American Standard Allegiance 18 User guide

Application Guide
ALG18-APG01-EN
American Standard Allegiance and Heritage 18
dual compressor cooling units and heat pumps
Low Outdoor Operating Temperature
UnitMounting
MinimumClearances
RefrigerantPipingLimitations
American StandardAllegiance / Heritage 18

ThepurposeofthisbulletinistoprovidecumulativeapplicationcriteriaasrelatedtotheAmericanStandard
Allegiance/Heritage18coolingunitsandheatpumps.
Thisbulletindiscusses:
I. OffSeasonCoolingOperation
II. UnitMounting
III. MinimumOperatingClearances
IV. RefrigerantPipingLimitations
ISSUEDBY:
ProductTrainingandApplicationDepartment
AmericanStandard
Tyler,Texas Pg. 2

Section I - Off Season Cooling Operation
TheAmerican StandardAllegiance / Heritage18 maybe operated inthe coolingmode to45oFas shipped
fromthe factory.These units shallonlybematchedwithvariablespeedairhandlingunitsorvariablespeed
furnace/coilcombinations.Thecoilshavefactorysuppliednon-bleedTXV’s
Pleaserefertotheaccessorytablebelowwhendeterminingif the unit will operate at thespecified
conditionsaswellasrequiredaccessories.
ERUTAREPMETDO@SEIROSSECCADERIUQER
ledoM54
0
F04/03
0
F0
0
F
81ecnaigellA deppihSsACDE toN devorppA
81egatireH deppihSsACDE toN devorppA
EvaporatorDefrostControlKits (EDC)
Pg.3
AY28X079-Coolingonly
AY28X084 -Heat pumps
CompressorCrankcase HeaterKit- BAYCCHT
CompressorHardStart Kits- BAYKSKT
Allegiance/Heritage18’sare factorysuppliedwith compressor start components.
Allegiance/Heritage18’sare factorysuppliedwith compressor crankcase heat
Windshields
Windshieldsmayberequired,pleaserefertopage14ofthisdocumentfor information reagarding the
installationofwindbarriers.

Typical wiring when usingtheevaporator defrost control (EDC)foroperation as specified on page3.
CoolingSplitSystemandAY28X079EvaporatorDefrostControl
R
Y1
Y2
G
W
W2
B
Red (R)
Y
YLow
Green (G)
White(W1)
White(W2)
White(W3)
Blue (B)
Orange(O)
R
Y2
Y1
G
W1
X2
B
O
EDR-1
EDC
EDR
Y1
Red (R)
Ylow
Green (G)
White(W1)
White(W2)
White(W3)
Blue (B)
EDC
HeatPumpSplitSystem andAY28X084EvaporatorDefrostControl
2A7A8 TWE-E Thermostat
ASYSTAT302C
TWE-E
Pg.4
B
R
Y
Y
Red
Yellow/Red
Yellow
X2
Blue
Orange
Thermostat
ASYSTAT500C
2A6H8

SECTIONII- UnitMounting:
Thissection describes appropriate methods for mounting and securing theAllegiance/Heritage18,
however,ifthese units are tobe mounted ina region where seizmicloads or high windsare an issue, please
refertotheAmericanStandardBAYECMT001extremeconditionsmountingkitinstallationinstructions
publicationNumber#18-HE44D1-*(* latest verstion )
WhenmountingorsecuringAmericanStandard1 -6 ton condensing units andheat pumps please observe
thefollowing.
1. Anytimethe unitistobesupportedfromthe edge,thesupportingmaterialshallextendminimum two
inchesundertheperimeteroftheunit’sbase.
2. The mounting hole locations are molded inthebasepan,however,theymustbedrilledthrough.
a)Holelocationsare identified on page6.
b)Holediameter is 5/16”
3. Washers should beplaced inbetweenthe fastener headandthe basepan.
4. American Standardrecommendssupportingthecenteroftheunit.
5. Base 4 pans have four mounting holes.
Referto the dimensiontablesforactualunitsize.
Pleaserefertothefollowingillustrationsfordimensionsandgeneralinformation.
Drawingforillustrationpurposesonly.
Pg.5

