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Commercial HVAC-R Products: Air-Conditioning, Refrigeration & Heat Pumps

We design, supply, install, and maintain multi-split/dual-zone, ducted and cassette air-conditioning, commercial refrigeration (cold & freezer rooms, walk-ins, display cabinets), and energy-saving heat-pump hot-water systems—engineered for uptime, energy efficiency, and compliance across South Africa.

Air-Conditioning Systems

Key Benefits

  • Right-sized multi-split, dual-zone, ducted & cassette for commercial spaces
  • Inverter efficiency and low noise for steady comfort & lower kWh
  • Optional BMS/Modbus control for central scheduling & monitoring

Technical Highlights

  • 2–8 indoor units per outdoor (model dependent)
  • Long line-set options, high-lift drain pumps, coastal-grade coils
  • 230V/1-ph and 400V/3-ph, R32/R410A (per model & compliance)

Right-sized commercial air-conditioning for offices, retail, hospitality, healthcare, and light industrial—covering multi-split, dual-zone, ducted, and cassette systems with inverter efficiency and quiet operation.

Key Features

  • System Types: multi-split/dual-zone, ceiling cassette, slim ducted, wall splits, rooftop package (where suitable).
  • Controls: wired/wireless room stats, central schedulers, BMS integration (Modbus/BACnet gateways), lockouts & setpoint bands.
  • Efficiency & Comfort: inverter compressors, after-hours setback, low-noise indoor units, coastal/anti-corrosion options.

Design & Sizing

  • Room-by-room heat load (sensible/latent), occupancy, internal gains, glazing & orientation.
  • Choose indoor type per space (cassettes for open-plan, ducted for discreet/quiet rooms, wall units for quick installs).
  • Confirm electrical (1-ph/3-ph), line lengths, level differences; follow manufacturer rules for branches, traps, insulation.

Applications

  • Offices/boardrooms, retail & restaurants, clinics/education, small warehouses & IT rooms.

Maintenance (SLAs)

Filters/coils/drains, leak checks, diagnostics, controller verification; priority call-outs and reporting.

Why Ventilation Matters
Fresh air reduces CO₂ and VOC build-up, supports comfort and productivity, and protects temperature-critical spaces by managing humidity and pressure.

Systems We Provide

  • Fresh-Air Supply (FAU): tempered outdoor air ducted to zones or to ducted AC return.
  • HRV/ERV: heat/energy recovery to cut kWh while meeting fresh-air targets.
  • Extract Systems: bathrooms, kitchens, store rooms, and point extraction for odours/particulates.

Design & IAQ

  • Airflow rates set from occupancy & floor area; target comfortable CO₂ levels and humidity control.
  • Filtration: G4–MERV/M5–MERV for general areas, higher grades where hygiene needs it; allow service access.
  • Pressure Strategy: neutral/slight-positive for occupied zones; balanced extract where required.
  • Noise & Location: lined duct, low-SPL fans, weather-protected intakes/exhausts.

Integration with AC

  • Mix FAU with ducted AC or deliver directly to space; interlock fans with AC schedules; monitor via BMS where installed.

Maintenance (SLAs)

  • Filter changes/cleans, belt & fan checks, coil hygiene on tempering coils, damper function tests, airflow re-verification.

Good Use Cases

Open-plan offices & classrooms (CO₂ control), clinics & kitchens (extract + make-up air), retail floors (comfort + odour control).

VRF / VRV (Two-Pipe) Heat-Pump Schematic — How it works

A single outdoor unit modulates refrigerant flow to multiple indoor fan-coil units. All zones run in the same mode (cool or heat) at a time. The dark line = liquid and the light line = gas; refrigerant is distributed along the main header and branched to each indoor. Each indoor unit has its own electronic expansion valve (EEV) to control capacity, while the outdoor inverter compressor varies output to match total load.

Callouts in the diagram

  1. Outdoor unit & controls – inverter compressor, heat exchanger, and control valves manage total capacity and mode.
  2. Indoor fan-coil with EEV – meters refrigerant to the coil for precise room control; arrows show conditioned air supply.

Design notes (quick)

For simultaneous heating & cooling, use a heat-recovery (3-pipe) system with branch selector (not shown here).

Keep branch tees within the manufacturer’s geometry; respect max pipe lengths/level differences.

Nitrogen purge while brazing, insulate liquid/gas lines correctly, add oil traps on tall risers.

Cold & Freezer Rooms, Walk-Ins, Display Cabinets, Condensing Units

Operational Benefits

  • Stable, food-safe temperatures with near-zero downtime design
  • Remote/onsite monitoring for audits and QA
  • Rapid breakdown response with spares support

System Scope

  • Cold & freezer rooms, glass-door walk-ins, display cabinets
  • Efficient condensing units with smart defrost & lighting
  • Hygienic finishes, durable hardware, correct airflow management

Food-safe, energy-efficient commercial refrigeration: cold rooms, freezer rooms, glass-door walk-ins, display cabinets, and remote/ integral condensing units—engineered for stable temperatures, near-zero downtime, and tidy maintenance access.

