How to Pick the Perfect Mini Split Floor Mounted Indoor Unit
If you are installing a mini split system but you don't have enough clearance f...
Local Pickup FAQ's
Hover to zoom
1 Of 5
Mitsubishi Ceiling Cassette 3-Zone System - 42,000 BTU Outdoor - 12k + 12k + 12k Indoor - 19.7 SEER2
Model:
M3H42C12121200
+
Share This Product
Recommended Accessories
Expert Recommended Accessories
Selected by Ken, our Expert
Required Accessories
9
These accessories are required to properly setup/install this product.
Optional Accessories
10
Features
- Precision Temperature Control Technology
- The MXZ-5C42NA4 outdoor condenser is equipped with inverter technology and an electronic linear expansion valve. These components improve temperature accuracy and system efficiency through precise adjustments of both compressor speed and refrigerant flow.
- Hot-Start
- Mitsubishi's hot-start technology prevents cold drafts by delaying fan operation until the heat exchanger has warmed up.
- Dehumidification
- When the indoor unit is run in dry mode, it will remove extra moisture from the room. This improves your comfort and reduces both mold growth and the chance of property damage in the conditioned space.
- 3D i-see Sensor™
- The SLZ-KF cassette unit includes an advanced thermal sensor that scans the room for hot and cold spots as well as occupancy. Using this information, the cassette unit can be programmed to direct airflow to certain areas of the zone in specific scenarios.
- Condensate Removal System
- The included SLZ-KF indoor units contain an internal drain mechanism capable of lifting condensate 33". This simplifies installation and prevents condensate overflow, which can damage or destroy your property.
- Advanced Remote Controller
- The MHK1 wireless controllers have dual set point control, allowing you to set how fast your zones are cooled or heated. They offer scheduling options, providing you with exceptional flexibility. With these features, your home will always be comfortable.
- Inconspicuous Design
- If you are looking for unobtrusive zoned comfort, this system is right for you. The only visible portion of the indoor units are the grilles, which clock in at a slender depth of 13/16".
- Recommended line set sizes for indoor unit connectivity:
- SLZ-KF12NA.TH-NG: 1/4" x 3/8" Line Set (Qty 3)
- (1) Mitsubishi - 42k BTU - M-Series Outdoor Condenser - For 2-5 Zones (MXZ-5C42NA4)
- (3) Mitsubishi - 12k BTU - M-Series Ceiling Cassette - For Multi or Single-Zone - Grille Sold Separately (SLZ-KF12NA.TH-NG)
- (3) Mitsubishi RedLINK - Wireless Remote Controller Kit - Programmable - Wall Mounted (MHK2)
- (3) Mitsubishi SLP-18FAU Ceiling Cassette Grille For Mitsubishi SLZ-KF-NA Mini Split Units - With 3D i-see Sensor (SLP-18FAEU)
- Line Set - This double insulated tubing transfers refrigerant efficiently between your outdoor condenser and indoor units.
- Drain Tubing - Drain tubing facilitates the reliable and effective removal of condensate from your system. It connects your indoor units to drain locations of your choosing. We recommend locally purchased PVC hard pipe for the condensate drain on cassette and concealed duct units.
- Disconnect Box & Electrical Whip Kit - The Disconnect Box & Whip Kit provides a safe and simple way to connect your outdoor condenser to your fuse box.
- Connecting Wire - This durable, insulated wire provides power to your indoor units from your outdoor condenser.
- Base Pan Heater - The base pan heater prevents ice from building up on the outdoor unit. Excessive ice build will lead to performance issues and could damage your unit.
- Outdoor Condenser Plastic Pad or Wall Bracket - We recommend outdoor condensers should not be placed directly on the ground. An outdoor condenser pad or wall bracket will provide a stable way to mount your condenser free from obstructions and debris.
For over 50 years, Mitsubishi has remained at the forefront of the mini split industry thanks to their dedication to providing efficient, user-friendly comfort solutions. This is a three zone mini split system designed to give you individual control over the temperature in multiple rooms. An efficient MXZ-5C42NA4 outdoor condenser, built with advanced technology, is combined with low-profile SLZ-KF ceiling cassette indoor units and three wireless remote controllers for the perfect marriage of convenience and comfort. With multiple operating modes, multiple fan speeds, and multiple airflow directions, this is a system that fits the needs of nearly any home.