BASEPAN MOUNTINGHOLE LOCATIONS
(location only, holesmust bedrilled )
support must extend 2” from the basepan perimeter
If supporting the base pan from the perimeter, the support must extend under the base pan at least 2”. American
Standard recommends supporting the middle of the base pan with a cross member.
Pg. 6
support center of unit
Drill 4 places
Drill 4 places

Section III - Minimum Operating Clearances
Thissection discusses applying a condensingunit/heatpumpininstallationswheretherearespace
constraints.
Theseconcernsmust be addressed:
1.SystemOperation - Adequateairflow must beprovided tothe condensing unit/ heatpump in order
toenable appropriate heat transfer.Ifthisisaccomplished,headpressurewill remain within an effective
operatingrange.
2.SystemServicability - Proper spacemust be allowedfor theHVACservice technician toproperly
maintainthecondensingunit/heatpump.Furthermore,spacemustbeallowedformajor
componentchangeoutintheeventofafailure.Working space is determined by the National Electric
Code
3.Space Maintenance -Appropriatearea must beallowed inorder maintainthe groundarea wherethe
unitsare positioned toprohibitdebrisfromcollectingonthepanels,thus further providingunobstructed
airflowtothecondensingunit.
4.State,Local Codes, andNational Codesshall prevail. Checkwith the localjurisdiction before
installationtoassurecompliance.
Numerousprojectsrequire reduced clearancesbetween outdoor unitsand adjacentwalls, fences andother
units.Theobstructioninquestionisusuallyoneofthefollowing:
1.Oneormore walls ofan adjacent building.
2.Fencesorbarriersprovided to reduce soundtransmission or visually screenthe equipment.
3.Otheroutdoorunitsinamulti-unitinstallation.
4.Overhangs
5.Acombination of theabove.
Theprimeconsiderationsinvolvedinestablishingminimumclearancesare:
1.Adequateairflowtotheoutdoorcoilwithminimumrecirculation.
2.Service access tothe equipment.
3.Compliancewiththe National ElectricCode and otherapplicable codes.
4.Designtemperature-Designtemperaturesgreaterthan 105F require additional consideration.
I.Inorderto assure thatadequate airflow reachestheAllegiance18 condensing unit, sizefree air passages
at300feetperminutemaximumvelocity(FPM).Seecondensingunitairflowperformanceonpage16of
thisdocument; or,forthe most current information, consulttheunit’sproductdatamanual.
II.Theimportanceof providing sufficientaccess for maintenance and service to equipment cannotbe
overemphasized.The HVACservice technician’s job may beperformed with greaterease and atlower cost
ifadequatespace is allowed.
III.Knowledgeof the NationalElectric Codeand otherapplicable codes forthe jobsight locationis a
necessityinorder to satisfylocal inspectors.These codes are inplace forservice as wellas safety.
IV.Besuretoreadall provisions and footnotes containedinthis document.When ambient temperatures
exceed105F, morespace may be requiredfor minimum operating clearances.
Pg. 7

