Unlock document.
This document is partially blurred.
Unlock all pages and 1 million more documents.
Get Access
UNIT 25 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX
25-1) What is the term for slightly opening a valve?
25-2) List three precautions when handling a gauge manifold set.
25-3) What can technicians do to reduce refrigerant loss through Schrader vales when
they are not being used?
25-4) Why is it not always a good idea to install a gauge set and check system
pressure?
25-5) What type of units are required to have service valves?
25-6) What type of units are only required to have process stubs?
25-7) Explain the difference between the back -eated position and the front-seated
position on manual stem service valves.
25-8) When using manual stem service valves, describe how to position both the service
valves and the gauge manifold valves when reading system pressures.
25-9) Why are positive shut off hoses helpful when using Schrader valves?
25-10) What is the purpose of the saddle or piercing valve?
25-11) What is the retard range on compound gauges for?
25-12) What personal protective equipment (PPE) should be worn when using gauge
manifolds?
25-13) What can be done to reduce the risk of exposure to liquid refrigerant spray?
25-14) What is the difference between the two ends of a refrigeration hose?
25-15) What service valves are normally found on a commercial refrigeration system?
25-16) Why do split system heat pumps have three service valves?
25-17) Describe how to remove a gauge manifold set from a system and put most of the
trapped refrigerant back into the system.
Leave the unit running and backseat only the discharge service valve. Crack
25-18) Describe how to purge a gauge manifold set using only the high-side service
valve.
25-19) Describe how to purge a gauge manifold set when connecting to Schrader valves.
25-20) What tool is used to turn the stems on manual stem service valves?
25-21) Describe how split-system installation valves are used?
25-22) Why are bolt-on piercing valves not supposed to remain on systems permanently?
25-23) What is a process tube?
25-24) Why do both the International Mechanical Code and the International Residential
Code require locking valve caps on all outdoor refrigerant access ports?
