Line Set Cleaning for Retrofitting Procedure
When installing a new R410A
1.Before starting any work put on approved safety goggles and nitrile gloves and remember to work only in a properly ventilated area.
2.Recover the existing R22 charge; it is illegal to vent any refrigerant.
3.Disconnect any electrical power feeds to the system including any solenoids or reversing valves.
4.Using a tubing cutter cut the liquid and suction line at both the condensing unit and
the evaporator.
5.Temporarily connect the liquid and suction lines at the evaporator using clear plastic tubing, suitable adapters and hose clamps.
6.Using an injection tool or a compression fitting and adapters, connect a refrigeration service hose to the suction line at the condensing unit location.
7.Position a clean container at the liquid line to catch solvent and contaminants as they are purged from the system. Purged material may include acids, oil and particulate debris which must be disposed of properly.
8.Connect the flush can valve as shown in Figure 1 and 2 or use a valve capable of connecting to 7/16” 28 thread. These valves are currently offered for sale at most refrigeration and
9.Connect the refrigeration service hose or refrigeration manifold set to the can valve and the suction line, invert the
10.Connect the line set to the new evaporator and condensing unit and evacuate and leak check as per current guidelines.
Figure 1 | Figure 2 |