Chapter 8, Problem 23RQ

A disadvantage of a central forced-air electric furnace is that A. there is no zone control for individual rooms. B. a thermostat must be installed in each room. C. only line-voltage thermostats can be used. D. it is difficult to add air-conditioning (cooling)

True or False: Some absorption machines are directly fired with gas or oil.

What type of equipment normally has the refrigerantcharge printed on the nameplate?

when must a thermostat be fully opened?

This type of compressor is commonly used in air conditioning systems in large buildings. b) screw a) centrifugal c) hermetic How to install the bulb of the thermostatic valve to the suction pipe. b) vertical c) diagonal a) horizontal

Which of the following components is NOT a type of ventilation system? Select one: a. Airconditioning Units b. Venting Skylight c. Boilers d. Exhaust Fans

On which of the following laws of nature is the air conditioning system based? Heat flow Heat absorption Pressure and boiling points All of the above

While discussing the operation of air-conditioning systems: Technician A says that in order for the refrigerant to release heat, it must be at a low temperature and pressure. Technician B says that in order for the refrigerant to absorb heat, it must be at a high temperature and pressure. Who is correct? Technician A Technician B Both A and B Neither A nor B

Three common controls used in central electric heat applications are thermostats, contactors (or relays), and A. capacitors. B. sequencers. C. cool anticipators.