Pennant PNCV User manual

Installation and Operation Instructions Document 1373A
H2379700A
Installation and Operation
Instructions for
PENNANT™
includes LOW TEMP PENNANT
Hydronic Boiler
Model PNCH
Water Heater
Model PNCV
Sizes 500-2000
U.S. Reg. 2,765,423
WARNING
If the information in this manual is not
followed exactly, a re or explosion may
result causing property damage, personal
injury or loss of life.
Do not store or use gasoline or other
ammable vapors and liquids in the vicinity
of this or any other appliance.
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do not
use any phone in your building.
• Immediately call your gas supplier from a
nearby phone. Follow the gas supplier's
instructions.
• If you cannot reach your gas supplier, call
the re department.
Installation and service must be performed
by a qualied installer, service agency, or gas
supplier.
AVERTISSEMENT
Assurez-vous de bien suivres les instructions
données dans cette notice pour réduire au
minimum le risque d’incendie ou d’explosion
ou pour éviter tout dommage matériel, toute
blessure ou la mort.
Ne pas entreposer ni utiliser d’essence ni
d’autres vapeurs ou liquides inammables dans
le voisinage de cet appareil ou de tout autre
appareil.
QUE FAIRE SI VOUS SENTEZ UNE ODEUR DE GAZ:
• Ne pas tenter d’allumer d’appareils.
• Ne touchez à aucun interrupteur. Ne pas vous
servir des téléphones dansle bâtiment où vous
vous trouvez.
• Appelez immédiatement votre fournisseur de
gaz depuis un voisin. Suivez les instructions du
fournisseur.
• Si vous ne pouvez rejoindre le fournisseur de
gaz, appelez le sservice des incendies.
L’installation et l’entretien doivent être assurés par
un installateur ou un service d’entretien qualié ou
par le fournisseur de gaz.
FOR YOUR SAFETY: This product must be installed and serviced by a professional service technician,
qualied in hot water boiler installation and maintenance. Improper installation and/or operation could
create carbon monoxide gas in ue gases which could cause serious injury, property damage, or death.
Improper installation and/or operation will void the warranty. For indoor installations, as an additional
measure of safety, Laars strongly recommends installation of suitable Carbon Monoxide detectors in the
vicinity of this appliance and in any adjacent occupied spaces.

LAARS Heating Systems
Page 2
TABLE OF CONTENTS
SECTION 1 General Information ............................4
1.A Introduction............................................................... 4
1.B Warranty...................................................................5
1.C ModelIdentication(Nomenclature)......................... 5
1.D Dimensions............................................................... 6
1.E Locating the Appliance ............................................. 7
1.F LocatingPump-MountedWaterHeaterwith
 RespecttoStorageTank(s)...................................... 7
1.G LocatingPump-MountedBoilerwithRespect
 toReturn/SupplyHeader.......................................... 7
1.H LocatingApplianceforCorrectHorizontal
Vent/DuctedAirDistanceFromOutsideWall........... 8
1.I InstallationKit ........................................................... 8
SECTION 2 Venting and Combustion Air .............9
2.A CombustionAir ......................................................... 9
2.A.1 CombustionAirFromRoom ..................................... 9
2.A.2 IntakeCombustionAir .............................................. 9
2.B Venting.................................................................... 10
2.B.1 VentCategories...................................................... 10
2.B.2 Category I Vent....................................................... 10
2.B.3 CommonVentingSystems ......................................11
2.B.4 Category III Vent..................................................... 13
2.C LocatingVent&CombustionAirTerminals............. 13
2.C.1 SideWallVentTerminal.......................................... 13
2.C.2 SideWallCombustionAirTerminal......................... 15
2.C.3 VerticalVentTerminal............................................. 15
2.C.4 VerticalCombustionAirTerminal............................ 15
2.D CommonVentTest—Boilers................................. 15
2.E VentTerminalsforOutdoorUnits............................ 16
SECTION 3 Gas Supply and Piping .....................17
3.A GasSupplyandPiping........................................... 17
SECTION 4 Water Connections BOILER
or WATER HEATER................18
4.A Boiler ..................................................................... 18
4.A.1 HeatingSystemPiping:
HotSupplyConnections—Boiler .......................... 18
4.A.2 ColdWaterMake-Up—Boiler ............................... 18
4.A.3 WaterFlowRequirements—Boiler ........................ 18
4.A.4 WaterFlowRequirements—
LowTemperaturePennantBoilers ........................ 18
4.A.5 FreezeProtection—Boiler .................................... 19
4.A.6 FillingtheBoilerSystem......................................... 22
4.B Water Heaters ....................................................... 24
4.B.1 WaterSystemPiping—WaterHeater .................... 24
4.B.2 HotWaterSupplyPiping—WaterHeater............... 25
4.B.3 WaterFlowRequirements—WaterHeater ............ 25
4.B.4 CombinedWaterHeating(potable)and
SpaceHeating—WaterHeater............................. 25
4.B.5 FreezeProtection–WaterHeater........................ 25
4.B.6 FillingtheWaterHeaterSystem............................. 30
SECTION 5 Electrical Connections.....................31
5.A InstallationWarnings .............................................. 31
5.B LineVoltageConnections....................................... 31
5.B.1 MainPower............................................................. 31
5.B.2 PumpPower........................................................... 31
5.B.3 Boiler/HeaterPump ............................................... 31
5.B.4 AuxiliaryPowerOutput........................................... 32
5.C LowVoltageConnections....................................... 32
5.C.1 FieldWiring-Inputs................................................ 32
5.C.1.a SafetyInterlocks..................................................... 32
5.C.1.b Boiler/HeaterHeatDemands.................................. 32
5.C.1.c FieldInputs(Open/Closed)..................................... 32
5.C.1.d TemperatureSensors ............................................. 32
5.C.1.e Analog(BAS)Input................................................. 33
5.C.2 FieldWiring-Outputs............................................ 33
5.C.2.a DryContacts........................................................... 33
5.C.2.b CascadeRS485 ..................................................... 34
5.C.2.c BASRS485(BACnetMS/TPorModbus)............... 34
5.C.2.d 24VAC ....................................................................34
5.D CascadeWiringConnections ................................. 35
5.E WiringDiagram...................................................... 36
5.F LadderDiagram...................................................... 38
SECTION 6 Touchscreen and System Ops ........40
6.A The Home Screen................................................. 40
6.A.1 HomeScreenStatusWindow................................. 40
6.A.2 HomeScreenActiveIcons ..................................... 41
6.B LOGIN, Lock / Unlock Display Screen................ 42
6.C Keypad Operations............................................... 43
6.D Quick Start .......................................................... 44
6.D.1 CH/DHW............................................................... 44
6.D.1.a CH1/DHW11.......................................................... 44
6.D.1.b CH2/DHW22.......................................................... 44
6.D.2 DHW/DHW3 .......................................................... 45
6.D.3 OutdoorReset ....................................................... 45
6.D.4 WarmWeatherShutDown................................... 45
6.D.5 Anti-ShortCycle..................................................... 46
6.D.6 Time&Date........................................................... 46
6.E Congure Screen......................................47
6.E.1 CH/DHW................................................................ 47
6.E.1.a CH1/DHW1............................................................. 47
6.E.1.b AdditionalSettings................................................. 50
6.E.2 CH2/DHW2............................................................. 50
6.E.3 DHW/DHW3 .......................................................... 51
6.E.4 OutdoorReset ....................................................... 51

