After brushing soap solution over a unit that loses a small amount of charge every year, a technician sees bubbles forming right at one of the service ports. What is the appropriate repair?
Correct Answer
C) Replace the schrader valve core and install a proper sealing cap over it
A schrader core is a small spring-loaded valve with a rubber seat that hardens, takes debris, or gets damaged by repeated hose connections. It is one of the most common slow leak sites on high-pressure equipment and one of the cheapest to fix: pull the core with a core removal tool and install a new one. The cap is part of the seal, not just a dust cover, so a new cap with a good gasket goes on afterward. Removing the port or replacing whole tubing sections is unnecessary.
Why This Is the Correct Answer
The core is a serviceable part designed to be replaced. When bubbles form at the port itself, the core seat is the likely culprit, and a new core plus a sealing cap restores two layers of sealing at almost no cost. A core removal tool allows the swap without losing the system charge.
Why the Other Options Are Wrong
Option A: Braze the service port closed and install a new port on the adjacent line
Removing a service port destroys the access a technician needs for every future charge check and diagnosis, and it is a large repair for a part that costs a few dollars to replace.
Option B: Tighten the manifold hose fitting down harder onto the port
Cranking a hose fitting down harder damages the core seat and the port threads. It also does nothing once the hose comes off, which is when the leak is actually occurring.
Option D: Replace the entire line assembly that contains the leaking port
The tubing is not leaking. Replacing a line assembly because of a bad core means brazing new joints that can leak, in place of a part designed to be swapped out.
Memory Technique
Core and cap, two seals. A missing cap means one seal is doing all the work.
Reference Hint
Leaks must be repaired and verified under 40 CFR Part 82, Subpart F. Service port cores and gasketed caps are standard sealing components.
More epa-608-type-2 Questions
A walk-in cooler condensing unit holds a full charge of twenty-five pounds of R-404A, which is below the fifty pound threshold that brings an appliance under the leak repair provisions. What still applies to this unit?
An office building has thirty water source heat pumps on a common water loop, and each one left the factory assembled, hermetically sealed and charged with four pounds of R-410A. How is one of those units classified?
A data sheet for an unfamiliar refrigerant lists a boiling point of about fifty-five degrees Fahrenheit at atmospheric pressure. What does that tell a technician holding Core and Type II certification?
A technician holds Core, Type I and Type III certification and is sent to recover the charge from a twenty ton rooftop unit charged with R-410A. What does that combination of sections allow on this job?
A fleet garage technician holds only the vehicle air conditioning certification issued under Section 609 and is asked to recover the charge from the shop's own rooftop air conditioner. What does that credential allow?
A split system's outdoor unit, indoor coil and the line set the installer ran and brazed between them are being considered. For the purposes of the refrigerant rules, what makes up the appliance here?
On a new installation the line set is brazed to a factory charged outdoor unit and an indoor coil shipped under a nitrogen holding charge, with the outdoor unit's service valves still closed. What does the recovery requirement call for before that brazing?
A rooftop unit's data plate has weathered until the charge figure cannot be read, and the technician needs the full charge to place the appliance under the evacuation and leak provisions. Where should that figure come from?
A computer room air conditioning unit holds forty pounds of R-407C and connects to a remote air cooled condenser through refrigerant piping run and brazed by the installer. How is that unit classified?
A shop's office manager, who holds no technician certification, is sent to a supply house to pick up a new recovery machine for the commercial crew. What does the sales restriction require at that counter?
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Previous Question
The evacuation requirements for high-pressure appliances are stated in inches of mercury vacuum, while the low-pressure requirement is stated as an absolute pressure. What does that difference mean for the instrument a technician needs?
Next Question
After the required evacuation level has been reached and the repair is finished, many technicians keep pulling the system down to a few hundred microns before charging. What is the standing of that deeper vacuum?