Pentair MASTERTEMP MT200HD User manual

P/N 475106 Rev. D 1/2016 MASTERTEMP™Pool and Spa Heater Installation and User’s Guide
1 1
PentairWater Pool and Spa, Inc.USA – 1620 Hawkins Ave., Sanford, NC 27330, USA • [phone] • [phone] –
INSTALLATION AND USER’S GUIDE
MASTERTEMP™POOL AND SPA EURO HEATER
DONOTstoreorusegasolineorotherflammablevaporsandliquidsinthevicinity
of this or other appliances.
FOR
YOUR
SAFETY
Improper 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.
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.
MT200HD,EURO
MT300HD,EURO
MT400HD,EURO
FOR YOUR SAFETY - This product must be installed and serviced by authorized personnel, qualified in pool/spa
heaterinstallation. Improper installationand/or operationcancreate carbonmonoxide gas andflue gaseswhichcan
cause serious injury, property damage, or death. For indoor installations, as an additional measure of safety, Pentair
Aquatic Systems strongly recommends installation of suitable Carbon Monoxide Detectors in the vicinity of this
applianceand inany adjacentoccupied spaces.Improper installation and/oroperation willvoid thewarranty.
FOR YOUR SAFETY - READ BEFORE OPERATING
If you do not follow these instructions exactly, a fire or explosion may result, causing
property damage, personal injury or loss of life. For additional free copies of this
manual; call USA [phone]
• If you do not follow these instructions exactly, a fire or explosion may result, causing property damage,
personal injury or loss of life.
• Improper installation, adjustment, alteration, service or maintenance can cause property damage, personal
injuryor death. Installationand servicemustbe performedbya qualifiedinstaller, service agencyor thegas
supplier.
• Do not place articles or against this appliance.
• Do not use or store flammable materials near this appliance.
• Do not spray aerosols in the vicinity of this appliance while it is in operation.
OWNER:
Retain For
Future
Reference
PentairWater Pool and Spa,Inc. EMEA – Head Office:Industriepark, Wolfstee,Toekomstlaan 30, 2200 Herentals - Belgium.
10951 W.Los Angeles Ave., Moorpark, CA 93021, USA • [phone] • [phone]
www.pentaireurope.com-www.pentairwater.com.au-www.pentairpool.com-www.staritepool.com
FOR YOUR SAFETY
0087
1312
NOx CLASS 5
COUNTRY OF DESTINATION:
GB, BE, FR, DE
Natural Gas
Models
(G20, G25) Propane Gas
(G31)
461082 461083
461086 461087
461090 461091
(240 VAC)

MASTERTEMP™Pool and Spa Heater Installation and User’s Guide P/N 475106 Rev. D 1/2016
Technical Data
| Technical Data
i
P/N 475106 Rev.D 1/2016
General Specifications
GASTYPE:
GASGROUP:
GASSUPPLY PRESSURE:
TYPE OF APPLIANCE:
COUNTRY OF DESTINATION:
WARNING!
READ THE TECHNICAL INSTRUCTIONSBEFORE INSTALLING THISAPPLIANCE.
READ THE INSTALLATION AND USER’SGUIDE BEFORE LIGHTINGTHISAPPLIANCE.
0087
1312
6
0087
1312
THIS HEATER IS EQUIPPED TO BURN
OUTPUT
ALTITUDE
MINIMUM CLEARANCE FROM COMBUSTIBLE
CONSTRUCTED 15 CM REAR, 15 CM TOP
DO NOT INSTALL THIS HEATER UNDER AN OVERHANG
LESS THAN 1 METER FROM THE TOP. THE AREA UNDER
THE OVERHANG MUST BE OPEN ON THREE (3) SIDES.
APPROVED FOR INDOOR AND OUTDOOR INSTALLATIONS ELECTRICAL COMPLIANCE: IN ACCORDANCE
WITH LOCAL ELECTRICAL CODES.
THIS APPLIANCE MUST BE INSTALLED IN ACCORDANCE WITH THE EUROPEAN STANDARD INSTALLATION
CODES, AND WITH THE REQUIREMENTS OF THE AUTHORITY HAVING JURISDICTION.
REFER TO THE OPERATING INSTRUCTIONS FOR
APPROVED WATER TREATMENT.
TYPE G23
G20:
G31:
TEST POINT PRESSURE
MAX. WORKING PRESSURE
mbar
mbar
mbar
3.45 mbar
ELECTRICAL RATINGS:
VOLTS:
HERTZ:
AMPS:
12 A
APPLIANCE CATEGORY
COUNTRY OF DESTINATION
YEAR OF MANUFACTURE
MODEL NO.
SERIAL NO.
DESIGN AND MANFACTURED BY PENTAIR WATER POOL AND SPA, INC.
INPUT RATE
ORIFICE SIZE
MASTERTEMP
™
POOL HEATER
GAS
kW
mm
2000 m
kW
Label P/N
GB, BE, DE, FR
Hz
V
GAS SUPPLY PRESSURE:
G25:
mbar,

