Pentair MASTERTEMP 200 HD User manual

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.
• 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.
• DO NOT PLACE ARTICLES ON 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.
• 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.
Pentair Water Australia Pty. Ltd.s AU/NZ – Head Office
1-21 Monash Drive, Dandenong South, Victoria 3175 – Australia • 1300.137.344 • Fax [phone]
1620 Hawkins Ave., Sanford, NC 27330, USA • [phone] • [phone]
10951 W. Los Angeles Ave., Moorpark, CA 93021, USA • [phone] • [phone]
For additional free copies of this manual; call AUS: 1300 137 344 - NZ: 0800 654 112.
240 VAC NATURAL GAS/LP GAS
MODELS Natural Propane
200HD (200 MJ/h) 460946 460949
300HD (300 MJ/h) 460945 460948
400HD (400 MJ/h) 460944 460947
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. As an additional measure of safety,
Pentair Water Australia Pty. Ltd. strongly recommends
installation of suitable Carbon Monoxide detectors in
the vicinity of this heater. Improper installation and/or
operation will void the warranty.
OWNER:
Retain For
Future
Reference
(FOR OUTDOOR USE ONLY*) INSTALLATION AND USER’S GUIDE
MASTERTEMP POOL AND SPA HEATER (AUSTRALIA)
Notice: MasterTemp Heaters are designed for use with NATURAL
and PROPANE gas only.
(*) For heater indoor use, see page 22.
ATTENTION INSTALLER: PLEASE GIVE THIS MANUAL
TO THE OWNER AND/OR OPERATOR ONCE INSTALLATION
IS COMPLETE.
www.pentairwater.com.au - www.pentair.com
WHAT TO DO IF YOU SMELL GAS

MasterTemp Pool and Spa Heater P/N 474131 Rev. M 8/2020
2
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 Identication Number (HIN).
Heater Identification Number (HIN)
The following example simplies the identication system:
1) MT : MasterTemp
2) Model Size : (200, 300 or 400) : Input rating (Mega Joule [MJ]/hr)
3) Construction : (HD = Heavy Duty Model)
4) Fuel Type : (LP = Propane gas or N= Natural gas)
Section 1. Heater Identification Information
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 = N = 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
AUSTRALIA ONLY
GAS SAFETY CERTIFICATION
DO NOT REMOVE
TM

P/N 474131 Rev. M 8/2020 MasterTemp Pool and Spa Heater
3
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, efcient, induced-draft, gas red high performance pool and spa heater that can be directly
connected to 50 mm PVC pipe. The MasterTemp heater also comes equipped with the Pentair 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 (230-240 VAC, 50 Hz) to operate.
SPECIAL INSTRUCTIONS TO OWNER: Retain this manual for future reference. This instruction manual provides
operating instructions, installation and service information for the MasterTemp high performance heater. The information
in this manual applies to all MasterTemp models. READ AND REVIEW THIS MANUAL COMPLETELY, it is very
important that the owner/installer read and understand the section covering installation instructions, and recognize the local
and state codes before installing the MasterTemp. Its use will reduce service calls and chance of injury and will lengthen
product life. History and experience has shown that most heater damage is caused by improper installation practices.
IMPORTANT NOTICES
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 Australia Pty. Ltd. AU/NZ, AUS – at 1300 137 344 or + 61 3 9709 5800.
WARRANTY INFORMATION
The MasterTemp pool heater is sold with a limited factory warranty.
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 specications 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 2. Introduction
THE MASTERTEMP HEATER MUST BE INSTALLED BY A REGISTERED INSTALLER OR A
QUALIFIED GAS PLUMBER AND SERVICED BY A PROFESSIONAL SERVICE TECHNICIAN,
QUALIFIED IN POOL HEATER INSTALLATION. SUCH INSTALLATIONWILL COMPLYWITH CODE
REQUIREMENTS LISTED ON PAGE 4.
NOTICE:THE MASTERTEMP HEATER IS INTENDED FOR INSTALLATION WITH A METERED GAS PRESSURE
REGULATOR CAPABLE OF DELIVERING 1.0 - 6.0 kPa GAS PRESSURE TO THE MASTERTEMP GAS VALVE.

