Replacement Units; Indoor Coil; Location; Interconnecting Tubing - Rheem R-410A Installation Instructions Manual

5.0 REPLACEMENT UNITS

To prevent failure of a new condensing unit, the existing evaporator tubing system
must be correctly sized and cleaned or replaced. Care must be exercised that the
expansion device is not plugged. For new and replacement units, a liquid line filter
drier should be installed and refrigerant tubing should be properly sized. Test the oil
for acid. If positive, a suction line filter drier is mandatory.
IMPORTANT: WHEN REPLACING AN R-22 UNIT WITH AN R-410A UNIT,
EITHER REPLACE THE LINE SET OR ENSURE THAT THE EXISTING LINE SET
IS THOROUGHLY CLEANED OF ANY OLD OIL OR DEBRIS.

6.0 INDOOR COIL

REFER TO INDOOR COIL MANUFACTURER'S INSTALLATION INSTRUC-
TIONS.
IMPORTANT: The manufacturer is not responsible for the performance and opera-
tion of a mismatched system, or for a match listed with another manufacturer's coil.
CAUTION
Only use evaporators approved for use on R-410A systems. Use of existing R-22
evaporators can introduce mineral oil to the R-410A refrigerant forming two differ-
ent liquids and decreasing oil return to the compressor. This can result in com-
pressor failure.
NOTE: All (-)PRL units must be installed with a TXV Evaporator.
The thermostatic expansion valve is specifically designed to operate with R-410A.
DO NOT use an R-22 TXV or evaporator. The existing evaporator must be
replaced with the factory specified TXV evaporator specifically designed for
R-410A.

6.1 Location

Do not install the indoor coil in the return duct system of a gas or oil furnace.
Provide a service inlet to the coil for inspection and cleaning. Keep the coil pitched
toward the drain connection.
CAUTION
When coil is installed over a finished ceiling and/or living area, it is
recommended that a secondary sheet metal condensate pan be
constructed and installed under entire unit. Failure to do so can result
in property damage.

7.0 INTERCONNECTING TUBING

7.1 Vapor and Liquid Lines
Keep all lines sealed until connection is made.
Make connections at the indoor coil first.
Refer to Line Size Information in Tables 4 and 5 for correct size and multipliers to be
used to determine capacity for various vapor line diameters and lengths of run. The
losses due to the lines being exposed to outdoor conditions are not included.
The factory refrigeration charge in the outdoor unit is sufficient for the unit and 15
feet of standard size interconnecting liquid and vapor lines. For different lengths,
adjust the charge as indicated below.
1/4" ± .3 oz. per foot
5/16" ± .4 oz. per foot
3/8" ± .6 oz. per foot
1/2" ± 1.2 oz. per foot
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