Pentair MASTERTEMP 125 User manual

MASTERTEMP™125 POOL AND SPA HEATER
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FOR
YOUR
SAFETY
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FOR YOUR SAFETY - This product must be installed and serviced by authorized personnel, qualified in pool/spa
heater installation. Improper installation and/or operation can create carbon monoxide gas and flue gases which can
cause serious injury, property damage, or death. For indoor installations, as an additional measure of safety, Pentair
Water Pool and Spa strongly recommends installation of suitable Carbon Monoxide Detectors in the vicinity of this
appliance and in any adjacent occupied spaces. Improper installation and/or operation will void the warranty.
FOR YOUR SAFETY - READ BEFORE OPERATING
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OWNER:
Retain For
Future
Reference
Model MT125 HD Natural Propane
125K (33 kW) with cord 461092 461093
240 VAC NATURAL GAS/LP GAS
INSTALLATION AND USER’S GUIDE (AUSTRALIA)
0ENTAIR7ATER0OOLAND3PA)NC!USTRALIAn-ONASH$RIVE$ANDENONG3OUTH6ICTORIAn!USTRALIAss&AX
0ENTAIR7ATER0OOLAND3PA)NC53! (AWKINS!VE3ANFORD.#53!ss
7,OS!NGELES!VE-OORPARK#!53!ss
s)FYOUDONOTFOLLOWTHESEINSTRUCTIONSEXACTLYAlREOREXPLOSIONMAYRESULTCAUSINGPROPERTY
damage, personal injury or loss of life.
s)MPROPERINSTALLATIONADJUSTMENTALTERATIONSERVICEORMAINTENANCECANCAUSEPROPERTY
damage, personal injury or death. Installation and service must be performed by a qualified
installer, service agency or the gas supplier.
s$ONOTPLACEARTICLESORAGAINSTTHISAPPLIANCE
s$ONOTUSEORSTOREmAMMABLEMATERIALSNEARTHISAPPLIANCE
s$ONOTSPRAYAEROSOLSINTHEVICINITYOFTHISAPPLIANCEWHILEITISINOPERATION
FOR YOUR SAFETY
www.pentairpool.com.au - www.pentairpool.com - www.staritepool.com
WHAT TO DO IF YOU SMELL GAS
®Rainbow Pool Products
PO Box 2388, Mansfield Qld 4122
Telephone STD 61-7-3849 5385
Facsimile STD 61-7-3849 5384
Email: [email protected]
Web: www.rainbowpoolproducts.com.au

MASTERTEMP™ 125 Pool and Spa Heater Installation and User’s Guide P/N 460906 Rev. B 5/2014
|
i | Code Requirements / References
Customer Service
If you have questions about ordering Pentair Aquatic Systems replacement parts, and pool products,
please use the following contact information.
Customer Service and Technical Support, AUS (AEST Time)
Phone: [phone]
Fax: [phone]
Victoria, AUS (AEST Time)
Phone: [phone]
.ATIONAL$EALER,OCATOR
Phone: [phone]
[e-mail]
Pentair Aquatic Systems AU/NZ – Head Office:
-ONASH$RIVE$ANDENONG3OUTH6ICTORIAn!USTRALIAss&AX
Pentair Aquatic Systems USA:
(AWKINS!VE3ANFORD.#n53!sOR
7EST,OS!NGELES!VE-OORPARK#!n53!sOR
Web site: www.pentair.com.au
Customer Service and Technical Support, USA (8 A.M. to 4:30 P.M. Eastern/Pacific Times)
Phone: [phone]
Fax: [phone]
Sanford, North Carolina, USA (8 A.M. to 4:30 P.M. — Eastern Time)
Phone: [phone]
Fax: [phone]
Moorpark, California, USA (8 A.M. to 4:30 P.M. — Pacific Time)
Phone: [phone]
Fax: [phone]
®Rainbow Pool Products
PO Box 2388, Mansfield Qld 4122
Telephone STD 61-7-3849 5385
Facsimile STD 61-7-3849 5384
Email: [email protected]
Web: www.rainbowpoolproducts.com.au