MasterTemp Pool and Spa Heater P/N 474131 Rev. M 8/2020
4Section 2. Introduction
CODE REQUIREMENTS
Installation must be in accordance with the following:
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.
• Manufacturer’s Gas Installation Instructions
AS/NZS 5263.1.12:2019
• Local Gas Fitting Regulations,
• Municipal Building Codes,
• S.A.A. Wiring Code,
• Local Electrical Regulations
• Any other statutory regulations
• SANS 10087-1 or SANS 827
AUSTRALIA ONLY
GAS SAFETY CERTIFICATION
DO NOT REMOVE
TM
CONSUMER INFORMATION AND SAFETY
WARNING
The U.S. Consumer Product Safety Commission warns that carbon monoxide is an “invisible killer”. Carbon monoxide
is a colorless and odorless gas.
WARNING
The U.S. Consumer Product Safety Commission warns that elevated water temperature can be hazardous.
See below for water temperature guidelines before setting temperature.
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.
1. Spa or hot tub water temperatures should never exceed 40° C. A temperature of 37° C. is considered safe for a healthy adult. Special
caution is suggested for young children. Prolonged immersion in hot water can induce hyperthermia.
2. Drinking of alcoholic beverages before or during spa or hot tub use can cause drowsiness which could lead to unconsciousness and
subsequently result in drowning.
3. Pregnant women beware! Soaking in water above 37° C. can cause fetal damage during the rst three months of pregnancy (resulting
in the birth of a brain-damaged or deformed child). Pregnant women should stick to the 37° C. maximum rule.
4. Before entering the spa or hot tub, the user should check the water temperature with an accurate thermometer. Spa or hot tub
thermostats may err in regulating water temperatures by as much as 3° 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.
1. Carbon monoxide is produced by burning fuel, including natural gas and propane.
2. Proper installation, operation and maintenance of fuel-burning appliances in the home is the most important factor in reducing carbon
monoxide poisoning.
3. Be sure that fuel burning appliances such as heaters are installed by professionals according to manufacturer’s instructions and codes.
4. Always follow the manufacturer’s directions for safe operation.
5. Have the heating system (including vents) inspected and serviced annually by a trained service technician.
6. Examine vents regularly for improper connections, visible cracks, rust or stains.
7. Install battery-operated carbon monoxide alarms. The alarms should be certied to the requirements of the most recent UL, IAS,
CSA and IAPMO standard for carbon monoxide alarms. Test carbon monoxide alarms regularly and replace dead batteries.
WARNING DO NOT MODIFY THIS APPLIANCE

P/N 474131 Rev. M 8/2020 MasterTemp Pool and Spa Heater
5
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 installers be licensed.
Check with your local building authority about contractor licensing requirements. 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, LEAVE THE
VICINITY OF THE POOL OR SPA AND GET INTO FRESH AIR IMMEDIATELY. THE POOL HEATER
MUST BE THOROUGHLY TESTED BY A GAS PROFESSIONAL BEFORE RESUMING OPERATION.
EXCESSIVE CARBON MONOXIDE EXPOSURE CAN CAUSE BRAIN DAMAGE OR DEATH.
Install this pool heater far from open windows, doors, vents and other openings, see page 21 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 11 ± 5 Pa. 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 heater
set up for natural gas on propane gas or vice versa. Only qualified service technicians should attempt to
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. The heater is available for
use with natural gas or LP (propane) gas only. It is not designed to operate with any other fuels. Refer to
the nameplate for the type of gas the heater is equipped to use.
• Use heater only with the fuel for which it is designed.
• If a fuel conversion is necessary, refer this work to a qualified service technician or gas supplier
before putting the heater into operation.
SAFETY INFORMATION
Section 2. Introduction

MasterTemp Pool and Spa Heater P/N 474131 Rev. M 8/2020
6
SAFETY INFORMATION, (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 propane gas storage. Propane (LP) 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 Liquefied Petroleum Gases (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.
WARNING — Risk of asphyxiation if exhaust is not correctly vented. Follow venting instructions exactly
when installing heater. Do not use a drafthood 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 230-240 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.
• This heater is design certified by IAPMO as complying with the Standard for Gas Fired Pool Heaters, and is 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 230-240 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.
• The heater may not be installed within 3000 mm of the inside surface of a pool or spa unless it is separated by a
solid fence, wall or other permanent barrier.
Vent
Cover

