A technician is pulling the remaining vapor charge out of a high-pressure system with a recovery machine and wants the job to move as fast as it safely can. Where should the recovery hoses be connected?
Correct Answer
D) To both the high side and the low side service ports, so refrigerant is drawn out of both halves of the system at once
During the vapor stage of recovery, refrigerant has to travel to whichever port the machine is connected to, and check valves, the metering device and closed service valves can slow or block that travel. Opening both the high side and the low side gives the machine two paths and lets it pull from both halves of the circuit at the same time. That shortens the job and, just as importantly, keeps a section from being isolated with refrigerant still trapped in it. Vapor recovery from a single port on a large system is the slowest way to do it.
Why This Is the Correct Answer
Two connections cut the restriction the machine has to pull through and reach parts of the circuit that a single port cannot. Metering devices, check valves and oil separators all resist vapor flow at low pressure, so drawing from both sides keeps the recovery moving and prevents refrigerant from being stranded behind a restriction.
Why the Other Options Are Wrong
Option A: To the suction service port alone, so that the recovery machine is never exposed to discharge pressure at any stage of the pull
A single low-side connection forces every pound to travel through the metering device before it can leave, which drags the job out and can strand refrigerant on the high side. Recovery machines are built to see system pressure.
Option B: To the liquid line port alone, since that line holds the densest refrigerant and empties the system fastest
The liquid port is the right connection for the liquid stage of recovery, but the question is about the remaining vapor. Vapor drawn through one port only is still restricted by valves and the metering device.
Option C: To the schrader port on the receiver outlet, with every other service port left capped for the pull
One port on the receiver leaves the evaporator and the suction side to bleed back through the metering device. It is a single connection with the same restriction problem as any other single-point hookup.
Memory Technique
Two hoses, two halves. One hose makes the refrigerant squeeze through the metering device.
Reference Hint
40 CFR 82.156 requires recovery before opening an appliance. Connection strategy is technique, not a numeric requirement.
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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