CH 10 Equipment and Instruments for Refrigerant Handling and Service

Before repairing a leak, all of the refrigerant in a system must be ___________.

Recovered

A refrigerantion system should be __________ before a brazed on piercing valve is installed.

Recovered and evacuated

Removing a refrigerant from a system and storing it in an external container, regardless of the condition of the refrigerant, defines _______ a refrigerant.

Recovering

Cleaning a refrigerant for reuse by oil separation and single or multiple passes through filter-driers defines __________ a refrigerant.

Recycling

The device that engages an extra spring in a pressure gauge to adjust the gauges calibration to higher graduation marks on its scale is a ________.

Retarder

An externally threaded valve with a spring-loaded center pin is called a __________.

Schrader Valve

Large refrigerant cylinders called ___________ cylinders are often positioned upside-down with their valves at the bottom.

Storage Cylinders

At a service shop, a refillable service cylinder would be topped off using a ________ cylinder.

Storage cylinder

Areas where leaks are likely to occur include all of the following except __________.

Straight runs of tubing

Which of the following service valves is located on the low side of a refrigeration system?

Suction Service Valve

True or False? Electronic leak detectors may falsely indicate a leak if they are used around urethane insulation.

True

Detects the sound of refrigerant escaping under pressure.

Ultrasonic Detector

The leak detection method that detects the sound of vapor escaping from a pressurized system is the ________ method.

Ultrasonic Detector

When charging as much liquid refrigerant as possible into a system from a disposable cylinder, the cylinder should be placed ____________.

Upside down

A pressure gauge that is specifically designed to measure lower-than-atmosphere pressure is a __________.

Vacuum Gauge

A device used for creating vacuum to dehydrate an HVACR system is a ___________.

Vacuum Pump

Wha acts as a fluid seal between air, gases, and contaminants entering a vacuum pump from the refrigeration system?

Vacuum pump oil

To evacuate a system more quickly through an access port, remove the ________ from a Schrader valve.

Valve core

Which of the following measurements is the equivalent of atmospheric pressure at sea level?

29.92in. Hg

5- to 100-ton medium systems

3-5 cfm

Cylinders that contain a corrosive refrigerant must be inspected every __________ years.

5 years

Most manufacturers recommend pulling a vacuum pressure of _________ prior to recharging a system.

500 microns

Recovery/recycling machines must be certified to comply with AHRI Standard _____________.

740

True or False? A compound gauge is intended to be used primarily on the high side of a system.

False

True or False? Gauges used at locations of high elevations should be calibrated to 0 psig at sea level.

False

The purpose of oil in a vacuum pump is to act as a lubricant for the pump and also as a(an)_________

Fluid seal between air,gases, and contaminants entering the pump

Requires an ultraviolet light to scan for leaks.

Fluorescent Dye

The leak detection method that used an ultraviolet light to find leaking refrigerant is the _________ method.

Fluorescent Dye

Which of the following terms is used to specify the speed at which gas can be pumped through a vacuum pump?

Free air displacement

When a service valve blocks the flow of refrigerant through the valve by closing off its regular passageway, it is ___________.

Front Seated

Large refrigerant cylinders are protected against bursting by a _____________.

Fusible Plug

Recovery cylinders have two valves, which are generally marked _________.

Liquid and Gas

There are 3 main types of refrigerant cylinders that an HVACR technician uses.

1. Storage cylinder 2. Disposable cylinder 3. Recovery cylinder

3- to 5-ton residential systems

1.5 cfm

Cylinders that contain a non corrosive refrigerant must be inspected every _________ years.

10 years

Over 100 tons

10-15 cfm

Disposable cylinders should be stored at temperatures below _________ to prevent refrigerant pressure buildup.

125°F (25°C)

A disposable cylinder should be evacuated down to _________ before being disposed of or recycled.

15 psia

Mostly used for checking pressure, a(n) _________ does not have a service to control the flow of refrigerant.

Access Port

A service port is closed off from the refrigeration system when the service valve is _________.

Back seated

When a system is running in normal operation, a service valve should be ____________.

Back seated

Which of the following corresponds to the positions of a gauge manifolds valves during systems evacuation?

Both valves open

The device inside a mechanical pressure gauge that straightens as pressure is increased is called a(an)

Bourdon Tube

The operating element used in pressure gauges that is made of a thin-walled tube of metal bent into a circular shape is called a ____________.

Bourdon Tube

A low-cost method used to confirm exact leak location.

Bubble Solution

The leak detection method involving the application of a soap and water solution to areas where leaks are suspected is the ___________ method.

Bubble Solution

A pressure gauge designed to measure pressure above and below atmospheric pressure is a __________

Compound gauge

When a service valve stem is turned so that it is just lifted off the back seat, it is considered __________.

Cracked Open

Which governmental body sets refrigerant cylinder regulations?

Department of Transportation (DOT)

An instrument used to monitor the weight of a refrigerant cylinder as refrigerant is being charged into or recovered from a system is a ____________.

Digital Charging Scale

During normal system operation, hot high-pressure refrigerant vapor flows through the __________ service valve.

Discharge

Which of the following is a compressor service valve on the high side of a system?

Discharge service valve

May require a plastic tip guard so the probe tip does not contact surfaces.

Electronic Detector

Which system procedure is normally done with both hand valves opened on a gauge manifold connected to a refrigeration system?

Evacuation

Which two colors are recovery cylinders painted in order to distinguish them from disposable cylinders?

Gray and Yellow

The leak detection method that involves burning a fuel gas near a copper plate and using a rubber hose to siphon air from areas suspected of leaking refrigerant is the _________ method.

Halide Torch

Uses rubber hose to "sniff" for leaks.

Halide Torch

A pressure gauge that can read high-pressure values on a single continuous scale, from 0 up to 800 psi, is a ____________.

High-Pressure gauge

When a service valve stem is turned so that it is halfway between front and back seats, it is considered __________.

In Mid-Position

A technician must use a ________ to access small hermetic systems that do not have service valves or access ports.

Piercing Valves

WHich of the following is a disadvantage of using an electronic leak detector?

Produces false alarms near urethane insulation

The process of removing unwanted air, vapors, dirt, or moisture from gauge manifold hoses by venting them to the atmosphere is called ________.

Purging

To reduce the amount of refrigerant released to the atmosphere when connecting hoses, ____________ fitting can be used.

Quick-connect

Reprocessing a refrigerant so that it is chemically pure defines ______ a refrigeration.

Reclaiming

Vacuum gauges use the following units to measure vacuum pressure except __________.

psi