Author Question: What does the low-temperature thermostat do? A) When it senses air temperature below 35F, it ... (Read 60 times)

Tirant22 · **on:** Jul 24, 2018

What does the low-temperature thermostat do?

A) When it senses air temperature below 35F, it shuts down the blower.
B) It controls the flow of chilled water through the coil.
C) It controls steam flow through the preheat coil.
D) It starts the system when the temperature outside reaches 35F.

Question 2

What is the purpose of the check valves that are installed in parallel with the metering devices on heat pumps?

A) To allow the technician to check the operation of the metering device without recovering refrigerant
B) To prevent excessive pressure difference across the metering device
C) To direct the flow of refrigerant around the metering device that is not being used
D) To provide a pressure testing port on both sides of the metering device