Pennant (500-2000)Page 3
6.E.5 Cascade ........................................................... 53
6.E.5.a CongureLeadUnit................................................ 53
6.E.5.b CongureLagUnit.................................................. 54
6.E.5.c CascadeCH ........................................................... 55
6.E.5.d CascadeDHW........................................................ 56
6.E.5.e CascadeRotation.................................................. 56
6.E.5.f CascadeRedundancy ............................................ 57
6.E.5.g CascadeHybrid.................................................... 57
6.E.6 Pumps ...................................................................58
6.E.7 Firing Rate ............................................................. 58
6.E.8 TempLimits ........................................................... 59
6.E.9 External .................................................................59
6.E.9.a External–RemoteSetPoint .................................. 60
6.E.9.b ExternalFiringRate................................................ 61
6.E.10 SettingtheTimeandDate..................................... 62
6.E.11 Miscellaneous Features ................................. 62
6.E.11.a MixingValve.LowTempPennant.......................... 62
6.E.11.b Anti-ShortCycle..................................................... 63
6.E.11.c WirelessSetup ....................................................... 63
6.E.11.d WarmWeather....................................................... 63
6.E.11.e COMPort............................................................... 64
6.E.11.f TemperatureConversion ....................................... 65
6.E.11.g FrostProtection ..................................................... 65
6.E.12 Login ......................................................................65
6.F Service Screens.................................................... 66
6.F.1 Burner..................................................................... 66
6.F.2 DigitalI/O(Input/Output).................................... 66
6.F.3 AnalogI/O............................................................... 67
6.F.4 ScreenSettings ...................................................... 67
6.F.5 History ....................................................................68
6.F.6 Restart.................................................................... 68
6.F.7 FactoryReset ......................................................... 68
6.G Messages and USB .............................................. 68
6.G.1 Messages ............................................................... 68
6.G.2 USBFunctionality................................................... 69
6.H Active Demands.................................................... 70
6.I The Navigation Bar............................................... 70
6.J Date and Time Display Area ................................ 70
SECTION 7 Sequence of Operation ...................71
7.A RestartingthePennant........................................... 71
7.B SequenceofOperation .......................................... 71
7.C ShuttingDownthePennant.................................... 72
SECTION 8 Burner Set Up ....................................73
8.A SetUpfor0to2500FeetAltitude .......................... 73
8.B SetUpforHighAltitude(>2500Feet) .................. 73
SECTION 9 Maintenance......................................75
9.A SystemMaintenance.............................................. 75
9.B ApplianceMaintenanceandComponentDescription75
9.B.1 Burners................................................................... 75
9.B.2 Filter........................................................................75
9.B.3 GasValves ............................................................. 75
9.B.4 ManualResetHighLimitControl............................ 75
9.B.5 AutomaticResetHighLimitControl........................ 76
9.B.6 Controller................................................................ 76
9.B.7 Ignitors.................................................................... 77
9.B.8 IgnitionSensors...................................................... 77
9.B.9 Transformer ............................................................ 77
9.B.10 Blowers................................................................... 77
9.B.11 FlowSwitch ............................................................ 77
9.B.12 HeatExchangerCoil.............................................. 77
SECTION 10 Trouble Shooting ............................78
10.A ResolvingLockouts ................................................ 78
10.B DelayedIgnition—PossibleCauses ..................... 79
10.C ShortCycling—Boiler ........................................... 79
10.D ShortCycling—WaterHeater ............................... 79
10.E HighGasConsumption .......................................... 79
10.F TroubleshootingErrorsandLockouts..................... 80
10.G ParameterTables ................................................... 82
10.G.1 BoilerParameters(includingLowTemp)................ 82
10.G.2 WaterHeaterParmeters(includingLowTemp)...... 86
10.G.3 ModbusMemoryMap............................................. 90
10.G.4 BACnetMSTPMemoryMap .................................. 92
SECTION 11 Replacement Parts .........................94
11.A GeneralInformation................................................ 94
11.B PartsList.................................................................94
11.C PartsIllustrations.................................................. 100
6.E Congure Screen (continued)

LAARS Heating Systems
Page 4
WARNING
ThePennanthydronic,boilerorwaterheatermust
beinstalledinaccordancewiththeprocedures
detailedinthismanual,ortheLaarsHeating
Systemswarrantymaybevoided.Theinstallation
mustconformtotherequirementsofthelocal
jurisdictionhavingauthority,and,intheUnited
States,tothelatesteditionoftheNationalFuel
GasCode,ANSIZ223.1/NFPA54.InCanada,the
installationmustconformtothelatesteditionof
theNaturalGasandPropaneInstallationCode,
CSAB149.1and/orlocalcodes.Whererequiredby
theauthorityhavingjurisdiction,theinstallationof
PennantappliancesmustconformtotheStandard
forControlsandSafetyDevicesforAutomatically
FiredBoilers,ANSI/ASMECSD-1.Any
modicationstotheboiler,itsgascontrols,orwiring
mayvoidthewarranty.Ifeldconditionsrequire
modications,consultthefactoryrepresentative
beforeinitiatingsuchmodications.
AVERTISSEMENT
Anderéduireauminimumlesrisquesde
commotionélectrique,defeuoud’autrenature,
quipourraientcauserdesdommagesmatériels,
desblessuresoudesaccidentsmortels,les
chaudièresàeauchaudeouleschauffe-eau
Pennant doivent êtreinstallésconformémentaux
directivesdétailléescontenuesdanscemanuel,à
défautdequoilagarantiefournieparLaarsHeating
Systemsseraitannulée.L’installationdoitêtre
conformeauxexigencesdelaréglementationlocale
envigueuret,auxÉtats-Unis,àl’éditionlaplus
récenteduNaturalFuelGasCode(Codepourle
gazcombustiblenaturel)ANSIZ223.1/NFPA54.Au
Canada,l’installationdoitrespecterlesexigences
delaplusrécenteéditionduCoded’installationdu
gaznatureletdupropaneCSAB149.1,et/oudes
codeslocauxdeconstructionenvigueur.Lorsque
laréglementationlocalel’exige,l’installationdes
appareilsélectroménagersPennantdoitrespecter
lesexigencesduStandardforControlsandSafety
DevicesforAutomaticallyFiredBoilers(Codepour
leséquipementsdecommandeetdesécuritédes
chaudièresàcombustionautomatique),ANSI/
ASMECSD-1.Toutemodicationapportéeàla
chaudière,auxrégulateursdegazouaucâblage,
peutcompromettrelagarantie.Sicertaines
conditionsparticulièresrendentdesadaptations
nécessaires,consulterunreprésentantdufabricant
avantd’entreprendrecesmodications.
SECTION 1 General Information
USING THIS MANUAL– Because the
Pennant Boilers and Pennant Water Heaters are
identical appliances, with the exception of materials
of manufacture, labels and ultimate use application,
this manual provides information for the proper
installation, operation and maintenance of both
products. Where differences exist between the
application of the appliances and their operation,
the sections pertinent to only one appliance or the
other will be so identied.
In the Commonwealth of Massachusetts, this
appliance must be installed by a licensed plumber or
gas tter.
1.A Introduction
This manual provides information necessary
for the installation, operation, and maintenance of
Laars Heating Systems Pennant appliances (including
the Low Temp Pennant). Read this manual carefully
before installation.
All application and installation procedures
should be reviewed completely before proceeding with
the installation. Consult the Laars Heating Systems
factory, or local factory representative, with any issues
or questions regarding this equipment. Experience
has shown that most operating issues are caused by
improper installation.
The Pennant appliance is protected against over
pressurization. A pressure relief valve is tted to all
appliances. It is installed on the outlet header, at the
water outlet of the appliance.
IMPORTANT:Theinletgaspressuretotheappliance
mustnotexceed13"w.c.(3.2kPa).
All installations must be made in accordance with:
1) In the U.S., the " National Fuel Gas
Code"ANSI Z223.1/NFPA54, Latest Edition and all
applicable local codes as required by the Authorities
Having Jurisdiction (AHJ), or
2) In Canada, the "Natural Gas and Propane
Installation Code", CSA B149.1, latest edition and all
applicable local codes as required by the AHJ.
All electrical wiring is to be done in accordance with:
1). In the U.S., the "National Electrical Code"
(NEC), ANSI/NFPA 70, latest Edition and all
applicable local codes as required by the AHJ, or
2). In Canada, the “Canadian Electrical Code
- Part 1”, CSA STD. C22.1 and all applicable local
codes as required by the AHJ.
This appliance must be electrically grounded in
accordance with the applicable codes and standards
referenced above.

