District Cooling ExpertsFCU, AHU & ETS Engineering
Specialized maintenance for Chilled Water Systems. We service Actuators, Valves, and Heat Exchangers in Dubai's high-rise towers.
- 1. Fan Coil Unit (FCU) Maintenance
- 2. Air Handling Unit (AHU) Services
- 3. Fresh Air Handling Unit (FAHU)
- 4. ETS Room Heat Exchanger Flushing
- 5. Chilled Water Valve & Actuators
Past Work & Diagnostics
Recent successful projects involving Actuator replacement, HEX flushing, and Hydraulic balancing across Dubai.
Fan Coil Unit (FCU) Retrofit
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Diagnosis & Solution
Diagnosed 'No Cooling' issue. Found the 2-way actuator valve was seized in the closed position. Replaced with a new Honeywell actuator and cleaned the Y-strainer.
ETS Heat Exchanger Flushing
Diagnosis & Solution
Building faced low heat transfer efficiency. Performed Clean-in-Place (CIP) chemical flushing on the Plate Heat Exchanger (HEX) to remove calcium fouling.
FAHU Actuator & Damper
Diagnosis & Solution
Fresh Air unit was supplying humid air. Calibrated the modulating damper actuator and replaced the enthalpy wheel belt to restore energy recovery.
Chilled Water Leak Repair
Diagnosis & Solution
Rectified severe condensation and dripping from main riser pipes. Removed soaked insulation, treated pipe corrosion, and applied new Armaflex cladding.
Air Lock & Hydraulic Balancing
Diagnosis & Solution
Top floor was not cooling. Identified air lock in the hydraulic network. Purged air via automatic air vents (AAV) and balanced system pressure.
Live Telemetry & Logistics
Real-time coordination of our 17 HVAC specialist teams across Dubai.
District Cooling Engineering & Hydraulics
We provide advanced engineering solutions for Chilled Water Systems. Our technicians are trained on FCU, AHU, and ETS Room hydraulics to ensure maximum Delta-T efficiency.
1Fan Coil Unit (FCU)
The primary cooling unit for bedrooms, living rooms, and offices.
Technical Information
Connected to the district cooling network. It contains no compressor, only a chilled water coil and a blower fan.
Working Principle
Chilled water flows through the coil; the fan blows air over it to cool the room. Temperature is regulated by an actuator valve stopping water flow.
Service Protocols & Engineering Solutions
Cleaning & Hygiene
- Strainer basket removal & cleaning
- Deep coil disinfection & degreasing
- Drain pan sludge removal
Hydraulic Repair
- 2-Way/3-Way Actuator Valve replacement
- Thermostat communication logic
- Blower motor bearing replacement
2Air Handling Unit (AHU)
High-static pressure units for malls, lobbies, and large halls.
Technical Information
Located in dedicated mechanical rooms. These handle large volumes of air and require heavy-duty belt-driven motors.
Working Principle
Receives high-flow chilled water from the main risers. Uses large V-bank filters to purify air before cooling it across a massive coil surface.
Service Protocols & Engineering Solutions
Heavy Maintenance
- V-Belt tensioning & laser alignment
- Pillow block bearing lubrication
- Vibration analysis
Technical Services
- Large-scale chemical coil washing
- Differential pressure sensor calibration
- Variable Frequency Drive (VFD) tuning
3Fresh Air Handling Unit (FAHU)
Treats outdoor air to pressurize the building and provide ventilation.
Technical Information
Critical for Indoor Air Quality (IAQ). It cools hot outdoor air before injecting it into the building's corridors.
Working Principle
Uses a 'Heat Wheel' to recover energy from exhaust air. Regulates humidity and temperature using modulating damper actuators.
Service Protocols & Engineering Solutions
Energy Recovery
- Heat Wheel cleaning & belt replacement
- Fresh air damper adjustment
- Sand trap louvre cleaning
Filter Management
- Bag filter replacement (F7/F9)
- Panel filter washing
- Differential pressure monitoring
4Energy Transfer Station (ETS)
The heart of the building's cooling infrastructure.
Technical Information
The interface between the District Cooling Provider (e.g., Empower/Tabreed) and the building's internal water loop.
Working Principle
Uses massive Plate Heat Exchangers (HEX) to transfer cold energy from the provider's water to the building's water without mixing them.
Service Protocols & Engineering Solutions
Heat Exchanger Services
- Clean-in-Place (CIP) chemical flushing
- Back-flushing to remove debris
- Gasket leak checks
System Efficiency
- Delta-T performance analysis
- Primary/Secondary pump staging
- Bypass valve calibration
5Control Valves & Hydraulics
The 'Brain' of the chilled water flow management system.