System Scope

  • Rooms & Enclosures: insulated panels, vapour barriers, heated door frames/gaskets (freezers), floor insulation options.
  • Cooling Plant: remote or integral condensing units, matched evaporators (air coolers), defrost control (electric or hot-gas).
  • Controls: digital controllers, temperature probes, anti-short-cycle, door switches, lighting control, alarm outputs.

Performance & Efficiency

  • Correct duty sizing for product load, pull-down time, ambient, and door-open frequency.
  • EC fans, case lighting, smart defrost scheduling, door-heater optimisation, night curtains (displays).
  • Optional heat reclaim (from discharge gas) for space or DHW pre-heat.

Operations & Service

SLA options: coil cleans, door-seal checks, probe calibration, refrigerant management, rapid breakdown response.

Good airflow paths (no blocked returns), proper drain & coil hygiene, tidy cable/pipe runs, service clearances.

Why it matters
Continuous logging protects stock, simplifies audits (HACCP/food safety), and shortens fault-finding—reducing wastage and downtime.

What we provide

  • Temperature & door monitoring with alarms (local + remote options).
  • Data logging & reports (PDF/CSV) for audits; probe calibration schedule.
  • Event alerts: high/low temp, prolonged door open, defrost fail, power restore.

Best practices

Integrate with BMS/cloud dashboards where required.

Place food simulant probes at representative points (not against coil/door).

Define alarm setpoints & delays per product category; escalation path to on-call.

Remote Cold-Room Refrigeration — Typical DX Piping Schematic

diagram shows a remote condensing unit serving a walk-in cool room. Refrigerant leaves the compressor → rejects heat in the condenser → stores in the receiver → travels down the liquid line (through filter-drier, moisture/sight glass, solenoid and service valves) → meters at the TXV into the evaporator inside the room → returns via the suction line to the compressor. A temperature sensor feeds the controller to maintain setpoint; the room includes a pressure/relief vent for safe door operation.

Key callouts

  • Liquid line: receiver → filter-drier → sight/moisture glass → solenoid valve → shut-off/service valve → TXV.
  • Evaporator: fans circulate air; condensate drains; defrost (electric or hot-gas) per spec.
  • Controls: digital controller with high/low temp alarms; door switch optional for lights/fan interlock.

Design notes

Maintain service clearances; keep airflow paths unobstructed.

Size duty for product load, pull-down time, ambient, and door-open cycles.

Trap/insulate drains; heat the drain & door frame on freezer applications.

Cold & Freezer Rooms, Walk-Ins, Display Cabinets, Condensing Units

Operational Benefits

  • Stable, food-safe temperatures with near-zero downtime design
  • Remote/onsite monitoring for audits and QA
  • Rapid breakdown response with spares support

System Scope

  • Cold & freezer rooms, glass-door walk-ins, display cabinets
  • Efficient condensing units with smart defrost & lighting
  • Hygienic finishes, durable hardware, correct airflow management

Food-safe, energy-efficient commercial refrigeration: cold rooms, freezer rooms, glass-door walk-ins, display cabinets, and remote/ integral condensing units—engineered for stable temperatures, near-zero downtime, and tidy maintenance access.

System Scope

  • Rooms & Enclosures: insulated panels, vapour barriers, heated door frames/gaskets (freezers), floor insulation options.
  • Cooling Plant: remote or integral condensing units, matched evaporators (air coolers), defrost control (electric or hot-gas).
  • Controls: digital controllers, temperature probes, anti-short-cycle, door switches, lighting control, alarm outputs.

Performance & Efficiency

  • Correct duty sizing for product load, pull-down time, ambient, and door-open frequency.
  • EC fans, case lighting, smart defrost scheduling, door-heater optimisation, night curtains (displays).
  • Optional heat reclaim (from discharge gas) for space or DHW pre-heat.

Operations & Service

SLA options: coil cleans, door-seal checks, probe calibration, refrigerant management, rapid breakdown response.

Good airflow paths (no blocked returns), proper drain & coil hygiene, tidy cable/pipe runs, service clearances.

Why it matters
Continuous logging protects stock, simplifies audits (HACCP/food safety), and shortens fault-finding—reducing wastage and downtime.

What we provide

  • Temperature & door monitoring with alarms (local + remote options).
  • Data logging & reports (PDF/CSV) for audits; probe calibration schedule.
  • Event alerts: high/low temp, prolonged door open, defrost fail, power restore.

Best practices

Integrate with BMS/cloud dashboards where required.

Place food simulant probes at representative points (not against coil/door).

Define alarm setpoints & delays per product category; escalation path to on-call.

Remote Cold-Room Refrigeration — Typical DX Piping Schematic

diagram shows a remote condensing unit serving a walk-in cool room. Refrigerant leaves the compressor → rejects heat in the condenser → stores in the receiver → travels down the liquid line (through filter-drier, moisture/sight glass, solenoid and service valves) → meters at the TXV into the evaporator inside the room → returns via the suction line to the compressor. A temperature sensor feeds the controller to maintain setpoint; the room includes a pressure/relief vent for safe door operation.

