Condenser Systems Flashcards
7 cards from real RSES practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Condenser Systems flashcards as text
A technician measures 15°F of subcooling at a water-cooled condenser operating at design conditions. This indicates:
Answer: Normal operation with adequate liquid seal at the metering device
15°F of subcooling is within the normal range and confirms the metering device receives a full column of liquid refrigerant without flash gas.
What causes 'refrigerant migration' to the condenser during an off cycle?
Answer: Low ambient temperature making the condenser the coldest part of the system
During the off cycle in cold weather, the condenser becomes the coldest point and refrigerant vapor migrates to it, condensing and accumulating there.
An air-cooled condenser with recirculated hot discharge air will show which symptom?
Answer: Abnormally high condensing pressure despite normal ambient temperature
Recirculated hot air raises the effective entering air temperature at the condenser, elevating condensing pressure above what the true ambient would cause.
In a parallel condenser configuration with multiple refrigerant circuits, what is the main balancing concern?
Answer: Ensuring equal refrigerant distribution to prevent liquid pooling in one circuit
Unequal distribution causes liquid to pool in one circuit while another starves, reducing overall heat rejection and causing operational problems.
Which ASHRAE standard provides guidelines for cooling tower and evaporative condenser water treatment to prevent Legionella?
Answer: ASHRAE 188
ASHRAE Standard 188 establishes minimum risk management requirements for water management programs in building water systems, including cooling towers and evaporative condensers.
A condenser with an excessive temperature difference between refrigerant condensing temperature and leaving water temperature (large approach) indicates:
Answer: Fouled tubes, low water flow, or non-condensable gases
A large condenser approach temperature means heat transfer is impeded, most commonly by fouled tubes, restricted water flow, or non-condensable gases blanketing the surface.
When replacing condenser fan blades on a rooftop unit, a technician must verify:
Answer: The blade pitch angle matches the original design specification
Blade pitch angle directly determines airflow volume and static pressure capability; incorrect pitch can cause inadequate airflow or motor overload.