P/N 460906 Rev. B 5/2014 MASTERTEMP™ 125 Pool and Spa Heater Installation and User’s Guide
|
Contents
(EATER)DENTIlCATION)NFORMATION().#ODE2EQUIREMENTS2EFERENCES ..................................................................................................... ii - iii
(EATER)DENTIlCATION)NFORMATION().............................................................................................................................................................. iii
Warnings and Safety Instructions / Consumer Information / General Specifications .............................................................................. iv - viii
Operating the Control Panel..................................................................................................................................................... ix
Section 1. Operation Instructions......................................................................................................... 1
Operating Instructions / Basic System Operation........................................................................................................................... 1
Heater HSI (Hot-Surface Ignition) Lighting/Operation .................................................................................................................... 1
Start-up and Operation / Before You Start ....................................................................................................................................... 1
Operating Instructions ....................................................................................................................................................................... 2
To Turn Off Gas to Appliance ............................................................................................................................................................ 2
Safety Controls: Air Flow Switch (AFS) / Water Pressure Switch / High Limit Devices............................................................... 3
Operation of Ignition Module............................................................................................................................................................. 4
Temperature Setting / Adjust The Maximum Temperature Set Point............................................................................................. 4
Section 2. Installation Instructions....................................................................................................... 5
 (EATER$ESCRIPTION................................................................................................................................................................................ 5
 3EQUENCEOF/PERATION......................................................................................................................................................................... 5
 0UTTINGTHE(EATERINTO3ERVICE............................................................................................................................................................. 
 3PECIlCATIONS ....................................................................................................................................................................................... 
 0LUMBING#ONNECTIONS.......................................................................................................................................................................... 7
 7ATER#ONNECTIONS ............................................................................................................................................................................... 7
Valves ................................................................................................................................................................................................... 
Manual By-Pass ................................................................................................................................................................................... 
Below Pool Installation ......................................................................................................................................................................... 
 'AS#ONNECTIONS'AS,INE)NSTALLATION .............................................................................................................................................. 
 3EDIMENT4RAP$RIP,EG....................................................................................................................................................................... 
 4ESTING'AS,EAKSAND'AS0RESSURE .................................................................................................................................................. 
 )NLET'AS0RESSURE2EQUIREMENTS ........................................................................................................................................................ 
 /UTDOOR)NSTALLATION(EATER#LEARANCES ............................................................................................................................................. 11 - 12
)NDOOR6ENTING'ENERAL2EQUIREMENTS(EATER#LEARANCES/UTSIDE6ENTCOVER2EMOVAL ........................................................ 13
 #OMBUSTION!IR3UPPLY#ORROSIVE6APORSAND0OSSIBLE#AUSES .................................................................................................... 
 6ENT)NSTALLATION)NDOOR)NSTALLATIONOR/UTDOOR3HELTER6ERTICAL6ENTING..................................................................................... 15-17
 (ORIZONTALOR6ERTICAL6ENTING5SING3INGLE7ALL3TAINLESS'AS6ENT........................................................................................... 
 #ONNECTING3INGLE7ALL3TAINLESS3TEEL6ENTTOTHE(EATER.............................................................................................................. 
 (ORIZONTALOR6ERTICAL6ENTING&LEXIBLE$UCT&LEX6ENT .................................................................................................................. 21
 #ONTROL0ANEL)NDEXING ......................................................................................................................................................................... 22
 &INAL)NSTALLATION#HECK ........................................................................................................................................................................ 22
 %LECTRICAL#ONNECTIONS .......................................................................................................................................................................... 23
 &IREMANS3WITCH#ONNECTION2EMOTE#ONTROL#ONNECTIONS................................................................................................................ 
 (EATER7IRING$IAGRAM(EATER%LECTRICAL3CHEMATIC,ADDER$IAGRAM ............................................................................................... 
Section 3. Troubleshooting.................................................................................................................... 27
 )NITIAL4ROUBLESHOOTINGAND4ROUBLESHOOTING#HART ............................................................................................................................... 27
 (EATER7ILL.OT&IRE4ROUBLESHOOTING!"#$ ................................................................................................................................ 
 ,%$$IAGNOSTICS!'3!&3(,3034HERMISTOR ............................................................................................................................. 32 - 33
 "URNER(EAT%XCHANGER4ROUBLESHOOTING ........................................................................................................................................... 
Section 4. Maintenance Instructions.................................................................................................... 35
 #AREAND-AINTENANCE ......................................................................................................................................................................... 35
 $E,IMITINGTHE(EATER.......................................................................................................................................................................... 35
 0RESSURE2ELIEF6ALVE ........................................................................................................................................................................... 35
 !FTER3TART5P........................................................................................................................................................................................ 
 #HECK7ATER&LOW ................................................................................................................................................................................ 
 3PRING&ALL!UTUMNAND7INTER/PERATION ....................................................................................................................................... 
 -AINTAINING0OOL4EMPERATURE%NERGY3AVING4IPS ............................................................................................................................ 37
 #HEMICAL"ALANCE.................................................................................................................................................................................
 2EPLACEMENT0ARTS ...............................................................................................................................................................................
ii
Contents

MASTERTEMP™ 125 Pool and Spa Heater Installation and User’s Guide P/N 460906 Rev. B 5/2014
|
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1) MT : MasterTemp
2) Model Size : 125 : Input rating (Mega Joule [MJ]/hr)
3) Construction : (HD = Heavy Duty Model)
4) Fuel Type : (LP = Propane gas or NG = Natural gas)
MT 125 HD
MT = MASTERTEMP
MODEL SIZE =MJ INPUT= Mega Joule [MJ] / HR
H. I. N.
HEATER IDENTIFICATION NUMBER
ID DESIGNATOR FOR PENTAIR WATER POOL AND SPA
MASTERTEMP™ 125 HEATER
Example:
123 4
FUEL TYPE = NG = NATURAL GAS
LP = PROPANE GAS
125 (125 MJ /HR)
HD = HEAVY DUTY MODEL
NG
Heater Identification Information
Heater Identification Information
HEATER IDENTIFICATION INFORMATION — (HIN)
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Heater Data Rating Plate Location
Door Acess Panel
Top Panel
Door Acess Panel
iii
PENTAIR WATER POOL AND SPA, INC.

P/N 460906 Rev. B 5/2014 MASTERTEMP™ 125 Pool and Spa Heater Installation and User’s Guide
|
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IMPORTANT NOTICES
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
WARRANTY INFORMATION
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CAUTION
OPERATING THIS HEATER CONTINUOUSLY AT WATER TEMPERATURE BELOW 20° C (68° F). WILL CAUSE HARMFUL
CONDENSATION AND WILL DAMAGE THE HEATER AND VOID THE WARRANTY. Do not use the heater to protect pools
or spas from freezing if the final maintenance temperature desired is below 20° C (68° F), as this will cause condensation
related problems.
Warning and Safety Instructions
IMPORTANT SAFETY INSTRUCTIONS
READ AND FOLLOW ALL INSTRUCTIONS
SAVE THESE INSTRUCTIONS
MasterTemp™125 High Performance Heater
iv
Warning and Safety Instructions

