Emaar Najd Est.

29/07/2019

25/07/2019

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24/07/2019

Common Chiller Troubleshooting Problems

Following are some common problems that you can troubleshoot, based on the readings from your gauges and probes:

A. Low pressure trip — Caused by low refrigerant, power assembly broken capillary; low or no water flow; clogged water filter or screen; antifreeze or mud coating the tubes of the evaporator causing poor efficiency.

B. High pressure trip — The water-cooled condenser has poor or no flow; water-cooled condenser has mineral buildup due to poor water quality (very common); air-cooled condenser is blocked with debris or has a fan not working; chilled water tank temperature is very high (over 80 F plus).

C. Oil failure trip — Can be caused by either low superheat, low oil (due to a refrigerant leak), or oil pump damage.

D. Freezestat — Poor water flow, or the thermostat is set too low.

E. Blown fuses or starter trips — Shorted or over-amped motor, compressor or wires. Make sure to check for grounds or shorts before you try again.

F. System running but not reaching thermostat setpoint — Evaporator internally iced up, antifreeze breakdown causing poor heat exchange, system load is too great for chiller to handle.

G. Proof of flow — either flow or pressure switches in water circuit are suffering from low or no flow, blocked water filter, water valve shut off, water piping too small, flow switch paddle broken (very common).

Keep in mind that these are common, but certainly not all the problems that can cause a chiller to go offline. It’s always best to remain up-to-date on chiller technology through training. All the major chiller manufacturers offer troubleshooting schools and seminars. All commercial field service technicians should avail themselves of them.

18/07/2019

Predictive Maintenance (PdM) is the scientific analysis of how long an asset will last using one or many types of measurement.

18/07/2019

What is preventive maintenance (PM)?
Preventive maintenance (or preventative maintenance) is maintenance that is regularly performed on a piece of equipment to lessen the likelihood of it failing. It is performed while the equipment is still working so that it does not break down unexpectedly. In terms of the complexity of this maintenance strategy, it falls between reactive (or run-to-failure) maintenance and predictive maintenance.

14/07/2019

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14/07/2019