Pentair 175K BTU/HR, 200K BTU/HR HD ASME, 200K BTU/HR ASME, 250K BTU/HR, 300K BTU/HR Installation And User Manual

1

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 fire or explosion may result, causing
property damage, personal injury or loss of life. For additional free copies of this
manual; call [phone].

FOR YOUR SAFETY - This product must be installed and serviced by authorized personnel, qualified inpool/spa
heater installation. Improper installation and/or operation can create carbon monoxide gas and flue gases which can
cause serious injury, property damage, or death. For indoor installations, as an additional measure of safety, Pentair
Aquatic Systems 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

200K BTU/HR 460730 460731
200K BTU/HR
250K BTU/HR 460732 460733
250K BTU/HR (HD) 460806 –
250K BTU/HR

250K BTU/HR
300K BTU/HR 460734 460735

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

400K BTU/HR

(ASME)

(HD ASME)

(ASME)
(HD ASME)

(ASME)
(HD ASME)

461000 461001

461032 –

460771 460772
461020 –

460775 460776
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 qualified 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.
Follow the gas supplier's instructions.

• If you cannot reach your gas supplier, call the fire dep artment.

SAFETY

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

1620 Hawkins Ave., Sanford, NC 27330 • [phone] or [phone]

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

Rev. M 1-8-15 MASTERTEMP® Pool and Spa Heater Installation and User’s Guide

Pentair Water Pool and Spa, Inc.

• [phone] or [phone]

2

Customer Service and Tecnincal Support

If you hav e questions about ordering P entair Quality Water Systems replacement parts, and
pool
products, please call:

Phone: [phone]
Fax: [phone]

(8 A.M. to 7:00 PM Eastern Time/P acific Time)
Web sites: www.pentairpool.com - www.staritepool.com

P/N 472592 Rev. M 1/2015

MASTERTEMP® Pool and Spa Heater Installation and User’s Guide Rev. M 1-8-15

Contents

Section 1. Heater Identification Information ....................................................................... 4

Section 2. Warning and Safety Information ......................................................................... 5

Important Notices................................................................................................................................................................................. 5

Warranty Information ............................................................................................................................................................................ 5

Code Requirements .............................................................................................................................................................................. 6

Consumer Information and Safety Information ...................................................................................................................................... 6 - 9

General Specifications ......................................................................................................................................................................... 9

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

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

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

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

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

Valves.................................................................................................................................................................................................. 12

Manual By-Pass .................................................................................................................................................................................. 12

Water Connections ............................................................................................................................................................................... 13

Below Pool Level Installation ................................................................................................................................................................ 13

Gas Connections ................................................................................................................................................................................. 14

Sediment Traps.................................................................................................................................................................................... 14

Gas Pipe Sizing ................................................................................................................................................................................... 15

T esting Gas Pressure/Gas Pressure Requirements ............................................................................................................................. 15-16

Outdoor Installation (US and Canada) / Heater Clearances .................................................................................................................. 16

Outdoor Installation Venting Guidelines ................................................................................................................................................ 17

Indoor Venting — General Requirements (Category I and Category III requirements) ......................................................................... 18

Heater Clearances — General Requirements (Indoor Installation for US or Outdoor Shelter for Canada) ............................................. 18

Outside Vent Cover Removal ............................................................................................................................................................... 18

Combustion Air Supply /Direct Air Intake Duct with 3-inch PVC Pipe (Indoor Installation)..................................................................... 19-20

Corrosive V apors and Possible Causes ................................................................................................................................................ 20

V ent Installation (Indoor Installation for U.S. or Outdoor Shelter for Canada) ........................................................................................ 21

V ertical Venting - Negative Pressure ................................................................................................................................................... 21 - 23

Horizontal or V ertical Venting - Positive Pressure................................................................................................................................ 24

Connecting Special Gas Venting .......................................................................................................................................................... 24 - 26

Outdoor Shelter Vent Installation.......................................................................................................................................................... 27

Garage or Utility Room Installation ....................................................................................................................................................... 27

Control Panel Indexing ......................................................................................................................................................................... 28

Final Installation Check ........................................................................................................................................................................ 28

Electrical Connections...............................................................................................................................

Fireman’s Switch Connection/Remote Control Connections..................................................................................................................

MasterT

emp Heater Wiring Diagram ..................................................................................................................................................... 31

Electrical Schematic Ladder Diagram ................................................................................................................................................... 32

Section 4. Operation ............................................................................................................... 33

Basic System Operation ...................................................................................................................................................................... 33

HSI (Hot-Surface Ignition) Lighting/Operation ....................................................................................................................................... 33

Operating ............................................................................................................................................................................................. 34

To Turn Off Gas to Appliance............................................................................................................................................................... 34

Safety Controls .................................................................................................................................................................................... 35 - 37

Section 5. Troubleshooting ................................................................................................... 38

Initial Troubleshooting and Troubleshooting Chart ................................................................................................................................. 38

Heater Will Not Fire Troubleshooting .................................................................................................................................................... 39 - 42

LED Diagnostics .................................................................................................................................................................................. 43 - 44

Burner / Heat Exchanger Troubleshooting ............................................................................................................................................ 45

Section 6. Maintenance ..........................................................................................................46

Care and Maintenance.......................................................................................................................................................................... 46

Pressure Relief V alve........................................................................................................................................................................... 46

After Start-Up ...................................................................................................................................................................................... 47

Spring, Fall and Winter Operation ......................................................................................................................................................... 47

Maintaining Pool T emperature............................................................................................................................................................... 48

Energy Saving Tips.............................................................................................................................................................................. 49

Chemical Balance ................................................................................................................................................................................ 48 - 49

Replacement Parts .............................................................................................................................................................................. 50 - 54

........................................... 29

3

30

Rev. M 1-8-15 MASTERTEMP® Pool and Spa Heater Installation and User’s Guide

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

a. Heater Identification Number (HIN)

The following example simplifies the identification 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)

HEATER IDENTIFICATION INFORMATION — (HIN)

Model Number and the other is the Heater Identification Number (HIN).

(HD = Heavy Duty Model)
(ASME = ASME Certified Model)
(HD ASME = Heavy Duty ASME Model)

H. I. N.

HEATER IDENTIFICATION NUMBER

ID DESIGNATOR FOR PENTAIR AQUATIC SYSTEMS MASTERTEMP HEATERS

Example:

1 2 3 4

MT 250 NA ASME

STD = STANDARD MODEL

CONSTRUCTION =

FUEL TYPE =

MODEL SIZE = BTU INPUT in 1000 of BTU / HR

HD = HEAVY DUTY MODEL

ASME = ASME CERTIFIED MODEL
HD ASME = HEAVY DUTY ASME MODEL

NA = NATURAL GAS
LP = PROPANE GAS

®

MASTERTEMP® Pool and Spa Heater Installation and User’s Guide Rev. M 1-8-15

MT = MASTERTEMP

Section 2. Warning and Safety Instructions

Section 2: Warning and Safety Instructions

IMPORTANT SAFETY INSTRUCTIONS

READ AND FOLLOW ALL INSTRUCTIONS

SAVE THESE INSTRUCTIONS

5

MASTERTEMP

®

Pool and Spa Heater

Congratulations on your purchase of the MasterT emp 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, efficient, induced-draft, gas fired 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.

SPECIAL INSTRUCTIONS TO OWNER: Retain this manual for future reference. This instruction manual provides
operating instructions, installation and service information for the MasterT emp 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.

IMPORT ANT NO TICES

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 Aquatic
Systems at [phone].

W ARRANTY INFORMA TION

The MasterTemp pool and spa heater is sold with a limited factory warranty. Specific details are described on the
warranty registration card which is included with the product. Return the warranty registration card after filling in

the serial number from the rating plate inside the heater.

Pentair Aquatic Systems 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 specifications of the
heater without incurring an obligation to update the current heater equipment.

These heaters are designed for the heating of chlorine, bromine or salt system swimming pools and spas or
in non-stationary installations, and should never be employed for use as space heating boilers or general
purpose water heaters. The manufacturer’s warranty may be void if, for any reason, the heater is improperly
installed and/or operated. Be sure to follow the instructions set forth in this manual.

CAUTION

OPERATING THIS HEATER CONTINUOUSLY AT WATER TEMPERATURE BELOW 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 1-8-15 MASTERTEMP® Pool and Spa Heater Installation and User’s Guide

6

Section 2. W arning and Saf ety 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
Electric Code, part 1.as applicable.

D ANGER

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 INFORMA TION 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 first 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.

6 . Persons taking medication which induce drowsiness, such as tranquilizers, antihistamines or anticoagulants should not use spas

or hot tubs.

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 1-8-15

W ARNING

Section 2. Warning and Safety Instructions

7

SAFETY INFORMA TION

The MasterTemp® pool heaters are designed and manufactured to provide many years of safe and reliable service when
installed, operated and maintained according to the information in this manual. Throughout the manual, safety warnings and
cautions are identified by the “ “ symbol. Be sure to read and comply with all of the warnings and cautions.

