Week #6

WEEK #6 TOPICS

Homework

Practice exams Type III A-1 & Core A-2 (30 minutes).

Review notes relating to continuity, voltage, and thermostat wiring.

Review ⁄ Quiz

EPA 608 Type III A-1 practice exam (30 minutes) and in-class review
EPA 608 Core A-2 practice exam (30 minutes) and in-class review
Specific gravity
Determine the maximum weight of the recovery cylinder that we will use for lab assignments.
Which of the following is or are measured with the system running? a) voltage b) current ⁄ amps c) resistance
Using your meter, you measure 24 vac with the leads on both terminals of a switch. Is the switch open or closed?

Administration ⁄ Announcements ⁄ Observations⁄Questions

Distribute test leads and general purpose towels

Lectures

Refrigerant Safety Data Sheet

A⁄C condensing unit schematic & schematic symbols (See Additional Resources & EPA binder)

The health risks associated with various CO (carbon monoxide) levels

Determining if a switch is open or closed using a voltmeter.

Using resistance⁄continuity, voltage, and amp draws to check HVAC appliances.

How to check a heat exchanger & Testo corporation handout.

Hands on Introduction to air handler blower motors

Lab Work Scheduled for this Week and Beyond:

Reading an A⁄C condensing unit schematic
Using your meter, prove that the high limit switch within your assigned non-running furnace is good. Remember to check using your “finger” tester before testing. Do the same for at least one roll out switch. ** See instructor first! ** Turn on the furnace. Using your meter verify the state of a rollout switch. Is it open or closed? How can you tell?
** See the instructor first! ** Using an alligator lead (supplied by your instructor), turn on the fan without using the thermostat. Afterward, turn on the heat circuit without using the thermostat. Describe why this works. How can you use this technique out in the field?
Recover, pressure test, evacuate and recharge an EPA Type I appliance (textbook pages 168+).
Removing and reinstalling a blower motor.
What's wrong with this furnace? - Part I