5
Flush Refrigerant Lines
Refrigerant lines must be flushed by a licensed, EPA certified
refrigerant technician in accordance with established procedures.
NOTES:
■
R-410A outdoor systems are not recommended for use with
indoor systems that have used R-22 as the refrigerant.
However, if this unit is being matched with an approved line
set or indoor coil which was previously charged with R-22
refrigerant, or if it is being matched with a coil which was
manufactured before January 1999, the R-22 coil and line set
must be flushed prior to installation.
■
Check the refrigerant lines for size and length. See “Connect
Refrigerant Lines.”
■
Polyol ester (POE) oils are used in Whirlpool units charged
with R-410A refrigerant. Residual mineral oil from the R-22
system can act as an insulator, inhibiting proper heat transfer.
It can also clog the thermal expansion valve, reducing system
performance and capacity.
■
Failure to properly flush the system according to the following
instructions will void the warranty.
Tools and Parts
Flushing Connections
NOTE: The inverted R-22 cylinder must contain at least the same amount of refrigerant as was recovered from the existing system.
1. Disconnect power.
2. Remove the refrigerant from the existing system according to
the manufacturer’s instructions provided with the recovery
system being used. Connect the R-22 gauge set is
connected to both sides of the refrigerant system (as shown),
and verify that the entire system is void of refrigerant in
accordance with the manufacturer’s instructions provided
with the recovery system being used.
3. Disconnect the liquid and vapor lines from the existing
outdoor unit.
4. Remove the existing outdoor unit.
5. Set the new R-410A outdoor unit and connect the refrigerant
lines. See “Connect Refrigerant Lines” steps 1 through 5. Do
not evacuate the lines.
6. Remove the existing R-22 refrigerant flow control orifice and
reconnect piping or remove thermal expansion valve on the
indoor coil, and use a field provided fitting to reconnect the
lines.
Thermal Expansion Valve
■
2 clean R-22 recovery
cylinders
■
Oilless recovery machine
with a “pump down” feature
■
Gauge set for R-22
refrigerant
■
Gauge set for R-410A
refrigerant
A. Existing indoor coil
B. Existing vapor line
C. Inverted R-22 cylinder (contains clean
R-22 to be used for flushing)
D. Vapor line service valve
E. Outdoor system
F. Low pressure
G. High pressure
H. Gauge manifold
I. Closed
J. Opened
K. Liquid line service valve
L. Existing liquid line
M. Tank return
N. Inlet
O. Discharge
P. Recovery machine
Q. Recovery cylinder
R. Vapor
S. Liquid
F
G
D
A
E
P
K
N
O
M
I
J
L
Q
B
C
S
R
H
A. Thermal expansion valve
A
