Field Notes

Question 1

What should you check a non-acorn Schrader cap for before putting it back on?

Answer 1

Check for a gasket ring

Question 2

What is the humidity percentage at which sweating becomes significant?

Answer 2

55%

Question 3

Can super-heat be set on an empty freezer?

Answer 3

Without a realistic load it is difficult to accurately set superheat.

Question 4

Why must a gaspack RTU have a p-trap on its drain?

Answer 4

Without the p-trap water will be sucked into the duck work and cause a leak.

Question 5

R407A is a retrofits for which older refrigerant in refrigeration applications?

Answer 5

R22

Question 6

mp39 retrofits for which older refrigerant in refrigeration and stationary AC systems?

Answer 6

R12

Question 7

R134a retrofits for which older refrigerant in both refrifrigeration and stationary ac applications?

Answer 7

R12

Question 8

What is medium temp super-heat range?

Answer 8

10°-12°

Question 9

What is low temp super-heat range?

Answer 9

6°-12°

Question 10

What must you remember when washing micro channel condenser coils?

Answer 10

Either use green cleaner or no cleaner at all. Especially not brown or blue.

Question 11

After power loss, what might need to be done to the VFD?

Answer 11

The VFD may have to be restarted.

Question 12

True or False; refrigerant charge can be accurately assessed when the evaporator coil is frozen.

Answer 12

False.