Lennox MHB018S4S-1P Installation, Instruction And Service Manual
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Lennox MHB018S4S-1P Installation, Instruction And Service Manual

Lennox MHB018S4S-1P Installation, Instruction And Service Manual

Single-zone mini-split system 115v and 208/230v
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2022 Lennox Industries Inc.
©
Dallas, Texas, USA
General ..........................................................................1
Included Parts ...............................................................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 ...................................................................5
Multiple Outdoor Units .................................................6
Indoor Unit Installation ................................................6
Unit Placement Considerations ...................................6
Installation of Wall Mounting Plate...............................7
Installation of Wall Sleeve............................................7
Outdoor Unit Installation .............................................8
Installing Drain Connector and Seal ............................8
Placement Considerations ...........................................9
Buried Refrigerant Pipe Protection ............................10
Securing the Outdoor Unit .........................................10
Refrigerant Piping Connections ................................11
Leak Test and Evacuation ..........................................13
Leak Test ...................................................................13
Triple Evacuation Procedure......................................13
Wiring Connections ....................................................13
Outdoor Unit .............................................................13
Indoor Unit .................................................................13
Unit Start-Up ...............................................................15
Service Information ....................................................16
Test Run ....................................................................16
Double-Check Line Set Connections .........................16
Indoor Unit Wiring Diagrams .....................................18
Outdoor Unit Wiring Diagrams ...................................19
INSTALLATION INSTRUCTION &
SERVICE INFORMATION
MHB and MWHB Series Units
SINGLE-ZONE MINI-SPLIT SYSTEM
(115V and 208/230V)
508243­01 1/2022
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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Summary of Contents for Lennox MHB018S4S-1P

  • Page 1: Table Of Contents

    Outdoor Unit .............13 Construction Indoor Unit ..............13 Unit Start-Up ...............15 Lennox does not recommend the use of its mini­split Service Information ............16 systems during any phase of construction. Very low return Indoor Unit Alert Codes and Outdoor Unit LED ..16 air temperatures, harmful vapors and operation of the unit Test Run ..............16...

  • Page 2: Included Parts

    Included Parts The assembled indoor unit will include the following items: Table 1. Included Parts Parts Figure Quantity Parts Figure Quantity Installation instruction, Wireless controller 1 ea. user guide and warranty Wireless control Mounting plate holder with 2 mounting (shipped attached to the screws back of the indoor unit) Mounting plate securing...

  • Page 3: Model Number Identification

    Model Number Identification OUTDOOR SINGLE ZONE HEAT PUMP UNITS M H B 009 S 4 S ­ 1 P Series Type Voltage M = Mini-Split L = 115V-1 phase-60Hz P = 208/230V-1 phase-60Hz Minor Design Sequence Unit Type 1 = 1st Revision H = Heat Pump Refrigerant Circuits S = Single Circuit...

  • Page 4: Typical System Components

    Typical System Components 1 (25) DRAIN HOLE (bottom of unit) 12-1/2 12-1/8 (318) (308) 13-5/8 (346) 1-1/4 (32) TOP VIEW 32-1/8 (816) 21-7/8 (556) 2-3/8 (60) 3-3/4 (95) 20-1/8 (511) 31-3/4 (806) 13 (330) 2-3/4 (70) FRONT VIEW SIDE VIEW Figure 3.

  • Page 5: Indoor Units

    Indoor Units System Clearances Outdoor Unit 24 (610) Air Inlet (305) SIDE VIEW FRONT VIEW (305) (610) (2007) Air Outlet Minimum rear clearance can be 6 inches (152 mm) when mounted on brackets and with no obstructions on the other three sides. BOTTOM VIEW Figure 8.

  • Page 6: Multiple Outdoor Units

    Do not install the unit in the following locations: the valve stem recess. • Areas exposed to petrochemicals or petrochemical See the Lennox Service and Application Notes C­08­1 products. for further details and information. • Areas exposed to salt or other corrosive materials or caustic gases.

  • Page 7: Determining Wall Mounting Plate Location

    • Areas exposed to fossil fuels (such as oil or gas in NOTE: It is important to use all screws provided to secure kitchens). the wall mounting plate to the wall. Additional holes may be drilled through the metal wall mounting •...

