Pentair MASTERTEMP User Manual

MASTERTEMP® POOL AND SPA HEATER

INSTALLATION AND USER’S GUIDE

FOR YOUR SAFETY - READ BEFORE OPERATING

If you do not follow these instructions exactly, a re or explosion may result, causing property damage, personal injury or loss of life. For additional free copies of this manual; call (800) 831-7133.

FOR YOUR SAFETY - This product must be installed and serviced by authorized personnel, qualied inpool/spa heater installation. Improper installation and/or operation can create carbon monoxide gas and ue gases which can cause

serious injury, property damage, or death. For indoor installations, as an additional measure of safety, Pentair Water Pool and Spa strongly recommends installation of suitable Carbon Monoxide detectors in the vicinity of this appliance and in

any adjacent occupied spaces. Improper installation and/or operation will void the warranty.

120/240 VAC NATURAL GAS/LP GAS

Models Natural Propane

175K BTU/HR 460792 460793 200K BTU/HR (ASME) 461000 461001

200K BTU/HR 460730 460731 200K BTU/HR (HD ASME) 461032 – 250K BTU/HR 460732 460733 250K BTU/HR (HD) 460806 – 250K BTU/HR (ASME) 460771 460772

250K BTU/HR (HD ASME) 461020 – 300K BTU/HR 460734 460735

400K BTU/HR 460736 460737 400K BTU/HR (HD) 460805 – 400K BTU/HR (ASME) 460775 460776

400K BTU/HR (HD ASME) 461021 –

OWNER:

Retain For

Future

Reference

Improper installation, adjustment, alteration, service or maintenance can cause propertydamage, personal injury or death. Installation and service must be performed by

a qualied installer, service agency or the gas supplier.

WHAT TO DO IF YOU SMELL GAS

• Do not try to light any appliance.

FOR

YOUR

• Do not touch any electrical switch; do not use any phone in your building.

• Immediately call your gas supplier from a neighbor’s phone.

SAFETY

DO NOT store or use gasoline or other ammable vapors and liquids in the vicinity of this or other appliances.

1620 Hawkins Ave., Sanford, NC 27330 • (800) 831-7133 or (919) 566-8000

10951 W. Los Angeles Ave., Moorpark, CA 93021

Rev. M 8/2020 MASTERTEMP Pool and Spa Heater Installation and User’s Guide

Pentair Inc.

• (800) 831-7133 or (805) 553-5000

MT 250NA ASME

MT = MASTERTEMP

FUEL TYPE =

CONSTRUCTION =

MODEL SIZE = BTU INPUT in 1000 of BTU / HR

H. I. N.

HEATER IDENTIFICATION NUMBER

ID DESIGNATOR FOR PENTAIR AQUATIC SYSTEMS MASTERTEMP HEATERS

STD = STANDARD MODEL

HD = HEAVY DUTY MODEL

ASME = ASME CERTIFIED MODEL

HD ASME = HEAVY DUTY ASME MODEL

NA = NATURAL GAS

LP = PROPANE GAS

Example:

1 2 3 4

Section 1. Heater Identiﬁcation Information

Section 1: Heater Identiﬁcation Information

To identify the heater, see 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).

a. HeaterIdenticationNumber(HIN)

The following example simplies the identication system:

1) MT : MasterTemp

2) Model Size : (175, 200, 250, 300 or 400) : Input rating (Btu/hr) X 1000

3) Fuel Type : (LP = Propane gas or NA = Natural gas)

4) Construction : (STD = Standard Model) (HD = Heavy Duty Model) (ASME = ASME Certied Model) (HDASME = Heavy Duty ASME Model)

HEATER IDENTIFICATION INFORMATION — (HIN)

MASTERTEMP Pool and Spa Heater Installation and User’s Guide Rev. M 8/2020

Section 2. Warning and Safety Instructions

Section 2: Warning and Safety Instructions

IMPORTANT SAFETY INSTRUCTIONS

READ AND FOLLOW ALL INSTRUCTIONS

SAVE THESE INSTRUCTIONS

MASTERTEMP

Pool and Spa Heater

Congratulations on your purchase of the MasterTemp Pool and Spa Heater. Proper installation and service of your new heating system and correct chemical maintenance of the water will ensure years of enjoyment. The MasterTemp

heater is a compact, lightweight, efcient, induced-draft, gas red high performance pool and spa heater that can be directly connected to schedule 40 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 heater requires an external power source (120/240 VAC 60 Hz) to operate. See Electrial Connections, page 32.

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 heater 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 heater. 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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 any more information, or if you have any questions regarding to this pool heater, please contact Pentair Water Pool and Spa at (800) 831-7133.

WARRANTY INFORMATION

The MasterTemp 125 pool and spa heater is sold with a limited factory warranty. Specic details are described on the warranty registration card which is included with the product. Return the warranty registration card after lling in the

serial number from the rating plate inside the heater.

Pentair has high standards of excellence include a policy of continuous product improvement resulting 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 68° F. WILL CAUSE HARMFUL CONDENSATION AND WILL DAMAGE THE HEATER AND VOID THE WARRANTY. Do not use the heater to protect pools or spas from freezing if the ﬁnal maintenance temperature desired is below 68° F., as this will cause condensation related problems.

Rev. M 8/2020 MASTERTEMP Pool and Spa Heater Installation and User’s Guide

Section 2. Warning and Safety Instructions

CODE REQUIREMENTS

Installation must be in accordance with all local codes and/or the latest edition of the National Fuel Gas Code, ANSI Z223.1 and the latest edition of the National Electrical Code, NFPA 70 (US).

Installation in Canada must be in accordance with the latest CAN/CGA-B149.1 or .2 and CSA C22.1 Canadian

Electric Code, part 1.

The heater, when installed, must be electrically grounded and bonded in accordance with local codes, or, in absence of local codes, with the National Electrical Code, ANSI/NFPA70 (US) or in Canada in accordance with the Canadian

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.

CONSUMER INFORMATION AND SAFETY

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.

1. Spa or hot tub water temperatures should never exceed 104° F (40° C). A temperature of 100° F (38° C) is considered safe for

a healthy adult. Special caution is suggested for young children.

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 102° F (39° 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 100° F (38° 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 4° F (2.2° 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.

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.

MASTERTEMP Pool and Spa Heater Installation and User’s Guide Rev. M 8/2020

Section 2. Warning and Safety Instructions

SAFETY INFORMATION

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.

CARBON MONOXIDE GAS IS DEADLY

DANGER —

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 toxic levels of 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.

NEVER use this pool heater indoors without speciﬁed ventilation system (and properly installed vent pipe).

NEVER use this pool heater in the home or in partly enclosed areas (such as garages), unless the

speciﬁed ventilation system is used. If used outdoors, install far from open windows, doors, vents and other openings.

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 — FOR YOUR SAFETY

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.

WARNING — This heater is equipped with an unconventional gas control valve that is factory set with

a manifold pressure of -.2 inches wc. 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.

Rev. M 8/2020 MASTERTEMP Pool and Spa Heater Installation and User’s Guide

Section 2. Warning and Safety Instructions

SAFETY INFORMATION, (cont’d.)

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.

WARNING — Risk of ﬁre or explosion from ﬂammable vapors. Do not store gasoline, cleaning ﬂuids, varnishes,

paints, or other volatile ﬂammable liquids near heater or in the same room with 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, CAN/CSA B149.2 (latest

edition) or ANSI/NFPA 58 (latest edition).

WARNING — Risk of ﬁre, carbon monoxide poisoning, or asphyxiation if exhaust venting system leaks. Only

qualiﬁed service technicians should attempt to service the heater, as leakage of exhaust products or ﬂammable gas may result from incorrect servicing.

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. A vent conversion kit (See Page 29 for Part Numbers for Conversion Kits) is available for installations indoors (US and Canada). Use the speciﬁed venting, and only the speciﬁed venting, when heater is installed in an enclosure or

indoors.

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 120 or 240 Volt, 60 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.

MASTERTEMP Pool and Spa Heater Installation and User’s Guide Rev. M 8/2020

Section 2. Warning and Safety Instructions

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.

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.

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 CSA International as complying with the Standard for Gas Fired Pool Heaters, ANSI Z21.56/CSA 4.7, 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 is design certiﬁed by CSA International for installation on combustible ﬂooring. Speciﬁed minimum clearances must be maintained to combustible surfaces (see “Heater Clearances”, page 22).

• 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 5 ft. (1.5M ) of the inside surface of a pool or spa unless it is separated by a solid fence, wall or other permanent barrier.

Rev. M 8/2020 MASTERTEMP Pool and Spa Heater Installation and User’s Guide

Customer Service

8:00 AM to 8:00 PM

Phone: (800) 831-7133

Fax: (800) 284-4151

Visit www.pentair.com

Technical Support

Sanford, North Carolina (8:00 AM to 8:00 PM ET)

Phone: (919) 566-8000

Fax: (919) 566-8920

Moorpark, California (8:00 AM to 5:00 PM PT)

Phone: (805) 553-5000 - Fax: (805) 553-5515

Contents

Section 1. Heater Identication Information ......................................................................... 2

Section 2. Warning and Safety Information .......................................................................... 3

Important Notices ................................................................................................................................................................................. 3

Warranty Information ............................................................................................................................................................................ 3

Code Requirements .............................................................................................................................................................................. 4

Consumer Information and Safety Information ..................................................................................................................................... 4 - 7

General Speciﬁcations .......................................................................................................................................................................... 7

Section 3. Installation .............................................................................................................. 10

Heater Description ................................................................................................................................................................................ 10

Putting the Heater into Service ............................................................................................................................................................. 10

Speciﬁcations ....................................................................................................................................................................................... 11

Plumbing Connections .......................................................................................................................................................................... 12

Water Connections ............................................................................................................................................................................... 12

Multiple Heater Installation ................................................................................................................................................................... 13

Valves ................................................................................................................................................................................................... 14

Manual By-Pass ................................................................................................................................................................................... 14

Automatic By-Pass ............................................................................................................................................................................... 15

Below Pool Level Installation ................................................................................................................................................................ 15

Gas Connections .................................................................................................................................................................................. 16

Sediment Traps ................................................................................................................................................................................... 16

Gas Pipe Escutcheon Installation ......................................................................................................................................................... 17

Gas Pipe Sizing .................................................................................................................................................................................... 18

Testing Gas Pressure / Gas Pressure Requirements .......................................................................................................................... 19-20

Outdoor Installation Located Outdoor, Using the Built-In Stackless Venting System / Heater Clearances - Outdoor ......................... 20-21

Indoor Venting — General Requirements (Category I and Category III requirements) ...................................................................... 22

Heater Clearances — General Requirements (Indoor Installation US / Canada) ............................................................................. 22

Outside Vent Cover Removal ............................................................................................................................................................... 22

Combustion Air Supply / Direct Air Intake Duct with 3-inch PVC Pipe (Indoor Installation) ................................................................. 23-24

Corrosive Vapors and Possible Causes ............................................................................................................................................... 24

Vent Installation (Indoor Installation (Category 1) for US and Canada) ............................................................................................... 25

Vertical Venting - Negative Pressure ................................................................................................................................................... 25 - 29

Horizontal or Vertical Venting - Positive Pressure (Category III) ......................................................................................................... 29

Connecting Special Metalic Gas Vent to the Heater ............................................................................................................................ 29 - 32

Garage or Utility Room Installation (US & Canada) ............................................................................................................................. 32

Control Panel Positioning ..................................................................................................................................................................... 33

Final Installation Check ........................................................................................................................................................................ 33

Electrical Connections .......................................................................................................................................................................... 33-34

Heater Bonding ..................................................................................................................................................................................... 35

Remote Control Connections (Fireman’s Switch Connection) ............................................................................................................. 36

Connecting the MasterTemp Heater to the IntelliCenter Control System Load Center ........................................................................ 37-39

MasterTemp Heater Wiring Diagram .................................................................................................................................................... 40

MasterTemp Heater Electrical Schematic Ladder Diagram ................................................................................................................. 41

P/N 472592 Rev. M 8/2020

MASTERTEMP Pool and Spa Heater Installation and User’s Guide Rev. M 8/2020

Contents (Continued)

Section 4. Operation ................................................................................................................ 42

Basic System Operation ....................................................................................................................................................................... 42

MasterTemp HEater HSI (Hot-Surface Ignition) Ignition Lighting / Operation ...................................................................................... 42

Start-Up and Operation ....................................................................................................................................................................... 42

Before Start-Up / What to do if you smell gas ..................................................................................................................................... 42

OPERATING INSTRUCTIONS ........................................................................................................................................................... 43

To Turn Off Gas to Appliance ............................................................................................................................................................ 43

Safety Controls - Air Flow Switch (AFS) ............................................................................................................................................ 44

Water Pressure Switch ................................................................................................................................................................... 44

High Limits (Safety Device) ............................................................................................................................................................ 44

Operation Of Ingition Module .......................................................................................................................................................... 45

Control Panel Description ..................................................................................................................................................................... 46

Menu Navigation................................................................................................................................................................................... 46

Operating the Heater ............................................................................................................................................................................ 46

Menu ..................................................................................................................................................................................................... 46

Section 5. Troubleshooting .................................................................................................... 48

Initial Troubleshooting .......................................................................................................................................................................... 48

Error and Fault Codes .......................................................................................................................................................................... 48

Initial Troubleshooting and Troubleshooting Chart............................................................................................................................... 49

Heater Will Not Fire - A ...................................................................................................................................................................... 50

Heater Will Not Fire - B ...................................................................................................................................................................... 51

IGN is ON Alarms: AGS, AFS, HLS, PS Thermistor ......................................................................................................................... 52

Diagnostic Alarms: AGS, AFS, HLS, PS .......................................................................................................................................... 53

Diagnostics Alarms: SFS ................................................................................................................................................................... 54

Burner Troubleshooting ........................................................................................................................................................................ 55

Heat Exchanger Troubleshooting ......................................................................................................................................................... 55

Section 6. Maintenance ........................................................................................................... 56

Care and Maintenance ......................................................................................................................................................................... 56

Pressure Relief Valve (Not Factory Installed) ....................................................................................................................................... 56

Water Pipe Escutcheon Installation ...................................................................................................................................................... 57

After Start-Up (Checking Water Flow) .................................................................................................................................................. 58

Spring and Fall Operation ..................................................................................................................................................................... 58

Winter Operation .................................................................................................................................................................................. 58

Maintaining Pool Temperature ............................................................................................................................................................. 59

Energy Saving Tips .............................................................................................................................................................................. 59

Chemical Balance (Pool and Spa Water) ............................................................................................................................................. 59-60

Section 7. Replacement Parts ................................................................................................ 61-65

Rev. M 8/2020 MASTERTEMP Pool and Spa Heater Installation and User’s Guide

Gas

Air

Mixer

Blower

Inlet (Cold Water)

Exhaust

Heating Coils

Outlet (Mixed Water)

Burner

Section 3. Installation Instructions

Section 3: Installation Instructions

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.

Two inch PVC water piping connects directly to the manifold/ header on the heat exchanger using 2” 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

Figure 1.

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 135° F (57° C), 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 140° F

(60° C).

• the stackuesensor (SFS), which shuts down the heater if the ue gas temperature reaches 480° F (249° C).

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 and heater set point.

PUTTING THE HEATER INTO SERVICE

If the heater is installed below the level of the pool, or more than two feet above pool level, the pressure switch setting

should be adjusted. See WATER PRESSURE SWITCH, (page 44) in the SAFETY CONTROLS Section.

Before putting the heater into service for the rst time, follow the instructions under “BEFORE START-UP”

(page 42) in the front of this manual. Check for proper operation of the heater by following the steps under

“OPERATION INSTRUCTIONS.” (page 42) Damage to equipment caused by improper installation or repair will void the warranty.