MASTERTEMP™ 125 Pool and Spa Heater Installation and User’s Guide P/N 460906 Rev. B 5/2014
|
WARNING
Should overheating occur or the gas supply fail to shut off, turn off the manual gas control valve to the heater.
Do not use this heater if any part has been under water. Immediately call a qualified service technician to
inspect the heater and to replace any part of control system and gas control which has been under water.
CONSUMER INFORMATION AND SAFETY
WARNING
The Consumer Product Safety Commission warns that elevated water temperature can be hazardous. See below for
water temperature guidelines before setting temperature.
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DANGER
CARBON MONOXIDE GAS IS DEADLY – %XHAUSTFROMTHISPOOLHEATERCONTAINSTOXICLEVELSOFCARBONMONOXIDEADANGEROUS
poisonous gas you cannot see or smell.
vWarnings and Safety Instructions
CODE REQUIREMENTS
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P/N 460906 Rev. B 5/2014 MASTERTEMP™ 125 Pool and Spa Heater Installation and User’s Guide
|
GENERAL SPECIFICATIONS
NOTICE:
s #OMBUSTIONAIRCONTAMINATEDBYCORROSIVECHEMICALFUMESCANDAMAGETHEHEATERANDWILLVOIDTHEWARRANTY
s 4HE#OMBINATION'AS#ONTROL6ALVEONTHISHEATERDIFFERSFROMMOSTAPPLIANCEGASCONTROLS)FITMUSTBEREPLACED
FORSAFETYREASONSREPLACEITONLYWITHANIDENTICALGASCONTROL
s 4HEACCESSDOORPANELSMUSTBEINPLACETOPROVIDEPROPERVENTILATION$ONOTOPERATETHEHEATERFORMORETHANlVE
minutes with the access door panels removed.
s 4HISHEATERISDESIGNCERTIlEDBY)!0-/ASCOMPLYINGWITHTHE3TANDARDFOR'AS&IRED0OOL(EATERSANDISINTENDED
FORUSEINHEATINGFRESHWATERSWIMMINGPOOLSORSPAS
s 4HEHEATERISDESIGNEDFORTHEHEATINGOFCHLORINEBROMINEORSALTSYSTEMSWIMMINGPOOLSANDSPAS)TSHOULDNOT be
USEDASASPACEHEATINGBOILERORGENERALPURPOSEWATERHEATER4HEHEATERREQUIRESANEXTERNAL240 VAC
single-phase electric power source.
s 4HEHEATERSHOULDBELOCATEDINANAREAWHERELEAKAGEOFTHEHEATERORCONNECTIONSWILLNOTRESULTINDAMAGETOTHE
area adjacent to the heater or to the structure. When such locations cannot be avoided, it is recommended that a
SUITABLEDRAINPANADEQUATELYDRAINEDBEINSTALLEDUNDERTHEHEATER4HEPANMUSTNOTRESTRICTAIRmOW
s 4HEHEATERMAYNOTBEINSTALLEDWITHIN-FTOFTHEINSIDESURFACEOFAPOOLORSPAUNLESSITISSEPARATEDBYASOLID
FENCEWALLOROTHERPERMANENTBARRIER
CONSUMER INFORMATION AND SAFETY (CONTINUED)
WARNING
The Consumer Product Safety Commission warns that carbon monoxide is an “invisible killer”. Carbon monoxide is a
colorless and odorless gas.
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vi
Warning and Safety Instructions

MASTERTEMP™ 125 Pool and Spa Heater Installation and User’s Guide P/N 460906 Rev. B 5/2014
|
The MasterTemp 125 (EATERISDESIGNEDANDMANUFACTUREDTOPROVIDEMANYYEARSOFSAFEANDRELIABLESERVICEWHENINSTALLED
OPERATEDANDMAINTAINEDACCORDINGTOTHEINFORMATIONINTHISMANUAL4HROUGHOUTTHISMANUALSAFETYWARNINGSANDCAUTIONS
AREIDENTIlEDBYTHEhhSYMBOL"ESURETOREADANDCOMPLYWITHALLOFTHEWARNINGSANDCAUTIONS
WARNING — This heater is equipped with an unconventional gas control valve that is factory set with a
manifold pressure of of 11 ± 5 Pa. Improper installation, adjustment, alteration, service or maintenance
CANCAUSEPROPERTYDAMAGEPERSONALINJURYORLOSSOFLIFE)NSTALLATIONORSERVICEMUSTBEPERFORMEDBY
AQUALIlEDINSTALLERSERVICEAGENCYORTHEGASSUPPLIER)FTHISCONTROLISREPLACEDITMUSTBEREPLACED
with an identical control.
Do not attempt to adjust the gas flow by adjusting the regulator setting.
WARNINGS AND SAFETY INSTRUCTIONS
CARBON MONOXIDE GAS IS DEADLY
READ OWNERS MANUAL COMPLETELY BEFORE OPERATING
4()3 02/$5#4 -534 "% ).34!,,%$ !.$ 3%26)#%$ "9 ! 02/&%33)/.!, 3%26)#%
4%#(.)#)!. 15!,)&)%$ ). 0//, (%!4%2 ).34!,,!4)/. 3OME JURISDICTIONS REQUIRE THAT
INSTALLERSBELICENSED#HECKWITHYOURLOCALBUILDINGAUTHORITYABOUTCONTRACTORLICENSINGREQUIREMENTS
)MPROPERINSTALLATIONANDOROPERATIONCOULDCREATECARBONMONOXIDEGASANDmUEGASESWHICHCOULD
CAUSESERIOUSINJURYORDEATH)MPROPERINSTALLATIONANDOROPERATIONWILLVOIDTHEWARRANTY
 %XHAUSTFROMTHISPOOLHEATERCONTAINSTOXICLEVELSOFCARBONMONOXIDEADANGEROUSPOISONOUSGAS
YOUCANNOTSEEORSMELL3YMPTOMSOFCARBONMONOXIDEEXPOSUREORPOISONINGINCLUDEDIZZINESS
HEADACHENAUSEAWEAKNESSSLEEPINESSMUSCULARTWITCHINGVOMITINGANDINABILITYTOTHINKCLEARLY
)&9/5%80%2)%.#%!.9/&4(%!"/6%39-04/-3)--%$)!4%,9452./&&4(%0//,
(%!4%2,%!6%4(%6)#).)49/&4(%0//,/230!!.$'%4).4/&2%3(!)2)--%$)!4%,9
4(%0//, (%!4%2-534"%4(/2/5'(,94%34%$"9!'!302/&%33)/.!, "%&/2%
2%35-).'/0%2!4)/.
EXCESSIVE CARBON MONOXIDE EXPOSURE CAN CAUSE BRAIN DAMAGE OR DEATH.
s.%6%2USETHISPOOLHEATERINDOORSWITHOUTSPECIlEDVENTILATIONSYSTEMANDPROPERLYINSTALLED
VENTPIPE
s.%6%2USETHISPOOLHEATERINTHEHOMEORINPARTLYENCLOSEDAREASSUCHASGARAGESUNLESS 
THESPECIlEDVENTILATIONSYSTEMISUSED)FUSEDOUTDOORSINSTALLFARFROMOPENWINDOWSDOORS
vents and other openings.
s 0ENTAIR STRONGLY RECOMMENDS THAT ALL VENTS PIPES AND EXHAUST SYSTEMS BE INITIALLY AND
PERIODICALLYTESTEDFORPROPEROPERATION4HISTESTINGCANBEACCOMPLISHEDBYUSINGAHANDHELD
CARBONMONOXIDEMETERANDORBYCONSULTINGWITHAGASPROFESSIONAL
s 0OOL HEATERS MUST BE USED IN CONJUNCTION WITH CARBON MONOXIDE DETECTORS INSTALLED NEAR THE
POOLHEATER4HECARBONMONOXIDEDETECTORSMUSTBEPERIODICALLYINSPECTEDFORPROPEROPERATIONSO
DANGER —
WARNING — FOR YOUR SAFETY
 4HISPRODUCTMUSTBEINSTALLEDANDSERVICEDBYAPROFESSIONALSERVICETECHNICIANQUALIlEDINPOOL
HEATERINSTALLATION3OMEJURISDICTIONSREQUIRETHATINSTALLERSBELICENSED#HECKWITHYOURLOCALBUILDING
AUTHORITYABOUTCONTRACTORLICENSINGREQUIREMENTS)MPROPERINSTALLATIONANDOROPERATIONCOULDCREATE
CARBONMONOXIDEGASANDmUEGASESWHICHCOULDCAUSESERIOUSINJURYORDEATH)MPROPERINSTALLATION
ANDOROPERATIONWILLVOIDTHEWARRANTY
vii Warnings and Safety Instructions

