Pennant PNCP User manual

Installation and Operation Instructions Document 3178A
H2379900A
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.
Installation and Operation
Instructions for
PENNANT™
Pool Heater
Model PNCP
U.S. Reg. 2,765,423
Sizes 500-2000

Page 2 LAARS Heating Systems
TABLE OF CONTENTS
SECTION 1 General Information ............. 4
1.A Introduction...................................................4
1.A Warranty .......................................................4
1.B ModelIdentication(Nomenclature).............5
1.C Dimensions ...................................................6
1.D Locating the Appliance..................................7
1.E LocatingHeaterwithRespectto
PoolSystemLoop.........................................7
1.F Locating Appliance for Correct Horizontal
Vent/DuctedAirDistFromOutsideWall ......7
1.G InstallationKit ...............................................8
SECTION 2 Venting and
Combustion Air..................... 9
2.A CombustionAir .............................................9
2.A.1 CombustionAirFromRoom .........................9
2.B Venting........................................................10
2.B.1 VentCategories ..........................................10
2.B.2 Category I Vent...........................................10
2.B.3 CommonVentingSystems .........................10
2.A.2 IntakeCombustionAir.................................10
2.B.4 Category III Vent.........................................11
2.C LocatingVent&CombustionAirTerminals.13
2.C.1 SideWallVentTerminal ..............................13
2.C.2 SideWallCombustionAirTerminal.............14
2.C.3 VerticalVentTerminal .................................14
2.C.4 VerticalCombustionAirTerminal ................15
3.B VentTerminalsforOutdoorUnits................15
SECTION 3 Gas Supply and Piping ...... 15
SECTION 4 Water Connections............. 16
4.A Piping..........................................................16
4.B AutomaticChlorinators ...............................17
4.C SensorLocations........................................17
SECTION 5 Electrical Connections......... 8
5.A InstallationWarnings...................................18
5.B LineVoltageConnections...........................18
5.B.1 Main Power.................................................18
5.B.2 PumpPower ...............................................18
5.B.3 PoolHeaterPump .....................................18
5.B.4 AuxiliaryPowerOutput ...............................19
5.C LowVoltageConnections ...........................19
5.C.1 FieldWiring-Inputs....................................19
5.C.1.a SafetyInterlocks .........................................19
5.C.1.b HeatDemands............................................19
5.C.1.c FieldInputs(Open/Closed).........................19
5.C.1.d TemperatureSensors .................................19
5.C.1.e Analog(BAS)Input.....................................19
5.C.2 FieldWiring-Outputs ................................20
5.C.2.a DryContacts ...............................................20
5.C.2.b BASRS485(BACnetMS/TPorModbus)...20
5.C.2.c 24VAC.........................................................20
5.D BASWiringConnections ............................21
5.E WiringDiagram ..........................................22
5.F LadderDiagram..........................................24
SECTION 6 Touchscreen and
System Ops......................... 26
6.A The Home Screen............................... 26
6.A.1 HomeScreenStatusWindow.....................26
6.A.2 HomeScreenActiveIcons..........................27
6.B Lock / Unlock Display Screen........... 28
6.C Keypad Operations ............................ 29
6.D Quick Start ........................................ 30
6.D.1 CH...............................................................30
6.D.1.a CH1.............................................................30
6.D.2 Anti-Short Cycle .........................................30
6.D.3 Time&Date...............................................31
6.E Congure Screen ............................... 32
6.E.1 CH ..............................................................32
6.E.1.a CH1.............................................................32
6.E.2 Pumps........................................................33
6.E.3 TempLimits................................................34
6.E.4 External ......................................................34
6.E.4.a External–RemoteSetPoint ......................35
6.E.4.b ExternalFiringRate....................................35
6.E.5 SettingtheTimeandDate .........................36
6.E.6 Miscellaneous Features ................... 36
6.E.6.a MixingValve.LowTempPennant..............36
6.E.6.b Anti-ShortCycle.........................................37
6.E.6.c COMPort...................................................37
6.E.6.d TemperatureConversion ...........................38

