Tenways Climate Control Solutions
CoolAutomation’s UK distributors
Site: A high-end London residential apartment served by a regional HVAC service provider.
Solution: Predictive Maintenance Suite
HVAC System: Daikin VRV
Diagnosing Faulty Compressors
Daikin VRV HVAC
The Customer
Customer Challenge
A Daikin VRV heat recovery system performed in a satisfactory manner for the first two years of its operation . After 2 years, in what is a relatively rare occurrence, both of the system’s inverter compressors became faulty.
The customer decided to change his HVAC service company, and the new company was tasked with replacing the compressors. The new compressors were installed and activated, but the root cause of the malfunction remained unknown.
The Traditional Course of Action
1
Schedule a site visit
2
Travel to site
3
Connect a service tool and collect current, limited operational data
4
Analyze the collected data to diagnose the issue
5
Return to the site with the required parts and tools to apply a fix
6
Arrive onsite for a third visit to collect new data and verify the problem has been resolved
The Remote Service Course Of Action
The service team performed a checkup using CoolAutomation’s Predictive Maintenance Suite, which revealed irregular readings.
When both inverter compressor units were heating, they were working just fine. However, when one unit was in heat mode and the other was off, the unit in heat mode was actually cooling.
After analyzing the service data remotely, a VRF expert suggested swapping the control lines between the two units.
A team of junior technicians was sent to the site. Upon arrival, they opened the ceiling and, indeed, found that the control lines were swapped.
After fixing the issue, the team used the Predictive Maintenance Suite again to verify that the fix was successful. They repeated the operational sequence and saw that both units were now operating correctly.
And so, the root cause was identified: the control swap was determined to be the primary factor behind the compressors’ malfunction, possibly causing liquid refrigerant to enter the suction pipe.
Remote Service Course Of Action Breakdown
1
Remote diagnostics
Remotely access the system from the comfort of the office to test the system and find the fault
2
Less than 1 hour of on-site junior VRF technician time
Send a junior VRF engineer for 1 hour on-site to perform the fix
3
Remote fix verification
Verify the fix remotely
Traditional HVAC Service Vs Remote
| Traditional HVAC Service | Remote HVAC Service |
|---|---|
Extended on-site time waiting for the error to re-emerge (which will not happen when both units are turned on) | Offsite remote system test and fault detection |
Multiple trips to the site are expected | Less than 1 hour of junior VRF technician time on-site |
Analysis of the raw data gathered from involving a senior VRF expert on-site for a considerable amount of time | Remote fix verification |
On-site fix | |
On-site verification test |
Benefits
Minimal customer disturbance
One onsite visit versus multiple visits
Simplified data analysis
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