Trane SSC-APG002-EN User guide

Application Guide
SSC-APG002-EN
Low Outdoor Ambient Operation
UnitMounting
Minimum Clearances
Trane XR Style Outdoor Models
Trane XR Style Condensing Units and Heat Pumps

© Trane 2015Page 2 SSC-APG002-EN
ISSUEDBY:
ProductApplicationEngineeringDepartment
TraneacompanyofIngersollRand
Tyler,Texas
Thepurposeofthisbulletin is toprovideapplicationcriteriaas related totheTrane XR stylecondensing
unitsandheatpumpunits.
Thisbulletindiscusses:
I. Termsanddefinitions
II. Offseasoncoolingoperation
III. Compressorcrankcaseheatrequirements forsplitheatpump systems.
IV. Unitmounting
V. Minimumoperatingclearances
VI. Clearancefromvents
VII. Nameplateelectricaldata
POSITIONSTATEMENT:
Trane hasalwaysrecommendedinstallingTraneapproved,matchedindoorandoutdoor systems.
Thebenefitsofinstallingapprovedmatchedsytemsaremaximumefficiency,optimumperformance,and
bestoverallsystemreliability
WARNING – Indicates a potentially hazardous situation which, if not avoided,
could result in death or serious injury.
CAUTION – Indicates a potentially hazardous situation which, if not avoided,
may result in minor or moderate injury. It may also be used to alert against unsafe
practices.
CAUTION – Indicates a situation that may result in equipment or property-damage-
only accidents.
WarningsandCautionsmayappearthroughoutthismanual.Readthesecarefully.

© Trane 2015Page 3 SSC-APG002-EN
All 2.5 to 5 ton three phase split system cooling units and heat pumps are shipped from
the factory with compressor crankcase heat. Three phase compressor do not require
start capacitors or start relays.
CCHT - Compressor Crankcase Heater, sometimes called a compressor sump heater.
This device is designed to warm the compressor crankcase (or sump) in order to prevent
or deter refrigerant migration during the compressor off cycle. Compressor crankcase
heaters are required for low ambient cooling operation.
TXV - Thermostatic Expansion Valve. This is a type of refrigerant flow control device
designed to maintain constant superheat throughout the operating envelope. For low
ambient cooling applications, a non-bleed TXV is required.
Bleed TXV: This type of TXV will allow the refrigerant pressures between the high side
and low side to equalize through the valve during the off cycle.
Non Bleed TXV: This type of TXV will not allow the refrigerant pressures between the
high side and low side to equalize through the valve during the off cycle. When using this
type of valve on single phase units with reciprocating style compressors, compressor
start components are required. Check product data specifications for most current infor-
mation.
Head pressure controller -Adevice that is field installed on a condensing unit or heat
pump designed to maintain system head pressure that will allow safe system operation
without indoor coil icing in colder outdoor ambients. The BAYLOAM*** will cycle the
condenser fan motor in order to achieve adequate operating head pressure. The control
isadjustable.
Evaporator Defrost Control -Adevice that is field installed on the system’s indoor coil
in order to prevent the system from running during the cooling cycle when the indoor coil
approaches or reaches a temperature in which frost will form on the coil surface. When
the indoor coil approaches a safe temperature for cooling operation, the control will close
and allow the outdoor unit to restart. This controller makes and breaks the control volt-
age to the condensing unit.
Quick Start Component - This component may be factory installed or offered as a field
installed accessory ( BAYKSKT***). A quick start kit consist of a capacitor with a high
microfarad rating and a potential relay. It is installed so that the start capacitor is wired in
parallel with the compressor’s run capacitor. Prior to start-up the potential relay contacts
are closed, therefore placing the start capacitor in the compressor circuit, as the com-
pressor motor reaches operating speed, electrical current flows through the potential
relay’s coil and the the relay contacts are opened, thus taking the start capacitor out of
the system until the next compressor start up.
Definitions and information:
Three phase products:
Section I - Terms and Definitions:

