M&E contractors and engineers often need compact, dependable indoor units for commercial zones—such as meeting rooms, clinics, or breakout spaces. Mitsubishi Electric’s Mr. Slim P-Series and related light-commercial ducted solutions offer a full set of options: wall-mounted, ceiling cassettes, under-ceiling, floor, and medium-static ducted units delivered with precise performance. This guide covers every product type, relevant specifications, installer-focused insight, and fault-finding tips.
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Overview of P-Series and Related Indoor Units
The Mr. Slim P-Series is Mitsubishi Electric’s compact light-commercial range. It’s a go-to solution for commercial upgrades and fit-outs where small zones need controlled comfort without oversized VRF indoor units or extensive Ductwork.
Variants include:
- Wall-mounted units (e.g. PKA Series)
- Ceiling-recessed cassettes (PLA Series)
- Ceiling-suspended units (PCA Series)
- Horizontal low- or mid-static ducted handlers (PEAD, PEA)
- Multi-position air handlers (PVA)
These units support controlled environments, precise operation, and integration with outdoor compressors including single-zone heat pumps or multi-zone systems.
Product Types and Specifications
Wall-Mounted (PKA Series)
Ideal for small offices or consultation rooms:
- Capacities roughly from 3.5 to 12 kW (12,000 to 42,000 BTU/h)
- Silent DC fan motors
- Hyper-Heating models (H2i) available for colder climates [9][2]
Ceiling-Recessed Cassette (PLA Series)
Flush-fit for suspended ceilings:
- Multi-direction airflow
- Bluetooth or wired controllers optional
- Offers comfort in open small-space ceilings [16]
Ceiling-Suspended (PCA Series)
For high-ceiling zones like commercial kitchens or larger meeting spaces:
- Easier installation with overhead clearance
- Good airflow distribution without ductwork [2]
Horizontal Low/Mid-Static Ducted (PEAD / PEA Series)
For concealed air delivery over short to medium ducts:
- PEAD-M: 5.0–14.0 kW, 35–125 Pa external static pressure
- PEA-M GAA/HAA: Up to 14 kW, static up to 150 Pa
- PEA-M HAA two-piece design for tight attic installs [1][17][14]
Multi-Position Air Handlers (PVA Series)
Flexible orientation for routing around services:
- Suits light commercial zones
- Compact for high-traffic or structural ceilings [2]
Installation Insights
- Low-Profile Units like PEAD-M are only 250 mm high—critical in shallow ceilings. [17]
- Use two-piece HAA models where ceiling access is tight. [17]
- Keep at least 600 mm clearance for filter and drain access.
- Position units considering control convenience—H2i models deliver near full capacity in -10°C external temperature. [9]
- Verify condensate pump lift requirements (up to 700 mm). [17]
Commissioning & Fault Q&A
Q: Unit won’t power on. No display
- Power check: confirm isolation fuse and terminal block tightness.
- Controller wiring: ensure correct polarity on wired remotes.
Q: Indoor unit motors quite loud
- First check: filter clean, fan speed correct to static pressure.
- For models with DC fans, assure correct voltage and wave-form to controller.
Q: Poor airflow from cassette unit
- Inspect filters, confirm motor speed, and test damper alignment.
- If dampers sticky, remove and clean.
Q: Condensate pump error
- Could be pump failure or float misalignment.
- Flush the pan, test voltage, and manually operate float to test.
Project Example: Clinic Fit-Out in Reading
The installer used:
- PKA wall units in consultation rooms
- PLA cassette in staff corridor
- PEAD-M ducted handler for a lobby split zone
Installed over two days. Controllers set to legal-setback schedules. Condensate routes confirmed and tested. H2i unit maintained full heat at low external temps.
When to Use Mr. Slim P-Series vs VRF Indoor Units
Choose P-Series when:
- You have standalone zones with no heatpump network
- Ceiling is shallow or full VRF wiring is impractical
- Cooled/heated by multi-zone outdoor unit isn’t required
For connected VRF systems, stick with dedicated VRF indoor units to optimize control and warranty.
Related Pages
References
[1] Mitsubishi Electric PEAD-M / PEA ducted specs (Aus site)
[2] Mitsubishi Electric P-Series overview – Mr. Slim brochure
[9] Mr. Slim P-Series H2i Hyper-Heating performance PDF
[14] Mitsubishi Electric ducted unit options (PEA series)
[16] Mr. Slim low-profile ceiling cassette dimensions PDF
[17] Mitsubishi Electric Australia ducted brochure – static pressures
Dr. Julian Carter
Dr. Julian Carter is a highly experienced thermal systems expert with over 15 years in the field, holding a PhD in thermal systems. His career spans academic research, consulting, and teaching, focusing on air conditioning and refrigeration systems. Dr. Carter bridges the gap between theoretical advancements and practical applications, providing expert insights to organisations like ClimateWorks, where his guidance informs decision-making and industry best practices. Notably, he has worked on international projects with organisations such as Daikin Industries, the International Institute of Refrigeration (IIR), and the United Nations Environment Programme (UNEP). These collaborations addressed energy performance, sustainable refrigerants, and advanced cooling technologies. Currently a lecturer at Edinburgh University, Dr. Carter combines his expertise with a passion for educating the next generation of engineers and advancing climate control technologies.
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