1. Installationof asingleAllegiance/ Heritage18 condensingunit/heatpump ina cornerwith
unrestricted topclearance.
A) Forlocationswherethedesignambient temperature is below 105F:
1)1.0 feetclearance on2 sides -If shrubbery isto be placedby the unitotherside, thenallow1.0
Feetminimumclearancefromtheunit
2)Serviceaccesssideminimum3’.ConsultLocal,State,andNationalElectricCodesforminimum
serviceclearance.
B) Forlocations wherethe design ambient temperatureexceeds105F:
1)1.5 feet clearanceon 2 walls.-If shrubberyis tobe placed bythe unitother side, thenallow1.0
Feetminimumclearancefromtheunit.
2)Service access side minimum 3’
C) If unit is located in such a way that service panel is facing the wall
1)NECrequiresminimum3feetbetweentheunitandthewall
a)This spacemay beincreased to3 1/2 feet.Consult the NationalElectric Codefor more
informationregardingminimumclearancesforworkingspaces.
2. Installationof twoormoreAllegiance /Heritage18unitswheretwo adjacentwallsforma
cornerandunrestrictedtopclearance.
A) Forlocationswherethedesignambient temperature is below 105F:
1)Cornerunitshall have1.5 feetclearance from side walland 1.0 feetclearance from backwall.
2)1feet clearance in betweenunits, unless servicepanels face eachother.(ifservice panels face
each other, this clearance may be increased to 4 feet per NEC)
B) Forlocations wherethedesign ambienttemperatureexceeds 105F:
1)2.0feet clearance fromboth walls.
2)2feet clearance in betweenunits, unless servicepanels face eachother.(ifservice panels face
each other, this clearance may be increased to 4 feet per NEC)
C) If unit’sarelocated in such a waythatthe service panels arefacingthe wall
1)NECrequiresminimum3feetbetweentheunitandthewall
a)Thisspace maybe increasedto 3 1/2feet. Consultthe most currenteditionof the National
ElectricCodeformoreinformationregardingminimumclearancesforworkingspaces.
SERVICE ACCESS PANEL SIDE 3’ minimum clearance
Service Panel
-1.0’-
min
-1.0’-
min
-1.0’-
min
-1.0’-
min
-1.0’-
min
-1.5’-
min -1.0’- min -1.0’-
min
Pg. 8
-1.0’-
min
3.0’ min 5feet minimum unrestricted top
clearanceshall be provided.
5feet minimum unrestricted top
clearanceshall be provided.

3. SingleAllegiance/ Heritage18condensing unit/ heatpumpinafenced cornerwith
unrestrictedtopclearance
A) Forlocationswherethedesignambient temperature is below 105F:
1)1.0feet clearance fromboth walls.
2)1.0 feet fenceclearance -openingsshall be providedtoallow free airpassageto unit. (Freeair
passageshall be sized@ 300FPMVelocity)
3)Serviceaccessshallbe3.0feetminimum
B) Forlocations wherethe design ambient temperatureexceeds105F:
1)1.5feet clearance fromboth walls.
3)1.5 feet clearancefrom fence. openingsshall beprovided toallow freeair passageto unit.( Free
airpassageshallbe sized @ amaximum of 300 FPMVelocity)
2)Serviceaccessshallbe3.0feetminimum.
C) If unit is located in such a way that service panel is facing the wall
1)NECrequiresminimum3feetbetweentheunitandthewall
a)This spacemaybe increasedto3 1/2feet.Consult theNationalElectric Codefor more
informationregardingminimumclearancesforworkingspaces.
*Service Panel
*Service Panel
-1.0’-
min
-1.0’-
min
-1.0’-
min
-1.0’-
min
1234
1234
1234
1234
12
12
12
12
12
12
12
12
12
12345
12345
12345
1
234
5
12345
12
12
12
12
12
12
12
12
12
-1.0’-
min
-3.0’-
min -1.0’-
min
-3.0’-
min
123
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
123
SIngle Unit - Solid Fence
Solid Fence: Fence height not to exceed top of unit. Provide openings in fence that will allow maximum 300 FPM air velocity.
These openings shall be located at the lower portion of the fence. If acceptable, the lower portion of the fence may be cut to
provide open bottom clearance provided that debris, grass and vegetation will not obstruct air passageway.
* If removable panels are used and acceptable to local inspection agency, the clearance to the removable
panel may be reduced to 2.0 feet
1234567
1
23456
7
1234567
opening size @
300FPMmaximum
velocity
Pg 9
5’ minimum top clearance required.
Unit shall be positioned where not affected
by water run off from roof.