DANGER —

CARBON MONOXIDE GAS IS DEADLY

READ OWNERS MANUAL COMPLETELY BEFORE OPERATING

THIS PRODUCT MUST BE INSTALLED AND SERVICED BY A PROFESSIONAL SERVICE
TECHNICIAN, QUALIFIED IN POOL HEATER INSTALLATION. Some jurisdictions require that
installers be licensed. Check with your local building authority about contractor licensing requirements.
Improper installation and/or operation could create carbon monoxide gas and flue gases which could cause
serious injury or death. Improper installation and/or operation will void the warranty.

Exhaust from this pool heater contains 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 1-8-15 MASTERTEMP® Pool and Spa Heater Installation and User’s Guide

8

SAFETY INFORMA TION, (cont’d.)

WARNING —

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.

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.

Section 2. Warning and Safety Instructions

WARNING —

WARNING —

WARNING —

CAUTION —

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).

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.

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 24 for Part Numbers for Conversion Kits) is available for installations
in enclosures (Canada) or indoors (U.S.). Use the specified venting, and only the specified venting,
when heater is installed in an enclosure or indoors. In Canada, this pool heater can only be installed
outdoors or in an enclosure that is not normally occupied and has no openings directly into occupied
areas. See Page 19 for enclosure venting requirements.

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 1-8-15

Section 2. Warning and Safety Instructions

9

CONSUMER INFORMA TION 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 certified 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 SPECIFICA TIONS

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 18).

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 1-8-15 MASTERTEMP® Pool and Spa Heater Installation and User’s Guide

10

Section 3: Installation Instructions

HEA TER DESCRIPTION

Section 3. Installation Instructions

Figure 1 is a diagram of the heater showing how it operates. Precisely

Gas

matched orifice 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 flame holder. A sealed heat exchanger surrounds the
flame holder, dischar ging exhaust gases out the flue.

T wo 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.

Inlet
(Cold
Water)

Air

Mixer

Blower

Exhaust

A thermal regulator and an internal bypass regulate the water flow
through the heat exchanger to maintain the correct outlet
temperature. The heater operator control panel board assembly is
located on top of the heater.

SEQUENCE OF OPERA TION

Outlet
(Mixed
Water)

Burner

Heating Coils

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 flow switch (AFS), which senses the pressure drop across the air metering orifice,

• the automatic gas shut-off (AGS) switch, which opens if the heat exchanger outlet temperature goes above 140° F

(60° C).

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

The air flow switch (AFS) senses the pressure drop across the air metering orifice. As soon as there is suf ficient air flow,
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 flame.

The heater is equipped with a digital operating control that enables the user to pre-set the desired pool and spa water
temperatures. The control enables the user to select between pool and spa heating, and features a digital display that
indicates the water temperature.

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, in the SAFETY CONTROLS Section.

Before putting the heater into service for the first time, follow the instructions under “BEFORE ST AR T -UP” (page 33) in
the front of this manual. Check for proper operation of the heater by following the steps under “OPERATION
INSTRUCTIONS.”

Damage to equipment caused by improper installation or repair will void the warranty.

MASTERTEMP® Pool and Spa Heater Installation and User’s Guide Rev. M 1-8-15

Section 3. Installation Instructions

SPECIFICATIONS

These installation instructions are designed for use by qualified personnel only, trained especially for installation of this
type of heating equipment and related components. Some states require installation and repair by licensed personnel. If
this applies in your state, be sure your contractor bears the appropriate license. See Figure 2 for Outdoor and Indoor
Installations.

DIMENSIONS IN INCHES

23.02"

(58.5 cm)

11

16"

(40.6 cm)

28.15"

(71.5 cm)

ELECTRICAL
CONDUIT PORT

32.61"

(82.8 cm)

21.0"

(53.3 cm)

TOPFRONT

EXHAUST SIDE

Rev. M 1-8-15 MASTERTEMP® Pool and Spa Heater Installation and User’s Guide

16.0"

(40.6 cm)

22.7"

(57.7 cm)

28.2"

(71.6 cm)

Figure 2.

PLUMBING SIDE

5.6"

(14.2 cm)

10.13"

(25.7 cm)

12

PLUMBING CONNECTIONS

The MasterTemp heater has the unique capability of direct
schedule 40 PVC plumbing connections. A set of bulkhead
fittings 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.

Section 3. Installation Instructions

CAUTION

POOL
HEATER

Before operating the heater on a new installation, turn
on the circulation pump and bleed all the air from the

MANUAL
BY-PASS

TO
POOL

GATE
VALVE

FILTER

PUMP

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

Figure 3.

FROM
POOL

level. If a manual by-pass is installed, temporarily close it
to insure that all air is purged from the heater.

W A TER CONNECTIONS

The heater requires proper water flow and pressure for its
operation. See Figure 5 for the recommended installation.
The filter pump discharges to the filter , the filter 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 flow exceeds 120 GPM (454 LPM). See
“WATER FLOW RATE” on page 13- T able 1 for setting of
the manual by-pass valve.

Make sure that the outlet plumbing from the heater contains

Main

Drain

Pool

no shut-off valves or other flow restrictions that could prevent
flow through the heater (except for pool installations as noted
below, or winterizing valves where needed). T

o switch flow
between the pool and spa, use a diverter valve. Do not use
any valve that can shut off the flow.

Install the chemical feeder downstream of the heater. Install
a chemical resistant one-way check valve between the heater

From Pool

3-Way

Valve

and the chemical feeder to prevent back-siphoning through
the heater when the pump is off.

NOTICE: If the heater is plumbed in backwards, it will cycle continuously. Make sure piping from filter is not reversed
when installing heater.

Connect the heater directly to 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.

Do not operate the heater while an automatic pool cleaner is also operating. If the circulation pump suction is plugged (for
example by leaves), there may not be adequate flow to the heater. Do not rely on the pressure switch in this case.

3-Way

Valve

Heater

Spa

Figure 5.

Chlorinator

Check Valve

Filter

Pump

3-Way

Valve

MASTERTEMP® Pool and Spa Heater Installation and User’s Guide Rev. M 1-8-15

Section 3. Installation Instructions

13

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.

MANU AL BY-PASS

Where the water flow rate exceeds the maximum 120 GPM, a manual

Figure 4.

bypass should be installed and adjusted. After installing the valve, adjust
the valve to bring the flow rate within the acceptable range. Then remove
the valve handle or lock it in place to avoid tampering. See Figure 4.

wolfdednemmocermumixamehtdeecxetonoD*

Table 1.

Cool water

Warm water out

1. Set Manual By-Pass Valve.

2. Remove Handle.

Outlet to pool

Inlet to heater

ledoM)MPL()MPG(.niM*)MPL()MPG(.xaM

571)67(02)454(021

002)67(02)454(021

052)59(52)454(021

003)411(03)454(021

004)251(04)454(021

.gnipipgnitcennocehtrofetar

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

See page 46 for Pressure Relief Valve Installations.

BELO W POOL LEVEL INST ALLA TION

If the heater is below water level, the pressure switch must be adjusted. This adjustment must be done by a qualified
service technician. See following CAUTION before installation.

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 35, Figure 29.

If the heater is installed more than 5’ above the 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.

Rev. M 1-8-15 MASTERTEMP® Pool and Spa Heater Installation and User’s Guide

CAUTION

FLOW SWITCH

14

Section 3. Installation Instructions

GAS CONNECTIONS

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 15, show which size pipe is required for the distance from the gas meter to
the heater. The table is for natural gas at a specific gravity of .65 and propane at a specific 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 flowing 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 6.
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 15. 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 flame to test the gas line. Use soapy water or another nonflammable method.

NOTE

A manual main shut-off valv e 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 fitting with a capped
nipple in the bottom outlet which can be removed for
cleaning, as illustrated in Figure 6, or an other device
recognized as an effective sediment trap. All gas piping
should be tested after installation in accordance with
local codes.

18–24" of 3/4"
Gas line from
Valve

Union

Sediment
Trap

1" Dia. or larger

(See "Recommended
Pipe Sizes" Chart)

Bell
Reducer

Figure 6.

At least 9"

At least 3"

Manual
Shut-off
Valve

MASTERTEMP® Pool and Spa Heater Installation and User’s Guide Rev. M 1-8-15

Section 3. Installation

15

GAS PIPE SIZING

ST AGE TWO “LOW PRESSURE” GAS PIPE SIZING

SNOITCENNOCENILSAGROFGNIZISEPIP

HTGNELEPIPTNELAVIUQEMUMIXAM

).tF(

tooFcibuCrep.U.T.B0001tasaGlarutaN

tooFcibuCrep.U.T.B0052tasaGenaporP

”2/1”4/3”1”4/1-1”2/1-1”2”2/1-2

TANORPTANORPTANORPTANORPTANORPTANORPTANORP

LEDOM

571-’02’03’08’521’052’054’006 -----­002-’02’03’08’521’052’054’006 -----­052-’01’02’05’07’051’052’005’006 -----

----

Table 2.