Pennant (500-2000)Page 5
1.B Warranty
Laars Heating Systems’appliances are covered
by a limited warranty. Owners should submit online
warranty registration at www.Laars.com.
All warranty claims must be made to an authorized
Laars Heating Systems representative, directly to
Customer Service, or online at www.Laars.com.
Claims must include the serial number and model
number (this information can be found on the rating
plate), installation date, and name of the installer.
Shipping costs are not included in the warranty
coverage.
1.C Model Identication (Nomenclature)
TACONORMALWATERPUMP
SERIES USAGE SIZE FUEL ALTITUDE
N:
L:
MODE
LOCATION FIRING REVISION HEAT
CODES
PN A
PNC H
V
0500
P
NA C C
J
X
H
X
EXCHANGER OPTION
PN:
N
IST&2NDCHARACTERS(MODELSERIES)
C:
PENNANT
3RDCHARACTER(MODELEFFICIENCY)
MIDEFFICIENCY(NON-CONDENSING)
4THCHARACTER(USAGE)
HYDRONICH:
V: VOLUMEWATER
500,000BTU/HRINPUT
0500:
0750: 750,000BTU/HRINPUT
1,000,000BTU/HRINPUT1000:
1500:
5THTHROUGH8THCHARACTERS(SIZE)
N:
P: PROPANE
1,500,000BTU/HRINPUT
9THCHARACTER(FUEL)
A:
NATURALGAS
10THCHARACTER(ALTITUDE)
C:
0-10,000FEET(0-3050M)
11THCHARACTER(LOCATION)
TWO-STAGE(PNCH&PNCV500-750)
C:
CONVERTIBLE(INDOOR/OUTDOOR)
12THCHARACTER(FIRINGMODE)
ON-OFF(PUMPMOUNTEDWITHMIXINGSYSTEMS)
13THCHARACTER(REVISION)
ENGINEERINGREVISIONCHARACTER,INSEQUENCE
14THCHARACTER(HEATEXCHANGER)
CSD-1,FM,ILJ:
STANDARDUNIT
5:
X:
TACOHARDWATERPUMP(VOLUMEWATERONLY)
15THCHARACTER(CONTROLOPTIONS)
N:
H:
X:
C
2,000,000BTU/HRINPUT2000:
C
P
POOLHEATERP:
K
N
L
P:
K:
THREE-STAGE(PNCH&PNCV1000)
N:
FOUR-STAGE(PNCH&PNCV1250-2000)
NOPUMP
5
16THCHARACTER(PUMPOPTIONS)
(STDPNCV,OPTPNCH-PNCP-PM)
B:
C:
N
PS
TACOSOFTWATERPUMP(VOLUMEWATERONLY)S:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
UNLESSOTHERWISESPECIFIED:
DONOTSCALEDRAWING.
THIRDANGLEPROJECTION.
DIMENSIONSAREININCHES.
FINISH:
FMA58B
MATERIAL:
HEATTREAT:
206073
DWG
SH REV
1G
206073
DWGNO:SIZE: SOFTWARE:
APPR
SA
SCALE:NONE
DATE
10/14/03
ANGULAR
± 1°
TOLERANCES:
DECIMAL
.X = ± .1
DRAFT
CHECK
APPROVALS
.XXX = ± .010
.XX = ± .03 ± 1/8
JMADDOCK
FRACTIONAL
PENNANT
MATRIX,MODELDESIGNATION
TITLE:
REV:
SHEET1OF1
G
CHANGE:
REV
G
ECR
16-154N-02
DRAFT
REVISIONS
CHECK APPR RELDATE
14thCHARACTER:ADD"5"INDICATINGHLWSTAMPVERSIONOF"P"
N/A
N/A
N/A
PURPOSEEXCEPTASSPECIFICALLYAUTHORIZED
HEREINAREPROPRIETARYTOLAARSHEATINGSYSTEMS
CO.ANDSHALLNOTBEREPRODUCED,TRANSFERRED
TOOTHERDOCUMENTS,USEDORDISCLOSED
THISDOCUMENTANDTHEINFORMATIONCONTAINED
INWRITINGBYLAARSHEATINGSYSTEMCO..
TOOTHERSFORMANUFACTURINGORANYOTHER
JM5-23-17
10/16/03
BLW
1250:
1750:
1,250,000BTU/HRINPUT
1,750,000BTU/HRINPUT
7005
0100
2105
5100
7105
0200
BP5-23-17 SH5-23-17
B
D
C
B&GSOFTWATERPUMP(VOLUMEWATERONLY)
B: B&GNORMALWATERPUMP
C: B&GHARDWATERPUMP(VOLUMEWATERONLY)
D:
3
3
WCB
MP
BRADFORDWHITEPRIVATELABELBW:
PENTAIRPOOLHEATER,PRIVATELABELblank:
PPENTAIRPOOLHEATER,PRIVATELABEL
C
M:
B
PENTAIRPOOLHEATER,PRIVATELABEL
GLASS-LINEDCASTIRON/CUPRONICKEL/BRONZETRIM
HLWSTAMPEDVERSIONOF"P"HEATEXCHANGER(OPTPNCV,N/APNCH-PNCP-PM)
GLASS-LINEDCASTIRON/CUPRONICKEL(OPTPNCH,N/APNCV-PNCP-PM)
GLASS-LINEDCASTIRON/COPPER(STDPNCH,N/APNCV-PNCP-PM)
GLASS-LINEDCASTIRON/COPPER/BRONZETRIM(STDPNCP-PM,N/APNCV,OPTPNCH)
Some accessory items are shipped in separate
packages. Verify receipt of all packages listed on
the packing slip. Inspect everything for damage
immediately upon delivery, and advise the carrier of
any shortages or damage. Any such claims should be
led with the carrier. The carrier, not the shipper, is
responsible for shortages and damage to the shipment
whether visible or concealed.

LAARS Heating Systems
Page 6
Figure 1. Dimensional Data.
SHIPPINGWEIGHT*
SIZE lbs. kg
500 640 290
750 735 333
1000 830 376
1250 925 420
1500 1020 463
1750 1115 506
2000 1210 549
*Add75to200lbs(
34 to 91 kg ),
dependingonsize,
forpump-mountedunits.
ØØ
Size A BC D E F G H
Air
Conn.
W*
Vent
Conn.
V*
Horiz.
Vent
Pipe
500 33½ 85 15¾ 40 5¾ 15 29¾ 76 33¾ 86 7¾ 20 8¾ 22 46 117 615 820 615
750 45½ 116 21¾ 55 5¾ 15 29¾ 76 33¾ 86 7¾ 20 8¾ 22 58 147 820 10 25 820
1000 57½ 146 28¾ 73 5¾ 15 29¾ 76 33¾ 86 7¾ 20 718 70 178 820 10 25 820
1250 68 172 34 86 101∕826 30¾ 78 311∕879 8¾ 22 8¾ 22 80 203 12 30 12 30 10 25
1500 78½ 199 39¾ 101 101∕826 30¾ 78 311∕879 8¾ 22 8¾ 22 91 231 12 30 12 30 10 25
1750 89 226 44½ 113 101∕826 30¾ 78 311∕879 8¾ 22 8¾ 22 101 256 12 30 14 36 12 30
2000 99½ 253 49¾ 126 101∕826 30¾ 78 311∕879 8¾ 22 8¾ 22 112 284 12 30 14 36 12 30
*AirandventconnectionsmaybeontoporbackofthePennant,andareeldconvertible.Dimensionsininches cm
1.D Dimensions

Pennant (500-2000)Page 7
1.E Locating the Appliance
The appliance should be located to provide
clearances on all sides for maintenance and inspection.
It should not be located in an area where leakage of
any connections will result in damage to the area
adjacent to the appliance or to lower oors of the
structure.
When such a location is not available, it is
recommended that a suitable drain pan, adequately
drained, be installed under the appliance.
The appliance is design certied by CSA-
International for installation on combustible ooring;
in basements; in closets, utility rooms or alcoves.
Pennant Boilers or Water Heaters must never be
installed on carpeting. The location for the appliance
should be chosen with regard to the vent pipe lengths
and external plumbing. The unit shall be installed such
that the gas ignition system components are protected
from water (dripping, spraying, rain, etc.) during
operation and service (circulator replacement, control
replacement, etc.). When vented vertically, the Pennant
must be located as close as practical to a chimney or
outside wall. If the vent terminal and/or combustion
air terminal terminate through a wall, and there is
potential for snow accumulation in the local area, both
terminals should be installed at an appropriate level
above grade.
The dimensions and requirements that are shown
in Table 2 should be met when choosing the locations
for the appliance.
1.F Locating Pump-Mounted Water
Heater with Respect to Storage Tank(s)
For best results, a pump-mounted Pennant water
heater should be located within 15 feet (4.6m) of the
storage tank(s). The pump is sized for 30 feet (9.1m)
of piping.
If the appliance must be installed with longer
piping runs, then larger diameter pipe or tubing shall
be used. Consult the factory for assistance.
1.G Locating Pump-Mounted Boiler with
Respect to Return/Supply Header
For the best results, a pump-mounted Pennant
Boiler should be located within 15 feet (4.6m) of the
supply and return headers. The pump is sized for 30
feet (9.1m) of piping.
If the appliance must be installed with longer
piping runs, then larger diameter tubing shall be used.
Consult the factory for assistance.
   HORIZONTAL INTAKEAIR
  VENTCOLLAR VENTPIPE PIPE MAX.PIPE MAX.NO. SIDEWALL SIDEWALL
 SIZE SIZE DIAMETER DIAMETER LENGTH OFELBOWS VENT COMBUSTION
       TERMINAL AIRTERMINAL
in. cm in. cm in. cm ft. mPARTNUMBER PARTNUMBER
500 820 615 615 50 15 3 CA001401 CA20260701
750 10 25 820 820 50 15 3 CA001402 CA20260703
1000 10 25 820 820 50 15 3 CA001402 CA20260703
1250 12 30 10 25 12 30 50 15 3 CA001405 CA20260706
1500 12 30 10 25 12 30 50 15 3 CA001405 CA20260706
1750 14 36 12 30 12 30 50 15 3 CA001404 CA20260706
2000 14 36 12 30 12 30 50 15 3 CA001404 CA20260706
Table 1. Horizontal Vent / Combustion Air Parameters.
  REQUIRED RECOMMENDED
 APPLIANCE CLEARANCEFROM SERVICEACCESS
 SURFACE COMBUSTIBLEMATERIAL CLEARANCE
inches cm inches cm
 LeftSide 12.5 24 61
 RightSide 12.5 24 61
 Top 12.5 12 30
 Back 12.5 12** 30**
Front 12.5 36 91
Vertical
 (Category1) 6* 15.2*
Vent
 Horizontal perUL1738venting
 (Category3) systemsupplier’s
 Vent instructions
*1"(2.5cm)whenb-ventisused.
**Whenventand/orcombustionairconnectstotheback,
recommendedclearanceis36"(91cm).
Table 2. Clearances.

