Deck 13: Heating Control Devices

Question 1

The basic control cycle of a gas heating appliance is initiated when a switch, usually a ____________________, closes to call for heat.

Answer 1

thermostat

Question 2

The ____________________ is the heart of an oil burner control system and supervises the operation of the oil burner.

Answer 2

primary control

Question 3

The ____________________ fan switch is nothing more than a thermostat that closes on a rise in temperature to start the fan motor when the furnace can supply warm air to the structure.

Answer 3

temperature-controlled,temperature controlled

Question 4

In a(n) ____________________ heating system, a call for heat completes the heating control circuit, starting a chain reaction that results in lighting a burner.

Question 5

____________________ systems use a spark igniter (direct spark ignition) or a silicon carbide igniter (hot surface ignition) to light the main gas burner directly.

Question 6

Steam is the most popular method of transferring heat from an appliance to a structure.

Question 7

How many contacts can a sequencer have? Do they close in unison?

Question 8

What are the two main types of hot water heating units used to supply heat to a conditioned space?

Question 9

The ____________________ pilot burns only when there is a call for heating and remains off when there is no call for heat.

Question 10

Thermostats that are immersed in water are sometimes called ____________________.

Question 11

What do forced-air electric furnaces use to provide heat to a conditioned area?

Question 12

In the basic warm-air furnace, many controls that are applicable to warm-air furnaces depend on the type of energy that is being used to supply the heat to the structure.

Question 13

In all types of forced-air heating equipment, there must be some method of controlling the fan motor so that the warm air is delivered to the conditioned space at the correct temperature.

Question 14

The intermittent pilot control system must only light the pilot.

Question 15

____________________ on heating appliances are basically thermostats that open when an unsafe condition exists in the furnace, such as high furnace temperatures.

Question 16

There are several types of fan switches used in industry.

Question 17

The basic heating appliance used in the heating and cooling industry usually heats air or water or produces steam.

Question 18

A stack switch is a heat-actuated control that uses the stack temperature to indicate that the oil burner has or has not established a flame.

Question 19

Limit switches are used in case of ____________________, which is flame extending outside the combustion chamber or heat exchanger.

Question 20

How do hydronic heating systems circulate water throughout a structure?