Low-pressure appliance, refrigerant boils at or below 85 F. Which pressurizing method may you not use?
Nitrogen that needs subsequent purging.
- Nitrogen that requires purging afterward ✔
- Controlled hot water
- A built-in heating device
Why: For refrigerants boiling at or below 85 F at standard atmospheric pressure, EPA says not to use methods such as nitrogen that need subsequent purging. EPA's Type III topics list controlled hot water or a built-in heating device as the allowed ways.
Huh, didn't know that: For refrigerants boiling above 85 F, use heat first, then nitrogen only to raise from the heated level to atmospheric pressure.
The chiller asked for warm water, not the cold shoulder.
References
Answer: Nitrogen that requires purging afterward. For refrigerants boiling at or below 85 F at standard atmospheric pressure, EPA says not to use methods such as nitrogen that need subsequent purging. EPA's Type III topics list controlled hot water or a built-in heating device as the allowed ways.
- 40 CFR 82.156 Required practices (Cornell LII) www.law.cornell.edu/cfr/text/40/82.156
must not use methods such as nitrogen that require subsequent purging
Checked 2026-10-10. - EPA Section 608 Technician Certification Test Topics www.epa.gov/section608/test-topics
Allowable methods for pressurizing a low-pressure system for a non-major repair (controlled hot water and system heating/pressurization device such as Prevac)
Checked 2026-10-10.
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