1234
1
23
4
1
23
4
1
23
4
1
23
4
1
23
4
1
23
4
1
23
4
1
23
4
1
23
4
1
23
4
1
23
4
1
23
4
1
23
4
1
23
4
1
23
4
1
23
4
1
23
4
1
23
4
1
23
4
1234
MultipleUnits Solid Fence
* If removable panels are used and acceptable to local inspection agency, the clearance to the
removable panel may be reduced to 2.0 feet
1234567
1234567
123456
123456
opening size @
300FPMmaximum
velocity
SERVICE ACCESS PANEL SIDE*
-1.5’-
min
-1.5’-
min
-1.5’-
min
-1.5’-
min -1.5’-
min -1.5’-
min
5. Installationof twoormoreAllegiance /Heritage18unitswheretwo adjacentwallsforma
fencedcornerwith unobstructedtop clearance.
A) Forlocations where thedesignambient temperatureis below105F:
1)Cornerunitshall have1.5 feet clearancefrom one wall and1.0 feet clearancefrom the other wall.
2)1.5feet clearance inbetween units.
3)NEC requires 3feet clearancefor service.Thismay be reducedto 2.0feetif removable panels
areused.
4)Freeair passage shall becut inorder to allowmaximum 300 FPMair velocity
B) Forlocations wherethedesign ambienttemperatureexceeds 105F:
1)Cornerunit shall have2.0 feet clearancefrom one walland 1.5feet clearance fromthe other
wall.
2)2.0feet clearance inbetween units.
3)NEC requires 3feet clearancefor service.Thismay be reducedto 2.5feetif removable panels
areused.
C) If unit’s are located in such a way that the service panels are facing the wall
1)NECrequiresminimum3.0feetbetweentheunitandthewall
a)Thisspace maybe increasedto 3 1/2feet. Consultthe most currenteditionof the National
ElectricCodeformoreinformationregardingminimumclearancesforworkingspaces.
Solid Fence: Fence height not to exceed top of unit. Provide openings in fence that will allow maximum 300 FPM air velocity. These
openings shall be located at the lower portion of the fence. If acceptable, the lower portion of the fence may be cut to provide open
bottom clearance provided that debris, grass and vegetation will not obstruct air passageway.
-3.0’-
min
-3.0’-
min
-3.0’-
min
-1.5’-
min
1234
1234
12345
12345
12345
12345
12
12
12
12
12
12
12
12
12
Pg10
5’ minimum top clearance required.*
Unit shall be positioned where not affected by water run off from roof.
*For best performance, it is recommended to not construct cover over the unit’s in this type of multiple unit application.

6. Installationofa singleAllegiance /Heritage18 stylecondensing unit/heat pumpnext to one
wallwithunrestrictedtopclearance.
A) Forlocationswherethedesignambient temperature is below 105F:
1)6” clearanceon 1 side.
2)3’ clearance onotherthree sides.
3)If fence orbarrier isconstructed aroundunit, 3’clearanceis requiredon threesides.Thefence /
barrierheight shallnotexceedtheheightoftheunit.
4)Freeair passage shall becut inorder to allowmaximum 300 FPMair velocity iffence / barrieris
constructed.
5)Service access side minimum 3’
C) If unit is located in such a way that service panel is facing the wall
1)NECrequiresminimum3feetbetweentheunitandthewall
a)This spacemay beincreased to3 1/2 feet.Consult the NationalElectric Codefor more
informationregardingminimumclearancesforworkingspaces.
Service Panel
-3.0’-
min
5feet minimum unrestricted top
clearanceshall be provided.
3 feet minimum clearance on 3 sides.
Unitto be positioned where not
affectedbyroofrunoffwater.
-6.0”
min
Pg11
-3.0’-
min
-6.0”
min
-3.0’-
min
-3.0’-
min
123456789012345
1
2345678901234
5
123456789012345
123
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
123
12
12
12
12
12
12
12
12
12
12
12
12
Service Panel 5feet minimum unrestricted top
clearanceshall be provided.
3 feet minimum clearance on 3 sides.
Unitto be positioned where not
affected by roof run offwater.
Louvers / Free area shall be cut in
fence/barriertoprovidemaximum
300FPMair velocity.Lowerportion of
fence / barrier may be undercut to
allowfreeairpassagetounit providing
thatvegetationand debriswill not
block air passage.
-3.0’-
min
-3.0’-
min