Page 3
Pennant Pool Heater
6.E.6.e FrostProtection .........................................38
6.E.7 Login ..........................................................38
6.F Service Screens ................................. 39
6.F.1 Burner.........................................................39
6.F.2 DigitalI/O(Input/Output)........................39
6.F.3 AnalogI/O...................................................40
6.F.4 ScreenSettings ..........................................40
6.F.5 History.........................................................40
6.F.6 Restart ........................................................41
6.F.7 FactoryReset .............................................41
6.G Messages and USB............................ 41
6.G.1 Messages ...................................................41
6.G.2 USBFunctionality .......................................42
6.H Active Demands ................................. 43
6.I The Navigation Bar ............................ 43
6.J Date and Time Display Area.............. 43
SECTION 7 Sequence of Operation ...... 44
7.A SequenceofOperation...............................44
7.B Shutting Down the Pennant........................45
7.C RestartingthePennant...............................45
SECTION 8 Burner Set Up ..................... 46
8.A SetUpfor0to2500FeetAltitude...............46
8.B SetUpforHighAltitude(>2500Feet)........46
SECTION 9 Maintenance........................ 48
9.A SystemMaintenance ..................................48
9.B ApplianceMaintenanceandCompDesc....48
9.B.1 Burners .......................................................48
9.B.2 Filter............................................................48
9.B.3 GasValves..................................................48
9.B.4 ManualResetHighLimitControl................48
9.B.5 AutomaticResetHighLimitControl............49
9.B.6 Controller....................................................49
9.B.7 Ignitors ........................................................49
9.B.8 IgnitionSensors..........................................49
9.B.9 Transformer ................................................49
9.B.10 Blowers .......................................................49
9.B.11 Flow Switch.................................................50
9.B.12 Heat Exchanger Coil ..................................50
SECTION 10 Trouble Shooting.............. 51
10.A ResolvingLockouts.....................................51
10.B DelayedIgnition—PossibleCauses..........51
10.C Short Cycling — Water Heater....................51
10.D HighGasConsumption...............................51
10.E TroubleshootingErrorsandLockouts.........52
10.F ParameterTables........................................54
10.F.1 Pool Heater.................................................54
10.F.2 ModbusMemoryMap .................................56
10.F.3 BACnetMSTPMemoryMap.......................58
SECTION 11 Replacement Parts ........... 60
11.A GeneralInformation ....................................60
11.B PartsList.....................................................60
11.C PartsIllustrations ........................................66
Congure Screen (continued)

Page 4 LAARS Heating Systems
1.A 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.
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.
SECTION 1 General Information 1.A Introduction
This manual provides information necessary for
the installation, operation, and maintenance of Laars
Heating Systems Pennant copper tube pool heaters.
Read it 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 the 1). American National Standard Z223.1/
NFPA54-Latest Edition “National Fuel Gas Code”
or 2). CAN/CGA 1-B149 “Installation Codes for Gas
Burning Appliances and Equipment” and with the
requirement of the local utility or other authorities
having jurisdiction. Such applicable requirements take
precedence over the general instructions contained
herein.
All electrical wiring is to be done in accordance
with the local codes, or in the absence of local
codes, with: 1). The National Electrical Code ANSI/
NFPA No. 70-latest Edition, or 2). CSA STD. C22.1
“Canadian Electrical Code - Part 1”. This appliance
must be electrically grounded in accordance with these
codes.
WARNING
Thispool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
CAN/CGA-B149.1,NaturalGasInstallationCodeor
CAN/CGA-B149.2,PropaneGasInstallationCode,
and/orlocalcodes.Whererequiredbytheauthority
havingjurisdiction,theinstallationofthisappliance
mustconformtotheStandardforControlsand
SafetyDevicesforAutomaticallyFiredBoilers,
ANSI/ASMECSD-1.Anymodicationstothis
appliance,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
Cechauffe-piscinedoitêtreinstalléconformément
auxprocéduresdécritesdanscemanuel,ou
lagarantiedufabricantpeutêtreannulée.
L'installationdoitêtreconformeauxexigencesde
lajuridictionlocaleayantautorité,et,auxÉtats-
Unis,pourl'éditionlaplusrécenteduNational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chauffe-piscine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.
In the Commonwealth of Massachusetts, this
appliance must be installed by a licensed plumber or
gas tter.

