STA-RITE SR200NA, SR333NA, SR200LP, SR200HD, SR333LP Operation & Installation Manual

Attention Installer

Please give this manual to the owner and/or
operator once installation is complete.

Attention User

Please retain this manual for future reference, it
contains important information that will help you in
operating and maintaining this heater.

Call [phone] for additional free copies of these instructions.

© 2008 Pentair Water Pool and Spa, Inc.

This document is subject to change without notice.

1620 Hawkins Ave., Sanford, NC 27330 • [phone] • [phone]
10951 West Los Angeles Ave., Moorpark, CA 93021 • [phone] • [phone]

All rights reserved.

1

1

1

Max-E-Therm

Pool & Spa Heater

OPERATION & INSTALLATION MANUAL

120/240 VAC NATURAL GAS/LP GAS

MODELS Natural Propane HD

200K BTU/HR SR200NA SR200LP SR200HD
333K BTU/HR SR333NA SR333LP SR333HD

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Retain For

Future

Reference

400K BTU/HR SR400NA SR400LP SR400HD
400K BTU/HR (ASME) 460763 460764

WARNING

FOR YOUR SAFETY - READ BEFORE OPERATING

•

If you do not follow these instructions exactly, a fire or explosion may result, causing property
damage, personal injury or loss of life.

• Improper installation, adjustment, alteration, service or maintenance can cause property damage,

personal injury or death. Installation and service must be performed by a qualified installer, service
agency or the gas supplier.

• Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this heater or

other appliances.

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.

For additional free copies of this manual; call [phone].

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

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

Rev. B 6-23-08 P/N S794

Pentair Water Pool and Spa, Inc.

• [phone]

2

Customer Service

If you have questions about ordering Pentair replacement parts, and pool products,
please use the following contact information.

Customer Service and Technical Support (8 A.M. to 5 P.M. Eastern Time/Pacific Time)

Phone: [phone]

Fax: [phone]

Web site

visit

www.pentairpool.com

or

www.staritepool.com

to find information about Pentair products

© 2008 Pentair Water Pool and Spa, Inc. All rights reserved.

1620 Hawkins Ave., Sanford, NC 27330 • [phone] or [phone]
10951 West Los Angeles Ave., Moorpark, CA 93021 • [phone] or [phone]
293 Wright Street, Delavan, WI 53115 • [phone]

This document is subject to change without notice.

Trademarks and Disclaimers: Sta-Rite®, Max-E-Therm®, IntelliTouch® and 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 counties. Saf-T Vent® is a registered trademark of Selkirk
Corporation. Unless noted, names and brands of others that may be used in this document are not used to indicate an affiliation or endorsement
between the proprietors 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 parties or others.

P/N S794 Rev. B 6-23-08

Table of Contents

Section 1. Introduction .......................................................................................................... 5

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

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

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

Consumer Information and Safety Information ...................................................................................................................................... 6 - 8

General Specifications ......................................................................................................................................................................... 8

Section 2. Installation ............................................................................................................. 9

Heater Description ................................................................................................................................................................................ 9

Sequence of Operation/Putting the Heater into Service ........................................................................................................................ 9

Specifications ...................................................................................................................................................................................... 10

Plumbing Connections .......................................................................................................................................................................... 11

Valves .................................................................................................................................................................................................. 11

Manual By-Pass .................................................................................................................................................................................. 11

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

Below Pool Installation ......................................................................................................................................................................... 12

Gas Connections ................................................................................................................................................................................. 13

Sediment Traps .................................................................................................................................................................................... 13

Gas Pipe Sizing ................................................................................................................................................................................... 14

Testing Gas Pressure/Gas Pressure Requirements ............................................................................................................................. 15

Outdoor Installation .............................................................................................................................................................................. 16

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

Indoor Venting—General Requirements (Category I & Category III – clarification) ............................................................................... 18

Heater Clearances ................................................................................................................................................................................ 18

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

Combustion Air Supply ......................................................................................................................................................................... 19

Corrosive Vapors and Possible Causes ................................................................................................................................................ 19

Vent Installation (Indoor Installation for U.S. or Outdoor Shelter for Canada) ........................................................................................ 20

Vertical Venting - Negative Pressure ................................................................................................................................................... 20 - 22

Horizontal or Vertical Venting - Positive Pressure ................................................................................................................................ 23

Connecting Special Gas Venting .......................................................................................................................................................... 23 - 25

Outdoor Shelter Installation .................................................................................................................................................................. 26

Garage or Utility Room Installation ....................................................................................................................................................... 26

Control Panel Indexing ......................................................................................................................................................................... 27

Final Installation Check ........................................................................................................................................................................ 27

Electrical Connections .......................................................................................................................................................................... 28

Fireman’s Switch Connection/Remote Control Connections .................................................................................................................. 29

Max-E-Therm

Electrical Schematic Ladder Diagram ................................................................................................................................................... 31

Section 3. Operation ............................................................................................................... 32

Basic System Operation ...................................................................................................................................................................... 32

HSI (Hot-Surface Ignition) Lighting/Operation ....................................................................................................................................... 32

Operating Instructions .......................................................................................................................................................................... 33

To Turn Off Gas to Appliance ............................................................................................................................................................... 33

Safety Controls .................................................................................................................................................................................... 34 - 36

Section 4. Troubleshooting ................................................................................................... 37

Initial Troubleshooting and Troubleshooting Chart ................................................................................................................................. 37

Heater Will Not Fire Troubleshooting .................................................................................................................................................... 38 - 41

