HVA275 Commercial Refrigeration
Comprehensive Resource To Help You Ace 2026-2027 Includes Frequently Tested Questions With ELABORATED
100% Correct COMPLETE SOLUTIONS Guaranteed Pass First Attempt!!
Current Update!!
The approximate box temperature of a medium temper-
35° Box Temp.
ature walk- in refrigerator is:
Walk-ins usually have lower box temperatures than
walk-ins are designed for longer term storage.
reach-ins because:
A walk-in refrigerator and an A/C system are both R22 and
the ambient air at their condensers is 95°. The A/C unit's about the same as the walk-in refrigerator.
condensing temperatures will be:
The evaporator temperature has to be lower than the box heat goes to cold; the heat in the box must transfer to the
temperature because: refrigerant in the evaporator.
The condensing temperature has to be higher than the heat goes to cold; the heat in the condenser must transfer
ambient air temperature because: to the ambient air.
What is the approximate condensing temperature of any
100°
R22 unit at 195 psig?
What should be the condensing temperature of a stan-
115°
dard eflciency medium temperature refrigeration
If the R22 evaporator temperature is 25°, what is its suc-
49 psig
tion pressure supposed to be?
between the discharge of the compressor and the inlet of
The high side of a refrigeration system is:
the metering device.
The evaporator temperatures of the walk-in refrigerator
Lower
will be than an AC unit
The temperature of the refrigerant inside the evaporator
What is considered the "Evaporator Temperature"?
tubing
How do you calculate evaporator temperature from the
Use a pressure/temperature (P/T) chart
suction pressure?
Subtract the saturated suction temperature from the box
How is evaporator TD calculated for a walk-in cooler?
temperature
, When the evaporator is subject to higher temperature and
What is "Hot Pull-Down"?
loads than under normal operating conditions
During a hot pull-down what is the evaporator experienc-
Starving because the refrigerant is boiling ott quickly
ing?
What is the approximate humidity in a walk-in refrigerator
85% Humidity
with a 10º TD evaporator?
As TD increases, how does it attect box humidity? Decreases humidity
If airflow across an evaporator is decreased, what ettect
Evaporator temperature and suction pressure both de-
does it have on evaporator temperatures and suction
crease
pressure?
Why are multiple circuits used on larger evaporator coils? They provide more capacity than single circuit evaporators
If the suction pressure of an R-22 unit is 55 psig, what is
30 deg.
the approximate evaporator temperature?
If the suction pressure of an R-404A unit is 21 psig, what
-14 deg.
is the approximate evaporator temperature?
How do you determine the evaporator superheat of a Subtract evaporator temperature from the temperature of
refrigeration system? the suction line at the expansion valve bulb
A -10°F walk-in freezer using R-404A has a suction pres-
sure of 15 psig. The suction line temperature at the TXV 2 deg.
bulb is -20º. What is the evaporator superheat
With a 2 degree superheat, is the evaporator normal,
Flooded
flooded, or starving?
Within how many degrees of the design box temperature
5 deg
can you check evaporator superheat?
Why is wide evaporator fin spacing necessary in a freezer
Frost buildup will not occur as fast if the fin spacing is wide
evaporator?
Comprehensive Resource To Help You Ace 2026-2027 Includes Frequently Tested Questions With ELABORATED
100% Correct COMPLETE SOLUTIONS Guaranteed Pass First Attempt!!
Current Update!!
The approximate box temperature of a medium temper-
35° Box Temp.
ature walk- in refrigerator is:
Walk-ins usually have lower box temperatures than
walk-ins are designed for longer term storage.
reach-ins because:
A walk-in refrigerator and an A/C system are both R22 and
the ambient air at their condensers is 95°. The A/C unit's about the same as the walk-in refrigerator.
condensing temperatures will be:
The evaporator temperature has to be lower than the box heat goes to cold; the heat in the box must transfer to the
temperature because: refrigerant in the evaporator.
The condensing temperature has to be higher than the heat goes to cold; the heat in the condenser must transfer
ambient air temperature because: to the ambient air.
What is the approximate condensing temperature of any
100°
R22 unit at 195 psig?
What should be the condensing temperature of a stan-
115°
dard eflciency medium temperature refrigeration
If the R22 evaporator temperature is 25°, what is its suc-
49 psig
tion pressure supposed to be?
between the discharge of the compressor and the inlet of
The high side of a refrigeration system is:
the metering device.
The evaporator temperatures of the walk-in refrigerator
Lower
will be than an AC unit
The temperature of the refrigerant inside the evaporator
What is considered the "Evaporator Temperature"?
tubing
How do you calculate evaporator temperature from the
Use a pressure/temperature (P/T) chart
suction pressure?
Subtract the saturated suction temperature from the box
How is evaporator TD calculated for a walk-in cooler?
temperature
, When the evaporator is subject to higher temperature and
What is "Hot Pull-Down"?
loads than under normal operating conditions
During a hot pull-down what is the evaporator experienc-
Starving because the refrigerant is boiling ott quickly
ing?
What is the approximate humidity in a walk-in refrigerator
85% Humidity
with a 10º TD evaporator?
As TD increases, how does it attect box humidity? Decreases humidity
If airflow across an evaporator is decreased, what ettect
Evaporator temperature and suction pressure both de-
does it have on evaporator temperatures and suction
crease
pressure?
Why are multiple circuits used on larger evaporator coils? They provide more capacity than single circuit evaporators
If the suction pressure of an R-22 unit is 55 psig, what is
30 deg.
the approximate evaporator temperature?
If the suction pressure of an R-404A unit is 21 psig, what
-14 deg.
is the approximate evaporator temperature?
How do you determine the evaporator superheat of a Subtract evaporator temperature from the temperature of
refrigeration system? the suction line at the expansion valve bulb
A -10°F walk-in freezer using R-404A has a suction pres-
sure of 15 psig. The suction line temperature at the TXV 2 deg.
bulb is -20º. What is the evaporator superheat
With a 2 degree superheat, is the evaporator normal,
Flooded
flooded, or starving?
Within how many degrees of the design box temperature
5 deg
can you check evaporator superheat?
Why is wide evaporator fin spacing necessary in a freezer
Frost buildup will not occur as fast if the fin spacing is wide
evaporator?
