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HVAC Training

Page : 27 of 42

Title:

Chiller Maintenance

Lesson Plan

NMH30C000105

EO: 1. 2

Discuss the sequence of work to coordinate chiller maintenance activities.

Introduction

In this lesson the trainee will discuss various maintenance activities on the Carrier 19FA

Chiller.These tasks are performed during the outage where coordination of the work activities is

critical.

Lessons learned form OE15289 - Freon Sprayed out of Chiller Valve due to Delay in Executing

Work will also be discussed.

Main Idea

1) The sequence of work activities should be determined prior to starting the job. This will ensure the most

efficient use of the scheduled time. The method of restoration of the refrigerant transfer into the machine will

be determined during the Pre-job briefing. Areas that should be addressed in the briefing should include but

not be limited to:

a) Leak check the chiller, refrigerant

i) Leak check the chiller prior to transfer of refrigerant into storage tank.

ii) Pump down requirements will be determined by the work scope.

b) Heater calculation may be done on the front end or completed after oil change out.

c) Calibrate non-pressure boundary controls while moving refrigerant.

d) Simultaneous work activities are performed to save time and should not distract you from protecting the

machine from freezing.

e) Trending Refrigerant Levels

f) Testing Methods

g) EPA Requirements for Scheduled Repairs.

i) EPA requires pull down to four inches of mercury for our chillers.

ii) If we have a large leak the requirement is then 0 PSIG.

iii) If we are only changing oil, then oil may be removed at 2 – 5 PSIG.

i v) If we are doing major work, i.e. bearing inspections, retrofitting, or any large component opening we

will pull down to 22” and then re-charge with nitrogen, which would require evacuation before re-

charging with refrigerant.

h) There have been problems in the past with a lack of communication between shifts about:

i) when we were going to open the machine

ii) if the machine had been back filled with nitrogen

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Carrier 19FA Betriebsanleitung Seite 27