LED Diagnostics .................................................................................................................................................................................. 42 - 43

Burner / Heat Exchanger Troubleshooting ............................................................................................................................................ 44

Section 5. Maintenance ..........................................................................................................45

Care and Maintenance .......................................................................................................................................................................... 45

Pressure Relief Valve ........................................................................................................................................................................... 45

After Start-Up ...................................................................................................................................................................................... 46

Spring, Fall and Winter Operation ......................................................................................................................................................... 46

Maintaining Pool Temperature ............................................................................................................................................................... 47

Energy Saving Tips .............................................................................................................................................................................. 47

Chemical Balance ................................................................................................................................................................................ 47 - 48

Replacement Parts .............................................................................................................................................................................. 49 - 53

®

Wiring Diagram ............................................................................................................................................................. 30

3

Rev. B 6-23-08 P/N S794

4

P/N S794 Rev. B 6-23-08

Max-E-Therm

®

Pool and Spa Heater

Section 1. Introduction

Introduction

5

Max-E-Therm

®

Pool and Spa Heater

Congratulations on your purchase of a Max-E-Therm high performance heating system. Proper installation and service
of your new heating system and correct chemical maintenance of the water will ensure years of enjoyment. The
Max-E-Therm is a lightweight, efficient, induced-draft, gas fired high performance pool and spa heater that can be
directly connected to schedule 40 PVC pipe, [schedule 80 CPVC for ASME models only]. The Max-E-Therm also
comes equipped with the Pentair multifunction temperature controller which shows, at a glance, the proper functioning of
the heater. All Max-E-Therm heaters are designed with a direct ignition device, HSI (hot-surface ignition), which eliminates
the need for a standing pilot. The Max-E-Therm 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 Max-E-Therm high performance heater. The information
in this manual applies to all Max-E-Therm 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 Max-E-Therm. Its use will reduce service calls and chance of injury and will
lengthen product life. History and experience has shown that most heater damage is caused by improper installation
practices.

IMPORTANT NOTICES

...For the installer and operator of the Max-E-Therm pool and spa heater. The manufacturer’s warranty may be void if,
for any reason, the heater is improperly installed and/or operated. Be sure to follow the instructions set forth in this
manual. If you need any more information, or if you have any questions regarding to this pool heater, please contact
Pentair Water Pool and Spa, Inc. at [phone].

WARRANTY INFORMATION

The Max-E-Therm pool heater is sold with a limited factory warranty. Specific details are described on the warranty
registration card which is included with the product. Return the warranty registration card after filling in the serial

number from the rating plate inside the heater.

Pentair Water Pool and Spa’s 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. B 6-23-08 P/N S794

6

Section 1. Introduction

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/NFPA54 and the National Electrical Code, ANSI/NFP A70 (U.S.), or standards CSA B149 – INST ALLATION
CODES FOR GAS-BURNING APPLIANCES AND EQUIPMENT and/or local codes and Standard CSA C22.1 –
Canadian Electrical Code, Part 1 (Canada). The heater, when installed, must be electrically grounded and bonded in
accordance with local codes, or, in absence of local codes, with the Canadian Electrical Code or the National Electrical
Code, ANSI/NFPA70, as applicable.

CONSUMER INFORMATION AND SAFETY

WARNING

The U.S. Consumer Product Safety Commission warns that elevated water temperature can be hazardous.
See below for water temperature guidelines before setting temperature.

1. Spa or hot tub water temperatures should never exceed 104° F. A temperature of 100° F. is considered safe for a
healthy adult. Special caution is suggested for young children. Prolonged immersion in hot water can induce hyperthermia.

2. Drinking of alcoholic beverages before or during spa or hot tub use can cause drowsiness which could lead to
unconsciousness and subsequently result in drowning.

3. Pregnant women beware! Soaking in water above 100° F. 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 .
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.

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.

P/N S794 Rev. B 6-23-08

WARNING

Section 1. Introduction

7

SAFETY INFORMATION

The Max-E-Therm® 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.

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.

WARNING —

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.

Risk of explosion if unit is installed near propane gas storage. Propane (LP) gas is heavier
than air. Consult local codes and fire protection authorities about specific installation requirements
and restrictions. Locate the heater away from propane gas storage and filling equipment as specified
by the Standard for the Storage and Handling of Liquefied Petroleum Gases, CAN/CSA B149.2

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

WARNING —

Rev. B 6-23-08 P/N S794

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.

8

SAFETY INFORMATION, (cont’d.)

WARNING —

Risk of asphyxiation if exhaust is not correctly vented. Follow venting instructions exactly
when installing heater. Do not use a drafthood with this heater, as the exhaust is under

pressure from the burner blower and a draft hood will allow exhaust fumes to blow into the room
housing the heater. The heater is supplied with an integral venting system for outdoor installation.
A vent conversion kit (See
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.

Page 23 for Part Numbers for Conversion Kits) is available for installations

Section 1. Introduction

CAUTION —

Label all wires prior to disconnection when servicing controls. Wiring errors can cause
improper and dangerous operation. Wiring errors can also destroy the control board.

• Connect heater to 120 or 240 Volt, 60 Hz., Single Phase power only.

• Verify proper operation after servicing.

• Do not allow children to play on or around heater or associated equipment.

• Never allow children to use the pool or spa without adult supervision.

• Read and follow other safety information contained in this manual prior to operating this pool
heater.

GENERAL SPECIFICATIONS

NOTICE:

• Combustion air contaminated by corrosive chemical fumes can damage the heater and will void the warranty.

