Daikin VRV
Remote Service
Case Study


Daikin VRV 3-Pipe Heat Recovery system with a
multi–Branch Selector Box for each apartment.

The system was installed and commissioned 2 years ago.

Customer challenge

The Resident of an apartment has opened an urgent service ticket advising the Living Room and Bedroom units were not heating properly. Also, sometimes it felt like they were cooling while calling for heat.

The Traditional Course of Action
Schedule a site visit
Travel to site
Connect a service tool, and collect a current, limited operational data
Analyze the collected data
Find the fault and fix it
Collect new data and verify the fix
Remote Service course of Action

As the site was connected to the CoolAutomation Remote HVAC Service Solution, the HVAC engineer activated an anomaly test operation. Following several deep remote operation tests, the Service Solution suggested that it is likely that there is cross-communication wiring between different ports on the Branch Selector Box. As a result, while switching ON the Living Room indoor unit, the refrigerant was flowing to another indoor unit.

As an immediate temporary solution to allow the residents to have heat, the engineer suggested that the two crossed units should be operated simultaneously until the engineer visits on the next day.

An engineer then traveled to the site and corrected the fault.

Engineer time on site for fault correction: 45 minutes.

Access the system remotely from the comfort of the office to test the system and find fault.
Send a Junior VRF Engineer for 1 hour On-Site to perform the fix.
Verify the fix remotely.


Traditional HVAC Service
Remote HVAC Service
On-site long data recording with the essential need for the error to re-emerge (will not appear if both units are operating)
Offsite remote system test and fault finding
Multiple trips to the site are expected
Less than 1 hour of On-Site Junior VRF Engineer
Analysis of the raw data gathered with minimal assistance from the tool, involving a Senior VRF expert on-site for a considerable amount of time
Remote fix verification
On-site fix
On-Site verification test


Minimal customer disturbance
Only one trip, versus multiple trips
Simplified data analysis

Compatible systems

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