Category : Chiller Technology
We recently carried out air cooled screw chiller maintenance at a site we look after in the North West. The plant is described such because it uses two Bitzer screw compressors to create a pressure difference in the R134a refrigerant. The plant has been designed to be remotely operated…
This is a way of operating the chiller remotely. Instead of the end user having to walk up to the machine each day to check for faults (chiller local) the plant can be remotely operated and monitored.
The run signal to start the chiller is sent by a relay being energised in the BMS panel (Building Management System) in the plant room. When the chiller receives the run signal, it shows the chiller on message.
When the chiller develops a fault, the chiller energises a relay, sending a fault feedback signal to the BMS panel. This fault signal causes the run signal to drop out and a new run signal to be sent to the adjacent redundant system.
The BMS panel runs contactors which bring the water system pumps on, it also receives analogue signals from temperature sensors on the water system. These inputs and outputs are wired into a PCB which converts them into a data signal. This signal is sent down a CAT 5 plug cable to the supervisor in the facilities management room in the building below.
Remote Monitoring During Air Cooled Screw Chiller Maintenance
A supervisor is a computer which has graphic monitoring of the chillers and the air handlers. The supervisor, is connected down a phone line to the BMS company. Often, the chiller is remotely operated and monitored from a laptop used by a BMS engineer working from home.
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Air Cooled Screw Chiller Maintenance Parts
With a comprehensive range of chiller parts available, off the shelf, for air cooled chillers- look no further than Maximus Chillers for all your chiller parts. We can also supply parts mostly same day. A specialist part on this chiller is the electronic expansion valve driver- this regulates the steps in the expansion valve to ensure correct superheat in the shell and tube evaporator. An electronic expansion valve driver is also available to regulate the expansion valve in the refrigerant economiser. This acts to subcool the refrigerant to ensure optimum system efficiency.
Diagnosis During Air Cooled Screw Chiller Maintenance
Should you need chiller diagnosis- one of our trained professionals onsite during the maintenance will identify the issue with his system test equipment.
To read more about air cooled chiller maintenance click the Tag at the top of the page.
Air Cooled Chiller Planned Maintenance
Read more about remote monitoring and control on Wikipedia | Click Here