Nate Installation Guidelines (Chapter 5) Exam Questions and Complete Solutions Graded A+.

_______ registers accomplishes the mixing of the air, the _______grille does not. A. Supply, Return B. Return, Supply C. Dampers, Supply D. Dampers, Return - Answer: A. Supply, Return On New construction projects, the indoor section should be in the _____ mode during the finishing phases of construction. A. In Cooling B. In Heating C. Fan Only D. Off - Answer: D. Off The low return air temperatures can lead to the formation of condensate. Condensate in the presence of chlorides and fluorides form paint, varnish, stains, adhesives, cleaning compounds, and cements creates a corrosive condition. To reduce the sound transmission of the indoor unit in a closet, alcove or utility room you should _____ A. Insulate the return B. raise the blower speed. C. Use isolators. D. Lower the blower speed. - Answer: C. Use isolators. Isolation pads absorb the vibrations caused by the blower motor or by refrigerant being pumped through the connection tubing A package unit installed at ground level must be installed on a slab that has a surface at least 3 1/2 in. above ground level to minimize noise transmission. A. True B. False - Answer: A. True the slab should not be in contact with the structure to minimize noise transmission _____ are used for packaged unit installed on a roof to reduce sounds transmission and prevents water leaks. A. Silicone B. Curb gaskets C. Flashing D. Roof Tar - Answer: B. Curb gaskets Flexible ductwork connectors also my be needed to isolate noises generated by an operation rooftop unit. What is the minimum lift required in a residential application? A. 2 in. B. 3 in. C. 4 in. D. 5 in. - Answer: A. 2 in Some residential application require more then 2 in. of lift. ALWAYS consult the installation guide when choosing or fabrication a trap What is the minimum lift required in a commercial applications? A. 2 in. B. 5 in. C. 2x the static capability of the blower. D. 5x the static capability of the blower. - Answer: C. 2x the static capability of the blower. this is to ensure adequate trapping of the condensate water. Diameter used for condensate drain in residential applications must not be smaller than ____ in. Diameter A. 1 B. 1/2 C. 1/4 D. 3/4 - Answer: D. 3/4 in. Diameter In no case smaller than the fitting size used on the evaporator coil condensate drain. Using smaller-diameter pipe increases the probability that improper drainage will occur. To ensure proper drainage, the pipe should be sloped at the rate of?