Carrier GZ024 Installation Instructions Manual

Carrier GZ024 Installation Instructions Manual Manual pdf 7 page image

7MATCHED SYSTEMThe GZ geothermal splits have been tested and rated with Carrier& Bryant air handlers (fan coils) and evaporator coils (for use withfurnaces).Use air handler or cased coil from the list below and follow theInstallation Instructions for those components.Geothermal and Air Handler or Cased Coil Match--- UpGeothermal Split Air Handler Cased CoilGZ024 F(E/V)4***003,FB*024 C(A/N)P(V/M)P2417GZ036 F(E/V)4***003,F(E/V)4***005 C(A/N)P(V/M)P3617GZ048 F(E/V)4***005 C(A/N)P(V/M)P4821GZ060 F(E/V)4***006 C(A/N)P(V/M)P6024GZ072 F(E/V)4***006 C(A/N)P(V/M)P6024When using the GZ unit with a furnace, it is important to match theCFM output of the furnace to the requirements of the GHP. For theGZ072, the selected furnace must achieve at least 2200 CFM.NOTE: The Infinity/Evolution Control may not prevent thesystem from accepting a furnace with less airflow than required forthe GZ072. This is the responsibility of the installer.REFRIGERANT LINES! WARNINGPERSONAL INJURY / ENVIRONMENTAL HAZARDFailure to follow this warning could result in personal injuryor death.Relieve pressure and recover all refrigerant before systemrepair or final unit disposal.Use all service ports and open all flow–control devices,including solenoid valves.CAUTION!ENVIRONMENTAL HAZARDFailure to follow this caution may result in environmentaldamage.Federal regulations require that you do not vent refrigerant tothe atmosphere. Recover during system repair or final unitdisposal.The installation of the copper refrigerant tubing must be done withcare to obtain reliable, trouble free operation. This installationshould only be performed by qualified refrigeration service andinstallation personnel.Refrigerant lines should be routed and supported so as to preventthe transmission of vibrations into the building structure. 75 feet asthe maximum length of interconnecting refrigerant lines in splitsystem heat pumps. Beyond 75 feet, system losses becomesubstantial and the total refrigerant charge required cancompromise the reliability and design life of the equipment.Refrigerant lines should be sized in accordance with those listed inTable 3. Copper tubing must be clean and free of moisture and dirtor debris. The suction and liquid lines should be insulated with atleast 3/8” wall, closed--cell foam rubber insulation or equivalent.Table 3 – Valve Sizing ChartValve Sizing ChartUnit Size Line Type Valve Conn.SizeAllen WrenchSizeGZ024, 036 Suction 3/4 5/16GZ048, 060, 072 Suction 7/8 5/16All Valves Liquid 3/8 5/16Some points to consider are:S Pressure drop (friction losses) in refrigerant suction lines reducessystem capacity and increases power consumption by as much as2% or more, depending on the line length, number of bends, etc.Pressure drop in liquid lines affects system performance to a lesserdegree, provided that a solid column of liquid (no flash gas) isbeing delivered to the refrigerant metering device, and that theliquid pressure at the refrigerant metering device is sufficient toproduce the required refrigerant flow.S Oil is continually being circulated with the refrigerant so, oilreturn to the compressor is always a consideration in line sizing.Suction lines on split system heat pumps are also hot gas lines inthe heating mode, but are treated as suction lines for sizingpurposes. If the recommended suction lines sizes are used, thereshould be no problem with oil return.S Vertical lines should be kept to a minimum. Vertical liquid lineswill have a vertical liquid lift in either heating or cooling, and theweight of the liquid head is added to the friction loss to arrive atthe total line pressure drop.S Wherever possible, the air handler should be installed at a higherelevation than the condensing section to aid with oil return to thecompressor.Linear vs Equivalent Line LengthLinear Line Length -- is the actual measured length of the lineincluding bends. This is used to calculate the additional refrigerantcharge that must be added to the system.Equivalent Line Length -- is the combination of the actual lengthof all the straight runs and the equivalent length of all bends valvesand fittings in a particular line. The equivalent length of a bend,valve or fitting is equal to the length of a straight tube of the samediameter having the same pressure drop as the particular valve orfitting. The ASHRAE Fundamentals Handbook provides tables fordetermining the equivalent length of various bends, valves andfittings.Connecting Refrigerant LinesS Use only ACR grade copper tubing and keep ends sealed untiljoints are made.S For best performance, select routing of refrigerant lines forminimum distance and least number of bends.S Size lines in accordance with Table 5.S Cut crimped ends off the air handler suction and liquid lines.Connect and braze lines to the air handler.NOTE: The air handler is factory supplied with a holding chargeof dry nitrogen.S Connect and braze lines to service valves on the condensingsection.CAUTION!UNIT DAMAGE HAZARDFailure to follow this caution may result in equipmentdamage or improper operation.S Use a brazing shieldS Wrap service valves with wet cloth or heat sink material.S Direct flame away from the valve body.S Valve body temperature must remain below 250_F toprotect the internal rubber “O” rings and seals.S Use nitrogen purge while brazing.Pressurize the refrigerant lineset and air handler to 150 lbs with drynitrogen through the ports provided on the self service valves.Check lineset and unit connections for leaks. Once system integrityis verified, evacuate lineset and air handler with a good vacuumpump to 500 microns and hold for half hour.IMPORTANT: Pumpdown must never be used with heatpumps.