Mini Split Multi 5 Zone Mitsubishi 19.3 SEER2 Heat Pump R-454B Condenser, MXZ5D42NL
The MXZ-5D42NL is the largest condenser in Mitsubishi's R-454B multi-zone range and the one to specify when five rooms add up to real load. Rated 40,500 BTU/h cooling at 95°F and 45,000 BTU/h heating at 47°F, it reaches a maximum cooling output of 43,000 BTU/h and a maximum heating output of 53,600 BTU/h, and accepts up to 51,000 BTU/h of total connected indoor capacity — 10,000 BTU/h more than any other model here. It also has the longest reach at 262 feet of total piping, and holds 30,500 BTU/h maximum heating at 17°F with 25,000 BTU/h at 5°F. Every zone can be an MSZ-GX wall-mount head with its wireless remote controller included, or an SLZ-AF four-way ceiling cassette with SLP-18FAU grille. kumo cloud Wi-Fi ready. Choose your indoor units below.
When Five Zones Add Up to Real Capacity
The 51,000 BTU/h connected-capacity ceiling is what distinguishes this condenser from the MXZ-5D36NL. Where the smaller unit caps at 41,000 and effectively pushes you toward modest indoor units, this one supports genuinely large rooms in the mix — a 24,000 BTU wall-mount head or a pair of 18,000 BTU cassettes alongside smaller bedroom units, without running out of budget. Combined with 262 feet of total piping, it suits larger homes rather than compact ones.
Electrically it is also a step up and worth catching early in design: 39.2 A minimum circuit ampacity, 67 A maximum overcurrent protection, and a 40-amp recommended breaker — considerably more than the 25-amp circuits the other MXZ multis use. Confirm panel capacity before committing. On the load side, calculate each of the five rooms against its own insulation, glazing area and orientation, ceiling height and volume, infiltration, and occupancy, then verify the whole set against the connected-capacity limit and the indoor/outdoor compatibility table. Format follows the room: cassettes where wall space is committed or the ceiling is already dropped, wall-mount heads everywhere else.
Ideal for: Larger four and five bedroom homes, houses combining a big great room with several bedrooms, multi-level layouts needing per-floor control, whole-house retrofits with no usable ductwork, duplex and small multi-family conversions, and commercial suites where flush ceiling cassettes suit the client-facing rooms.
Need more capacity or zones? This is the largest condenser in the Mitsubishi R-454B multi range — bigger projects use a second multi-zone condenser or add dedicated single-zone systems. Browse the full range on our ductless mini split systems page.
Recommended applications are general guidelines only. Actual system requirements depend on insulation, glazing, ceiling height, ambient conditions, occupancy, and internal heat gain in each zone. Always verify indoor unit selection against the connected-capacity limits on the submittal and the compatibility table in the technical specifications. Request free sizing assistance, contact Budget Heating, or call 813-885-7999.
What's Included
| Outdoor Condenser | MXZ-5D42NL — 5 Zone Multi-Zone Inverter Heat Pump Condenser |
|---|---|
| Indoor Unit Options | Selected Separately Below — MSZ-GX 6K through 24K Wall-Mount or SLZ-AF 9K through 18K Ceiling Cassette |
| Zones Supported | 2 to 5 Indoor Units |
| Rated Capacity | 40,500 BTU/h Cooling @ 95°F / 45,000 BTU/h Heating @ 47°F |
| Maximum Capacity | 43,000 BTU/h Maximum Cooling / 53,600 BTU/h Maximum Heating |
| Max Connected Indoor Capacity | 51,000 BTU/h Total — Highest in the MXZ R-454B Range |
| Low-Temperature Heating | 30,500 BTU/h Max @ 17°F / 25,000 BTU/h Max @ 5°F |
| Efficiency | 19.30 SEER2 / 9.30 EER2 / 9.10 HSPF2 (Non-Ducted Rating) |
| Maximum Line Length | 262 ft Total / 82 ft to Furthest Indoor Unit / 49 ft Height Difference |
| Refrigerant | R-454B Low-GWP, 6 lb 3 oz Factory Pre-Charge |
| Electrical | 208/230V, Single Phase, 60 Hz — 39.2 A MCA, 40 A Recommended Breaker |
| Controls | Wireless Remote Controller Standard With MSZ-GX Heads; Controller Selected Separately for SLZ Cassettes; kumo cloud Wi-Fi Ready |
| Warranty | 10 Year Manufacturer Warranty |
AHRI certification 216505932 applies to this condenser. The cabinet measures 37-13/32 in. wide x 13 in. deep x 31-11/32 in. high at 152 lb, with sound pressure of 58 dB(A) cooling and 59 dB(A) heating. Maximum overcurrent protection is 67 A. Cooling operates to a 14°F intake and heating to a 6°F intake. The efficiency figures shown are the submittal's non-ducted ratings; separate mixed and ducted columns are published on the sheet.
