Type II — High-PressureQuestion 149 of 240
A technician is about to add liquid refrigerant into the suction line of a running compressor to charge faster. Why is this dangerous on a Type II system?
a.It can slug the compressor
b.It cools the refrigerant too much
c.It only affects R-410A systems
d.It has no effect on the compressor
Explanation
Feeding liquid directly into the suction of a running compressor can cause liquid slugging, which can bend valves or break internal parts because liquid does not compress. When adding liquid to the low side, it must be metered or throttled so it flashes to vapor before reaching the compressor. This risk applies to high-pressure systems in general, not just R-410A.
This topic, taught in full in the EPA Section 608 Certification guide. EPA 608 Universal Study Guide (2026) — Core + Type I/II/III, with the 2027 A2L update — PDF + EPUB, $14.99 · 14-day refund →
Practice all 240 questions free — no signup required.
Own the complete EPA Section 608 Certification guide — PDF + EPUB, $14.99 →
Related questions on this topic
- A technician needs to evacuate a Type II system to remove moisture and reaches 500 microns on the micron gauge. After isolating the pump, the reading climbs and stabilizes around 5,000 microns. What does this most likely indicate?
- A technician recovers R-22 from a rooftop unit that holds 150 pounds using equipment made after November 15, 1993. To what vacuum must the system be evacuated during recovery?
- A technician is deciding between liquid and vapor recovery on a Type II system with a moderate charge. Which statement correctly compares the two?
- A technician replaces a leaking evaporator on an R-410A system and must protect the new POE oil during the repair. Why is POE oil handling important?
- Virgin (newly produced) HCFC-22 was subject to a production and import phaseout. As of January 1, 2020, what happened to the supply of virgin R-22?
- A technician measures subcooling of 3°F on a TXV-equipped R-410A system when the manufacturer specifies 10°F of subcooling. What does the low subcooling most likely indicate?
Last reviewed: · editorial process
PrepPass team · Verified against EPA Section 608 Technician Certification Exam · How we review