Page 5
Pennant Pool Heater
1.B Model Identication (Nomenclature)
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
 P N C P      A C C 3  
SERIES
P N C
USAGE
P
SIZE
0 5 0 0
0 75 0
1 00 0
1 25 0
1 50 0
1 75 0
2 00 0
FUEL
N
P
ALTITUDE
A
FIRING
MODE
C(ON/OFF)
LOCATION
C
REVISION
3
HEAT
EXCHANGER
B
P
OPTIONS
CODE
X
J
PUMP
OPTIONS
N
B
Consult the rating plate on the unit. The
following information describes the model
number structure.
Model Character Designation
1-3 Model Series Designation
 PNC=Pennant
4 Usage
 P=PoolHeater
5-8 Size
 0500 = 500,000BTU/hinput
 0750 = 750,000BTU/hinput
 1000 = 999,000BTU/hinput
 1250 = 1,250,000BTU/hinput
 1500 = 1,500,000BTU/hinput
 1750 = 1,750,000BTU/hinput
 2000 = 1,999,000BTU/hinput
9 Fuel
 N=NaturalGas
 P=LiquidPropane
10 Altitude
 A=0-10,000feet
11 Location
 C=IndoorandOutdoor
12 Firing Mode
 C=On-off
13 Revision
 3=Thirdversion
14 Heat Exchanger
 B=Glass-linedCI/copper/brztrim
(std.PNCP)
 P=Glass-linedcastiron/cu-nickel/brztrim
15 Option Code
 X=Standardunit
 J=CSD-1,FM,IRI,IL
16 Pump Options
 N=Pumpmounted,TACO,
normalwaterpump
 B=Pumpmounted,B&G,
optionalnormalwaterpump

Page 6 LAARS Heating Systems
Figure 1. Dimensional Data.
SHIPPINGWEIGHT
SIZE lbs. kg
500 775 352
750 870 395
1000 1035 469
1250 1130 513
1500 1285 583
1750 1380 626
2000 1510 685
ØØ
Size A B C DE 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.C Dimensions
MIXING
SYSTEMPIPING
TOUCHSCREEN

Page 7
Pennant Pool Heater
1.D 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.
Pool 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.E Locating Heater with Respect to Pool
System Loop
For the best results, the Pennant should be
located within 15 feet (4.6m) of the pool system loop.
The pump is sized for 30 feet (9.1m) of piping.
If the appliance must be installed with longer
piping runs, then larger diameter piping shall be used.
Consult the factory for assistance.
1.F 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.
   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.

Page 8 LAARS Heating Systems
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.Sensor,Inlet,Temperature,Water 1
10. Label,Box,RemoteSensor 1
1.G Installation Kit
Figure 2. Installation Kit Components
1
2
3
4
5
6
7
8
9
10

Page 9
Pennant Pool Heater
  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.
SECTION 2 Venting and
Combustion Air
2.A Combustion Air
Pennant pool 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 CAN/CGA B149, 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. Never obtain
combustion air from the pool area. Corrosion of and/or
damage to the pool heater may result.
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.

Page 10 LAARS Heating Systems
Figure 3. Combustion Air and Vent Through Roof.
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
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.
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

Page 11
Pennant Pool Heater
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.
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.
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.
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.

Page 12 LAARS Heating Systems
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.

Page 13
Pennant Pool Heater
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.
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.
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:
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.
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.

Page 14 LAARS Heating Systems
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) Acopy 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.
2.C.2 Side Wall Combustion Air Terminal
Never obtain combustion air from the pool area.
Corrosion of and/or damage to the pool heater may
result. The Laars side wall combustion air terminal
(listed in Table 1 on page 7) 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).