003--’01’03’05’001’002’053’004’006
004

--- ’01’02’06’001’051’002’054’004 ---

TESTING GAS PRESSURE

Before operating the heater, the heater and its gas connections must be leak tested. Do NOT use an open flame to test
for leaks. Test all gas connections for leaks with soapy water or another non-flammable method (see page 14).

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

To Air Flow
Switch

Connection

for Service

To Air Flow
Switch

To Gas
Valv e V ent

To Gas
Valve Vent

must be performed by a
qualified installer, service
agency , or the gas supplier.
If this control valve is
replaced, it must be
replaced with an identical
control.

The combination gas

To Low Side of
Differential Pressure Gauge

Pressure Tap

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 orifice as shown in Figure 7.

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.

Ven t

Connection

for Test

To High Side
of Differential
Pressure Gauge

Figure 7.

Pressure Tap
Inlet

Rev. M 1-8-15 MASTERTEMP® Pool and Spa Heater Installation and User’s Guide

16

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

OUTDOOR INST ALLA TION

(U.S. and Canada)

:ETON .gnitareposiretaehelihwnekatebtsumsgnidaerllA

erusserPsaGledoM

telnImumixaM

telnImuminiM

dlofinaM

TM4141
TM4 4
TM1.0±2.0-1.0±2.0-

.smelborpecnamrofrepnitluser

larutaNenaporP

.C.WsehcnI

lliwffosiretaehelihwedamsgnidaerrostnemtsujdaynA

Table 3.

For heaters 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.

T o 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 m ust be set on a level foundation f or 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

8. 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.

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

460738.

Lead
Anchor

MASTERTEMP® Pool and Spa Heater Installation and User’s Guide Rev. M 1-8-15

Section 3. Installation Instructions

17

For minimum exhaust vent clearances for all building openings, including but not limited to vented eaves, doors, windows,
gravity air inle t, see Figure 9, 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.

3 ft. (1 M) or more

Building

Figure 9.

6 in

Exhaust Grill
(Vent)

OUTDOOR INSTALLATION

VENTING GUIDELINES

SIDE VIEW

From building wall

Figure 8.

From window or door

3'

4'

4'

Force

Air Inlet

4'

Property Line

Check local building codes

for setback requirements.

Vent T ermination:

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

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

Rev. M 1-8-15 MASTERTEMP® Pool and Spa Heater Installation and User’s Guide

18

p

.

Section 3. Installation Instructions

INDOOR VENTING — General Requirements

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

V ented 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 20-23.

V ented 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 24-26.

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 18-28. If not, replace the vent system. DO NOT use
a draft hood with this heater.

The MasterTemp heaters are capable of a 270-degree dischar

ge 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 T able 11 on page 21-22.

HEA TER CLEARANCES — General Requirements

INDOOR INSTALLATION (U.S.) OR OUTDOOR SHELTER (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)

For service access, it is advisable to allow for
sufficient clearance on at least one door

anel

6 in.

Note (†) For service access it is advisable to allow for sufficient clearance
on at least one door panel. The heater is design certified by CSA
International for installation on combustible flooring. For installation on
carpeting, the heater must be mounted on a metal or wood panel that
extends at least three inches (10cm) beyond the base of the heater. If the

6 in.*

6 in.*

heater is installed in a closet or alcove, the entire floor 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

6 in.

access. However, the control panel must not be located on the side where
the vent is located.

OUTSIDE VENT COVER REMOVAL

Figure 10.

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 1-8-15

Section 3. Installation Instructions

19

COMBUSTION AIR SUPPLY

For indoor installation, the heater location must provide sufficient 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 (30cm) of the ceiling, the other within 12 inches (30cm) of the
floor 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 insufficient, see “Direct Air Intake Duct
with 3-inch PVC Pipe (Indoor Installation)” below.

Air Supply Requirements Guide

for MasterT emp Heaters

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Ta ble 4.

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

For indoor heater installations where combustion air supply might be insufficient, the MasterT emp® Heater is certified 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 flow. 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 20).

*gninepOhcaErofaerAnepOeerFteNmuminiM

Rev. M 1-8-15 MASTERTEMP® Pool and Spa Heater Installation and User’s Guide

20

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)

Ta ble 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.

Note (*): Combustion Air Intake Duct Connection Kit (Part Number 461031) for all MasterTemp heater models can be
purchased separately. See page 52 for parts list.

NOTE

Each 90-degree elbow reduces the maximum horizontal PVC air intake duct run by 12 feet and each 45­degree elbow in the PVC air intake duct run reduces the maximum run by 6 f eet. See the T able 5 abo ve f o r
the maximum lengths using 90-degree elbows.

Corrosive Vapors and Possible Causes

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saera

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.dicacitairumrocirolhcordyhsahcus

noitcurtsnoc,stnemecdnaseulG

tniapdna,sehsinrav,stniap,sevisehda

dnasexaW.sreppirtshsinravdna

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spaosyrdnualro,stnegreted,sehcaelB

srenaelcdnasexaW.enirolhcgniniatnoc

muidosromuiclac,enirolhcgniniatnoc

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

Table 6.

CAUTION

MASTERTEMP® Pool and Spa Heater Installation and User’s Guide Rev. M 1-8-15

Section 3. Installation Instructions

Com

b

ustio

C

r

V

ent Bod

y

y

C

C

21

VENT INSTALLATION –

(Category I)

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

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

INDOOR INSTALLATION (U.S.) OR OUTDOOR SHELTER (CANADA)

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.

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" 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 11, 12 and 13)

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. T ype
“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 official for detailed information. Do not use a draft hood with this heater .

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

ralloCeulFlateM.oNtraP

"6x46700-70777
"8x47700-70777

hambe

Flue Collar

lean the Interior Surface

lean and RTV

This Surface

4" x 8" Metal
Flue Collar

Figure 11.

Vent Pipe

1. See Table 7, to determine allowable vent sizes for your heater.
NOTICE: Table 7 is for installations in which the total lateral vent length (that is, the horizontal distance from the flue

collar to the main vertical portion of the vent) is less than 1/2 the total vent height (the vertical distance from the flue 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).

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

Table 7.

– Permitted Minimum and Maximum Vent Heights By Size and Heater Model

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.ni8)5.03(.tf001/)8.1(.tf6)5.03(.tf001/)8.1(.tf6)5.03(.tf001/)8.1(.tf6)5.03(.tf001/)8.1(.tf6)5.03(.tf001/)4.2(.tf8

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.ni8.ceRtoN.ceRtoN.ceRtoN)6(.tf02/)8.1(.tf6)6(.tf02/)4.2(.tf8
.ni9.ceRtoN.ceRtoN.ceRtoN.ceRtoN)8.1(.tf6/)8.1(.tf6

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Rev. M 1-8-15 MASTERTEMP® Pool and Spa Heater Installation and User’s Guide

22

Section 3. Installation Instructions

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 f eet. See Table 7 on page 21 for the maximum v ent lengths
using 90-degree and 45-degree elbows.

2. Install the metal Flue Collar in the Vent Body
of the heater (located under the outside vent
cover). Fasten the metal Flue Collar to the V ent
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.

Min. 10 Ft.

6" Minimum
Clearance to
Combustible

Materials

Class B Double Wall

Metal Vent Pipe

Metal Flue

Vent

Body

Collar

Listed
Termination
Cap

Storm Collar

Flashing

Firestop

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

WARNING

Figure 12. – Typical Metal Vent Pipe Installation - U.S.

Risk of fire or asphyxiation if vent is not
assembled according to manufacturer’s
instructions or if vent parts from different
manufacturers are mixed. V ent parts from dif ferent

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 during assembly and installation.

6" (15 cm) Minimum
Clearance to Combustible
Materials

Min. 2 Ft.

(.7 M)

(V ertical – Negative Pressure)

Min. 10 Ft. (3.3 M)

Type B Double Wall

Metal Vent Pipe

Metal Flue

Vent
Body

Collar

Condensate
Drain w/trap

Listed
Termination
Cap

Storm Collar

Flashing

Firestop

Type B Double Wall

Metal Vent Tee

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

MASTERTEMP® Pool and Spa Heater Installation and User’s Guide Rev. M 1-8-15

Figure 13. – Typical Metal V ent Pipe Installation - Canada

(V ertical – 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 fire stop for floor and ceiling penetrations. Use Listed thimble for wall penetrations. Use a Listed roof
flashing, roof jack, or roof thimble for all roof penetrations. Do not fill the space around the vent (that is, the clear air
space in the thimble or fire 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.

23

WARNING

Fire Hazard. Do not vent the heater directly into a masonry chimney. Installation into a masonry chimney must 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.

