What is considered the "normal" box temperature of a walk-in refrigerator?
35�- 37�
What is considered the "normal" box temperature of a reach-in refrigerator?
38� - 40�
What is considered the "normal" box temperature of a walk-in freezer?
-10�
What is considered the "normal" box temperature of a reach-in freezer?
0�
Why is the temperature of walk-ins usually lower than the temperature of reach-ins?
Walk-ins are designed for long term storage and lower temperatures.
What is the pressure throughout the "high side" of the system?
278 PSIG
At what temperature does the refrigerant condense?
125�
What is the temperature of the subcooled liquid in the condenser?
115�
What is the pressure drop across the TEV?
229 PSIG
R22 refrigerant at 49 psig boils at what temperature?
25�
What is the temperature of the superheated vapor at the outlet of the evaporator?
35�
How can the latent heat in a cold suction line to be transferred to higher outdoor air temperatures?
Compress the suction vapor until its condensing temperature is higher than the ambient.
What is the primary difference between the A/C system of Figure 1-1 and the refrigeration system of Figure 1-2?
The refrigeration unit has to lower the evaporator temperature.
Which refrigerant is used most in recently installed walk-in refrigerators?
R404A
Which refrigerant is used most in recently installed reach-in refrigerators?
R134A
Which refrigerant is used most in recently installed walk-in freezers and reach-in freezers?
R404A
Why do Zeotropic "blends" have temperature glide?
The component refrigerants boil off at different rates.
Under what circumstances should a technician use TROT?
When factory information is not available.