Pumps for hydronic heating systems are usually :

Pumps for hydronic heating systems are usually
 
  A) centrifugal pumps B) diaphragm pumps C) gear pumps D) piston pumps

 Q. 2

What is the difference between a standard liquid line drier and a filter that is designed to be used following a flush procedure?
 
  A) Regular driers will remove smaller particles but not much moisture.
  B) Cleanup driers are all bi-flow driers.
  C) Regular driers are all bi-flow driers.
  D) Cleanup driers will remove smaller particles but less moisture.

 Q. 3

You will never see a pump with a profile of
 
  A) low pressure and high flow. B) high pressure and high flow.
  C) high pressure and low flow. D) low pressure and low flow.

 Q. 4

After flushing the lines and coils, the flush should be purged out:
 
  A) With nitrogen.
  B) With mineral spirits.
  C) With the same type of refrigerant the system uses.
  D) With compressed air.

 Q. 5

When flushing the system, you should:
 
  A) Disconnect the lines and flush through them separately.
  B) Flush through the entire system through the service valves.
  C) Always flush through the accumulator to remove accumulated debris.
  D) Flush through the compressor first.

 Q. 6

Why is nitrogen used to purge the system before using the flushing solvent?
 
  A) Nitrogen is cheaper.
  B) Nitrogen is more effective.
  C) Nitrogen will blow open the clogs
  D) The flush is activated by the presence of nitrogen

 Q. 7

If some components are not functioning, and the system has line and control voltage, you should next:
 
  A) Replace the starter components.
  B) Repair the circuit to the components.
  C) Determine if the components are receiving voltage.
  D) Replace the components.