P/N 460906 Rev. B 5/2014 MASTERTEMP™ 125 Pool and Spa Heater Installation and User’s Guide
|
WARNINGS AND SAFETY INFORMATION (CONTINUED)
WARNING — Risk of fire or explosion from incorrect fuel use or faulty fuel conversion. Do not try to run a
HEATERSETUPFORNATURALGASONPROPANEGASORVICEVERSA/NLYQUALIlEDSERVICETECHNICIANSSHOULD
ATTEMPTTOCONVERTHEATERFROMONEFUELTOTHEOTHER$ONOTATTEMPTTOALTERTHERATEDINPUTORTYPEOF
GASBYCHANGINGTHEORIlCE)FITISNECESSARYTOCONVERTTOADIFFERENTTYPEOFGASCONSULTYOUR0ENTAIR
DEALER3ERIOUSMALFUNCTIONOFTHEBURNERCANOCCURWHICHMAYRESULTINLOSSOFLIFE!NYADDITIONS
CHANGESORCONVERSIONSREQUIREDINORDERFORTHEAPPLIANCETOSATISFACTORILYMEETTHEAPPLICATIONNEEDS
MUSTBEMADEBYA0ENTAIRDEALEROROTHERQUALIlEDAGENCYUSINGFACTORYSPECIlEDANDAPPROVED
PARTS4HEHEATERISAVAILABLEFORUSEWITHNATURALGASOR,0PROPANEGASONLY)TISNOTDESIGNEDTO
OPERATEWITHANYOTHERFUELS2EFERTOTHENAMEPLATEFORTHETYPEOFGASTHEHEATERISEQUIPPEDTOUSE
 s 5SEHEATERONLYWITHTHEFUELFORWHICHITISDESIGNED
 s )F A FUEL CONVERSION IS NECESSARY REFER THIS WORK TO A QUALIlED SERVICE TECHNICIAN OR GAS SUPPLIER 
 BEFOREPUTTINGTHEHEATERINTOOPERATION
WARNING — Risk of explosion if unit is installed near propane gas storage.0ROPANE,0GASISHEAVIERTHAN
AIR#ONSULTLOCALCODESANDlREPROTECTIONAUTHORITIESABOUTSPECIlCINSTALLATIONREQUIREMENTSAND
RESTRICTIONS,OCATETHEHEATERAWAYFROMPROPANEGASSTORAGEANDlLLINGEQUIPMENTASSPECIlEDBY
THE3TANDARDFORTHE3TORAGEAND(ANDLINGOF,IQUElED0ETROLEUM'ASESLATESTEDITION
WARNING — Risk of fire. Do not place articles on, near or against the heater.
WARNING — Risk of burn hazard.4OREDUCETHERISKOFINJURYDONOTTOUCHTHESIDEHEATERVENTCOVERWHENTHE
HEATERISOPERATING3IDEHEATERVENTCOVERSARE(/4ANDCANBURNWHENTOUCHEDCAUSINGPERSONAL
INJURY$ONOTALLOWCHILDRENTOPLAYONORAROUNDHEATERORASSOCIATEDEQUIPMENT The average
temperature of the heaters flue exhaust is 204 degrees Celsius (°C).
WARNING — Risk of asphyxiation if exhaust is not correctly vented. Follow venting instructions exactly
when installing heater.$ONOTUSEADRAFTHOODWITHTHISHEATERASTHEEXHAUSTISUNDERPRESSURE
FROMTHEBURNERBLOWERANDADRAFTHOODWILLALLOWEXHAUSTFUMESTOBLOWINTOTHEROOMHOUSINGTHE
HEATER4HEHEATERISSUPPLIEDWITHANINTEGRALVENTINGSYSTEMFOROUTDOORINSTALLATION
CAUTION — Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper
and dangerous operation. Wiring errors can also destroy the control board.
 s #ONNECTHEATERTO2406OLT(Z3INGLE0HASEPOWERONLY
 s 6ERIFYPROPEROPERATIONAFTERSERVICING
 s $ONOTALLOWCHILDRENTOPLAYONORAROUNDHEATERORASSOCIATEDEQUIPMENT
 s .EVERALLOWCHILDRENTOUSETHEPOOLORSPAWITHOUTADULTSUPERVISION
 s 2EAD AND FOLLOW OTHER SAFETY INFORMATION CONTAINED IN THIS MANUAL PRIOR TO OPERATING THIS POOL 
heater.
Vent
Cover
viii
Warning and Safety Instructions

MASTERTEMP™ 125 Pool and Spa Heater Installation and User’s Guide P/N 460906 Rev. B 5/2014
|
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 VSDWHPSHUDWXUHVHWWLQJ
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WARNING
Risk of explosion or fire causing burns or death if safety interlocks are disabled. DO NOT attempt to operate heater when
3%26)#%(%!4%2LIGHTISONORIFBLOWERORBURNERWILLNOTSTART)NSTEADFOLLOWINSTRUCTIONSUNDERh4O3WITCH/FF'ASTOTHE
!PPLIANCEvANDCALLAQUALIlEDSERVICETECHNICIANTOREPAIRUNIT
Temperature
Up and Down
Digital Temperature
Display
System Operation
Indicator Lights
Dual Temperature
Controls
Heater "OFF"
Switch
OPERATING THE CONTROL PANEL
Operating the Control Panel
ix

