Commercial HVAC Specialists — Kolkata

Professional VRV & VRF AC Installation,
Repair & Maintenance Services

One outdoor unit. Dozens of indoor zones. Precise control over every floor. Unique Aircon delivers certified VRV & VRF AC service in Kolkata for offices, shopping malls, hospitals, and large residential complexes.

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What Is VRV / VRF Technology?

VRV (Variable Refrigerant Volume) and VRF (Variable Refrigerant Flow) are two names for exactly the same advanced air-conditioning technology. Daikin — the inventor — holds the trademark on the term VRV. Every other major brand — Mitsubishi Electric, LG, Voltas, O General, Hitachi — markets the same system architecture under the name VRF.

In plain terms: a single high-capacity outdoor unit connects through a refrigerant piping network to anywhere from 2 to 64 indoor units. Each indoor unit can be switched on, off, and temperature-controlled independently — something a conventional central AC plant simply cannot do. The result is dramatic energy savings (inverter-driven compressor modulates output rather than running at full blast), precise zone comfort, and a much smaller installation footprint than ducted systems.

🏛Offices & IT ParksPer-cabin zone control, 24/7 server-room cooling🏪Shopping MallsMulti-tenant billing, anchor-store isolation🏥Hospitals & ClinicsSterile zone pressure control, 24/7 reliability🏠Luxury ResidencesSilent operation, concealed cassette & duct units

Our VRV & VRF Services in Kolkata

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1. Expert Installation & Piping Design

A VRV/VRF system is only as good as its refrigerant piping layout. Poor branch-pipe sizing causes uneven distribution, compressor strain, and capacity loss. Our engineers survey your building, calculate equivalent pipe lengths, design the branch-selector and header-pipe layout, and size every segment to manufacturer specifications before a single pipe is cut.

• Site survey and load calculation for each zone

• Refrigerant pipe routing & insulation (Armaflex / equivalent)

• Branch-selector box and header pipe installation

• Outdoor unit commissioning & BMS integration

• All brands: Daikin VRV, Mitsubishi City Multi, LG Multi V, Voltas, O General

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2. Advanced Troubleshooting & Error Diagnosis

VRF systems communicate faults through alphanumeric error codes displayed on the indoor unit and the central controller. Decoding these codes — and distinguishing a sensor fault from a real refrigerant pressure problem — requires brand-specific service software. Our technicians carry Daikin D-Checker, Mitsubishi FR-IE3, LG LGMV, and compatible diagnostic laptops to pull live system data, not just read a code off a panel.

• Live inverter frequency, suction & discharge pressure logging

• Thermistor, pressure sensor, and expansion valve testing

• Communication bus (F1/F2 wiring) continuity check

• Outdoor unit fan motor and heat-exchanger inspection

• Root-cause report with corrective action plan

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3. Pressure Testing & Refrigerant Gas Charging

VRV/VRF piping runs long distances and through ceiling voids where a leak can go undetected for months, silently degrading performance. We follow a structured three-step protocol before any refrigerant is introduced into the system — essential for new installations and post-repair work alike.

Step 1Nitrogen Pressure TestPressurize pipes to 40 kg/cm² with dry nitrogen; hold for 24 hrs to confirm zero leakStep 2VacuumisationDeep vacuum to ≤200 microns removes all moisture & non-condensables from pipingStep 3Refrigerant ChargingWeighed charge per system design (R-410A / R-32) with digital manifold verification

We use only original refrigerant gas (R-410A or R-32 as specified) — never mixed or recycled gas that degrades compressor oil and voids warranty.

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4. Jet-Pump Preventive Maintenance & Wet Servicing

A VRF system can have 20, 30, or 50 indoor units spread across an entire floor plate. Each one accumulates dust on its filter and heat exchanger, and each drain pan can clog if not cleared regularly. Our AMC (Annual Maintenance Contract) jet-pump servicing covers every indoor unit in a single scheduled visit using professional-grade high-pressure equipment — not household vacuum cleaners.

• High-pressure jet cleaning of evaporator coil (all unit types: cassette, ducted, wall, floor)

• Drain pan flushing and pipe clearance

• Filter wash and blower wheel cleaning

• Capacitor and electrical connection check

• Post-service performance test and temperature difference measurement

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5. Inverter Compressor & PCB Repair

The outdoor unit's inverter compressor and the main PCB (Printed Circuit Board) are the two most expensive components in any VRF system. A compressor replacement on a large Daikin or Mitsubishi outdoor unit can cost Rs. 80,000–2,00,000 or more. Before recommending a replacement, our engineers perform a full electrical and mechanical diagnostic to determine if the compressor can be repaired or if the PCB fault can be resolved at the component level.

