HVAC Code Compliance 3

Question 1

The EPA Section 608 regulations require that technicians recover refrigerant to what minimum level before opening a system with an appliance containing more than 200 lbs of refrigerant?

Accepted Answer

10 inches Hg vacuum

Answer

EPA 608 regulations require recovery to 10 inches Hg vacuum for systems containing 200 lbs or more of refrigerant manufactured before November 15, 1993, and higher recovery for others.

Question 2

According to ASHRAE 15, a machinery room containing a refrigeration system must have what type of detector installed?

Accepted Answer

Refrigerant vapor detector

Answer

ASHRAE 15 requires a refrigerant vapor detector in machinery rooms that activates an alarm and ventilation system when refrigerant concentration exceeds safe levels.

Question 3

Per the International Residential Code, what is the minimum headroom required in a space containing mechanical equipment such as a furnace or air handler?

Accepted Answer

6 feet 6 inches

Answer

The IRC requires a minimum 30-inch-wide clear pathway with 6 feet 6 inches of headroom to access mechanical equipment in attics, crawlspaces, and utility areas.

Question 4

Which listing organization's approval is typically required on HVAC equipment for code compliance in US jurisdictions?

Accepted Answer

A Nationally Recognized Testing Laboratory (NRTL)

Answer

Mechanical codes require HVAC equipment to be listed and labeled by a Nationally Recognized Testing Laboratory such as UL, ETL, or CSA.

Question 5

Under NFPA 70E electrical safety standards relevant to HVAC, what is the minimum approach boundary for unqualified persons near exposed energized parts at 120V?

Accepted Answer

Limited approach boundary

Answer

NFPA 70E defines the Limited Approach Boundary as the distance unqualified persons must stay from exposed energized conductors to avoid electrical shock hazard.

HVAC Practice Test

HVAC Practice Test

HVAC Code Compliance 3