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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
6
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
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 ef
fi
ciency.
Using an older-model coil can affect ef
fi
ciency and may
not provide the customer with rated or advertised EER
and COP. Coil design and technology have dramatically
improved operating ef
fi
ciency and capacity in the past 20
years. Homeowners using an older coil are not reaping these
cost savings and comfort bene
fi
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 ef
fi
ciency and expanding
capacity. Typical older coils may only have one-third to one-
half the face area of these redesigned coils.
Equipment Selection
Indoor Coil Selection - GT-PX Split (50YDS)
Carrier Geothermal split system heat pumps are rated in
the ARI directory with a speci
fi
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 speci
fi
cations meet or exceed
those listed in Table 1a AND Table 1b. An ECM motor
and TXV is required. Cap tubes and
fi
xed ori
fi
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
air
fl
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 Air Handler Matches for ARI Ratings
Compressor Section
026
038
049
064
Air Handler
Model FV4
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 Con
fi
gura-
tion
Up
fl
ow/Down
fl
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-Ef
fi
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