4. Installationof multipleunitsona padorrooftopwithunobstructedtop clearance.
A)Refertodrawingforminimumclearances.
1)Donotconstructcoveroverunitsin this application.
B)NationalElectricCoderequires3feetminimum(4feetifcertainconditionsarepresent)clearance
betweenserviceaccess panel andadjacent unit.Ifserviceaccess panel facesthe wall,the required
spacebetweenthethe wall andthe unit shallbe minimum 3feet. (May requireas much as 31/2 feet)
C)Wallsshallnotbehigherthantopof units.
D)National, State, andLocal Codes mustbe observed.
1.0’
min**
1.0’
min**
1.0’
min**
1.0’
min**
1.0’
min**
1.0’
min** 1.5’
min 1.5’
min
1.5’
min
1.5’
min 1.5’
min
1.5’
min
-3.0’-
min
-3.0’-
min
3.0’
min
3.0’
min
-3.0’-
min
3.0’
min
Service Access * Service Access *
Service Access * Service Access * Service Access *
* Units may be rotated, as shown on the following page, in order that service access sides
face each other provided that 3 feet minimum clearance be maintained between the units.
In order to comply with NEC, this may increase to 4 feet minimum clearance.
** If wall or fence is to be constructed around the entire perimeter of the
mechanical yard, Maintain minimum 1.5 feet clearance from the units. The fence height
shall not exceed that of the unit. It is recommended to install louvers in the fence to allow
no greater than 300 feet per minute velocity. Consult the table on page 18 for unit airflow.
Place louvers in the lower section of the fence by each unit in order to provide air access to
each unit located by the fence. The lower portion of the fence may also be cut in order to
equal the calculated free area.
Pg. 12
Service Access *
Service Access * Service Access * Service Access *
3.0’
min
3.0’
min
3.0’
min
Clearances apply to geographical
areas where the design outdoor dry
bulb = 105 F or less

4. Installationof multipleunits onapad orrooftopwherethetopclearanceis open.
A)Refertominimumclearancetableinthelowercorner of this page for requiredclearances
B)NationalElectricCoderequires3feetminimum(4feetifcertainconditionsarepresent)clearance
betweenserviceaccess panel andadjacent unit.Ifserviceaccess panel facesthe wall,the required
spacebetweenthewall and theunit shall be minimum3 feet. (Mayrequire as muchas 3 1/2 feet)
C)Walls / Fence height shallnotbehigher than top of units.
D)National, State, andLocal Codes mustbe observed.
1.0’
min**
1.0’
min**
1.0’
min**
1.0’
min**
1.0’
min**
1.0’
min** 1.5’
min 1.5’
min
1.5’
min
1.5’
min 1.5’
min
1.5’
min
-3.0’-
min
-3.0’-
min
1.5’
min
1.5
min
-3.0’-
min
1.5
min
Service Access * Service Access * Service Access *
Service Access * Service Access * Service Access *
Service Access * Service Access * Service Access *
* Units may be rotated as shown on above, in order that service access sides face each other
provided that 3 feet minimum clearance be maintained between the units. In order to
comply with NEC, this may increase to 4 feet minimum clearance.
** If wall or fence is to be constructed around the entire perimeter of the mechanical yard,
Maintain minimum 1.5 feet clearance from the units. The fence height shall not exceed
that of the unit. It is recommended to install louvers in the fence to allow no greater than
300 feet per minute velocity. Consult the table on page 18 for unit airflow. Place louvers in
the lower section of the fence by each unit in order to provide air access to each unit
located by the fence. The lower portion of the fence may also be cut in order to equal the
calculated free area.
Pg. 13
Clearances apply to geographical
areas where the design outdoor dry
bulb = 105 F or less