WARNING

Risk of fire, carbon monoxide poisoning, or asphyxiation. It is recommended to use a CO Monitor and Fire Alarm in rooms
that contain gas fired appliances.

Rev. M 1-8-15 MASTERTEMP® Pool and Spa Heater Installation and User’s Guide

24

Section 3. Installation Instructions

HORIZONTAL OR VERTICAL VENTING

- POSITIVE PRESSURE

(See Figures 14, 15, and 16 )

(Category III)

V ent 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.

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 Tab le 8 below for the maximum vent lengths using 90° elbows.

The MasterTemp heater is a “Category III” appliance (which

Table 8.

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 flue 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

0)M3.12(.tf07

2)M0.41(.tf64

3)M4.01(.tf43

swoblE°09fo.oN)M(teeFnihtgneLmumixaM

1)M7.71(.tf85

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

*

4)M7.6(.tf22

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 19, for heater ventilation air requirements. It is

.niardotetasnednoc

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.

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

CAUTION

Each 90° elbow

)latnoziroHrolacitreV(tneVsaGlaicepS.ni4

*

ecnadroccaniro,)M43.(toofenosihtgneltnevmuminiM
dnalacoldna,noitcurtsnis’rerutcafunamtnevhtiw
htgnelnisselro)M1(’3stnevlatnoziroH.sedoclanoitan
nwodepolstsumtub,eetetasnednocaeriuqertonod

wollaot)M/mc2(toofehtot”4/1tateltuoehtdrawot

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.

3. Install the Appliance Adapter in the Vent Body of the heater (located under the outside Vent Cover). Before connecting
the Appliance Adapter to the V ent 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 specified by the vent manufacturer, following the vent manufacturer’ s instructions.

MASTERTEMP® Pool and Spa Heater Installation and User’s Guide Rev. M 1-8-15

Section 3. Installation Instructions

25

WARNING

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.

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 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 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” firestop for floor and ceiling

penetrations. Use an “Approved” thimble for wall
penetrations. Use an “Approved” roof flashing, roof jack,
or roof thimble for all roof penetrations. Do not fill the
space around the vent (that is, the clear air space in the
thimble or firestop) with insulation. The roof opening must
be located so that the vent is vertical.

6. Vent Termination – Vertical (See Figures 14 and 15),

for height of vent termination above the roof. Use an
“Approved” vent terminal specified 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.

Vent Cap and
Riser Furnished
by Installer

Side

Wall V ent

Vent Cap and
Riser Furnished
by Installer

Chimney or Gas Vent

Heater

Chimney or Gas Vent

Outlet Air
Opening

Inlet Air
Opening

Figure 14.

Outlet Air Opening

7. Make sure entire installation is sealed according to
approved standard.

Rev. M 1-8-15 MASTERTEMP® Pool and Spa Heater Installation and User’s Guide

Side

Wall V ent

Heater

Inlet Air Opening

Figure 15.

26

Section 3. Installation Instructions

Max. 12"
Min. 3"

Vent
Terminatio

At least 7'
above grade
adjacent
to public
walkways

Figure 16.

Vent
Termination

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

Forced Air
Inlet

4' Min.

4' Min.

4' Min.

Gas Meter

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

4' Min.

Vent
Terminatio

n

1' Min.

8. Vent Termination – Horizontal
The terminal must be located (U.S. – See Figure 16):

• at least 3" and at most 12" out from the wall (see Figure 17), following the vent manufacturer

’s instructions

• at least 12" above finished 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 traffic areas

The terminal must be located (Canada – See Figure 16):

n

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

•

• at least 12" (.3M) above finished 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 traffic 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. T o 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.

MASTERTEMP® Pool and Spa Heater Installation and User’s Guide Rev. M 1-8-15

Metal
Vent
Body

Metal Special
Gas Vent
requires
Appliance
Adapter

Condensate
drain w/Trap

(Optional)

Support
weight
of pipe

Condensate
Tee

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

Listed
Termina

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

l

e

Figure 17.

Section 3. Installation Instructions

27

OUTDOOR SHEL TER INST ALLA TION

In Canada, this pool heater can only be installed outdoors or in an enclosure that is not normally occupied and has no direct
openings into occupied areas.

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 certified by CSA International for installation on combustible flooring; 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 floor,
see Figure 18. 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 19).
Choose a location that will avoid contamination by chemical fumes.

CAUTION

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

NOTICE: Combustion air contaminated by corrosive chemical fumes can
damage the heater and will void the warranty (See Table 6, page 20).

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

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

Rev. M 1-8-15 MASTERTEMP® Pool and Spa Heater Installation and User’s Guide

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

to avoid flammable vapors

18 in.

Figure 18.

28

s

CONTROL PANEL INDEXING

Section 3. Installation Instructions

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 19.

Top Panel

Door
Acces
Panel

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.

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

3.

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

Door
Access Panel

wires caught under the panel.

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

Figure 19.

6. Reattach the door access panels.

FINAL INSTALLATION CHECK

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.

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,

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

460738.

(See Florida Building Code 301.13).

Lead
Anchor

MASTERTEMP® Pool and Spa Heater Installation and User’s Guide Rev. M 1-8-15

Section 3. Installation Instructions

29

ELECTRICAL CONNECTIONS

Electrical Rating: 60 Hz 120 / 240 V olts AC, single phase

Enclose the incoming AC power line to the heater , in an approved flexible conduit connected directly to the junction box
on the inside of the access door panel. Line voltage field wiring should be 14 gauge, with a circuit capacity of 15 Amps.

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.

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 pages 38 and 42 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
field, must be “Type T” wire rated for 35°C rise.

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

6. The filter 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 filter 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)

Rev. M 1-8-15 MASTERTEMP® Pool and Spa Heater Installation and User’s Guide

AC Plug
120 Volt

or

240 Volt

Figure 20.

30

Section 3. Installation Instructions

CONNECTION OF FIREMAN’S SWITCH OR REMOTE CONTACT

CAUTION

If, while there is line voltage connected to the heater, you touch either line voltage terminal with any 24VAC wire that
is connected to the control board (including the Fireman’s Switch jumper), you will immediately destroy the control
board and void the warranty.

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 21).
4a. T

o connect a 2-Wir

e Control (such as Pentair’s IntelliT ouch

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 22). 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-W

ire Control:

- Connect wires between the control board terminals

on the heater and the external relays, as shown in

Figure 23. 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 23) to enable

external control and to disable the heater membrane
pad’s “Pool ON” and “Spa ON” buttons (the “OFF”
key on the membrane pad remains functional).

Knock-outs are provided to route the wires through

-

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

5.

Close control box cover.

6. Re-install the access door panels.
T o 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 flow 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, which is commonly available.

Figure 22.

®

or EasyT ouch® Control

TRANS

TH

IND

VAL

GND

BK

OPERATING CONTROL

O

ENABLE TOGGL
DISABLE TOGGLE

FS

24VAC

24VAC

E

TERMINAL BOARD

L1

F1

L1

GND

R

G

BK

L1

L2

24VAC

GROUND (GND )

12 Pin

Receptacle

THERMISTOR

MEMBRANE PAD

CONNECTION

F
I
R
E

FL

M

A
N
S

BOX

JUNCTION

Figure 21.

BK

O

Y
Y

YY

J6

1

9

FUSE

TRANS

S

W

I

L2

T
C
H

BM

L2

Time Clock or Remote

(Purchase Separately –

24VAC

W

FUSE

TRANS

W

W

R

R

Supplies Power to

Circulator Pump)

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

MASTERTEMP® Pool and Spa Heater Installation and User’s Guide Rev. M 1-8-15

Section 3. Installation Instructions

MASTERTEMP HEA TER WIRING DIA GRAM

(3-WIRE SYSTEM)

CONNECTION DIAGRAM

AGS Switch
Stack Flue Sensor

Gas Valve

O

O

BL

W

W

Y/W

Y

BL

R

R

External Control Interface Circuit Disabled,
Heater Membrane Pad Enabled

JMP

1

Air Flow Switch
Extra Switch 1

Hi-Limit Switch
Pressure Switch

O

O

PR

PR

PS
HLS

ES1

AFS

AGS
SFS

GAS

OPERATING CONTROL

JMP3

1

External Control Interface

VAL

Spa Line

W

BK

TH

IND

GND

24VAC

24VAC

Common Line

FS

MEMBRANE PAD
CONNECTION

Pool Line

Y/R

Y/BL

Y/O

Y/W

Y

Y
Y
Y
Y

BR
BR

J6

THERMISTOR

NA/LP
Models Only

1

6

Y

31

Y/BL

Y/W

Y/R

Y/O

YYYYY

JMP

1

External Control Interface Circuit
Enabled, "Pool On" and "Spa On"
Keys Disabled. "OFF" Key on
Membrane Pad Remains Functional

Plug –12 pin

120V – Black
240V – Red

1

12 Position
Receptacle

JUNCTION BOX

Line 1

Line 2

Ground

BK

R

G

GND

24

F1 F2

VAC

DIAGNOSTIC INDICATOR

IGNITION CONTROL

MODULE

S1

S1/

L1

120

L2S2TH IND

240

.