LAARS Heating Systems
Page 8
1.H Locating Appliance for Correct
Horizontal Vent/Ducted Air Distance
From Outside Wall
The forced draft combustion air blower/blowers
in the appliance has/have sufcient power to pull air
and vent properly when the following guidelines for
horizontal air and vent are followed (see Table 1 on
page 7).
NOTE:Onallmodelsizes,theventcollarsizeis
largerthanthesizeoftheventpipethatcanbeused.
Ventcollarsizeandhorizontalpipediameterscan
befoundinTable1Thelargerventcollarsizeisto
accommodateCategoryI(vertical)ventsystems.
NOTE:Whenlocatedonthesamewall,thePennant
combustionairintaketerminalmustbeinstalled
aminimumof12"(30cm)belowtheexhaustvent
terminalandseparatedbyaminimumof36inches
(91cm)horizontally.
The air intake terminal must be installed high
enough to avoid blockage from snow, leaves and
other debris.
All units are shipped with an Installation Kit which
contains the following items.
 Description Qty
1. TerminalBlockInsertion/RemovalTools 1
2. Well,Immersion,for3/16"Bulb 1
3. Well,Immersion,1/2"NPT 1
4. Sensor,Outlet,Thermistor,Dual,10K, 1
5. TaperedRubberStopper 1
6. Resistor,1.5K,1/4Watt,250V,Axial 2
7. Bushing,Nylon 3
8. CapillaryClamp 1
9. OutdoorSensor 1
10.Sensors,Inlet,Temperature,Water 3
11. Label,Box,RemoteSensor 1
1.I Installation Kit
Figure 2. Installation Kit Components
1
2
3
4
5
6
7
89
10
11

Pennant (500-2000)Page 9
  EACHOPENING*
 SIZE SQUARE INCHES SQUARE CM
500 125 807
750 188 1213
1000 250 1613
1250 313 2020
1500 375 2420
1750 438 2826
2000 500 3226
*NetFreeAreainSquareInches/Squarecm
Areaindicatedisforoneoftwoopenings;oneatoorleveland
oneattheceiling,sothetotalnetfreeareacouldbedoublethe
guresindicated.
Thischartisforusewhencommunicatingdirectlywiththe
outdoors.Forspecialconditionsandalternatemethods,referto
thelatesteditionofANSIZ223.1.
Note:Checkwithlouvermanufacturersfornetfreeareaof
louvers.Correctforscreenresistancetothenetfreearea
ifascreenisinstalled.Checkalllocalcodesapplicableto
combustionair.
Table 3. Combustion Air Openings.
with the outdoors. When directly communicating
with the outdoors, or when communicating to the
outdoors through vertical ducts, each opening shall
have a minimum free area of 1 square inch per 4000
Btu/hr (5.5 square cm/kW) of total input rating of all
equipment in the enclosure. When communicating to
the outdoors through horizontal ducts, each opening
shall have a minimum free area of not less than
1 square inch per 2000 Btu/hr (11 square cm/kW) of
total input rating of all equipment in the enclosure.
Table 3 shows data for this sizing method, for each
Pennant model.
Method 2: One permanent opening, commencing
within 12 inches (30 cm) of the top of the enclosure,
shall be permitted. The opening shall directly
communicate with the outdoors or shall communicate
through a vertical or horizontal duct to the outdoors
or spaces that directly communicate with the outdoors
and shall have a minimum free area of 1 square inch
per 3000 Btu/hr (7 square cm/kW) of the total input
rating of all equipment located in the enclosure. This
opening must not be less than the sum of the areas of
all vent connectors in the conned space.
Other methods of introducing combustion and
ventilation air are acceptable, providing they conform
to the requirements in the applicable codes listed
above.
In Canada, consult local building and safety
codes or, in absence of such requirements, follow CSA
B149.1.
2.A.2 Intake Combustion Air
The combustion air can be taken through the
wall, or through the roof. When taken from the wall, it
SECTION 2 Venting and
Combustion Air
2.A Combustion Air
Pennant boilers and water heaters must have
provisions for combustion and ventilation air in
accordance with Section 5.3, Air for Combustion and
Ventilation, of the National Fuel Gas Code, ANSI
Z223.1, or Sections 7.2, 7.3 or 7.4 of CSA B149.1,
Installation Codes, or applicable provisions of the
local building codes.
A Pennant appliance may receive combustion
air from the space in which it is installed, or it can be
ducted directly to the unit from the outside. Ventilation
air must be provided in either case.
2.A.1 Combustion Air From Room
In the United States, the most common
requirements specify that the space shall communicate
with the outdoors in accordance with method 1 or 2,
which follow. Where ducts are used, they shall be of
the same cross-sectional area as the free area of the
openings to which they connect.
Method 1: Two permanent openings, one
commencing within 12 inches (30 cm) of the top
and one commencing within 12 inches (30 cm) of
the bottom, of the enclosure shall be provided. The
openings shall communicate directly, or by ducts,
with the outdoors or spaces that freely communicate
WARNING
Forindoorinstallations,asanadditionalmeasure
ofsafety,Laarsstronglyrecommendsinstallationof
suitableCarbonMonoxidedetectorsinthevicinity
ofthisapplianceandinanyadjacentoccupied
spaces.
AVERTISSEMENT
Pourdesinstallationsintérieures,Laars
recommandefortement,commemesuredesécurité
supplémentaire,l’installationdedétecteursde
monoxydedecarboneadaptésdanslevoisinage
del’appareiletdanschacunedespièceshabitées
adjacentes.

LAARS Heating Systems
Page 10
Figure 3. Combustion Air and Vent Through Roof.
must be taken from out-of-doors by means of the Laars
horizontal wall terminal (see Table 1). When taken
from the roof, a eld-supplied rain cap or an elbow
arrangement must be used to prevent entry of rain
water (see Figure 3).
Use single-wall galvanized pipe, per Table 4, for
the combustion air intake (see Table 1) for appropriate
size. Route the intake to the heater as directly as
possible. Seal all joints with tape. Provide adequate
hangers. The unit must not support the weight of
the combustion air intake pipe. Maximum linear
pipelength allowed is 50 feet (15.2m). Three elbows
have been calculated into the 50-foot (15.2m) linear
run. Subtract 10 allowable linear feet (3.0m) for every
additional elbow used (see Table 1). When fewer than
3 elbows are used, the maximum linear pipe length
allowed is still 50 feet (15.2m).
The connection for the intake air pipe is on the
lter box. The Pennant appliances may have venting
and combustion air ducting attached to the top or the
back. They are shipped with the connections at the
top. For attaching either or both pipes to the back,
the mounting anges are reversible by removing the
mounting screws and orienting the anges in the
desired position. Replace the screws after positioning
anges. Run a bead of silicone around the collar and
slide the pipe over the collar. Secure with sheet metal
screws.
In addition to air needed for combustion, air
shall also be supplied for ventilation, including all air
required for comfort and proper working conditions
for personnel. The Pennant loses less than 1 percent of
its input rating to the room, but other heat sources may
be present.
TERM DESCRIPTION
 Pipe Single-wallgalvanizedsteelpipe,24gauge
  minimum(eitherinsulatedornon-insulated)
 Joint Permanentducttapeoraluminumtape
 Sealing
Table 4. Required Combustion Air Piping Material.
2.B Venting
2.B.1 Vent Categories
Depending upon desired Pennant venting, it may
be considered a Category I or a Category III appliance.
In general, a vertical vent system will be a Category
I system. However, in rare instances, a Pennant’s
vertical vent system may be considered Category
III. In the U.S., the National Fuel Gas Code (ANSI
Z223.1-Latest Edition), or in Canada the CSA B149.1
(latest edition), denes a Category I vent system, and
includes rules and tables to size these vent systems. If
the Pennant’s vertical vent system does not satisfy the
criteria for Category I venting, it must be vented as a
Category III system.
All Pennant vent systems which discharge
horizontally (without the use of a power venter) are
considered Category III vent systems.
2.B.2 Category I Vent
When vented as a category I appliance, the
vent system must conform to the National Fuel Gas
Code (ANSI Z223.1-Latest Edition) in the U.S., or
in Canada, to CSA B149.1 (latest edition). The vent
system must be sized and installed for a Category I
Fan-Assisted Appliance.
If chimney height is greater than 25 feet, or
if multiple units are vented into the same vertical
vent, a barometric damper must be installed on each
appliance, such that the ue draft does not exceed
(negative) 0.1" w.c.
If using a power venter for any type of Category
I venting, the draft should be set between (negative)
0.01 and 0.10" w.c.

