313D Exam - V6 (Complete) Flashcards
When brazing in a reversing valve, the maximum temperature the valve should be exposed to is?
250F
The maximum temp increase in a reversing valve for a suction gas entering to leaving is?
5 Degrees
The outer bottom ports of a reversing valve are connected to?
Indoor and outdoor coils
The bottom middle port of a reversing valve is connected to?
Compressor suction
The top port of a reversing valve, which is all by itself, is hooked up to?
Compressor discharge
The coil of the reversing valve is energized by what terminals?
O and C
The two main parts of a reversing valve are?
Main body and solenoid coil
When heat provided by a heat pump equals the heat loss of a structure this is called?
Balance point
The defrost terminates on time, or when the refrigerant leaving the outdoor coil reaches?
50F
The defrost cycle initiated when the refrigerant leaving the outdoor coil in the heating mode reaches
28F
True or False
Resistance converts electrical energy to another form of energy
True
Electrons flow because…
- They repel each other
- Moving magnetic fields induce flow
- They are attracted to positive ions
What type of refrigerant is an HFC refrigerant?
R410A
A potential relay…
- Has contacts that are normally closed
- Uses voltage from the start winding to operate the contacts
- Disconnects the start winding
The coil voltage of a relay is always identical to the contact rating…true or false?
False
An amperage relay…
- Briefly engages the start winding
- Uses run winding amperage to operate
Motor loads require what kind of fuse…
Time delay fuses
Nitrogen is?
Nontoxic
Which type of refrigerant does not deplete the stratospheric ozone?
R410A
The depletion of stratospheric ozone is a global problem because excess ultra violet radiation from the sun is now reaching our planet. T or F?
True
There are now 2 refrigerants in use for residential air conditioning and both are global warming and greenhouse gases.
T or F ?
False
What type of refrigerant is a blend?
R410A
R22…
- Is an HCFC
- Will be completely phased out by Jan 1, 2030
- Has chlorine in it
What is a concern with R410A?
- It’s operating pressures are much higher than R22
- It’s lubricant is very hygroscopic
Refrigeration is not about cold; it is about heat, and the moving of heat
T or F?
True
A technician is replacing a faulty capacitor. The one being removed is 35MFD, 440 V. Which of the following scenarios is acceptable?
A. 20MFD, 570V and 17MFD, 440V connected on parallel
B. 20MFD, 370V and 15MFD, 370V connected in series
C. 20MFD, 370V and 15 MFD, 370V connected in parallel
D. 20 MFD, 220V and 17MFD, 220V connected in series
A
The capacitor on a CSIR motor…
Increases starting torque
When brazing in a reversing valve, the maximum temperature the valve should be exposed to is?
250F
A technician is replacing a faulty capacitor. The capacitor being removed is rated as: 27MFD, 440V. Which of the following is considerable for use?
A. 27MFD, 370V
B. 54 MFD, 370V
C. 20MFD, 440V
D. 30MFD, 570V
D
