CCP Existing-Building Retro-Cx 2

Question 1

During a retro-commissioning investigation, you discover that a chiller is operating at 20% below its rated efficiency. What is the MOST likely first step?

Accepted Answer

Review maintenance logs and conduct a refrigerant charge check

Answer

Reviewing maintenance logs and checking refrigerant charge are low-cost diagnostic steps that often reveal the root cause of chiller efficiency degradation.

Question 2

Which document is the primary deliverable at the END of a retro-commissioning project?

Accepted Answer

Findings and Recommendations Report

Answer

The Findings and Recommendations Report summarizes all identified deficiencies, proposed measures, and projected savings for the owner's decision-making.

Question 3

A VAV box consistently delivers less airflow than its minimum setpoint. After calibrating the flow sensor, the problem persists. What should be investigated next?

Accepted Answer

Duct leakage upstream of the VAV box

Answer

Duct leakage upstream of a VAV box reduces available static pressure, causing actual airflow to fall short of the setpoint even with a properly calibrated sensor.

Question 4

In retro-commissioning, a 'no-cost/low-cost' measure is best described as an improvement that:

Accepted Answer

Requires less than $5,000 in capital and is implemented during the RCx project

Answer

No-cost/low-cost measures are operational or minor adjustments made during the RCx engagement itself, typically with simple paybacks under two years.

Question 5

What is the primary purpose of the 'master list of findings' in a retro-commissioning project?

Accepted Answer

To document all deficiencies identified so they can be prioritized and tracked to resolution

Answer

The master list of findings is a living document that tracks every identified issue, its proposed correction, cost, and status through project closeout.

(CCP) Certified Commissioning Professional Practice Test

(CCP) Certified Commissioning Professional Practice Test

CCP Existing-Building Retro-Cx 2