• The Combination Gas Control Valve on this heater differs from most appliance gas controls. If it must be replaced,
for safety reasons replace it only with an identical gas control.

• The access door panels must be in place to provide proper ventilation. Do not operate the heater for more than five (5)
minutes with the access door panels removed.

• This heater is design certified by CSA International as complying with the Standard for Gas Fired Pool Heaters,
ANSI Z21.56/CSA 4.7, and is intended for use in heating fresh water swimming pools or spas.

• The heater is designed for the heating of chlorine, bromine or salt system swimming pools and spas. It should NOT
be used as a space heating boiler, or general purpose water heater. The heater requires an external 120 or 240 VAC
single-phase electric power source.

• 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”,

• 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 five feet of the inside surface of a pool or spa unless it is separated by a solid
fence, wall or other permanent barrier.

P/N S794 Rev. B 6-23-08

page 18).

Section 2. Installation

Gas

Air

Mixer

Blower

Inlet
(Cold
Water)

Exhaust

Heating Coils

Outlet
(Mixed
Water)

Burner

Installation Instructions

HEATER DESCRIPTION

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

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

SEQUENCE OF OPERATION

9

An electronic temperature sensing thermistor in the manifold
adapter inlet controls the heater operation. When the inlet water
temperature drops below the temperature set on the operating

control, the burner controller supplies power to the combustion
air blower through a series of safety interlocks. The interlocks consist of:

• the pressure switch (PS), which senses that the pump is running,

• the high limit switch (HLS), which opens if the heat exchanger outlet temperature goes above 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 500° F (260° 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 START-UP” (
in the front of this manual. Check for proper operation of the heater by following the steps under “OPERATION
INSTRUCTIONS.”

Figure 1.

page 32)

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

Rev. B 6-23-08 P/N S794

10

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Section 2. Installation

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

13.

14.

19.4

25.1

FRONT VIE

BACK VIE

Figure 2.

TLE

.6

18.

RIGHT SIDE VIEW

T

P VIE

25.

P/N S794 Rev. B 6-23-08

er

Out to Pool or Spa

l

Section 2. Installation

1. Set Manual
Bypass Valve

2. Remove handle

Cool Water In

Inlet from

Filter

Outlet to

Pool

Warm Water Out

PLUMBING CONNECTIONS

The Max-E-Therm® heater has the unique capability of direct
schedule 40 PVC, [schedule 80 CPVC for ASME models]
plumbing connections. A set of bulkhead fittings is included
with the Max-E-Therm to insure conformity with Pentair’s
recommended PVC plumbing procedure. Other plumbing
connections can be used. See Figure 3 for plumbing connections.

Modular Media

Filter

To Filter

Inlet

11

TM

From Filter Outlet

to Heater

Inlet

Warm Wat

To Po o

CAUTION

Before operating the heater on a new installation, turn
on the circulation pump and bleed all the air from the
filter using the air relief valve on top of the filter. Water
should flow freely through the heater. Do not operate
the heater unless water in the pool/spa is at the proper
level. If a manual by-pass is installed, temporarily close it

Cool Water
In From Pool

Corrosion Resistant,

Positive Seal

Check Valve

Cool Water
In From Spa

To Sp a

Sanitizer

Figure 3.

Typical Installation

to insure that all air is purged from the heater.

VALVES

When any equipment is located below the surface of the pool or spa, valves should be placed in the circulation piping
system to isolate the equipment from the pool or spa. Check valves are recommended to prevent back-siphoning. Back­siphoning is most likely to occur when the pump stops, creating a pressure-suction differential. Do NOT sanitize the pool
by putting chlorine tablets or sticks into the skimmer(s). When the pump is off, this will cause a high concentration of
chlorine to enter the heater, which could cause corrosion damage to the heat exchanger.

CAUTION

Exercise care when installing chemical feeders so as to not allow back siphoning of chemical into the heater, filters
or pump. When chemical feeders are installed in the circulation of the piping system, make sure the feeder outlet line
is down stream of the heater, and is equipped with a positive seal noncorrosive “Check Valve”, (P/N R172288),
between the feeder and heater.

MANUAL BY-PASS

Where the water flow rate exceeds the maximum 120 GPM, a manual bypass
should be installed and adjusted. After installing the valve, adjust the valve to
bring the flow rate within the acceptable range. Then remove the valve handle
or lock it in place to avoid tampering. See Figure 4.

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

002)67(02)454(021

333)521(33)454(021

004)251(04)454(021

See page 45 for Pressure Relief Valve Installations.

Rev. B 6-23-08 P/N S794

Figure 4.

.gnipipgnitcennocehtrofetar

wolfdednemmocermumixamehtdeecxetonoD*

Table 1.

12

Section 2. Installation

WATER CONNECTIONS

Figure 5.

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 dischar ges
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 11- Table 1 for setting of

the manual by-pass valve.

Main
Drain

Pool

Make sure that the outlet plumbing from the heater contains
no shut-off valves or other flow restrictions that could prevent
flow through the heater (except for below pool 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. Do not use a shut-off
valve to isolate the heater unless it is below the level of the

From Pool

3-Way

Valve

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

heater and the chemical feeder to prevent back-siphoning through the heater when the pump is off.
NOTICE: If the heater is plumbed in backwards, it will cycle continuously. Make sure piping from 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

Spa

Chlorinator

Check Valve

Heater

Filter

Pump

3-Way

Valve

BELOW POOL INSTALLATION

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

See following CAUTION before installation.

