P & T -Manifold AssignmentPlease bold or highlight your answers to the following questions, them
submit online. Please do not copy and paste answers!
1. When is it best to purge the air out of the hoes when changes a system? ( 1
Point)
A-When charge is finished
B-During the charging process
C-Prior to charging
D- Air does not need to be purged
2. When is it best to purge the air out of the hoses when the recovering a system?
(1 point)
A- Air does not need to be purged
B-prior to recovery
C- When recovery is finished
D-during the recovery process
3. The needle on the compound gauge points to the pressure while also lining up
with the saturated temperatures. (1 Point) True or False
4. Refrigerant gauges have built in Pressure and Gas charts. True or False (1 point)
5. When connecting you manifold gauges to the high and low side of the system, the
handle to the high side be opened to the middle hose? (1 point) True or False
6. Recovery Machines have built- in Filter dryers. (1 point) True or False
7. Please explain how manifold gages read pressure. (2 points) Hint- Chapter 1
Manifold gauges measure refrigerant pressure on the high and low sides of a
system. The blue gauge shows the low-side (suction) pressure, and the red gauge
shows the high-side (discharge) pressure. Each gauge has a corresponding
temperature scale to help determine if the system is running within normal
pressure-temperature ranges for the refrigerant being used.
8. When connecting your gauges to a A/C system, what main 2 pieces of PPE
should you be wearing prior to starting this task? (2 points)
You should wear safety glasses and gloves when connecting gauges to an A/C
system.
9. When connecting to the low side of the unit, what colour represents the low
pressure (vapor) side of the gauges? (1 point)
The blue gauge represents the low-pressure (vapor) side when connecting
to the low side of the unit.
10. Please explain why it is important to ensure both the high side and low side
handles on your gauges are fully closed before connecting to a running air
conditioner? Also what component could get damaged if the handles were open?
(2 points)
It’s important to ensure both the high-side and low-side handles are fully closed
before connecting to a running air conditioner to prevent refrigerant from leaking
or entering the gauges too quickly. If the handles are open, it could cause a
sudden pressure fluctuation, potentially damaging components like the
compressor or causing refrigerant to leak out of the system, which could lead to
system damage or inefficiency.
11. Please explain how a vacuum pump is connected with manifold gauges and what
is recommended to correctly vacuum down a system? (2 points)
A vacuum pump is connected to the middle (yellow) hose of the manifold gauges.
The process of vacuuming down a system involves using the vacuum pump to
remove air and moisture from the system to create a deep vacuum.
Connect the vacuum pump to the manifold's middle hose.
Close the manifold valves and turn on the vacuum pump.
This helps prevent moisture from causing corrosion or freezing in the system.
12. Evacuating the system is necessary because the air and non-condensable gases
take up space, contain moisture and cause excessive pressures. (1 point) True or
False
13. The Filter Drier is installed on the vapor line to trap any water and debris from
flowing through the system. (1 point) True of False
14. What best describes this definition- Both liquid and vapor exist at the same
moment, in the same location. (1 point)
A- Mixed
B-Blended Refrigerate
C- Saturated
D- Combined
15. This valve changes the direction of the refrigerant flow in a system.( 1 point)
A- TXV
B- Reversing Valve
C- Service Valve
DHeat pump
Using the chart, please answer the following questions in
Degrees Fahrenheit.
16. What is the saturated temperature of R-22 at 84 PSIG? (2 points)
50 F
17. What is the saturated temperature of R-410A at 170 PSIG? (2 points)
60F
18. What is the saturated temperature of R-410A at 365 PSIG? (2 points)
110F
19. If R-22 saturated refrigerant is at a pressure of 168 PSIG, what temp should it be?
(2 points)
90F
20. If R410A saturated refrigerant is at a pressure of 118 PSIG, what temp should it
be?
(2 points)
40F
21. If R140A saturated refrigerant is at a pressure of 295 PSIG, what temp should it
be? (2 points)
91F
Reading Manifold Gauges
Please answer the following questions
1. A-110
B-320
2. A-130
B-310
3. A-115
B-
350
4. A-
70
B-
225