MASTERTEMP Pool and Spa Heater Installation and User’s Guide Rev. M 8/2020

Section 3. Installation Instructions

SPECIFICATIONS

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 and Indoor

Installations.

DIMENSIONS IN INCHES AND CM

23.02"

(58.5 cm)

16"

(40.6 cm)

CONDUCTORS

RS-485

PORT

28.15"

(71.5 cm)

ELECTRICAL CONDUIT PORT

32.61"

(82.8 cm)

21.0"

(53.3 cm)

TOPFRONT

28.2"

(71.6 cm)

22.7"

(57.7 cm)

16.0"

(40.6 cm)

5.6"

(14.2 cm)

10.13"

(25.7 cm)

EXHAUST SIDE PLUMBING SIDE

Figure 2.

Rev. M 8/2020 MASTERTEMP Pool and Spa Heater Installation and User’s Guide

Pool

Main

Drain

Spa

From Pool

3-Way

Valve

3-Way

Valve

3-Way

Valve

Chlorinator

Heater

Pump

Check Valve

Filter

PUMP

FILTER

POOL HEATER

MANUAL BY-PASS

TO POOL

GATE VALVE

FROM POOL

Section 3. Installation Instructions

PLUMBING CONNECTIONS

The MasterTemp heater has the unique capability of direct schedule 40 PVC plumbing connections. A set of bulkhead ttings is included with the MasterTemp heater 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.

WATER CONNECTIONS

Figure 3.

The heater requires proper water ow and pressure for its

operation. See Figure 4 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 120 GPM (454 LPM). See “WATER FLOW RATE” on page 14 (Table 1) 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 pool installations 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.

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.

Figure 4.

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 2” 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. Note: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.

MASTERTEMP Pool and Spa Heater Installation and User’s Guide Rev. M 8/2020

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 5. 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 Valves and Flow Meters are optional on heater inlets but help with system balancing

Figure 6. Four MasterTemp Heaters Plumbing Hydraulic Diagram

Section 3. Installation Instructions

MULTIPLE HEATER INSTALLATION

All plumbing on multiple heater installations must be done in parallel. See Figure 5 and Figure 6. 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.

Rev. M 8/2020 MASTERTEMP Pool and Spa Heater Installation and User’s Guide

Cool water

Warm water out

Outlet to pool

Inlet to heater

1. Set Manual By-Pass Valve.

2. Remove Handle.

Section 3. Installation Instructions

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. Backsiphoning 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

Where the water ow rate exceeds the maximum 120 GPM, 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 7.

Table 1.

Figure 7.

MODEL MIN. (GPM) (LPM)

MAX. (GPM) (LPM)

175 20 (76) 120 (454)

200 20 (76) 120 (454)

250 25 (95) 120 (454)

300 30 (114) 120 (454)

400 40 (152) 120 (454)

* Do not exceed the maximum recommended ﬂow

rate for the connecting piping.

* Pumps 2 HP or larger can produce water pressure ﬂow in excess of 120 GPM. For these pumps, a BY-PASS VALVE is recommended.

Note: See page 56 for Optional Pressure Relief Valve installation, and water pipe size and measurements.

Note: See page 57 for Escutcheon rodent resistant location and installtion over water pipe

MASTERTEMP Pool and Spa Heater Installation and User’s Guide Rev. M 8/2020

Section 3. Installation Instructions

AUTOMATIC BY-PASS

Figure 7a 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.

IntelliValve

Cold Water In

Check Valve

Hot Water Out To Pool

Figure 7a.

BELOW POOL LEVEL 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 3.00 PSI (± 0.75 PSI). This setting is for a heater installed at pool level. If the heater is to be installed more than 1’ above or below, the water pressure switch must be adjusted by a

qualiﬁed service technician. See page 44, Figure 38 pool or more than 4’ 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.

FLOW SWITCH: If the heater is installed more than 5’ above the

Rev. M 8/2020 MASTERTEMP Pool and Spa Heater Installation and User’s Guide

Manual Shut-off Valve

Sediment Trap

Union

At least 9"

At least 3"

1" Dia. or larger

(See "Recommended Pipe Sizes" Chart)

18–24" of 3/4" Gas line from Valve

Bell Reducer

Section 3. Installation Instructions

GAS CONNECTIONS

FOR NEW HEATER INSTALLATION: SEE NEXT PAGE TO INSTALL THE GAS PIPE ESCUTCHEON.

GAS LINE INSTALLATIONS

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. The Table 2, shown on page 18, show which size pipe is 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 three (3) additional feet 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. 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.

The heater requires a gas supply of not less than 4” (10.2 cm) wc and not more than 14” (35.6 cm) wc. Gas supply pressures outside of this range may result in improper burner operation. A minimum owing or dynamic inlet pressure (while the heater is running) of 4” (10.2cm) wc is required to maintain input rating with no more than a 2” pressure

drop between static and dynamic. The gas supply must be installed in accordance with the National Fuel Gas Code, ANSIZ223.1, or standard CSA B149.1, Natural Gas and Propane Installation Codes, as applicable and all applicable local

codes. Install a manual shut-off valve and a sediment trap and union located outside the heater panels, see Figure 8. Do not use a restrictive gas cock. The following minimum gas pipe sizes are recommended for natural gas supply piping, see Table 2 on page 18. For low pressure LP gas, pipe size may be reduced by 1/4”, with a minimum pipe size of 1/2”.

Check for compliance with local codes.

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 ½ PSI). 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.

SEDIMENT TRAPS

Install a sediment trap and union located outside the heater panels in accordance with National code

requirements. Do not use a restrictive gas cock. The sediment trap shall be either a tee tting with

a capped nipple in the bottom outlet which can be

removed for cleaning, as illustrated in Figure 8, or an other device recognized as an effective sediment

trap. All gas piping should be tested after installation in accordance with local codes.

Figure 8.

MASTERTEMP Pool and Spa Heater Installation and User’s Guide Rev. M 8/2020

Section 3. Installation Instructions

Gas Pipe Escutcheon Installation

Required Parts: P/N 467107, Gas Pipe Escutcheon (PVC), P/N 270114, Phillips Retention Screw (#8)

1. IMPORTANT! Turn off the electrical supply to the heater and turn off the pump.

WARNING! Risk of ﬁre or explosion. Never test for gas leaks with an open ﬂame.

The following escutcheon installation instructions are intended for new pool installations only, not for retroﬁt purposes.

2. When installing the ¾” pipe into the gas valve, place the gas pipe escutcheon over the pipe so that the larger

circle is facing the heater’s service panel and the smaller circle with the screw is facing away for the heater

service panel (toward the union) as shown in Figure 9.

3. Slide the escutcheon ush against the outside of the heater service panel and the gas pipe opening. Be sure to

completely cover large gas pipe opening in the panel to prevent rodents to gain access to the inside of the heater.

4. Hand-tighten the retention screw to secure the escutcheon in place.

5. Safety check the gas pipe for leaks as instructed in BASIC SYSTEM OPERATIONS, page 42.

Knock-out

removed

from panel

Flange Screw

Gas Pipe

Figure 9. Flange installed on the gas pipe. Be sure the flange covers the circular opening in the heater panel.

Rev. M 8/2020 MASTERTEMP Pool and Spa Heater Installation and User’s Guide

Section 3. Installation Instructions

GAS PIPE SIZING

STAGE TWO “LOW PRESSURE” GAS PIPE SIZING

Table 2.

PIPE SIZING FOR GAS LINE CONNECTIONS

MAXIMUM EQUIVALENT PIPE LENGTH (Ft.)

Natural Gas at 1000 B.T.U. per Cubic Foot

Propane Gas at 2500 B.T.U. per Cubic Foot

1/2” 3/4” 1” 1-1/4” 1-1/2” 2” 2-1/2”

MODEL

175 - 20’ 30’ 80’ 125’ 250’ 450’ 600’ - - - - - -

200 - 20’ 30’ 80’ 125’ 250’ 450’ 600’ - - - - - -

250 - 10’ 20’ 50’ 70’ 150’ 250’ 500’ 600’ - - - - -

300 - - 10’ 30’ 50’ 100’ 200’ 350’ 400’ 600’ - - - -

400 - - - 10’ 20’ 60’ 100’ 150’ 200’ 450’ 400’ - - -

NAT PRO NAT PRO NAT PRO NAT PRO NAT PRO NAT PRO NAT PRO

MASTERTEMP Pool and Spa Heater Installation and User’s Guide Rev. M 8/2020

To Air Flow Switch

To Gas Valve Ve nt

Vent

Pressure Tap

To High Side of Differential Pressure Gauge

To Low Side of Differential Pressure Gauge

Pressure Tap Inlet

To Air Flow Switch

To Gas Valve Vent

Section 3. Installation Instructions

TESTING GAS PRESSURE

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 or another non-ammable method (see page 16).

The heater and its individual shut-off valve must be disconnected from the gas supply piping system during any pressure testing of that system at test pressures in excess of 1/2 psig (3.5 kPa).

The heater must be isolated from the gas supply system by closing its individual manual shut-off valve during any pressure testing of the gas supply at test pressures equal to or less than 1/2 psig (3.5 kPa).

CHECKING 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!

This appliance is equipped with an unconventional gas control valve that is factory set with a manifold pressure of –.2” (–0.5cm) wc. Installation or service must be performed by a qualied 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 –0.2” (–0.5cm) wc below the reference pressure at the blower mixer inlet, and the gas valve ‘VENT’ tap must be connected to the end cap air orice as shown

in Figure 10.

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.

Connection

for Service

Figure 10.

Connection

for Test

Rev. M 8/2020 MASTERTEMP Pool and Spa Heater Installation and User’s Guide

Lead Anchor

For Heater mounting bolts and clamps, purchase separately Bolt Down Bracket Kit, Part No.

460738.

Section 3. Installation Instructions

CAUTION

The use of Flexible Connectors (FLEX) is NOT recommended unless they are properly sized according to the supplier recommendations for the heater rating.

GAS PRESSURE REQUIREMENTS

Natural Propane

Gas Pressure Model

Inches W.C.

Maximum Inlet

Minimum Inlet

Manifold

NOTE: All readings must be taken while heater is operat-

ing. Any adjustments or readings made while heater is off will result in performance problems.

Table 3.

MT 14 14

MT 4 4

MT -0.2 ± 0.1 -0.2 ± 0.1

OUTDOOR INSTALLATION LOCATED OUTDOORS, USING THE BUILT-IN STACKLESS VENTING SYSTEM.

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, ANSI/NFPA 58 (latest edition) in the U.S., or CAN/CSA B149.2 (latest edition) in Canada. Consult local codes and ﬁre protection authorities about speciﬁc installation restrictions.

Locate the heater on a level surface in an open area 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.

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.

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 -20o F.

If the heater is located under a roof overhang, there must be at least three (3) feet (1m) of clearance

between the bottom of the overhang and the top of the heater exhaust vent, see Figure 11. If the

heater is under a roof overhang, the space around the heater must be open on three sides. DO NOT,underanycircumstances,installtheheaterunderANYdeck.

MASTERTEMP Pool and Spa Heater Installation and User’s Guide Rev. M 8/2020

Figure 11.

Section 3. Installation Instructions

3 ft. (1 M) or more

VENTING GUIDELINES

OUTDOOR INSTALLATION

Check local building codes

for setback requirements.

Force

Air Inlet

Property Line

SIDE VIEW

Building

From building wall

Exhaust Grill (Vent)

6 in

From window or door

Must be at least 3 ft. above any forced air inlet located within a 10 ft. radius.

Vent Termination:

Must be located 6 in. away from the building wall and the following distances away from any building wall openings, included but not limited to vented eaves, doors, windows, gravity air inlet:

4 ft. below, 4 ft. horizontally

For minimum exhaust vent clearances for all building openings, including but not limited to vented eaves, doors,

windows, gravity air inlet, see Figure 12, show below.

In Canada, the heater must be installed with the top of the vent at least 10 feet (3m) below, or to either side of, any

opening into a building.

Orient the heater for convenient access to the water connections and the gas and electrical connections.

Note: Check local building codes for installing the heater from any property line set back requirements (see the installation diagram below).

CAUTION

If installing the heater next to or near an air conditioning unit or a heat pump, allow a minimum of 36 in. (91.4 cm) between the air conditioning unit and the heater.

Figure 13.

Rev. M 8/2020 MASTERTEMP Pool and Spa Heater Installation and User’s Guide

Figure 12.

6 in.*

6 in.

(*) For service access, it is advisable to allow for

sufficient clearance on at least one door panel.

Section 3. Installation Instructions

INDOOR VENTING — General Requirements

The heater may be installed as a Category I or Category III appliance.

Vented Appliance (Category I) – Vertical only

An appliance that operates with a nonpositive vent static pressure and with a vent gas temperature that avoids excessive condensate production in the vent, see pages25-28.

Vented Appliance (Category III) – Vertical or Horizontal

An appliance that operates with a positive vent static pressure and with a vent gas temperature that avoids excessive condensate production in the vent, see pages29-32.

If you are considering connecting this heater to a pre-existing vent system, make sure that the vent system meets the appropriate venting requirements as given in this manual onpages22-32. If not, replace the vent system. DONOT use

a draft hood with this heater.

The MasterTemp heaters are capable of a 270-degree discharge rotation and operate with a positive vent static pressure and with a vent gas temperature less than 400° F (204° C). The total length of the horizontal run must not exceed the

length that is listed in Table5onpage24.

HEATER CLEARANCES General Requirements

INDOOR INSTALLATION (US / CANADA)

The following clearances must be maintained from combustible surfaces:

TOP...............................6 in. (15 cm)

EXHAUST SIDE ...........6 in. (15 cm)

HEADER SIDE .............6 in. (15 cm)

DOOR PANELS* .........6 in. (15 cm)

Note(*) For service access it is advisable to allow for sufcient clearance on at least one door panel. The heater is design certied by CSA International for installation on combustible ooring. For installation on carpeting, the heater must be mounted on a metal or wood panel that extends at least

three (3) inches beyond the base of the heater. If the heater is installed

in a closet or alcove, the entire oor shall be covered by the panel. On an outdoor shelter installation, the exhaust discharges into a vent pipe. Orient the heater so that the vent pipe does not interfere with adjustment

of the operating controls. The control panel located on the top panel can be rotated to any of the three sides of the heater for easy access. However, the control panel must not be located on the side where the vent is located.

Figure 14.

OUTSIDE VENT COVER REMOVAL

The heater is supplied from the factory with a built-in stackless outside

vent for outdoor installation. Remove the outside vent cover for outdoor shelter installation.

MASTERTEMP Pool and Spa Heater Installation and User’s Guide Rev. M 8/2020

Section 3. Installation Instructions

COMBUSTION AIR SUPPLY

For indoor installation, the heater location must provide sufcient air supply for proper combustion and ventilation of

the surrounding area.

The minimum requirements for the air supply specify that the room in which a heater is installed should be provided with two permanent air supply openings; one within 12 inches (30 cm) of the ceiling, the other within 12 inches (30 cm) of the oor for combustion air, in accordance with the latest edition of ANSI Z223.1, or the National Fuel Gas code, the CSA B149.1, Natural Gas and Propane Installation Codes, as applicable, and any local codes that may apply. These

openings shall directly, or through duct, connect to outdoor air.

Note: For indoor installations where combustion air might be insufcient, see “Direct Air Intake Duct with 3-inch PVC Pipe (Indoor Installation)” below.

Air Supply Requirements Guide for MasterTemp Heaters

Minimum Net Free Open Area for Each Opening*

(Square Inches/Centimeters)

All Air From Inside Building All Air From Outside Building

Model

Combustion Vent Combustion Vent

175

200

250

300

400

200 sq. in. 1290 sq. cm.

250 sq. in. 1613 sq. cm.

300 sq. in. 1935 sq. cm.

400 sq. in. 2580 sq. cm.

200 sq. in. 1290 sq. cm.

250 sq. in. 1613 sq. cm.

