Refrigeration Installation
R e s i d e n t i a l S p l i t U n i t s - 6 0 H z P u r o n
®
R e v. : 6 D e c . , 2 0 1 1
20
• 3/4” diameter suction lines: 1/4 lb. per foot of line set +
1 lb. per ton for indoor coil.
• 7/8” diameter suction lines: 1/3 lb. per foot of line set +
1 lb. per ton for indoor coil
• 1-1/8” diameter suction lines: 1/2 lb. per foot of line set
+ 1 lb. per ton for indoor coil.
Example: 3-ton system with 40 ft. long line set and 3/4”
suction line.
Line set: 1/4 lb./ft. x 40 ft. = 10 lb.
Indoor coil: 1 lb./ton x 3 tons = 3 lbs. (not required if coil
is removed and lines are connected together)
Total: 10 lbs. + 3 lbs. = 13 lbs. to adequately
Å
ush line
set and indoor coil.
The Flushing Procedure
1. Remove the existing R-22 refrigerant by selecting the
appropriate procedure stated below.
If the unit is not operational, follow steps A-E.
• A.) First, disconnect all power supply to the existing
outdoor unit.
• B.) Connect a clean refrigerant recovery cylinder and
the refrigerant recovery machine to the existing unit
according to the instructions provided with the recovery
machine.
• C.) Remove all R-22 refrigerant from the existing system.
• D.) Check the gauges after shutdown to con
Ä
rm all
refrigerant has been completely removed from the entire
system.
• E.) Disconnect the liquid and vapor lines from the
existing outdoor unit.
If the unit is operational, follow steps F- L.
• F.) First, start the existing R-22 system in the cooling
mode and close the liquid line valve.
• G.) Completely pump all existing R-22 refrigerant into
the outdoor unit. It will be necessary to bypass the low
pressure switch if the unit is so equipped to ensure that
the refrigerant is completely evacuated.)
• H.) The low side system pressures will eventually reach 0
psig. When this happens, close the vapor line valve and
immediately shut the outdoor unit off.
• I.) Check the gauges after shutdown to con
Ä
rm that the
valves are not allowing refrigerant to leak back into the
low side of the system.
• J.) Disconnect power to the indoor furnace or air-
handler to kill low voltage to the outdoor unit.
• K.) Disconnect the power supply wiring from the
existing outdoor unit.
• L.) Unsweat the liquid and vapor lines from the existing
outdoor unit.
2. Remove the existing outdoor unit.
3. Set the new Puron
®
unit in place and braze the liquid
and vapor lines to the unit connections. Connect the low
voltage and line voltage to the new outdoor unit. Do not
turn on power supply to the unit and do not open the
outdoor unit service valves at this time.
4. The indoor coil can be left in place for the
Å
ushing process
or removed.
5. If the indoor coil is removed, the suction and liquid line
must be connected together on the indoor coil end. See
illustration for recommended method for connecting these
together.
6. If the indoor coil is left in place during
Å
ushing, removing