P/N 474131 Rev. M 8/2020 MasterTemp Pool and Spa Heater
7
Customer Service
If you have questions about ordering Pentair replacement parts, and pool products, please use the following
contact information.
Customer Service and Technical Support, AUS
(9 AM - 5PM, Mon - Fri, Australia Wide)
Phone: [phone]
Fax: [phone]
New Zealand (9 AM - 5PM, Mon - Fri, NZST)
Phone:[phone]
Fax: [phone]
National Dealer Locator
Phone: [phone]
[e-mail]
Web sites
visit www.pentair.com.au
Pentair Water Pool and Spa, Inc. AU/NZ – Head Office:
1-21 Monash Drive, Dandenong South, Victoria 3175 – Australia • 1300.137.344 • Fax [phone]
Pentair Water Pool and Spa, Inc. USA:
1620 Hawkins Ave., Sanford, NC 27330 – USA • [phone] or [phone]
10951 West Los Angeles Ave., Moorpark, CA 93021 – USA • [phone] or [phone]

MasterTemp Pool and Spa Heater P/N 474131 Rev. M 8/2020
8Contents
Product HIN / Code Requirements / Safety Warning .............................................................................................. 2-10
Safety Warnings ...................................................................................................................... 3
Important Notices / Warranty Information............................................................................................................................................. 3
Code Requirements.............................................................................................................................................................................. 4
Consumer Information and Safety Information..................................................................................................................................... 5
General Specifications.......................................................................................................................................................................... 6
Section 1. Installation.............................................................................................................. 10
Heater Description................................................................................................................................................................................ 10
Sequence of Operation......................................................................................................................................................................... 10
Putting the Heater into Service............................................................................................................................................................. 10
Specifications ....................................................................................................................................................................................... 11
Plumbing Connections.......................................................................................................................................................................... 12
Valves................................................................................................................................................................................................... 12
Manual By-Pass ................................................................................................................................................................................... 12
Automatic By-Pass ............................................................................................................................................................................... 13
Below Pool Installation ......................................................................................................................................................................... 13
Water Connections ............................................................................................................................................................................... 14
Multiple Heater Installation ................................................................................................................................................................... 15
Gas Connections .................................................................................................................................................................................. 16
Gas Pipe Sizing .................................................................................................................................................................................... 16
Sediment Trap/Drip Leg ...................................................................................................................................................................... 16
Gas Pipe Escutcheon Installation ........................................................................................................................................................ 17
Testing Gas Leaks and Gas Pressure ................................................................................................................................................ 18
Inlet Gas Pressure Requirements ...................................................................................................................................................... 19
Outdoor Installation / Heater Clearances ............................................................................................................................................. 19 - 20
Indoor Venting—General Requirements Heater Clearances / Indoor Installation . Outdoor Shelder................................................... 22
Vent Installation (Indoor Installation or Outdoor Shelter) - Vertical Venting .................................................................................... 19-25
Horizontal Venting - Using Single-Wall Stainless Gas Vent ........................................................................................................... 26-27
Connecting Single-Wall Stainless Steel Vent to the Heater ............................................................................................................. 28
Horizontal or Vertical Venting Flexible Duct (Flex-Vent) ................................................................................................................. 29
Combustion Air Supply / Corrosive Vapors and Possible Causes ....................................................................................................... 30
Direct Air Intake Duct with 3-inch PVC Pipe (Indoor Installation) ......................................................................................................... 31
Control Panel Indexing ......................................................................................................................................................................... 31
Final Installation Check ........................................................................................................................................................................ 31
Electrical Connections .......................................................................................................................................................................... 32
Heater Bonding..................................................................................................................................................................................... 33
Remote Control Connections (Fireman’s Switch Connection) ............................................................................................................. 34
Connecting the MasterTemp Heater to the IntelliCenter Control System Load Center via RS-485 ..................................................... 35-37
MasterTemp Heater Wiring Diagram.................................................................................................................................................... 38
MasterTemp Heater Electrical Schematic Ladder Diagram ................................................................................................................. 39

