When any Group 1 refrigerant, except CO2, is removed from a refrigerating system how shall it be discharged?

• to the atmosphere at an approved location

• from the high pressure side of the refrigerating system to the low pressure side

• into an approved shipping container

• into an empty disposable container

A zero energy consuming device could be one of the following:

• Pneumatic solenoid

• A thermocouple

• Mechanical relay

• Solid state (electromechanical) controller

Where a closet is designed for the installation of a clothes dryer, an opening having an area of not less than ___ for makeup air shall be provided in the closet enclosure.

• 40 square inches

• 65 square inches

• 80 square inches

• 100 square inches

The _____ thermostat wire is the one approved to pass through air ducts.

• smoke-rated

• fire-rated

• plenum-rated

• shock-rated

The minimum dimension of a horizontal duct that is used to introduce combustion air into a confined space must NOT be less than

• 1 inch
• 2 inches
• 3 inches
• 5 inches

Give details on how a natural gas piping tracer must be installed. It must:

• have the radius of bends not less than 20 times the inside diameter.
• have the pipe joints threaded and screwed together
• include a minimum 18 AWG insulated copper tracer
• be laid on a bed of pea gravel

Enthalpy is the

• total heat of a substance.
• total latent heat of a substance.
• total sensible heat of a substance.
• measured temperature difference of two substances.

Make-up air shall be supplied to each room with an exhaust system. How shall the amount of the make-up air compare to the amount of air exhausted?

• it shall be doubled
• it shall be 1 1/2 times
• it shall be equal to it
• it shall be 1/2 of it

Increasing the superheat tends to ___ the evaporator.

• disable
• flood
• starve
• cool

The best alternative to connect Chlorinated Poly Vinyl Chloride (CPVC) pipe joints in a hydronic heating system is by ___.

• heat-fused fittings
• solvent cement
• brazing
• welding