A technician considers injecting a chemical sealing additive into a commercial system that keeps losing a small amount of charge. What is the practical objection to putting that product into this system?
Correct Answer
D) It can plug driers and metering devices and contaminate recovery equipment
Sealing additives work by hardening where they meet air or moisture, which means they can also harden inside filter driers, expansion valves and capillary tubes, and inside the technician's recovery machine and manifold on the next visit. Reclaimers refuse cylinders contaminated with them. On top of the equipment risk, the leak is still there, and the leak provisions call for the leak itself to be repaired rather than masked.
Why This Is the Correct Answer
These products cure when they reach moisture or air, so they can set inside the components that restrict flow, and they follow the refrigerant into any recovery machine, manifold or cylinder used on the system afterward. That turns a single system's problem into a shop-wide one, and a cylinder that carries the additive is rejected by reclaimers. Finding and repairing the leak remains the required outcome.
Why the Other Options Are Wrong
Option A: It raises the refrigerant's boiling point and lowers system capacity
These additives are not present in quantities that would change the refrigerant's thermodynamic properties. The damage they cause is physical blockage.
Option B: It reacts with the refrigerant and forms an acid within a few weeks
Acid in a system comes from moisture reacting with refrigerant and oil at high temperature, which is a separate contamination problem entirely.
Option C: It can only be used on systems charged with a single component refrigerant
Nothing about a blend makes these products safer or more suitable. The objection applies to any system and to the equipment used on it afterward.
Memory Technique
Whatever you pour in comes back out through your own machine. Think about that before opening the bottle.
Reference Hint
Sealing additives can cure inside driers, metering devices and recovery equipment, and they contaminate recovered refrigerant.
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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