P/N 474131 Rev. M 8/2020 MasterTemp Pool and Spa Heater
9
Contents
Section 2. Operations (Start-Up / Before Start-Up) .............................................................................................. 40
Basic System Operation / START-UP OPERATION - HSI (Hot-Surface Ignition) Lighting/Operation ................................................. 40
Operating Instructions .......................................................................................................................................................................... 41
To Turn Off Gas to Appliance............................................................................................................................................................... 41
Safety Controls (Air Flow Switch / Water Pressure Switch / Hight Limits / Operation of Ignitiion Module)........................................... 42 - 43
Control Panel / Menu Navigation / Operating the Heater ..................................................................................................................... 44
Menu .................................................................................................................................................................................................... 45
Section 3. Troubleshooting .................................................................................................... 46
Initial Troubleshooting / Error and Fault Codes .................................................................................................................................... 47
Troubleshooting Flow Charts................................................................................................................................................................ 48
Heater Will Not Fire Troubleshooting (A, B) ..................................................................................................................................... 49 - 50
IGN is ON ALARMS: AGS, AFS, HLS, PS, E01 or 126 / SFS ............................................................................................................. 51 - 53
Burner / Heat Exchanger Troubleshooting ........................................................................................................................................... 54
Section 4. Maintenance........................................................................................................... 55
Care and Maintenance .................................................................................................................................................... 55
Checking the Gas Control Valve...................................................................................................................................... 55
De-Liming the Heater - Pressure Relief Valve (PRV ....................................................................................................... 56
Water Pipe Escutcheon Installation ................................................................................................................................. 57
After Start-Up................................................................................................................................................................... 58
Spring, Fall (Autumn) and Winter Operation................................................................................................................... 58
Maintaining Pool Temperature / Energy Saving Tips ...................................................................................................... 58
Chemical Balance............................................................................................................................................................ 59 - 60
Section 5. Replacement Parts ................................................................................................ 61
Replacement Parts............................................................................................................................................................................ 61 - 65

MasterTemp Pool and Spa Heater P/N 474131 Rev. M 8/2020
10 Section 1. Installation
Installation
Gas
Air
Mixer
Blower
Inlet
(Cold
Water)
Exhaust
Heating Coils
Outlet
(Mixed
Water)
Burner
Figure 1.
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.
HEATER DESCRIPTION
Figure 1 is a diagram of the heater showing how it operates. Precisely
matched orice plates meter the air and gas into the mixer. The blower
draws the air and gas through the mixer and forces it into the burner’s
ame holder. A sealed heat exchanger surrounds the ame holder,
discharging exhaust gases out the ue. 50 mm PVC water piping
connects directly to the manifold/header on the heat exchanger using
50 mm 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 ow 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 operating
control, the burner controller supplies power to the combustion air blower 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 ow switch (AFS), which senses the pressure drop across the air metering orice,
• 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 ue sensor (SFS), which shuts down the heater if the ue gas temperature reaches 249° C (480° F).
The air ow switch (AFS) senses the pressure drop across the air metering orice. As soon as there is sufcient air ow,
the AFS 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 ame. 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.
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
setting should be adjusted. See “WATER PRESSURE SWITCH” in the “SAFETY CONTROLS Section” (page 42) and
the “CAUTION” under “BELOW POOL INSTALLATION Section” (page 13). Before putting the heater into service
for the rst time, follow the instructions under “BEFORE START-UP” (page 40) in the front of this manual. Check for
proper operation of the heater by following the steps under “OPERATION INSTRUCTIONS.” Damage to equipment
caused by improper installation or repair will void the warranty.

P/N 474131 Rev. M 8/2020 MasterTemp Pool and Spa Heater
11
Section 1. Installation
These installation instructions are designed for use by qualied 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 2 for Outdoor Installations.
SPECIFICATIONS
Figure 2.
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)
RS-485
CONDUCTORS
PORT
DIMENSIONS IN CENTIMETERS & INCHES