Section II –Off Season Cooling Operation
Trane outdoor units may be operated in the cooling mode to 55°F outdoor ambient as shipped
from the factory when applied with an indoor TXV. Where required, these units with
appropriate accessories may be applied to operate at outdoor temperatures below 55°F.
Unit requires a compressor crankcase heater and start accessory only if it is not factory installed.
Compressor Crankcase Heaters:
Reciprocating Compressor: BAYCCHT300
Large Scroll Compressor: BAYCCHT301RES
Small Scroll Compressor: BAYCCHT302RES
As noted in the above table, systems may be operated lower than 55°F by applying the
BAYLOAM103 or BAYLOAM107 and other accessories. The BAYLOAM*** controller cycles
the outdoor fan motor as needed to maintain liquid line temperature as set by the DIP switches
located on the control. There is no need to change the outdoor motor on approved products since
the controller does not vary the frequency to the motor. However the BAYLOAM*** CANNOT
be applied to those model tonnages with a variable speed condenser fan motor.
55°F - 30°F 55°F - 30°F 55°F - 30°F 55°F - 30°F 30°F - 20°F or 30°F - 0°F see lowest approved OD ambient
Air
Conditioner
Heat Pump
55 deg F. As
Manufactured
Air
Conditioner
AY28X079 3
Heat Pump
AY28X084 3
TXV-NB CCHT
BAYLOAM103
BAYLOAM107
Start Kit
Solenoid
Valve (AC) 4
Windshield
Lowest Approved
Outdoor Ambient
Cooling Mode
13 SEER X X X X X BAYLOAM103 X X X Approved to 0 deg F
14 SEER X X X X X BAYLOAM103 X X X
AC Approved to 20 deg F
HP Approved to 10 deg F
15 SEER X X X X X BAYLOAM103 X X X
AC Approved to 20 deg F
HP Approved to 10 deg F
16 SEER 1, 2 X X X X X BAYLOAM107 1X X X
AC Approved to 20 deg F
HP Approved to 10 deg F
17 SEER X X X X X BAYLOAM103 X X X
AC Approved to 20 deg F
HP Approved to 10 deg F
Notes:
1 DO NOT apply BAYLOAM to model tonnages with variable speed condenser fan motors
2 Models with VS condenser fan motors are approved to 30 deg F with EDC or air handler with EEV
3 AY28X*** EDC not required when indoor unit has EEV
4 Liquid line solenoid shall be used for isolation purposes. Also used if liquid line is 1/2" and located before the evaporator coil if AC is above ID coil
See SS-APG006-EN Refrigeration Piping Application Guide
©Trane 2015 Page 4 SSC-APG002-EN

© Trane 2015Page 5 SSC-APG002-EN
Lowambientcoolingutilizing thefrostcontrolinGAM5AandTAM4 indoorunits:
TheTAM4andTAM7fancoilunitsutilizeanelectronicexpansionvalve(EEV).Withthisenhancementthe
controlsthatmonitortheEEValso allow us totakeadvantageofmonitoringcoil temperature.
How it works:
The on-board electronic controls include a relay that will open when the indoor coil begins to frost.
When this occurs, the contacts to the YO circuit will open and de-energize the outdoor unit, provided
figure 2 and 3 are followed. When the YO circuit opensthe outdoor unit is taken off line; however,
the indoor blower continues to operate, thus clearing the indoor coil of frost build-up.
Lowambientcooling utilizingthermostaticcontrolfound intheAY28X079andAY28X084.
How it works:
These controls are thermally controlled contacts with a capillary style sensor. The capillary tube is
inserted into the coil fins in between the tube rows. When the sensor detects 25F, the contacts open.
The contacts close when the coil temperature reaches 60F. When wired as shown in figures 4 and 5,
the outdoor unit is de-energized when the EDC contact opens and re-energizes when the EDC
contact closes.
Windshields:
Iflowambientcoolingoperation isrequired,windshieldsare a must inordertoblockprevailingwindsfrom
impactingsystemperformanceatlowoutdoor temperatures. Reference figure1.
UNIT
12" MIN.
2 1/2" MIN.
UNIT
12" MIN.
UNIT UNIT
SHIELD DESIGN FOR
HIGHLY DIRECTIONAL WINDS
SERVICE
ACCESS
AREA
SEE NOTES
SERVICE
ACCESS
AREA
SEE NOTES
SHIELD DESIGNED FOR
NON-DIRECTIONAL WINDS
REMOVEABLE PANEL
OR GATE
FOR SERVICE
PREVAILING
WIND DIRECTION
SHADOW BOX FENCE
33% MIN. FREE AREA
EACH SIDE
4" MINIMUM
24" MAXIMUM
2" MINIMUM
4" MAXIMUM
SOLID PANEL
Figure1-WindshieldConstructionInformation
NOTE:
National Electrical Code
requires minimum three
feet clearance from the
service panel. Some local
building departments will
allow a removeable panel
in front of the unit service
access area. Otherwise the
distance between the
windshield and the unit’s
service access is required
to be a minimum of three
feet. Reference page 16 of
this document for National
Electric Code information.