300 sq. in. 1935 sq. cm.

400 sq. in. 2580 sq. cm.

50 sq. in. 323 sq. cm.

63 sq. in. 406 sq. cm.

75 sq. in. 484 sq. cm.

100 sq. in. 645 sq. cm.

50 sq. in. 323 sq. cm.

63 sq. in. 406 sq. cm.

75 sq. in. 484 sq. cm.

100 sq. in. 645 sq. cm.

* Area indicated is for one of two openings; one at ﬂoor level and one at the ceiling.

Table 4.

Direct Air Intake Duct with 3-inch PVC Pipe (Indoor Installation)

For indoor heater installations where combustion air supply might be insufcient, the MasterTemp® Heater is certied for a direct air intake duct using 3-inch PVC pipe. If outside air is drawn through 3” PVC duct directly into the heater, PVC pipe can be installed in accordance with the following requirements:

The air intake opening MUST be installed at least 1 ft. above the roof line or normal snow levels for free air ow. The Category I or III exhaust vent termination cap must have at least 3 ft. minimum vertical clearance from air intake duct.

(See diagram on page 24, and table 5).

Rev. M 8/2020 MASTERTEMP Pool and Spa Heater Installation and User’s Guide

36” (1 M) MIN.

12” (30 CM) MIN.

6” (15 CM) MIN.

12” (30 CM) MIN.

3” (80 MM) PVC Pipe

Section 3. Installation Instructions

Combustion 3 in. PVC Pipe Inlet Air Intake Duct Requirements*

Combustion Air Intake 3 in. Pipe

(Vertical or Horizontal)

No. of 90° Elbows Maximum Length in Feet (M)

0 70 ft. (21.3 M) 1 58 ft. (17.7 M) 2 46 ft. (14.0 M) 3 34 ft. (10.4 M) 4 22 ft. ( 6.7 M)

Table 5.

WARNING!

DO NOT USE PVC PIPE FOR FLUE EXHAUST VENT. FLUE EXHAUST VENT TEMPERATURES CAN BE IN EXCESS OF 400° F. FLUE EXHAUST VENT MUST BE CATEGORY I or CATEGORY III METAL VENT.

Figure 15.

Note (*): Combustion Air Intake Duct Connection Kit (Part Number 461031) for all MasterTemp heater models can be purchased separately. See page 63 for parts list.

NOTE

Each 90-degree elbow reduces the maximum horizontal PVC air intake duct run by 12 feet and each 45-degree elbow in the PVC air intake duct run reduces the maximum run by 6 feet. See the Table 5 above for the maximum lengths using 90-degree elbows.

Corrosive Vapors and Possible Causes

Chlorinated swimming pools and spas

New construction and remodeling areas.

Beauty parlors Permanent wave solutions, bleaches, aerosol cans containing chlorocarbons or ﬂuorocarbons.

Refrigeration plants or various industrial ﬁnishing and processing plants

Dry cleaning and laundry areas

Area Likely Contaminants

Pool or spa cleaning chemicals. Acids, such as hydrochloric or muriatic acid.

Glues and cements, construction adhesives, paints, varnishes, and paint and varnish strippers. Waxes and cleaners containing calcium or sodium chloride.

Refrigerants, acids, glues and cements, construction adhesives.

Bleaches, detergents, or laundry soaps containing chlorine. Waxes and cleaners containing chlorine, calcium or sodium chloride.

Table 6.

CAUTION

Chemicals should not be stored near the heater installation. Combustion air can be contaminated by corrosive chemical fumes which can void the warranty.

MASTERTEMP Pool and Spa Heater Installation and User’s Guide Rev. M 8/2020

Com

ustio

hambe

Flue Collar

4" x 8" Metal Flue Collar

ent Bod

lean the Interior Surface

Vent Pipe

lean and RTV

This Surface

Section 3. Installation Instructions

VENT INSTALLATION – INDOOR INSTALLATION (US AND CANADA)

(Category I)

Always vent the heater to the outdoors, see Note*.

NOTE *: Vent must be at least eight (8) feet away from nearest vertical surface. Vents extending ﬁve (5) feet or more above the roof must be braced or guyed. Consult your local code ofﬁcials for detailed information.

• Vent it vertically using Type “B” double wall vent connector pipe.

Locate the heater so as to minimize the length of horizontal venting and the number of vent elbows required. Horizontal vent runs must slope up 1/4-in per foot (2cm/M) from the heater to allow exhaust condensate to drain and it is recommended

to have a condensate drain as described in the venting installation instructions.

VERTICAL VENTING - NEGATIVE PRESSURE

(See Figures 16, 17 and 18)

Vent the heater vertically in a negative pressure (positive draft) system in accordance with the National Fuel Gas Code, ANSI Z223.1/NFPA 54 and/or CSA B149.1, Natural Gas and Propane Installation Codes, and local codes. Type “B” Double-wall vent connector is recommended; however single-wall pipe is allowed by the National Fuel Gas Code in some circumstances. Consult your local code ofcial for detailed information. Donotuse a draft hood with this heater.

To connect a negative pressure metal gas vent to the heater, order the appropriate Metal Flue Collar from the chart below:

Metal Flue Collar Part No.

4 x 6” 77707-0076

4 x 8” 77707-0077

Table 6.

1. See Table 7, on page 26 to determine allowable vent sizes for your heater.

Figure 16.

NOTICE: Table 7 is for installations in which the total lateral vent length (that is, the horizontal distance from the

ue collar to the main vertical portion of the vent) is less than 1/2 the total vent height (the vertical distance from the ue collar to the vent termination) and which have three or less elbows in the system. For venting systems which do not meet these conditions, consult the National Fuel Gas Code, ANSI Z223.1 (U.S.), or the standards CSA B149.1 and B149.2 (Canada).

Rev. M 8/2020 MASTERTEMP Pool and Spa Heater Installation and User’s Guide

Section 3. Installation Instructions

Read “VERTICAL VENTING – NEGATIVE PRESSURE” before using this table.

Table 7. – Permitted Minimum and Maximum Vent Heights By Size and Heater Model

Type “B” Double-Wall Vent with Type “B” Double-Wall Connector in Feet (Meters)

Vent Size

6 in. 6 ft. (1.8) /100 ft. (30.5) 6 ft. (1.8) /100 ft. (30.5) 18 ft. (5.5) /100 ft. (30.5) 30 ft. (9) /100 ft. (30.5) Not Rec.

7 in. 6 ft. (1.8) /100 ft. (30.5) 6 ft. (1.8) /100 ft. (30.5) 8 ft. (2.4) /100 ft. (30.5) 10 ft. (3) /100 ft. (30.5)

8 in. 6 ft. (1.8) /100 ft. (30.5) 6 ft. (1.8) /100 ft. (30.5) 6 ft. (1.8) /100 ft. (30.5)

9 and 10

in.

Model 175

Height min./max.

6 ft. (1.8) /50 ft. (15.3) 6 ft. (1.8) /50 ft. (15.3) 6 ft. (1.8) /50 ft. (15.3)

Model 200

Height min./max.

Model 250

Height min./max.

Model 300

Height min./max.

6 ft. (1.8) /100 ft.

(30.5)

6 ft. (1.8) /100 ft.

(30.5)

Model 400

Height min./

max.

15 ft. (4.6) /100 ft.

(30.5)

8 ft. (2.4) /100 ft.

(30.5)

6 ft. (1.8) /100 ft.

(30.5)

Type “B” Double-Wall Vent with Single-Wall Connector in Feet (Meters)

Vent Size

6 in. 6 ft. (1.8) /15 ft. (4.6) 6 ft. (1.8) /15 ft. (4.6) 6 ft. (1.8) /15 ft. (4.6) Not Rec. Not Rec.

7 in. 6 ft. (1.8) /8 ft. (2.4) 6 ft. (1.8) /8 ft. (2.4) 6 ft. (1.8) /8 ft. (2.4) 10 ft. (3) /20 ft. (6)

Model 175

Height min./max.

Model 200

Height min./max.

Model 250

Height min./max.

Model 300

Height min./max.

Model 400

Height min./

max.

15 ft. (4.6) /50 ft.

(15.3)

8 in. Not Rec. Not Rec. Not Rec. 6 ft. (1.8) /20 ft. (6)

9 in. Not Rec. Not Rec. Not Rec. Not Rec.

10 in. Not Rec. Not Rec. Not Rec. Not Rec.

8 ft. (2.4) /20

ft. (6)

6 ft. (1.8) /6 ft.

(1.8)

Not Rec.

NOTE

The allowable vent runs for each vent pipe diameter are different and can not be exceeded.

Each 90-degree elbow reduces the maximum horizontal vent run by 12 feet and each 45-degree elbow in the vent run reduces the maximum vent run by 6 feet. See Table 5 on page 24 for the maximum vent lengths using 90-degree and 45-degree elbows.

MASTERTEMP Pool and Spa Heater Installation and User’s Guide Rev. M 8/2020

2. Install the metal Flue Collar in the Vent Body of the

6" Minimum Clearance to Combustible

Materials

Listed Termination Cap

Storm Collar

Flashing

Firestop

Vent

Body

Metal Flue

Collar

Class B Double Wall

Metal Vent Pipe

Min. 10 Ft.

Support Vertical Vent Pipe so adapter does not take weight of pipe.

6" (15 cm) Minimum Clearance to Combustible Materials

Approved Te rmination Cap

Storm Collar

Flashing

Firestop

Vent

Body

Metal Flue

Collar

Double Wall

Metal Vent Pipe

Min. 10 Ft. (3.3 M)

Support Vertical Vent Pipe so adapter does not take weight of pipe. Dispose of condensate according to local codes.

Double Wall

Metal Vent Tee

Condensate Drain w/trap

Min. 2 Ft.

(.7 M)

heater (located under the outside vent cover). Fasten the metal Flue Collar to the Vent Body with two #10 sheet metal screws. Use high temperature silicone RTV to seal the Flue Collar to the Vent Body. Before connecting the metal Flue Collar to the Vent Body, wet a clean cloth or

paper towel with isopropyl alcohol (rubbing alcohol)

and vigorously wipe the socket of the Vent Body.

Immediately wipe the cleaned surfaces dry with a clean

cloth or paper towel. Repeat for the exterior of the 4” end of the metal Flue Collar. Attach the metal Flue Collar to the Vent Body using the RTV supplied with the kit,

following the vent manufacturer’s instructions (included with kit).

3. Attach the vent pipe to the metal Flue Collar with sheet-metal screws.

Section 3. Installation Instructions

Continue to next page.

WARNING

Risk of ﬁre or asphyxiation if vent is not assembled according to manufacturer’s instructions or if vent parts from different manufacturers are mixed. Vent parts from different manufacturers ARE NOT interchangeable. Mixing parts from more than one manufacturer may cause leaks or damage to vent. When assembling a vent, pick one manufacturer and be sure that all vent parts come from that manufacturer and are speciﬁed by the manufacturer for your system. Follow manufacturer’s instructions, local code requirements, National Fuel Gas Code requirements (U.S.) or standards CSA B149.1 and B149.2 (Canada) carefully d ing assembly and installation.

Figure 17. – Typical Metal Vent Pipe Installation - U.S.

(Vertical – Negative Pressure)

Rev. M 8/2020 MASTERTEMP Pool and Spa Heater Installation and User’s Guide

Figure 18. – Typical Metal Vent Pipe Installation -

Canada (Vertical – Negative Pressure)

Section 3. Installation Instructions

4. Install vent pipe so that it can expand and contract freely as the temperature changes. Support the vent pipe

according to applicable codes and the vent manufacturer’s instructions. Pipe support must allow the vent pipe free movement out and back, from side to side, or up and down as necessary, without putting a strain on the heater

or vent body. Slope horizontal pipe runs up from the heater at least 1/4” per foot (2cm per meter). Install Listed

condensate drains at low points where condensate might collect. Plumb condensate drains to a drain through hard piping or high temperature tubing such as silicone rubber or EPDM rubber – DONOTUSEVINYLOR

OTHERLOWTEMPERATURETUBING.FOLLOWDRAINMANUFACTURER’SINSTALLATION INSTRUCTIONS.

5. Use Listed re stop for oor and ceiling penetrations. Use Listed thimble for wall penetrations. Use a Listed roof ashing, roof jack, or roof thimble for all roof penetrations. Do not ll the space around the vent (that is, the clear air space in the thimble or re stop) with insulation. The roof opening must be located so that the vent is vertical.

6. Do not run the heater vent into a common vent with any other appliance.

Fire Hazard. Do not vent the heater directly into a masonry chimney. Installation into a masonry chimneymust use a chimney liner and must meet the National Fuel Gas Code, ANSI Z223.1/NFPA 54 and/or CSA B149.1, Natural Gas and Propane Installation Codes requirements and all local code requirements.

Risk of ﬁre, carbon monoxide poisoning, or asphyxiation. It is recommended to use a CO Monitor and Fire Alarm in

WARNING

MASTERTEMP Pool and Spa Heater Installation and User’s Guide Rev. M 8/2020

Section 3. Installation Instructions

HORIZONTAL OR VERTICAL VENTING - POSITIVE PRESSURE (See Figures 19, 20, & 21)

(Category III)

Vent the heater either horizontally or vertically using an optional vent adapter of the 4-inch special gas approved Category III vent pipes. Install the vent pipe in accordance with local codes and the provisions of the National Fuel Gas Code, ANSI Z223.1 (U.S.), or the standards CSA B149.1, Natural Gas and Propane Installation Codes (Canada), and the vent

manufacturer’s instructions. Do not use a draft hood with this heater. Install the vent according to the vent manufacturer’s detailed instructions. Note:Maintain clearance between the vent pipe and combustible surfaces according to the vent

manufacturer’s instructions and code requirements. Do not place any insulating materials around the vent or inside the required clear air space surrounding the vent. See Table 11 for maximum permissible vent lengths.

NOTE

The allowable vent runs for each vent pipe diameter are different and can not be exceeded. Each 90° elbow reduces the maximum horizontal vent run by 12 feet and each 45-degree elbow in the vent run reduces the maximum

vent run by 6 ft. See the Table 8 below for the maximum vent lengths using 90° elbows.

The MasterTemp heater is a “Category III” appliance (which requiresafour(4)inchspecialgasapproved“CategoryIII” ventpipe) and is a forced-draft pool and spa heater which uses

positive pressure to push ue gases through the vent pipe to the

outside. Flue gases under positive pressure may escape into the dwelling with any cracks or loose joints in the vent pipe, or improper vent installation. The vent pipe must be of a sealed-

seam construction, such as those listed for use with “Category III Appliances”, and for operating temperatures less than 400°F (204°C). Vent pipe construction will be of UL 1738 approved non-corrosive material, such as stainless steel. A condensate trap may be needed. The use of “Approved” thimbles, roof jacks and/or side vent terminals are required; and the proper

clearances to combustible materials must be maintained in accordance with type of vent pipe employed—in the absence of a clearance recommendation by the vent pipe manufacturer,

the requirements of the Uniform Mechanical Code should be

met. See page 21, for heater ventilation air requirements. It is recommended that vent runs over 18 feet may need to be insulated to

reduce condensation related problems and/or the use of a condensate

trap in the vent run close to the heater may be necessary in certain

installations such as cold climates. Horizontal vents 3’ (1M) or less in length do not require a condensate tee. The MasterTemp heater is suitable for through-the-wall venting.

Table 8.

4 in. Special Gas Vent (Vertical or Horizotal)*

No. of 90° Elbows Maximum Length in Feet (M)

0 70 ft. (21.3M)

1 58 ft. (17.7M)

2 46 ft. (14.0M)

3 34 ft. (10.4M)

4 22 ft. (6.7M)

*Minimum vent length is one foot (.34M), or in accordance with vent manufacturer’s instruction, and local and national codes. Horizontal vents 3’(1M) or less in length do not require a condensate tee, but must slope down toward the outlet at 1/4” to the foot (2cm/M) to allow condensate to drain.

