Carrier 19FA Manual do Utilizador descarregar pdf (Página 12)

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Title: Chiller High Voltage Motor Terminations Lesson Plan #: NMH30L050303

EO 1.1.3 Discuss the repair process for the compressor motor leads.

1.1.3.1 Introduction

In this objective the trainee will discuss the procedure for repairing the motor leads on 19FA Carrier Centrifugal

Chillers.

1.1.3.2 Main Idea

1) Compressor motor lead repair on 19FA Carrier Centrifugal Chillers.

a) Disassemble terminal.

b) Slip new terminal over leads and thread terminals into plate (not tightly - they will be removed later).

c) Mark the motor lead even with the end of the terminal. Refer to page 2 of VTM-C150-0031.

d) Remove the terminal and plate.

e) Measure 1½ inches back from the mark and cut the cable. (Cutting may not be required if this is a new cable )

f) Skin 1 inch from the cable end.

g) Hold the adapter in tongs with pigtail down. Apply flux to inside adopter. Heat adapter until flux bubbles. Fill

hole in adapter with 50-50 Tin - Lead solder.

h) Slip adapter onto cable end and hold until solder sets. Additional solder may be applied to fill gaps.

Note 1: Care must be taken so that cable and adapter remain concentric and in a straight line. If not, later assembly

will be difficult.

Note 2: Cable insulation may bubble and turn black. This is normal and will be trimmed later.

i) When cable-adapter assembly has cooled, clean excess solder from adapter, especially at the threads and at

the sealing surface near where the bushing comes in contact.

j) Taper insulation from cable end and remove black carbonization. Clean cable and adapter. Any foreign matter

will degrade the insulation to be applied.

k) Paint area around cable-adapter joint with epoxy.

l) Apply glass tape (with clean hands) in layers until joint is well insulated as shown in sketch below (note

maximum diameter)'.

i) Coat each successive layer of tape with epoxy. Avoid creating voids.

ii) Apply tape with some tension to insure good bonding with copper and with cable insulation. Allow

insulated joint to cure.

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Carrier 19FA Manual do Utilizador Página 12