause property damage, personal
injury or loss of life.
Installation and service must be performed by a li­
censed professional HVAC installer (or equivalent) or a
service agency.
CAUTION
In order to avoid injury, take proper precaution when
lifting heavy objects.
General
Refer to the Product Specifications bulletin (EHB) for more
product information. These instructions are intended as
a general guide and do not supersede local or national
codes in any way. Authorities having jurisdiction should
be consulted before installation.
This wall­mounted indoor unit is matched with an outdoor
heat pump unit to create a mini­split system that uses
HFC­410A refrigerant.
Use of Mini-Split System During
Construction
Lennox does not recommend the use of its mini­split
systems during any phase of construction. Very low return
air temperatures, harmful vapors and operation of the unit
with clogged or misplaced filters will damage the system.
However, mini­split systems may be used for cooling of
buildings under construction, if the following conditions
are met:
•
Air filter must be installed in the system and must be
maintained during construction.
•
Air filter must be replaced upon construction comple­
tion.
•
The indoor wall unit assembly must be thoroughly
cleaned following final construction clean-up.
•
All mini-split operating conditions must be verified ac­
cording to these installation instructions.

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  • Page 1: Table Of Contents

    Direct Sunlight, Rain and Ice Protection ......9 Construction Condensate Piping ............10 Buried Refrigerant Pipe Protection ......10 Lennox does not recommend the use of its mini­split Securing the Outdoor Unit .........11 systems during any phase of construction. Very low return Refrigerant Piping Connections ........11 air temperatures, harmful vapors and operation of the unit Adding Refrigerant for Longer Line Set ......13...

  • Page 2: Included Parts

    Return Air Filters Plastic screw anchors (Shipped installed in indoor unit.) Catalog Numbers Table 2. Component Catalog Number Cross-Reference Catalog Product Capacity Voltage Lennox Model Number Numbers Wall Mounted (Indoor Unit) 115V MWHA009S4­1L 17K07 Wall Mounted (Indoor Unit) 115V MWHA012S4­1L 17K09 Wall Mounted (Indoor Unit) 208­230V...

  • Page 3: Model Number Identification

    IMPORTANT WARNING All illustrations in this instruction are typical and do The clean Air Act of 1990 bans the intentional venting of not always represent the exact appearance of the refrigerant (CFCs, HCFCs, and HFCs) as of July, 1992. equipment. Approved methods of recovery, recycling or reclaiming must be followed.

  • Page 4: Typical System Components

    Typical System Components MHA012S4S, MHA018S4S 31-1/2 (815) 21-7/8 (556) 13-1/8 (333) 20-1/4 (514) (13) (19) 31-1/2 (800) SIDE VIEW 2-3/4 FRONT VIEW (70) 2-3/8 (60) ON/OFF 14-3/8 TIMER MODE TEMP FAN/SLC TIMER (365) SLEEP SWING DIRECT 13-3/8 TURBO CLEAN FOLLOW 12-1/4 (340) (311)

  • Page 5: Indoor Units

    Indoor Units MHWA018S4 20-3/8 (518) 6-3/4 (171) 5-5/8 5-3/8 (137) (143) 2-1/4 (57) Wall-Mount 2-1/4 Unit Outline TOP VIEW (57) 2-3/8 (60) 38 (965) Left Rear Hole Right Rear Hole 2-1/2 in. (64 mm) 2-1/2 in. (64 mm) diameter diameter Figure 8.

  • Page 6: Indoor Unit

    Indoor Unit Ceiling 6” (152 mm) Minimum Clearance Wall Any Object Wall 5” 5” 59” (127 mm) (127 mm) (1499 mm) Minimum Minimum Minimum SIDE VIEW Vertical Clearance - Clearance to Floor - 72 inches (1829 mm) Minimum 96 inches (2438 mm) Recommended Floor FRONT VIEW Figure 11.

  • Page 7: Torque Requirements For Caps And Fasteners

    See the Lennox Service and Application Notes C­08­1 for further details and information. Determining Wall Mounting Plate Location Table 3. Torque Requirements...

  • Page 8: Installation Of Wall Sleeve

    Installation of Indoor Unit on Wall Mounting Plate wall construction. Use the appropriate type of anchors for the application. 1. A length of field-provided flexible condensate piping 3. The wall mounting plate must be installed flush should be connected to the drain prior to securing the against the wall so that the indoor unit will be flush unit to the wall mounting plate.

