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Carrier Indoor & Outdoor Split Geothermal Heat Pumps - Rev.: 08/10/05
46
Equipment Selection
The installation of geothermal heat pump units and all
associated components, parts, and accessories which
make up the installation shall be in accordance with
the regulations of ALL authorities having jurisdiction
and MUST conform to all applicable codes. It is the
responsibility of the installing contractor to determine
and comply with ALL applicable codes and regulations.
General
Proper indoor coil selection is critical to system
effi ciency. Using an older-model coil can affect
effi ciency and may not provide the customer with
rated or advertised EER and COP. Coil design and
technology have dramatically improved operating
effi ciency and capacity in the past 20 years.
Homeowners using an older coil are not reaping
these cost savings and comfort benefi ts. NEVER
MATCH AN R-22 INDOOR COIL WITH AN R-410A
COMPRESSOR SECTION.
Newer indoor coils have a larger surface area,
enhanced fi n design, and grooved tubing. These
features provide a larger area for heat transfer,
improving effi ciency and expanding capacity. Typical
older coils may only have one-third to one-half the face
area of these redesigned coils.
Indoor Coil Selection - GT-PX (50YDS) Puron®
Geothermal Split System
Geothermal split system heat pumps are rated in the
ARI directory with a specifi c indoor coil match. GT-
PX Puron split system (50YDS) models are rated with
Carrier/Bryant FV4 or FE4 series variable speed air
handlers as shown in Table 1a. Other combinations
(e.g. variable speed furnace with cased coil) may attain
the same ARI ratings providing that the specifi cations
meet or exceed those listed in Table 1a AND Table
1b. An ECM motor and TXV is required. Cap tubes
and fi xed orifi ces are not acceptable. PSC fans may
be used if matched to Table 1b, but will not meet ARI
ratings. If using PSC fan, compressor section must be
operated as a single stage unit (i.e. wired for either
1st stage or 2nd stage). Without the ability to vary the
airfl ow, supply air temperatures may not be acceptable if
the compressor is allowed to change stages when used
with a PSC fan motor.
Table 1a: GT-PX (50YDS) Puron® Geothermal Split System Air Handler Matches for ARI Ratings
Compressor Section 026 038 049 064
Air Handler
Model FV4 or FE4
003 005 006 006
Refrigerant R-410A
Metering Device TXV (required)
Air Coil
Type
Rows - Fins/in.
Face Area (sq. ft.)
Slope
3 - 14.5
3.46
A
3 - 14.5
5.93
A
3 - 14.5
7.42
A
3 - 14.5
7.42
Cabinet Confi guration
Upfl ow / Downfl ow / Horizontal (Multipoise)
ECM Settings for
ARI Ratings
(FV4 Fan Coil)
AC/HP size: 036
System Type:
Comfort AC/HP
CFM Adjust: Nom
AC/HP size: 036
System Type:
HP-Effi c AC/HP
CFM Adjust: High
AC/HP size: 048
System Type:
Comfort AC/HP
CFM Adjust: High
AC/HP size: 060
System Type:
Comfort AC/HP
CFM Adjust: High
Fan Motor Type - HP ECM - 1/2 ECM - 1/2 ECM - 3/4 ECM - 3/4
GT-PX Air Handler Matches for ARI Ratings