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What is a VRF / VRV system, and why does maintenance matter?
In VRF (variable refrigerant flow) systems, a single outdoor unit group feeds dozens of indoor units through copper piping and a communication line. Daikin calls this technology VRV and some manufacturers call it VRS; the maintenance approach is the same.
Because the system is a single refrigerant circuit, a drain problem in one indoor unit, a dirty condenser in one outdoor unit or a small refrigerant leak affects comfort across the whole building. Scheduled maintenance is a measured check that protects the compressors and catches communication and sensor issues early.
What does VRF system maintenance include?
- Outdoor unit condenser fin cleaning
- Outdoor unit fan, motor and blade check
- Suction and discharge pressures, superheat measurement
- Compressor current and inverter drive check
- Refrigerant leak test with an electronic detector
- Reading fault codes and operating history with a service tool
- Indoor unit filter cleaning
- Indoor unit coil and fan cleaning
- Drain pan, condensate pump and line check
- Communication line, addressing and controller check
- Panel, terminal and supply voltage check
- Measured maintenance report per unit
Maintenance intervals: which task, how often?
The table below shows the typical maintenance schedule we follow on site. Exact intervals are set in the maintenance plan based on manufacturer instructions, operating hours and how intensively the facility is used.
| Job | Every 1–3 months | Semi-annual | Annual |
|---|---|---|---|
| Indoor unit filter cleaning | ✓ | ✓ | ✓ |
| Indoor unit drain and pump check | Control | ✓ | ✓ |
| Indoor unit coil and fan cleaning | — | Control | ✓ |
| Outdoor unit condenser cleaning | — | ✓ | ✓ |
| Pressure, superheat and current measurement | — | ✓ | ✓ |
| Refrigerant leak test | — | ✓ | ✓ |
| Fault code history and sensor readings | — | ✓ | ✓ |
| Communication and central controller test | — | — | ✓ |
| Panel and electrical connections | — | ✓ | ✓ |
✓: done on that visit. —: not required in that period.
Maintenance differences by system type
Heat pump VRF
All indoor units either heat or cool at the same time. At season changeover, mode settings, defrost operation and outdoor unit sensors are checked.
Heat recovery VRF
Thanks to branch (distribution) boxes and valves, some zones heat while others cool. Branch boxes, valves and mode changes are tested separately.
Water-cooled VRF
A water-source unit is used instead of an outdoor unit; on the water side, the filter, flow and plate heat exchanger fouling are checked.
Mini VRF
Small single-fan outdoor units used in homes and small offices; the maintenance scope is the same, it just takes less time.
Maintenance form: values we measure on site
At every maintenance visit we measure the values below and record them on a per-unit maintenance form. Comparing the form at the next visit helps detect faults early.
| Measurement / check | Unit | Expected |
|---|---|---|
| Outdoor unit suction / discharge pressure | bar | Manufacturer values |
| Superheat | K | Manufacturer values |
| Compressor current | A | Below the nameplate value |
| Supply voltage | V | within ±10% |
| Refrigerant leak test | — | No leaks |
| Fault code history | — | No recurring codes |
| Indoor unit air outlet temperature | °C | Matches mode and setpoint |
| Drain test | — | Draining |
What happens without maintenance?
- The compressor runs at high pressure and temperature, shortening its life
- Some indoor units do not cool or heat
- Drain overflows and ceiling damage
- A small refrigerant leak grows until it stops the system
- Communication and sensor faults are noticed late
Refrigerant leak checks and regulations
Systems containing fluorinated refrigerants, such as chillers and VRF, fall under the Regulation on Fluorinated Greenhouse Gases. According to the Ministry's training documentation, leak checks are carried out every 12 months for equipment containing 5–50 tonnes CO₂ equivalent (every 24 months if a leak detection system is installed), every 6 months for 50–500 tonnes CO₂ equivalent (every 12 months with a system), and every 6 months for 500 tonnes CO₂ equivalent and above; at this size, installing a leak detection system is mandatory. Equipment and inspection records are entered into the EKOMVET system. Checks are performed by services holding a TSE Service Competence Certificate and technicians certified for equipment containing fluorinated greenhouse gases. Source
YOİ Mühendislik holds the TSE Service Competence Certificate; we include leak checks in the maintenance visit and record the results in the report and our logs.
What determines the price of VRF system maintenance?
Since maintenance pricing depends on equipment type and site conditions, we do not offer a fixed price list. During the site survey we clarify the items below and provide an itemized written quote:
- Number of outdoor unit modules and indoor units
- Indoor unit types (cassette, concealed ceiling, wall-mounted)
- Ceiling and roof access
- Refrigerant leak detection and need for top-up
- Replaced sensor, condensate pump or control board
- After-hours work
- One-time maintenance or an annual contract?
The maintenance process in 5 steps
- Request: unit type, quantity and location are sent by phone, WhatsApp or form.
- Site survey and inventory: equipment is inspected on site, and the scope and schedule are defined.
- The written quote and maintenance plan are approved.
- Maintenance: measurements are taken, cleaning and checks are carried out, and approval is requested if parts need replacing.
- Report: unit-by-unit measurements and recommendations are delivered in writing.
Service areas
Our base is in Ankara Etimesgut. We provide VRF system maintenance daily across all districts of Ankara (Çankaya, Yenimahalle, Etimesgut, Sincan, Keçiören, Gölbaşı, Mamak, Altındağ, Pursaklar, Polatlı, Kahramankazan, Elmadağ). We carry out project-based and annual-contract maintenance in all 81 provinces of Türkiye, including İstanbul, İzmir, Bursa, Antalya, Konya, Kayseri, Eskişehir, Kocaeli, Adana, Mersin, Gaziantep, Samsun, Trabzon, Erzurum and Diyarbakır, and we also take part in public institutions' maintenance tenders.
Regional pages: VRF maintenance Ankara · Ankara districts · İstanbul · All cities
Frequently asked questions
How often should VRF system maintenance be done?
Indoor unit filters should be cleaned every 1–3 months depending on usage, and general system maintenance should be done twice a year (at the start of each season).
What is the difference between VRF and VRV?
Technically they are the same system. VRV is Daikin's registered name; other manufacturers use VRF, and some use VRS.
Is the system shut down during VRF maintenance?
Outdoor unit measurements are taken while the system is running. Condenser cleaning and electrical checks require brief shutdowns; indoor units are serviced zone by zone.
Which brands of VRF systems do you maintain?
We service all brands, including Daikin, Mitsubishi Electric, LG, Samsung, Toshiba, Hitachi and Midea.
Is refrigerant leak checking mandatory for VRF systems?
Leak checks at intervals based on the amount of fluorinated refrigerant are required by regulation. Most large VRF systems fall within this scope; we carry out the check together with maintenance and record it.
What should I do if I see a VRF fault code?
Note the code and which unit it appears on, and send it to us. You can look up code meanings by brand on our error codes page; do not reset the unit repeatedly.
What determines the price of VRF maintenance?
It depends on the number of outdoor and indoor units, access, refrigerant top-up and parts replaced. We provide a written quote after the site survey.
Do you provide VRF maintenance outside Ankara?
Yes. We carry out VRF maintenance daily in Ankara and on a project or annual contract basis in other provinces.
Sources
- Republic of Türkiye Ministry of Environment, Urbanization and Climate Change: training presentation on the Fluorinated Greenhouse Gases Regulation (2025)
- Manufacturer maintenance manuals and YOİ Mühendislik field practice