66
22-3237-02
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
Notes:
• Service access working clearance (3 feet) for electrical and refrigerant components must meet NEC Article 110-16
requirements and local codes.
Note:
Minimum working clearance must be in compliance with the National Electric Code. Currently,
the minimum clearance between a wood or suitable grounding material type fence requires
minimum 3 feet. If other material is used to form the windshield, the minimum space may be
increased to 3.5 feet. Please consult the 2002 or current Edition of the National Electric Code,
Article 110 for the most up to date information
D) Fence construction.
1)Heightshallnotexceed the top ofthe unit.
2)Free air passagesshallbe size atnogreater than 300 FPMvelocity.
3)Free air passagesshallbe cutat thelower portionofthe fence.
4)Fencemay also beundercut to allowfree airpassage provided grass,vegetation, ordebris will
notobstruct the freeair passage.
5)Shrubberyshallnotbe planted within onefoot of the fence.
6)Ifremovable panel is utilized, the distance from the unit’sservicepaneltotheremovablepanel
maybereduced to 2.0feet. (3.0feet if geographicallocation’sdesignoutdoor dry bulbis greater
than 1050F.
E) Windshields:
Iflowambientoperationto 30F or lower isrequired, windshields may berequired to block prevailing
winds fromimpacting system performance at low outdoor temperatures.
Pg14
1.5’ 1.5’
Shadow Box Fence shall
not exceed unit’s top
height unless lower
potion is undercut
1.5’ 1.5’

ElectricalCodeInformation
CompliancewithLocal,State,and National Codes isa must on everyHVACInstallation.Thispage
discussesthe criteria regarding minimum working spaces as defined in the 2002 National Electric Code.
Themain concern is the safety oftheHVAC service/maintenanceperson.Minimumworkingclearances
arespecifiedin the NationalElectric Code(NEC)Article110.26
Forelectricalequipmentthatfrom ground to powerthe voltage is 600volts or less:
TheNational Electric Code specifically states that serviceareaaroundelectricalequipmentshallprovide
sufficientaccess,andshallbeproperlymaintainedin order to permit safe operation and maintenance of the
equipment.Table 110.26aswell as the figuresbesidethe table describe theminimum clearance for proper
serviceandaccesstoelectricalequipment.
AmericanStandard residentialand light commercial condensing unitsrangingfrom1to6tonrequireaccess
totheside service panelas indicatedon the previouspages togain access tothe electricalcontrols.
Condition 1
(3 ft min. for 151 - 600 V)
Condition 2
(Space would increase to 3 1/2 ft for 151 - 600 V)
Condition 3
(Space would increase to 4 ft for 151 - 600 V)
Minimum Clear Distance
Condition 1 Condition 2 Condition 3
Nominal
Voltage to
Ground
0-150 900 mm (3 FT) 900 mm (3 FT) 900 mm (3FT)
151-600 900 mm (3FT) 1 M (3.5FT) 1.2 mm (4FT)
Note: Where the conditions are as follows
Condition 1 - Exposed live parts on one side and no live or grounded parts
on the other side of the working space, or exposed live parts on both sides
effectively guarded by suitable wood or other insulating materials. Insulated
wire or insulated busbars operating at not over 300 volts to ground shall not
be considered live parts
Condition 2 - Exposed live parts on one side and grounded parts on the
other side. Concrete, brick, or tile walls shall be considered as grounded.
Condition 3 - Exposed live parts on both sides of the work space (not
guarded as provided in Condition 1) with the operator between.
Table 110.26(A)(1) Working Clearances
The table and figure below are excerpts from the National Electric Code 2002:
Pg. 15
Reprintedwithpermission from NFPA70-2002,NationalElectricalCode®, Copyright © 2001, National Fire
Protection Association. This reprinted material is not the complete and official position of the NFPA on the
referenced subject, which is represented only by the standard of it’s entirety.
National Electrical Code and NEC are registered trademarks of the National Fire Protection Association, Quincy, MA.
Electric
switchboard
150V nominal
or less
Effectively Insulated
Electric
switchboard
150V nominal
or less
Electric
switchboard
150V nominal
or less
Electric
switchboard
150V nominal
or less
Exposed
Live Parts
Exposed
Live Parts
Exposed
Live Parts
Grounded parts, concrete, etc
3’
3’
3’