Product Includes
Product Note
Each indoor unit will include any port adapters necessary for multi-zone installation. This product requires the following accessories for installation:
Specifications
Product Includes
- (1) Mitsubishi - 42k BTU - M-Series Outdoor Condenser - For 2-5 Zones (MXZ-5C42NA4)
- (3) Mitsubishi - 12k BTU - M-Series Ceiling Cassette - For Multi or Single-Zone - Grille Sold Separately (SLZ-KF12NA.TH-NG)
- (3) Mitsubishi RedLINK - Wireless Remote Controller Kit - Programmable - Wall Mounted (MHK2)
- (3) Mitsubishi SLP-18FAU Ceiling Cassette Grille For Mitsubishi SLZ-KF-NA Mini Split Units - With 3D i-see Sensor (SLP-18FAEU)
M3H42C12121200
Overview
Product Category
Mini Split Heat Pump System
General Information
Type
Ceiling Cassette
Product Line
M-Series
Product Category
Mini Split Heat Pump System
Operating Mode
Operating Mode
Some products are only capable of cooling, while others can either heat or cool a space. Some products heat via "heat pump" technology while others use electric heating elements. Learn More
Heating and Cooling
Number of Zones
Number of Zones
A zone is a room or area within a building that has its own temperature control.
3
Refrigerant Type
R-410A
Indoor Unit Size(s)
Indoor Unit Size(s)
Mini split systems can have one or more indoor units connected to a single outdoor unit. Indoor Unit Size(s) specifies what indoor unit sizes are used in a system. We have combined 6k and 7k indoor units to enhance searchability.
12 + 12 + 12
System Code
1212120000
Outdoor Unit Size
42000 BTU
DOE Regional Compliance
DOE Regional Compliance
In 2015, the US Department of Energy broke the country into three regions - North, Southeast, and Southwest - and set legal standards for energy efficiency within each region. Learn More
Nationwide
Performance
Low Ambient Heating
No
Minimum Outdoor Temperature for Heating
Minimum Outdoor Temperature for Heating
This is the lowest rated outdoor temperature for heating operation. Because heat pumps rely on heat available in outdoor air, the amount of heat they are able to supply decreases with outdoor temperatures. Learn More
5 F
Minimum Outdoor Temperature for Cooling
14 F
SEER2
SEER2
The U.S Department of Energy has raised the minimum rating requirements starting in 2023 that include updated testing conditions and metrics to better reflect real-world conditions. SEER2 (Seasonal Energy Efficiency Ratio) is a measurement of cooling efficiency over a typical cooling season. It is useful for comparing energy efficiency of cooling systems. The higher the SEER2, the more energy efficient the system.
19.7
EER2
EER2
The U.S Department of Energy has raised the minimum rating requirements starting in 2023 that include updated testing conditions and metrics to better reflect real-world conditions. EER2 (Energy Efficiency Ratio) is a measurement of cooling efficiency under fixed conditions. It is useful for comparing units that will operate consistently under one set of conditions (e.g. server room). The higher the EER2, the more efficient the system.
9.2
HSPF2
HSPF2
The U.S Department of Energy has raised the minimum rating requirements starting in 2023 that include updated testing conditions and metrics to better reflect real-world conditions. HSPF2 (Heating Seasonal Performance Factor) is a measure of heating efficiency for heat pumps. It is useful for comparing energy efficiency of heat pumps. The higher the HSPF2, the more efficient the system.
9.2
Dimensions
Product Weight
282 Pounds
Shipping Weight
286 Pounds
Certifications
ETL Listed
Yes
AHRI Certified
Yes
AHRI Reference Number
212925465
MXZ-5C42NA4
General Information
Type
Outdoor Condenser
Product Line
M-Series
Product Category
Mini Split System Components
Operating Mode
Operating Mode
Some products are only capable of cooling, while others can either heat or cool a space. Some products heat via "heat pump" technology while others use electric heating elements. Learn More
Heating and Cooling
Maximum Number of Zones
5
Multi-Zone Compatible
Yes
Refrigerant Type
R-410A
Installation Location
Outdoor
Base Pan Heater Included
No
Performance
Cooling BTU
42000
Cooling Capacity
43000 BTU
Heating Capacity
53600 BTU
Maximum Sound Level
Maximum Sound Level
Sound levels are measured in decibels (dB). The lower the decibel rating, the less noise the product makes. As an example, a ticking watch is 20 dB while on the other end of the scale, a lawn mower is around 90 dB. Learn More
58 dB
Low Ambient Heating
No
Minimum Outdoor Temperature for Heating
Minimum Outdoor Temperature for Heating
This is the lowest rated outdoor temperature for heating operation. Because heat pumps rely on heat available in outdoor air, the amount of heat they are able to supply decreases with outdoor temperatures. Learn More
