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HVAC Training

Page : 12 of 42

Title:

Chiller Maintenance

Lesson Plan

NMH30C000105

EO: 1. 1

Discuss lessons learned from selected Operating Experience and CRDRs

associated with performing chiller maintenance activities.

Introduction

The weekly PM is a valuable tool to monitor chiller overall condition and performance. Many of the

corrective maintenance activities are first identified when performing the weekly PM.

In this objective we will discuss lessons learned from selected Operating Experience and CRDRs.

The students are encouraged to provide any additional details if known.

Main Idea

This is a good opportunity to discuss any issues that occur when performing the weekly PM and

CM activities on the chillers. Class participation is encouraged.

A prerequisite to the w eekly chiller PM task is to record the last entries for refrigerant level and oil

inventory on the logs. Attention to detail transferring data, oil and refrigerant levels transferred

from week to week have had some errors in the past which have resulted in a chiller becoming in-

op.

CRDR # 2707508 Documents the occurrence of high oil level on Normal Chiller 2MWCNE02.

The description of the event:

In Unit 2 on 5/9/04, Normal Chiller WCN-E02 was noted to be running at its upper amp limit

(47amps). The chiller was secured, and HVAC responded to investigate. About 5 gallons of excess

oil was removed from the chiller oil sump to bring the oil into the upper site glass. This action was

taken under the w eekly chiller PMWO. The chiller was placed back in service and the amps were

significantly reduced (30 amps).

Details of the event:

The technician drained oil from the chiller sump because he could not see an oil level in the site

glass. Once the oil level was visible in the upper site glass, the chiller amps and the oil sump

temperature returned to normal. No other problems were noted concerning the operation of the

Unit 2 E02 chiller. Five gallons of oil was removed from the oil sump, leaving a total oil volume

accounting in the chiller at 8 gallons.

The oil volume data for chiller 2MWCNE02 in IPDAS was reviewed to identify any abnormal trends.

Oil volume data back to January 2000 was reviewed. The total oil volume in this chiller varied

slightly during the years. There was no indication that the chiller was using excess oil in the recent

past.

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Carrier 19FA Betriebsanleitung Seite 12