CAUTION

Do NOT combine exhaust vent pipes to a common exhaust vent in multiple unit installations. Run separate vent pipes.

CONNECTING SPECIAL METALIC GAS VENT TO THE HEATER

1. ORDERANOPTIONALAPPLIANCEADAPTERKIT:(Pentairoffersoptionalapplianceadapterkits,

callCustomerServiceat(800)831-7133formoreinformation):PartNo.77707-0086forSaf-TVent®or Saf-TVent®CI.PartNo.77707-0087forZ-Vent.

2. Remove the outside vent cover. Install the Appliance Adapter in the Vent Body of the heater (located under the outside Vent Cover). Before connecting the Appliance Adapter to the Vent Body, wet a clean cloth or paper towel with isopropyl alcohol (rubbing alcohol) and vigorously wipe the socket of the Vent Body. Immediately wipe the cleaned surfaces dry with a clean cloth or paper towel. Repeat for the exterior of the heater end of the Appliance Adapter. Attach the appliance adapter to the vent body using the adhesive specied by the vent manufacturer,

following the vent manufacturer’s instructions.

Rev. M 8/2020 MASTERTEMP Pool and Spa Heater Installation and User’s Guide

Outlet Air Opening

Inlet Air Opening

Chimney or Gas Vent

Vent Cap and Riser Furnished by Installer

Side

Wall Vent

Heater

Chimney or Gas Vent

Vent Cap and Riser Furnished by Installer

Side

Wall Vent

Heater

Outlet Air Opening

Inlet Air Opening

Risk of carbon monoxide poisoning if adapter is improperly attached. Mechanical connections (such as screws) can cause cracking and leaks in the adapter. DO NOT drill holes or use screws to connect the appliance adapter to the heater vent body. Attach with manufacturer’s speciﬁed adhesive.

more than one manufacturer may cause leaks or damage to vent. When installing a vent, pick one manufacturer and be sure that all vent parts come from that manufacturer and are speciﬁed by the manufacturer for your system. Follow manufacturer’s instructions and local and National Fuel Gas Code (U.S.) or CSA B149.1, Natural Gas and Propane Installation Codes (Canada) requirements carefully during assembly and installation.

4. Install vent pipe so that it can expand and contract freely as

Section 3. Installation Instructions

WARNING

the temperature changes. Support the vent pipe according to applicable codes and vent manufacturer’s instructions. Pipe support must allow the vent pipe free movement out and back, from side to side, or up and down as necessary, without putting a strain on the heater or vent body. It is

recommended to slope the horizontal pipe runs up from the heater at least 1/4” per foot (2cm/M). Install “Approved”

condensate drains at low points where condensate might collect. Plumb condensate drains to a drain through hard

piping or high-temperature tubing such as silicone rubber or

EPDM rubber – do not use vinyl or other low temperature

tubing. Follow drain manufacturer’s installation instructions.

5. Use an “Approved” restop for oor and ceiling penetrations.

6. VentTermination–Vertical (SeeFigures19and20), for

7. Make sure entire installation is sealed according to approved

Continue on next page.

Use an “Approved” thimble for wall penetrations. Use an “Approved” roof ashing, roof jack, or roof thimble for all roof penetrations. Do not ll the space around the vent (that is, the clear air space in the thimble or restop) with

insulation. The roof opening must be located so that the vent is vertical.

height of vent termination above the roof. Use an “Approved” vent terminal specied by local and national codes and

your manufacturer’s instructions. A roof termination must

be vertical. In Canada, the Vent Cap location shall have a minimum clearance of 4 feet (1.2M) horizontally from

electric meters, gas meters, regulators, and relief openings.

standard.

Figure 19/20.

MASTERTEMP Pool and Spa Heater Installation and User’s Guide Rev. M 8/2020

1' Min.

4' Min.

3' Minimum clearance if horizontal distance to exhaust opening is less than 10 feet.

Forced Air Inlet

Vent Te rminatio

1' Minimum above snow or finished grade (whichever is higher)

At least 7' above grade adjacent to public walkways

Vent Te rmination

Vent Te rminatio

Gas Meter

Max. 12" Min. 3"

3" (7.6 cm) Min., 12" (30.5 cm) Max. Clearanc

Condensate drain w/Trap

Condensate Te e

Support weight of pipe

Listed Te rmina

Metal Special Gas Vent requires Appliance Adapter

Metal Vent Body

Slope at least 1/4" per foot (2 cm per Meter) down towards condensate drain

(Optional)

Section 3. Installation Instructions

8. VentTermination–Horizontal

Figure 21.

The terminal must be located (U.S. – See Figure21):

• at least 3” and at most 12” out from the wall (seeFigure22), following the vent manufacturer’s instructions

• at least 12” above nished grade or the normally expected snow accumulation level, whichever is higher

• at least 4 feet below or horizontally from, or 1 foot above, any doors or windows or gravity air inlet to a building

• at least 3 feet above any forced air inlet located within 10 feet

• at least 4 feet horizontally from electric meters, gas meters, regulators and relief equipment

• at least 7 feet above grade adjacent to walkways or similar trafc areas

The terminal must be located (Canada – SeeFigure21):

• at least 10 feet (3.3M) from any opening into a building

• at least 12” (.3M) above nished grade or the normally expected snow accumulation level, whichever is higher

• at least 4 feet (1.2M) horizontally from electric meters, gas meters, regulators and relief equipment

• at least 7 feet (2.1M) above grade adjacent to walkways or similar trafc areas

Allowatleastthreefeet(1M)verticalclearanceovervent terminationwhenterminatingunderanoverhang.

Avoid corners or alcoves where snow or wind could have

an effect. Exhaust may affect shrubbery and some building materials. Keep shrubbery away from termination.

To prevent staining or deterioration, sealing or shielding

exposed surfaces may be required.

WARNING

Fire Hazard. Do not run the heater vent into a common vent with any other appliance. Do not run the Special Gas Vent into, through, or within any active vent such as a factory built or masonry chimney.

Rev. M 8/2020 MASTERTEMP Pool and Spa Heater Installation and User’s Guide

Figure 22.

Leave 6 in. (15 cm) of clear space between heater and combustible surface.

Leave 3 ft. (1 m) or more of clearance above heater

RAISE AT LEAST 18 in. (46 cm) above floor

to avoid flammable vapors

18 in.

Section 3. Installation Instructions

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. Exhaust venting to the outdoors is required for all outdoor shelter installations.

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 Liqueﬁed Petroleum Gases, CAN/CSA B149.2 (latest edition) or ANSI/NFPA 58 (latest edition). Consult local codes and ﬁre protection authorities about speciﬁc installation restrictions.

The heater is design certied by CSA International for installation on combustible ooring; in alcoves; basements; in closet or utility rooms (in the U.S.).

GARAGE OR UTILITY ROOM INSTALLATION

In Canada, the heater must be installed in a room that is not normally occupied and has no openings directly to occupied areas.

WARNING

Risk of ﬁre and explosion if installed at ﬂoor level in an automotive garage or near gasoline or ﬂammable liquid storage.

Gasoline fumes are heavier than air and will settle to ﬂoor level in closed spaces. Gasoline fumes and spilled gasoline or other volatile liquids (such as some paints and varnishes) will travel across the ﬂoor and can be ignited by a gas appliance.

In any utility room or residential garage installation, install the heater with the base at least 18 inches (.5M) above the

oor, seeFigure23. In a garage, install a rail or wall to protect the heater from physical damage by a moving vehicle.

Provideanadequateventilationairsupply(SeeTable4,page23).Choosealocationthatwillavoidcontamination bychemicalfumes.

NOTICE:Combustion air contaminated by corrosive

chemical fumes can damage the heater and will void the warranty (SeeTable5,page24).

CAUTION

A Propane (LPG) ﬁred heater must not be installed ina garage in Massachusetts, by order of the Massachusetts State Fire Marshal. For more information, call the Massachusetts State Fire Marshal’s ofﬁce.

MASTERTEMP Pool and Spa Heater Installation and User’s Guide Rev. M 8/2020

Figure 23.

Door

Access

Panel

Top Panel

Door

Access Panel

Lead Anchor

For Heater mounting bolts and clamps, purchase separately Bolt Down Bracket Kit, Part No.

460738.

Section 3. Installation Instructions

CONTROL PANEL POSITIONING

On an outdoor shelter installation, the exhaust discharges into a vent pipe. Orient

the heater so that the vent pipe does not interfere with adjustment of the operating controls. The control panel located on the top panel can be rotated to any of the three sides of the heater for easy access, seeFigure24.

1. Remove the bolts from the door panels. Remove both door access panels.

2. Remove the four corner wing nuts that secure the top panel. Lift the top

panel upward to remove the top panel.

3. Rotate the top panel to the desired position located at 90° angles. Note that

the control panel must NOT be located on the side where the vent is located.

4. Replace the top panel down onto the side panels. Be sure that there are no

wires caught under the panel.

5. Secure the top panel using the four corner wing nuts.

6. Reattach the door access panels.

FINAL INSTALLATION CHECK

Figure 24.

Check that horizontal vent pipe runs slope uniformly at least 1/4” per foot (2cm per meter) to

condensate drain(s). No sags, no dips, no high or low spots. SeeFigure25.

Check that vent is supported at elbows, tees, and horizontal and vertical runs according to manufacturer’s instructions and code requirements.

Check that vent supports and wall and ceiling penetrations allow free movements up, down, and sideways without putting any strains on the heater or vent body.

Check for at least six inch (15cm) free air clearance between the heater vent pipe and

combustible materials.

Check that all joints are completely together and sealed.

In Florida, building codes require that the heater be anchored to the equipment pad or platform to withstand high wind pressures created during hurricanes. A Bolt Down Bracket Kit, P/N 460738, is available with anchor clamps designed to hold the unit to the equipment pad in high wind conditions. Installation of the anchor clamps are recommended in all installations and are required in Florida, (See Florida Building Code 301.13).

ELECTRICAL CONNECTIONS

Electrical Rating: 60 Hz 120 / 240 Volts AC, single phase: Enclose the incoming AC power line to the heater in

an approved exible conduit connected directly to the junction box on the inside of the access door panel. Line voltage eld wiring should be 14 gauge, with a circuit capacity of 15 Amps. Note: The heater operating AMP draw is

about 5 AMPS at 120 VAC and 2.5 AMPS at 240 VAC. A 15 AMP circuit capacity is required for the inrush current at startup. IMPORTANT NOTICE: FOR HEATER BONDING, see page 35

Figure 25.

CAUTION

This heater is designed to operate at 120 or 240 VAC. It is not recommended to be connected to OR operate on a 208 VAC.

Continue to next page.

Rev. M 8/2020 MASTERTEMP Pool and Spa Heater Installation and User’s Guide

AC Plug 120 Volt

240 Volt

Section 3. Installation Instructions

ELECTRICAL CONNECTIONS (CONTINUED)

NOTE

• Before making any electrical connections to the power supply, remove the access door panels, open the control box and plug in the correct plug (120 VAC or 240 VAC). See plugs below.

CAUTION

The heater ships from the Factory with the 240 VAC plug installed. Installing the 120V plug and then connecting the heater to 240V line current will immediately destroy the transformer, control board and ignition control module, and will void warranty. If you install the 240V plug and connect the heater to 120 VAC line current, the heater will not operate.

• If any of the original wiring supplied with this heater must be replaced, installer must supply (No. 18 AWG, 600V, 105° C. U.L. approved AWM low energy stranded) copper wire or it’s equivalent.

Pleasereadtheboxesheaded“IMPORTANT!READMEFIRST!”onpage42and49beforeproceeding.

1. All wiring must be in accordance with all applicable codes.

2. The heater, when installed, must be electrically grounded and bonded in accordance with local codes or, in the absence of local codes, with the National Electrical Code or the Canadian Electrical Code (as applicable). A bonding lug is provided on the outside of the panel under the vent for this purpose.

3. Electrical power circuits to the pool heater must follow local codes and National Electrical Code or Canadian Electrical Code (as applicable).

4. All wiring between the heater and devices not attached to it, or between separate devices which are installed in the

eld, must be “Type T” wire rated for 35°C rise.

5. All line voltage wiring shall be enclosed in approved exible conduit, and shall be securely attached to the eld wiring box located inside the access door panel. The conduit or cable connector at the eld wiring box should contain an insulating bushing or its equivalent to prevent abrasion of the wires as they enter the box.

6. Thelterpumpshouldruncontinuouslywhentheheaterison,andforatleast5minutesaftertheheaterturns

off.Any switches in the pump circuit (including circuit breakers) that can disconnect the pump must also disconnect the heater.

7. Do not wire single-pole switches, including protective devices, into a grounded line. The heater is not sensitive to

polarity.

Connect the L1 of the power supply to the black wire, the L2 or neutral lead to the red wire, and the ground wire to the green wire. A time

clock controlling the lter pump should have a low-voltage Fireman’s Switch that switches off

the heater at least 15 minutes before shutting off the pump.

Always use crimp type connectors when connecting two wires.

AC VOLTAGE SELECT PLUGS: (120 VAC or 240 VAC)

MASTERTEMP Pool and Spa Heater Installation and User’s Guide Rev. M 8/2020

Figure 26.

EXHAUST SIDE

ELECTRICAL CONDUIT PORT

HEATER BONDING

CONNECTOR

HEATER BONDING

WARNING

To reduce voltage gradients in the pool area, the

heater and the pool system equipment must be electrically grounded and “bonded” together. Connect a solid copper conductor (8 AWG or larger) to

the

heater “bonding” terminal lug provided on the ex-

haust side of the heater. SeeFigure27.

Not properly “bonding” and grounding the heater

increases the risk of electrical shock and can cause

damage and electrolysis to the heat exchanger.

All wiring must be in accordance with all applicable codes. The heater, when installed, must be

electrically grounded and “bonded” in accordance

with local codes or, in the absence of local codes, with the National Electrical Code or the Canadian Electrical Code (as applicable).

Section 3. Installation Instructions

Figure 27.

Rev. M 8/2020 MASTERTEMP Pool and Spa Heater Installation and User’s Guide

GND

GROUND (GND )

JUNCTION

BOX

TRANS

I R E M A N S

S W

I T C H

Fireman's Switch Completes the heater 24 Volt AC Control Board Circuit. DO NOT connect this circuit to Line Voltage!

TERMINAL BOARD

TRANS

FUSE

Time Clock or Remote

(Purchase Separately –

Supplies Power to

Circulator Pump)

24VA C

12 Pin

Receptacle

VAL

IND

GND

24VAC

THERMISTOR

OPERATING CONTROL

DISABLE TOGGLE

ENABLE TOGGL

MEMBRANE PAD

CONNECTION

Section 3. Installation Instructions

REMOTE CONTROL CONNECTIONS

1. Switch off power to heater at main circuit breaker panel.

2. Unbolt and remove the access door panels.

3. Open control box cover (see Figure 28).

4a. Toconnecta2-WireControl(suchasIntelliTouch

Systems)oratimer:

- Remove the factory installed jumper from the Fireman’s Switch terminals.

- Connect wires between the Fireman’s Switch terminals on the heater and the relay. Connect wires from the controller or timer to the Fireman’s Switch. Controller, timer or relay should be sized to handle 24VAC at

0.5 Amp (because it will be completing the 24VAC control board circuit on the heater as shown in Figure 28). DO NOT apply line voltage to the Fireman’s Switch terminals. Use 18 gauge wire with a minimum 3/64” (1.2mm) thick insulation rated for a temperature rise of at least 105°C.

- Knock-outs are provided to route the wires through the bottom of the control box and past the junction box.

4b. Toconnecta3-WireControl:

- Connect wires between the control board terminals on the heater and the external relays, as shown in

Figure34. Use at least 2 relays per heater, to allow

for an “OFF setting” on each heater mode. Select relays that can handle logic level switching. DO NOT

apply line voltage to control board terminals.