5 F
Minimum Outdoor Temperature for Cooling
14 F
Electrical Data
Voltage
208/230 Volts
Phase
1
Frequency
60 Hz
Minimum Circuit Ampacity
32.5 Amps
Recommended Breaker Size
40 Amps
Dimensions
Maximum Line Length
262 Feet
Line Set A Liquid Connection
1/4 Inch
Line Set A Gas Connection
1/2 Inch
Line Set B Liquid Connection
1/4 Inch
Line Set B Gas Connection
3/8 Inch
Line Set C Liquid Connection
1/4 Inch
Line Set C Gas Connection
3/8 Inch
Line Set D Liquid Connection
1/4 Inch
Line Set D Gas Connection
3/8 Inch
Line Set E Liquid Connection
1/4 Inch
Line Set E Gas Connection
3/8 Inch
Product Height
41 13/48 Inches
Product Width
37 19/48 Inches
Product Depth
13 Inches
Product Weight
189 Pounds
Shipping Height
48 7/16 Inches
Shipping Width
41 3/8 Inches
Shipping Depth
17 3/8 Inches
Shipping Weight
218 Pounds
Certifications
ETL Listed
Yes
Warranty Information
Parts Warranty
Parts Warranty
A warranty is a safeguard from defects in manufacturing and can vary in length and terms. Some manufacturers require registration for extended warranty benefits, be sure to check out features and the warranty document. To see the manufacturer's warranty statement, click on the Manuals tab. Learn More
5 Years
Compressor Warranty
7 Years
SLZ-KF12NA-NG
General Information
Type
Ceiling Cassette
Product Line
M-Series
Operating Mode
Operating Mode
Some products are only capable of cooling, while others can either heat or cool a space. Some products heat via "heat pump" technology while others use electric heating elements. Learn More
Heating and Cooling
Multi-Zone Compatible
Yes
Indoor Unit Size(s)
Indoor Unit Size(s)
Mini split systems can have one or more indoor units connected to a single outdoor unit. Indoor Unit Size(s) specifies what indoor unit sizes are used in a system. We have combined 6k and 7k indoor units to enhance searchability.
12
Installation Location
Indoor
Grille
Not Included
Required Grille Model
SLP-18FAEU
Performance
Cooling BTU
12000
Cooling Capacity
12000 BTU
Maximum Air Flow
335 CFM
Minimum Air Flow
207 CFM
Minimum Sound Level
34 dB
Maximum Sound Level
Maximum Sound Level
Sound levels are measured in decibels (dB). The lower the decibel rating, the less noise the product makes. As an example, a ticking watch is 20 dB while on the other end of the scale, a lawn mower is around 90 dB. Learn More
25 dB
Electrical Data
Voltage
208/230 Volts
Phase
1
Frequency
60 Hz
Dimensions
Gas Connection Size
3/8 Inch
Liquid Connection Size
1/4 Inch
Product Height
9 31/48 Inches
Product Width
22 7/16 Inches
Product Depth
22 7/16 Inches
Product Weight
31 Pounds
Shipping Weight
37 Pounds
Certifications
ETL Listed
Yes
AHRI Certified
Yes
Warranty Information
Parts Warranty
Parts Warranty
A warranty is a safeguard from defects in manufacturing and can vary in length and terms. Some manufacturers require registration for extended warranty benefits, be sure to check out features and the warranty document. To see the manufacturer's warranty statement, click on the Manuals tab. Learn More
5 Years
MHK2
General Information
Type
Mini Split Controller
Product Line
RedLINK
Product Category
Mini Split Accessories
Programmable
Yes
Power Source
AA Batteries
Interface
Touchscreen
Performance
Minimum Operating Temperature
32 F
Maximum Operating Temperature
120 F
Dimensions
Product Height
4 1/12 Inches
Product Width
4 1/12 Inches
Product Depth
1 1/16 Inches
Overview
Product Category
Mini Split Accessories
SLP-18FAEU
General Information
Type
Grille
Product Line
M-Series
Dimensions
Product Height
6/15 Inch
Product Width
24 29/48 Inches
Product Depth
24 29/48 Inches
Product Weight
5.3 Pounds
Reviews
(3)
Mitsubishi M3H42C12121200 Reviews & Ratings
Product Q&A
(2)
Product Questions
Answered by Ken, the eComfort Product Expert
Can these systems can be controlled by the Nest learning thermostat?
Jeff
from New York
February 15, 2017
When the room units are hung is it necessary to have holes through to the exterior of the house?
Kevin B.
from New York
August 07, 2016
How-To Articles
What You Should Know About Mini-Split Wiring
Although they are easier to install than central air conditioning systems, mini...
How to Pick the Perfect Mitsubishi Mini-Split Condenser
If you're struggling to keep your home or office comfortable, you are not alone...
eComfort How-To Library
Articles, Tips and Buying Guides from Our Experts
Manuals
MXZ-5C42NA4
SLZ-KF12NA-NG
Ask A Question!
*Required Fields
+
Thank You For Submitting Your Question
Your submission has been sent successfully. Please give our experts up to two business days to respond.
Media Gallery
Mitsubishi Ceiling Cassette 3-Zone System - 42,000 BTU Outdoor - 12k + 12k + 12k Indoor - 19.7 SEER2
Customer Review Images
