CRD CRD System Commissioning & Performance Testing

Question 1

What is the primary purpose of commissioning a residential geothermal heat pump system before handover to the homeowner?

Accepted Answer

To verify the system operates according to design specifications and performance standards

Answer

To satisfy local permit requirements only

Answer

To train the homeowner on thermostat operation

Answer

To document the installation cost for tax purposes

Question 2

During geothermal system commissioning, what does measuring the system's Coefficient of Performance (COP) verify?

Accepted Answer

The ratio of heating output to electrical energy input

Answer

The total loop field length installed

Answer

The grout thermal conductivity used

Answer

The refrigerant charge weight

Question 3

Which instrument is used to measure ground loop flow rate during commissioning of a closed-loop geothermal system?

Accepted Answer

Flow center with integrated flow meter or a clamp-on ultrasonic flow meter

Answer

A manometer measuring loop pressure only

Answer

A thermocouple attached to the loop pipe

Answer

A megohmmeter testing insulation resistance

Question 4

What entering water temperature (EWT) range to the heat pump is typically required during commissioning of a vertical closed-loop system in the US heating season?

Accepted Answer

25°F to 60°F depending on ground conditions and loop design

Answer

70°F to 90°F to mirror cooling mode

Answer

0°F to 15°F for maximum efficiency

Answer

100°F to 120°F for high-temperature output

Question 5

A geothermal system commissioning technician records a leaving water temperature (LWT) significantly higher than design in cooling mode. What does this most likely indicate?

Accepted Answer

Insufficient ground loop flow rate or an undersized loop field

Answer

Oversized ductwork reducing static pressure

Answer

Incorrect thermostat wiring

Answer

An oversized ground loop with excessive heat rejection capacity

Question 6

Which document is typically completed and left with the homeowner after geothermal system commissioning?

Accepted Answer

A commissioning report including measured flow rates, temperatures, pressures, and COP calculations

Answer

Only the original design drawings without test data

Answer

A blank warranty card with no performance data

Answer

The contractor's internal cost spreadsheet