Page 15
Pennant Pool Heater
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.
  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.
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.
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 46)
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 on page 16, 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.
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.
3.B 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.

Page 16 LAARS Heating Systems
Table 7. Gas Piping Size.
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 4 Water Connections
4.A Piping
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 shutoff valves where required by
code.Pennant Pool Heaters are equipped with mounted
pumps, which serve the heater plus 30 feet of full-
sized piping with a normal number of ttings. If the
pool’s loop is more than 15 feet away from the heater,
please contact the factory.
A mixing system is mounted on the heater. The
system consists of a three-way valve, temperature
control and piping. The temperature sensor for the
control is in the heater inlet. When the control detects
water temperature that is below 120°F (49°C), it will
direct the three-way valve to actuate, which sends
water from the outlet of the heater back to the inlet.
The outlet water that is diverted to the inlet mixes with
the return water from the pool, and keeps the inlet
temperature at or above 120°F (49°C) (see Figure 5).
This keeps cold return water from causing condensing
on the outside of the Pennant heat exchanger.
Figure 5. Mixing System.

Page 17
Pennant Pool Heater
Figure 6. Pool Heater Piping.
ThePennantPoolHeaterisshippedwithaeld-installedmixingsystem,andmustbepipedinprimary-
secondarystyle,asshown.Aremotepooltemperaturesensorandremotepooltemperaturehighlimit
arewiredtothePennant,tobemountedinthepoolwaterloop,asshown.
IMPORTANT NOTE:Sinceheateroutlettemperatures
canreach150°F(66°C)insomecases,copper
orCPVCarerecommendedmaterialsforheater
connectionpiping.PVCmaterialmaybeusedforthe
inletvalveandthepipingupstreamofit.
When pipe, ttings, grids or any other element
of the lter system are made of plastic materials, they
may be damaged by the momentary “back siphoning”
of hot water from the heater when the lter pump stops
running.
See Figure 6 for proper connection of the
Pennant heater to the pool loop.
4.B Automatic Chlorinators
A concentration of chlorine in the heater can be
very destructive; therefore the following rules about
the installation and operation of such devices must be
followed:
1. The chlorinator should be installed so it
introduces the gas or solution downstream of the
heater.
2. The chlorinator should be wired so it cannot
operate unless the lter pump is operating.
3. The chlorinator should be provided with an anti-
siphon device so that the draining of the piping
after the pump shuts off will not siphon chlorine
solution into the heater.
4. When the operation of a chlorinator is such
that it must be installed in the pump suction, or
some other place where the chlorine solution
ows through the heater, corrosion of the heater
can occur. Excessive concentrations of chlorine
resulting from improper adjustment or chlorinator
equipment failure are responsible for this
corrosion. The heater warranty does not cover the
resulting damage to the heat exchanger.
4.C Sensor Locations
Two sensors must be installed in the pool loop, as
shown in Figure 6 The inlet sensor for the temperature
control must be installed in the pool loop within 12”
(30 cm) of the inlet to the heater. This sensor is not
installed in a well. For sensitivity, it must be installed
in direct contact with the pool water ow. The second
sensor, the high limit sensor, must be installed in the
pool loop within 12” (30 cm) downstream of the heater
outlet. This sensor is a capillary and bulb. It shall be
used with the immersion well that is provided.