• Inverter drive board component-level diagnosis (IGBT module, capacitor bank, gate resistors)

• Compressor winding resistance and insulation testing

• Scroll compressor rebuild where feasible (reduces replacement cost by 40%–60%)

• Main controller PCB and remote controller PCB repair

• Warranty-safe repair documentation provided

Brands We Service

Our technicians are trained on the service manuals and diagnostic software of all major VRV/VRF brands available in India. Whether your system is under warranty or out of it, we can help.

DaikinVRV IV, VRV WIIIMitsubishi ElectricCity Multi, R2LGMulti V 5, Multi V SVoltasVRF, Vertis+O GeneralAOHD, VRF SeriesHitachiSet Free, Utopia

Why Kolkata Buildings Need a VRF Specialist — Not a General AC Technician

Kolkata's climate — 38°C summers, high humidity, and a monsoon that can push ambient temperatures down 10°C overnight — places unusual demands on outdoor units designed for steady sub-tropical conditions. Add the city's power supply characteristics (voltage fluctuation, phase imbalance) and you have a recipe for inverter compressor failures that a technician trained only on residential split ACs is not equipped to handle.

🏙 Old Building Stock

Many Kolkata commercial buildings were built before VRF was common. Retrofitting requires careful pipe routing through constrained ceiling spaces — a planning challenge general contractors avoid.

⚡ Power Quality Issues

Voltage spikes from CESC grid switching damage inverter PCBs. We recommend and install appropriate voltage stabilisers and check earthing quality as part of every installation.

🌧 Monsoon Condensate

Kolkata's monsoon pushes indoor humidity to 85%+. Systems not sized or maintained for high latent loads develop drain-pan overflow issues. We design drainage slopes and trap sizes accordingly.

🕐 24/7 Commercial Uptime

A VRF failure in a server room or hospital can be a business emergency. We offer priority AMC response with a 4-hour SLA for critical commercial clients.

Indicative Service Charges

Final charges depend on system capacity, pipe length, brand, and site conditions. All prices include technician visit, labour, and standard consumables.

Service	System Size	Starting From
Annual Maintenance Contract (AMC)	Up to 10 indoor units	Rs. 18,000 / year
Jet-Pump Servicing (per visit)	Per indoor unit	Rs. 700 / unit
Gas Charging (R-410A)	Per kg	Rs. 2,800 / kg
PCB Repair (diagnosis + repair)	Outdoor / indoor unit	Rs. 4,500 onwards
Error Diagnosis & Repair Visit	Any system	Rs. 1,200 visit charge

* Prices valid for Kolkata & surrounding areas. Refrigerant, spare parts, and heavy compressor work billed separately at actuals. GST applicable.

Why Kolkata Businesses Choose Unique Aircon

10+Years servicing commercial AC in KolkataAllMajor VRF brands covered under one contract4 hrPriority SLA for AMC clients with critical systems100%Original refrigerant gas — no recycled or mixed supply

Frequently Asked Questions

What is the difference between VRV and VRF air conditioning?

There is no functional difference. VRV (Variable Refrigerant Volume) is a registered trademark of Daikin Industries. VRF (Variable Refrigerant Flow) is the generic industry term used by all other manufacturers — Mitsubishi, LG, Voltas, O General, Hitachi — for the same core technology. Both systems use a variable-speed inverter compressor to modulate refrigerant flow across multiple indoor units simultaneously.

How often should a VRF system in a Kolkata office be serviced?

At minimum, twice a year — once before summer (March) and once after monsoon (October). High-traffic spaces like call centers, malls, or restaurants with heavy cooking odours may need quarterly servicing. The outdoor unit heat exchanger should be inspected annually, as Kolkata's air quality (dust, diesel particulates) clogs fins and forces the compressor to work harder.

Can you service a VRF system that was installed by another company?

Yes. We take over existing systems all the time. We will conduct a comprehensive initial audit — system pressures, gas charge level, pipe insulation condition, drain pan condition, and controller settings — and provide a written health report before beginning any service work.

My VRF system is showing an error code. What should I do?

Note the code displayed on the indoor unit or central controller and call us. Do not reset the system repeatedly — some codes record fault history that is useful for diagnosis, and clearing the controller memory can lose that data. Our engineer will visit with the diagnostic laptop to read the complete fault log and carry out a live pressure and temperature check before recommending corrective action.

Do you offer AMC contracts for VRV / VRF systems in Kolkata?

Yes. Our AMC plans cover scheduled preventive maintenance visits (typically 2–4 per year), priority breakdown response, parts discounts, and a dedicated service contact. We tailor the plan to your number of indoor units, building type, and operating hours. Contact us for a custom AMC quote.

Get a Free VRV / VRF Service Quote in Kolkata

Whether you need an installation, an urgent repair, or an annual maintenance contract for your commercial building, our team is ready. Tell us your system details and we'll get back to you within 2 hours.

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