- Move jumper(as shown on Figure 34) to

enable externalcontrol andto disable the heatermembrane pad’s“Pool /Spa button (the “HEATER OFF”)button on thecontrol panel

- Knock-outs are provided to route the wires through

5. Close control box cover.

remainsfunctional).

the bottom and the top of the control box and past the junction box.

orEasyTouch®Control

Figure 28.

6. Re-install the access door panels.

To control heaters that are operated in parallel, connect wiring

at same locations on heater as 2-Wire or 3-Wire Control. It

is imperative that each control circuit is isolated from the

other control circuits, to avoid that current will ow from

one heater to another through the control circuits.

NOTICE:The fuse for the Fireman’s Switch is a 1.25 Amp 1¼ x ¼” fast blow fuse.

MASTERTEMP Pool and Spa Heater Installation and User’s Guide Rev. M 8/2020

Figure 29.

Water Pressure Switch

Section 3. Installation Instructions

Connecting the MasterTemp® Heater to the IntelliCenter™ Control System Load Center via RS-485

For remote control and monitoring, the MasterTemp heater can be connected via the heater’s RS-485 COM port to the IntelliCenter Control System COM port. The heater can be wired to the IntelliCenter Control System via a RS-485

connection. Up to 16 heaters can be connected. The default address of a heater is 1. If additional heaters are connected, each heater must have its own address. The address range is 1 to 16. The address for each heater is set from the heater’s front LCD panel menus.

When a heater is being controlled via the RS-485 interface: • The heater front panel buttons are inactive. Press a panel button to turn on the LCD display. “RS485 Control” is displayed. • Heater Alarms/Errors are displayed on

IntelliCenter’s control panel(s) Status Home screen.

Accessing the MasterTemp® Heater RS-485 COM Port

To access the MasterTemp heater control panel RS-485 COM port terminal, the RS-485 cable must be routed through

the hole in the heater’s side panel.

To route the RS-485 cable through the heater’s panel to the control panel circuit board:

1. Remove the four corner wing nuts that secure the top panel. Lift the top panel upward to remove the top panel. Note: If

needed, remove the wires from the control board if the top is removed completely. SeeFigure31.

2. Locate the small hole in the exhaust panel, for the RS-485 cable. Use an appropriate size drill bit for the exible conduit or strain relief to be used in the exhaust panel to drill a hole for the RS-485 wires. SeeFigure32.

3. Install a exible conduit or a strain relief and securely attach to the heater panel. Note: The conduit or cable connector

should contain an insulating bushing or its equivalent to prevent abrasion of the RS 485 wires as it enters the exhaust panel.

4. Strip back the outer jacket four inches of the cable. Strip back each conductor ¼-inch.

5. Insert the RS-485 cable (from the Load Center or Power Center) through the exible conduit or a strain relief into the exhaust panel hole and securely attach to the heater panel.

6. Once the cable is inside the heater, route the RS-485wires under exhaust. Note:Donotletthewirescontactthe

exhaust.

7. Using cable ties, secure to the RS-485 cable to the main wire harness that connects to heater’s control panel circuit

board.

8. Insert the three RS-485 wires (Pin 1-BLACK, 2-GRN, 3-YEL) into the screw terminal. Secure the conductors with the screws. For wiring details, refer to the pin conguration on next page.

9. HeaterControlPanelCOMPort(J4): Insert the RS-485 connector onto the heater’s control panel RS-485 COM Port

screw terminal. NotePin1islocatedontheleftsideoftheterminalconnector.

10. Replace the top panel onto the heater side panels. Be sure that there are no wires caught under the panel. Secure the top

panel using the four corner wing nuts.

11. Continue with“ConnectingtheRS-485CablefromtheHeatertotheLoadCenter”onnextpaage.

Drill an appropriate size hole

for the ﬂexible conduit or

strain relief to be used.

to secure the

RS-485 wires.

Figure 32.

Figure 31.

Rev. M 8/2020 MASTERTEMP Pool and Spa Heater Installation and User’s Guide

MasterTemp Heater (Exhaust Side)

Section 3. Installation Instructions

Connecting the RS-485 Cable from the Heater to the Load Center

To connect the MasterTemp heater to the load center:

BEFORE REMOVING THE HIGH VOLTAGE COVER PANEL FROM THE

LOAD CENTER OR POWER CENTER ENCLOSURE SWITCH OFF THE POWER AT THE HOUSE MAIN CIRCUIT BREAKER BOX.

1. Switch OFF AC power to the enclosure at the main house panel circuit breaker.

2. Unlatch the front door latch and open the front door. Remove the two retaining screws from the High Voltage Cover

Panel and remove the panel. SeeFigure30.

3. Loosen the two retaining screws securing from the top edge of the Outdoor Control Panel. Fold down the Outdoor

Control Panel to access the circuit board sockets connectors for the electrical connections.

Loosen Outdoor Control Panel

Retaining screws

Flip down the Outdoor Control Panel to ac-

Circuit board and low voltage compartment

Front door

Figure 30.

LOW VOLTAGE RACEWAY

HiHigh Voltage Cover Panel slots (3)

HigHighHigh Voltage Cover Panel Tabs (3)

Note: Use a 22 AWG four conductor low voltage RS-485 cable to connect to the MasterTemp heater to the IntelliCenter Control System Load Center:

4. Run the RS-485 cable from the heater’s control board RS-485 COM port terminal connector to the Load Center or Power Center. See wiring connection Figure33 on next page.

5. Insert the cable into the one of the plastic grommet ttings, located on the lower left side of the enclosure and pull the

cable up through the low voltage to the circuit board, as shown below.

6. Strip back the outer jacket four inches. Strip back each conductor ¼-inch.

7. IntelliCenterControlSystemCOMPort(J4orJ5): Insert the conductors into the COM Port screw terminals located

on the top of the IntelliCenter Control System circuit board (see diagram below). Secure the conductors with the screws.

For wiring details, refer to the pin conguration shown below. Note: Multiple conductors may be inserted into a single

screw terminal.

MASTERTEMP Pool and Spa Heater Installation and User’s Guide Rev. M 8/2020

Section 3. Installation Instructions

14 VDC, 2.0A Max. Combined.

Connecting IntelliFlo® Pump to IntelliCenter™ Control System COM PORT: Strip 1/4” insulation from the green and yellow wire conductors.

• Connect the Green wire to pin 2 on Connector J4 or J5.

• Connect the Yellow wire to pin 3 on Connector J4 or J5. Note: Multiple wires may be inserted into a single terminal.

Optional: COM PORT expansion module (P/N 520818) with 3 extra COM PORTS up to 2 modules can be installed.

Note: COM PORT A& B 14 VDC, 2.0A Max. Combined

4 3 2 1

+15 +DT -DT GND

TO HEATER

CONTROL PANEL

RS-485 COM PORT

Connecting the RS-485 Cable from the Heater to the Load Center (Continued)

To heater Control Panel RS-485 COM port screw terminal

Figure 33.

MasterTemp COM Pport

Control Panel

Screw Terminal

1 2 3 4

Heater to IntelliCenter wires pin assignment

MasterTemp Heater

COM Port

screw terminal

IntelliCenter Control System

COM Port (J4 or J5)

connector

NOT USED NOT USED

3 (YELLOW) 3 (YELLOW)

2 (GREEN) 2 (GREEN)

1 (BLACK) 1 (BLACK)

8. Reinstall the High Voltage Panel: Insert the panel’s three tabs into the lower slots on the enclosure.

9. Secure the panel with the two (2) retaining screws. Close the front door and secure with the latch. See Figure 30 on

page 38.

10. SWITCHONACpower to the IntelliCenter Control System Load Center.

Rev. M 8/2020 MASTERTEMP Pool and Spa Heater Installation and User’s Guide

BR BR

VAL

IND

24VAC

BYPASS VALVE

JMP1

ES1

AFS

AGS

SFS

GRN

BLK

N/C

SPA LINE

COMMON LINE

POOL LINE

OPERATING CONTROL

GAS

GND

THERMISTOR

Plug –12 pin

120V – Black 240V – Red

CONNECTION DIAGRAM

AGS Switch

Stack Flue Sensor

Gas Valve

Air Flow Switch

Extra Switch 1

Hi-Limit Switch

Pressure Switch

Line 2

TRANS

Line 1

Ground

JUNCTION BOX

F I R E MA N S

S WI T C H

WR R

Y/W

Y Y Y

External Control Interface

NOTICE: Touching any 24VAC wire, including the Fireman's Switch wire, to any 120/240V terminal while the heater is connected to line power will immediately destroy the control board and void the warranty.

12 Position Receptacle

Y/R

Y/BL

Y/O

Y/W

Y YYY Y

GND

Replace jumper with

leads to Fireman"s

Switch (field installed)

GND

Y/BL

Y/W

24VAC

SEC

Y/R

Y/O

Y/W

IND

24VNCVAL

GND

FENWAL

IGNITION CONTROL

MODULE

S1/120

S1/240

DIAGNOSTIC CONNECTION

BLOWER

GND

Y/R

Y/BL

Y/O

Y/W

FC± DC

JMP1

DISABLE

3-WIRE

CONTROL

JMP1

External Control Interface Circuit Disabled, Heater Control Panel Enabled

When 3-Wire Control is enabled, the POOL/SPA button on the heater’s control panel is disabled

HLS

YEL

ENABLE

3-WIRE

CONTROL

120 VAC IGNITER

RS-485 Port

Section 3. Installation Instructions

MASTERTEMP HEATER WIRING DIAGRAM

(3-WIRE SYSTEM)

MASTERTEMP Pool and Spa Heater Installation and User’s Guide Rev. M 8/2020

Figure 34.

BYPASS VALVE

4.)

EXTERNAL VALVE THAT NEEDS TO BE INSTALLED.

Section 3. Installation Instructions

MASTERTEMP HEATER ELECTRICAL SCHEMATIC LADDER DIAGRAM

Rev. M 8/2020 MASTERTEMP Pool and Spa Heater Installation and User’s Guide

Figure 35.

Section 3. Installation Instructions

Operation Instructions

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 lled with water. Follow the Lighting/Operating instructions below.

MASTERTEMP HEATER HSI ELECTRONIC IGNITION LIGHTING/OPERATION

FOR YOUR SAFETY: READ BEFORE LIGHTING

WARNING

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.

START-UP AND OPERATION

START-UP AND SHUTDOWN INSTRUCTIONS ARE ON THE LABEL ATTACHED TO THE COVER OF THE APPLIANCE CONTROL BOX.

BEFORE START-UP

A. This appliance does not have a pilot. It is equipped

with an ignition device which automatically lights the burners. Do not try to light the burners by hand.

B. BEFOREOPERATING,smell all around the appliance

area for gas. Be sure to smell next to the oor because some gas is heavier than air and will settle on the oor.

WHAT TO DO IF YOU SMELL GAS

– Do not try to light any appliance.

– Do not touch any electrical switch; do not use any phone

in your building.

– Immediately call your gas supplier from a neighbor’s

phone. Follow the gas supplier’s instructions.

– If you cannot reach your gas supplier, call the Fire

Department.

C. Use only your hand to turn the gas control on or off.

Never use tools. If you cannot change the ON/OFF setting by hand, don’t try to repair it, call a qualied service technician. Forced or attempted repair may result in a re or explosion.

D. Do not use this heater if any part has been under water.

Immediately call a qualied service technician to inspect

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 lled with water.

F. Before operating the appliance for the rst time or

after it has been off for an extended time, perform the following checklist:

1. Remove debris or other articles from inside the heater

and the area around the heater and its exhaust vent.

Make sure the ventilation openings are clear of debris

or obstruction. For installations in an enclosed space,

make sure openings for combustion and ventilation air are unobstructed.

2. Keep heater area clear and free from combustibles, ammable liquids and chemicals.

3. Check that all water connections are tight.

4. Water must be owing through the heater during operation. Make sure that pool/spa is lled with water and have pump operating. Check that water ow is unobstructed from the appliance. When operating for the rst time or after an extended shut-down, run lter pump for several minutes to clear all air from

the system.

MASTERTEMP Pool and Spa Heater Installation and User’s Guide Rev. M 8/2020

YOU ARE HERE

Gas control is shown OFF. Push toggle switch away from you to switch ON.

Water Pressure Switch

Section 4. Operation Instructions

OPERATING INSTRUCTIONS

1. STOP! Read the safety information on (page42).

2. Set both pool and spa set points to the lowest settings.

3. Turn off all electric power to the appliance.

4. This appliance does not have a pilot. It is equipped with an ignition device

which automatically lights the burner. Do not try to light the burner by hand.

5. Remove the access door panels by unfastening the four screws located on each door, then lift up and out from the bottom of the panel to remove. If necessary, the screws may be used as handles, seeFigure36.

6. Toggle-StyleValve: Pull toggle toward you to turn gas off , seeFigure37.

7. Wait ve (5) minutes to clear out any gas. If you then smell gas, STOP! Follow “B” in the “Before Start-up” instructions (page42). If you don’t smell gas, go to the next step.

8. Push the toggle switch away from you to switch the gas on.

Figure 36.

9. Replace the Door Access Panels. All panels must be in place when operating

the heater.

10. Set 3-way valves on inlet and outlet to pool or spa, as appropriate.

11. Turn on all electric power to the appliance.

12. Toggle between Pool or Spa mode on the operating control.

13. Set the thermostat to desired setting (NOTICE: Setpoint must be above

actual water temperature or burner will not re). SeeCONTROLPANEL onpage46.

Figure 37.

14. The blower should come on immediately, and after about 20 seconds, the burner should re. When operating for the rst time, the burner may not re on the rst try because of air in the gas line. If it does not re at rst, push the OFF switch, wait ve minutes, and again push the POOL or SPA ON switch. The burner should re after about 20 seconds. You may have to repeat this until all of the air has cleared the gas line.

15. The burner should re 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.

16. If the appliance will not operate, follow the instructions below “TO TURN OFF GAS TO THE APPLIANCE”, and

call your service technician or gas supplier.

TO TURN OFF GAS TO APPLIANCE

1. Press the OFF button on operating control.

2. Switch off all electric power to the unit.

3. Remove the access door panels, seeFigure36.

4. Toggle-StyleValve: Pull toggle toward you to turn gas off, seeFigure37.

5. Replace the Access Door Panels.

Rev. M 8/2020 MASTERTEMP Pool and Spa Heater Installation and User’s Guide

Water Pressure Switch

Star Wheel

A reference scale is on the back of pressure switch

Tu rn star wheel clockwise to raise pressure set point if pressure switch is more than 4 feet (1.2M) below water level

Tu rn star wheel counterclockwise to lower pressure set point if pressure switch is more than 5 feet (1.5M) above water level

Section 3. Installation Instructions

SAFETY CONTROLS

AIR FLOW SWITCH (AFS)

The air ow switch, (seeFigure38), 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 ow switch is factory set and is connected

upstream of the ignition module. The ignition module does not operate unless the air pressure switch and all safety switches are closed.

WATER PRESSURE SWITCH

WARNING

Hazardous pressure. Do not bypass the Water Pressure Switch or render it inoperable.

The water pressure switch, (seeFigure38). If the water ow is restricted,

the water pressure switch may prevent the burner from ring and cause the “Service System” light to go on. If the light remains on after the lter has been serviced, have a qualied service technician check the system.

For deck-level heater installations, the Water Pressure Switch is factory set at

3.00 psi (20.6 kPa). NOTE:SEE,BELOWPOOLLEVELINSTALLATION

INSTRUCTIONSON PAGE 15. If the pressure switch is one feet (.3M)

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40. Test the switch after resetting.

NOTICE: When the heater is mounted more than ve feet (1.5M) above or four feet (1.2M) below the deck level, a Pressure Switch is no longer adequate. A Flow Switch must be installed instead.