GYGYBK

GY

120 VAC

IGNITER

BK

O

GY

GY

R

W

BK

Y

BL

GY

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.

W

VAL G ND

Y/W

GND

YY

24VAC

SEC

Y/W

Y/O

Y/BL

Y/R

F
I

BK

BK

BK

W

R

BK

Y

BL

G

GND

L1

F1

R

BLOWER

R
E

FL

M
A
N
S

Y

BK

S

W

I
T
C
H

W

O

W

TRANS

L2

BM

RRW

Replace jumper with

leads to Fireman"s

Switch (field installed)

Figure 23.

Rev. M 1-8-15 MASTERTEMP® Pool and Spa Heater Installation and User’s Guide

32

Section 3. Installation Instructions

MASTERTEMP HEA TER ELECTRICAL SCHEMA TIC LADDER DIA GRAM

LADDER DIAGRAM

L1 L2

L1 S1 S2 L2

240

VAC

IGNITER

F1 F2

24 VAC

24V

COM NO

WATER

PRESSURE

SWITCH

240

VAC

24 VAC

OPERATING

CONTROL

24 VAC

LOGIC

HI
LIMIT
SWITCH

BLOWER

GND

CLASS II

TRANSFORMER

GND

AIR

FLOW

SWITCH

IND

TH

VAL

THERMISTOR

SENSOR

NOTES:

1.)

ARE CONNECTED ON THE IGNITION MODULE.

2. )

3. )

MASTERTEMP® Pool and Spa Heater Installation and User’s Guide Rev. M 1-8-15

AGS

SWITCH

INLET TEMPERA TURE

CONTROL SWITCH

STACK FLUE

SENSOR

GAS VALVE

L1 L2 F1 F2 S1 24 VAC

S2 GND IND VAL

AND TH

PIN AND SOCKET CONNECTOR.
IF ANY OF THE ORIGINAL WIRES AS SUPPLIED

WITH THE APPLIANCE MUST BE REPLACED,
THEY MUST BE REPLACED WITH TYPE 105° C
OR ITS EQUIVALENT.

Figure 24.

Section 4. Operation Instructions

33

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 filled 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 floor
because some gas is heavier than air and will settle on
the floor.

WHAT TO DO IF YOU SMELL GAS

– Do not try to light any appliance.
– Do not touch any electrical switch; do not use any phone

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 qualified
service technician. Forced or attempted repair may result
in a fire or explosion.

D. 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 the control system
and any gas control which has been under water.

E. Do not operate the pool heater unless the pool or spa is

properly filled with water.

F. Before operating the appliance for the first time or after

it has been off for an extended time, perform the
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,
flammable liquids and chemicals.

3. Check that all water connections are tight.

4. Water must be flowing through the heater during
operation. Make sure that pool/spa is filled with water
and have pump operating. Check that water flow is
unobstructed from the appliance. When operating for
the first time or after an extended shut-down, run
filter pump for several minutes to clear all air from
the system.

Rev. M 1-8-15 MASTERTEMP® Pool and Spa Heater Installation and User’s Guide

34

OPERA TING INSTRUCTIONS

Section 4. Operation Instructions

1. STOP! Read the safety information on (page 33).

2. Set both pool and spa thermostats to the lowest settings.

Water
Pressure
Switch

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 25.

6. T

oggle-Style V

7. Wait five (5) minutes to clear out any gas. If you then smell gas, ST

alve: Pull toggle toward you to turn gas off , see Figure 26.

OP!

Figure 25.

Follow “B” in the “Before Start-up” instructions (page 33). If you don’t smell
gas, go to the next step.

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

9. Replace the Door

Access Panels. All panels must be in place when operating

the heater.

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

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

1 1 . Turn on all electric power to the appliance.

12. Press either the POOL ON or SP A ON button switch on the operating control.

13. Set the thermostat to desired setting (NOTICE: Setpoint must be above
actual water temperature or burner will not fire). See “OPERATING the
CONTROL PANEL”.

You

are

here.

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

Figure 26.

15. The burner should fire until the pool/spa temperature reaches the desired temperature set on the thermostat. The
blower will continue to run for about 45 seconds after the burner shuts off. If any of the safety interlocks should open
during burner operation, the burner shuts off immediately, but the blower continues to run for about 45 seconds.
Should overheating occur or the gas supply fail to shut off, turn off the manual gas control valve to the appliance.

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 25.

4. T

oggle-Style V

5. Replace the Access Door Panels.

MASTERTEMP® Pool and Spa Heater Installation and User’s Guide Rev. M 1-8-15

alve: Pull toggle toward you to turn gas off, see Figure 26.

Section 4. Operation Instructions

SAFETY CONTROLS

AIR FLOW SWITCH (AFS)

The air flow switch, (see Figure 27), is a safety device used to insure that the
combustion air blower (fan) is operating and has been designed to monitor the
vacuum (negative) pressure within the blower housing. The air flow switch is
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

35

Figure 27.

Air Flow Switch

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

The water pressure switch, (see Figure 28). If the water flow is restricted, the
water pressure switch may prevent the burner from firing and cause the “Service
System” light to go on. If the light remains on after the filter has been serviced,
have a qualified service technician check the system.

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

3.00 psi (20.6 kPa). NOTE: See, Below Pool Level Installation I nstructions on

page 13. 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 29. T est the switch after resetting.

NOTICE: When the heater is mounted more than five 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

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

with no water flow. Operation of the heater
without sufficient water flow may severely
damage it.

Water
Pressure
Switch

Figure 28.

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.

Rev. M 1-8-15 MASTERTEMP® Pool and Spa Heater Installation and User’s Guide

A reference scale is on
the back of pressure switch

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

Star Wheel

Figure 29.

36

Section 4. Operation Instructions

SAFETY CONTROLS, (cont’d.)

OPERATION OF IGNITION MODULE

The Ignition Module, (see Figure 30), 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 flame holder. The module
with the presence of the flame sensor, using flame rectification,
allows the heater to operate.

OPERATING THE CONTROL PANEL

The five operating switches are:
POOL ON Press this button to govern heater operation by

the pool temperature setting.

SPA ON Press this button to govern heater operation by

the spa temperature setting.

HEATER OFF Press this button to switch off the heater.



 TEMP Press this button to raise the temperature



setting.

Flame Current

Check Point

Diagnostic LED

1 Flash - Air Flow Fault
2 Flashes - Flame No Call for Heat
3 Flashes - Ignition Lockout

Figure 30.

Temperature

Up and Down

Digital T emperature

Display



 TEMP Press this button to lower the temperature



setting.

System Operation

Indicator Lights

Dual T emperature

Controls

Heater "OFF"

Switch

T o toggle the display between degrees Centigrade (°C) and degrees
Fahrenheit (°F):

Figure 31.

1. Turn the Operating Control OFF.

2. Press TEMP or  TEMP for 5 seconds. The display will flash once and change modes (°C to °F or vice versa).

3. Turn the Operating Control ON.
When either the TEMP or  TEMP buttons are depressed, the digital display will indicate the temperature setting.
After five seconds, the display will return to the actual pool/spa temperature.

In addition to the digital temperature display, there are five indicator lights:
The POOL ON light indicates that the pool water temperature is governing operation of the heater.

The SPA ON light indicates that the spa water temperature is governing operation of the heater.
The HEATING light comes on and stays on when the burner is firing. This light should be on whenever the burner is on.

It blinks when the heater is calling for heat but not firing. If this light is on but the burner fails to come on, one of the
“service” lights should come on, indicating a fault in the system.

The SER VICE SYSTEM light indicates that there is insufficient water flow to the heater. If the pump is operating, this
usually indicates that the filter and/or skimmers should be cleaned (some filters may require back-washing). If the light
remains on after the filter/skimmers have been serviced, the system should be checked by a qualified service technician.

The SER VICE HEATER light indicates a fault in the heater or its controls. If this light comes on, shut down the heater
(See “TO TURN OFF GAS TO THE APPLIANCE” on page 34), and have a qualified service technician check the
system.

Risk of explosion or fire causing burns or death if safety interlocks are disabled. DO NOT attempt to operate heater
when SERVICE HEATER light is on or if blower or burner will not start. Instead, follow instructions under “To Switch Off Gas to
the Appliance,” and call a qualified service technician to repair unit.

MASTERTEMP® Pool and Spa Heater Installation and User’s Guide Rev. M 1-8-15

WARNING

Section 4. Operation Instructions

Door
Access
Panel

Top Panel

Door
Access Panel

37

TEMPERA TURE SETTING

The 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 . If you desire to heat only one
body of water, the thermostat is capable of an off mode. As an example, if you only wish to heat the spa and not the pool,
simply depress and hold the pool down arrow, and the thermostat will lower its setting to 65° F. then go to an off mode.

