ESCO Commercial Refrigeration
(Final Study Guide)
Comprehensive Resource To Help You Ace 2026-2027
Includes Frequently Tested Questions With ELABORATED
100% Correct COMPLETE SOLUTIONS Guaranteed Pass First
Attempt!! Current Update!!
1. When cleaning an air cooled condenser: - Correct Answer: you should
wash opposite the direction of the airflow
2. The first check to make whenever working on a water-cooled system is: -
Correct Answer: condenser water flow
3. In a water-cooled condenser, what does an increase in head pressure and a
decrease in temperature difference across the condenser indicate? -
Correct Answer: scaling on tubing
4. Why do some commercial buildings need air conditioning in the winter? -
Correct Answer: Commercial buildings often have large internal heat
loads from people, lights, and machines.
5. How can scaling be reduced in water towers? - Correct Answer: There is
a small amount of water drained off the cooling tower sump.
,6. How can water-tubing fouling be prevented in tube-and-shell water-cooled
condenser systems? - Correct Answer: Through annual draining of the
water, removing access plates, and running brushes through the water
tubes
7. What is the difference between the compressor operating temperatures in
an air-cooled condenser and a water-cooled condenser? - Correct
Answer: A water-cooled condenser operates 15°F below an air-cooled
condenser.
8. The fins on finned tube coils increase heat transfer by: - Correct Answer:
increasing the surface area exposed to the air
9. How many BTUs does each pound of water evaporating remove? -
Correct Answer: 970
10.The three basic types of condensers used with HVACR systems are: -
Correct Answer: Air cooled, water cooled, and evaporative.
11.If the refrigerant is recovered improperly from a water-cooled condenser: -
Correct Answer: the water may freeze
12.If the refrigerant condensing saturation temperature is 100°F at the start of
the process, what would the entering water temperature be? - Correct
Answer: 80 degrees F
,13.Which type of condenser generally operates with a lower discharge
pressure? - Correct Answer: Water cooled condensers
14.Which type of condenser is on the back of a non-frost-free refrigerator? -
Correct Answer: A natural-draft air-cooled condenser
15.What is the primary difference between air cooled condensers on standard
efficiency systems and air cooled condensers on high efficiency systems? -
Correct Answer: The coil size is increased to increase the heat transfer
area.
16.Why are biocides added to cooling-tower water? - Correct Answer: To
reduce biofilm
17.If the water entering a water cooled condenser is 80°F, what would the
leaving water temperature be? - Correct Answer: 90 degrees F
18.Which type of condenser uses a fan to push air across the condenser? -
Correct Answer: A forced-draft air-cooled condenser
19.What is the primary advantage of a remote air cooled condenser on an ice
machine? - Correct Answer: The heat generated by the ice machine is
expelled outside instead of in the kitchen.
20.The primary cause of high condensing temperatures in water cooled
condensers is: - Correct Answer: Scaled and fouled condenser surfaces.
, 21.Fan cycling, fan speed control, damper control, and condenser flooding are
different types of: - Correct Answer: condenser low ambient controls
22.A device used to evenly distribute mixtures of liquid and vapor refrigerant
leaving the TEV to multiple evaporator circuits is called a: - Correct
Answer: refrigerant distributor
23.An R22 refrigeration system requires a superheat of 8°F. If the evaporator
saturation pressure is 43 psig, what should the bulb temperature be? -
Correct Answer: 28 degrees F
24.Which of the following best describes the purpose of a distributor? -
Correct Answer: To equally distribute refrigerant
25.Automatic expansion valves are good at maintaining a constant: -
Correct Answer: temperature
26.Which metering device used on flooded evaporators opens when more
refrigerant evaporates, enabling the refrigerant to flow into the evaporator?
- Correct Answer: low side float
27.A restricted inlet screen on a TEV can cause: - Correct Answer: Low
suction pressure, low superheat, and low subcooling.
(Final Study Guide)
Comprehensive Resource To Help You Ace 2026-2027
Includes Frequently Tested Questions With ELABORATED
100% Correct COMPLETE SOLUTIONS Guaranteed Pass First
Attempt!! Current Update!!
1. When cleaning an air cooled condenser: - Correct Answer: you should
wash opposite the direction of the airflow
2. The first check to make whenever working on a water-cooled system is: -
Correct Answer: condenser water flow
3. In a water-cooled condenser, what does an increase in head pressure and a
decrease in temperature difference across the condenser indicate? -
Correct Answer: scaling on tubing
4. Why do some commercial buildings need air conditioning in the winter? -
Correct Answer: Commercial buildings often have large internal heat
loads from people, lights, and machines.
5. How can scaling be reduced in water towers? - Correct Answer: There is
a small amount of water drained off the cooling tower sump.
,6. How can water-tubing fouling be prevented in tube-and-shell water-cooled
condenser systems? - Correct Answer: Through annual draining of the
water, removing access plates, and running brushes through the water
tubes
7. What is the difference between the compressor operating temperatures in
an air-cooled condenser and a water-cooled condenser? - Correct
Answer: A water-cooled condenser operates 15°F below an air-cooled
condenser.
8. The fins on finned tube coils increase heat transfer by: - Correct Answer:
increasing the surface area exposed to the air
9. How many BTUs does each pound of water evaporating remove? -
Correct Answer: 970
10.The three basic types of condensers used with HVACR systems are: -
Correct Answer: Air cooled, water cooled, and evaporative.
11.If the refrigerant is recovered improperly from a water-cooled condenser: -
Correct Answer: the water may freeze
12.If the refrigerant condensing saturation temperature is 100°F at the start of
the process, what would the entering water temperature be? - Correct
Answer: 80 degrees F
,13.Which type of condenser generally operates with a lower discharge
pressure? - Correct Answer: Water cooled condensers
14.Which type of condenser is on the back of a non-frost-free refrigerator? -
Correct Answer: A natural-draft air-cooled condenser
15.What is the primary difference between air cooled condensers on standard
efficiency systems and air cooled condensers on high efficiency systems? -
Correct Answer: The coil size is increased to increase the heat transfer
area.
16.Why are biocides added to cooling-tower water? - Correct Answer: To
reduce biofilm
17.If the water entering a water cooled condenser is 80°F, what would the
leaving water temperature be? - Correct Answer: 90 degrees F
18.Which type of condenser uses a fan to push air across the condenser? -
Correct Answer: A forced-draft air-cooled condenser
19.What is the primary advantage of a remote air cooled condenser on an ice
machine? - Correct Answer: The heat generated by the ice machine is
expelled outside instead of in the kitchen.
20.The primary cause of high condensing temperatures in water cooled
condensers is: - Correct Answer: Scaled and fouled condenser surfaces.
, 21.Fan cycling, fan speed control, damper control, and condenser flooding are
different types of: - Correct Answer: condenser low ambient controls
22.A device used to evenly distribute mixtures of liquid and vapor refrigerant
leaving the TEV to multiple evaporator circuits is called a: - Correct
Answer: refrigerant distributor
23.An R22 refrigeration system requires a superheat of 8°F. If the evaporator
saturation pressure is 43 psig, what should the bulb temperature be? -
Correct Answer: 28 degrees F
24.Which of the following best describes the purpose of a distributor? -
Correct Answer: To equally distribute refrigerant
25.Automatic expansion valves are good at maintaining a constant: -
Correct Answer: temperature
26.Which metering device used on flooded evaporators opens when more
refrigerant evaporates, enabling the refrigerant to flow into the evaporator?
- Correct Answer: low side float
27.A restricted inlet screen on a TEV can cause: - Correct Answer: Low
suction pressure, low superheat, and low subcooling.
