Carrier 19FA Provozní pokyny stáhnout pdf (Strana 18)

HVAC Training

Page : 18 of 42

Title:

Chiller Maintenance

Lesson Plan

NMH30C000105

On October 23, 2006, the Essential Chiller 2MECBE01 tripped on low oil pressure. Operations

generated work order 2934841 to troubleshoot and rework.

On October 23, HVAC performed troubleshooting. Initial problem indication was possibly a loose

connector but after tightening the connection and running the pump; the amp draw was too

high. The decision was made to replace the oil pump.

The oil pump was replaced on October 24 and the chiller was run again. Amp draw was still

high. Further checking revealed a high Differential Pressure [DP] across the filters. When the

filter canister was removed they found the upper felt gasket was half wedged in the filter housing

discharge line. The old filters and gaskets were replaced with new filters and gaskets. The

chiller was re-run and acceptable amp draw reading were obtained.

Evaluation of the removed filter revealed a depression on the upper filter. This depression was

determined to have been caused by the discharge line tube; the upper filter was misaligned to

the discharge line during assembly allowing the gasket to be slowly extruded from its installed

location and enter the discharge line; restricting oil flow.

Filter and gaskets were replaced by WO 2934841. Chiller was returned to service with no further

problems.

What could cause the refrigerant level to be out of spec and what actions are required?

CRDR #2711310 documents an occurrence when the refrigerant level was less than the

minimum operability level.

Description of event:

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Carrier 19FA Provozní pokyny Strana 18