Page 18 LAARS Heating Systems
SECTION 5 Electrical Connections
5.A Installation Warnings
WARNING
This appliance must be electrically grounded in
accordance with the requirements of the authority having
jurisdiction or, in the absence of such requirements, with
the latest edition of the National Electrical Code, ANSI/
NFPA 70, in the U.S. and with the latest edition of CSA
C22.1 Canadian Electrical Code, Part 1, in Canada. Do
not rely on the gas or water piping to ground the metal
parts of the boiler. Plastic pipe or dielectric unions may
isolate the boiler electrically. Service and maintenance
personnel, who work on or around the boiler may be
standing on wet oors could be electrocuted by an
ungrounded boiler. Electrocution can result in severe
injury or death.
Single pole switches, including those of safety
controls and protective devices, must not be wired in a
grounded line.
All electrical connections are made at the power
terminals, which are located at the rear of the appliance,
or at the input/output terminal strips which are located on
the right side of the appliance.
All internal electrical components have been
prewired. No attempt should be made to connect
electrical wires to any other location except the terminal
blocks.
5.B Line Voltage Connections
Incoming power must be protected by the
appropriate circuit breaker (fuse) and installed by a
qualied electrician or authorized/qualied personnel.
Recommended over current protection ratings are
shown in Table 3 on page 11.
5.B.1 Main Power
All non-pump mounted Pennants require a
single 120-volt supply. Pump mounted Pennant
sizes 500-1500 also use a single 120-volt supply, and
Pennant sizes 1750-2000 require two separate 120-volt
supplies.
Pennant sizes 500-1500 main power (L1, N1, and
Ground) shall be connected to the three wires supplied.
This main power circuit is identied by three solid
colored wires (10 AWG) – black (L1), white (N1), and
green (Ground).
Pennant sizes 1750-2000 main power (L1,
N1, and Ground) is identied by three solid colored
wires (10 AWG) – black (L1), white (N1), and green
(Ground). The pump circuit is identied by three 12
AWG wires, as outlined in the next Section.
5.B.2 Pump Power
The pump circuit is identied by three 12 AWG
wires: black with a white stripe (L2), white (N2), and
green (Ground).
If desired, an installer can change the pump
mounted single service units to use a separate circuit
for the pump. Instructions to make this change are
found in the next Section.
5.B.3 Pool Heater Pump
Conversion to a separate pump circuit requires
bringing in a separate circuit for the pump and
removing the three jumper wires within the internal
wiring of the 120-volt portion of the Pennant (see
Figure 3). This action should only be performed by
qualied personnel, with the power disconnected from
the unit.
To rewire the pump circuit, bring in a separate
120-volt circuit (L2, N2, and Ground). Remove
the jumper wires shown in Figure 3. Connect the
incoming line voltage (L2) to the main power switch
using a ¼” female insulated push on terminal. From
the other side of the main power switch, connect to
the main power terminal block, in the rear of the unit,
using a ¼” female insulated push on terminal. This
will be in the same position where the line voltage
jumper terminated. Connect N2 and Ground to the
main terminal block, in the rear of the unit, using ¼”
female insulated push terminals. These connections
will also be the same positions where the neutral and
ground jumpers were terminated.
Over Current Recommendations (Amps)
Pennant
Pump Only
Size
Without
Pump
With
Pump
Taco
B & G
500
15
20
15
15
750
15
20
15
15
1000 20
25 –Taco
30 – B & G
15 15
1250
25
30
15
15
1500
25
30
15
15
1750
25
–
15
20
2000
25
–
20
20
Table 10 – Circuit Protection
Table 8. Circuit Protection