MAXIMUM TEMPERA TURE SET POINT

1. Unbolt and remove the door panels (see Figure 32).

2. Access the control panel board on the underside of the top cover. Locate

the yellow button on the corner of the control board.

3. Push the Max. Temp. Set Point button on the back of the control

board (see Figure 33).

The following sequence should happen:

A. The unit will come on and the POOL ON
B. Press the

TEMP or  TEMP pad (on TOP of the panel) to set

light will come on.

maximum pool temperature.

C. Wait up to 30 seconds; the POOL ON light will go off and the

SPA ON light will come on. To override the time delay, push the
Max. Temp. Set P oint button again.

D. Press the

TEMP or  TEMP button on the control panel

and set maximum spa temperature to 104°F (40°C) or less.

E. Wait up to 30 seconds; the SPA ON light will go off and

the unit will shut down. T o override the time delay, push
the Max. Temp. Set Point button again.

4. Reinstall the access door panels.

MA

SET

MAX

S1

Figure 32.

SET

S1

X

Figure 33.

Rev. M 1-8-15 MASTERTEMP® Pool and Spa Heater Installation and User’s Guide

Section 5. Troubleshooting

38

Troubleshooting Instruction

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 trans­former, 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

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.

Is green “POOL” or “SPA”
LED “on”?

YES

Is red “SERVICE SYSTEM”
LED “on”?

NO

Is red “SERVICE HEATER”
LED “on”?

NO

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

Do any diagnostic LED’s on
back of board (AGS, AFS,
SFS, HLS, PS, or
THERMISTOR) come “on”
and stay on?

NOTICE: Any or all of the diag­nostic LED’s may come “on”
momentarily when you turn on
the power to the heater.

YES

YES

NO

NO

YES

Are any red diagnos­tic LED’s on back of
board (AGS, AFS,
SFS, HLS, PS or
THERMISTOR) “on”

NO

Does red “SERVICE
HEATER” LED come
“on”

NO

YES

YES

Go to chart “HEATER WILL
NOT FIRE - A”
(Page 39)

Go to chart “HEATER WILL
NOT FIRE - B”
(Page 40)

Go to specific safety switch
troubleshooting chart
(Pages 43 and 44)

Go to chart ‘HEATER WILL
NOT FIRE -C”
(Page 41)

Verify that water temperature setting is
above water temperature reading. If it is,
and heater either will not fire or no red
LED’s come “on”, replace Control Board.

WARNING WARNING

Disconnect power before servicing any components.

MASTERTEMP® Pool and Spa Heater Installation and User’s Guide Rev. M 1-8-15

Hazardous voltage. Can shock, burn or kill.

Fire and Explosion hazard.

switch terminals to remedy a failed safety switch.

Do not jumper

Section 5. Troubleshooting

Heater Will Not Fire - A
Start

39

Is green “SPA” or
“POOL” LED “on”

YES

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

NO

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-C and

-D”, Pages 41 and 42).
Check fuse and all
other 24V components
for damage.

NO

YES

YES

YES

Depress “POOL” or “SPA” ON
button on Membrane Pad.
Does “POOL” or “SPA” LED
come on?

NO

Check for line voltage to
heater.

Check for 24 VAC at sec­ondary of Transformer.

NO

Check for Line Voltage
between L1 and L2 terminals
on Terminal Board.

YES

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.

YES

NO

NO

NO

YES

Heater should fire on demand
for heat.

Restore power to heater.

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.

Replace Transformer.

YES

NO

GO TO
“HEATER WILL NOT FIRE - B”
Page 40

Jumper Fireman’s Switch at
Terminal Board and depress
“POOL” or “SPA” ON button on
membrane pad. Does “SPA” or
“POOL” LED come “on”?

NO

Leaving jumper in place,
check for 24 VAC between
Fireman’s Switch terminals
and ground.

Remove jumper. Check ribbon
cable connection between
Membrane Pad and J6 on
Control Board. Depress
“POOL” or “SPA” On pad
again. Does “POOL” or “SPA”
LED come on?

Jumper pins 6 and 5 on J6 of
Control Board. Does “SPA”
LED come on?
Jumper pins 6 and 4 on J6 of
Control Board. Does “POOL”
LED come on?

YES

NO

YES

YES

NO

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.

Heater should fire on
demand for heat.

Replace Membrane Pad.

Replace Control Board.

Rev. M 1-8-15 MASTERTEMP® Pool and Spa Heater Installation and User’s Guide

40

Heater Will Not Fire - B
Start

Section 5. Troubleshooting

Is red “SERVICE
HEATER” LED “on”

YES

NO

CONTINUE

Is red “SERVICE SYSTEM”
LED on?

YES

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

YES

With pump running, adjust
Water Pressure Switch to
lower pressure until ‘SER­VICE SYSTEM” LED goes
out. Then verify that “SER­VICE SYSTEM” LED goes on
with pump off.

NO

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

YES

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

NO

NO

NO

YES

Increase POOL/SPA tempera­ture setting on Membrane
Pad above actual water tem­perature. Heater should fire
on demand for heat. If not,
and no other red LED’s light,
replace Control Board.

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

175 20 gal/min (76 LPM)
200 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.

Minimum Flow Requirements

MASTERTEMP® Pool and Spa Heater Installation and User’s Guide Rev. M 1-8-15

Check whether any of the
red diagnostic LED’s on back
of board (AGS, AFS, SFS,
HLS or PS) are “on”

NO

GO TO

“HEATER WILL NOT FIRE - C”

Page 41

YES

Model Flow

175 20 gal/min (76 LPM)
200 20 gal/min (76 LPM)
250 25 gal/min (95 LPM)
300 30 gal/min (114 LPM)
400 40 gal/min (151 LPM)

Go to “Diagnostic LED’s”,
(Pages 43 and 44)

Section 5. Troubleshooting

Heater Will Not Fire - C
Start

41

Is “SERVICE HEATER” LED
“on”?

YES

If any red diagnostic LED’s
(AGS, AFS, SFS, HLS, PS, or
THERMISTOR) come “on”, go
to to Pages 43 and 44.

CONTINUE

Did burner fire at all?

YES

Go to “BURNER
TROUBLESHOOTING”
(Page 44)

Go to “HEATER WILL NOT
FIRE-D” (Page 42)

Replace Ignition Control
Module.

NO

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.

NO

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

YES

NO

NO

YES

YES

NO

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

Does heater fire and
stay on?

Did Blower come on?

YES

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).

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

NO

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

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

NO

Replace Control
Board.

NO

YES

NO

NO

YES

YES

Go to “INITIAL
TROUBLESHOOTING”

Continue to observe heater
for several minutes. Cycle
heater on and off several
times. Observe for delayed or
rough ignition, poor combus­tion, premature extinction of
flame, evidence of boiling, or
operation of any diagnostic
LED. Go to pertinent trou­bleshooting section if any
malfunction is observed.

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

NO

Valve terminals during ignition
try. (Voltage appears about 24
seconds after call for heat).
SEE NOTE 2.

YES

Replace Gas Valve with
identical part.

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

Replace 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.

Rev. M 1-8-15 MASTERTEMP® Pool and Spa Heater Installation and User’s Guide

42

Heater Will Not Fire - D

IMPORTANT! READ ME FIRST!

IMPORT ANT! READ ME FIRST! !

If your heater is correctly connected to 240 Volts AC, the
Ignition Control Module (ICM) will convert the 240VAC to
an intermittent pulse to the ignitor. Digital meters don’t read
this type of signal well. (An analog meter will give a better
reading than a digital meter). If the ICM is bad, your volt-

Start

Section 5. Troubleshooting

meter will read either 0 VAC or 240 VAC. If your ICM is
good, your meter will read some voltage between 0 and

240 VAC. Exactly what reading you get will depend on the
meter, but with a good ICM, the reading won’t be 0 VAC or
240 VAC, but somewhere in between.

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

YES

Check voltage across
igniter leads; OK?

NO

Replace Ignition
Control Module. On a
120 V installation,
check the ignitor for
damage if it has seen
240 VAC.

NO

YES

Go back to chart “HEATER WILL
NOT FIRE-C” (Page 41).

Check gas pressure. OK?.

NO

Increase gas flow into heater:

• Replace gas line with larger
line;

• Replace regulator;

• Replace meter; or

• All of the above.

YES

Replace HSI Igniter.

MASTERTEMP® Pool and Spa Heater Installation and User’s Guide Rev. M 1-8-15

Section 5. Troubleshooting

Diagnostic LED's: AGS, AFS, HLS, PS, THERMISTOR

43

AGS or HLS "on"

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

CONTINUE

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

YES

PS "on"

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

CONTINUE

AFS "on"

Replace Blower.

Verify that wires BM
and F1 are correctly
connected at the
terminal strip (see
Heater Connection
Diagram, Page 30).

YES

YES

YES

NO

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

YES

Verify that inlet water temper­ature is below 104° F.

