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.