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506468-01Page 4 Issue 1004
this sesction as well as the section that follows entitled
Flushing Existing Line Set and Indoor Coil.
If this unit is being matched with an approved line set or
indoor coil which was previously charged with R-22
refrigerand, the line set and coil must be flushed prior to
installation. If the unit is being used with an exisitng indoor
coil which was equipped with a liquid line which served as a
metering device (RFCI), the liquid line must be replaced prior
to the installation of the 4HP16LT unit.
Field refrigerant piping consists of liquid and suction lines
from the outdoor unit (sweat connections) to the indoor coil
(flare or sweat connections).
Select line set diameters from Table 2 to ensure that oil
returns to the compressor. Size vertical suction riser to
maintain minimum velocity at minimum capacity.
Recommended line length is 50’ or less. If more than 50’
line set is required, contact Technical Services.
Table 2 shows the diameters for line sets up to 100’ although
vertical lift applications and trapping requirements need to
be reviewed with Technical Services for line sets over 50’.
Refrigerant Line Set Diameters (in.)
For installations exceeding 50’, contact
Technical Services.
Table 2
S uction Line
BTUH
Line Set Length and Size
12 f t . 25 ft. 50 ft. 75 ft. 10 0 f t .
3/4 3/4
24,000
7/8
36,000
7/8
7/8
7/8
1-1/8
7/8
7/8
1-1/8
48,000
7/87/8
7/8
1-1/8
1-1/8
60,000 1-1/8
1-1/8
7/8
1-1/8
1-1/8
Liquid Line
BTUH
Line Set Length and Size
12 f t . 25 ft. 50 ft. 75 ft. 10 0 f t .
3/8 3/8 3/8 3/8 3/8
24,000
3/8 3/8 3/8 3/8
3/8 3/8 3/8 1/2
36,000
3/8 3/8 3/8 1/2
48,000
60,000
1/2
1/2
1/2
Figure 3
Thermostat Designations
(Some connections may not apply. Refer to
specific thermostat and indoor unit.)
Without Auxiliary Heat
With Auxiliary Heat
Do not connect C (common) connection between indoor unit and
thermostat except when required by the indoor thermostat. Refer to
thermostat installation instructions. C (common) connection between
indoor unit and outdoor unit required for proper operation.