Pennant (500-2000)Page 11
2.B.3 Common Venting Systems
Pennant units are Category I fan-assisted when
vented vertically and adhering to all applicable
codes. Pennant units are not allowed to be vented
into a common horizontal Cat III vent system
(horizontal discharge or other conguration for Cat
III), unless a properly sized vent fan is used, and the
common vent system is properly designed by the
vent fan manufacturer or a qualied engineer. When
common venting Pennant fan-assisted unit with other
appliances through one shared vertical duct called a
“common vent”, special care must be taken by the
installer to ensure safe operation. In the event that
the common vent is blocked, it is possible, especially
for fan-assisted devices, to vent backwards through
non-operating appliances sharing the vent, allowing
combustion products to inltrate occupied spaces.
If the appliances are allowed to operate in this
condition, serious injury or death may occur.
WARNING
Operationofapplianceswithablockedcommon
ventmayleadtoseriousinjuryordeath.Safety
devicesmustbeimplementedtopreventblocked
commonventoperation.Ifsafeoperationofall
appliancesconnectedtoacommonventcannot
beassured,includingpreventionofspillageofue
gassesintolivingspaces,commonventingshould
notbeapplied,andappliancesshouldeachbe
ventedseparately.
AVERTISSEMENT
Lefonctionnementd’appareilsconnectésàun
éventcommunbouchépeutprovoquerdesérieuses
blessurescorporellesoulamort.Desdispositifsde
sécuritédoiventêtremisenplacepourempêcher
quelesappareilssoientutilisésavecunévent
communbouché.Siunfonctionnementsécuritaire
detouslesappareilsreliésàunéventcommunetsi
lapréventiondesdégagementsaccidentelsdegaz
decombustiondansdeszoneshabitéesnepeuvent
pasêtreassurés,unéventcommunnedoitpas
êtremisenplaceetlesappareilsdoiventêtremunis
d’éventsindividuelsséparés.
It is for this reason that, in addition to
following proper vent sizing, construction and safety
requirements from the National Fuel Gas Code, ANSI
Z223.1 or in Canada, from CSA B149.1 as well as
all applicable local codes, it is required that installers
provide some means to prevent operation with a
blocked common vent. It is suggested that a blocked
vent safety system be employed such that if the switch
from one appliance trips due to excessive stack spill
or backpressure indicating a blocked vent condition,
that all appliances attached to the vent be locked out
and prevented from operating. Note that the Pennant
is equipped with a blocked vent safety (pressure)
switch, as shipped. However, this safety switch has
only been designed and tested to be effective in
installations where the Pennant is vented separately
and NOT common vented with other appliances. As an
additional precaution, it is recommended that a Carbon
Monoxide (CO) alarm be installed in all enclosed
spaces containing combustion appliances. If assistance
is required in determining how a blocked vent safety
system should be connected to a LAARS product,
please call Applications Engineering at the Rochester
phone number listed on back cover of this manual.
Refer to the installation and operating
instructions on all appliances to be common vented
for instructions, warnings, restrictions and safety
requirements. If safe operation of all appliances
connected to a common vent cannot be assured,
including prevention of spillage of ue gasses into
living spaces, common venting should not be applied,
and appliances should each be vented separately.

LAARS Heating Systems
Page 12
U.S. Installations (see note 1) Canadian Installations (see note 2)
A = Clearanceabovegrade,veranda,porch, 12inches(30cm) 12inches(30cm)
deck,orbalcony
B = Clearancetowindowordoorthatmaybe 4feet(1.2m)belowortosideofopening; 36inches(91cm)
opened 1foot(30cm)aboveopening
C = Clearancetopermanentlyclosedwindow Seenote4 Seenote5
D = Verticalclearancetoventilatedsoftlocated
 abovetheterminalwithinahorizontal Seenote4 Seenote5
 distanceof2feet(61cm)fromthecenter
 lineoftheterminal
E = Clearancetounventilatedsoft Seenote4 Seenote5
F = Clearancetooutsidecorner Seenote4 Seenote5
G = Clearancetoinsidecorner Seenote4 Seenote5
H = Clearancetoeachsideofcenterline  3feet(91cm)withinaheight15feetabove
 extendedabovemeter/regulatorassembly Seenote4 themeter/regulatorassembly
I = Clearancetoserviceregulatorventoutlet Seenote4 3feet(91cm)
J = Clearancetononmechanicalairsupplyinlet
tobuildingorthecombustionairinletto 4feet(1.2m)belowortosideofopening; 36inches(91cm)
anyotherappliance 1foot(30cm)aboveopening
K = Clearancetoamechanicalairsupplyinlet 3feet(91cm)aboveifwithin10feet(3m) 6feet(1.83m)
  horizontally
Ventterminationnotallowedinthislocation
Ventterminationnotallowedinthislocation forcategoryIVappliances.Aventshallnot
L = Clearanceabovepavedsidewalkorpaved forcategoryIVappliances.ForCategoryIII terminatedirectlyaboveasidewalkorpaved
 drivewaylocatedonpublicproperty appliances,ventmustterminateatleast7 drivewaythatislocatedbetweentwosingle
  feet(2.13m)abovethesidewalkordriveway. familydwellingsandservesbothdwellings.
   ForCategoryIIIappliancesthatdonotviolate
   thepreviouscondition,ventmustterminate
   atleast7feet(2.13m)abovethesidewalkor
   driveway.
M = Clearanceunderveranda,porch,deck, Seenote4 12inches(30cm)(seenote3)
 orbalcony
Notes:
1. InaccordancewiththecurrentANSIZ223.1/NFPA54NationalFuelGasCode.
2. InaccordancewiththecurrentCSA-B149.1InstallationCodes.
3. Permittedonlyifveranda,porch,deck,orbalconyisfullyopenonaminimumoftwosidesbeneaththeoor.
4. ForclearancesnotspeciedinANSIZ223.1/NFPA54,clearanceisinaccordancewithlocalinstallationcodesandtherequirementsof
 thegassupplier.
5. ForclearancesnotspeciedinCSA-B149.1,clearanceisinaccordancewithlocalinstallationcodesandtherequirementsofthegas
 supplier.
Figure 4. Combustion Air and Vent Through Side Wall.

Pennant (500-2000)Page 13
2.B.4 Category III Vent
When the Pennant is vented with horizontal
discharge, it must be installed per this installation
manual and the venting system manufacturer’s
installation instructions. The vent system must be
sealed stainless steel, per Table 5.
Route the vent pipe to the heater as directly as
possible. Seal all joints and provide adequate hangers
as required in the venting system manufacturer’s
Installation Instructions. Horizontal portions of the
venting system must be supported to prevent sagging
and may not have any low sections that could trap
condensate.
The unit must not support the weight of the vent
pipe. Horizontal runs must slope downwards not less
than ¼ inch per foot (2 cm/m) from the unit to the vent
terminal.
L’appareil ne doit pas supporter le poids de la
gaine d’évent. Les parties horizontales doivent être
installées avec une pente de 2 cm/m (1/4 inch par pied)
descendant de l’appareil vers la sortie de l’évent.
Reference Table 1 for the size of the Category
III vent system. Up to three elbows can be used with
50 linear feet (15.2m) of pipe. Subtract 10 allowable
linear feet (3.0m) for every additional elbow used.
2. Vent terminals for condensing appliances or
appliances with condensing vents are not
permitted to terminate above a public walkway,
or over an area where condensate or vapor could
create a nuisance or hazard.
3. Locate the vent terminal so that vent gases cannot
be drawn into air conditioning system inlets.
4. Locate the vent terminal so that vent gases cannot
enter the building through doors, windows,
gravity inlets or other openings. Whenever
possible, locations under windows or near doors
should be avoided.
5. Locate the vent terminal so that it cannot be blocked
by snow. The installer may determine that a vent
terminal must be higher than the minimum shown
in codes, depending upon local conditions.
6. Locate the terminal so the vent exhaust does
not settle on building surfaces or other nearby
objects. Vent products may damage such
surfaces or objects.
7. If the boiler or water heater uses ducted
combustion air from an intake terminal located
on the same wall, locate the vent terminal at least
3 feet (0.9m) horizontally from the combustion
air terminal, and locate the vent terminal at least
1 foot (0.3m) above the combustion air terminal.
TERM DESCRIPTION
 Pipe MustcomplywithULStandard1738
  suchasType29-4CStainlessSteel
  (eitherinsulatedornon-insulated).
 Joint Followventmanufacturer’sinstructions
Sealing
Table 5. Required Horizontal Venting Material.
WARNING
Theoutdoorventterminalgetshot.Unitmustbe
installedinsuchawayastoreducetheriskof
burnsfromcontactwiththeventterminal.
2.C Locating Vent & Combustion Air
Terminals
2.C.1 Side Wall Vent Terminal
The appropriate Laars side wall vent hood must
be used, and is listed in the installation and operation
manual. The terminal provides a means of installing
the vent piping through the building wall, and must
be located in accordance with ANSI Z223.1/NFPA 54
and applicable local codes. In Canada, the installation
must be in accordance with CSA B149.1 or .2 and
local applicable codes. Consider the following when
installing the terminal:
1. Figure 4 shows the requirements for mechanical
vent terminal clearances for the U.S. and Canada.
WARNING
Theoutdoorventterminalgetshot.Unitmustbe
installedinsuchawayastoreducetheriskof
burnsfromcontactwiththeventterminal.
AVERTISSEMENT
Lasortied’éventàl’extérieurdevienttrèschaude.
Elledoitêtreinstalléedefaçonàréduirelerisque
debrûluresaucontactdel’extrémitédel’évent.
Important Note: Massachusetts Code
Requirement.
From Massachusetts Rules and
Regulations 248 CMR 5.08:
(a) For all side wall horizontally vented gas
fueled equipment installed in every dwelling,
building or structure used in whole or in
part for residential purposes, including those
owned or operated by the Commonwealth
and where the side wall exhaust vent
termination is less than seven (7) feet above
nished grade in the area of the venting,
including but not limited to decks and
porches, the following requirements shall be
satised:

LAARS Heating Systems
Page 14
1. INSTALLATION OF CARBON MONOXIDE
DETECTORS.
At the time of installation of the side wall
horizontal vented gas fueled equipment, the
installing plumber or gastter shall observe that
a hard-wired carbon monoxide detector with an
alarm and battery back-up is installed on the oor
level where the gas equipment is to be installed.
In addition, the installing plumber or gastter
shall observe that a battery operated or hard-
wired carbon monoxide detector with an alarm is
installed on each additional level of the dwelling,
building or structure served by the side wall
horizontal vented gas fueled equipment. It shall be
the responsibility of the property owner to secure
the services of qualied licensed professionals for
the installation of hard-wired carbon monoxide
detectors.
a. In the event that the side wall horizontally vented
gas fueled equipment is installed in a crawl space
or an attic, the hard-wired carbon monoxide
detector with alarm and battery back-up may be
installed on the next adjacent oor level.
b. In the event that the requirements of this
subdivision cannot be met at the time of
completion of installation, the owner shall have a
period of thirty (30) days to comply with the above
requirements; provided, however, that during said
thirty (30) day period, a battery operated carbon
monoxide detector with an alarm shall be installed.
2. APPROVED CARBON MONOXIDE
DETECTORS.
Each carbon monoxide detector as required in
accordance with the above provisions shall comply
with NFPA 720 and be ANSI/UL 2034 listed and
IAS certied.
3. SIGNAGE.
A metal or plastic identication plate shall be
permanently mounted to the exterior of the
building at a minimum height of eight (8) feet
above grade directly in line with the exhaust vent
terminal for the horizontally vented gas fueled
heating appliance or equipment. The sign shall
read, in print size no less than one-half (½) inch
in size, “GAS VENT DIRECTLY BELOW. KEEP
CLEAR OF ALL OBSTRUCTIONS”.
4. INSPECTION.
The state or local gas inspector of the side wall
horizontally vented gas fueled equipment shall not
approve the installation unless, upon inspection,
the inspector observes carbon monoxide detectors
and signage installed in accordance with the
provisions of 248 CMR 5.08(2)(a) 1 through 4.
(b) EXEMPTIONS: The following equipment is
exempt from 248 CMR 5.08(2)(a) 1 through 4:
1. The equipment listed in Chapter 10 entitled
“Equipment Not Required To Be Vented” in the
most current edition of NFPA 54 as adopted by
the Board; and
2. Product Approved side wall horizontal vented gas
fueled equipment installed in a room or structure
separate from the dwelling, building or structure
used in whole or in part for residential purposes.
(c) MANUFACTURER REQUIREMENTS –
GAS EQUIPMENT VENTING SYSTEM
PROVIDED. When the manufacturer of
ProductApproved side wall horizontally
vented gas equipment provides a venting
system design or venting system components
with the equipment, the instructions provided
by the manufacturer for installation of the
equipment and the venting system shall
include:
1. Detailed instructions for the installation of the
venting system design or the venting system
components; and
2. A complete parts list for the venting system
design or venting system.
(d) MANUFACTURER REQUIREMENTS – GAS
EQUIPMENT VENTING SYSTEM NOT
PROVIDED. When the manufacturer of a
ProductApproved side wall horizontally vented
gas fueled equipment does not provide the parts
for venting the fuel gases, but identies “special
venting systems”, the following requirements
shall be satised by the manufacturer:
1. The referenced “special venting system”
instructions shall be included with the appliance or
equipment installation instructions; and
2. The “special venting systems” shall be Product
Approved by the Board, and the instructions for
that system shall include a parts list and detailed
installation instructions.
(e) A copy of all installation instructions for all
ProductApproved side wall horizontally vented
gas fueled equipment, all venting instructions,
all parts lists for venting instructions, and/or all
venting design instructions shall remain with the
appliance or equipment at the completion of the
installation.

Pennant (500-2000)Page 15
2.C.2 Side Wall Combustion Air Terminal
The Laars side wall combustion air terminal
(listed in Table 1) must be used when the unit takes
its combustion air through a duct from a side wall.
Consider the following when installing the terminal:
1. Do not locate the air inlet terminal near a
source of corrosive chemical fumes (e.g.,
cleaning uid, chlorinated compounds, etc.)
2. Locate the terminal so that it will not be subject
to damage by accident or vandalism.
3. Locate the combustion air terminal so that it
cannot be blocked by snow. The National Fuel
Gas Code requires that it be at least 12 inches
(30 cm) above grade, but the installer may
determine it should be higher, depending upon
local conditions.
4. If the Pennant is side-wall vented to the same
wall, locate the vent terminal at least 3 feet
(0.9m) horizontally from the combustion air
terminal, and locate the vent terminal at least 1
foot (0.3m) above the combustion air terminal
(see Figure 4).
2.C.3 Vertical Vent Terminal
When the unit is vented through the roof, the
vent must extend at least 3 feet (0.9m) above the
point at which it penetrates the roof. It must extend
at least 2 feet (0.6m) higher than any portion of
a building within a horizontal distance of 10 feet
(3.0m), and high enough above the roof line to
prevent blockage from snow. When the combustion
air is taken from the roof, the combustion air
must terminate at least 12" (30cm) below the vent
terminal (see Figure 3).
2.C.4 Vertical Combustion Air Terminal
When combustion air is taken from the roof,
a eld-supplied rain cap or an elbow arrangement
must be used to prevent entry of rain water (see
Figure 3). The opening on the end of the terminal
must be at least 12" (30cm) above the point at which
it penetrates the roof, and high enough above the
roof line to prevent blockage from snow. When
the vent terminates on the roof, the combustion air
must terminate at least 12" (30cm) below the vent
terminal.
2.D Common Vent Test — Boilers
When an existing boiler is removed from
a common venting system, the common venting
system is likely to be too large for proper venting of
the appliances remaining connected to it.
At the time of removal of an existing boiler,
the following steps shall be followed with each
appliance remaining connected to the common
venting system placed in operation, while the other
appliances remaining connected to the common venting
system are not in operation.
1. Seal any unused openings in the common venting
system.
2. Visually inspect the venting system for proper
size and horizontal pitch and determine there is
no blockage or restriction, leakage, corrosion and
other deciencies which could cause an unsafe
condition.
3. Insofar as it is practical, close all building doors
and windows and all doors between the space in
which the appliances remaining connected to the
common venting system are located and other
spaces of the building. Turn on clothes dryers
and any appliance not connected to the common
venting system. Turn on any exhaust fans, such
as range hoods and bathroom exhausts, so they
will operate at maximum speed. Do not operate a
summer exhaust fan. Close replace dampers.
4. Place in operation the appliance being inspected.
Follow the lighting instructions. Adjust thermostat
so appliance will operate continuously.
5. Test for spillage at the draft hood relief opening
after 5 minutes of main burner operation. Use
the ame of a match or candle, or smoke from a
cigarette, cigar or pipe.
6. After it has been determined that each appliance
remaining connected to the common venting
system properly vents when tested as outlined
above, return doors, windows, exhaust fans,
replace dampers and any other gas burning
appliance to their previous conditions of use.
7. Any improper operation of the common venting
system should be corrected so that the installation
conforms to the National Fuel Gas Code, ANSI
Z223.1/NFPA 54 and/or CSA B149.1, Installation
Codes. When resizing any portion of the common
venting system, the common venting system
should be resized to approach the minimum size
as determined using the appropriate tables in Part
II of the National Fuel Gas Code, ANSI Z223.1/
NFPA 54 and/or CSA B149.1, Installation Codes.
2.D Véricationdeséventscommuns—
Chaudières
Lorsqu’une chaudière existante est déconnectée du
réseau d’évents commun, ce réseau d’évents commun
devient probablement trop grand pour les appareils qui
lui restent connectés. Lorsqu’une chaudière existante
est retirée, les étapes suivantes doivent être accomplies
pour chaque appareil qui reste connecté au réseau
d’évents commun utilisé, alors que les autres appareils
qui sont encore connectés au réseau commun d’évents
ne sont pas en fonctionnement.:
1. Sceller toutes les ouvertures non utilisées du
système d'évacuation.