Condenser & Indoor Unit Features
MXZ-5D42NL Outdoor Condenser
- Accepts 51,000 BTU/h of connected indoor capacity — the most in the range
- Maximum heating output of 53,600 BTU/h at 47°F
- Maximum cooling output of 43,000 BTU/h
- Longest piping reach in the range at 262 ft total combined length
- 30,500 BTU/h maximum heating at 17°F and 25,000 BTU/h at 5°F
- Serves up to five independently controlled zones
- Low-GWP R-454B refrigerant with a 6 lb 3 oz factory pre-charge
- 82 ft to the furthest indoor unit with 49 ft height difference either way
- 19.30 SEER2 with a 9.10 HSPF2 heating rating
- kumo cloud compatible for whole-system app control
Wall-Mount and Ceiling Cassette Options
- Capacity budget supports large units in the mix, not just small ones
- MSZ-GX wall-mount heads from 6K through 24K BTU
- Every MSZ-GX head includes a wireless remote controller as standard
- SLZ-AF09NL, AF12NL, AF15NL and AF18NL four-way ceiling cassettes
- SLP-18FAU grille included with each cassette selection
- Cassettes finish flush in a standard 24" x 24" ceiling grid
- Four-way discharge for even coverage in large square rooms
- Integral drain-up pump lifts condensate up to 33 inches
- Long-life air filter included on the cassettes
- Any mix of wall-mount and cassette across the five zones
Specifications & Manuals
On a system this size the submittal sheet, the Indoor / Outdoor Unit Compatibility Table in the MXZ Multi Technical Specifications, and the SLZ document set should all be reviewed before any material is ordered — they define the 51,000 BTU/h capacity ceiling, every approved indoor model, and the cassette ceiling requirements. The 152 lb condenser should sit on a rated condenser pad, wall mount or tie down.
Frequently Asked Questions
How does this differ from the other five-zone MXZ condenser?
Capacity and reach. This model accepts 51,000 BTU/h of connected indoor capacity against 41,000 on the MXZ-5D36NL, reaches 53,600 BTU/h maximum heating versus 43,000, and allows 262 feet of total piping instead of 230. It also needs a 40-amp circuit rather than 25. Choose the 5D36NL for five modest rooms and this one when the rooms are large.
Why is the recommended breaker 40 amps when the other multis use 25?
Higher capacity means higher current. This condenser lists a 39.2 A minimum circuit ampacity and 67 A maximum overcurrent protection, against 28.7 A and 48 A on the three and four zone models. That is a meaningful difference at the panel — verify available capacity and conductor sizing for the run length before ordering.
Can I run several 18,000 BTU cassettes on this system?
The 51,000 BTU/h ceiling makes it the only condenser here where that is realistic — two SLZ-AF18NL cassettes total 36,000, leaving 15,000 for the remaining zones. Confirm the exact combination against the compatibility table in the technical specifications, and remember each cassette needs its own separately selected controller.
Why is EER2 lower than on the smaller five-zone unit?
The submittal lists 9.30 EER2 here against 12 on the MXZ-5D36NL, while SEER2 is essentially the same at 19.30 versus 19.20. EER2 reflects efficiency at peak cooling load, so this condenser costs somewhat more to run on the hottest afternoons while performing comparably across the season as a whole.
Is 262 feet of piping enough for a large house?
Usually, but it needs planning. Divided across five runs it averages roughly 52 feet per zone, with no single run over 82 feet and 49 feet of height difference allowed. Placing the condenser centrally rather than at a corner of the building is what makes the budget work on a large footprint.
What does the 10 year warranty cover?
The listed term is 10 years on this system. Mitsubishi's extended coverage generally depends on registration within the required window after installation and on installation by a qualified contractor — confirm the current terms and register promptly rather than assuming the full term applies automatically.
MXZ-5D42NL Submittal SheetMXZ Technical SpecificationsMXZ Installation InstructionsMXZ Parts ManualMXZ Service ManualMSZ GX Technical SpecificationsMSZ GX Installation InstructionsMSZ GX Operation InstructionsMSZ GX Parts ManualSLZ Technical SpecificationsSLZ Installation InstructionsSLZ Service ManualSLZ Parts List