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

YES

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

Does Blower operate?

NO

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

NO

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

NO

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

NO

NO

NO

YES

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.

Service pump and filter to
restore proper flow.

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 18.

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.

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

YES

NO

NO

NO

THERMISTOR "on"

CAUTION

remedy a failed switch.

Rev. M 1-8-15 MASTERTEMP® Pool and Spa Heater Installation and User’s Guide

Do not jumper a safety switch to

Connect correctly and retry.
Does Blower start?

Replace Blower. Does Blower
start on ignition try?

Replace Ignition Control
Module.

Verify Thermistor wiring. If
OK, replace Thermistor.

NOTE: ES1 is a spare and should be jumpered.

44

Diagnostic LED's: SFS

SFS "on"

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

NO

Heater starts after several

tries, exhaust temperature
stays below 250˚.

OR

Heater doesn’t start at all

(exhaust stays cold).

Check pressure and volume

of fuel

supply

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

Check continuity in wiring
harness between Control
Board and Probe.

YES

Continuity

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

Clean/tighten pins as
needed.

Reset power to Heater
and retry. Heater should
fire.

OK?

YES

NO

YE

S

DONE

OK?

NO

YES

YES

NOT OK

NO

NO

Check Heat Exchanger
Coil for leaks, liming, soot,
or low flo

Check Thermal
Regulator: Open at
120˚?

Correct problem;
Heater should fire

Check Thermal-Regulator:
Seats

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

Replace Stack Flue Sensor

Reset power to Heater and
retry. Heater should

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

Does the Digital
Temperature Display show
Error Code “E05” or “E06”

correctly?

NO

DONE

NO

YE

w.

YES

NO

NO

S

YES

.

.

fire.

?

NO

NO

(Basic)

NO

(HD )

Section 5. Troubleshooting

Replace Heater
Membrane

Replace Heater
Control

Reset power to Heater and
retry. Heater should

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

Replace Heater Control Board.

Reset power to Heater and
retry. Heater should

Replace Heater Membrane Pad.

Reset power to Heater and
retry. Heater should

Pad.

DONE

Board.

DONE

fire.

NO

.

DONE

fire.

NO

DONE

fire.

MASTERTEMP® Pool and Spa Heater Installation and User’s Guide Rev. M 1-8-15

Section 5. Troubleshooting

Burner Troubleshooting

SYMPTOM CAUSE REMEDY

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

and blower inlet .
See page 15 and verify that t he gas

regulator setting is –0.2" (–0.5cm) wc.

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

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 m ay f ail
to stay lit .

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

ignition.
Combustion appears Flame current is not Check for wet or damaged igniter with

normal, but flame does being sensed.
not stay lit.

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

number of elbows.

low resistance to ground. Replacewith
new igniter.

Veri fy burner flameholder is properly
grounded.

45

Replace

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

“bumping” sounds.

Sweating. Thermal governor failed. t hermal g overnor.

Heat exchanger plugged. Service

Bypass valve stuck open. Service bypass valve.
Thermal governor stuck Replace

closed.

Service

heat exchanger. Correct water

chemistry.

t hermal g overnor.

Replace

Rev. M 1-8-15 MASTERTEMP® Pool and Spa Heater Installation and User’s Guide

46

Section 6. Maintenance

Maintenance Instructions

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 flow 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 flammable
vapors and corrosive liquids.

3. T est 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 35) for testing
instructions).

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

page 28. Check for evidence of joint leakage. Make sure that joints have not slipped partially or completely apart.

Check pipe and fittings for cracks or breaks. The combustion air blower is permanently lubricated, and does not
require periodic lubrication.
service technician if you suspect that the burner may require maintenance.

The burner does not require maintenance or adjustment by the user. Call a qualified

PRESSURE RELIEF VAL VE (NO T FACT ORY INST ALLED)

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 Fig. 34 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.

(PRV)

Drill through the NPT Port, then
use a 3/4" x 2-1/2 Brass Nipple
and Elbow (user supplied) for a
PRV Installation.

3/4” x 1-3/8” Brass Nipple
(22.86 cm x 38.00 cm)

Figure 34.

Explosion hazard. Any heater installed with restrictive devices in the piping system downstream from the heater, (including
check valves, isolation valves, flow nozzles, or therapeutic pool valving), must have a relief valve installed as described above.

MASTERTEMP® Pool and Spa Heater Installation and User’s Guide Rev. M 1-8-15

WARNING

Section 6. Maintenance

47

AFTER ST ART-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 34, 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 flow to the appliance. Make sure that the filter 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 fitting 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 W ater 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.
To return the heater to service after winterizing:

1 . Close drain cock and fittings.

2. Before starting the heater, circulate water through the heater for several minutes until all air noises stop. See also “BEFORE
ST ART-UP” (page 33) and “CARE AND MAINTENANCE” (page 46).

(See additional notes under Important Notices in Introduction.)

Rev. M 1-8-15 MASTERTEMP® Pool and Spa Heater Installation and User’s Guide

48

Section 6. Maintenance

MAINTAINING POOL TEMPERATURE

T o 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 filtering 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 filter 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 specifically for your spa or pool and will give you many years of trouble-free service,
provided you keep your water chemistry in proper condition.

W ater 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 dif ferential. 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

T wo 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.

WHAT IS A DISINFECTANT RESIDUAL?

When you add chlorine or bromine to the pool water, a portion of the disinfectant will be consumed in the process of
destroying bacteria, algae and other oxidizable materials. The disinfectant remaining is called chlorine residual or bromine
residual. You can determine the disinfectant residual of your pool water with a reliable test kit, available from your local
pool supply store.

Y ou must maintain a disinfectant residual level adequate enough to assure a continuous kill of bacteria or virus introduced
into pool water by swimmers, through the air, from dust, rain or other sources.

MASTERTEMP® Pool and Spa Heater Installation and User’s Guide Rev. M 1-8-15

Section 6. Maintenance

49

CHEMICAL BALANCE, (cont’d.)

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.

RULE: 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 fixtures in the filtration 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 filter, the alum used as a filter aid may dissolve and pass through the filter .

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.

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

ALKALINITY High or Low:

"T otal 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. Y ou 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 No ne 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 15 0 200-400 500-1,000
Heavy Metals No n e N o n e No n e

Biological Values

Algae Non e N one None
Bacteria No ne None Refer to Local Cod

*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.

Ta ble 9.

e

Rev. M 1-8-15 MASTERTEMP® Pool and Spa Heater Installation and User’s Guide

Section 6. Maintenance/Replacement P arts

50

MASTERTEMP HEATER REPLACEMENT PARTS

1

For complete
Electrical System
parts breakdown
(Key Nos. 1 through 4),
See Page 53

For complete
Burner System

3

2

5

parts breakdown
(Key Nos. 5 through 7),
See Page 51

For complete
Water System
parts breakdown
(Key Nos. 8 through 9),
see Page 52

7

6

9

4

8

Repair Parts are available from your Pentair dealer.

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

MASTERTEMP® Pool and Spa Heater Installation and User’s Guide Rev. M 1-8-15

Section 6. Maintenance/Replacement Parts

MASTERTEMP HEATER REPLACEMENT PARTS

51

CLAMP LID TUB DESIGN

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 52)

Lid Nut/Washer (9x)

Combustion
Chamber
Gasket

Rev. M 1-8-15 MASTERTEMP® Pool and Spa Heater Installation and User’s Guide

Section 6. Maintenance/Replacement P arts

52

MASTERTEMP HEATER REPLACEMENT PARTS

REPAIR PARTS – BURNER SYSTEM

Model

Key Part 200NA 250NA 300NA 400NA

No. Description

1 Combination Gas Control Valve Kit 42001-0051S 42001-0051S 42001-0051S 42001-0051S
2 3/4" Union
3 Gas Orifice
4 Gas Orifice O-Ring

Qty.

1
2
1
1

• Gas Orifice Kit – NG (Incl. Key Nos. 3 and 4)† 77707-0431 460739 460753 77707-0411

• Gas Orifice Kit – Propane (Incl. Key Nos. 3 and 4)† 77707-0461 460740 460754 77707-0441

• NG to Propane Conversion Kit
(Incl. Key Nos. 3 and 4)† 77707-1461 460741 460755 77707-1441

• Propane to NG Conversion Kit
(Incl. Key Nos. 3 and 4)† 77707-1431 460742 460756 77707-1411

5 Air Blower Kit

Natural Gas Units 77707-0251 460743 460757 77707-0253
Propane Units 77707-0254 460744 460758 77707-0256

• Air Orifice Kit (Includes Key Nos. 6 and 7) 77707-0111 460745 460759 77707-0113

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

1
1
1
1
1

• Blower/Adapter Plate Gasket Kit
(Includes Key Nos. 8, 9, 10, 12) 77707-0011 77707-0011 77707-0011 77707-0011

1

• Flameholder Kit (Includes
Key Nos. 10, 11, 12, 13 and on 300 &400
models only - Flameholder Insert) 77707-0202 460746 77707-0203 77707-0204

8 Blower/Adapter Plate Gasket
9 Blower 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

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

16 Bottom Outer Insulation Blanket*
17 1" Bottom Inner Insulation
18 1" Top Insulation
19 Top Outer Insulation Blanket*

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

20 One Piece Metal Elbow/Combustion Chamber

Cover Assembly 474094

474958

•

Combustion Chamber O-Ring Kit

474952

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

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

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

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

23
24 Side Panel {Manifold} 42002-0033 42002-0033 42002-0033 42002-0033

Heater Bottom 42002-0031 42002-0031 42002-0031 42002-0031

25
26

Side Panel {Flue Stack} 42002-0032 42002-0032 42002-0032 42002-0032

27 J-Box Cover 42002-0041 42002-0041 42002-0041 42002-0041
28 Screw Kit, Panel

Combustion Air Intake Duct Connection Kit

•

*

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.

