Close Control Units (CCU), Downflow Units & HVAC Maintenance

Seasonal Control Ltd provides specialist servicing, repairs and planned maintenance for Close Control Units (CCU), Downflow Units, AHUs, VAV/VAM systems, heat recovery units and commercial HVAC equipment across London, High Wycombe, Oxford, West London, North West London, Central London and surrounding regions.

These systems support mission-critical environments where precision cooling, stable airflow and reliability are essential. Our engineers specialise in data centre cooling, server room cooling, ventilation management and industrial HVAC installations.

Close Control Units (CCU) & Server Room Cooling

Close Control Units provide accurate temperature and humidity control required for highly sensitive environments. These units must operate continuously and require more frequent maintenance to prevent failures.

We Maintain CCUs For:

• Data centres & comms rooms
• Server rooms & telecom rooms
• IT suites
• Laboratories & cleanrooms
• Financial trading floors
• Medical storage & critical environments

CCU Maintenance Includes:

• Filter cleaning & replacement
• Evaporator & condenser coil cleaning
• Humidifier & dehumidifier checks
• Airflow & static pressure testing
• Electrical & PCB inspections
• Refrigerant pressure checks & leak detection
• Fan, motor & belt checks
• Drain line & pump cleaning
• Sensor & controller calibration
• Temperature & humidity accuracy testing

Downflow Unit Maintenance

Downflow Units deliver conditioned air through raised floors in data centres and technical rooms. We maintain all major Downflow systems including:

• Direct expansion downflow units
• Chilled water downflow systems
• High-efficiency cooling modules
• Pressurised underfloor cooling systems

Downflow Unit Maintenance Includes:

• Fan module inspection
• Coil cleaning
• PCB & control diagnostics
• Underfloor pressure checks
• Refrigerant & flow testing
• Humidity & temperature verification
• Filter & mesh cleaning
• Pump & drain inspection

HVAC Maintenance (AHUs, Ventilation, VAV & VAM Systems)

We provide full servicing for commercial ventilation and air movement systems that support indoor air quality, building comfort and efficiency.

Systems We Maintain:

• AHUs (Air Handling Units)
• Fresh air supply & extract systems
• MVHR / Heat recovery units
• VAM / VAV systems
• Ducted ventilation systems
• Car park extract fans
• Smoke extract & pressurisation fans

HVAC Maintenance Includes:

• Filter changes & belt tensioning
• Fan & motor inspection
• Coil & heat exchanger cleaning
• Damper & actuator checks
• Airflow & pressure balancing
• Electrical & control checks
• Ductwork visual inspections
• Control strategy adjustments

Industries We Support

• Data centres & IT facilities
• Server rooms & telecom hubs
• Trading floors & financial institutions
• Pharmaceutical & laboratory environments
• Corporate offices & retail
• Warehouses & industrial units
• Universities, schools & public sector buildings
• Hospitals & healthcare environments

Areas We Cover

We operate across London, High Wycombe, Oxford, and surrounding regions including:

• West London: Ealing, Hounslow, Fulham, Kensington, Brent, Hillingdon
• North West London: Harrow, Barnet, Wembley, Edgware, Camden
• Central London: City of London, Westminster, Islington, Holborn, Soho
• Surrounding Towns: Slough, Watford, Reading, Windsor, St Albans
• High Wycombe Region: Beaconsfield, Marlow, Amersham, Chesham
• Oxford Region: Bicester, Abingdon, Thame, Didcot

Contact Seasonal Control

For specialist Close Control, Downflow or HVAC maintenance:

📞 Call: 020 3740 2429
📧 Email: info@seasonalcontrol.co.uk
🌐 Website: www.seasonalcontrol.co.uk