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 34, Figure 32.

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.

P/N S794 Rev. B 6-23-08

CAUTION

FLOW SWITCH

Section 2. Installation

13

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 tables, shown on
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" (10.2cm) wc and not more than 14" (35.6cm) 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
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 14. 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.

page 14, show which size pipe is required for the distance from the gas meter to

Figure 6.

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 valve must be installed externally to the heater.

WARNING

DO NOT INSTALL THE GAS LINE UNION INSIDE THE HEATER CABINET. THIS WILL VOID YOUR WARRANTY.

SEDIMENT TRAPS

Install a sediment trap and union located outside the heater
panels in accordance with National code requirements. Do
not use a restrictive gas cock. The sediment trap shall be
either a tee 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
Tr ap

1" Dia. or larger

(See "Recommended
Pipe Sizes" Chart)

Bell
Reducer

At least 9"

At least 3"

Figure 6.

Manual
Shut-off
Valve

Rev. B 6-23-08 P/N S794

14

GAS PIPE SIZING

Section 2. Installation

Table 2.

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

LEDOM

TANORPTANORPTANORPTANORPTANORPTANORPTANORP

002-’02’03’08’521’052’054’006 ------

333--’01’03’05’001’002’053’004’006 ----

004 --- ’01’02’06’001’051’002’054’004 ---

“RESIDENTIAL”

PROPANE

GAS 2 STAGE REGULATION

In many Propane gas line installations, the gas supplier and/or installer will utilize a two stage regulation process
where by at the supply tank they will install the first stage gas regulator, which would be at a higher pressure, usually
10 psi. This higher pressure allows for a much longer distance and in a much smaller pipe size. Then within a short
distance of the pool heater, usually around 24 inches, they will install a second regulator, which is the second stage,
and this would be set at the required inlet pressure of the heater.

See “Gas Pressure Requirement Charts”

gniziSepiPsaG"erusserPwoL"owTegatS

HTGNELEPIPTNELAVIUQEMUMIXAM

Table 4.

ledoM.tF05ot0.tF001ot05.tF051ot001

004hguorht002.ni2/1.ni2/1.ni2/1

gniziSepiPsaG"erusserPhgiH"enOegatS

.TF.UCreP.U.T.B0052@ISP01

HTGNELEPIPTNELAVIUQEMUMIXAM

ledoM.tF01ot0.tF02ot01

004hguorht002.ni4/3.ni4/3

Table 3.

.C.W.ni41tates2egatS

“RESIDENTIAL”

In many Natural gas line installations, the gas supplier and/or installer may utilize a two stage regulation process
where by at the streets main gas supply they will install the first stage gas regulator, which would be at a higher
pressure. This higher pressure is usually set at 2 psi or 5 psi and can be for long distances and in a much smaller pipe
size. Then within a short distance of the pool heater, generally around 24 inches, they will install a second regulator,
which is the second stage. This second stage regulator would be set at the minimum operating pressure for the heater.
For “Natural Gas Pentair Pool Heaters” the minimum is 7 inches W.C.

See “Gas Pressure Requirement Charts”

ledoM.tF05ot0.tF001ot05.tF051ot001

333hguorht002.ni2/1.ni2/1.ni2/1

004.ni4/3.ni4/3.ni4/3

004hguorht002.ni2/1.ni2/1.ni2/1

P/N S794 Rev. B 6-23-08

NATURAL

gniziSepiPsaG"erusserPhgiH"enOegatS

.TF.UCreP.U.T.B0001@ISP2

HTGNELEPIPTNELAVIUQEMUMIXAM

.TF.UCreP.U.T.B0001@ISP5

Table 5.

GAS 2 STAGE REGULATION

gniziSepiPsaG"erusserPwoL"owTegatS

.C.W.ni7tates2egatS

HTGNELEPIPTNELAVIUQEMUMIXAM

ledoM.tF01ot0.tF02ot01

333hguorht002.ni4/3.ni4/3

004.ni4/3.ni1

.C.W.ni7tates2egatS

004hguorht002.ni4/3.ni1

Table 6.

Section 2. Installation

15

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.

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

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

CHECKING THE GAS PRESSURE THROUGH THE COMBINATION GAS CONTROL VALVE

WARNING

Risk of fire and explosion. Improper installation, incorrect adjustment, alteration, service, or maintenance of the Combination
Gas Control Valve can lead to fire or explosion, causing loss of life, personal injury, and/or property damage. If it is necessary
to adjust the gas valve, this must be done by only by a qualified service agency. These instructions are for the use of

qualified service technicians only!

This appliance is equipped with an unconventional gas control valve that is factory set with a manifold pressure of –.2"
(–0.5cm) wc. Installation or service must be performed by a qualified installer, service agency, or the gas supplier. If this
control valve is replaced, it must be replaced with an identical control.

The combination gas
valve incorporates dual
shut-off valves and a
negative-pressure regulator.
For proper operation, the
regulated pressure at the

To Air Flow
Switch

Connection

for Service

To Air Flow
Switch

To Gas
Valve Vent

To Gas
Valve Vent

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

Figure 7.

in

To Low Side of
Differential Pressure Gauge

Pressure Tap

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

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

Rev. B 6-23-08 P/N S794

CAUTION

:ETON

.smelborp

erusserPsaG

telnImumixaM

telnImuminiM

dlofinaM

retaehelihw

larutaNenaporP

.C.WsehcnI

4141

44

1.0±2.0-1.0±2.0-

retaehelihwnekatebtsumsgnidaerllA
edamsgnidaerrostnemtsujdaynA.gnitareposi
ecnamrofrepnitluserlliwffosi

Table 7.