NOTICE: Heater operation with incorrect Pressure Switch setting may cause operation

with no water ow. Operation of the heater

without sufficient water flow may severely damage it.

Air Flow Switch

Figure 38.

Figure 39.

HIGH LIMITS

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

heater series of heaters contains two (2) high limit devices which are located on the main inlet

/ outlet header.

MASTERTEMP Pool and Spa Heater Installation and User’s Guide Rev. M 8/2020

Figure 40.

Section 3. Installation Instructions

SAFETY CONTROLS, (cont’d.)

OPERATION OF IGNITION MODULE

The Ignition Module,(seeFigure41), is microprocessor based and operates on 24VAC supplied by the transformer. The

control utilizes a microprocessor to continually and safely monitor, analyze, and control the proper operation of the gas ame holder. The module with the presence of the ame sensor, using ame rectication, allows the heater to operate.

WARNING

RISK OF EXPLOSION OR FIRE CAUSING BURNS OR DEATH IF SAFETY INTERLOCKS ARE DISABLED. DO NOT attempt to operate

heater when The ERR HLS, ERR AFS, ERR IGN, ERR AGS, ERR SFS, E01, E05, E06, 126 messages on the LCD indicates a fault in the heater or its controls. If any of these messages are displayed, shut down the heater (See “TO TURN OFF GAS TO THE APPLIANCE” on page 43), and have a qualiﬁed service technician check the system.

Diagnostic errors are displayed on the control panel LCD: PS, HLS, SFS, AFS, AGS, IGN, or NONE. See Troubleshooting (pages 52-54)

Flame Current

Check Point

Diagnostic Indicator

(See table below)

Figure 41.

Table 7. Diagnostic Indicator

Displayed Message Description CONTROL FAULT Displays Message on Automation System AIR FLOW FAULT Displays Message on Automation System FLAME NO CALL FOR HEAT Displays Message on Automation System IGNITION LOCKOUT Displays Message on Automation System WEAK FLAME Displays Message on Automation System and viewed on Heater menu GOOD FLAME Displays Message on Automation System and viewed on Heater menu

ERROR PS MESSAGE

• The ERR PS message on the LCD indicates that there is insufcient water ow to the heater. If the pump is operating, this usually indicates that the lter and/or skimmers should be cleaned (some lters may require back-washing). If the message remains on after the lter/skimmers have been serviced, the system should be checked by a qualied service

technician.

Rev. M 8/2020 MASTERTEMP Pool and Spa Heater Installation and User’s Guide

Temperature

Controls Up/Down

LCD Temperature

Display

Menu/Back

Select

Buttons

Toggle

switch

displays

Heater/Off

Heater ON

Red LED Indicator

Pool/Spa

Toggle Button

Section 4. Operation Instructions

CONTROL PANEL

Control Panel Description

LCD Display: The LCD displays two lines of text.

During normal heater operation the current pool or spa water temperature is shown on line 1 of the display. The heater set point for the pool or spa is shown on line 2 of the display. The display will turn off after two (2) minutes

of inactivity on the keypad. When the display is off due

to inactivity, pressing any button will turn it back on.

POOL/SPA: Toggles between POOL and SPA mode:

Displays the selected pool or spa body of water actual temperature and set point.

HEATER OFF: Press this button to put the heater into

IDLE/OFF mode. The LCD will display HEATER OFF.

UP Arrow Button: Increase heater temperature set point. Scroll through menu items

and change settings.

Figure 42. Heater Control Panel

DOWN Arrow Button: Decrease heater temperature set point. Scroll through menu

items and change settings.

SELECT: Select current menu item or save menu item settings.

MENU/BACK: Enter menu items. Press Down to scroll through menu item. Press Menu/Back to return to main screen.

HEATING (LED): Solid Red LED on indicates the heater currently heating. LED Off: Heater is not active. Note: During

the heater ignition process, this LED blinks.

Menu Navigation

1. Press MENU/BACK displays POOL MAX. Use the DOWN or UP button to scroll through each of the highlighted

menu items.

2. Press SELECT to access the highlighted item. Press UP/DOWN to change or view the highlighted item.

3. Press SELECT to save, exit the setting and return to the menu items. Note: To exit the menu without saving and return to the main screen, press MENU/BACK two times.

Operating the Heater

e heater comes factory set at 78°F for the pool mode and 100°F for the spa mode. Using the up and down arrows, you can set the thermostats to a minimum temperature of 65° F., or a maximum of 104° F.

Heating the Pool or Spa (Press the HEATER OFF button to turn OFF the heater).

• Press POOL/SPA to select either Pool or Spa. The display shows the current set point and water temperature. Press Up/Down to increase or decrease water set point temperature. If the current water temperature is below the

Set point water temperature, the heater will begin heating.

MASTERTEMP Pool and Spa Heater Installation and User’s Guide Rev. M 8/2020

Section 4. Operation Instructions

POOLMAX(65°F-104°F): The maximum heater operating temperature for the pool.

SPAMAX(65°F-104°F): The maximum heater operating temperature for the spa.

UNITS:Select F (Fahrenheit) or C (Celsius) to display change the display of the heat settings. Select US or Metric units.

HISTORY: Use Up/Down button to scroll through the last ve heater errors.

CYCLES: Number of heater on/off cycles.

RUNTIME: Total number of hours the heater has spent heating the water.

SFSTEMP: Displays the current Stack Flue Sensor temperature.

FLAME: Displays the current ame sensor status (Normal or Low).

BACKLITE: Time-OutEnabled/Disabled:

 Time-OutEnabled:The LCD backlight will turn off after two minutes of no control panel key pad activity. After three

minutes of no key pad activity the LCD will turn off. When the LCD and/or the Backlight are off, any button press will turn the LCD and backlight back on. After that, the control panel buttons are in normal operating mode.

 Time-OutDisabled: The LCD and backlight will stay on continuously and will not timeout.

HTRADDR: Set the heater address (1-16) for automation control.

BP-VALVE(By-passValve):Enabled/Disabled

By-passValveDescription

e purpose of the automatic BPVALVE (bypass valve) feature is to by-pass the ow of water from the heater inlet to the heater outlet when the heater is not ring. ere is a minimal amount of water ow through the heater when the heater is not ring, and a maximum water ow through the heater when the heater is ring. For more information about Manual By-Pass and Automatic By-Pass valves, see page 14-15.

 By-PassEnabled

When the BYPASS VALVE feature is enabled and there is a call for heat, the by-pass valve closes to allow

water to ow through the heater. It takes 30 seconds for the bypass valve to rotate to the closed position. This allows the valve to complete rotation so there is sufcient water ow and pressure to prevent the water pressure switch from trigging an error. When the call for heat ends, the water ow continues through the heat exchanger for a cool down period of one minute. After the cool down period, the by-pass valve will rotate so that water no longer ows through

the heater.

 By-PassDisabled

When the BYPASS VALVE feature is disabled, there is no automatic switching of the by-pass valve when the heater

starts a heating cycle. The valve stays in the position and water always ows through the heater.

LANGUAGE: English, Spanish or French

VERSION: View the current heater rmware version.

Rev. M 8/2020 MASTERTEMP Pool and Spa Heater Installation and User’s Guide

Fault Condi�on

Error Code Displayed

Note

Troubleshoo�ng

Water pressure switch

ERR PS

If water ow is established the

operaon is resumed.

No water ow thru

Hi temperature limit

ERR HLS

When the temperature falls

resumed.

Water temperature aer

than 135°F.

Air ow switch open

ERR AFS

If adequate air ow through the

buon.

The blower is not on or

Ignion Control Module

ERR IGN

To clear the error the HEATER

The Ignion Control

ignite the heater.

Automac gas shuo

ERR AGS

The front panel buons will be

Water temperature aer

140°F

Excessive stack ue

ERR SFS

The front panel buons will be

cycle power.

The temperature of the

480°F

Open stack ue sensor

E05

Shorted stack 

E06

The front panel buons will be

cycle power.

Follow diagram on page Open water temperature sensor

E01

To clear the error the HEATER OFF buon must be pressed.

Follow diagram on page 53

Shorted water temperature sensor

126

Follow diagram on page 53

Section 5. Troubleshooting

Troubleshooting

Initial Troubleshooting

Only qualiﬁed, trained service technicians with appropriate test equipment should service the heater. Remember that all parts of the system affect heater operation. Before starting this troubleshooting procedure, make sure that the pump is running correctly, that there are no blockages in the system, that the valves are correctly set and that the time clock is correctly set and is running.

CAUTION: Installing the BLACK 120 VAC plug in the control box and then connecting the heater to a 240 VACt line will destroy the transformer, control broad, and ignition control module, and will void the warranty. If you install the RED 240 VAC plug and then connect the heater to a 120 VAC line, the heater will not operate. See page 34.

READ THE FOLLOWING INFORMATION CAREFULLY

1. Check the line voltage to your heater. This heater will operate on either 120 Volts AC or 240 Volts AC.

2. Remove the covers and check the 12-pin plug in the back of the control box. The plug must match the voltage in the heater circuit.

3. If the 12-pin plug is not plugged into the back of the control box, select the correct plug from the bag in the control box and plug it in. The BLACK plug is for 120 volts, the RED plug is for 240 volts.

Error and Fault Codes

Table 8. Heater Error and Fault Codes

open

switch open

the error is cleared and normal

below 135°F the error is cleared

and normal operaon is

blower is established within 60 seconds the heater will resume normal operaon. If the error is

not corrected within 60 seconds the heater will need to turned

o by pressing the HEATER OFF

OFF buon must be pressed.

disabled. To reset the heater,

cycle power.

heater

the 1st pass through the heater exchanger is more

air thru it is being restricted

Module was not able to

the 2nd pass thru the heat exchanger is more than

MASTERTEMP Pool and Spa Heater Installation and User’s Guide Rev. M 8/2020

temperature

sensor

disabled. To reset the heater,

stack ue is more than

Follow diagram on page 54

Troubleshooting

Initial Troubleshooting

Only qualified, trained service technicians with appropriate test equipment should service the heater. Remember that all parts of the system affect heater operation. Before starting this troubleshooting procedure, make sure that the pump is running correctly, that there are no blockages in the system, that the valves are correctly set and that the time clock is correctly set and is running.

IMPORTANT! READ ME FIRST!

NOTICE: Installing the black 120 volt plug in the control box and

then connecting the heater to a 240 volt line will destroy the trans former, control broad, and ignition control module, and will void the warranty. If you install the red 240 volt plug and then connect the

heater to a 120 volt line, the heater will not operate.

READ THE FOLLOWINGCAREFULLY:

1. Check the line voltage to your heater. This heater will operate

Start here for directions to specific Troubleshooting Chart

Section 5. Troubleshooting

on either 120 Volts AC or 240 Volts AC.

2. Remove the covers and check the 12-pin plug in the back of the control box. The plug must match the voltage in the heater circuit.

Is POOL OR SPA displayed on the LCD? See page 48.

YES

See ALARMS. Heater Error and Fault Codes, page 48.

Go to ALARMS in the menu tree of the control board. See page 52.

Turn off power to heater for about 5 seconds, and turn back on. Make sure temperature setting is above water temperature. Wait one minute.

Are any errors displayed on LCD?

YES

Verify that water temperature setting is above water temperature reading. If it is, and heater either will not fire or NO

ERRORS are displayed. Replace Controll Baord.

Are any ALARMS shown on LCD?

Is the "Heating" LED blinking?

YES

Go to chart “HEATER WILL NOT FIRE - A” (Page 50)

Go to chart “HEATER WILL NOT FIRE - B” (Page 51)

Go to specific safety switch troubleshooting chart (Pages 44 and 45)

Go to chart ‘HEATER WILL NOT FIRE -A and B (Page 50 and 51)

WARNING

Disconnect power before servicing any components.

Rev. M 8/2020 MASTERTEMP Pool and Spa Heater Installation and User’s Guide

Hazardous voltage. Can shock, burn or kill.

WARNING

switch terminals to remedy a failed safety switch.

Fire and Explosion hazard.

Do not jumper

Heater Will Not Fire - A

Start

GO TO “HEATER WILLNOT FIRE - B” Page 51.

Heater should fire on demand for heat.

Check Fireman’s Switch circuit connections (time clock, wiring, external controller relay).

Remove jumper. Check wiring between Transformer and J7 terminals on Control Board and between J7 and Fireman’s Switch on Terminal Board, check fuse, and restore continuity.

Restore power to heater.

Replace Transformer.

Heater should fire on demand for heat.

Replace Control Board.

Replace Membrane Pad.

Check wiring connections between power supply and Junction Box and between Junction Box and Terminal Board; restore continuity.

Check wiring connections between Terminal Board and Transformer primary and restore continuity.

Is POOL or SPA displayed on the LCD?

YES

Press Pool/Spa button on pad. Does POOL or SPA displays on LCD?

Check for linevoltage to heater.

Check for 24 VAC at secondary of Transformer. .

Check for Line Voltage at Transformer primary pins. White connects to Pin 3 on Transformer, Black to Pin 2, Orange to Pin 1.

240V: check Pin1 to Pin 3. 120V: check Pin 2 to Pin 3.

Jumper Fireman’s Switch at Terminal Board and depress

POOL/SPA On button on membrane pad. Does “SPA” or “POOL” display?.

Leaving jumper in place,

check for 24 VAC between

Fireman’s Switch terminals

and ground.

Jumper J6-6 and J6-3. Does mode toggle between POOL and SPA?

Check for Line Voltage

between L1 and L2 terminals

on Terminal Board.

YES

Check that correct 12-pin plug is installed (red is 240V, black is 120V)

If plug is not installed:

Install correct plug.

240V plug in 120V circuit: Replace with

correct plug.

120V plug in 240V circuit: Replace trans-

former, control board, and ignition control module (see “HEATER WILL NOT FIRE-B page 51. Check fuse and all other 24V components for damage.

Remove jumper. Check ribbon

cable connection between

Membrane Pad and J6 on

Control Board. Depress

POOL/SPA On button is on

again. Does “POOL” or “SPA”

display?

Section 5. Troubleshooting

MASTERTEMP Pool and Spa Heater Installation and User’s Guide Rev. M 8/2020

Heater Will Not Fire - B

Start

Service pump/filter and eliminate other flow obstructions.

Heater should fire on call for heat. Re-verify that water flow is above minimum requirement.

Minimum Flow Requirements

Model Flow

200 20 gal/min (76 LPM)

175 20 gal/min (76 LPM)

250 25 gal/min (95 LPM) 300 30 gal/min (114 LPM) 400 40 gal/min (151 LPM)

If water pressure is outside of adjustment range that will open switch with pump off and close switch with pump on, replace with flow switch set above minimum flow requirement.

Model Flow

200 20 gal/min (76 LPM)

175 20 gal/min (76 LPM)

250 25 gal/min (95 LPM) 300 30 gal/min (114 LPM) 400 40 gal/min (151 LPM)

Is ERR PS displayed on LCD?

YES

Verify that pump is on, filter is not blocked, and the water flow is above the minimum requirement.

Check that water pressure is within the adjustment range of the Pressure Switch (0-5 psig)

Verify that switch wiring is OK and Pressure Switch port is not blocked, and replace water Pressure Switch.

Check if any of the other Alarms are activated.

Go to ALARMS Diagnostics

(Pages 53 and 54).

Go to “Diagnostic. (Pages 53 and 54)

With pump running, adjust Water Pressure Switch to lower pressure until ERR PS goes out. Then verify that ERR PS goes on with pump off.

YES

CONTINUE

Minimum Flow Requirements

Section 5. Troubleshooting

Rev. M 8/2020 MASTERTEMP Pool and Spa Heater Installation and User’s Guide

Section 5. Troubleshooting

IGN is ON

Gas flow during ignition and burner fire for less than 7 seconds.

Gas flow during ignition try, but burner does not fire.

