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
On a hot day, an air-cooled condenser fan motor trips on thermal overload repeatedly. The most likely cause is:
Answer: High ambient temperature causing high amp draw
High ambient temperatures increase condensing pressure, which raises the load on condenser fans and can cause motor overloads to trip.
What is the primary advantage of a microchannel condenser coil over a round-tube plate-fin coil?
Answer: Lower refrigerant charge and improved heat transfer efficiency
Microchannel coils use multiple small parallel channels that improve heat transfer efficiency and significantly reduce refrigerant charge compared to round-tube designs.
A condenser pressure too low in cold ambient conditions can cause which operational problem?
Answer: Liquid floodback to the compressor due to low pressure differential
Very low condensing pressure reduces the pressure differential across the metering device, causing refrigerant to flood back as liquid to the compressor.
When checking a water-cooled condenser with a refrigerant analyzer, where should refrigerant NOT be vented?
Answer: Into the condenser water loop
Venting refrigerant into the condenser water loop contaminates the water system and violates EPA Section 608 venting prohibitions.
The term 'head pressure control' in variable-speed condenser fans refers to:
Answer: Modulating fan speed to keep condensing pressure within a target range
Head pressure control via variable-speed fans modulates airflow to maintain the condensing pressure within an optimal range across varying ambient conditions.
Which type of condenser achieves the lowest condensing temperature relative to ambient conditions?
Answer: Evaporative condenser
Evaporative condensers approach the ambient wet-bulb temperature, which is always lower than the dry-bulb temperature, giving the lowest condensing temperature.
Scale buildup inside water-cooled condenser tubes is best treated by:
Answer: Chemical descaling or mechanical brushing of the tubes
Mineral scale on tube walls acts as insulation; chemical descaling or mechanical brushing restores tube cleanliness and heat transfer.