Page 19
Pennant Pool Heater
Figure 7. Removing Jumpers.
5.B.4 Auxiliary Power Output
The Auxiliary Power Output, if used, is controlled
by Field Input 2. When Field Input 2 is closed,
line voltage is supplied at terminal 7 and neutral on
terminal 8 of the output terminal strip. This output is
rated for 250VAC, 2.5A maximum.
5.C Low Voltage Connections
Route all wires through the knockouts on the right side
of the Pennant. Connect low voltage wiring to the
input and output terminals shown in Figure 8. Connect
all wiring as shown on the wiring diagram.
5.C.1 Field Wiring - Inputs
5.C.1.a Safety Interlocks
Field Interlock: If the Field Interlock is utilized,
remove the jumper from the terminals 1 and 2 of the
input terminal strip and wire the interlock to these
terminals. Only dry contacts can be connected to the
Field Interlock terminals.
NOTE: Safety chain voltage is 24VDC.
5.C.1.b Heat Demands
CH1: Connect the thermostat/aquastat or end switch
(isolated contact only) wires to terminals 3 and 4 of the
input terminal strip.
NOTE: The heat demand contacts must be dry
contacts. The Pennant controller heat demand voltage
is 24VDC.
5.C.1.c Field Inputs (Open/Closed)
Field Input 1: Field Input 1, if used, is connected
across terminals 9 and 10 of the input terminal strip.
When connected, Field Input 1 controls the Auxiliary
Dry Contact. If Field Input 1 is open, the Auxiliary
Dry Contact is open. If Field Input 1 is closed, the
Auxiliary Dry Contact is closed. Only dry contacts
can be connected to Field Input 1.
Field Input 2: Field Input 2, if used, is connected
across terminals 11 and 12 of the input terminal strip.
When connected, Field Input 2 controls the Auxiliary
Power Output. If Field Input 2 is open, the Auxiliary
Power Output is off. If Field Input 2 is closed, the
controller turns power on at the Auxiliary Power
Output.
NOTE: The controller applies 24VDC to the Field
Inputs to detect the status of the contacts.
5.C.1.d Temperature Sensors
System Supply: The system supply sensor, supplied
in the installation kit, is connected to terminals 13, 14
and 15 of the input terminal strip. When connected,
the controller automatically detects the presence of
this sensor. The system supply temperature is shown
on the home screen above the red system input arrow.
See Figure This sensor is supplied loose with the
Pennant and is installed in the piping or tank per the
suggested piping diagrams.
System Return: The system return sensor, supplied in
the installation kit, is connected to terminals 16 and 17
of the input terminal strip. The controller automatically
detects the presence of this sensor. The heater controls
to this temperature sensor. This temperature is shown
on the home screen above the blue system output
arrow. This sensor is supplied loose with the Pennant
and is installed in the piping or tank per the suggested
piping diagrams.
5.C.1.e Analog (BAS) Input
Building Automation System (BAS): The BAS input,
if used, is connected to terminals 22 and 23 of the
input terminal strip. When making the connection,
adhere to the polarity designations shown on the label
or wiring diagram. The input signal can be
0 – 10 VDC or 4 – 20 mA, and can be used to control
the ring rate or set point, refer to 6.E.4 on page 34.
The factory default setting is for a 0 – 10VDC signal.
Congure for 4 – 20 mA by placing a jumper on CN20
on the control board, see Figure 5.

Page 20 LAARS Heating Systems
5.C.2 Field Wiring - Outputs
5.C.2.a Dry Contacts
Run: These contacts, when used, are connected to
terminals 1 (common), 2 (normally closed), and 3
(normally open) of the output terminal strip. The
controller closes the normally open set of contacts
whenever the Pennant is running. This is typically
used by a BAS to verify the Pennant is satisfying
a heat demand. Contact ratings are 250VAC, 0.6A
maximum.
Alarm: These contacts, when used, are connected
to terminals 4 (common), 5 (normally closed), and
6 (normally open) of the output terminal strip. The
controller closes the normally open set of contacts
whenever the Pennant is locked out or power is turned
off. Contact ratings are 250VAC, 0.6A maximum.
System Pump: When connecting a system pump, use
terminals 11 and 12 of the output terminal strip. As
this is a dry contact, the system pump contact must
be wired with either the system pump supply voltage
or the system pump relay coil voltage. System pump
functionality is congured using the touch screen.
Contact ratings are 250VAC, 1.5A maximum.
AUX: These contacts, when used are connected to
terminals 13 and 14 of the output terminal strip. The
controller closes this contact when Field Input 1 is
closed; otherwise, this contact remains open. Contact
ratings are 250VAC, 1.5A maximum.
Figure 8. Input and Output Terminal Strips
Detail
5.C.2.b BAS RS485 (BACnet MS/TP or
Modbus)
These terminals, when used, are for RS485 serial
communication with a BAS system using BACnet
MS/TP or Modbus protocols. Use 2-wire twisted pair,
shielded w/drain, communication cable between the
BAS and Pennant.
5.C.2.c 24VAC
There are terminals for 24VAC on the output terminal
strip. These terminals are reserved for Pennant low-
temp units or a low water cuto-off option kit.