When thermostatic expansion valves are used on heat pump systems, _________________________ thermal bulbs are most common in order to prevent the valve's diaphragm from rupturing.
Fill in the blank(s) with the appropriate word(s).
critically charged
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The scroll-chiller compressor needs crankcase heat and it must be energized for the length of time the manufacturer requires, usually____________________ hours.
Fill in the blank(s) with the appropriate word(s).
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What percentage of the world's plants are C4?
a. 10 c. 80 b. 40 d. 95
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The bulb of UVlamp should be cleaned daily and changed at least:
What will be an ideal response?
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What type of mixing valves sense leaving water temperature and cause the hot and cold controls to reposition themselves if the discharge water temperature changes?
A. pressure balancing B. thermostatic C. combination pressure balancing and thermostatic D. electronic
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