16

Section 2. Installation

OUTDOOR INSTALLATION

For heaters located outdoors, using the built-in stackless venting system.

(U.S. and Canada)

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 42001-0085S, see

Figure 8.

Bolt Down Bracket Kit

P/N 42001-0085S

Lead
Anchor

HEATER CLEARANCES – OUTDOOR

IMPORTANT!

• In an outdoor installation it is important to ensure water is diverted from
overhanging eves with a proper gutter/drainage system. The heater must
be set on a level foundation for proper drainage.

• This unit shall not be operated outdoors at temperatures below -20o F.

If the heater is located under a roof or deck overhang, there must be at least
three feet (1M) of clearance between the bottom of the overhang and the top of
the heater exhaust vent, see Figure 9. If the heater is under a roof or deck
overhang, the space around the heater must be open on three sides.

For minimum exhaust vent clearances for building openings, see

page 17.

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, see Figure 11,

page 17.

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

Figure 10,

CAUTION

Figure 8.

3 ft. (1 M) or more

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

P/N S794 Rev. B 6-23-08

Figure 9.

Section 2. Installation

OUTDOOR INSTALLATION

SIDE VIEW

6 in.

Window

4 ft.

Building

Exhaust
Grill
(Vent)

VENTING GUIDELINES

6"

3'

4'

Property Line

4'

Exhaust
Grill

Force

Air Inlet

(Vent)

Check local building codes

for setback requirements.

Vent Termination:

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 at the following distances away from
any door, window, or gravity air inlet:

4 ft. below,
4 ft. horizontally

17

Window

Building

OUTDOOR INSTALLATION

VENTING GUIDELINES

FOR CANADA

SIDE VIEW

6 in.

(15.24cm)

10 ft. (3M)

Exhaust
Grill
(Vent)

6"

3'

(.9M)

10'

(15.24cm)

(3M)

Property Line

10'

(3M)

Exhaust
Grill

Force

Air Inlet

(Vent)

Vent Termination:

Must be at least 3 ft. (.9M) above any forced
air inlet located within a 10 ft. (3M) radius.

Must be located 6 in. (15.24cm) away from the
building wall, and at the following distances away
from any door, window, or gravity air inlet:

10 ft. (3M) below,
10 ft. (3M) horizontally

Figure 10.

Check local building codes

for setback requirements.

Rev. B 6-23-08 P/N S794

Figure 11.

18

O

N

S

P

A

INDOOR VENTING — General Requirements

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

Section 2. Installation

Vented Appliance (Category I) –

Vertical only

An appliance that operates with a nonpositive vent static pressure and with a vent gas temperature that avoids excessive
condensate production in the vent, see

Vented Appliance (Category III) –

pages 20-22.

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 23-25.

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 18-27. If not, replace the vent system. DO NOT use

a draft hood with this heater.

®

The vent pipe must be the same size or larger. The Max-E-Therm

heaters operate with a positive vent static pressure
and with a vent gas temperature less than 400° F. The total length of the horizontal run must not exceed the length that is
listed in table 11 on page 23.

HEATER 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)

ALL SIDES .................. 6 in. (15 cm)

VENT............................6 in. (15 cm)

6 in.

Note: 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 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 operating control panel, located on the top
of the jacket, can be rotated for convenient access to the control panel.

OUTSIDE VENT COVER REMOVAL

The heater is supplied from the factory with a built-in stackless outside
vent for outdoor installation. Remove the outside vent cover for outdoor
shelter installation.

6 in.

6 in.

6 in.

Figure 12.

P/N S794 Rev. B 6-23-08

Section 2. Installation

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 .

Pentair W ater Pool and Spa, Inc. does not r ecommend
indoor installations that do not provide combustion
air from outside the building.

CAUTION

Air Supply Requirements Guide

for Max-E-Therm Heaters

)sretemitneC/sehcnIerauqS(

ledoM

002

333

004

*

noitsubmoCtneVnoitsubmoCtneV

.ni.qs002

.mc.qs1921

.ni.qs333

.mc.qs9412

.ni.qs004

.mc.qs1852

gnidliuBedisnImorFriAllAgnidliuBedistuOmorFriAllA

.ni.qs002

.mc.qs1921

.ni.qs333

.mc.qs9412

.ni.qs004

.mc.qs1852

.ni.qs05

.mc.qs323

.ni.qs48

.mc.qs245

.ni.qs001

.mc.qs546

*gninepOhcaErofaerAnepOeerFteNmuminiM

.ni.qs05

.mc.qs323

.ni.qs48

.mc.qs245

.ni.qs001

.mc.qs546

.gniliecehttaenodnalevelroolftaeno;sgninepoowtfoenorofsidetacidniaerA

Table 8.

