Application Guide - Trane XR Style Condensing Units and ...

1 Application GuideSSC-APG002-ENLow Outdoor Ambient OperationUnit MountingMinimum ClearancesTrane XR Style Outdoor ModelsTrane XR Style Condensing Units and heat PumpsSSC-APG002-EN Page 2 Trane 2011. All rights reservedISSUED BY:Product Application Engineering DepartmentTraneTyler, TexasThe purpose of this bulletin is to provide Application criteria as related to the Trane residential XR stylecondensing Units and heat pump bulletin and season cooling operating from electrical dataPOSITION STATEMENT: Trane has always recommended installing Trane approved, matched indoor and outdoor benefits of installing approved matched sytems are maximum efficiency, optimum performance, andbest overall system reliabilityWARNING Indicates a potentially hazardous situation which, if not avoided,could result in death or serious Indicates a potentially hazardous situation which, if not avoided,may result in minor or moderate injury.

2 It may also be used to alert against Indicates a situation that may result in equipment or property-damage-only and Cautions may appear throughout this manual. Read these Page 3 Trane 2011. All rights reservedCCHT - Compressor Crankcase Heater, sometimes called a compressor sump device is designed to warm the compressor crankcase (or sump) in order to preventor deter refrigerant migration during the compressor off cycle. Compressor crankcaseheaters are required for low ambient cooling - Thermostatic Expansion Valve. This is a type of refrigerant flow control devicedesigned to maintain constant superheat throughout the operating envelope.

3 For lowambient cooling applications, a non-bleed TXV is TXV: This type of TXV will allow the refrigerant pressures between the high sideand low side to equalize through the valve during the off Bleed TXV: This type of TXV will not allow the refrigerant pressures between thehigh side and low side to equalize through the valve during the off cycle. When using thistype of valve on single phase Units with reciprocating Style compressors, compressorstart components are required. Check product data specifications for most current pressure controller - A device that is field installed on a Condensing unit or heatpump designed to maintain system head pressure that will allow safe system operationwithout indoor coil icing in colder outdoor ambients.

4 The BAYLOAM103 will cycle thecondenser fan motor in order to achieve adequate operating head pressure. The controlis Defrost Control - A device that is field installed on the system s indoor coilin order to prevent the system from running during the cooling cycle when the indoor coilapproaches or reaches a temperature in which frost will form on the coil surface. Whenthe indoor coil approaches a safe temperature for cooling operation, the control will closeand allow the outdoor unit to restart. This controller makes and breaks the control volt-age to the Condensing Start Component - This component may be factory installed or offered as a fieldinstalled accessory ( BAYKSKT**).

5 A quick start kit consist of a capacitor with a highmicrofarad rating and a potential relay. It is installed so that the start capacitor is wired inparallel with the compressor s run capacitor. Prior to start-up the potential relay contactsare closed, therefore placing the start capacitor in the compressor circuit, as the com-pressor motor reaches operating speed, electrical current flows through the potentialrelay s coil and the the relay contacts are opened, thus taking the start capacitor out ofthe system until the next compressor start and information:Secion I - Terms and Definitions:SSC-APG002-EN Page 4 Trane 2011.

6 All rights reserved* Unit requires a compressorcrankcase heater and start acces-sory only if it is not factory general specificationslocated in product data to determineif unit is equipped with factoryinstalled quick start 1 - Required accessories for the XR13 and XR15 applied between 30F and 55F outdoor ambientModelFamily55 F45 F30 F4 TTR3 AsShippedTXV CCHT*AY28X079 TXV CCHT*4 TWR3 AsShippedTXV CCHT*AY28X084 TXV CCHT*4 TTR5-EAsShippedTXV CCHT*AY28X079 TXV CCHT*4 TWR5-EAsShippedTXV CCHT*AY28X084 TXV CCHT*The Trane XR models, as well as the 3 phase models may be operated in the cooling mode to 55oF asshipped from the factory when applied with an indoor TXV.

7 Where required, these Units , with appropriateaccessories, may be applied to operate at outdoor temperatures below refer to Table 1 or Table 2 below to determine if the desired model unit will operate at the specifiedconditions and required 2 - Required accessories for XR13 / XR15 Units applied in low outdoor ambient cooling operation below 30 FModel Family Approved for 0 F4 TTR3 BAYLOAM103 AY28X079 CCHT*Quick StartAccessorySolenoid Valve**4 TWR3 BAYLOAM103 AY28X084 CCHT*Quick StartAccessoryModel Family Approved for +20 F4 TTR5018 - 060 EBAYLOAM103 AY28X079 CCHT*Quick

8 StartAccessorySolenoid Valve**4 TWR / 4 TTR5049 ENOT APPROVED4 TWR / 4 TTR5061 ENOT APPROVED4 TWR5-EBAYLOAM103 AY28X084 CCHT*Quick StartAccessorySection III - Off Season Cooling Operation:AY28X079: Cooling onlyAY28X084: heat pumpsHead Pressure Controller:BAYLOAM103:Approved for heat pumps and cooling unitsEvaporator Defrost Control Kits (EDC):As noted in the above table, systems may be operated lower than 55OF, by applying the BAYLOAM103head pressure controller and other required accessories. The BAYLOAM103 controller cycles the outdoorfan as needed to maintain liquid line temperature as set by the DIP switches located on the control.

9 There isno need to change the outdoor fan motor on approved products since the controller does not vary thefrequency to the motor. For more information, publication number 18-HE46D1-1or latest version, shouldbe Information about low ambient controls:Compressor Crankcase Heaters:Reciprocating Compressor:BAYCCHT300 Large Scroll Compressor:BAYCCHT301 Small Scroll Compressor:BAYCCHT302* *Solenoid valve required if:1. Liquid line is one size larger thanfactory connection. (example:factory connection is 3/8 and theexisting liquid line is 1/2 ) Pleaserefer to publication SS-APG006-ENor latest edition for approved Off cycle time will be longer than30 minutes during low ambientcooling addition to the current head pressure control, Trane offers two types of EDC controllers.

10 One being thetraditional field ordered accessories and the other is on board controls in the GAM5 and TAM7 fan Page 5 Trane 2011. All rights reservedWindshields:If low ambient cooling operation is required, windshields are a must in order to block prevailing winds fromimpacting system performance at low outdoor temperatures. Reference figure " 1/2" " DESIGN FORHIGHLY DIRECTIONAL WINDSSERVICEACCESSAREASEE NOTESSERVICEACCESSAREASEE NOTESSHIELD DESIGNED FORNON-DIRECTIONAL WINDSREMOVEABLE PANELOR GATEFOR SERVICEPREVAILINGWIND DIRECTIONSHADOW BOX FENCE33% MIN.