© Trane 2015Page 6 SSC-APG002-EN
Typical wiring the frost control located in TAM4 or TAM7 fan coil unit
Figure2
Coolingsplit system andTAM4 orTAM7fanCoilUnit
W
G
Y
X2
W
G
Y
O
R
B
BrownX2
Yellow
Orange
Red
Blue
Y
B
W3
W2
W1
BK (see note*)
G
Y2 (see note*)
YI (in)
YO(out
O
R
B
Figure3
Heatpump split system andTAM4 orTAM7fancoilunit
Thermostat
Thermostat
Heat pump
unit
GAM5 or TAM7 Air handling unit
Cooling
unit
Warning! Highvoltage presentin theoutdoorunitandindoorunit.Assure high
voltagepower isdisconnected usinglockout /tag-out proceduresif applicable
priorto connectinglowvoltagewiring.
R
B
*NOTE:
Y2 and BK is present
on TAM7 units and not
present on GAM5 or
TAM4.
W3
W2
W1
BK (see note*)
G
Y2 (see note*)
YI (in)
YO(out
O
R
B
GAM5 or TAM7 Air handling unit

© Trane 2015Page 7 SSC-APG002-EN
Typical wiring when using the evaporator defrost control (EDC):
Figure4 -
SingleSpeed Cooling SplitSystemandAY28X079EvaporatorDefrostControl
R
Y
G
W
B
Red (R)
Y
YLow
Orange
Green (G)
White(W1)
White(W2)
White(W3)
Blue (B)
R
Y
O
G
W
X2
B
Red
Yellow
Orange
Brown/X2
Blue
EDR-1
EDC
EDR
Y
B
Red (R)
Y
YLow
Green (G)
White(W1)
White(W2)
White(W3)
Blue (B)
EDC
Figure5 -
SingleSpeed Heat PumpSplit System andAY28X084EvaporatorDefrostControl
Thermostat
Air handling unit
Thermostat
Heat pump
unit
Air handling unit
Cooling
unit
Warning! Highvoltage presentin theoutdoorunitandindoorunit.Assure high
voltagepower isdisconnected usinglockout /tag-out proceduresif applicable
priorto connectinglowvoltagewiring.

© Trane 2015Page 8 SSC-APG002-EN
Drawingsforillustrationpurposesonly,
SectionIV-UnitMounting:
Thissectiondescribesappropriatemethodsformountingandsecuringtheunit.However,iftheseunitsaretobe
mountedinaregionwherehighwindsareanissue,aTraneBAYECMT***extremeconditionsmountingkit.may
beutilized. Otherwise,alocalP.E.andrestrainingmethodapprovedbytheauthorityhavingjurisdictionmaybe
required.Inregionswhereseizmicrestraintisarequirement, approvalfromalocalP.E.(professionalengineer)
mayberequiredfortherestraining method. (referencefigures7,8,and9for possible mountingconfiguration
examples)
A. FormountingorsecuringtheTranecondensingunitsandheatpumpspleaseobservethefollowing:
1. Iftheunitistobesupportedfromtheedge,thesupportingmaterialmustextendtwoinches
minimumundertheperimeteroftheunit’sbase.
2. Themountingholelocationsaremoldedinthebasepan,however,mustbedrilledthrough.
a)Holelocationsareidentifiedinfigures10and11.
3. Washersshouldbeplacedinbetweenthefastenerheadandthebasepan.
4. Tranerecommendssupportingthecenteroftheunitasshowninfigures9,10,and11.
5. Basesize3and4panshavefourmountingholes-seefigures10and11.
6. Forhurricaneorhighwindapplications,ifusingtheBAYECMT***kit, thebolthardnessanddiameter
isspecifiedintheBAYECMT***installationguide.
a)Boltlengthisdeterminedbytheauthorityhavingjursidictionand/orlocalP.E.
b)Mountingsurfacecompositionandweightshallbedeterminedbytheauthority havingjurisdictionand/
orlocalP.E.
c)Fornon-groundinstallations,refertoalocalP.E.
d)AlocalP.E.may berequired ifthe BAYECMT*** kitis usedor not.
Figure7 Figure9Figure8
Figure 6 -Climatic Zones for United States
Compressor crankcase heat is
required in Climatic Zones 1, 2,
and 3 for all heat pump
applcations. Refer to the unit
product data catalogue for
cranckase heater selection.
SectionIII - Compressor CrankcaseHeatRequirementsfor Split Heat Pumps:

© Trane 2015Page 9 SSC-APG002-EN
BASEPAN MOUNTINGHOLE LOCATIONS
(location only, holesmustbedrilled )
support must extend in 2” from the basepan perimeter
support center of unit
support must extend in 2” from the basepan perimeter
support center of unit
If supporting the base pan from the perimeter, the support must extend under the base pan at least 2”. Trane recommends
supporting the middle of the base pan with a cross member.
Drill
4 places
294 (11.56)
482 (18.99)
221 (8.69)
171 (6.74)
599 (23.58)
335 (13.19)
688 (27.08)
Drill
4 places
580 (22.85)
Figure 11 - Base 4
Figure 10 - Base 3 Measurements are provided
in MM and (Inches)
310(12.20)
158(6.24)
795(31.28)
717(28.24)
599(23.28)
727(28.64)
317(12.48)
213(8.39)
Drill
4 places
Drill
4 places

© Trane 2015Page 10 SSC-APG002-EN
Section V - Minimum Operating Clearances
Thissectiondiscussesinstallatingacondensingunit/heatpumpwherespacingislimited.Wheninstalling
Trane outdoorunitsina locationwhereclearanceto other units,walls,fences, etc. islimited, theconcerns
listedbelow must be addressed:
1.SystemOperation -Adequate airflow mustbe providedtoand awayfrom the condensingunit / heat
pumpinorderto enable appropriateheattransfer.If this isaccomplished,head pressure willremain
withinaneffectiveoperatingrange.
2.SystemServicability-Sufficientworkingspacemustbeallowedfor the HVAC servicetechnicianto
properlymaintainthecondensingunit/ heat pump.Furthermore,spacemustbeallowed for major
componentchangeout in theevent of afailure.Working spaceis determined bytheLocal, Stateand
NationalCodes. (See NationalElectric CodeTable110.26for explanation.)
3.Space Maintenance -Appropriate spacemust beallowed inorder to for personnel tomaintain the
groundareawherethe units arepositionedtoprohibitfoliage growth aroundtheunit(s)and debris
fromcollectingonthe panels.
3.State,Local Codes,andNational Codesshall prevail. Checkwith the localjurisdiction before
installationtoassurecompliance.
Manyprojectsrequireconsiderationofminimumclearancesbetween outdoor units andadjacentwalls,
fencesandotherunits.The obstructioninquestionisusuallyoneofthefollowing:
1.Oneor more wallsof an adjacentbuilding.
2.Fencesor barriers providedtoreduce sound transmissionorvisually screen theequipment.
3.Otheroutdoorunitsinamulti-unitinstallation.
4.Acombination ofthe above.
5.Overhangs
Theprimeconsiderationsinvolvedinestablishingminimumclearancesare:
1.Adequateairflowtotheoutdoor coilwithminimumrecirculation.
2.Service access to the equipment.
3.Compliancewith theNationalElectric Codeandother applicable codes.
4.Designtemperature- Design temperaturesgreaterthan105F require additionalconsideration.
I. Inorderto ensure adequate airflow reaches the condensingunit, sizefree airpassages at300 FeetPer
Minutemaximumvelocity. Seecondensingunitairflowperformanceonpage18ofthisdocument.
II. Theimportanceofprovidingproperservice access toequipmentcannotbe overemphasized. The
HVACservicetechnician’sjob maybe performed withgreater ease andlower cost ifadequate service
spaceisallowed.
III.Knowledge of the National ElectricCode andother applicable codes for thejob sitelocation isa
necessityinorder to satisfylocalinspectors.Thesecodesare inplacefor serviceability aswellas safety.
IV.Besureto read allprovisionsand footnotes containedinthis document.
V. WhereASHRAEdesigntemperaturesexceed105F,minimumoperatingclearancesmayincrease.