Working with MTM, following a review of the in-service fault information, it was determined that data loggers should be installed on selected trains. The data collection period was over a single summer season and directly prior to the fleet’s scheduled overhaul.
The successful project allowed MTM and Noske Rail* to accurately understand the true nature of the issues affecting the fleet. Noske Rail’s technical expertise determined the major findings, including:
- Out of temperature faults (No Fault Found)
- Units were not operating in cooling (relay failure external to HVAC) or running at reduced capacity without faulting.
- Low supply airflow
- Reduced cooling performance because of low airflow from undersized and dirty filters
- Pressure fault
- Poor design of a combined HP and LP switch meant pressure trips couldn’t distinguish whether the cause was high or low pressure. Data logging identified the root cause as not HP but an LP fault, even on a hot day.
- Compressor reliability
- Data logging identified that the compressor was subject to conditions of low airflow and poor pressure management causing its failure.
The invaluable information from the data loggers assured diagnosis and helped detail a successful overhaul scope. In short, data logging improves overhaul accuracy.
Accurate information for servicing has helped reduce in-service failures and servicing costs. Contact us today to discuss how data logging might assist with your overhauls.
*This project was completed by Coachair rail, who combined with Noske Rail in 2022, bringing together two great rail HVAC companies under one brand.