LAARS Heating Systems
Page 16
  OUTDOOR OUTDOOR
 SIZE VENT COMBUSTION
  TERMINAL AIRTERMINAL
500 20254703 D2007900
750 20254705 D2008000
1000 20254705 D2008000
1250 D2007700 D2008200
1500 D2007700 D2008200
1750 D2007800 D2008200
2000 D2007800 D2008200
Table 6. Vent Terminals for Outdoor Units.
2.E Vent Terminals for Outdoor Units
For outdoor applications, the vent and
combustion air openings must be covered with proper
terminals to prevent rain, snow and other objects from
falling into the Pennant.
If local codes allow, outdoor installations may
use 1' of appropriately sized galvanized single wall
or B-Vent and a rain cap for exhaust vent termination
in the default conguration (venting out of the top).
An appropriately sized galvanized 90° ell, positioned
with the opening facing down, may be used on the
combustion air inlet in the default conguration on
the back of the unit. Note that some local codes may
require a higher vertical vent height, extending above
any perimeter fencing, etc. In installations where
the appearance of the vent is objectionable, the low
prole vent terminals in Table 6 may be used.
Part numbers for the low prole terminals
to cover the vent and combustion air openings are
shown in Table 6.
2. Inspecter de façon visuelle le système
d'évacuation pour déterminer la grosseur et
l'inclinaison horizontale qui conviennent et
s'assurer que le système est exempt d'obstruction,
d'étranglement, de fuite, de corrosion et autres
défaillances qui pourraient présenter des risques.
3. Dans la mesure du possible, fermer toutes les
portes et les fenêtres du bâtiment et toutes les
portes entre l'espace où les appareils toujours
raccordés au système d'évacuation sont installés
et les autres espaces du bâtiment. Mettre en
marche les sécheuses, tous les appareils non
raccordés au système d'évacuation common
et tous les ventilateurs d'extraction comme
les hottes de cuisinière et les ventilateurs des
salles de bain. S'assurer que ces ventilateurs
fonctionnent à la vitesse maximale. Ne pas faire
fonctionner les ventilateurs d'été. Fermer les
registres des cheminées.
4. Mettre l'appareil inspecté en marche. Suivre les
instructions d'allumage. Réegler le thermostat de
façon continue.
5. Faire fonctionner le brûleur principal pendant
5 min ensuite, déterminer si le coupe-tirage
déborde à l'ouverture de décharge. Utiliser la
amme d'une allumette ou d'une chandelle ou la
fumée d'une cigarette, d'un cigare ou d'une pipe.
6. Une fois qu'il a été déterminé, selon la méthode
indiquée ci-dessus, que chaque appareil
raccordé au système d'évacuation est mis à l'air
libre de façon adéquate. Remettre les portes
et les fenêtres, les ventilateurs, les registres de
cheminées et les appareils au gaz à leur position
originale.
7. Tout mauvais fonctionnement du système
d'évacuation commun devrait être corrigé
de façon que l'installation soit conforme au
National Fuel Gas Code, ANSI Z223.1/NFPA
54 et (ou) aux codes d'installation CSA-B149.1.
Si la grosseur d'une section du système devrait
être modié, le système devrait être modié pour
respecter les valeurs minimales des tableaux
pertinents de l'appendice F du National Fuel Gas
Code, ANSI Z223.1/NFPA 54 et (ou) les codes
d'installation CSA-B149.1
WARNING
Donotuseopenametocheckforleaks.Anopen
amecouldleadtoexplosion,whichcouldresultin
propertydamage,seriousinjuryordeath.
AVERTISSEMENT
Nerecherchezpaslesfuitesavecuneammenue.
Uneammenuepeutprovoqueruneexplosionqui
peutcauserdesdommagesmatériels,desérieuses
blessurescorporellesoulamort.

Pennant (500-2000)Page 17
DISTANCE FROM GAS METER
OR LAST STAGE REGULATOR
SIZEAND
GASTYPE 0-100' 0-31m 100-200' 31-61m 200-300' 61-91m
500 natural 1-1/2" 3.8cm 2" 5.1cm 2" 5.1cm
500 propane 1" 2.5cm 1-1/2" 3.8cm 1-1/2" 3.8cm
750 natural 2" 5.1cm 2" 5.1cm 2-1/2" 6.4cm
750 propane 1-1/2" 3.8cm 1-1/2" 3.8cm 2" 5.1cm
1000 natural 2" 5.1cm 2-1/2" 6.4cm 3" 7.6cm
1000 propane 1-1/2" 3.8cm 2" 5.1cm 2-1/2" 6.4cm
1250 natural 2-1/2" 6.4cm 2-1/2" 6.4cm 3" 7.6cm
1250 propane 2" 5.1cm 2" 5.1cm 2-1/2" 6.4cm
1500 natural 2-1/2" 6.4cm 3" 7.6cm 3" 7.6cm
1500 propane 2" 5.1cm 2-1/2" 6.4cm 2-1/2" 6.4cm
1750 natural 2-1/2" 6.4cm 3" 7.6cm 3" 7.6cm
1750 propane 2" 5.1cm 2-1/2" 6.4cm 2-1/2" 6.4cm
2000 natural 3" 7.6cm 3" 7.6cm 3-1/2" 8.9cm
2000 propane 2-1/2" 6.4cm 2-1/2" 6.4cm 3" 7.6cm
Notes:
1.Theseguresarebasedon1/2"(0.12kPa)watercolumnpressuredrop.
2.Checksupplypressureandlocalcoderequirementsbeforeproceedingwithwork.
3.Pipettingsmustbeconsideredwhendetermininggaspipesizing.
SECTION 3 Gas Supply and Piping
3.A Gas Supply and Piping
Gas piping should be supported by suitable
hangers or oor stands, not by the appliance.
The Pennant’s gas train allows the user to pipe
the gas from either the right side or the left side of
the unit. As shipped, the right side of the gas train is
capped off, and there is a manual valve on the left side.
If desired, the manual valve on the left side of the gas
train may be moved to the right side, and the cap on
the right side may be moved to the left.
Review the following instructions before
proceeding with the installation.
1. Verify that the appliance is tted for the proper
type of gas by checking the rating plate. Pennant
appliances are equipped to operate at elevations
up to 10,000 feet (3050m). Pennant appliances
may be adjusted to operate properly at altitudes
above 2500 feet (see SECTION 8 on page 73)
and the input will be reduced if the heating value
of the gas supply is below sea level values.
2. The maximum inlet gas pressure must not
exceed 13" w.c. (3.2kPa). The minimum inlet gas
pressure is 5" w.c. (1.2kPa).
3. Refer to Table 7, size supply.
4. Run gas supply line in accordance with all
applicable codes.
5. Locate and install manual shutoff valves in
accordance with state and local requirements.
6. A sediment trap must be provided upstream of
the gas controls.
7. All threaded joints should be coated with
piping compound resistant to action of liqueed
petroleum gas.
8. The appliance and its individual shutoff valve
must be disconnected from the gas supply piping
during any pressure testing of that system at test
pressures in excess of 1/2 PSIG (3.45kpa).
9. The unit must be isolated from the gas supply
system by closing its individual manual shutoff
valve during any pressure testing of the gas
supply piping system at test pressures equal to or
less than 1/2 PSIG (3.45kpa).
10. The appliance and its gas connection must be
leak tested before placing it in operation.
11. Purge all air from gas lines.
Table 7. Gas Piping Size.
NOTE:ThePennantapplianceandallothergas
appliancessharingthegassupplylinemustbering
atmaximumcapacitytoproperlymeasuretheinlet
supplypressure.Thepressurecanbemeasuredat
thesupplypressureportonthegasvalve.Lowgas
pressurecouldbeanindicationofanundersized
gasmeter,undersizedgassupplylinesand/oran
obstructedgassupplyline.

