How does a motorized zone control valve work?
What will be an ideal response?
When the thermostat calls for heat it will begin to open to allow for water to flow and also signal the circulator to turn on.
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A baffle that is designed to deflect high velocity fluids inside a heat exchanger.
a. longitudinal baffle b. horizontal baffles c. vertical baffles d. impingement baffles
Respiration by plant and animal cells along with photosynthesis releases oxygen and consumes carbon dioxide
Indicate whether the statement is true or false
Evacuation will proceed faster:
A) With Schrader valve cores removed. B) With Schrader valve cores in place. C) With Schrader valve cores in place using positive shutoff hoses. D) With hoses that have positive shutoff check valves.
Why can a compound gauge NOT indicate when a system is properly evacuated?
A) Compound gauges don't read vacuum. B) It can only show inches, and there are 25,400 microns in one inch. C) The Bourdon tube will suck completely flat. D) The gas volume in the Bourdon tube will prevent the system from pulling down.