CCP CCP Plumbing & Mechanical Systems 3

Question 1

What is the purpose of a pressure/temperature (P/T) port on a hydronic system component, and how does a Cx agent use it?

Accepted Answer

It allows the insertion of gauges or thermometers to measure pressure and temperature without draining the system

Answer

It provides a connection for chemical injection into the loop

Answer

It serves as a system drain point for maintenance

Answer

It connects to the expansion tank pre-charge valve

Question 2

During commissioning of a cooling tower, what is the significance of verifying the approach temperature?

Accepted Answer

It measures how close condenser water leaving temperature is to the outdoor wet-bulb temperature, indicating tower thermal performance

Answer

It confirms the tower meets fire code setback requirements

Answer

It verifies the tower basin heater operates correctly in winter

Answer

It confirms the tower fan speed matches design RPM

Question 3

A Cx agent is verifying a steam condensate return system. What condition indicates a failed steam trap?

Accepted Answer

Live steam blowing through the trap continuously (trap stuck open) or no condensate passing (trap stuck closed)

Answer

Condensate return temperature below 180°F

Answer

Condensate pump running continuously at design flow

Answer

Condensate receiver tank pressure above 5 psig

Question 4

What is the purpose of a glycol solution in a hydronic system in cold climates, and what must the Cx agent verify about its concentration?

Accepted Answer

Glycol prevents freezing and corrosion; verify the concentration provides freeze protection to the design temperature per the owner's requirements

Answer

Glycol improves heat transfer efficiency; verify concentration for maximum performance at 60%

Answer

Glycol acts as a biocide; verify concentration matches Legionella control requirements

Answer

Glycol reduces pump energy; verify viscosity is within pump curve limits only

Question 5

During commissioning, what is the purpose of flushing and cleaning a new hydronic piping system before connecting it to equipment?

Accepted Answer

To remove construction debris, pipe dope, flux, and scale that could damage pumps, valves, and coils

Answer

To fill the system with chemical treatment solution

Answer

To verify pipe sizing is correct for design flow rates

Answer

To test the integrity of welded pipe joints

Question 6

What is the commissioning agent's role when reviewing plumbing system submittals for fixture flow rates?

Accepted Answer

To verify that submitted fixture flow rates match design specifications and Owner's Project Requirements, flagging discrepancies before installation

Answer

To approve shop drawings on behalf of the engineer of record

Answer

To select the plumbing fixture manufacturer

Answer

To determine the domestic water supply pressure requirements