Carrier 19FA Instrukcje Operacyjne Pobierz pdf (Strona 30)

HVAC Training

Page : 30 of 42

Title:

Chiller Maintenance

Lesson Plan

NMH30C000105

EO: 1. 3

Discuss the process of control panel and field wiring inspection.

Introduction

In this objective the trainee will learn what to look for when inspecting the chiller control panel and

field wiring.

Main Idea

Perform a Two Minute Drill:

What are the task conditions?

1) Assess and address work place hazards.

2) Verify that the chiller control panel is de-energized.

3) Check field terminations and main control panel terminations for looseness, discolored or cracked insulation, and

evidence of corrosion.

a) Control Panel Inspection:

i) Terminal board screws and hardware

ii) Relay terminations

iii) Fuse connections

i v) Temperature module terminations

v) Timer terminations

vi ) General condition of wire in raceways

b) Field Termination Inspection:

i) Sensor terminations

ii) Termination block hardware

Lessons Learned example:

On 04/26/1999

Faston connections for the 120v power to the program timer on the Essential chiller was found to

be cracked approximately 1/3 of the way across the throat of the connector. CRDR# 2-9-0094 w as

written to address this issue.

HVAC Technicians should always be on the look out for connectors that may be cracked.

Take care not to bend connectors while performing work in the control panel.

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Carrier 19FA Instrukcje Operacyjne Strona 30