P/N 460906 Rev. B 5/2014 MASTERTEMP™ 125 Pool and Spa Heater Installation and User’s Guide
| 1
BASIC SYSTEM OPERATION
Start pump, make sure the pump is running and is primed, to close the water pressure switch and supply power to heater.
Be sure the pool and/or spa is properly filled with water. Follow the Lighting/Operating instructions below.
Section 1: Operation Instructions
FOR YOUR SAFETY: READ BEFORE LIGHTING
START-UP AND OPERATION
HEATER HSI ELECTRONIC IGNITION LIGHTING/OPERATION
If you do not follow these instructions exactly, a fire or explosion may result
causing property damage, personal injury or loss of life.
Do not attempt to light the heater if you suspect a gas leak. Lighting the heater
can result in a fire or explosion which can cause personal injury, death, and
WARNING
BEFORE START-UP
A. This appliance does not have a pilot. It is equipped
with an ignition device which automatically lights the
burners. Do not try to light the burners by hand.
B. BEFORE OPERATING, smell all around the appliance
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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 neighbor’s
phone. Follow the gas supplier’s instructions.
– If you cannot reach your gas supplier, call the Fire
Department.
C. Use only your hand to turn the gas control on or off.
Never use tools. If you cannot change the ON/OFF
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service technician. Forced or attempted repair may result
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D. Do not use this heater if any part has been under water.
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the heater and to replace any part of the control system
and any gas control which has been under water.
E. Do not operate the pool heater unless the pool or spa is
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after it has been off for an extended time, perform the
following checklist:
1. Remove debris or other articles from inside the heater
and the area around the heater and its exhaust vent.
Make sure the ventilation openings are clear of debris
or obstruction. For installations in an enclosed space,
make sure openings for combustion and ventilation
air are unobstructed.
2. Keep heater area clear and free from combustibles,
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3. Check that all water connections are tight.
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unobstructed from the appliance. When operating
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the system.
Section 1: Operation Instructions
START-UP AND SHUTDOWN INSTRUCTIONS ARE ON THE LABEL ATTACHED TO THE COVER OF THE APPLIANCE
CONTROL BOX.

MASTERTEMP™ 125 Pool and Spa Heater Installation and User’s Guide P/N 460906 Rev. B 5/2014
2 |
Water
Pressure
Switch
Figure 26.
TO TURN OFF GAS TO APPLIANCE
1. Press the OFF button on operating control.
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Turn OFF the outside Manual Shut-Off Valve (Figure 3).
3. Remove the access door panels, see Figure 1.
4. Replace the Access Door Panels.
Manual
Shut-off
Valve
OUTSIDE MANUAL SHUT-OFF VALVE LOCATION
OPERATING INSTRUCTIONS
1. STOP!5HDGWKHVDIHW\LQIRUPDWLRQRQSDJHLYL[
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3. Turn off all electric power to the appliance. Turn OFF the Outside
Manual Shut-Off Valve (Figure 3.).
4. This appliance does not have a pilot. It is equipped with an ignition
device which automatically lights the burner. Do not try to light the
burner by hand.
5. Remove the access door panels by unfastening the two (2) screws
located on each door, then lift up and out from the bottom of the panel
to remove. If necessary, the screws may be used as handles,
see Figure 1.
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If you don’t smell gas, go to the next step.
7. Turn ON the outside Manual Shut-Off Valve (Figure 3).
8. Replace the Door Access Panels. All panels must be in place when
operating the heater.
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appropriate.
10. Turn on all electric power to the appliance.
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the operating control.
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must be above actual water temperature or burner will not
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(see Figure 2 and page ix).
13. The blower should come on immediately, and after about
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2))VZLWFKZDLW¿YHPLQXWHVDQGDJDLQSXVKWKH322/
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seconds. You may have to repeat this until all of the air
has cleared the gas line.
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temperature set on the thermostat. The blower will continue to run for
about 45 seconds after the burner shuts off. If any of the safety interlocks
should open during burner operation, the burner shuts off immediately,
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occur or the gas supply fail to shut off, turn off the manual gas control
valve to the appliance.
15. If the appliance will not operate, follow the instructions below “TO
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technician or gas supplier.
Figure 3.
Figure 1.
Section 1: Operation Instructions
Temperature
Up and Down
Digital Temperature
Display
System Operation
Indicator Lights
Dual Temperature
Controls
Heater "OFF"
Switch
Figure 2.

P/N 460906 Rev. B 5/2014 MASTERTEMP™ 125 Pool and Spa Heater Installation and User’s Guide
| 3
SAFETY CONTROLS
AIR FLOW SWITCH (AFS)
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air blower (fan) is operating and has been designed to monitor the vacuum (negative)
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upstream of the ignition module. The ignition module does not operate unless the
air pressure switch and all safety switches are closed.
WATER PRESSURE SWITCH
WARNING
Hazardous pressure. Do not bypass the Water Pressure Switch or render
it inoperable.
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“Service System”OLJKWWRJRRQ,IWKHOLJKWUHPDLQVRQDIWHUWKH¿OWHUKDV
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)RUGHFNOHYHOKHDWHULQVWDOODWLRQVWKH:DWHU3UHVVXUH6ZLWFKLVIDFWRU\VHW
at 20.6 kPa (3.00 psi). NOTE: See, “Below Pool Level Installation” on
page 8. If the pressure switch is 0.3M (1 ft.) below or above the pool water
level, reset the switch so that it is open when the pump is off and closed
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( ) to raise setting (heater below the pool) and counterclockwise
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switch after resetting.
NOTICE: When the heater is mounted more than 1.5M
(5 ft.) above or 1.2M (4 ft.) below the deck level, a
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must be installed instead.
NOTICE:+HDWHURSHUDWLRQZLWKLQFRUUHFW3UHVVXUH
6ZLWFKVHWWLQJPD\FDXVHRSHUDWLRQZLWKQRZDWHU
ÀRZ2SHUDWLRQRIWKHKHDWHUZLWKRXWVXI¿FLHQW
ZDWHUÀRZPD\VHYHUHO\GDPDJHLWwill void the
warranty.
HIGH LIMITS
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electrical circuit and shuts off the heater based on a
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Device”. The MasterTemp®125 heater has two (2)
high limit devices which are located on the main inlet
/ outlet header (see page 43 item 6).
Air Flow Switch
Water
Pressure
Switch
Figure 29.
Star Wheel
A reference scale is on
the back of pressure switch
Tu rn star wheel clockwise to raise
pressure set point if pressure switch is
more than 4 feet (1.2M) below water level
Tu rn star wheel counterclockwise to lower
pressure set point if pressure switch is more
than 5 feet (1.5M) above water level
Figure 30.
Figure 4.
Figure 5.
Figure 6.
Section 1: Operation Instructions

