Carrier GT-G User Manual

Also see for GT-PX: Technical guide

Contents

CarrierCarrier Indoor & Outdoor Split Geothermal Heat Pumps - Rev.: 08/10/0546Equipment SelectionThe installation of geothermal heat pump units and allassociated components, parts, and accessories whichmake up the installation shall be in accordance withthe regulations of ALL authorities having jurisdictionand MUST conform to all applicable codes. It is theresponsibility of the installing contractor to determineand comply with ALL applicable codes and regulations.GeneralProper indoor coil selection is critical to systemefficiency. Using an older-model coil can affectefficiency and may not provide the customer withrated or advertised EER and COP. Coil design andtechnology have dramatically improved operatingefficiency and capacity in the past 20 years.Homeowners using an older coil are not reapingthese cost savings and comfort benefits. NEVERMATCH AN R-22 INDOOR COIL WITH AN R-410ACOMPRESSOR SECTION.Newer indoor coils have a larger surface area,enhanced fin design, and grooved tubing. Thesefeatures provide a larger area for heat transfer,improving efficiency and expanding capacity. Typicalolder coils may only have one-third to one-half the facearea of these redesigned coils.Indoor Coil Selection - GT-PX (50YDS) Puron®Geothermal Split SystemGeothermal split system heat pumps are rated in theARI directory with a specific indoor coil match. GT-PX Puron split system (50YDS) models are rated withCarrier/Bryant FV4 or FE4 series variable speed airhandlers as shown in Table 1a. Other combinations(e.g. variable speed furnace with cased coil) may attainthe same ARI ratings providing that the specificationsmeet or exceed those listed in Table 1a AND Table1b. An ECM motor and TXV is required. Cap tubesand fixed orifices are not acceptable. PSC fans maybe used if matched to Table 1b, but will not meet ARIratings. If using PSC fan, compressor section must beoperated as a single stage unit (i.e. wired for either1st stage or 2nd stage). Without the ability to vary theairflow, supply air temperatures may not be acceptable ifthe compressor is allowed to change stages when usedwith a PSC fan motor.Table 1a: GT-PX (50YDS) Puron® Geothermal Split System Air Handler Matches for ARI RatingsCompressor Section 026 038 049 064Air HandlerModel FV4 or FE4 003 005 006 006Refrigerant R-410AMetering Device TXV (required)Air CoilTypeRows - Fins/in.Face Area (sq. ft.)Slope3 - 14.53.46A3 - 14.55.93A3 - 14.57.42A3 - 14.57.42Cabinet Configuration Upflow / Downflow / Horizontal (Multipoise)ECM Settings forARI Ratings(FV4 Fan Coil)AC/HP size: 036System Type:Comfort AC/HPCFM Adjust: NomAC/HP size: 036System Type:HP-Effic AC/HPCFM Adjust: HighAC/HP size: 048System Type:Comfort AC/HPCFM Adjust: HighAC/HP size: 060System Type:Comfort AC/HPCFM Adjust: HighFan Motor Type - HP ECM - 1/2 ECM - 1/2 ECM - 3/4 ECM - 3/4GT-PX Air Handler Matches for ARI Ratings