Ch. 19
The type of compressor where the motor and pump are not in the same housing.
what is open-drive?
The compressor protection device that is intended to protect a compressor from overheating.
what is a thermal overload?
The primary purpose of a metering device.
what is to cause a pressure drop?
The primary purpose of an evaporator.
What is to absorb heat?
The most commonly seen metering device.
what is a TXV?
A thin strip of steel that bends to open a valve passage way and bends back straight to close the passage.
what is a Reed valve?
Substances required for all mechanical compressors.
what is clean oil and liquid-free, vapor refrigerant?
A type of metering device that can change its orifice size.
what is modular?
Heat exchange that occurs without the use of a fan to circulate the air.
what is natural draft?
Two ways a compressor might fail.
what is mechanically or electrically?
The volume of space between the top of the piston and the valve plate when the piston is at top dead center.
what is clearance space?
The compressor protection device that protects from liquid slugging
what is an accumulator?
Three factors that determine pressure drop with a capillary tube metering device.
what is length, inside diameter, and number of turns.
Heat exchangers made from two metal sheets that are welded together to form a series of passages.
what is plate exchangers?
Utilizes heat rejected from a system to provide heat to some alternate source within a building or home?
what is heat recovery?
The five styles of compressors.
what is reciprocating, rotary, scroll, screw, and centrifugal?
Name at least three oil control devices.
what is oil separator, reservoir, level regulator, or safety control?
The device that receives the temperature and pressure signals, uses them to calculate the proper valve response, and then sends commands to the stepper motor.
what is an eev's control module (controller)?
A solution that changes the boiling/freezing point of water.
what is a brine?
The conditions within a system when a metering device is clogged (over restricting).
what is low suction pressure, ok to high liquid pressure, high superheat and ok to high subcool?
The location of an unloader on a reciprocating compressor.
what is with the intake (suction) valve?
The reason for a time delay in a oil safety control.
what is to help prevent nuisance shut downs due to irregular readings that may occur during start up?
Adsorption occurs when.
what is when a layer of gas or liquid adheres over the surface of a solid substance?
3 different types of defrosting methods for low-temperature evaporators.
what is, hot-gas defrost, reverse hot-gas defrost, pressure regulating valves, fan speed controls, electric heat water spray systems?
what is ask great questions?