MasterTemp Pool and Spa Heater P/N 474131 Rev. M 8/2020
12
PUMP
FILTER
POOL
HEATER
MANUAL
BY-PASS
TO
POOL
GATE
VALVE
FROM
POOL
PLUMBING CONNECTIONS
The MasterTemp heater has the unique capability of direct
PVC plumbing connections. A set of bulkhead ttings is
included with the MasterTemp to insure conformity with
Pentair’s recommended PVC plumbing procedure. Other
plumbing connections can be used. See Figure 3 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.
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 ow rate exceeds the maximum 454 LPM, a manual
bypass should be installed and adjusted. After installing the valve, adjust
the valve to bring the ow rate within the acceptable range. Then remove
the valve handle or lock it in place to avoid tampering. See Figure 4.
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 56 for Pressure Relief Valve Installation.
Model Min. (LPM) Max. (LPM) *
200 160 454
300 200 454
400 240 454
* DO NOT EXCEED THE MAXIMUM RECOMMENDED FLOW RATE FOR THE
CONNECTING PIPING.
Figure 3.
Figure 4.
Section 1. Installation

P/N 474131 Rev. M 8/2020 MasterTemp Pool and Spa Heater
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AUTOMATIC BY-PASS
Figure 5 shows a plumbing diagram for an automatic BY-PASS (IntelliValve). This in conjunction with an IntelliFlo
VSF pump can provide added longevity of the heater and increased cost savings of operation. A 3-Port valve with an
IntelliValve actuator is installed at the heater inlet. A check valve is installed at the heater oulet so that water cannot
ow back into the heater. See instructions for Automatic Bypass valve kit (P/N 462048) for setting the open and closed
position of the IntelliValve.
Figure 5.
BELOW POOL INSTALLATION
If the heater is below water level, the pressure switch must be adjusted. This adjustment must be done by a qualied
service technician. See following CAUTION before installation.
CAUTION
BELOW OR ABOVE POOL INSTALLATION
The water pressure switch is set in the factory at 20.6 kPa (± 5 kPa). 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 42.
FLOW SWITCH
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 switch wires.
Cold Water In
Hot Water Out To Pool
IntelliValve
Check
Valve
Section 1. Installation

MasterTemp Pool and Spa Heater P/N 474131 Rev. M 8/2020
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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 ow and pressure for its
operation. See Figure 6 for the recommended installation.
The lter pump discharges to the lter, the lter discharges
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 ow exceeds 454 LPM (120 GPM). See
“WATER FLOW RATE” Table 1 on page 12 for setting of
the manual by-pass valve.
Make sure that the outlet plumbing from the heater contains
no shut-off valves or other ow restrictions that could prevent
ow through the heater (except for below pool as noted below,
or winterizing valves where needed). To switch ow between
the pool and spa, use a diverter valve. Do not use any valve
that can shut off the ow. Do not use a shut-off valve to isolate
the heater unless it is below the level of the pool or spa.
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 lter is not reversed
when installing heater.
Connect the heater directly to 50 mm 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 ow to the heater. Do not rely on the pressure switch in this case.
Local codes may require the installation of a pressure relief valve (PRV), see page 56 for “PRESSURE RELIEF
VALVE” instructions..
Figure 6.
Section 1. Installation

P/N 474131 Rev. M 8/2020 MasterTemp Pool and Spa Heater
15
All plumbing on multiple heater installations must be done in parallel. See Figure 7 and Figure 8.
To prevent heater overheating and to ensure heater longevity, water ow to each heater must be balanced for
optimum operation. To meet recommended ow rates, be sure all installed pipes are installed in accordance with local
and state codes. To allow for proper operation and service clearance, maintain spacing to adjacent heaters. Heaters
installed too close to one another may encounter operational issues associated with exhaust fumes.
MULTIPLE HEATER INSTALLATION
OPTIONAL
2" Ball Valve Bypass
Extend 12” (305 mm)
past end heater inlet
for hydraulic balancing
Extend 12” (305 mm)
past end heater inlet
for hydraulic balancing
Figure 7. Two MasterTemp Heaters Plumbing Hydraulic Diagram
FILTER
Check Valves and Flow Meters
are optional on heater inlets
but help with system
balancing
TOP INLET PORT
(COLD WATER)
LOWER OUTLET PORT
(HOT WATER)
60-80 GPM/Unit (recommended).
Balance flow to each heater.
TOP INLET PORT
(COLD WATER)
LOWER OUTLET PORT
(HOT WATER)
Check Va lves and Flow Meters
are optional on heater inlets
but help with system
balancin g
Figure 8. Four MasterTemp Heaters Plumbing Hydraulic Diagram
Section 1. Installation

