Carrier Infinity Puron 19VS with Touch Control 24VNA9 Application Manualline page 4

For existing furnace applications, the furnace must have a suitable blower size.
Furnace coils built in 2006 or newer can be straight matched to the outdoor unit
tonnage or one size larger*. A Puron
coil. Furnace coils built between 2005 and 1992 may be straight matched, one or
two tonnage sizes larger than the outdoor unit tonnage*. A Puron refrigerant TXV
must be added to the indoor coil.
Existing 2-stage indoor equipment
The 19VS is capable of operating with a standard 2-stage thermostat and non-
communicating 2-stage indoor equipment. In this case, the outdoor unit will be
wired as a 2-stage system, and will operate as a 2-stage system. Combination
ratings will be available with some furnace/coil and FV4C fan coil combinations.
These ratings will apply to both new and existing equipment of like model
numbers.
An older FV4(A,B) of like size may be used. Unlike the 18VS heat pump, the
model plug in the outdoor unit does not need to be changed in straight-cool
applications.
An older FK or 40FK fan coil may be used with the addition of a Puron refrigerant
TXV. The model plug in the outdoor unit does not need to be changed in straight-
cool applications
For existing furnace applications with the 19VS, the furnace must have a suitable
blower size and staging capability. Furnace coils built in 2006 or newer may be
straight matched to the outdoor unit tonnage or one size larger*. A Puron
refrigerant TXV is required on the furnace coil. Furnace coils built between 2005
and 1992 may be straight matched, one or two sizes larger than the outdoor unit
tonnage*. A Puron refrigerant TXV must be added to the indoor coil.
* Examples

Straight matched to outdoor unit tonnage – 3-ton 19VS unit with 3-ton furnace or fan coil

One size larger indoor – 3-ton 19VS with 3.5 ton furnace or fan coil

2 sizes larger indoor – 3-ton 19VS with older 4 ton furnace coil
®
refrigerant TXV is required on the furnace
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