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SMARTBOX Water Cooled Package Units
Engineering Overview for Consultants, D&C Contractors & Facilities Managers
The SMARTBOX Water Cooled Package Unit (WCPU) range from Oceania Solutions Group represents a fully customisable, double-skin water-cooled DX packaged solution engineered for Australian commercial and institutional projects.
Unlike generic imported PAC units, SMARTBOX units are locally configured around:
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Double-skin EN1886 TB2 casing construction
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AHRI-certified coil technology
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EC plug fan airflow systems
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DOL or VSD scroll compressor platforms
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Carel pCO5 microprocessor control architecture
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Multi-refrigerant flexibility including R452B
This platform is designed to bridge the gap between standard off-the-shelf PACs and fully bespoke chilled water AHU systems.
Engineering Summary – Product & Applications
SMARTBOX WCPUs are direct expansion (DX) water-cooled packaged air conditioners operating on condenser water loops.
From a design standpoint, they provide:
• A plantroom-friendly alternative to central chilled water plant
• A high-efficiency replacement for ageing water-cooled PAC systems
• A compact solution where cooling towers already exist
• A customisable footprint-controlled plant for constrained retrofits
Nominal Performance Range (Page 3 Quick Reference Table)
The published capacity envelope includes
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Cooling capacity: 19 kWr → 345 kWr
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Heating capacity: 23 kWr → 401 kWr
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Nominal airflow: 850 l/s → 16,310 l/s
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Single to four refrigerant circuits
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1–4 compressors (DOL or VSD)
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1–4 EC plug fans depending on size
This wide envelope allows consultants to quickly shortlist viable units for:
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Commercial offices
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Retail & shopping centres
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Hospitals & healthcare
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Education facilities
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Mixed-use developments
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High ambient / tropical climates
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Retrofit projects requiring plantroom upgrades
Recent project references (Page 8) include Logan Hospital, Wesley Hospital, Robina Town Centre and Energy House NT
Why This Technical Data Matters (Designer & Contractor Value)
This brochure is not marketing fluff — it provides design-stage selection data engineers can immediately use.
a) Defined Design Conditions
The Quick Reference Table (Page 3) provides:
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On coil: 26.7°C DB / 19.4°C WB
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Off coil supply air conditions
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Condenser water in: ~29.4–29.5°C
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Condenser water out: 35°C
027_Smartbox Watercooled PAC Un…
This allows:
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Psychrometric validation
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Dehumidification checks
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Cooling tower duty confirmation
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Condenser loop temperature compliance
For consultants working in Queensland or NT high ambient zones, these reference points are critical.
Mechanical Construction & Compliance
Double Skin Panel Construction
Standard construction includes
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25mm polyurethane panel (40 kg/m³ density)
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0.55mm external & internal PPGI skins
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Optional 50mm or 75mm profiles
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EN1886 TB2 standard (TB1 optional)
Thermal break aluminium profiles (50mm & 75mm) are available with PVC sleeve to prevent cold bridging.
This is significant for:
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Condensation control in humid climates
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Acoustic breakout reduction
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Energy performance compliance
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NCC Section J alignment
Drain Pan & Hygiene
Drain system features (Page 6) include
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Stainless steel 304 drain pan
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Sloped design
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1½” drain connection
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AS/NZS 3666 compliance
This makes the unit suitable for healthcare and higher hygiene environments when specified correctly.
Coil Technology
Heat exchanger coils are:
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AHRI 410-2001 certified
027_Smartbox Watercooled PAC Un…
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Aluminium fins mechanically bonded to ½” copper tubes
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Optional 5/8” copper
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Stainless 304 coil frames available
For consultants, AHRI certification supports:
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Independent performance validation
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Reduced performance risk in D&C submissions
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Improved specification defensibility
Fans, Motors & Airflow Strategy
Standard airflow solution:
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Ziehl-Abegg EC plug fans
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1–4 fans depending on model
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Variable airflow capability
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ISO 1940 dynamically balanced
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AMCA certified options
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Motors from IE2 → IE4 (MEPS compliant)
This gives:
• Improved part-load efficiency
• Reduced acoustic signature
• VAV compatibility
• Electrical efficiency alignment
For contractors, EC plug fans reduce belt maintenance and improve commissioning stability.
Compressor & Refrigeration Platform
Two primary compressor strategies:
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DOL scroll compressors (WCPF Series)
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Variable Speed Drive scroll compressors (WCPV Series)
Features include:
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Single or multiple circuits
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Project-specific capacity sizing
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Multi-refrigerant compatibility
This modularity supports:
• Staged redundancy
• Load diversity
• Energy optimisation
Controls & BMS Integration
Control architecture includes:
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Carel pCO5 controller
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HLI capability
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Optional BACnet
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Circuit breakers, overloads, isolators
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Inverter drives
This supports:
• BMS integration
• Real-time monitoring
• Modulated capacity control
• Reduced overshoot cycling
For D&C contractors, this simplifies integration and handover documentation.
Refrigerant Strategy – R452B Transition
SMARTBOX supports multiple refrigerants including:
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R410A (standard)
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R452B (low GWP option)
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R32
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R454B
Why R452B Matters
R452B delivers:
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~67% GWP reduction vs R410A
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Up to ~5% efficiency improvement
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Low temperature glide
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A2L mild flammability classification
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High ambient performance compatibility
For Australian designers transitioning toward lower GWP compliance pathways, this is strategically important.
Optional Accessories & Customisation
SMARTBOX offers:
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Coil treatments
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UV lights
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Magnehelic gauges
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Service lights
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Actuators
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Double stage door handles
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Horizontal hanging brackets
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Custom filters G3 → H14
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Stainless or epoxy dampers
027_Smartbox Watercooled PAC Un…
Filter range supports:
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Pre-filters (G3–M5)
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Deep bed filters (M6–F9)
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Cleanroom grade (H13–H14)
This flexibility makes the platform viable for:
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Healthcare
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Laboratory
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Food processing
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Data & electronics
When Should Engineers Specify SMARTBOX?
SMARTBOX WCPUs are particularly suited to:
Retrofit plantroom upgrades
Buildings with existing condenser water loops
Projects requiring EN1886 double skin construction
Installations requiring AHRI coil certification
Projects transitioning toward lower GWP refrigerants
Sites requiring acoustic and dimensional customisation
Design-Stage Takeaway
SMARTBOX is not a fixed catalogue PAC.
It is a custom-engineered, double-skin, AHRI-backed, EC-fan water-cooled DX platform designed for Australian compliance, climate and retrofit complexity.
For consultants and D&C contractors, the published data provides:
• Real airflow vs capacity relationships
• Defined coil design conditions
• Confirmed water loop assumptions
• Mechanical casing standards
• Refrigerant pathway options
• Electrical & controls integration clarity
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