HVAC FC 02

When may a replacement listed forced air furnace be installed in an existing closet which is less than 12 inches wider than the furnace and with a minimum clear working space not less than 3 inches along sides, back and top of the furnace?

• when approved by the authority having jurisdiction
• when such width is in compliance with the manufacturer"s specifications
• when approved by the owner
• when the installing contractor assumes full responsibility

Piping shall be supported at distances not exceeding the spacing specified in the International Mechanical Code. The maximum interval spacing requirement for a 3/4-inch copper-alloy tubing condensate drain line, installed horizontally shall be:

• 20 feet
• 15 feet
• 10 feet
• 6 feet

Some old large oil-filled capacitors (found in fluorescent lamp ballasts, and other applications) can leak and create a safety hazard. This dielectric fluid contains what type of material?

• Class C
• Carbon Dioxide
• Carbon Monoxide
• PCBs

A typical psychrometric chart graphs relative humidity in percent, dry bulb and wet bulb temperatures. The dry bulb temperatures shown at the bottom of the chart range from ___.

• 0 degrees F to 100 degrees F
• 10 degrees F to 103 degrees F
• 20 degrees F to 107 degrees F
• 30 degrees F to 170 degrees F

Constants for heat loads are defined in the text Modern Refrigeration and Air Conditioning for a 4 inch thick concrete slab with no finish as

• U=0.45; R=1.34
• U=0.55; R=1.44
• U=0.65; R=1.54
• U=0.75; R=1.64

What is the minimum wall thickness for a 1 1/2 inch nominal carbon steel pipe with threaded couplings used to transport liquid Group A1 refrigerant?

• Schedule 20
• Schedule 40
• Schedule 80
• Schedule 120

A confined space in which a natural gas appliance has a clearance of 1 inch on the sides and back, and 6 inches on the front requires to have a MINIMUM of ____ permanent ventilation openings communicating with outside air.

• two
• four
• one
• three

If the compressor is exposed to cold temperatures, like an air-cooled roof unit, a good operating practice would be to use a ___ circuit during the off cycle to assist with equipment start-up.

• crankcase heater
• low pressure
• high pressure
• pressure pump

As a general rule, how many cfm of fresh air per person should be provided to replace oxygen consumption?

• 10 cfm
• 15 cfm
• 20 cfm
• 25 cfm

A portable refrigerant container shall not be connected to any refrigerating system longer than

• Necessary to charge or discharge the system
• 12 hours
• 24 hours
• 48 hoiurs