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

Corrosive Vapors and Possible Causes

aerAstnanimatnoCylekiL

gnimmiwsdetanirolhC

sapsdnasloop

dnanoitcurtsnocweN

irolhcordyhsahcus

ap,sevisehda

saeragniledomer

.edirolhc

elb,snoitulosevawtnenamreP

srolrapytuaeB

.snobracoroulfro

rostnalpnoitaregirfeR

siniflairtsudnisuoirav

gnih

stnalpgnissecorpdna

.sevisehdanoitcurtsnoc

,sdicA.slacimehcgninaelcapsrolooP

.dicacitairumroc

noitcurtsnoc,stnemecdnaseulG

tniapdna,sehsinrav,stni

dnasexaW.sreppirtshsinravdna

muidosromuiclacgniniatnocsrenaelc

,sehca

snobracorolhcgniniatnocsnaclosorea

,stnemecdnaseulg,sdica,stnaregirfeR

nualdnagninaelcyrD

yrd

saera

Rev. B 6-23-08 P/N S794

spaosyrdnualro,stnegreted,sehcaelB

srenaelcdnasexaW.enirolhcgniniatnoc

uiclac,enirolhcgniniatnoc

muidosrom

.edirolhc

Table 9.

20

Com

b

ustio

C

r

V

ent Bod

y

y

C

C

Section 2. Installation

VENT INSTALLATION –

(Category I)

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

• Vent it vertically using T ype “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

(See

Figures 13, 14 and 15)

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

- NEGATIVE PRESSURE

lean the Interior Surface

4" x 8" Metal
Flue Collar

Vent Pipe

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:

lean and RTV

ralloCeulFlateM.oNtraP

"6x46700-70777

"8x47700-70777

hambe

Flue Collar

This Surface

Figure 13.

1. See Table 10, to determine allowable vent sizes for your heater.
NOTICE:

T able 10 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 10.

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

)sreteM(teeFnirotcennoCllaW-elbuoD"B"epyThtiwtneVllaW-elbuoD"B"epyT

eziStneV

.ni6)5.03(.tf001/)8.1(.tf6)5.03(.tf001/)9(.tf03.ceRtoN

.ni7)5.0

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

.ni01dna9)3.51(.tf05/)8.1(.tf6)5.03(.tf001/)8.1(.tf6)5.03(.tf001/)8.1(.tf6

eziStneV

.ni6)6.4(.tf51/)8.1(.tf6.ceRtoN.ceRtoN

.ni7)4.2(.tf8/)8.1(.tf6)6(.tf02/)3(.

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

.ni9.ceRtoN.ceRtoN)8.1(.tf6/)8.1(.t

.ni01.ceRtoN.ceRtoN.ceRtoN

002ledoM

.xam/.nimthgieH

3(.tf001/)8.1(.tf6)5.03(.tf001/)3(.tf01)5.03(.tf001/)6.4(.tf51

002ledoM

.xam/.nimthgieH

ledoM

333

.xam/.nimthgieH

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

333ledoM

nimthgieH

.xam/.

tf01)3.51(.tf05/)6.4(.tf51

f6

004ledoM

.xam/.nimthgieH

)sre

teM(teeFnirotcennoCllaW-elgniShtiwtneVllaW-elbuoD"B"epyT

004ledoM

.xam/.nimthgieH

P/N S794 Rev. B 6-23-08

Section 2. Installation

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 Vent
Body with two #10 sheet metal screws. Use
high temperature silicone RTV to seal the Flue
Collar to the Vent Body. Before connecting the
metal Flue Collar to the Vent Body, wet a clean
cloth or paper towel with isopropyl alcohol
(rubbing alcohol) and vigorously wipe the socket
of the Vent Body. Immediately wipe the cleaned
surfaces dry with a clean cloth or paper towel.
Repeat for the exterior of the 4" end of the metal
Flue Collar. Attach the metal Flue Collar to the
V ent 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

21

Listed
Termination
Cap

Storm Collar

Flashing

Firestop

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

WARNING

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

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

Figure 14. – Typical Metal Vent Pipe Installation - U.S.

(Vertical – Negative Pressure)

Listed
Termination

Min. 2 Ft.

(.7 M)

6" (15 cm) Minimum
Clearance to Combustible
Materials

Min. 10 Ft. (3.3 M)

Type B Double Wall

Metal Vent Pipe

Vent

Body

Metal Flue

Collar

Condensate
Drain w/trap

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.

Rev. B 6-23-08 P/N S794

Figure 15. – Typical Metal Vent Pipe Installation - Canada

(Vertical – Negative Pressure)

22

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.

Section 2. Installation

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.

P/N S794 Rev. B 6-23-08

Section 2. Installation

23

HORIZONTAL OR VERTICAL VENTING

- POSITIVE PRESSURE

(See Figures 16, 17, and 18)

(Category III)

Vent the heater either horizontally or vertically using an optional vent adapter of the 4-inch special gas approved Category III
vent pipes. Install the vent pipe in accordance with local codes and the provisions of the National Fuel Gas Code, ANSI Z223.1
(U.S.), or the standards CSA B149.1, Natural Gas and Propane Installation Codes (Canada), and the vent manufacturer’s
instructions. Do not use a draft hood with this heater. Install the vent according to the vent manufacturer’ s detailed instructions.

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

T able 1 1 for maximum permissible vent lengths.

NOTE

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

Each 90-degree elbow reduces the maximum horizontal vent run by 12 feet and each 45-degree elbow in
the vent run reduces the maximum vent run by 6 feet. See the table below for the maximum vent lengths
using 90-degree and 45-degree elbows.

The Max-E-Therm
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. Vent pipe construction will be of UL
1738 approved non-corrosive material, such as stainless steel, aluminum,
galvanized. A condensate trap may be needed. The use of “Approved”
thimbles, roof jacks and/or side vent terminals are required; and the
proper clearances to combustible materials must be maintained in
accordance with type of vent pipe employed—in the absence of a
clearance recommendation by the vent pipe manufacturer, the
requirements of the Uniform Mechanical Code should be met. The

ventilation air requirements for the Max-E-Therm heater can be
found on

page 19. It is recommended that vent runs over 18 feet may

need to be insulated to reduce condensation related problems and/or the
use of a condensate trap in the vent run close to the heater may be necessary
in certain installations such as cold climates. Horizontal vents 3’ (1M) or
less in length do not require a condensate tee. The Max-E-Therm heater
is suitable for through-the-wall venting.