Key callouts

  • Liquid line: receiver → filter-drier → sight/moisture glass → solenoid valve → shut-off/service valve → TXV.
  • Evaporator: fans circulate air; condensate drains; defrost (electric or hot-gas) per spec.
  • Controls: digital controller with high/low temp alarms; door switch optional for lights/fan interlock.

Design notes

Maintain service clearances; keep airflow paths unobstructed.

Size duty for product load, pull-down time, ambient, and door-open cycles.

Trap/insulate drains; heat the drain & door frame on freezer applications.

Energy-Saving Heat-Pump Geysers & Plant Integrations

Business Benefits

  • High-COP hot-water generation to cut energy costs
  • Consistent supply for hotels, gyms, kitchens & multi-site facilities
  • Tariff-friendly scheduling and integration with existing plant

System Details

  • Standalone heat-pump geysers or cylinder integrations
  • Cascade options for large demand profiles
  • Noise-managed indoor/outdoor modules with condensate control

High-COP heat-pump hot-water systems that cut kWh versus electric elements while keeping supply stable for hotels, gyms, kitchens, hostels, and multi-site facilities.

System Options

  • Standalone heat-pump geysers (all-in-one or split condenser/evaporator).
  • Cylinder integrations with existing storage tanks (buffer or primary).
  • Plant integrations with multiple HP units in cascade for large demand.

Performance & Control

  • COP typically 2.5–4.0 (site & model dependent).
  • Smart scheduling/tariff windows, anti-legionella pasteurisation cycles, and temperature setpoint control via onboard or BMS.
  • Quiet operation options; weather-protected housings for outdoor install.

Maintenance (SLAs)

Coil/fin cleaning, condensate management, anode inspection, sensor & valve checks, performance tests; spares and rapid response.

What “heat recovery” means
Capturing waste heat from cooling equipment and using it to pre-heat or fully heat domestic hot water (DHW) or process water—reducing compressor runtime on dedicated water-heating plant.

Common recovery sources

  • VRF/VRV heat-recovery systems: desuperheater or dedicated DHW heat-recovery module takes compressor discharge heat.
  • Commercial refrigeration (cold rooms / display cases): hot-gas heat reclaim via a plate or coaxial heat exchanger placed upstream of the condenser.
  • Chiller/AC plants: condenser-water or rejected heat streams repurposed for DHW pre-heat.

Integration patterns

  • Pre-heat + Heat-Pump finish: recover heat lifts water (e.g., 20–40 °C) → heat pump tops up to setpoint (e.g., 60 °C).
  • Parallel boost: when recovery is available, reduce HP load; HP resumes when recovery falls short.
  • Seasonal / demand-based: prioritise recovery when cooling load is present; default to HP in low-cooling periods.

Controls & safety

  • Prioritise recovery first, with automatic switchover to heat pump when recovery temp or flow is insufficient.
  • Fit mixing (TMV) anti-scald valves; maintain pasteurisation cycles (≥60 °C) for legionella risk management.
  • Instrument with supply/return sensors, flow switch, and BMS points (run status, temps, energy, alarms).

Design notes

  • Size the HX and primary pump for expected discharge heat and target ΔT; insulate all hot lines.
  • Ensure no condensing in compressors (follow OEM reclaim limits, superheat requirements).
  • Provide bypass around the recovery HX for maintenance and low-load conditions.
  • In supermarkets/hotels, recovery can cover a large share of DHW during trading hours.

Where it shines
Hotels, gyms, laundries, restaurant kitchens, supermarkets—sites with coincident cooling + hot-water demand.

VRF Heat-Pump System — How it Works

This schematic shows a variable-refrigerant-flow (VRF) air-conditioning heat-pump serving multiple indoor coils. An inverter scroll compressor drives refrigerant through a four-way reversing valve so the system can cool or heat. The outdoor coil (with fan) acts as the condenser in cooling and the evaporator in heating. Refrigerant is distributed to each indoor heat exchanger via headers; every indoor has its own electronic expansion valve (EXV) for precise capacity control. Temperature (blue) and pressure (pink) sensors feed the controller for stable operation, superheat management, and fault monitoring.

Key callouts

  • Compressor & oil management: scroll compressor with oil separator and accumulator for reliability.
  • Reversing valve: switches flow for heating vs cooling modes.
  • Indoors: multiple fan-coil units with EXVs; fans move room air across the coil to deliver conditioned air.

Design notes

For simultaneous heat & cool, add a heat-recovery branch-selector module (not shown here) and integrate points to BMS where required.

Respect manufacturer limits on piping lengths/level differences and branch geometry.

Provide condensate management at indoor units and adequate service clearances.

Send us your scope or drawings—our engineers will right-size a multi-split / ducted / refrigeration solution with clear timelines, options, and SLA-backed maintenance.

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