OR HVAC Contractor case studies

OR HVAC Contractor · Put your knowledge to work in context.

The Oregon HVAC Contractor credential is a state-issued authorization for a business to advertise, bid, and perform heating, ventilating, air conditioning, and refrigeration work in Oregon. It is aimed at owners and qualifying individuals of HVAC/R businesses rather than at technicians seeking a trade certificate, so it blends trade knowledge with business and code responsibility. The OR HVAC Contractor case studies are 5 cases and about 4,157 words.

The One-Page Proposal: Contract Deficiencies, CCB Complaint, and a Cash Helper

You hold a CCB residential specialty (HVAC) license. In April a homeowner accepted your one-page proposal, printed on your letterhead, to replace a 1995 gas furnace and add a 3-ton heat pump.

817 words, about 4 min 2

Iced Coil, Low Airflow, and Three Extra Pounds of R-410A

Your company takes over maintenance on a 2,600 ft² single-story house built in 2004. The owner says the 3-ton R-410A heat pump "runs all day" and the indoor coil iced over twice in July.

850 words, about 4 min 3

A 55-Pound Freezer Charge and a 29-Pound Top-Off Habit

A neighborhood market's walk-in freezer uses a remote air-cooled condensing unit with a nameplate charge of 55 lb of R-404A. The owner's maintenance log shows 12 lb added in February, 9 lb in June, and 8 lb in October - 29 lb in 12 months - and each visit was a top-off with no leak search.

833 words, about 4 min 4

Heat Pump Changeout: Ampacity, Disconnect Location, and a Long Thermostat Run

You are wiring a new 3-ton R-410A heat pump condenser on a residential remodel in Oregon. The nameplate reads RLA 14.2 A, LRA 79 A, Minimum Circuit Ampacity 20.0 A, Maximum Fuse or HACR Breaker 30 A.

805 words, about 4 min 5

Furnace in a 72-Cubic-Foot Closet: Combustion Air, Venting, and a Marginal Gas Line

You are replacing a 100,000 Btu/h natural gas furnace in a 1993 house. The furnace sits in a closet 3 ft × 3 ft × 8 ft - 72 ft³ - with a solid door and no outside-air duct.

852 words, about 4 min