elbaTwolfriAtinUroodtuOegatireH/ecnaigellA
stinUgnilooCstinUpmuPtaeH
rebmuNledoMtinUMFCrebmuNledoMtinUMFC
A0308A7A20063A0308H6A20593
A6308A7A20063A6308H6A20593
A8408A7A25704A8408H6A25244
A0608A7A25704A0608H6A25244
Required Opening = CFM / 300 FPM (Maximum)
Example:
Given:
Qtyof 2 unitsin anarea surroundedby afence ontwosides and solidwalls onthe othertwo sides.Units
are 2A7A8060A1000A -
Required:
Determinefreeairopeningspacerequiredin fence -
Solution:
4075CFM X Qty of 2 = 8150 CFM
8150 CFM / 300 FPM = 27.17 square feet
Round27.17to 27 square feetof free airopening inthe fence sectionssurrounding the units.It is recom-
mendedtoplace these openingequally on allfour sides,however,if one ortwo ofthe sides aresections of
thebuildingstructure,itis acceptable to placethem on two sides.
*TableproducedJan.2003.Forthemostcurrentinformation,pleaserefertospecificequipmentProductData.
Pg. 16

Allegiance / Heritage 18 unit dimensions
Pg.17
ledoMtinUesaBABC ledoMtinUeziSesaBABC
A0308A7A24"8/114"4/173"4/1431A0308H6A24"8/114"4/173"4/143
A6308A7A24"8/114"4/173"4/1431A6308H6A24"8/114"4/173"4/143
A8408A7A24"8/114"4/173"4/1431A8408H6A24"8/114"4/173"4/143
A0608A7A24"8/114"4/173"4/1431A0608H6A24"8/114"4/173"4/143

SectionIV - RefrigerantPiping
A.Purpose
1.Liquid line -The purpose oftheliquidrefrigerantlineistoconveyrefrigerant,inthe liquid state, from
theoutdoorunittotheindoorunit in the cooling mode andfromtheindoor unit to the outdoorunitinthe
heatingmode.
2.Gasline - The purpose ofthe gasline is toconvey refrigerant inthe gasstate and oilfrom the indoor
unittotheoutdoorunitinthecoolingmodeandfromtheoutdoorunittotheindoorunitintheheating
mode.
B. Limitations:
1.TheAllegiance/Heritage18utilizestwocompressorsthatsharethesamerefrigerationcircuit,how
ever,do notoperatesimultaneously.Therefore, it is crucial that refrigerantlinesareproperlysizedand do
notexceedthelengthset forthintheunit’sinstallationmanual.
2.Linelengthlimits:
A.Gasline=80feetlinearlength/ofthelinearlength,25 feet may be installed vertical.
B.Liquid line = 80 feet linear length/ofthelinearlength,25feetmaybeinstalledvertical.
3.No exceptions shall be allowed to these pipinglimitations.
C. Explanation:
1.Refrigerantlinesshall not exceed80 feet totalline length. /25 feet ofthe 80 feet maybe vertical. .
2.Liquidsubcoolingcannot be achieved on firststage if the liquid lineexceeds 80 feet / 25feet vertical.
3.Insufficientoilreturnduringfirststageoperationifthe gas line exceeds 80 feet / 25 feet vertical.
D. Forgreaterdetailregardingrefrigerantpiping refertoPublication32-3009-*(latest version)
25 Ft. Max
55 Ft. Max
80 Feet Max.
55 Ft. Max
25 Ft. Max
vertical
Pg.18

Pg. 19
NOTES

Literature Order Number
File Number ALG18-APG01-EN 05/03
Supersedes New
Stocking Location
Since American Standard has a policy of continuous product improvement, it reserves the
right to change design and specifications without notice.
American Standard, Inc
6200 Troup Highway
Tyler, Texas 75711
©2003American Standard, Inc.