Author Question: Before opening the compressor crankcase to take an oil sample, you should: A) Get the sample tube ... (Read 134 times)

gonzo233 · **on:** Jul 24, 2018

Before opening the compressor crankcase to take an oil sample, you should:

A) Get the sample tube ready because the oil comes out very quickly under pressure.
B) Increase the crankcase pressure with nitrogen to at least 100 psig.
C) Position yourself directly in front of the drain port.
D) Valve off the compressor and recover the refrigerant down to 12 psig.

Question 2

Pumps for hydronic heating systems are usually:

A) Centrifugal pumps. B) Diaphragm pumps.
C) Piston pumps. D) Gear pumps.