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

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.

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

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.

Typical wiring the frost control located in TAM4 or TAM7 fan coil unit

Figure2

Coolingsplit system andTAM4 orTAM7fanCoilUnit

BrownX2

Yellow

Orange

Red

Blue

BK (see note*)

Y2 (see note*)

YI (in)

YO(out

Figure3

Heatpump split system andTAM4 orTAM7fancoilunit

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.

*NOTE:

Y2 and BK is present

on TAM7 units and not

present on GAM5 or

TAM4.

BK (see note*)

Y2 (see note*)

YI (in)

YO(out

GAM5 or TAM7 Air handling unit

Typical wiring when using the evaporator defrost control (EDC):

Figure4 -

SingleSpeed Cooling SplitSystemandAY28X079EvaporatorDefrostControl

Red (R)

YLow

Orange

Green (G)

White(W1)

White(W2)

White(W3)

Blue (B)

Red

Yellow

Orange

Brown/X2

Blue

EDR-1

EDC

EDR

Red (R)

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.

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:

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

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.

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