Carrier Infinity Puron 19VS with Touch Control 24VNA9 Application Manualline page 5

Existing 1-stage indoor equipment
The 19VS will work with a 1-stage thermostat as a 1-stage system with suitable indoor
coil and fan until the indoor components can be upgraded to provide full variable speed
functionality.
If the indoor furnace coil was built in 2006 or after, it may be straight matched or one
size larger than the outdoor unit tonnage*. If the furnace coil was built between 2005
and 1992, the furnace coil may be straight matched, one or two sizes larger than the
outdoor unit tonnage*. A Puron
In existing fan coil applications, if the unit was built in 2006 or after, it may be straight
matched or one size larger than the outdoor unit tonnage*. If the fan coil was built
between 2005 and 1992, it may be straight matched, or one size larger tonnage than
the outdoor unit tonnage*. A Puron refrigerant TXV is required on the indoor coil.
Line set limitations
The 19VS is qualified for line sets up to 100ft. equivalent length
Lift limitations:
Outdoor above indoor: 100 ft.
Outdoor below indoor:
2 ton
80ft
See Product Data for line set diameter requirements
Sound
The 19VS uses a pressure equalizer valve (see Figure 3). It is designed to equalize
pressures across the rotary compressor in the off-cycle to ensure easier starting. During
the equalization process, a hissing sound may be heard by customers. This sound is
normal, but the customer should be made aware to avoid nuisance callbacks.
Figure 3. Pressure Equalizer Valve
*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 indoor coil.
3 ton 4 ton 5 ton
80ft 70ft 60ft
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