  • Page 9: Outdoor Unit Installation

    pump has been installed, it must be checked to • Avoid installing the outdoor unit near a bedroom or other places where noise may cause a problem. ensure proper operation. This check is part of the start­up process which must be done by the installing •...

  • Page 10: Condensate Piping

    24 in 610 mm 12 in 305 mm 12 in 305 mm 79 in 2007 mm Air Inlet 12 in Air Outlet 305 mm 24 in 610 mm NOTE - Minimum clearances shown. Figure 23. Outdoor Unit Air Flow Obstructed by Figure 21.

  • Page 11: Securing The Outdoor Unit

    • The conduit must be designed so it cannot collect and retain water. Securing the Outdoor Unit 6 in 152 mm Slab or Roof Mounting Air Inlet Install the unit a minimum of 4 inches (102 mm) above the roof or ground surface to avoid debris build­up around Air Outlet the unit.
  • Page 12 Table 4. Flaring Pipe Flare Dimension A (mm) CANT ON THE OUTSIDE OF Pipe Diameter Flare Shape THE FLARE 1/4” MALE FLARE 90 ° 4 3/8” 12.0 12.4 CONNECTION 1/2” 15.4 15.8 5/8” 18.6 19.1 R0.4~0.8 3/4” (22.9) 22.9 23.3 Figure 30.

  • Page 13: Adding Refrigerant For Longer Line Set

    Minimum Line Set Length - 10 ft. (3m) Maximum Line Set OUTDOOR UNIT INDOOR UNIT Length Maximum Line Set Length Maximum Maximum Elevation - Elevation - INDOOR UNIT Outdooor Outdooor Unit BELOW Unit ABOVE Indoor Unit Indoor Unit OUTDOOR UNIT Minimum Line Set Length - 10 ft.

  • Page 14: Wiring Connections

    3. Evacuate the system to a reading of 5000 Microns (5 • Be sure to reattach all electrical box covers after con­ nections are complete. Torr). 4. Break the vacuum by allowing nitrogen into the port Indoor Unit connections (liquid and gas line pipes) until a positive •...
  • Page 15 IMPORTANT This unit must be properly grounded and protected by a circuit breaker. The ground wire for the unit must not be connected to a gas or water pipe, a lightning conductor or a telephone ground wire. Do not connect power wires to the outdoor unit until all other wiring and piping connections have been completed. Do not install the unit near a lighting appliance that includes a ballast.

  • Page 16: Wiring Diagrams

    Wiring Diagrams WIRING DIAGRAM (INDOOR UNIT) FOR REMOTE ON/OF NOTE: COMPONENT IN DASH LINE IS OPTIONAL OR FIELD WIRING MODE REMOTE ON/OFF ON REMOTE ON/OFF OFF FACTORY SETTING CN10A DISPL AY BOAR D ADA PTE R B OA RD CN 2(C N201) CN 3(C N301) CN501 CN402...
  • Page 17 YELLOW OR BLACK REAC TOR L N Y/G CN 3 CN 1 CN 2 CN 16 CN 1A OUTDOOR CONTROL BLUE CN 30 4-WAY CN 29 CN 28 BLACK CRANKCASE HEATER HEATER CN 21 CN 7 DC- F AN T3 T4 Figure 37.

  • Page 18: Unit Start-Up

    BLACK 3 BLUE L1L2 CN 6 CN 7 CN 8 CN 2 CN 3 L1 L2 OUTDOOR CONTROL BLUE 4-WAY BLACK CRANKCASE HEATER COMPRESSOR HEATER CN 17 CN 414 DC- FAN Figure 39. 24K - 208/230VAC Outdoor Unit Wiring Diagram Unit Start-Up Troubleshooting IMPORTANT...

  • Page 19: Test Run

    Ambient Temperature is Below 63ºF (17ºC) Table 10. Indoor Unit Error Codes Display Error Information After installation, confirm that all electrical wiring is installed in accordance with local and national regulations, Outdoor ambient temperature too low. and according to the installation instruction. Inverter compressor drive error You cannot use the wireless remote control to turn on the COOL function when the ambient temperature is below...

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