Appion G5Twin - Page 14

To Next Page

To Previous Page

G5TWIN OPERATION MANUAL

Helpful Hints (continued)

For the fastest recovery speeds, it is necessary to pump out the liquid rst. Using the Direct Connection

procedures in this manual, on a typical system, you should expect the “liquid recovery” stage to move the bulk

of the entire system charge as liquid - this means it should go very quickly for most of the recovery process (in

most larger systems, this could be over 90% of the refrigerant charge).

However, if you observe hot recovery cylinders, or very slow recovery aer only moving a few pounds of

refrigerant, then you likely have input restrictions. You may further conrm input restrictions by checking for

frost or condensation at each hose/port connection between the AC/R System and the recovery machine

(e.g., the system access port, or the inlet tting to the recovery machine). Input restrictions can cause liquid

refrigerant to get trapped behind the restriction, causing recovery to be slower than the expected vapor rate

(see Diagram 8), and unexpectedly adding heat

to the recovery cylinder.

What Happens With Input Restrictions:

Input restrictions will greatly slow down

refrigerant recovery by preventing the full “liquid

ow” from reaching the recovery machine. The

pressure drop caused by the recovery machine

triggers a liquid-to-vapor expansion at the point

of restriction, which drops the temperature of

the liquid refrigerant at the restriction. As the

point of restriction continues to get colder, the

vapor pressure drops, slowing the vapor ow.

Pretty soon, the recovery machine is only receiving a reduced ow of vapor that is now picking up ambient

heat and adding it to the heat of compression. All of this heat is sent along to the recovery cylinder, quickly

raising the recovery cylinder temperature.

Eorts to cool a cylinder are more eective when there is liquid refrigerant, as the liquid aids in transferring

heat through the cylinder walls to the “bucket of ice” or cooled airow. However, if contents of the tank are

mostly vapor, eorts to cool the tank (e.g., airow, ice) could be less eective than expected.

Remove Input Restrictions to Maximize Recovery Performance:

For the fastest recovery times, take the time to address these typical input restrictions before you start:

• Remove core depressors from all of the hose ttings (they block up to 50% of the ow) - See Tip #4

• DO NOT USE refrigerant charging hoses with “quick disconnect” or “auto-shuto” ttings

• Remove “Schrader”-type access valves using a Valve Core Removal Tool - See Tip #4

• Discard of used/worn hoses with deteriorating inner linings

With a full ow of liquid refrigerant, the G5Twin will quickly ll the recovery cylinder with cool liquid. Once the

liquid recovery is complete, the remaining vapor will be pumped into a cooler tank, resulting in lower nal

temperatures and faster overall recovery speeds.

Input Restrictions: Slow Recovery & Hot Recovery Cylinders

TIP #2

Diagram 8