MASTERTEMP™ 125 Pool and Spa Heater Installation and User’s Guide P/N 460906 Rev. B 5/2014
4 |
Flame Current
Check Point
Figure 7.
Diagnostic LED
1 Flash - Air Flow Fault
2 Flashes - Flame No Call for Heat
3 Flashes - Ignition Lockout
TEMPERATURE SETTING
The heater temperature setting is factory set at 25.6° C (78° F). for the pool mode and 37.8° C (100° F). for the spa mode.
To adjust the set temperature, use the up and down arrows to set the pool/spa thermostats to a minimum temperature of
18.3° C (65° F.), or a maximum of 40° C (104° F). If you desire to heat only one body of water, the thermostat is capable
of an off mode. As an example, if you only wish to heat the spa and not the pool, simply depress and hold the pool down
arrow, and the thermostat will lower its setting to 18.3° C (65° F.) then go to an off mode. Note: See below to change the
heater’s factory set temperature settings.
ADJUST THE MAXIMUM TEMPERATURE SET POINT
1. Unbolt and remove the door panels (see Figure 8).
2. Access the control panel board on the underside of the top cover. Locate the yellow button on the corner of the
control board.
3. Push the Max. Temp. Set Point button on the back of the control board (see Figure 9).
The following sequence should happen:
1. The unit will come on and the POOL ON light will come on.
2. Press the ŸTEMP or źTEMP pad (on TOP of the panel) to set maximum pool temperature.
3. Wait up to 30 seconds; the POOL ON light will go off and the SPA ON light will come on. To override the
time delay, push the Max. Temp. Set Point button again.
4. Press the ŸTEMP or źTEMP button on the control panel and set maximum spa temperature to
40°C (104°F) or less.
5. Wait up to 30 seconds; the SPA ON light will go off and the unit will shut down. To override the time delay,
press the Max. Temp. Set Point button again.
S1
SET
M AX
S1
SET
M AX
Figure 9.Figure 8.
Door Acess Panel
Top Panel
Door Acess Panel
OPERATION OF IGNITION MODULE
The Ignition Module (see Figure 7), is microprocessor based and
operates on 24VAC supplied by the transformer. The control utilizes
a microprocessor to continually and safely monitor, analyze, and
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SAFETY CONTROLS (continued)
Set Point Button
Section 1: Operation Instructions

P/N 460906 Rev. B 5/2014 MASTERTEMP™ 125 Pool and Spa Heater Installation and User’s Guide
| 5
HEATER DESCRIPTION
Figure 10 shows a diagram of the heater and how it operates.
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The blower draws the air and gas through the mixer and forces it
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WKHÀDPHKROGHUGLVFKDUJLQJH[KDXVWJDVHVRXWWKHÀXH
5 cm (2”) PVC water piping connects directly to the manifold/
header on the heat exchanger using 4 cm (1.5”) PVC slip unions
provided with the heater. The outer manifold remains cool; no
heat sinks are required. A thermal regulator and an internal bypass
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correct outlet temperature. The heater operator control panel board
assembly is located on top of the heater.
SEQUENCE OF OPERATION
An electronic temperature sensing thermistor in the manifold
adapter inlet controls the heater operation. When the inlet water temperature drops below the temperature set on the
operating control, the burner controller supplies power to the combustion air blower through a series of safety
interlocks. The interlocks consist of;
WKHpressure switch (PS), which senses that the pump is running,
WKHhigh limit switch (HLS), which opens if the heat exchanger outlet temperature goes above 55° C (131° F), and
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WKHautomatic gas shut-off (AGS)switch, which opens if the heat exchanger outlet temperature goes above 60° C
(140° F).
WKHinlet temperature control switch, which opens if the inlet temperature goes above 45° C (110° F).
WKHVWDFNÀXHVHQVRU (SFSZKLFKVKXWVGRZQWKHKHDWHULIWKHÀXHJDVWHPSHUDWXUHUHDFKHV&)
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WKH$)6FORVHVFORVLQJWKHFLUFXLWWRWKHhot surface igniter (HSI), which ignites the fuel mixture. On a call for heat,
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WRSUHVHWWKHGHVLUHGSRRODQGVSDZDWHUWHPSHUDWXUHV7KHFRQWUROHQDEOHVWKHXVHUWRVHOHFWEHWZHHQSRRODQGVSD
heating, and features a digital display that indicates the water temperature.
Section 2: Installation Instructions
Gas
Air
Mixer
Blower
Inlet
(Cold
Water)
Exhaust
Heating Coils
Outlet
(Mixed
Water)
Burner
Figure 10.
Section 2: Installation Instructions
This product must be installed and serviced by a professional service technician, qualified in pool heater installation.
Pentair strongly recommends that all vents, pipes and exhaust systems be initially and periodically tested for proper
operation. This testing can be accomplished by using a hand-held carbon monoxide meter and/or by consulting with a
gas professional.
Pool heaters must be used in conjunction with carbon monoxide detectors installed near the pool heater. The carbon
monoxide detectors must be periodically inspected for proper operation so as to insure continued safety. Broken or
malfunctioning carbon monoxide detectors must be replaced immediately. If not fitted on the heater, the installer must
installed any safety devices according to the current local codes.

