Question 89Refrigeration/AC - QMED70% to pass
How does a refrigeration solenoid valve differ from a modulating valve?
AI Explanation
The correct answer is D.
A liquid line solenoid valve is either completely opened or closed, whereas a modulation valve is infinitely positioned according to the strength of the applied electrical signal. Solenoid valves are binary devices that provide on/off control, while modulation valves can vary the flow rate in proportion to the control input. This makes modulation valves more suitable for fine-tuning and precise temperature control compared to simple on/off solenoid valves.
The other options are incorrect. Option A is incorrect because the two valve types operate differently. Option B is incorrect because solenoid valves can be installed in both liquid and gas lines. Option C is incorrect because solenoid valves can be used in both low and high voltage refrigeration systems, not just low voltage applications.
Related Questions
#87 What is the purpose of the low-pressure cut-out switch as used as a primary controller for a refrigeration system or unit? #88 In a refrigeration system featuring low-side pump down prior to the automatic shutdown of the compressor, the temperature of the refrigerated space is controlled by the action of a thermostat wired to what device? #90 A container unit's microprocessor-controlled temperature controller is set at -28.9°C, appropriate for a frozen cargo of ice cream. In this mode of operation, according to the illustrated temperature controller functional diagrams, what should be the operational status of the unit if the actual box temperature is -18.0°C? Illustration GS-RA-035 #91 The sensing line for the low-pressure cutout switch for a refrigeration system is typically connected at what location? #92 In a multi-evaporator refrigeration system, a solenoid valve is installed in the liquid line prior to what device?