Page 4
# 48478A006
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. Recom-
mended line length is 50' or less. If more than 50' line set
is required, contact Technical Services at (419) 483-4840.
Table 2 shows the diameters for line sets up to 100'
although vertical lift applications and trapping require-
ments need to be reviewed with Technical Services for
line sets over 50'.
Table 2
Refrigerant Line Set Diameters (in.)
For installations exceeding 50', contact
Technical Services at (419) 483-4840.
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Figure 3
Thermostat Designations
(Some connections may not apply.
Refer to specific thermostat and indoor unit.)
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.
Without Auxiliary Heat
With Auxiliary Heat
Power
Indoor Unit
Thermostat
Common
1st Stage Aux. Heat
Indoor Blower
Reversing Valve
R
W1
G
O
R
C
G
Outdoor Unit
C
Y1
R
W1
O
C
Y1
Power
Common
1st Stage Aux. Heat
W1
W2
W3
Y2
Compressor
Y2
Y1
Y2
If Applicable
Power
Indoor Unit
Thermostat
Common
1st Stage Aux. Heat
R
R
C
Outdoor Unit
C
R
W1
C
Power
Common
1st Stage Aux. Heat
Indoor Blower
Reversing Valve
G
O
G
Y1
Compressor
O
Y1
W1
W2
W3
W1
E
Emergency Heat
Emergency
Heat Relay
Outdoor Thermostat
Y2
Y2
Y1
Y2
If Applicable
this section 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 R22 refriger-
ant, the line set and coil must be flushed prior to installation.
If the unit is being used with an existing 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 installa-
tion of the 4SHP16LT unit.