MASTERTEMP™ 125 Pool and Spa Heater Installation and User’s Guide P/N 460906 Rev. B 5/2014
6 |
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W\SHRIKHDWLQJHTXLSPHQWDQGUHODWHGFRPSRQHQWV6RPHVWDWHVUHTXLUHLQVWDOODWLRQDQGUHSDLUE\OLFHQVHGSHUVRQQHO
,IWKLVDSSOLHVLQ\RXUVWDWHEHVXUH\RXUFRQWUDFWRUEHDUVWKHDSSURSULDWHOLFHQVH6HH)LJXUHIRU2XWGRRUDQG,QGRRU
Installations.
SPECIFICATIONS (DIMENSIONS IN CENTIMETERS AND INCHES)
DIMENSIONS IN INCHES
Figure 11.
5.5"
14cm
20.85"
52.95cm
21"
53 cm
29.43"
74.76
23"
58.4cm
10.87"
27.6cm
10.87"
28.cm
17.5"
44.5cm
ELECTRICAL
CONDUIT PORT
FRONT VIE
WT
OP VIEW
EXHAUST SIDE VIE
WP
LUMBING SIDE VIEW
Section 2: Installation Instructions
PUTTING THE HEATER INTO SERVICE
If the heater is installed below the level of the pool, or more than 0.6 meters (2 feet) above pool level, the pressure switch
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WKH³&$87,21´XQGHU³%(/2:322/,167$//$7,216HFWLRQ´SDJH
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the front of this manual. Check for proper operation of the heater by following the steps under, see page 11 “OPERATION
,16758&7,216´

P/N 460906 Rev. B 5/2014 MASTERTEMP™ 125 Pool and Spa Heater Installation and User’s Guide
| 7
PLUMBING CONNECTIONS
The MasterTemp 125 heater has the capability of direct
schedule 40 PVC plumbing connections. A set of bulkhead
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conformity with Pentair’s recommended PVC plumbing
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Figure 12 for plumbing connections.
CAUTION
Before operating the heater on a new installation, turn on
the circulation pump and bleed all the air from the filter
using the air relief valve on top of the filter. Water should
flow freely through the heater. Do not operate the heater
unless water in the pool/spa is at the proper level. If a
manual by-pass is installed, temporarily close it to insure
that all air is purged from the heater.
WATER CONNECTIONS
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heater, and the heater discharges directly to the pool or spa.
A manual bypass valve should be installed across the heater
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Make sure that the outlet plumbing from the heater contains
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the pool and spa, use a diverter valve. Do not use any valve that
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heater unless it is below the level of the pool or spa.
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reversed when installing heater.
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thermal mass of the heater will prevent overheating of the piping connected to the pump even if the heater shuts down
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In this case, run the pump at high speed only to operate the heater. If this does not solve the problem, do not try to run
the heater. Instead, correct the installation.
Do not operate the heater while an automatic pool cleaner is also operating. If the circulation pump suction is plugged
IRUH[DPSOHE\OHDYHVWKHUHPD\QRWEHDGHTXDWHÀRZWRWKHKHDWHU'RQRWUHO\RQWKHSUHVVXUHVZLWFKLQWKLVFDVH
If local codes require the installation of a pressure relief valve (PRV), see page 35 for “PRESSURE RELIEF VALVE
INSTRUCTIONS”.
Pool
Main
Drain
Spa
From Pool 3-Way
Valve
3-Way
Valve
3-Way
Valve
Chlorinator
Heater
Pump
Check Valve
Filter
Figure 13.
PUMP
FILTER
HEATER
MANUAL
BY-PASS
TO
POOL
GATE
VALVE
FROM
POOL
FROM
FILTER
Figure 12.
Section 2: Installation Instructions

MASTERTEMP™ 125 Pool and Spa Heater Installation and User’s Guide P/N 460906 Rev. B 5/2014
8 |
BELOW POOL INSTALLATION
,IWKHKHDWHULVEHORZZDWHUOHYHOWKHSUHVVXUHVZLWFKPXVWEHDGMXVWHG7KLVDGMXVWPHQWPXVWEHGRQHE\DTXDOL¿HG
service technician. See following CAUTION before installation.
CAUTION
BELOW OR ABOVE POOL INSTALLATION
The WATER PRESSURE RELIEF VALVE SWITCH is set in the factory at 21 kPa (± 5 kPa) (3 ± 0.7 psi). This setting is for
a heater installed at pool level. If the heater is to be installed more than 0.3 m (1ft.) above or below, the water pressure
switch must be adjusted by a qualified service technician. See page 35 Figure 30.
FLOW SWITCH INSTILLATION
If the heater is installed more than 1.5 m above the pool or more than 1.2 m below the pool level, which is beyond the
limits of the heater’s pressure switch specification. In this case, a flow switch must be installed in the heater. Locate
and install the flow switch externally on the outlet piping from the heater, as close as possible to the heater. Connect
the flow switch wires as used for the water pressure switch.
VALVES
When any equipment is located below the surface of the pool or spa, valves should be placed in the circulation piping
V\VWHP WR LVRODWH WKH HTXLSPHQW IURP WKH SRRO RU VSD &KHFN YDOYHV DUH UHFRPPHQGHG WR SUHYHQW EDFNVLSKRQLQJ
%DFNVLSKRQLQJLVPRVWOLNHO\WRRFFXUZKHQWKHSXPSVWRSVFUHDWLQJDSUHVVXUHVXFWLRQGLIIHUHQWLDO'RNOT sanitize the
pool by putting chlorine tablets or sticks into the skimmer(s). When the pump is off, this will cause a high concentration
of chlorine to enter the heater, which could cause corrosion damage to the heat exchanger.
CAUTION
Exercise care when installing chemical feeders so as to not allow back siphoning of chemical into the heater, filters or
pump. When chemical feeders are installed in the circulation of the piping system, make sure the feeder outlet line is
down stream of the heater, and is equipped with a positive seal noncorrosive “Check Valve”, (P/N R172288), between
the feeder and heater.
MANUAL BY-PASS (WATER FLOW RATE)
:KHUHWKHZDWHUÀRZUDWHH[FHHGVWKHPD[LPXP/30DPDQXDO
bypass should be installed and adjusted. After installing the valve, adjust
WKHYDOYHWREULQJWKHÀRZUDWHZLWKLQWKHDFFHSWDEOHUDQJH7KHQUHPRYH
WKHYDOYHKDQGOHRUORFNLWLQSODFHWRDYRLGWDPSHULQJ6HH)LJXUH.
Table 1.
See page 35 for Pressure Relief Valve Installations.
Cool water in
Warm water out
OUTLET TO POOL
INLET FROM HEATER
1. Set Manual By-Pass Valve.
2. Remove Handle.
Figure 14.
Model Min. LPM (GPM) Max. LPM (GPM) *
125 76 (20) 265 (70)
* DO NOT EXCEED THE MAXIMUM RECOMMENDED FLOW RATE
FOR THE CONNECTING PIPING.
Section 2: Installation Instructions

P/N 460906 Rev. B 5/2014 MASTERTEMP™ 125 Pool and Spa Heater Installation and User’s Guide
| 9
GAS CONNECTIONS
GAS LINE INSTALLATIONS
The gas supply must be installed in accordance with the Gas Installation Code, AS/NZS.5601.1 and all applicable local
codes.
Before installing the gas line, be sure to check which gas the heater has been designed to burn. This is important because
different types of gas require different gas pipe sizes. The rating plate on the heater will indicate which gas the heater is
designed to burn. Table 2 below shows the recommended gas inlet pipe sizes required for the distance from the gas meter
WRWKHKHDWHU7KHWDEOHLVIRUQDWXUDOJDVDWDVSHFL¿FJUDYLW\RIDQGSURSDQHDWDVSHFL¿FJUDYLW\RI
When sizing gas lines, calculate 0.9 additional meters of straight pipe for every elbow used. When installing the gas line,
avoid getting dirt, grease or other foreign material in the pipe as this may cause damage to the gas valve, which may result in
heater failure.
The gas meter should be checked to make sure that it will supply enough gas to the heater and any other appliances that
PD\EHXVHGRQWKHVDPHPHWHU,QVXI¿FLHQWJDVVXSSO\ZLOOFDXVHWKHKHDWHUWRRSHUDWHEHORZLWVGHVLJQHGSHUIRUPDQFHRU
not at all. The gas line from the meter will usually be of a larger size than the gas valve supplied with the heater. Therefore
a reduction of the connecting gas pipe will be necessary. Make this reduction as close to the heater as possible. If the
gas pressure is not adjusted to the correct working pressure, the heater will be over gassed and cause serious damage
within minutes. This damage is not covered under the heater warranty.
,QVWDOODPDQXDOVKXWRIIYDOYHWKDWFRQIRUPVZLWKType 1 or Type 2 as per AG201 and/or AS4617 standards and a
sediment trap/drip leg and union located outside the heater panels, see Figure 15. Do not use a restrictive gas cock.
The heater and any other gas appliances must be disconnected from the gas supply piping system during any pressure
testing on that system, (greater than 6.0 kPa). The heater and its gas connection must be leak tested before placing the
heater in operation. 'RQRWXVHÀDPHWRWHVWWKHJDVOLQH8VHVRDS\ZDWHURUDQRWKHUQRQÀDPPDEOHPHWKRG
NOTE
A manual main shut-off valve must be installed externally to the heater.
WARNING
DO NOT INSTALL THE GAS LINE UNION INSIDE THE HEATER CABINET. THIS WILL VOID YOUR WARRANTY.
Figure 15.
Heater
Size
Distance from the Meter
0 to 15 m 16 to 30 m 31 to 60 m
125 25 mm 32 mm 32 mm
Manual
Shut-off
Valve
Sediment
Trap/Drip Leg
Union
At least 22.9 cm (9")
At least 7.6 cm (3")
2.54 cm (1") Dia. or larger
(See "Recommended
Pipe Sizes" Chart
)
46-61 cm of 1.91 cm
(18–24" of 3/4")
Gas line from
Valve
Bell
Reducer
SEDIMENT TRAPS (DRIP LEG)
Install a sediment trap and union located outside the heater panels
in accordance with current local codes. Do not use a restrictive
JDVFRFN7KHVHGLPHQWWUDSVKDOOEHHLWKHUDWHH¿WWLQJZLWKD
capped nipple in the bottom outlet which can be removed for
cleaning, as shown in Figure 15, or an other device recognized
as an effective sediment trap. All gas piping should be tested
after installation in accordance with current local codes.
Section 2: Installation Instructions
Table 2.

MASTERTEMP™ 125 Pool and Spa Heater Installation and User’s Guide P/N 460906 Rev. B 5/2014
10 |
TESTING GAS LEAKS AND GAS PRESSURE
THE MASTERTEMP HEATER IS INTENDED FOR INSTALLATION WITH A METERED GAS PRESSURE REGULATOR. Before operating
the heater, the heater and its gas connections must be leak tested. 'R127XVHDQRSHQÀDPHWRWHVWIRUOHDNV Test all
gas connections for leaks with soapy water.
The gas valve must be completely disconnected from the gas supply piping system during any pressure testing of that
system at test pressures in excess of 6.0 kPa.
TESTING THE GAS PRESSURE THROUGH THE COMBINATION GAS CONTROL VALVE
WARNING
Risk of fire and explosion. Alteration, service, or maintenance of the Combination Gas Control Valve can lead to fire or explosion,
causing loss of life, personal injury, and/or property damage. DO NOT ATTEMPT TO ADJUST THE GAS CONTROL VALVE.
Figure 16.
 6KXWRIIWKHJDVVXSSO\WRWKHKHDWHU
2. Loosen the small screw inside the pressure tap as shown in Figure 14.
3. Connect the manometer hose.
4. Open the gas supply to the heater.
5. Turn on the heater.
6. Take the gas pressure reading.
7. Turn off the heater.
 6KXWRIIWKHJDVVXSSO\WRWKHKHDWHU
9. Disconnect the manometer hose.
10. Tighten the small screw inside the pressure tap.
Description Type Gas Supply Pressure
Natural Gas 1.13 kPa 6.0 kPa
Propane Gas 2.75 kPa 6.0 kPa
NOTE: The minimum value approved for input adjustment. Do not exceed the
maximum supply pressure.
All readings must be taken while heater is operating. Any adjustments or
readings made while heater is off will result in performance problems.
INLET GAS PRESSURE REQUIREMENTS
CAUTION! This appliance is equipped with an unconventional gas control valve that is factory set with a manifold
SUHVVXUHRIN3D,QVWDOODWLRQRUVHUYLFHPXVWEHSHUIRUPHGE\DTXDOL¿HGLQVWDOOHUVHUYLFHDJHQF\RUWKHJDV
supplier. If this control valve is replaced, it must be replaced with an identical control. The combination gas valve
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outlet manifold of the valve must be 11 ± 5 kPa below the reference pressure at the blower mixer inlet, and the gas
YDOYHµ9(17¶WDSPXVWEHFRQQHFWHGWRWKHHQGFDSDLURUL¿FHDVVKRZQLQ)LJXUH DO NOT attempt to adjust the
gas input by adjusting the regulator setting. The correct gas regulator setting is required to maintain proper
combustion and must NOT be altered.
Lightly loosen the
small screw inside the pressure tap,
and attach/connect the manometer hose.
Table 3.
Section 2: Installation Instructions