P/N 475106 Rev. D 1/2016 MASTERTEMP™Pool and Spa Heater Installation and User’s Guide
Contents
TechnicalData /Heater Identification Information(HIN) .................................................................................................................................... ii - iii
CodeRequirements /References .................................................................................................................................................................... iv
Consumer Information and Safety / Warnings and Safety Instructions / General Specifications............................................................ v - vii
Section 1. Operations ........................................................................................................................... 1
Overview / Important Notices / Warranty Information .................................................................................................................. 1
Using the Heater’s Control Panel.................................................................................................................................................... 2
Operating Instructions / Basic System Operation ........................................................................................................................ 3
Basic System Operation / HSI (Hot-Surface Ignition) Lighting/Operation.................................................................................. 3
Start-up and Operation .................................................................................................................................................................... 3
Operating Instructions..................................................................................................................................................................... 4
To Turn Off Gas to Appliance .......................................................................................................................................................... 4
Safety Controls: Air Flow Switch (AFS) / Water Pressure Switch / Height Limit Devices .......................................................... 5
Operation of Ignition Module ........................................................................................................................................................... 6
Temperature Setting / Maximum Temperature Set Point ............................................................................................................... 6
Section 2. Installation Instructions ...................................................................................................... 7
HeaterDescription................................................................................................................................................................................ 7
SequenceofOperation......................................................................................................................................................................... 7
PuttingtheHeaterintoService ............................................................................................................................................................ 8
Specifications ...................................................................................................................................................................................... 8
PlumbingConnections.......................................................................................................................................................................... 9
Valves .................................................................................................................................................................................................. 9
ManualBy-Pass .................................................................................................................................................................................. 9
WaterConnections ............................................................................................................................................................................... 10
BelowPoolInstallation ......................................................................................................................................................................... 10
GasConnections ................................................................................................................................................................................. 11
Gas Pipe Sizing ................................................................................................................................................................................... 11
SedimentTrap/DripLeg ....................................................................................................................................................................... 11
TestingGasLeaksand GasPressure .................................................................................................................................................. 12
GasPressureRequirements ................................................................................................................................................................ 12
OutdoorInstallation/ Heater Clearances .............................................................................................................................................. 13-14
Indoor Venting—General Requirements / Heater Clearances / Outside Vent Removal ).................................................................... 15- 16
CombustionAir Supply .................................................................................................................................................................... 15
Vent Installation (Indoor Installation or Outdoor Shelter) - Vertical Venting ...................................................................................... 16
DirectAir Intake Duct with 63 mm (2.5 in) PVC Pipe (Heater Indoor Installation) ............................................................................. 16
Horizontal or Vertical Venting - Using Single-Wall Stainless Gas Vent ........................................................................................... 17
Connecting Single-Wall Stainless Steel Vent to the Heater ............................................................................................................. 18 - 19
Corrosive Vapors and Possible Causes.............................................................................................................................................. 20
Control Panel Indexing ....................................................................................................................................................................... 20
Final Installation Check....................................................................................................................................................................... 20
Electrical Connections ........................................................................................................................................................................ 21
Fireman’s Switch Connection/Remote Control Connections .............................................................................................................. 21 - 22
MasterTemp Wiring Diagram / Electrical Schematic Ladder Diagram................................................................................................. 23 - 24
Section 3.Troubleshooting ................................................................................................................. 25
Initial Troubleshooting and Troubleshooting Chart ............................................................................................................................. 25
Heater Will Not Fire Troubleshooting (A, B, C, D) ............................................................................................................................... 26 - 29
LED Diagnostics (AGS,AFS, HLS, PS Thermistor)............................................................................................................................. 30 - 31
Burner / Heat Exchanger Troubleshooting .......................................................................................................................................... 32
Section 4. Maintenance Instructions.................................................................................................. 33
Care and Maintenance ....................................................................................................................................................................... 33
Pressure Relief Valve .......................................................................................................................................................................... 33
AfterStart-Up....................................................................................................................................................................................... 34
Spring, Fall (Autumn) and Winter Operation ...................................................................................................................................... 34
Maintaining Pool Temperature / Energy Saving Tips .......................................................................................................................... 35
Chemical Balance ............................................................................................................................................................................... 35 - 36
Replacement Parts.............................................................................................................................................................................. 37 - 41
ii
Contents |

MASTERTEMP™Pool and Spa Heater Installation and User’s Guide P/N 475106 Rev. D 1/2016
To identify the heater, see the data rating plate on the inner front panel of the heater. There are two designators for
each heater, one is the Model Number and the other is the Heater Identification Number (HIN).
Heater Identification Number (HIN)
The following example simplifies the identification system:
1) MT : MasterTemp
2) Model Size : (200, 300 or 400) : Input rating (Gross BTU/hr)
3) Construction : (HD = Heavy Duty Model)
4) FuelType : (LP = Propane gas or NA = Natural gas)
MT 300 HD
MT = MASTERTEMP
MODEL SIZE = BTU/hr GROSS INPUT
H. I. N.
HEATER IDENTIFICATION NUMBER
ID DESIGNATOR FOR PENTAIR POOL AND SPA MASTERTEMP™ HEATERS
Example:
123 4
FUEL TYPE = NA = NATURAL GAS
LP = PROPANE GAS
200 (200 [ BTU/hr ), 300 (300 [ BTU/hr ) or 400 (400 [ BTU/hr )
HD = HEAVY DUTY MODEL
N
Heater Identification Information (HIN)
Heater Data Rating Plate Location
The heater data rating plate is located on the inner front panel of the heater. To access the data rating plate, unbolt and
remove the side door access panel as shown below.
Heater Data Rating Plate
Door
Access
Panel
Top Panel
Remove this Door
Access Panel to access
the DATA RATING PLATE
| Heater Identification Information
iii
0087
1312
THIS HEATER IS EQUIPPED TO BURN
OUTPUT
ALTITUDE
MINIMUM CLEARANCE FROM COMBUSTIBLE
CONSTRUCTED 15 CM REAR, 15 CM TOP
DO NOT INSTALL THIS HEATER UNDER AN OVERHANG
LESS THAN 1 METER FROM THE TOP. THE AREA UNDER
THE OVERHANG MUST BE OPEN ON THREE (3) SIDES.
APPROVED FOR INDOOR AND OUTDOOR INSTALLATIONS ELECTRICAL COMPLIANCE: IN ACCORDANCE
WITH LOCAL ELECTRICAL CODES.
THIS APPLIANCE MUST BE INSTALLED IN ACCORDANCE WITH THE EUROPEAN STANDARD INSTALLATION
CODES, AND WITH THE REQUIREMENTS OF THE AUTHORITY HAVING JURISDICTION.
REFER TO THE OPERATING INSTRUCTIONS FOR
APPROVED WATER TREATMENT.
TYPE G23
G20:
G31:
TEST POINT PRESSURE
MAX. WORKING PRESSURE
mbar
mbar
mbar
3.45 mbar
ELECTRICAL RATINGS:
VOLTS:
HERTZ:
AMPS:
12 A
APPLIANCE CATEGORY
COUNTRY OF DESTINATION
YEAR OF MANUFACTURE
MODEL NO.
SERIAL NO.
DESIGN AND MANFACTURED BY PENTAIR WATER POOL AND SPA, INC.
INPUT RATE
ORIFICE SIZE
MASTERTEMP™POOL HEATER
GAS
kW
mm
2000 m
kW
Label P/N
GB, BE, DE, FR
Hz
V
GAS SUPPLY PRESSURE:
G25:
mbar,

