Product overview
Mitsubishi GX-Series 3-Zone Wall-Mount Mini Split Heat Pump - 9K + 9K + 12K
Comfort for three separate rooms from one Mitsubishi multi-zone outdoor system. This GX-Series package pairs the MXZ-SM36NLHZ outdoor heat pump with 9K + 9K + 12K wall-mounted indoor units for efficient heating and cooling without adding ductwork.
The outdoor system is in Mitsubishi's 36,000 BTU class. For non-ducted indoor combinations like this wall-mount setup, the catalog lists 36,000 BTU cooling, 42,000 BTU heating, 23 SEER2 efficiency, and AHRI certificate 215685464.
Hyper Heat performance helps maintain stronger heating output in cold weather, making this a strong option for homes where winter performance matters.
This Smart Multi configuration includes the PAC-LMA30BC branch box in the package. The branch box is part of the required system architecture for these 36K Smart Multi combinations.
At a Glance:
| Best For | larger three-zone homes where high efficiency and strong cold-weather heating output both matter |
| System Models | MXZ-SM36NLHZ / PAC-LMA30BC / 2-MSZ-GX09NL / MSZ-GX12NL |
| Indoor Combination | 9K + 9K + 12K |
| AHRI Non-Ducted Capacity | 36,000 BTU cooling / 42,000 BTU heating |
| Heating Capacity at 5F | 42,000 BTU |
| Efficiency | 23 SEER2 / 14.5 EER2 / 12.0 HSPF2 |
| Voltage | 208/230V, 1 phase |
| Refrigerant | R-454B |
| Controls | Handheld remote included / WiFi built in on GX wall-mounted indoor units |
| Installation Type | Professional HVAC installation required |
Why Choose This Mitsubishi 3-Zone System?
- Three-room comfort: Heat and cool three spaces independently using one Mitsubishi outdoor system.
- GX wall-mounted indoor units: GX indoor units include handheld remote control capability and built-in WiFi per the catalog.
- Efficient inverter performance: Mitsubishi inverter technology varies output to help maintain steadier comfort than basic on/off equipment.
- Current-generation refrigerant: Built around Mitsubishi's R-454B equipment lineup.
- Clean installation profile: Wall-mounted indoor units avoid ductwork and are well suited for bedrooms, offices, additions, bonus rooms, and other defined spaces.
What Is Included?
- 1 Mitsubishi MXZ-SM36NLHZ outdoor multi-zone heat pump condenser
- 1 Mitsubishi PAC-LMA30BC Smart Multi branch box
- 2 Mitsubishi MSZ-GX09NL 9K wall-mounted indoor units
- 1 Mitsubishi MSZ-GX12NL 12K wall-mounted indoor unit
- Handheld remote control capability for each indoor unit
Line-set note: choose a line-set length for each indoor unit. Select None for any zone where you do not want a line set included. Mixed-length line sets are supported; electrical accessories, pads, brackets, disconnects, condensate pumps, and other installation materials may need to be quoted or purchased separately.
Before You Order:
- Have your installer confirm room loads, indoor placement, outdoor placement, line-set routing, electrical requirements, and local code requirements.
- Nominal indoor sizes like 9K + 9K + 12K are not a substitute for a Manual J load calculation.
- This is not a DIY quick-connect system. Refrigerant piping, evacuation, electrical work, startup, and commissioning should be handled by a qualified HVAC professional.
- Confirm branch-box location and branch-box-to-indoor routing before purchase.
Frequently Asked Questions:
Why does the title say 36,000 BTU if the indoor combination is 9K + 9K + 12K?
The outdoor unit is Mitsubishi's 36,000 BTU class condenser. The catalog's non-ducted AHRI configuration for this outdoor system lists 36,000 BTU cooling and 42,000 BTU heating.
Can each room have its own temperature setting?
Yes. Each wall-mounted indoor unit can be controlled separately, subject to normal multi-zone operating limits.
Are line sets included?
Only for zones where you select a line-set length. Each indoor unit has its own line-set selector.
Is this a DIY system?
No. Mitsubishi multi-zone equipment should be installed and commissioned by a qualified HVAC professional.
Specifications:
| BRAND NAME | Mitsubishi |
| SERIES | GX-Series |
| SYSTEM TYPE | 3-zone ductless mini split heat pump |
| OUTDOOR MODEL | MXZ-SM36NLHZ |
| INDOOR MODELS | 2-MSZ-GX09NL / MSZ-GX12NL |
| BRANCH BOX | PAC-LMA30BC included |
| ZONE CAPACITY | 3 zones |
| AHRI CERTIFICATE NUMBER | 215685464 |
| AHRI TYPE | Non-ducted indoor units |
| COOLING CAPACITY | 36,000 BTU |
| HEATING CAPACITY | 42,000 BTU |
| HEATING CAPACITY AT 5F | 42,000 BTU |
| SEER2 | 23 |
| EER2 | 14.5 |
| HSPF2 | 12.0 |
| REFRIGERANT TYPE | R-454B |
| POWER SUPPLY | 208/230V, 1 phase |
| OUTDOOR UNIT TYPE | Smart Multi Hyper Heat branch-box condenser |
| REGISTERED WARRANTY | 10-year parts and compressor limited warranty when registered within 90 days; terms apply |
| NON-REGISTERED WARRANTY | 5-year parts / 7-year compressor limited warranty; terms apply |
Indoor Unit Details:
| Indoor Model | Nominal Size | Rated Indoor Capacity | Line Size | Dimensions |
| 2 x MSZ-GX09NL | 9K | 9,000 BTU cooling / 10,900 BTU heating | 1/4 in liquid / 3/8 in gas | 11-25/32 in H x 31-13/32 in W x 9-21/32 in D |
| MSZ-GX12NL | 12K | 12,000 BTU cooling / 14,400 BTU heating | 1/4 in liquid / 3/8 in gas | 11-25/32 in H x 31-13/32 in W x 9-21/32 in D |
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