®

may be installed as a “Category III” appliance and is a forced-draft pool and spa heater which uses

)latnoziroHrolacitreV(tneVsaGlaicepS.ni4

*

swoblE°09fo.oN)M(teeFnihtgneLmumixaM

0)M3.12(.tf07

1)M7.71(.tf85

2)M0.41(.tf64

3)M4.01(.tf43

4)M7.6(.tf22

*

selro)M1(’3stnevlatnoziroH.sedoclanoitan

ehtot”4/1tateltuoehtdrawot

.niardotetasnednoc

Table 11.

ecnadroccaniro,)M43.(toofenosihtgneltnevmuminiM
dnalacoldna,noitcurtsnis’rerutcafunamtnevhtiw
htgnelnis
nwodepolstsumtub,eetetasnednocaeriuqertonod

wollaot)M/mc2(toof

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

CONNECTING SPECIAL GAS VENT TO THE HEATER

Metallic:

1. Order an optional appliance adapter kit,

- 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 V ent 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.

Rev. B 6-23-08 P/N S794

CAUTION

(Pentair offers optional appliance adapter kits, call our Customer Service dept.):

24

Section 2. Installation

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 16 and 17),

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.

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

Vent Cap and
Riser Furnished
by Installer

Side

Wall Vent

Vent Cap and
Riser Furnished
by Installer

Chimney or Gas Vent

Outlet Air
Opening

Heater

Inlet Air
Opening

Figure 16.

Chimney or Gas Vent

Outlet Air Opening

Heater

P/N S794 Rev. B 6-23-08

Side

Wall Vent

Inlet Air Opening

Figure 17.

Section 2. Installation

25

Max. 12"
Min. 3"

Vent
Terminatio

At least 7'
above grade
adjacent
to public
walkways

Figure 18.

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

• at least 3" and at most 12" out from the wall (see

Figure 18):

Figure 19), 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 18):

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
or deck.

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.

Rev. B 6-23-08 P/N S794

Metal
Vent
Body

Metal Special
Gas Vent
requires
Appliance
Adapter

Condensate
drain w/Trap

(Optional)

Support
weight
of pipe

Condensate
Te e

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 19.

26

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

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

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

to avoid flammable vapors

18 in.

Section 2. Installation

OUTDOOR SHELTER INSTALLATION

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 20. 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 8, 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 9, page 19).

P/N S794 Rev. B 6-23-08

Figure 20.

Section 2. Installation

CONTROL PANEL INDEXING

On an outdoor shelter installation, the exhaust discharges into a vent
pipe. The heater control panel assembly, on top of the jacket, can be
turned to any of six positions for convenient access to the panel, see

Figure 21.

1. Unbolt and separate the jacket halves.

2. Pull hair pin clips.

3. Depress plastic clips on the control panel assembly .

4. Lift panel off of support plate.

5. Turn the assembly to the desired position and snap in place.

6. Make sure that the operating controls can be adjusted without having

to lean over the exhaust vent.

7. Replace hair pin clips.

8. Replace jacket halves and bolts and tighten.

27

Figure 21.

5

L
O

W
S

P
E
E

D
B
O

O
S

T
E
R

P
U
M

P

H
I
G

H
S

P
E

E
D

4

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 42001­0085S, see
designed to hold the unit to the equipment pad in high
wind conditions. Insert the Bolt Down Brackets in
the knockouts in the Lower Enclosure and bolt them
solidly to the pad. Installation of the anchor clamps
are recommended in all installations and are required
in Florida, (See Florida Building Code 301.13).

Figure 22, is available with anchor clamps

2

1

Bolt Down Bracket Kit

P/N 42001-0085S

Lead
Anchor

Rev. B 6-23-08 P/N S794

Figure 22.

28

g

(

)

Section 2. Installation

ELECTRICAL CONNECTIONS

Electrical Rating 60 Hz 120 / 240 Volts AC, single phase

Enclose the 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

• This heater is configured for a 240V application. If it is to be installed in a 120V application, remove the jacket halves,
open the control box, remove the 240V plug from the receptacle and replace it with the 120V plug. The 120V plug is
located within the control box. This procedure is to be performed prior to making any electrical connection to the heater.

• 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.

CAUTION

The heater ships from the Factory with the 240V 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 volts line current, the heater will not
operate.

Please read the boxes headed “IMPORTANT! READ ME FIRST!” on pages 37 and 41 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 15 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 .

Choose correct plug to match
incomin

voltage (120 or 240V)

120V: White to Red (L2) or
240V: Red to Red (L2)

120/240V: Black

to Black (L1)

Cutout for
Conduit from
Fireman's Switch

Green (Ground)

to

Green

Ground

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

Bonding
Wire

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, see

Figure 23.

Always use crimp type connectors when connecting
two wires.

Bonding Lug

Bonding Wire

View From Below
(Exterior)

Wire into bottom
of Junction-box
in Flexible Conduit

Wiring Harness
to Control Box

View From Above
(Interior)

Figure 23.