For heater manufactured AFTER 10/31/2013 (New 9-bolt lid tub design)



For heater manufactured BEFORE 1/12/2009



1
1
1
1
1
1
1
1
1

1

1

77707-0008 77707-0008 77707-0008 77707-0008

1
1
1
1
1

1

1

1
1

1
1
1

1
1
1
1

175NA
175LP

200LP 250LP 300LP 400LP

42001-0051S
38404-4097S

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

460794
460795

460794

460795

77707-0251
77707-0254

460798

42001-0114S

77707-0011

77707-0202

474095





474957
42001-0200S

474095

474957 474957





42001-0200S



42001-0200S

474095







474095



474957

474957



42001-0200S



42001-0200S

77707-0008

42001-0074S



474094



474094





474094



42001-0214S

474958 474958 474958 474958



474201 474201 474201



42001-0214S

474952 474952 474952 474952



42001-0214S





42001-0214S

42001-0214S
474201

474094





474201

42002-0005S
42001-0214S
42002-0034Z

42002-0039
42002-0033
42002-0031
42002-0032
42002-0041
474292

474292 474292 474292 474292

4610311 461031 461031 461031 461031

474095

















MASTERTEMP® Pool and Spa Heater Installation and User’s Guide Rev. M 1-8-15

Section 6. Maintenance/Replacement Parts

MASTERTEMP HEATER REPLACEMENT PARTS

1

3

4

5

7

6

22

21

REPAIR PARTS – WATER SYSTEM

Key Part 175NA - 200NA 250NA 300NA 400NA

No. Description Qty. 175LP - 200LP 250LP 300LP 400LP

1 Tube Sheet Coil Assembly Kit (NA, LP Series)

(Includes Key No.3) 1 77707-0232 460747 77707-0233 77707-0234

1Tube Sheet Coil Assembly Kit (NA - HD Series)

(Includes Key No.3) 1 473710 77707-0244

1Tube Sheet Coil / Combustion Chamber Kit (ASME SERIES)

Bronze Header - Key Nos. 3-12, 15, 20-22, 1 460941 460940

1

Tube Sheet Coil / Combustion Chamber Kit (HD ASME SERIES)

2Manifold Kit (Includes Key Nos. 3-14, 21, &

Key Nos. 5-7 in “Electrical System”, Page 53 1 77707-0014 460748 77707-0015 77707-0016

• Basic Manifold Kit (includes Key No. 3,5,10-14) 474200 474200 474200 474200
3 Coil/Tubesheet Sealing O-Ring Kit 77707-0117(6) 460749(8) 77707-0118(10) 77707-0119(12)
4 Manifold Bottom Plate
5 Manifold O-Ring 1

• O-Ring Kit (Incl. Key Nos. 3, 5) 1 77707-0120 77707-0120 77707-0120 77707-0120

6 Manifold Insert* 1

7 Manifold Baffle Plate
8 Manifold Bypass Valve 1
9 Water Pressure Switch 42001-0060S 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

and 1 O-Ring) 2 77707-0017 77707-0017 77707-0017 77707-0017

15 Thermal Regulator Kit

(Incl. Key No. 16, 17, 18, 19 and Spring Clip) 77707-0010 77707-0010 77707-0010 77707-0010
16 Thermal Regulator (Includes Spring Clip) 38000-0007S 38000-0007S 38000-0007S 38000-0007S
17 Thermal Regulator Spring 1
18 Thermal Regulator Cap O-Ring 1 35505-1313 35505-1313 35505-1313 35505-1313

• Thermal Regulator Spring Clip 1
19 Thermal Regulator Cap
20 Drain Plug U178-920P U178-920P U178-920P U178-920P
21 3/4" Pipe Plug 1 U78-60ZPS U78-60ZPS U78-60ZPS U78-60ZPS
22 Pressure Relief Valve (Recommended -

(Purchase Separately) 1 38674-0719 38674-0719 38674-0719 38674-0719

* Not available separately. • Not illustrated.

 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.

For ASME heater manufactured AFTER 10/31/2013 (New 9-bolt lid tub design)



For heater manufactured BEFORE 1/12/2009

– 474063

472732Z 474097

( )

1

1

1

1
1

1
1

474058

 474059 474060 474061

474955 – 474956

–

77707-0001 77707-0001 77707-0001 77707-0001

U9-226 U9-226 U9-226 U9-226

2

8

474349, 474954

9

10

11

12

13

14

15

16

17

18

19

20

Model

 – 474065

 – 474096



––

––

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7

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Section 6. Maintenance/Replacement P arts

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MASTERTEMP HEATER REPLACEMENT PARTS

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12

8

9

REPAIR PARTS – ELECTRICAL SYSTEM

Model

Key Part 175NA - 200NA 250NA 300NA
No. Description Qty. 175LP - 200LP 250LP 300LP 400LP

1 Heater Display Cover 1 42002-0035 42002-0035 42002-0035 42002-0035
2 Igniter Bracket 1 42001-0030S 42001-0030S 42001-0030S 42001-0030S
3 Igniter/Igniter Gasket Kit Incl. Key Nos. 3 and 4) 1 77707-0054 77707-0054 77707-0054 77707-0054
4 Igniter Gasket 1 42001-0066S 42001-0066S 42001-0066S 42001-0066S
5 Automatic Gas Shutoff Switch (AGS) 1 42002-0025S 42002-0025S 42002-0025S 42002-0025S
6 High Limit Switch 1 42001-0063S 42001-0063S 42001-0063S 42001-0063S
7 Thermistor 1 42001-0053S 42001-0053S 42001-0053S 42001-0053S
8 Terminal Board 1
9 Fireman’s Switch Fuse (1.25A, 1-1/4") 32850-0099 32850-0099 32850-0099 32850-0099
10 Ignition Control Module 1 42001-0052S 42001-0052S 42001-0052S 42001-0052S
11 Transformer, 120/240V 1 42001-0107S 42001-0107S 42001-0107S 42001-0107S
12 Air Flow Switch 42001-0061S 42001-0061S 42001-0061S 42001-0061S
13 Control Board Kit (NA, LP Series) 1 42002-0007S 42002-0007S 42002-0007S 42002-0007S

• Heater Wiring Harness - 120/240V 1 42001-0104S 42001-0104S 42001-0104S 42001-0104S

• 120/240 Volt Plug Kit 42001-0105S 42001-0105S 42001-0105S 42001-0105S
14 Heater, Top 42002-0034Z 42002-0034Z 42002-0034Z 42002-0034Z
15 Membrane Pad (NA, LP Series) 472610Z 472610Z 472610Z 472610Z
16 Stack Flue Sensor 1 42002-0024S 42002-0024S 42002-0024S

1

1

1
1
1

42001-0056S 42001-0056S 42001-0056S 42001-0056S

400NA

42002-0024S

• Not available separately.

* Kit parts not available separately

.

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1620 HAWKINS AVE., SANFORD, NC 27330 • [phone]
10951 WEST LOS ANGELES AVE., MOORPARK, CA 93021 • [phone]
www.pentairpool.com

All Pentair trademarks and logos are owned by Pentair or by one of its global affiliates. Pentair Aquatic Systems™, MasterTemp®,
IntelliTouch®, EasyTouch®, are trademarks and/or registered trademarks of Pentair Water Pool and Spa, Inc. and/or its affiliated companies
in the United States and/ or other countries. Unless expressly noted, names and brands of third parties that may be used in this document
are not used to indicate an affiliation or endorsement between the owners of these names and brands and Pentair Water Pool and Spa, Inc.
Those names and brands may be the trademarks or registered trademarks of those third parties. Because we are continuously improving
our products and services, Pentair reserves the right to change specifications without prior notice. Pentair is an equal opportunity employer.

© 2015 Pentair Water Pool and Spa, Inc. All rights reserved. This document is subject to change without notice.

*472592*

P/N 472592 REV. M 1/2015

MASTERTEMP® Pool and Spa Heater Installation and User’s Guide Rev. M 1-8-15