Check voltage across igniter leads, ok?

Replace ignition control module. On a 120 V installation check the ignitor for damage if it has seen 240 VAC.

Did blower come on?

YES

ALARMS: AGS, AFS, HLS, PS, E01 or 126

Verify connection to HSI igniter,

YES

HSI is not broken, flame current status.

YES

Check gas pressure. Ok?

Increase gas flow into heater:

• Replace gas line. with larger line.

• Replace regulator

• Replace meter, or

• All of the above.

Replace Control board.

YES

Replace HSI igniter

Verify that gas is flowing to burner during ignition try. Observe gas meter for movement during ignition try (wait for about 30 seconds after calling for heat)

Verify connection to HSI igniter, HSI is not broken, flame current status.

YES

Check for 24 VAC between VAL and GND terminals on ignition Control Module. SEE NOTE 2

YES

Check for 24 VAC between VAL and GND terminals on Control board. SEE NOTE 2

Fix wiring between VAL and GND terminals of Ignition Control Module and Control Board.

YES

Check for 24 VAC between TH and GND terminals on Ignition Control Module. SEE NOTE 1

Replace ignition Control Board.

YES

Check for 24 VAC between GAS terminals on Control Boards. SEE NOTE 2.

NONO

Replace Control board.

Verify that gas supply is open all the way to Gas Valve, and Gas Valve is set at “on” position. Check for 24 VAC to Gas Valve terminals during ignition try. (Voltage appears about 24 seconds after call for heat). SEE NOTE 2

Check for 24 VAC between

YES

TH and GND terminals on Control Board. SEE NOTE 1

YES

Fix wiring between TH and GND terminals of ignition Control Module and Control Board.

Fix wiring between GAS terminals on Control Board and Gas Valve.

NOTE 1:Voltage appears immediately after call for heat, and may be on for only about 30 seconds. NOTE 2: Voltage appears about 24 seconds after call for heat, and may be on for only about 7 seconds.

YES

Replace Gas Valve with identical part.

Replace Control Board.

MASTERTEMP Pool and Spa Heater Installation and User’s Guide Rev. M 8/2020

Diagnostic Alarms: AGS, AFS, HLS, PS, E01 or 126

Do not jumper a safety switch to

remedy a failed switch.

NOTE: ES1 is a spare and should be jumpered.

CAUTION

Service pump and filter to restore proper flow. After servicing, verify proper operation of Pressure Switch (PS).

Replace thermistor or Control Board to correct overheating.

Replace High Limit Switch (HLS)or Automatic Gas Shutoff (AGS)

If problem persists, verify proper operation of Internal Bypass Valve and Thermal Governor, and check for Heat Exchanger blockage.

YES

Verify that water flow rate is above minimum required for heater.

Verify that inlet water temperature is below 104° F.

YES

CONTINUE

YES

CONTINUE

Verify that there is no blockage in Blower intake, Heat Exchanger, and exhaust and that exhaust is not too long (see “Indoor Vent Installation”, Page 22.

Verify correct connection of wiring and that pressure taps to AFS are OK.

Verify that vinyl tubing to AFS and Blower is not misrouted, kinked, disconnected, or punctured.

Replace Air Flow Switch (AFS).

If problem persists, replace Blower.

Replace Blower.

Verify correct connection of wiring between 24 VAC and IND terminals on Ignition Control Module and Control Board, and replace Control Board.

YES

ERR AFS

Does Blower operate?

EO1 or 126

Verify Thermistor wiring. If OK, replace Thermistor.

Disconnect Blower and check for line voltage between pins 1 and 3 of Blower Connector on ignition try.

Connect correctly and retry. Does Blower start?

Replace Blower. Does Blower start on ignition try?

Replace Ignition Control Module.

Verify that wires BM and F1 are correctly connected at the terminal strip (see Heater Connection Diagram, Page 36).

Disconnect wires F1 and F2 from Ignition Control Module and short them together. Does Blower come on?

Check for 24 VAC between 24 VAC and GND terminals on Ignition Control Module on ignition try. Check that IND wire is correctly connected.

Service pump and filter to restore proper flow.

Verify that wiring is OK and pressure tap is not blocked. Replace Pressure Switch

CONTINUE

ERR PS

Verify that water flow rate is above minimum required for heater.

Adjust Water Pressure Switch to close with pump running and open with pump off.

YES

ERR AGS or ERR HLS

Section 5. Troubleshooting

Rev. M 8/2020 MASTERTEMP Pool and Spa Heater Installation and User’s Guide

Diagnostic Alarms: SFS

(HD )

(Basic)

Reset power to Heater and retry. Heater should fire.

Does the LCD show Error Code “E05” or “E06” ?

Heater starts and runs OK, but temperature of exhaust climbs to 450°–500° in 3–5 minutes.

Heater starts after several tries, exhaust temperature stays below 250°.

Heater doesn’t start at all (exhaust stays cold).

Check pressure and volume of fuel supply

Check the J3 and J6 connectors for corrosion/ looseness on the male pins.

Check continuity in wiring harness between Control Board and Probe. Continuity OK?

Disconnect the sensor and check continuity across its terminals. Resistance should be 3.5-4.0 megaohms.

= open circuit;

0 = shorted.

Does sensor check OK?

Clean/tighten pins as needed.

Reset power to Heater and retry. Heater should fire.

NOT OK

ERR SFS

Replace Stack Flue Sensor

Correct Fuel Supply, reset Heater and retry. Heater should fire correctly.

Repeat checks on fuel supply, Thermal Regulator, check for correct orifices, etc.

DONE

YES

Replace Heater Control Board.

Replace Heater Membrane Pad.

Reset power to Heater and retry. Heater should fire.

Check Heat Exchanger Coil for leaks, liming, soot, or low flow.

Correct problem; Heater should fire.

Check Heat Exchanger Coil for leaks, liming, soot, or low flow.

Check Thermal Regulator: Open at 120°?

Check Thermal-Regulator: seats correctly?

DONE

Replace Heater Membrane Pad.

Replace Heater Control Board.

Reset power to Heater and retry. Heater should fire.

DONE

YES

DONE

Section 5. Troubleshooting

MASTERTEMP Pool and Spa Heater Installation and User’s Guide Rev. M 8/2020

Burner Troubleshooting

SYMPTOM CAUSE REMEDY

Loud, high-pitched whine Flame is too rich. Verify pressure tap between gas valve

and blower inlet.

See page 15 and verify t hat the gas regulator setting is –0.2" (–0.5cm) wc.

Flame is “fluttery .” Flame is too lean. See page 16 and verify that t he gas Exhaust may have acrid regulator setting is –0.2" (–0.5cm) wc. smell or burner may fail to stay lit.

Burner pulsates or Exhaust vent is too long. Reduce length of exhaust vent and/or surges, especially on

number of elbows.

ignition.

Combustion appears Flame current is not Check for wet or damaged igniter with normal, but flame does being sensed.

low resistance to ground. Replace with

not stay lit.

new igniter.

Verify burner flameholder is properly grounded.

Ignition Control Module.

Heat Exchanger Troubleshooting

SYMPTOM CAUSE REMEDY

Boiling in heat exchanger. Low water flow to heater. pump and or filter. May be accompanied by

Heat exchanger plugged. Service

Service

heat exchanger. Correct water

“bumping” sounds.

chemistry.

Bypass valve stuck open. Service bypass valve.

Thermal governor stuck Replace

Replace

Contact a qualified technician or service agency to replace the gas orifice.

thermal governor.

closed.

Sweating. Thermal governor failed. thermal governor.

Section 5. Troubleshooting

Rev. M 8/2020 MASTERTEMP Pool and Spa Heater Installation and User’s Guide

Drill through the NPT Port, then use a 3/4" x 2.50 (2.0 cm x 6.35 cm) Brass Nipple and Elbow (user supplied) for a PRV Installation

3/4” x 2.0” Brass Nipple (2.0 cm x 5.08 cm)

PRV

3/4” x 3.5” Brass

Nipple

(2.0 cm x 8.89 cm)

Section 6. Maintenance

Maintenance

CARE AND MAINTENANCE

WARNING

Risk of ﬁre or explosion from ﬂammable vapors. Do not store gasoline, cleaning ﬂuids, varnishes, paints, or other volatile ﬂammable liquids near heater or in the same room with heater.

The following maintenance is recommended every six months and at the start of every swimming season:

1. Inspect the heater panels and venting system to make sure that there are no obstructions to the ow of ventilating air or burner exhaust. Check that room air intakes are open and clear of obstructions.

2. Keep the area in and around the heater clear and free from combustible materials, gasoline and other ammable vapors and corrosive liquids.

3. Test the operation of the pressure relief valve by lifting the valve lever (if installed).

4. Test for proper operation of the water pressure switch. (See “WATER PRESSURE SWITCH” (page 44) for testing

instructions).

5. On enclosed installations with high-temperature Special Gas Vent systems, repeat the “Final Installation Check,”

page33.Check for evidence of joint leakage. Make sure that joints have not slipped partially or completely apart.

Check pipe and ttings for cracks or breaks. The combustion air blower is permanently lubricated, and does not require periodic lubrication. The burner does not require maintenance or adjustment by the user. Call a qualied

service technician if you suspect that the burner may require maintenance.

PRESSURE RELIEF VALVE (NOT FACTORY INSTALLED)

Canadian code requires and some U.S. local codes may require installation of a Pressure Relief Valve (PRV). Purchase separately and install (P/N 460925) a 3/4” pressure relief valve complying with the ANSI/ASME Boiler and Pressure Vessel Code, having a capacity equal to the Btu/hr rating of the heater. The relief pressure of the valve MUST NOT EXCEED 50 PSI. The relief valve must be installed vertically. To install the valve, use a 3/4” x 3-1/2” brass nipple at the manifold and two (2) brass elbows and nipples (supplied), as shown in Figure 34. No valve

is allowed to be placed between the manifold adapter and the relief valve.

Note:Besuretousethreadedsealtape(PTFE)orequivalent,onall

treadedmetalpipeconnections.

To avoid water damage or scalding from operation of the relief valve, install a drain pipe in the outlet of the pressure relief valve that will direct

water discharging from the valve to a safe place for disposal. DO NOT

install any reducing couplings or valves in the drain pipe. The drain pipe

must be installed as shown in Figure 43 to allow complete drainage from

the valve and drain line. Important! The relief valve should be tested at

least once a year by lifting the valve lever.

NOTE: FOR NEW HEATER INSTALLATION:

For rodent heater protection, please refer to next page for gas pipe escutcheon installation.

MASTERTEMP Pool and Spa Heater Installation and User’s Guide Rev. M 8/2020

Figure 43.

Section 6. Maintenance

Water Pipe Escutcheon Installation

OptionalPressureReliefValveEscutchen:Note: If the heater is equipped with an optional Pressure Relief Valve, use the escutcheon on the Pressure Relief Valve water pipe. If required, before installing the escutcheon, carefully remove the round Pressure Relief Valve knock out from the heater panel.

The pressure relief water pipe escutcheon ensures the heater is rodent resistant. The following describes how to install the water pipe escutcheon for a new heater installation. The water pipe escutcheon should be installed when the water pipe is being installed to the heater. Seepage61forpartslist.

Toinstallthewaterpipeescutcheon:

1. Place the water pipe escutcheon over the water pipe, seeFigure44.

2. Slide the escutcheon ush against the heater panel.

4. Hand-tighten the retention screw to secure the escutcheon in place.

Tool: Phillips Screwdriver

Escutcheon

retaining

screw

Escutcheon

installed over

water pipe

Figure 44. Water Pipe with Escutcheon Installed.

(with optional Pressure relief valve shown)

Rev. M 8/2020 MASTERTEMP Pool and Spa Heater Installation and User’s Guide

Section 6. Maintenance

AFTER START-UP

CHECKING WATER FLOW

WARNING

FIRE OR FLOODING HAZARD. IF THE UNIT OVERHEATS AND THE BURNER FAILS TO SHUT OFF, FOLLOW INSTRUCTIONS UNDER “TO TURN OFF GAS TO THE APPLIANCE” (PAGE 43), AND CALL A QUALIFIED SERVICE TECHNICIAN TO REPAIR UNIT.

After start-up, the outlet water pipe should feel slightly warmer than the inlet pipe. If it feels hot, or if you hear the water in the heater boiling, there may not be enough water ow to the appliance. Make sure that the lter is not plugged. If water temperature remains

high but the unit continues to operate, turn off the appliance and call your service technician.

SPRING AND FALL OPERATION

If the pool is only used occasionally, lower the pool thermostat to 68° F (20° C) and leave the heater on. This will keep the pool and

the surrounding ground warm enough so that the heater should restore the pool to a comfortable temperature within about one day.

WINTER OPERATION

CAUTION

Operating this heater continuously at water temperatures below 68° F. (20° C) will cause harmful condensation and will damage the heater and void the warranty.

If the heater has been drained for freezing condition, do NOT turn “ON” until the system is circulating water.

Water trapped in the heat exchanger can result in freeze damage to the exchanger or headers. Freeze damage is speciﬁcally not covered by the warranty.

When starting the heater for the swimming season with a water temperature below 50° F (10° C), the heater may be used to heat the water; however, make sure that the heater operates continuously until the water temperature reaches the heater’s minimum setting of 68° F (20° C). During cold weather, if there is no danger of freezing, operate the ﬁlter pump continuously even if the heater is not operating. If air temperatures are expected to drop below freezing (32° F/0° C), shut down the heater

and winterize it.

For outdoor heaters in freezing climates, shut the heater down and drain it for winter as follows:

1. Turn off electrical supply to the heater and pump.

2. Close main gas control valve and manual gas valve (located outside the heater). Turn switch on heater gas valve to OFF.

3. In northern climates where they may be required, open drain cock located on the bottom of the manifold adapter, and drain the heat exchanger and manifold adapter completely. If heater is below pool water level, be sure to close isolation valves to prevent draining the pool (isolation valves are not required and should not be used on heaters installed above pool water level except when needed for winterizing valves). Assist the draining by blowing out the heat exchanger through the pressure switch tting with

low pressure compressed air (less than 5 PSI or 35 kPa).

WARNING

Explosion hazard. Purging the system with compressed air can cause components to explode, with risk of severe injury or death to anyone nearby. Use only a low pressure (below 5 PSI or 35 kPa), high volume blower when air purging the heater, pump, ﬁlter, or piping.

4. Remove the Water Pressure Switch. Plug the port in the manifold to prevent bugs and dirt from getting into the manifold.

5. Drain the plastic inlet/outlet manifold through the outlet pipe. If the pipe does not drain naturally to the pool, install a drain cock

in the outlet pipe to drain the manifold.

6. Cover air inlet grate with a plastic bag to prevent bugs, leaves, etc., from getting into the heater.

NOTICE: Water trapped in the heater can cause freeze damage. Allowing the heater to freeze voids the warranty.

MASTERTEMP Pool and Spa Heater Installation and User’s Guide Rev. M 8/2020

Section 6. Maintenance

To return the heater to service after winterizing: Close drain cock and ttings. Before starting the

heater, circulate water through the heater for several minutes until all air noises stop. See also “BEFORE START-UP” (page42)and “CARE AND MAINTENANCE” (page56).

(See additional notes under Important Notices in Introduction.)

MAINTAINING POOL TEMPERATURE

Tomaintainpooltemperature,makesurethattheheaterswitchandvalvingareresettopoolsettingsafterusing thespa.

ENERGY SAVING TIPS

1. Keep the pool or spa covered when not in use. This will reduce heating costs, reduce water evaporation, conserve

chemicals and reduce load on the ltering system.

2. Reduce pool thermostat to 78° F (25° C) or lower; reduce spa temperature to 100° F (38° C). This is accepted as

being the most healthy temperature for swimming by the American Red Cross.