P/N 475106 Rev. D 1/2016 MASTERTEMP™Pool and Spa Heater Installation and User’s Guide
CODE REQUIREMENTS / REFERENCES
Installation must be in accordance with the code requirements:
•Manufacturer’sInstallation Instructions
• LocalGas Fitting Regulations
• MunicipalBuildingCodes
•
EN 437: 2003 + A1 (2009) Test Gases - Test
pressuresappliancescategorizes.
• EN 60335-2-102/A1 - Household and similar
electric appliances - Safety - 2- 2012
• BS 6891 Specification for installation of
lowpressuregas pipework.
• BS5482:1 Code of practice for domestic
butaneandpropanegasburning
installations.BuildingRegulations|
Part L1.
• LocalElectricalRegulations
• Anyother statutory regulations
•E N 15502-1 : 2012 Gas fired heating
boilersgeneralrequirementstest.
• BS 6644 : 2011 Specifications for
theinstallation andmaintenance of
gasfiredhotwaterboilersbetween
70Kw - 1.8 mW, (2nd. and 3rd. gas
family).
Code Requirements / References | iV
IMPORTANT NOTICE:
DO NOT directly connect any external control device to this appliance, unless noted in this Installation and User’s Guide
or recommended by the manufacturer. Any installed control device not recommended by the manufacturer could violate
the Gas Safety Regulations (the installation and use), the above described regulations and the appliance warranty.
The manufacturer’s notices DO NOT supersede any legal requirements.
Gas Safety (Installation and Use) Regulations, (as amended).
It is the law that all gas appliances are installed by a competent person (e.g. a CORGI registered operative) in accordance with Regulations.
Failure to install appliances correctly could lead to prosecution. The installation of the Heater MUST also be in accordance with the
current I.E.E.. Wiring Regulations, the European Building Standards, the Bye Laws of the Local Water Undertaking, any relevant
requirements of the Local Authority, and Health and Safety document No 635, “Electricity at Work Regulations”.
Detailed recommendations are contained in the following European Standard Codes of Practice.
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MASTERTEMP™Pool and Spa Heater Installation and User’s Guide P/N 475106 Rev. D 1/2016
| Code Requirements / References
V
WARNING
The Consumer Product Safety Commission warns that carbon monoxide is an "invisible killer". Carbon monoxide is a
colorless and odorless gas.
1. Carbonmonoxideisproducedbyburningfuel,includingnaturalgasandpropane.
2. Properinstallation,operationandmaintenanceoffuel-burningappliancesinthehomeisthemostimportantfactorinreducing
carbonmonoxidepoisoning.
3. Besurethatfuelburningappliancessuchasheatersareinstalledbyprofessionalsaccordingtomanufacturer'sinstructionsand
codes.
4. Alwaysfollowthemanufacturer'sdirectionsfor safeoperation.
5. Havetheheatingsystem(includingvents) inspectedandserviced annuallybyatrainedservicetechnician.
6. Examineventsregularlyfor improperconnections,visiblecracks, rustorstains.
7. Installbattery-operatedcarbonmonoxidealarms.ThealarmsshouldbecertifiedtotherequirementsofthemostrecentUL,CE,
IAS,CSAandIAPMOstandardforcarbonmonoxidealarms.Testcarbonmonoxidealarmsregularlyandreplacedeadbatteries.
WARNING
The Consumer Product Safety Commission warns that elevated water temperature can be hazardous. See below
for water temperature guidelines before setting temperature.
1. Spaorhottubwatertemperaturesshouldneverexceed40°C. Atemperatureof37°C.is consideredsafe forahealthyadult.
Specialcautionis suggestedforyoung children.Prolongedimmersionin hotwatercan inducehyperthermia.
2. Drinkingofalcoholic beveragesbeforeorduringspa orhottubusecan causedrowsinesswhichcouldleadtounconsciousness
andsubsequentlyresultindrowning.
3. Pregnantwomenbeware! Soakingin waterabove37°C. cancausefetaldamageduringthefirst threemonthsofpregnancy
(resultinginthebirthof abrain-damagedor deformedchild). Pregnantwomenshouldsticktothe37° C.maximumrule.
4. Beforeentering thespaorhot tub,theusershould checkthewatertemperaturewithanaccuratethermometer.Spaorhot tub
thermostats may error in regulating water temperatures by as much as -15° C.
5. Persons with a medical history of heart disease, circulatory problems, diabetes or blood pressure problems should
obtain their physician's advice before using spas or hot tubs.
6. Persons taking medication which induce drowsiness, such as tranquilizers, antihistamines or anticoagulants should
not use spas or hot tubs.
DANGER
CARBON MONOXIDE GAS IS DEADLY – Exhaust from this pool heater contains toxic levels of carbon monoxide, a dangerous,
poisonous gas you cannot see or smell.
THE MASTERTEMP HEATER IS CLASSIFIEDASACLASS 5 LOW NOX BOILER.
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

P/N 475106 Rev. D 1/2016 MASTERTEMP™Pool and Spa Heater Installation and User’s Guide
WARNINGS AND SAFETY INSTRUCTIONS
The MasterTemp pool heaters are designed and manufactured to provide many years of safe and reliable service when
installed, operated and maintained according to the information in this manual. Throughout the manual, safety warnings and
cautions are identified by the “ “ symbol. Be sure to read and comply with all of the warnings and cautions.
DANGER — CARBON MONOXIDE GAS IS DEADLY
• • READ OWNERS MANUAL COMPLETELY BEFORE OPERATING. • •
THIS PRODUCT MUST BE INSTALLED AND SERVICED BY A PROFESSIONAL SERVICE
TECHNICIAN, QUALIFIED IN POOL HEATER INSTALLATION. Some jurisdictions require that
installersbelicensed.Checkwithyourlocalbuildingauthorityaboutcontractorlicensingrequirements.
Improper installation and/or operation could create carbon monoxide gas and flue gases which could
cause serious injury or death. Improper installation and/or operation will void the warranty.
Exhaust from this pool heater contains carbon monoxide, a dangerous, poisonous gas you cannot
see or smell. Symptoms of carbon monoxide exposure or poisoning include dizziness, headache,
nausea, weakness, sleepiness, muscular twitching, vomiting and inability to think clearly. IF YOU
EXPERIENCE ANY OF THE ABOVE SYMPTOMS, IMMEDIATELY TURN OFF THE POOL
HEATER,LEAVETHEVICINITYOFTHEPOOLORSPAANDGETINTOFRESHAIRIMMEDIATELY.
THE POOL HEATER MUST BE THOROUGHLY TESTED BY A GAS PROFESSIONAL BEFORE
RESUMING OPERATION.
EXCESSIVECARBONMONOXIDEEXPOSURECANCAUSEBRAINDAMAGEORDEATH.
Install this pool heater far from open windows, doors, vents and other openings, see page 16 for
minimum distances.
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.
WARNING — This heater is equipped with an unconventional gas control valve that is factory set with a
manifold pressure of 1.1 ± 0.5 mbar. Improper installation, adjustment, alteration, service or
maintenance can cause property damage, personal injury or loss of life. Installation or service must
be performed by a qualified installer, service agency or the gas supplier. If 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.
WARNING — Risk of fire or explosion from incorrect fuel use or faulty fuel conversion. Do not try to run a
heatersetup forG20,G25orG31 gas orviceversa.Onlyqualified servicetechniciansshouldattemptto
convert heater from one fuel to the other. Do not attempt to alter the rated input or type of gas by
changing the orifice. If it is necessary to convert to a different type of gas, consult your Pentair dealer.
Serious malfunction of the burner can occur which may result in loss of life. Any additions, changes,
or conversions required in order for the appliance to satisfactorily meet the application needs must
be made by a Pentair dealer or other qualified agency using factory specified and approved parts.
Theheateris availableforusewith G20,G25orG31gas only.Itisnotdesignedto operatewithanyother
fuels.Refertothenameplateforthetypeofgastheheaterisequippedtouse.
• Useheateronlywiththefuelforwhichitisdesigned.
• Ifafuelconversion is necessary,referthiswork to a qualified servicetechnicianorgassupplier
before putting the heater into operation.
Warnings and Safety Instructions | vi

MASTERTEMP™Pool and Spa Heater Installation and User’s Guide P/N 475106 Rev. D 1/2016
WARNINGS AND SAFETY INSTRUCTIONS (continued)
WARNING — Risk of fire or explosion from flammable vapors. Do not store gasoline, cleaning fluids, varnishes,
paints, or other volatile flammable liquids near heater.
WARNING — Risk of explosion if unit is installed near G31 gas storage. G31 gas is heavier than air. Consult
local codes and fire protection authorities about specific installation requirements and restrictions.
Locate the heater away from propane gas storage and filling equipment as specified by the Standard
for the Storage and Handling of G31 (latest edition).
WARNING — Risk of fire. Do not place articles on, near or against the heater.
WARNING — Risk of burn hazard. To reduce the risk of injury, do not touch the side heater vent cover when
the heater is operating. Side heater vent covers are HOT and can burn when touched causing
personal injury. Do 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. Do 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. The 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.
• Connect heater to 240 Volt, 50 Hz., Single Phase power only.
• Verify proper operation after servicing.
• Do not allow children to play on or around heater or associated equipment.
• Never allow children to use the pool or spa without adult supervision.
• Read and follow other safety information contained in this manual prior to operating this pool heater.
GENERAL SPECIFICATIONS
NOTICE:
• Combustion air contaminated by corrosive chemical fumes can damage the heater and will void the warranty.
• The Combination Gas Control Valve on this heater differs from most appliance gas controls. If it must be replaced,
for safety reasons replace it only with an identical gas control.
• The access door panels must be in place to provide proper ventilation. Do not operate the heater for more than five (5)
minutes with the access door panels removed.
• Thisheateris design certified by CERTIGAZas complying with the StandardforGas Fired Pool Heaters, andis intended
for use in heating fresh water swimming pools or spas.
• The heater is designed for the heating of chlorine, bromine or salt system swimming pools and spas. It should NOT be
used as a space heating boiler, or general purpose water heater. The heater requires an external 240 VAC
single-phase electric power source.
• The 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. The pan must not restrict air flow.
• Theheatermaynotbeinstalledwithin3.5m(11.5ft.)oftheinsidesurfaceofapoolorspaunlessitisseparatedbya
solidfence,wallorotherpermanentbarrier.
Vent
Cover
vii
| Warnings and Safety Instructions

P/N 475106 Rev. D 1/2016 MASTERTEMP™Pool and Spa Heater Installation and User’s Guide
| 1
MasterTemp™ Pool and Spa Heater
Congratulations on your purchase of a MasterTemp™high performance heating system. Proper installation and service of
your new heating system and correct chemical maintenance of the water will ensure years of enjoyment. The MasterTemp
is a compact, lightweight, efficient, induced-draft, gas fired high performance pool and spa heater that can be directly
connected to 63 mm (2 in) PVC pipe. The MasterTemp also comes equipped with a multifunction temperature controller
which shows, at a glance, the proper functioning of the heater.All MasterTemp heaters are designed with a direct ignition
device, HSI (hot-surface ignition), which eliminates the need for a standing pilot. The MasterTemp requires an external
power source (240 VAC 50 Hz) to operate.
SPECIAL INSTRUCTIONS TO OWNER: Retain this manual for future reference. This instruction manual provides
operatinginstructions,installation and service information for the MasterTemp highperformanceheater.Theinformation in
this manual applies to all MasterTemp models. READ AND REVIEW THIS MANUAL COMPLETELY, it is very
importantthattheowner/installer readandunderstandthesection coveringinstallationinstructions,andrecognizethe European
Standard Codes of Practicebefore installing the MasterTemp. Its use will reduce service calls and chance of injury and will
lengthenproductlife.Historyandexperiencehasshownthatmostheaterdamageiscausedbyimproperinstallationpractices.
IMPORTANT NOTICES
THIS PRODUCT MUST BE INSTALLED AND SERVICED BY A PROFESSIONAL SERVICE TECHNICIAN, QUALIFIED
IN POOL HEATER INSTALLATION.
For the installer and operator of the MasterTemp pool and spa heater: The manufacturer’s warranty may be
void if, for any reason, the heater is improperly installed and/or operated. Be sure to follow the instructions set forth in
this manual. If you need more information or if you have any questions regarding to this pool heater, please contact
Pentair Water Pool and Spa, Inc. EMEA – Head Office: Industriepark, Wolfstee, Toekomstlaan 30, 2200 Herentals
- Belgium or Pentair Water Pool and Spa, USA – at [phone] • [phone] • [phone].
WARRANTY INFORMATION
The MasterTemp pool heater is sold with a limited factory warranty. Specific details are described on the warranty
registration card which is included with the product.Return the warranty registration card after filling in the serial
number from the rating plate inside the heater.
High standards of excellence include a policy of continuous product improvement results in your state-of-the-art
heater. We reserve the right to make improvements which change the specifications of the heater without incurring
an obligation to update the current heater equipment.
These heaters are designed for the heating of chlorine, bromine or salt system swimming pools and spas or
in non-stationary installations, and should never be employed for use as space heating boilers or general
purpose water heaters. The manufacturer’s warranty may be void if, for any reason, the heater is improperly
installed and/or operated. Be sure to follow the instructions set forth in this manual.
CAUTION
OPERATING THIS HEATER CONTINUOUSLY AT WATER TEMPERATURE BELOW 20°C. 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, as this will cause condensation
related problems.
Introduction
Section 1. Overview

MASTERTEMP™Pool and Spa Heater Installation and User’s Guide P/N 475106 Rev. D 1/2016
2 | Section 1. Operations
Temperature
Up and Down
Digital Temperature
Display
System Operation
Indicator Lights
Dual Temperature
Controls
Heater "OFF"
Switch
WARNING
Risk of explosion or fire causing burns or death if safety interlocks are disabled. DO NOT attempt to operate heater
when SERVICE HEATER light is on or if blower or burner will not start. Instead, follow instructions under “To Switch Off Gas to
the Appliance,” and call a qualified service technician to repair unit.
USINGTHE HEATER’S CONTROL PANEL
The MasterTemp heater controls are as follows:
POOL ON Press this button to control the heater operation by the pool temperature setting.
SPA ON Press this button to control the heater operation by the spa temperature setting.
HEATER OFF Press this button to switch off the heater.


 TEMP Press this button to raise the temperature setting.


TEMP Press this button to lower the temperature setting.
To toggle the display between degrees Centigrade (°C) and degrees Fahrenheit (°F):
1. Press the HEATER OFF button to switch the heater OFF.
2. Press TEMP or TEMP for five (5) seconds. The display will flash once and change modes (°C to °F or
vice versa).
3. Press the HEATER OFF button to switch the heater ON.
When either the TEMP or TEMP buttons are pressed, the digital display will indicate the temperature setting.After
five seconds, the display will return to the actual pool/spa temperature.
In addition to the digital temperature LED display, there are five indicator LEDs:
The POOL ON light indicates that the pool water temperature is governing operation of the heater.
The SPA ON light indicates that the spa water temperature is governing operation of the heater.
The HEATING light comes on and stays on when the heater’s burner chamber is firing.This light should be on whenever
the burner is on. This light blinks when the heater is calling for heat but not firing. If this light is on but the burner fails to
come on, one of the “service” lights should come on, indicating a fault in the system.
The SERVICE SYSTEM light indicates that there is insufficient water flow to the heater. If the pump is operating, this
usually indicates that the filter and/or skimmers should be cleaned (some filters may require back-washing). If the light
remains on after the filter/skimmers have been serviced, the system should be checked by a qualified service technician.
The SERVICE HEATER light indicates a fault in the heater or its controls. If this light comes on, shut down the heater
(See “TOTURN OFF GAS TOTHEAPPLIANCE” on page 4), and have a qualified service technician check the system.

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| 3
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. Operations
Operation Instructions
FOR YOUR SAFETY: READ BEFORE LIGHTING
START-UP AND OPERATION
START-UP AND SHUTDOWN INSTRUCTIONS ARE ON THE LABEL ATTACHED TO THE COVER OF THE
APPLIANCE CONTROL BOX.
NOTICE: UPON INSTALLATION THE INSTALLER MUST INSTRUCT THE USER IN THE OPERATION AND SAFETY
DEVICES AND PROVIDE A COPY OF THE HEATER’S USER’S GUIDE.
BEFORE START-UP
MASTERTEMP 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 property damage.
WARNING
A. This appliance does not have a pilot. It is equipped with
anignitiondevicewhichautomaticallylightstheburners.
Do not try to light the burners by hand.
B. BEFORE OPERATING, smell all around the
appliance area for gas. Be sure to smell next to the floor
because some gas is heavier than air and will settle on
the floor.
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
inyourbuilding.
– 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
setting by hand, don't try to repair it, call a qualified
servicetechnician. Forced or attempted repairmayresult
in a fire or explosion.
D. Do not use this heater if any part has been under water.
Immediatelycall a qualified service techniciantoinspect
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
properly filled with water.
F. Before operating the appliance for the first time or after
it has been off for an extended time, perform the
followingchecklist:
1. Remove debris or other articles frominsidetheheater
and the area around the heater and its exhaust vent.
Makesurethe ventilation openings are clearofdebris
orobstruction. For installationsin an enclosed space,
make sure openings for combustion and ventilation
air are unobstructed.
2. Keep heater area clear and free from combustibles,
flammable liquids and chemicals.
3. Check that all water connections are tight.
4. Water must be flowing through the heater during
operation.Makesurethatpool/spa is filled with water
and have pump operating. Check that water flow is
unobstructedfrom the appliance. Whenoperating for
the first time or after an extended shut-down, run
filter pump for several minutes to clear all air from
the system.
THE MASTERTEMP HEATER IS INTENDED FOR INSTALLATION WITH A METERED GAS PRESSURE REGULATOR.
WARNING! DO NOT INTERFERE WITH ANY SEALED COMPONENTS. THIS CAN ONLY BE
DONE BY A QUALIFIED SERVICE PROFESSIONAL.

MASTERTEMP™Pool and Spa Heater Installation and User’s Guide P/N 475106 Rev. D 1/2016
4 | Section
OPERATING INSTRUCTIONS
1. STOP! Read the safety information on (page v - vii).
2. Set both pool and spa thermostats to the lowest
settings.
3. Turn off all electric power to the appliance.
4. This appliance doesnothaveapilot.Itisequipped
withanignitiondevicewhichautomaticallylights
the burner. Do not try to light the burner by hand.
5. Turn offthe outside external manual shut-off gas
valve, see Figure 1.
6. Wait five (5) minutes to clear out any gas. If you
thensmellgas,STOP!Follow “B” in the “Before
Start-up”instructions (page 3). If youdon’tsmell
gas, go to the next step.
7. Turn on the outside external manual shut-off gas
valve, see Figure 1.
8. Set 3-way valves on inlet and outlet to pool or
spa, as appropriate.
9. Turn on all electric power to the appliance.
10. Press either the POOL ON or SPA ON button switch on the operating control.
11. Set the thermostat to desired setting (NOTICE: Set point must be above actual water temperature or burner will not
fire). See page 2 “OPERATING THE CONTROL PANEL”.
12. The blower should come on immediately, and after about 20 seconds, the burner should fire. When operating for the
first time, the burner may not fire on the first try because of air in the gas line. If it does not fire at first, push the OFF
switch, wait five minutes, and again push the POOL or SPA ON switch. The burner should fire after about 20
seconds. You may have to repeat this until all of the air has cleared the gas line.
13. The burner should fire until the pool/spa temperature reaches the desired 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, but the blower continues to run for about 45 seconds.
Should overheating occur or the gas supply fail to shut off, turn off the manual gas control valve to the appliance.
14. If the appliance will not operate, follow the instructions below “TO TURN OFF GAS TO THEAPPLIANCE”, and
call your service technician or gas supplier.
15. If the electrical power is lost while the heater is running, the heater will retain all program settings and the unit will
come back to it’s original mode and settings once the power is restored.
TOTURN OFF GASTO APPLIANCE
1. Press the OFF button on operating control.
2. Switch off all electric power to the unit.
3. Turn off the outside external manual shut-off gas valve, see Figure 1.
Figure 1.
External Manual
Shut-off Valve
1. Operations

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WARNING
SAFETY CONTROLS
AIR FLOW SWITCH (AFS)
The air flow switch, (see Figure 2), is a safety device used to insure that the
combustion air blower (fan) is operating and has been designed to monitor the
vacuum (negative) pressure within the blower housing. The air flow switch is
factorysetandisconnectedupstreamoftheignition module. The ignition module
does not operate unless the air pressure switch and all safety switches are
closed.
WATERPRESSURESWITCH
Hazardous pressure. Do not bypass the Water Pressure Switch or render it inoper-
able.
WATER PRESSURE SWITCH
The water pressure switch, (see Figure 3). If the water flow is restricted, the
water pressure switch may prevent the burner from firing and cause the
“Service System” light to go on. If the light remains on after the filter has
been serviced, have a qualified service technician check the system.
For deck-level heater installations, the Water Pressure Switch is factory set at
0.2 bar (3.00 psi). NOTE: See, Below Pool Level Installation instructions on
page 10. If the pressure switch is .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
when the pump is running. Turn the star-wheel on the switch clockwise
( ) to raise setting (heater below the pool) and counterclockwise
( ) to lower the setting (heater above the pool – see Figure 4. Test the
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 Pressure Switch is no
longer adequate.AFlow Switch must be installed instead.
NOTICE: Heater operation with incorrect
Pressure Switch setting may cause operation
with no water flow. Operation of the heater
without sufficient water flow may severely
damage it and will void the warranty.
HIGH LIMIT SWITCH
A “High Limit”, is a safety device that opens
the electrical circuit and shuts off the heater
based on a water temperature set point within
the “High Limit Device”. The MasterTemp
series of heaters contains two (2) high limit
devices which are located on the main inlet /
outlet header (see page 41 item 6).
Air Flow Switch
Figure 2.
Water
Pressure
Switch
Star Wheel
A reference scale is on
the back of pressure switch
Turn star wheel clockwise to raise
pressure set point if pressure switch is more
than 1.2 M (4 ft) below water level
Turn star wheel counterclockwise to lower
pressure set point if pressure switch is more
than 1.5 M (5 ft) above water level
1.2 M (4 ft)
1.5 M (5 ft)
Figure 3.
Figure 4.
Section 1. Operations
HAZARDOUS PRESSURE. DO NOT BYPASS THE WATER
PRESSURE SWITCH OR RENDER IT INOPERABLE.

MASTERTEMP™Pool and Spa Heater Installation and User’s Guide P/N 475106 Rev. D 1/2016
6 | Section
Diagnostic LED
1 Flash -Air Flow Fault
2 Flashes -Flame No Call For Heat
3 Flashes -Ignition Lockout
Flame Current
Check Point
Figure 5.
SAFETY CONTROLS, (continued)
OPERATION OF IGNITION MODULE
TheIgnition Module, (see Figure5), ismicroprocessor based and
operateson24VAC suppliedbythetransformer.Thecontrolutilizes
a microprocessor to continually and safely monitor, analyze, and
control the proper operation of the gas flame holder. The module
with the presence of the flame sensor, using flame rectification,
allows the heater to operate.
TEMPERATURE SETTING
The heater comes factory set at 25.6° C (78° F). for the pool mode and 37.8° C (100° F). for the spa mode. Using the up
and down arrows, you can 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. See below to change the heater’s factory set temperature
settings.
MAXIMUMTEMPERATURE SET POINT
1. Unbolt and remove the door panels (see Figure 6).
2. Accessthe control panelboard on theunderside of the topcover.
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 7).
The following sequence should happen:
1. The unit turns on and the POOL ON light will
turn on.
2. Press the TEMP or TEMP button (on TOP of the
control panel) to set maximum pool temperature.
3. Wait up to 30 seconds; the POOL ON light will turn off
and the SPA ON
light will turn on. To override the time
delay, push the Max.Temp.Set Point button again.
4. Press the TEMP or TEMP 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 turn off
and the unit will shut down. To override the time delay,
push the Max.Temp. Set Point
button again.
6. Reinstall the access door panels.
Door
Acces
s
Panel
Top Panel
Door
Access Panel
Figure 6.
S1
SET
MAX
S1
SET
MA
X
Figure 7.
1. Operations

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Installation Instructions
Gas
Air
Mixer
Blower
Inlet
(Cold
Water)
Exhaust
Heating Coils
Outlet
(Mixed
Water) Burner
Figure 8.
THIS PRODUCT MUST BE INSTALLED AND SERVICED BY A PROFESSIONAL SERVICE TECHNICIAN, QUALIFIED IN POOL
HEATERINSTALLATION.THEMASTERTEMPHEATERISINTENDEDFORINSTALLATIONWITHAMETEREDGASPRESSURE
REGULATOR.
Pentairstronglyrecommendsthatallvents,pipesandexhaustsystemsbeinitiallyandperiodicallytestedforproperoperation.Thistesting
canbeaccomplishedbyusingahand-heldcarbonmonoxidemeterand/orbyconsultingwithagasprofessional.
Poolheatersmustbeusedinconjunctionwithcarbonmonoxidedetectorsinstallednearthepoolheater.Thecarbonmonoxidedetectorsmust
beperiodicallyinspectedforproperoperationsoastoinsurecontinuedsafety.
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 European Standard Codes of Practice.
NOTICE:UPONINSTALLATIONTHEINSTALLERMUSTINSTRUCTTHE
USER IN THE OPERATION AND SAFETY DEVICES AND PROVIDE A
COPY OF THE HEATER’S USER’S GUIDE (THIS MANUAL).
HEATER DESCRIPTION
Figure 8 is a diagram of the heater showing how it operates. Precisely
matchedorifice plates meter theair and gas intothemixer.Theblower
draws the air and gas through the mixer and forces it into the burner’s
flame holder. A sealed heat exchanger surrounds the flame holder,
discharging exhaust gases out the flue.
63mm(2in-UK)PVC water piping connects directly to the manifold/
header on the heat exchanger using 63 mm (2 in - UK) PVC slip
unions provided with the heater. The outer manifold remains cool; no
heat sinks are required. A thermal regulator and an internal bypass
regulate the water flow through the heat exchanger to maintain the 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 operatingcontrol, the burner controllersupplies power to the
combustion airblower through a series of safety interlocks. The interlocks consist of:
• the pressure switch (PS), which senses that the pump is running,
• the high limit switch (HLS), which opens if the heat exchanger outlet temperature goes above 55° C (131° F), and
• the air flow switch (AFS), which senses the pressure drop across the air metering orifice,
• the automatic gas shut-off (AGS) switch, which opens if the heat exchanger outlet temperature goes above 60° C (140° F).
• the inlet temperature control switch, which opens if the inlet temperature goes above 45° C (110° F).
• the stack flue sensor (SFS), which shuts down the heater if the flue gas temperature reaches 249° C (480° F).
The air flow switch (AFS) senses the pressure drop across the air metering orifice.As soon as there is sufficient air flow,
theAFS closes, closing the circuit to the hot surface igniter (HSI), which ignites the fuel mixture. On a call for heat, the
blower and HSI are energized. In about 20 seconds, the gas valve opens and ignition occurs. The HSI then switches to a
sensing mode and monitors the flame.
The heater is equipped with a digital operating control that enables the user to pre-set the desired pool and spa water
temperatures. The control enables the user to select between pool and spa heating, and features a digital display that
indicates the water temperature.
Section 2. Installation

MASTERTEMP™Pool and Spa Heater Installation and User’s Guide P/N 475106 Rev. D 1/2016
8 | Section
These installation instructions are designed for use by qualified personnel only, trained especially for installation of this
type of heating equipment and related components. Some states require installation and repair by licensed personnel. If
this applies in your state, be sure your contractor bears the appropriate license. See Figure 9 for Outdoor Installations.
SPECIFICATIONS
Figure 9.
533 mm
(21")
828 mm
(31”)
585 mm
(23")
715 mm
(28")
406 mm
(16")
TOPFRONT
EXHAUST SIDE PLUMBING SIDE
257 mm
(10")
142 cm
(6")
ELECTRICAL
CONDUIT PORT
578 mm
(23")
406 mm
(16")
715 mm
(28")
63 mm
(2" - UK)
DIMENSIONS IN CENTIMETERS & INCHES
PUTTINGTHE 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
setting should be adjusted. See “WATER PRESSURE SWITCH” in the “SAFETY CONTROLS Section” (page 5) and
the “CAUTION” under “BELOW POOL INSTALLATION Section” (see page 10).
Before putting the heater into service for the first time, follow the instructions under “BEFORE START-UP” (page 3) in
the front of this manual. Check for proper operation of the heater by following the steps under, see page 4 “OPERATION
INSTRUCTIONS.”
Notice: Damage to equipment caused by improper installation or repair will void the warranty.
1. Installation

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| 9
PUMP
FILTER
POOL
HEATER
MANUAL
BY-PASS
TO
POOL
GATE
VALVE
FROM
POOL
PLUMBING CONNECTIONS
The MasterTemp™ heater has the capability of direct PVC
waterpipingplumbing connections. Asetof bulkhead fittings
is included with the MasterTemp to insure conformity with
Pentair’s recommended PVC plumbing procedure. Other
plumbingconnectionscanbeused.SeeFigure11 for plumbing
connections.
CAUTION
Before operating the heater on a new installation, turn on
thecirculation pumpandbleedallthe airfrom thefilter 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.
VALVES
When any equipment is located below the surface of the pool or spa, valves should be placed in the circulation piping
system to isolate the equipment from the pool or spa. Check valves are recommended to prevent back-siphoning. Back-
siphoning is most likely to occur when the pump stops, creating a pressure-suction differential. Do 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)
Where the water flow rate exceeds the maximum 454 L/m, a manual
bypass should be installed and adjusted. After installing the valve, adjust
the valve to bring the flow rate within the acceptable range. Then remove
the valve handle or lock it in place to avoid tampering. See Figure 11.
Figure 10.
Table 1.
Cool water in
Warm water out
Outlet to pool
Inlet to heater
1. Set Manual By-Pass Valve.
2. Remove Handle.
See page 33 for Pressure Relief Valve Installations.
Figure 11.
ledoM)MPG(m/L.niM*)MPG(m/L.xaM
002)02(67)021(454
003)03(411)021(454
004)04(251)021(454
dednemmocermumixamehtdeecxetonoD* .gnipipgnitcennocehtrofetarwolf
Section 2. Installation