MasterTemp Pool and Spa Heater P/N 474131 Rev. M 8/2020
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GAS CONNECTIONS
GAS LINE INSTALLATIONS
The gas supply must be installed in accordance with the Gas Installation Code, AS/NZS 5601.1, as applicable 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 to the heater.
The table is for natural gas at a specic gravity of .65 and propane at a specic gravity of 1.55.
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 may
be used on the same meter. Insufcient 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. Gas supply companies
are increasingly supplying natural gas to new installations with 2.75 kPa; this means 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.
Install a manual shut-off valve that conforms with 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 6. 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.
Do not use ame to test the gas line. Use soapy water or another nonammable 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
Figure 9.
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.
Heater
Size
Distance from the Meter
0 to 15 m 16 to 30 m 31 to 60 m
200 25 mm 32 mm 32 mm
300 32 mm 32 mm 40 mm
400 32 mm 40 mm 50 mm
INSTALLING A SEDIMENT TRAP/DRIP LEG
INSTALL A SEDIMENT TRAP/DRIP LED AND UNION LOCATED OUTSIDE THE HEATER PANELS IN ACCORDANCE WITH
NATIONAL CODE 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 6, 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.
FOR NEW HEATER INSTALLATION: SEE PAGE 17 TO
INSTALL THE GAS PIPE ESCUTCHEON. THIS ENSURES
THE HEATER IS RODENT RESISTANT.
Section 1. Installation

P/N 474131 Rev. M 8/2020 MasterTemp Pool and Spa Heater
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The gas pipe escutcheon ensures the heater is rodent resistant. The following describes how to install the round
gas pipe escutcheon for a new heater installation. The gas pipe escutcheon should be installed when the gas pipe
is being installed to the heater. See page 61 for parts list.
To install the gas pipe escutcheon:
1. Place the gas pipe escutcheon over the gas pipe, see Figure 10.
2. Install the gas pipe as described in the heater manual.
3. Slide the escutcheon ush against the heater panel.
4. Hand-tighten the retention screw to secure the escutcheon in place.
Tool: Phillips Screwdriver
Gas Pipe Escutcheon Installation
Flange
Screw
Figure 9. Flange installed on the
pipe. Be sure the flange covers the
circular opening in the heater
panel.
Figure 10.
Section 1. Installation

MasterTemp Pool and Spa Heater P/N 474131 Rev. M 8/2020
18
TESTING GAS LEAKS AND GAS PRESSURE
Lightly loosen the
small screw inside the pressure tap,
and attach/connect the manometer hose.
Figure 11.
NOTE: “SEE MAINTENANCE SECTION, PAGE 55 FOR “CHECKING THE GAS CONTROL VALVE”
Before operating the heater, the heater and its gas connections must be leak tested. Do NOT use an open ame 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 (.87 psig).
TESTING THE GAS PRESSURE THROUGH THE COMBINATION GAS CONTROL VALVE
WARNING
Risk of fire and explosion. Improper installation, incorrect adjustment, 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. If it is necessary
to adjust the gas valve, this must be done by only by a qualified service agency. These instructions are for the use of qualified
service technicians only!
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 11. Figure 7.
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
on page 19), regulate the incoming gas pressure.
Section 1. Installation