3. Use a time clock to start the lter pump at 6 a.m. or later. The swimming pool loses less heat after daybreak.

4. For pools used only on weekends, lower the thermostat setting by 10° F to 15° F (5° C to 8° C) during the week to

reduce heat loss. A properly sized heater will restore normal temperature within one day.

5. Turn the heater off when the pool will not be used for an extended period.

6. Follow a regular program of preventive maintenance for the heater each new swimming season. Check operation of

the heater and its controls.

CHEMICAL BALANCE

POOL AND SPA WATER

Your pool heater was designed specically for your spa or pool and will give you many years of trouble-free service,

provided you keep your water chemistry in proper condition.

Water chemistry should follow good swimming pool water chemistry practices. When using a chlorinator, install it down stream from the heater and at a lower level than the heater outlet. Install a corrosion resistant positive seal “Check Valve”, (P/N R172288), between the heater and the chlorinator to prevent concentrated chemicals from back-siphoning into the heater. 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.

Three major items that can cause problems with your pool heater are: improper pH, disinfectant residual, and total

alkalinity. These items, if not kept properly balanced, can shorten the life of the heater and cause permanent damage.

CAUTION

Heat exchanger damage resulting from chemical imbalance is not covered by the warranty.

WHAT A DISINFECTANT DOES

Two pool guests you do not want are algae and bacteria. To get rid of them and make pool water sanitary for swimming

- as well as to improve the water’s taste, odor and clarity - some sort of disinfectant must be used. Chlorine and bromine

are universally approved by health authorities and are accepted disinfecting agents for bacteria control.

Rev. M 8/2020 MASTERTEMP Pool and Spa Heater Installation and User’s Guide

Section 6. Maintenance

CHEMICAL BALANCE, (continued)

It is wise to test pool water regularly. Never allow chlorine residual to drop below 0.6 ppm (parts per million). The

minimum level for effective chlorine or bromine residual is 1.4 ppm.

pH- The term pH refers to the acid/alkaline balance of water expressed on a numerical scale from 0 to 14. A test kit for

measuring pH balance of your pool water is available from your local pool supply store; seeTable9.

Muriatic Acid has a pH of about 0. Pure water is 7 (neutral). Weak Lye solution have a pH of 13-14.

NOTE:7.4to7.6isadesirablepHrange.ItisessentialtomaintaincorrectpH,seeTable9.

IfpHbecomestoohigh(overalkaline),ithastheseeffects:

1. Greatly lowers the ability of chlorine to destroy bacteria and algae.

2. Water becomes cloudy.

3. There is more danger of scale formation on the plaster or in the heat exchanger tubing.

4. Filter elements may become blocked.

IfpHistoolow(overacid)thefollowingconditionsmayoccur:

1. Excessive eye burn or skin irritation.

2. Etching of the plaster.

3. Corrosion of metal xtures in the ltration and recirculation system, which may create brown, blue, green, or

sometimes almost black stains on the plaster.

4. Corrosion of copper tubes in the heater, which may cause leaks.

5. If you have a sand and gravel lter, the alum used as a lter aid may dissolve and pass through the lter.

CAUTION: Do not test for pH when the chlorine residual is 3.0 ppm or higher, or bromine residual is

6.0 ppm or higher. See your local pool supply store for help in properly balancing your water chemistry.

NOTE: Chemicals that are acid lower pH. Chemicals that are alkaline raise pH.

ALKALINITY High or Low:

“Total alkalinity” is a measurement of the total amount of alkaline chemicals in the water, and control pH to a great degree. (It is not the same as pH which refers merely to the relative alkalinity/acidity balance.) Your pool water’s total alkalinity should be 100 - 140 ppm to permit easier pH control. A total alkalinity test is simple to perform with a reliable test kit. You will need to test about once

a week and make proper adjustments until alkalinity is in the proper range. Then, test only once every month or so to be sure it is being maintained. See your local pool dealer for help in properly balancing the water chemistry.

WATER CHEMISTRY PARAMETERS

Disinfectant levels Minimum Ideal Maximum

Free Chlorine, ppm 1.0 2.0-4.0 5.0** Combined Chlorine, ppm None None 0.2 Bromine, ppm 2.0 4-6 10.0 Other Sanitizers Levels not established. Consult local health department before use.

Chemical Values

pH 7.2 7.4-7.6 7.8** Total Alkalinity (Buffering), ppm 60 80-100 180 as CaCO3 Salt ppm 2000 3200 5000** Total Dissolved Solids, ppm N/A N/A 1,500 ppm > TDS at startup* Calcium Hardness, ppm, as CaCO3 150 200-400 500-1,000 Heavy Metals None None None

Biological Values

Algae None None None Bacteria None None Refer to Local Code

*Start-up TDS includes source water TDS and any other inorganic salt added at start-up.

NOTE (**): Failure to adhere to the listed water chemistry parameters may result in premature failure of the heat exchanger and will void the heater warranty.

MASTERTEMP Pool and Spa Heater Installation and User’s Guide Rev. M 8/2020

Table 9.

Repair Parts are available from a Pentair dealer.

If your dealer cannot supply you, call Customer Support at 1-800-831-7133.

Para una lista detallada de las Piezas del Sistema del Quemador (Números del 5 al 7), ver página 62

Para una lista detallada de las Piezas del Sistema de Agua (Números del 8 al 9), ver página 64.

31/32

Lista de piezas resistentes a roedores (consulte también la página 62)

29. N / P 476155Z - Tornillo, autoperforante, cabeza hexagonal (usar con N/P 467150Z)

30. P / N 476150Z - Escape con escudo, calentador MasterTemp resistente a roedores

31. P / N 462037Z - Inserto del colector de agua, solo calentador MasterTemp

32. P / N 462038Z * - Inserto del colector de agua, solo calentador ASME MasterTemp

33. P / N 467107Z - Escudo de tubería de gas

34. P / N 270114Z - Tornillo Phillips (# 8), para escudo (usar con P/N 467107Z) (*) Para calefactores ASME, se usa el N/P 462038Z en lugar del N/P 462037Z.

Escutcheon

Para una lista detallada de las Piezas del Sistema Eléctrico (Números del 1 al 4), ver página 65.

Section 7. Replacement Parts

MASTERTEMP HEATER REPLACEMENT PARTS

Rev. M 8/2020 MASTERTEMP Pool and Spa Heater Installation and User’s Guide

For heaters manufactured between 1/12/2009 and 10/31/2013 (clamp lid tub design) Note: Kits also include Clamp Assembly, O-Ring and Silicon Tube (see page 63)

Combustion Chamber Gasket

Lid Nut/Washer (9x)

CLAMP LID TUB DESIGN

31/32

Escutcheon

29. P/N 476155Z

30. P/N

476150Z

31. P/N

462037Z

32. P/N

462038Z*

33. P/N 467107Z

34. P/N 270114Z

(*) For ASME heaters P/N 462038Z is used instead of P/N 27589Z.

Rodent Resistant Parts List (see page 63)

Section 7. Replacement Parts

MASTERTEMP® HEATER REPLACEMENT PARTS

MASTERTEMP Pool and Spa Heater Installation and User’s Guide Rev. M 8/2020

MASTERTEMP HEATER REPLACEMENT PARTS

REPAIR PARTS – BURNER SYSTEM

Model

Key Part 200NA 300NA 400NA

No. Description

Qty.

200LP 300LP 400LP

1 Combination Gas Control Valve Kit 42001-0051S 42001-0051S 42001-0051S

23/4" Union

38404-4097S 38404-4097S 38404-4097S

3Gas Orifice

4Gas Orifice O-Ring

•Gas Orifice Kit – NG (Incl. Key Nos. 3 and 4)† 77707-0431 460753 77707-0411

•Gas Orifice Kit – Propane (Incl. Key Nos. 3 and 4)† 77707-0461 460754 77707-0441

•NG to Propane Conversion Kit

(Incl. Key Nos. 3 and 4)† 77707-1461 460755 77707-1441

•Propane to NG Conversion Kit

(Incl. Key Nos. 3 and 4)† 77707-1431 460756 77707-1411

5Air Blower Kit

Natural Gas Units 77707-0251 460757 77707-0253

Propane Units 77707-0254 460758 77707-0256

•Air Orifice Kit (Includes Key Nos. 6 and 7) 77707-0111 460759 77707-0113

6Air Orifice

7Air Orifice Grill 42001-0114S 42001-0114S 42001-0114S

•Blower/Adapter Plate Gasket Kit

(Includes Key Nos. 8, 9, 10, 12) 77707-0011 77707-0011 77707-0011

•Flameholder Kit (Includes

Key Nos. 10, 11 , 12, 13 and on 300 & 400

models only - Flameholder Insert) 77707-0202 77707-0203 77707-0204

8Blower/Adapter Plate Gasket

9Blower Adapter Plate

10 Flameholder/Adapter Plate Gasket

11 Flameholder Assembly

12 Flameholder/Combustion Chamber Gasket*

13 Flameholder Insulation Cap

•Flameholder Insert

14 Condensate Evaporator Plate

15 One Piece Metal Chamber/Combustion Chamber

Assembly

474095 474095 474095

•Insulation Kit (Includes Key No. 13, 14, 16, 17,18,19)

77707-0008 77707-0008 77707-0008

16 Bottom Outer Insulation Blanket*

17 1" Bottom Inner Insulation

18 1" To p Insulation

19 Top Outer Insulation Blanket*

• Lower Enclosure Insulation 42001-0074S 42001-0074S 42001-0074S

20 One Piece Metal Elbow/Combustion Chamber

Cover Assembly 474094 474094 474094

21 Metal Vent Cover 42002-0005S 42002-0005S 42002-0005S

Cover Assembly 42001-0214S 42001-0214S 42001-0214S

22 Heater Top 42002-0034Z 42002-0034Z 42002-0034Z

Side Panel {Service Panel} 42002-0039 42002-0039 42002-0039

24 Side Panel {Manifold} 42002-0033 42002-0033 42002-0033

Heater Bottom 42002-0031 42002-0031 42002-0031

Side Panel {Flue Stack} 42002-0032 42002-0032 42002-0032

27 J-Box Cover 42002-0041 42002-0041 42002-0041

28 Screw Kit, Panel

Not available separately.

†

Not included with heater. Order separately .

For heaters manufactured between 1/12/2009 and 10/31/2013 (clamp lid tub design) Note: Kits also include Clamp Assembly, O-Ring and Silicon Tube.

•

Combustion Chamber O-Ring Kit

474957

Combustion Air Intake Duct Connection Kit

•

1 461031 461031 461031

474292 474292 474292

For heater manufactured AFTER 10/31/2013 (New 9-bolt lid tub design) For heater manufactured BEFORE 1/12/2009

42001-0200S 42001-0200S

474957

42001-0214S 42001-0214S

474201 474201

474201

42001-0214S

474957

Rev. M 8/2020 MASTERTEMP Pool and Spa Heater Installation and User’s Guide

Section 7. Replacement Parts

REPAIR PARTS – WATER SYSTEM

*Not available separately. • Not illustrated.

Model

Key Part 175NA - 200NA 300NA 400NA

No. Description Qty. 175LP - 200LP 300LP 400LP

1Tube Sheet Coil Assembly Kit (NA, LP Series)

(Includes Key No.3) 177707-0232 77707-0233 77707-0234

474058 474060 474061

––

1Tube Sheet Coil Assembly Kit (NA - HD Series)

(Includes Key No.3) 1 77707-0244

– – 474065

For heaters manufactured between 1/12/2009 and 10/31/2013 (clamp lid tub design) - Note: Kits also include Clamp Assembly, O-Ring and Silicon Tube.

2Manifold Kit (Includes Key Nos. 3-14, 21, &

Key Nos. 5-7 in “Electrical System”, Page 53 177707-0014 77707-0015 77707-0016

3Coil/Tubesheet Sealing O-Ring Kit 77707-0117(6) 77707-0118(10) 77707-0119(12) 4 Manifold Bottom Plate 5Manifold O-Ring 1

•O-Ring Kit (Incl. Key Nos. 3, 5) 177707-0120 77707-0120 77707-0120 6 Manifold Insert* 1 7 Manifold Baffle Plate 8Manifold Bypass Valve 1

9Water Pressure Switch 42001-0060S 42001-0060S 42001-0060S 10 Manifold 1 11 5/16"Washer, S.S. 10 12 5/16x18x2-3/4"Hex Cap screw 10 13 Connector Tube O-Ring 2 14 Connector Tube Kit (Includes 1 Connector Tube

and1O-Ring) 277707-0017 77707-0017 77707-0017

15 Thermal Regulator Kit

(Incl. Key No. 16, 17, 18, 19 and Spring Clip) 77707-0010 77707-0010 77707-0010 16 Thermal Regulator (Includes Spring Clip) 38000-0007S 38000-0007S 38000-0007S 17 Thermal Regulator Spring 1

18 Thermal Regulator Cap O-Ring 1 35505-1313 35505-1313 35505-1313

• Thermal Regulator Spring Clip 1

1 1

19 Thermal Regulator Cap 20 Drain Plug U178-920P U178-920P U178-920P 21 3/4" Pipe Plug 1U78-60ZPS U78-60ZPS U78-60ZPS 22 Pressure Relief Valve (Recommended -

(Purchase Separately) 1 38674-0719 38674-0719 38674-0719

• Basic Manifold Kit (includes Key No. 3,5,10-14) 474200 474200 474200

( )

––

1Tube Sheet Coil / Combustion Chamber Kit (ASME SERIES)

Bronze Header - Key Nos. 3-12, 15, 20-22, 1 460940

472732Z – 474096

474350,

474953

–

77707-0001 77707-0001 77707-0001

Tube Sheet Coil / Combustion Chamber Kit (HD ASME SERIES)

For ASME heater manufactured AFTER 10/31/2013 (New 9-bolt lid tub design) For heater manufactured BEFORE 1/12/2009

– 474956

U9-226 U9-226 U9-226

Section 7. Replacement Parts

MASTERTEMP HEATER REPLACEMENT PARTS

MASTERTEMP Pool and Spa Heater Installation and User’s Guide Rev. M 8/2020

Section 7. Replacement Parts

MASTERTEMP HEATER REPLACEMENT PARTS

REPAIR PARTS – ELECTRICAL SYSTEM

Model

Key Part 200/300/400 NA

No. Description Qty. 200/300/400 LP

1Heater Display Cover 1 42002-0035

2Igniter Bracket 1 42001-0030S

3 Igniter/Igniter Gasket Kit Incl. Key Nos. 3 and 4) 1 77707-0054

4Igniter Gasket 1 42001-0066S

5 Automatic Gas Shutoff Switch (AGS) 1 42002-0025S

6High Limit Switch 1 42001-0063S

7 Thermistor 1 42001-0053S

8Terminal Board 1

9 Fireman’s Switch Fuse (1.25A, 1-1/4") 32850-0099

10 Ignition Control Module 1 476223

11 Transformer, 120/240V 1 42001-0107S

12 Air Flow Switch 42001-0061S

13 RS485 Control board & Membrane Pad Combo kit 1 461105

• Heater Wiring Harness - 120/240V 1 461107

• 120/240 Volt Plug Kit 42001-0105S

RS485 Membrane Pad (NA & LP)

• Legacy RS-485 Conversion Combo kit

Membrane Pad (NA, LP Series) (Legacy) 472610Z

•

15 Heater, Top 42002-0034Z

17 Stack Flue Sensor 1 42002-0024S

Kit Includes: RS-485 control board, RS-485 membrane pad, Ignition Control Module and flame current wire.

Not Shown•

42001-0056S

1 461106

1 476211

Rev. M 8/2020 MASTERTEMP Pool and Spa Heater Installation and User’s Guide

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All indicated Pentair trademarks and logos are property of Pentair Inc. or its global aliates in the U.S.A. and/or other countries. Third party

registered and unregistered trademarks and logos are the property of their respective owners

P/N 472592 Rev. M 8/2020

Pentair MASTERTEMP User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual