CSLB C-46 Solar ContractorSolar Thermal System InstallationEasy
A solar thermal installer is preparing to pressure test a newly installed closed-loop glycol system. What is the minimum pressure a solar thermal system should be tested to, relative to its operating pressure?
- A1.0 times the operating pressure
- B2.0 times the operating pressure
- C1.5 times the operating pressure
- D2.5 times the operating pressure
Show answer & explanationAnswer & explanation
Correct answer: C. 1.5 times the operating pressure
Industry standards and plumbing codes typically require pressure testing a system to 1.5 times its maximum anticipated operating pressure to ensure structural integrity and leak-free operation under stress.
Why the other options are wrong
- A. This is insufficient for proper testing and safety margins.
- B. While higher is safer, 2.0 times is not the minimum required and may overstress components unnecessarily.
- D. This is excessively high and could damage system components not rated for such extreme pressures.
Solar Thermal Pressure Testing
The process of subjecting a newly installed solar thermal system to a pressure higher than its normal operating pressure to verify structural integrity and detect leaks.
- Ensures system components and connections can withstand operational stresses.
- Typically performed with water or air before filling with heat transfer fluid.
- Standard minimum test pressure is 1.5 times the operating pressure.
Memory trick: To ensure a solar system is sound, multiply its work by one and a half 'round.