Course: HET 230 - Spring 2015

Unit 6 Lab Assignment

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Unit 6 Lab Assignment

Upon completion, using basic hand tools, amp probe, volt meter, tachometer, and calculator, you will be able to remove multi groove drive, align sheaves and measure the consequences of your actions. Practice good safety habits.  An air conditioning and refrigeration technician is exposed to many hazards.  It is essential that he/she constantly be aware of these hazards and to develop good safety habits to minimize unsafe situations.

Finding an Air Handling Unit or Drive a Driven Trainer, preform the following tasks:

1. Before sheave removal measure: Motor speed, Fan Speed, motor current, cfm. Remove drive sheave. What type of locking device is used?

1-a. Calculate BHP

1. Assemble new drive sheave onto fan motor. What did you use to align the sheaves?

2-a. What would the consequences be of a misaligned sheave?

2-b. What would the consequences be of an over tensioned belt?

2-c. What would the consequences be of an over tensioned belt?

1. With new sheave in place calculate: (show calculations)

New motor RPM:

New fan RPM:

New motor Current:

BHP

New belt size

1. With new sheave in place measure: (were your calculations correct?)

Motor RPM:

Fan RPM:

Motor Current:

1. Adjust drive sheave inward.

5-a. Consequences to:

Motor RPM

Fan RPM

Motor Current

Air Flow

Drive Belt

5-b. Calculate new:

New motor RPM:

New fan RPM:

New motor Current:

BHP

CFM

1. Adjust drive sheave outward

6-a. Consequences to:

Motor RPM

Fan RPM

Motor Current

Air Flow

Drive Belt

1. Describe your conclusions to this exercise.

Click on the file below to download the Lab Assignment
- HET 230 Week 6 Lab_Drive Sheave Calculations.doc (31.74 KB)