Technical Information
Hydraulic balance is essential. Stuck valves cause 'Low Delta-T Syndrome', leading to penalties from cooling providers.
Working Principle
Pressure Independent Control Valves (PICV) and Motorized Actuators regulate water flow to match the exact cooling load required.
Service Protocols & Engineering Solutions
Valve Engineering
- PICV cartridge replacement
- Actuator motor torque testing
- Gate valve gland packing
Flow Dynamics
- Air purging from chilled water risers
- System pressure balancing
- Automatic Air Vent (AAV) replacement
Hydraulic Efficiency & Hygiene
Clogged strainers and scale buildup reduce chilled water flow, leading to warm rooms and high bills. Our 60% focus is on Hydraulic Maintenance and cleaning protocols.
Hydro-Jet Strainer & Coil Cleaning
Sludge in your pipes blocks water flow. We remove the Y-strainer mesh, hydro-jet the coil, and restore full hydraulic circulation.
Duct & ETS Room Sanitization
Damp FCU environments breed mold. We sanitize ducts and deep-clean mechanical ETS rooms to ensure hospital-grade air quality.
Preventive Valve & Actuator Check
Avoid 'Low Delta-T' penalties. We inspect every actuator valve to ensure it closes tightly when cooling is not required.
Transparent Pricing
Honest Pricing. No Hidden Fees. VAT Included.
Basic FCU Service
- Filter & Strainer cleaning
- Thermostat check
- Drain flow test
- Technician Transport
Deep Hydraulic Flush
- Coil chemical foam wash
- Strainer hydro-jetting
- Actuator inspection
- Before/After Report
Valve Replacement
- Actuator Motor Supply
- Valve Body installation
- Wiring & Logic Setup
- Flow Testing
Project Showcase
Real diagnostic results from residential and commercial towers across Dubai.
Villa in Jumeirah Islands - Air Lock Issue
Operational Failure Upper floor FCUs blowing warm air despite thermostat set to 20°C.
Technical Solution Identified massive air lock in the riser. Performed air bleeding and pressure balancing.
Chilled water circulation restored. Exit temperature dropped to 21°C.
Office in Business Bay - Low Delta-T
Operational Failure High cooling bills from Empower due to Low Delta-T syndrome.
Technical Solution Found 12 stuck-open actuator valves bypassing the coil. Replaced with new Belimo actuators.
Delta-T efficiency restored. Monthly penalty fees eliminated.
The Digital Health Report
We don't just say we fixed it; we prove it. Every service visit concludes with a comprehensive technical PDF report sent directly to your device.
Before & After Photos
Visual proof of cleaning and technical repairs.
Instant Digital Delivery
Receive your asset's full history via WhatsApp & Email.
Service Report #4921
October 2024
Diagnosis Notes:
Strainer hydro-jet cleaned. Actuator torque verified. Chilled water flow restored to 12.5 GPM.
Tailored DCS Care for Every Space
From residential towers to massive commercial districts, we have the specialized tooling for every chilled water environment.
Apartments & Offices
Specialized Fan Coil Unit (FCU) maintenance. We resolve seized actuators and clogged strainers to eliminate air locks and restored temperature stability.
Malls & Lobbies
Heavy-duty Air Handling Unit (AHU) services. Precision belt alignment, pillow block bearing lubrication, and high-static pressure coil washing.
Building Infrastructure
Full-scale Energy Transfer Station (ETS) maintenance. Advanced Plate Heat Exchanger (HEX) flushing to recover critical heat transfer efficiency.
UNITECH DCS Specialists
District Cooling Engineers in Dubai • Open 24 Hours
Facility Manager
Local Guide • 2 days ago
UNITECH understands the ETS room complexities. Their CIP flushing of our Plate Heat Exchangers improved our heat transfer efficiency by 40%.
Mr. James
Local Guide • 3 days ago
I had water dripping from my FCU access panel. They found the drain pan was blocked with sludge. Hydro-jetted it and re-insulated the pipes.
Sarah Al-Maktoum
Local Guide • 1 week ago
The digital report showing the 'Before' and 'After' of the strainer cleaning was impressive. The AC is finally silent and cold.
Frequently Asked Questions
Do you serve commercial buildings?
Yes, we specialize in Rooftop Package Units for malls, offices, and warehouses.
Is your work guaranteed?
Yes, we provide a 1-month warranty on service and up to 1-year warranty on replaced compressors.
How quickly can you arrive?
For emergencies in Dubai, our target arrival time is under 90 minutes.
Why is chemical cleaning necessary?
Water alone cannot remove the salt and dust cemented onto the aluminum fins. Chemical foam lifts this grime to restore heat exchange efficiency.
