Equipment Selection; Air Coil Match-Ups - Carrier GT-PX Split Series Installation, Operation & Maintenance Instructions Manual

R e s i d e n t i a l S p l i t - 6 0 H z R 2 2 & R 4 1 0 A
R e v. : 5 J u n e , 2 0 0 8

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.
Table 1a: GT-PX Air Handler Matches for ARI Ratings
Compressor Section
Air Handler
Model FV4
Refrigerant
Metering Device
Air Coil
Type
Rows - Fins/in.
Face Area (sq. ft.)
Cabinet Confi gura-
tion
ECM Settings for
ARI Ratings
(FV4 Fan Coil)
Fan Motor Type - HP
6
026
003
Slope
3 - 14.5
3.46
Upfl ow/Downfl ow/Horizontal (Multipoise)
AC/HP size: 036 AC/HP size: 036
System Type:
Comfort AC/HP HP-Effi c AC/HP
CFM Adjust: Nom CFM Adjust: High
ECM - 1/2
W a t e r- S o u r c e H e a t i n g a n d C o o l i n g S y s t e m s
Indoor Coil Selection - GT-PX Split (50YDS)
Carrier Geothermal split system heat pumps are rated in
the ARI directory with a specifi c indoor coil match. GT-PX
Split (50YDS) models are rated with Carrier/Bryant FV4 or
FE4 series variable speed air handlers as shown in Table
1a. Other brands of air handlers 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.
038
005
R-410A
TXV (required)
A
3 - 14.5
5.93
AC/HP size: 048
System Type: System Type:
Comfort AC/HP
CFM Adjust: High
ECM - 1/2 ECM - 3/4
049
006
A
3 - 14.5 3 - 14.5
7.42 7.42
AC/HP size: 060
System Type:
Comfort AC/HP
CFM Adjust: High
ECM - 3/4
064
006
A