P/N 474131 Rev. M 8/2020 MasterTemp Pool and Spa Heater
19
SHEET
METAL
BLOCKS
Hollow masonry blocks, not less than 100 mm (4 in) thick, (laid with ends unsealed and joints
matched for air circulation). Cover blocks with 0.75 mm (0.03 in) minimum galvanized sheet metal.
150 mm
(6 in) Min.
BASE FOR USE ON
COMBUSTIBLE FLOORS
150 mm
(6 in) Min.
Masonary blocks
100 mm (4 in) thick minimum
NOTE: The minimum value approved for input adjust-
ment. 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.
GAS PRESSURE MINIMUM MAXIMUM
NATURAL GAS 1.13 KPA 6.0 KPA
PROPANE GAS 2.75 KPA 6.0 KPA
OUTDOOR INSTALLATION
For heaters located outdoors, using the built-in stackless venting system.
DANGER
CARBON MONOXIDE GAS IS DEADLY – 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, LEAVE THE VICINITY OF THE POOL OR SPA AND GET INTO
FRESH AIR IMMEDIATELY. THE POOL HEATER MUST BE THOROUGHLY TESTED BY A GAS PROFESSIONAL BEFORE
RESUMING OPERATION.
EXCESSIVE CARBON MONOXIDE EXPOSURE CAN CAUSE BRAIN DAMAGE OR DEATH.
WARNING
Risk of explosion if a unit burning propane gas is installed in a pit or other low spot. Propane is heavier than air. Do not
install the heater using propane in pits or other locations where gas might collect. Consult your local building code officials to
determine installation requirements and specific installation restrictions of the heater relative to propane storage tanks and filling
equipment. Installation must meet the requirements for the Standard for the Storage and Handling of Liquid Petroleum Gases.
Consult local codes and fire protection authorities about specific installation restrictions.
Locate the heater in an open, unroofed area and on a level surface
that is protected from drainage or run-off. Install the heater in an area
where leaves or other debris will not collect on or around the heater.
It is recommended that a non-combustible base be a platform under
the heater constructed of hollow masonry blocks, not less than 100
millimeters (mm) thick (laid with ends unsealed and joints matched
for air circulation). Cover blocks with 0.75 mm (min.) galvanized
sheet metal, see Figure 12.
To avoid damage to the electronic components in the heater, take
care to prevent prolonged exposure to driving sources of water
(such as lawn sprinklers, heavy roof runoff, hoses, etc.). Avoid
operation in persistent, extreme, moist or salty environments.
In extreme weather, shut down the heater and disconnect the
power to it until the weather has moderated. In areas subject to
hurricanes or very high winds, purchase the Bolt Down Bracket
Kit, P/N 460738, see Figure 13.
Note 1: DO NOT locate the heater where it is exposed to a prevailing wind.
Note 2: Be sure the heater is level.
(Australia)
Lead
Anchor
For Heater mounting
bolts and clamps,
purchase separately
Bolt Down Bracket Kit,
Part No. 460738.
Figure 13.
INLET GAS PRESSURE REQUIREMENTS
Table 3.
Figure 12.
Section 1. Installation

MasterTemp Pool and Spa Heater P/N 474131 Rev. M 8/2020
20
HEATER CLEARANCES – OUTDOOR
IMPORTANT!
• In an outdoor installation it is important to ensure water is diverted
from overhanging eves with a proper gutter/drainage system.The heater
must be set on a level foundation for proper drainage.
• This unit shall not be operated outdoors at temperatures below -7o C.
The heater shall be located such that the heater’s ue terminal shall
comply with the Australian standard. (See Figure 15, page 21):
a) At least 300 mm below eaves, balconies and other projections
(Figure 14). * Where eaves have openings into the house or roof
space, the clearance required is 1500 mm.
b) At least 150 mm from a return wall.
c) At least 300 mm from an external corner.
d) At least 1000 m from a gas meter.
e) At least 500 mm from an electricity meter or fuse box. The prohibited area extends below the electricity
meter or fuse to ground level.
f) At least 75 mm from a drain pipe or soil pipe.
g) At least 150 mm horizontally from any building structure or obstruction facing a terminal.
h) At least 300 mm from any other ue terminal or combustion air intake.
i) At least 1500 mm from an openable window, door, non-mechanical air inlet, or any other opening into a
building with the exception of sub-oor ventilation.
j) At least 1000 mm from a mechanical air inlet, including a spa blower.
k) At least 1500 mm below an openable window, door, non-mechanical air inlet, or any other opening into a
building with the exception of sub-oor ventilation.
Where the heater is to be installed under a covered area, or in a recess, one of the following options shall be
applied to achieve ready dispersion of combustion products and avoidance of nuisance:
a) The covered area or recess shall be open on at least two sides and the terminal shall be located to ensure
a free ow of air across it is achieved; or
b) When on side is open, the ue terminal shall be within 500 mm of the opening, and discharging in the direction
of the opening. There shall be no other ue terminals, gas meter, electricity meter, fuse box or openings into
the building along the wall within the 500 mm distance. The ue terminal shall be located to ensure that a free
ow of air across it is achieved.
Orient the heater for convenient access to the water connections and the gas and electrical connections.
Check local building codes for setback (property line) requirements.
300 m or more
Figure 14.