In multi-box refrigeration systems, the...

Question 1 / 270705eccef9dbacbc34ba4d45fbe

Question 1 of 270705eccef9dbacbc34ba4d45fbe

In multi-box refrigeration systems, the sensing bulb of the thermostatic expansion valves used on the refrigerated boxes with elevated temperatures should be located where?

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Question 1 of 27070

In multi-box refrigeration systems, the sensing bulb of the thermostatic expansion valves used on the refrigerated boxes with elevated temperatures should be located where?

🔍 Key Concepts

• Thermostatic expansion valve (TXV) sensing bulb purpose in a refrigeration system • How back pressure regulating valves control suction pressure and evaporator temperature • Effect of placing the sensing bulb upstream vs. downstream of another control device

💭 Think About

• Where should the TXV sense temperature/pressure so that it accurately reflects the actual superheat of that specific evaporator coil? • If another valve is changing pressure in the line, how would putting the bulb before or after that valve affect the TXV’s ability to control properly? • In a multi-box system with different temperatures, which component is responsible for maintaining each box’s temperature, and which component is responsible for holding back suction pressure?

✅ Before You Answer

• Identify what variable (temperature/pressure at which point in the system) the TXV sensing bulb MUST see to control refrigerant flow correctly • Determine whether the back pressure regulating valve changes conditions at its inlet or outlet, and how that affects the TXV’s sensing location • Eliminate bulb locations that would cause the TXV to react to conditions not truly representative of that box’s evaporator load and temperature

Question 1 of 27070

In multi-box refrigeration systems, the sensing bulb of the thermostatic expansion valves used on the refrigerated boxes with elevated temperatures should be located where?

in the diffuser fan inlet air stream

in the diffuser fan outlet air stream

before the back pressure regulating valve

after the back pressure regulating valve

Question 1 / 270705eccef9dbacbc34ba4d45fbe

Question 1 of 270705eccef9dbacbc34ba4d45fbe

In multi-box refrigeration systems, the sensing bulb of the thermostatic expansion valves used on the refrigerated boxes with elevated temperatures should be located where?

Back

Question 1 of 27070

In multi-box refrigeration systems, the sensing bulb of the thermostatic expansion valves used on the refrigerated boxes with elevated temperatures should be located where?