  • Page 8: Installation Of Indoor Unit On Wall Mounting Plate

    Installation of Indoor Unit on Wall Mounting Plate pump has been installed, it must be checked to ensure proper operation. This check is part of the 1. A length of field-provided flexible condensate piping start­up process which must be done by the installing should be connected to the drain prior to securing the contractor.

  • Page 9: Placement Considerations

    Placement Considerations Protective canopy Consider the following when positioning the unit: Protective canopy • In coastal areas or other places with salty atmosphere of sulfate gas, corrosion may shorten the life of the unit. In coastal areas, the coil should be cleaned with 24 in potable water several times per year to avoid corro­...

  • Page 10: Buried Refrigerant Pipe Protection

    • In heavy snow areas, do not place the unit where drift­ Securing the Outdoor Unit ing will occur as illustrated in “Figure 22. Outdoor Unit Slab or Roof Mounting Air Flow Obstructed by Snow”. Install the unit a minimum of 4 inches (102 mm) above •...

  • Page 11: Refrigerant Piping Connections

    8. After flaring the pipe, temporarily sealed pipe ends with adhesive tape to avoid contaminants from entering the pipes. 6 in 9. The seal on the unit refrigerant piping connections 152 mm should remain in place until the last possible moment. Air Inlet This will prevent dust or water from getting into the refrigerant piping before it is connected.
  • Page 12 Table 5. Flare Nut Torque Recommendations TORQUE WRENCH No torque wrench available Outside BACKUP Recommended Diameter Finger tighten and use an TO INDOOR WRENCH Torque appropriately sized wrench to UNIT Inches turn an additional: 41 ft.-lb. (56 N) 7/8 turn 48 ft.-lb.

  • Page 13: Leak Test And Evacuation

    5. Evacuate the system to a minimum reading of 500 Leak Test and Evacuation Microns (0.5 Torr). 6. For a moisture­free system, ensure the vacuum is Air and moisture remaining in the refrigerant system will held without movement for a minimum of 4 hours. have undesirable effects as indicated below: •...
  • Page 14 Terminal block Terminal Block Cover Screw Cable Clam p The wiring diagram is located on the inside of the indoor unit’s terminal block cover. Figure 31. Indoor Unit Terminal Block 115VAC Indoor Unit 208/230V Indoor Unit Terminal Block 115VAC Outdoor Unit Terminal Block 208/230V Outdoor Unit Terminal Block...

  • Page 15: Unit Start-Up

    Unit Start-Up IMPORTANT Units should be energized 24 hours before unit start-up to prevent compressor damage as a result of slugging. 1. Inspect all factory- and field-installed wiring for loose connections. 2. Verify that the manifold gauge set is connected. 3.

  • Page 16: Service Information

    Test Run Service Information Pre-Checks Only perform test run after you have completed the Indoor Unit Alert Codes and Outdoor Unit LED following steps: The following codes are display on the indoor unit LED on • Electrical Safety Checks – Confirm that the unit’s the outdoor unit.

  • Page 17: Ambient Temperature Is Below 60ºf (16ºc)

    Ambient Temperature is Below 60ºF (16ºC) After installation, confirm that all electrical wiring is installed in accordance with local and national regulations, and according to the installation instruction. You cannot use the wireless remote control to turn on the COOL function when the ambient temperature is below 60°F (16°C).

  • Page 18: Indoor Unit Wiring Diagrams

    Indoor Unit Wiring Diagrams Figure 34. MWHB 09K,12K, and 18K - 115V and 208/230VAC Indoor Unit Wiring Diagram 16022000C27182 Figure 35. MWHB 24K 208/230VAC Indoor Unit Wiring Diagram...

  • Page 19: Outdoor Unit Wiring Diagrams

    Outdoor Unit Wiring Diagrams Figure 36. MHB 9K and 12K - 115VAC Outdoor Unit Wiring Diagram Figure 37. 09K, 12K and 18K - 208/230VAC Outdoor Unit Wiring Diagram...
  • Page 20 Figure 38. MHB 24K - 208/230VAC Outdoor Unit Wiring Diagram...

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