MASTERTEMP™Pool and Spa Heater Installation and User’s Guide P/N 475106 Rev. D 1/2016
10 | Section
Pool
Main
Drain Spa
From Pool 3-Way
Valve
3-Way
Valve
3-Way
Valve
Chlorinator
Heater
Pump
Check Valve
Filter
WATER CONNECTIONS
The heater requires proper water flow and pressure for its
operation. See Figure 12 for the recommended installation.
Thefilterpumpdischargestothefilter,the filterdischarges to
the heater, and the heater discharges directly to the pool or
spa.
A manual bypass valve should be installed across the heater
when the pump flow exceeds 454 L/m (120 GPM). See
“WATER FLOW RATE” on page 9 - Table 1 for setting of
the manual by-pass valve.
Make sure that the outlet plumbing from the heater contains
noshut-offvalvesorotherflow restrictions that could prevent
flowthroughtheheater(exceptforbelowpoolasnotedbelow,
orwinterizingvalves where needed).Toswitch flow between
the pool and spa, use a diverter valve. Do not use any valve
that can shut off the flow. Do not use a shut-off valve to
isolatetheheaterunless it is below the level of thepoolorspa.
Install the chemical feeder downstream of the heater. Install
a chemical resistant one-way check valve between the heater and the chemical feeder to prevent back-siphoning through
the heater when the pump is off.
NOTICE: If the heater is plumbed in backwards, it will cycle continuously. Make sure piping from filter is not reversed
when installing heater.
Connect the heater directly to 63 mm (2 in - UK) PVC pipe, using the integral unions provided. Heat sinks are not
required. The low thermal mass of the heater will prevent overheating of the piping connected to the pump even if the
heater shuts down unexpectedly. Occasionally a two-speed pump will not develop enough pressure on the low speed to
operate the heater. 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 (for
example by leaves), there may not be adequate flow to the heater. Do not rely on the pressure switch in this case.
If European Standard Codes of Practice require the installation of a pressure relief valve (PRV), see page 33 for
“PRESSURE RELIEF VALVE INSTRUCTIONS”.
BELOW POOL INSTALLATION
If the heater is below water level, the pressure switch must be adjusted. This adjustment must be done by a qualified
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 0.20 bar (3.00 psi). This setting is for a heater installed at pool
level. If the heater is to be installed more than 0.3 m above or below, the water pressure switch must be adjusted by a
qualified service technician. See page 33, Figure 32.
FLOW SWITCH INSTALLATION
If the heater is installed more than 1.5 m above the pool or more than 1.2 m below the pool level, you will be beyond the
limits of the pressure switch and a flow switch must be installed. 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 in place of the water pressure
switchwires.
Figure 12.
2. Installation

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| 11
GAS CONNECTIONS
GAS LINE INSTALLATIONS
Thegassupply mustbeinstalledin accordancewith the European Standard Codes of Practice for gasinstallation asapplicableand
allapplicablelocalcodes.
THE MASTERTEMP HEATER IS INTENDED FOR INSTALLATION WITH A METERED GAS PRESSURE REGULATOR.
Beforeinstallingthegasline,besuretocheckwhichgastheheaterhasbeendesignedtoburn.Thisisimportantbecausedifferent
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 to the heater. The table is
for G20 and G25 at a specific gravity of .65 and G31 at a specific gravity of 1.55.
Whensizinggaslines,calculate0.9additionalmetersofstraightpipeforeveryelbowused.Wheninstallingthegasline,avoidgetting
dirt,greaseorotherforeignmaterialinthepipeasthismaycausedamagetothegasvalve,whichmayresultinheaterfailure.
The gas meter should be checked to make sure that it will supply enough gas to the heater and any other appliances that may
be used on the same meter. Insufficient gas supply will cause the heater to operate below its designed performance or 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.
Installamanualshut-offvalvethatconformswithEuropeanStandardCodes of Practice, and a sediment trap/drip leg and union
located outside the heater panels, see Figure 13. Do not use a restrictive gas cock.
Theheaterandany othergasappliancesmustbe disconnected fromthegassupply piping systemduringanypressure testing onthat
system,(greaterthan6.0kPa).Theheaterandits gas connection must be leak tested beforeplacingtheheaterinoperation.Do not
useflame to test thegasline.Use soapy water or another nonflammable method.
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.
GAS PIPE SIZING
SEDIMENT TRAP/DRIP LEG
Install a sediment trap/drip leg and union located outside the
heater panels in accordance with European Standard Codes of Practice requirements. Do not use a restrictive gas cock.
The sediment trap/drip leg shall be either a tee fitting with a capped nipple in the bottom outlet which can be removed for
cleaning, as illustrated in Figure 14, or an other device recognized as an effective sediment trap/drip leg.All gas piping
should be tested after installation in accordance with local codes.
Figure 13.
Manual
Shut-off
Valve
Sediment
Trap/Drip Leg
Union
At least 23 cm (9")
At least 8 cm (3")
2.54 cm (1") Dia. or larger
(See "Recommended
Pipe Sizes" Chart
)
45-60 cm x 3/4 in
(18–24" of 3/4")
Gas line from
Valve
Bell
Reducer
Table 2.
eziSretaeH reteMehtmorfecnatsiD
m51ot0m03ot61m06ot13
002mm52mm23mm23
003mm23mm23mm04
004mm23mm04mm05
Section 2. Installation

MASTERTEMP™Pool and Spa Heater Installation and User’s Guide P/N 475106 Rev. D 1/2016
12 | Section
TESTING GAS LEAKS AND GAS PRESSURE
Table 3.
THEMASTERTEMPHEATER IS INTENDEDFOR INSTALLATIONWITH A METERED GASPRESSURE REGULATOR.
Before operating the heater, the heater and its gas connections must be leak tested. Do NOT use an open flame to test
for leaks. 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 (60 mbar).
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.
These instructions are for the use of qualified service technicians only!
1. Shut off the gas supply to the heater.
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.
8. Shut off the gas supply to the heater.
9. Disconnect the manometer hose.
10. Tighten the small screw inside the pressure tap.
11. Open the gas supply to the heater.
12 Verify that the seal connection in the pressure tap is closed by testing
for leaks with soapy water.
Note: If the pressure reading is out of range, (see Table 3), regulate the
incoming gas pressure.
noitpircseDepyTerusserPylppuSsaG
saGlarutaN LLE2;iE2,sE2;N2;+E2;H2 )52G/02G( rabm52-02
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:ETON ehtdeecxetonoD.tnemtsujdatupnirofdevorppaeulavmuminimehT .erusserpylppusmumixam .gnitareposiretaehelihwnekatebtsumsgnidaerllA sgnidaerrostnemtsujdaynA .smelborpecnamrofrepnitluserlliwffosiretaehelihwedam
Lightly loosen the
small screw inside the pressure tap,
and attach/connect the manometer hose.
Figure 14.
INLET GAS PRESSURE REQUIREMENTS
This appliance is equipped with an unconventional gas control valve that is factory set with a manifold pressure of
1.1 ± 0.5 mbar. Installation or service must be performed by a qualified installer, service agency, or the gas supplier. If
this control valve is replaced, it must be replaced with an identical control. The combination gas valve incorporates dual
shut-off valves and a negative-pressure regulator. For proper operation, the regulated pressure at the outlet manifold of
the valve must be 1.1 ± 0.5 mbar below the reference pressure at the blower mixer inlet, and the gas valve ‘VENT’
tap must be connected to the end cap air orifice as shown in Figure 14. 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.
2. Installation