LAARS Heating Systems
Page 18
gravity circulation of the boiler water during the
cooling cycle.
A boiler installed above radiation level, or as
required by the authority having jurisdiction, must be
provided with a low water cutoff device either as a part
of the boiler or at the time of boiler installation.
4.A.3 Water Flow Requirements —Boiler
A hydronic heating (closed loop) application
re-circulates the same uid in the piping system. As a
result, no new minerals or oxygen is introduced into
the system. To ensure a proper operating temperature
leading to long boiler life, a ow rate has been
established based on the uid temperature rise for this
specic size boiler.
Pump-mounted boilers can be ordered for use in
primary secondary piping systems. The pumps used
are sized for the headloss through the heater, plus 30
feet (9.1m) of full-sized piping (same size as boiler
outlet) and a normal number of ttings.
Table 8 species water ow rates for boilers,
which will enable the user to size a pump. The
headloss shown is for the heater only, and the user
will need to add the headloss of the system piping to
properly size the pump.
The minimum inlet water temperature for the
Pennant is 120°F (49°C) to avoid condensing on the
copper coils.
SECTION 4 Water Connections —
BOILER or
WATER HEATER
4.A Boiler
4.A.1 Heating System Piping:
Hot Supply Connections — Boiler
NOTE: Thisappliancemustbeinstalledinaclosed
pressuresystemwithaminimumof12psi(82.7kPa)
staticpressureattheboiler.
Hot water piping should be supported by suitable
hangers or oor stands. Do not support piping with
this appliance. Due to expansion and contraction of
copper pipe, consideration should be given to the type
of hangers used. Rigid hangers may transmit noise
through the system resulting from the piping sliding in
the hangers. It is recommended that padding be used
when rigid hangers are installed. Maintain 1" clearance
to combustibles for hot water pipes.
Pipe the discharge of the relief valve (full size)
to a drain or in a manner to prevent injury in the event
of pressure relief. Install an air purger, an air vent,
a diaphragm-type expansion tank, and a hydronic
ow check in the system supply loop. Minimum ll
pressure must be 12psig (82.7kPa). Install shutoff
valves where required by code.
Suggested piping diagrams are shown in Figures
4 through 8. These diagrams are meant only as a guide.
Components required by local codes must be properly
installed.
NOTE: the recommended location of the
temperature sensor on the diagrams; you must provide
a location for the additional sensor shipped with the
Pennant. This sensor may be strapped onto pipe from
1" to 4" diameter, or inserted into an immersion well.
4.A.2 Cold Water Make-Up — Boiler
1. Connect the cold water supply to the inlet
connection of an automatic ll valve.
2. Install a suitable back ow preventer between the
automatic ll valve and the cold water supply.
3. Install shut off valves where required.
NOTE: Theboiler,whenusedinconnectionwitha
refrigerationsystem,mustbeinstalledsothechilled
mediumispipedinparallelwiththeboilerwith
appropriatevalvestopreventthechilledmediumfrom
enteringtheboiler.
The boiler piping system of a hot water heating
boiler connected to heating coils located in air
handling appliances where they may be exposed to
refrigerated air circulation must be equipped with ow
control valves or other automatic means to prevent
4.A.4 Water Flow Requirements —
Low Temperature Pennant Boilers
are equipped with a mounted pump. The pumps
are sized for the boiler’s head loss and 30 feet of full-
size piping (same size as boiler outlet), with a normal
number of ttings. The boilers must be piped in a
primary-secondary system, such that the boiler’s pump
only serves the boiler. Figure 6 and Figure 7 show
examples of this type of piping.
The minimum inlet water temperature to the
Pennant is 70°F (20°C). The mixing system on the
Pennant will ensure that the heat exchanger in the
Pennant does not see water that is less than 120°F
(49°C), so that excessive condensation does not form
on the heat exchanger.

Pennant (500-2000)Page 19
20°F 25°F 30°F 35°F
SIZE ow H/L ow H/L ow H/L ow H/L
gpm feet gpm feet gpm feet gpm feet
500 43 1.7 34 1.1 28 0.9 24 0.7
750 64 3.3 51 2.3 43 1.7 36 1.2
1000 85 5.0 68 3.6 57 3.1 49 2.2
1250 106 8.1 85 6.1 71 4.7 61 3.4
1500 128 10.0 102 7.2 85 5.5 73 4.2
1750 N/R N/R 119 10.5 99 8.4 85 5.8
2000 N/R N/R 136 12.5 113 10.4 97 8.3
MetricEquivalent
11°C 14°C 17°C 19°C
SIZE ow H/L ow H/L ow H/L ow H/L
lpm m lpm m lpm m lpm m
500 161 0.5 129 0.3 107 0.3 92 0.2
750 241 1.0 193 0.7 161 0.5 138 0.4
1000 321 1.5 257 1.1 214 0.9 184 0.7
1250 401 2.5 322 1.9 269 1.4 231 1.0
1500 483 3.0 386 2.2 322 1.7 276 1.3
 1750 N/R N/R 451 3.2 375 2.6 322 1.8
2000 N/R N/R 515 3.8 429 3.2 368 2.5
Notes:gpm=gallonsperminute,lpm=litersperminute,
H/L=headloss,ft=headlossinfeet,m=headlossinmeters.
Maximumtemperatureriseis35°F(19°C),asshown.
Headlossisforboiler’sheatexchangeronly.
N/R=notrecommended.
Table 8. Water Flow Requirements - Boiler.
Table 8 shows a relationship between water ow
through the boiler and the temperature difference (rise)
between the inlet and outlet of the boiler. This table
will enable the user to test the boiler for proper water
ow. Since the boiler has a mixing system that sends
a portion of the hot water from the boiler outlet to the
boiler inlet, the water ow coming out of the mixing
system will vary, depending on the return water
temperature.
4.A.5 Freeze Protection — Boiler
Boiler installations are not recommended in
areas where the danger of freezing exists unless proper
precautions are made for freeze protection. A non
toxic, heating system, anti-freeze may be added to
the hydronic system provided that the concentration
does not exceed 50% and the anti freeze contains an
anti foamant. When a 50/50 mixture is used, increase
the water ow requirements by 15%, and increase the
headloss requirements by 20%.
Power outage, interruption of gas supply, failure
of system components, activation of safety devices,
etc., may prevent a boiler from ring. Any time a
boiler is subjected to freezing conditions, and the
boiler is not able to re, and/or the water is not able
to circulate, there is a risk of freezing in the boiler
or in the pipes in the system. When water freezes,
it expands. This can result in bursting of pipes in the
system, or damage to the boiler, which could result in
leaking or ooding conditions.
IMPORTANT NOTES: Differentglycolproducts
mayprovidevaryingdegreesofprotection.Glycol
productsmustbemaintainedproperlyinaheating
system,ortheymaybecomeineffective.Consultthe
glycolspecications,ortheglycolmanufacturer,for
informationaboutspecicproducts,maintenance
ofsolutions,andsetupaccordingtoyourparticular
conditions.

LAARS Heating Systems
Page 20
Figure 5. Hydronic Piping — One Boiler, Multi-Temperature System.
PRIMARY/SECONDARY MANDITORY FORALL
VARIABLE FLOW SYSTEMS
INSTALL AIR VENTS AT HIGH POINTS IN SYSTEM
PIPING & SIZING OF EXPANSION TANK
PER TANK MANUFACTURER'S INSTRUCTIONS
DIMENSION "C" (COMMON PIPING) TO BE FOUR
PIPE DIAMETERS, MAX. (NO ELBOWS OR VALVES)
BOILER CIRCUIT PIPING MUST BE EQUAL
TO BOILER WATER CONNECTION SIZE
BOILER CIRC. PUMP SIZED FOR FLOW THROUGH BOILER
DOTTED DEVICES INDICATE ALTERNATE LOCATIONS
PUT BOILER CONTROL SENSOR IN THE SYSTEM
PUMP LOCATION FOR PUMP-MOUNTED UNITS
SYSTEM PUMP
MAKE-UP
COLD WATER
PUMP LOCATION FOR
NON-PUMP-MOUNTED UNITS
SUPPLY WHEN USING THIS PIPING STYLE.
MINIMUM BOILER INLET WATER TEMPERATURE
MUST BE AT LEAST 120°F.
C
C
C
C180°F
180°F
150°F
130°F
NOTES:
1. BOILER LOOP IN EXAMPLE IS MAINTAINED AT 180°F.
2. ZONE THERMOSTATS CAN BE INTERLOCKED WITH BOILER,
SO THAT BOILER FIRES UPON CALL FOR HEAT FROM ANY
ZONE.
3. ZONE PIPING AND INTERLOCK WIRING TO BE DESIGNED
BY SYSTEM ENGINEER.
LEGEND
CHECK VALVE
THERMOMETER
TEMPERATURE
SENSOR
GLOBE VALVE
EXPANSION TANK
WITH AIR SCOOP AND
AUTO AIR VENT
3-WAY VALVE
VALVE
CAUTION: THIS DRAWING SHOWS SUGGESTED
PIPING CONFIGURATION AND VALVING, CHECK
WITH LOCAL CODES AND ORDINANCES FOR
ADDITIONAL REQUIREMENTS.
PRESSURE REDUCING VALVE
W/ FAST FILL BYPASS
PURGE
VALVE
PUMP
SYSTEM RETURN
TEMPERATURE
SENSOR
SYSTEM SUPPLY
TEMPERATURE
SENSOR