Unit 14

The purpose of a heat anticipator is to ____.

• reduce the temperature swing of a conditioned space
• anticipate a sudden rise in temperature
• keep the thermostat warm
• ensure that the system transformer does not overheat

The difference between system overshoot and system lag is called ____.

• temperature swing
• room temperature
• temperature rise
• room swing

The heater in the thermostat control circuit in the cooling mode is active when the ____.

• cooling contact is open
• cooling contact is closed
• fan switch is open
• fan switch is closed

The heater in the thermostat control circuit in the heating mode is active when the ____.

• cooling contact is closed
• cooling contact is open
• fan switch is open
• fan switch is closed

What is meant by the term "detent"?

• Rapid making and breaking of a contact.
• Slow motion of a contact to ensure good electrical contact.
• The compensation furnished by heaters in the thermostat.
• The control of the blower in the air handler.

The cold anticipator is wired in ____ with the mercury bulb cooling contacts and is energized during the off cycle.

• parallel
• series
• sequence
• opposition

To properly set the heat anticipator, the ____ must determine what the current flow is through the heating control circuit when the furnace is operating in a steady state condition.

• heating technician
• manufacturer
• homeowner
• electrician

Line voltage thermostats have heavier contacts and use which type of sensing element?

• All of the above
• Bimetal
• Bellows
• Remote bulb

To obtain an accurate reading of a fluid in a large pipe, a technician should ____.

• use a permanently mounted thermometer in a well
• strap a dial-type pocket thermometer to the pipe
• use a digital thermometer in a glass of ice water
• Any of the above will work fine.

A low pressure control has a "high event" and a "differential" setting. The technician wants the system to turn on at 28 psig and shut down at 2 psig. What would be the proper settings?

• High event: 28 psig, differential: 26 psig.
• High event: 28 psig, differential: 2 psig.
• High event: 2 psig, differential: 2 psig.
• High event: 2 psig, differential: 28 psig.