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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.
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'.
Page 4 of 24
Figure 3
Refrigerant Line Set Diameters (in.)
For installations eceeding 50', contact Technical
Services at (419) 483-4840.
Polyolester (POE) oils used with R-410A refrigerant
absorb moisture very quickly. It is very important that
the refrigerant system be kept closed as much as
possible.
DO NOT remove line set caps or service
valve stub caps until ready to make connections.
Issue 1143
Table 2
WARNING
506762-01
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