P/N S794 Rev. B 6-23-08

Section 2. Installation

29

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 upper jacket halves (see

3. Open control box cover.
4a. To connect a 2-Wire Control (such as Pentair’s

®

IntelliTouch

or EasyTouch®) 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 24V AC control
board circuit on the heater as shown in
DO NOT apply line voltage to the Fireman’s Switch
terminals. Use 18 gauge wire with a minimum 3/64”
(1.2mm) thick insulation rated for a temperature rise
of at least 105°C.

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

4b. To connect a 3-Wire Control:

- Connect wires between the control board terminals on
the heater and the external relays, as shown in
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 26) 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 and bolt up the jacket halves.
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 24).

Figure 25).

Figure 26.

Figure 24.

BK

O

J6

Y

Y

YY

1

9

FUSE

FUSE

24VAC

W

TRANS

GND

FS

24VAC

24VAC

THERMISTOR

MEMBRANE PAD

CONNECTION

E

TH

IND

VAL

BK

OPERATING CONTROL

O

ENABLE TOGGL
DISABLE TOGGLE

TERMINAL BOARD

TRANS

W

W

R

R

Time Clock or Remote

(Purchase Separately –

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!

L1

F1

R

BK

L1

L2

12 Pin

Receptacle

L1

G

GROUND (GND )

GND

24VAC

F
I

R

E

FL

M

A

N

S

X
BO

JUNCTION

TRANS

S

W

I

L2

T
C
H

BM

L2

Figure 25.

Rev. B 6-23-08 P/N S794

30

MAX-E-THERM® WIRING DIAGRAM

(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

GAS

AFS

AGS

SFS

JMP3

1

OPERATING CONTROL

External Control Interface

VAL

Spa Line

W

BK

TH

IND

GND

24VAC

Common Line

24VAC

FS

MEMBRANE PAD
CONNECTION

Pool Line

THERMISTOR

Y/R

Y/BL

Y/O

Y/W

Y

Y
Y
Y
Y

BR
BR

J6

NA/LP
Models Only

1

6

Y

Section 2. Installation

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.

VAL G ND

W

GND

YY

24VAC

SEC

Y/W

Y/O

Y/BL

Y/R

Y/W

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 26.

P/N S794 Rev. B 6-23-08

Section 2. Installation

MAX-E-THERM® ELECTRICAL SCHEMATIC LADDER DIAGRAM

LADDER DIAGRAM

L1 L2

L1

120/240

VAC

IGNITER

S1 S2 L2

31

24V

COM NO

F1

24 VAC

F2 BLOWER

120/240

VA

C

24 VAC

OPERATING

CONTROL

24 VAC

LOGIC

WATER

PRESSURE

SWITCH

HI
LIMIT
SWITCH

GND

CLASS II

TRANSFORMER

GND

AIR

FLOW

SWITCH

IND

TH

THERMISTOR

Rev. B 6-23-08 P/N S794

AGS

SWITCH

VAL

STACK FLUE

SENSOR

SENSOR

NOTES:

1.)

L1 L2 F1 F2 S1 24 VAC

S2 GND IND VAL

AND TH

ARE CONNECTED ON THE IGNITION MODULE.

2. )

PIN AND SOCKET CONNECTOR.

3. )

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.

GAS VALVE

Figure 27.

32

Section 3. Operation

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.

MAX-E-THERM® 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.

P/N S794 Rev. B 6-23-08

Section 3. Operation

OPERATING INSTRUCTIONS

1. STOP! Read the safety information on (page 32).

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

3. Turn off all electric power to the appliance.

4. This appliance does not have a pilot. It is equipped with an ignition device
which automatically lights the burner. Do not try to light the burner by hand.

5. Remove the jacket cover(s) by unfastening the screws connecting both halves
of the top jacket, see

6. Toggle-Style Valve: Pull toggle toward you to turn gas off, see Figure 29.

Figure 28.

33

7. Wait five (5) minutes to clear out any gas. If you then smell gas, STOP!
Follow “B” in the “Before Start-up” instructions (

page 32). If you don’t

Figure 28.

smell gas, go to the next step.

8. Toggle-Style Valve: Push toggle away from you to turn gas on.

9. Replace the jacket cover(s). All jacket covers must be in place when operating
the heater.

Toggle Style Valve

Gas control is shown ON.

Pull toggle toward you

to turn OFF.

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

You are
here

CONTROL PANEL”.

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

Figure 29.

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.

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 jacket cover(s), see

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

5. Replace the jacket cover(s).

Rev. B 6-23-08 P/N S794

Figure 28.

Figure 29.

34

Water

Pressure

Switch

SAFETY CONTROLS

AIR FLOW SWITCH (AFS)

The air flow switch, (see Figure 30), 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

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

Section 3. Operation

Figure 30.

Air Flow Switch

The water pressure switch, (see Figure 31). 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 instructions on

page 12. 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 32. 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.

HIGH LIMITS

Figure 31.

Star Wheel

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 Max-E-Therm
series of heaters contains two (2) high limit
devices which are located on the main inlet /
outlet header.

P/N S794 Rev. B 6-23-08

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

Figure 32.

Section 3. Operation

35

SAFETY CONTROLS, (cont’d.)

Flame Current

OPERATION OF IGNITION MODULE

The Ignition Module, (see Figure 33), 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.

▲▲

▼▼

▼ TEMP Press this button to lower the temperature setting.

▼▼

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

Check Point

System Operation

Indicator Lights

Operating Control for HD models

Diagnostic LED

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

Figure 33.

Digital Temperature

LOW SPEED

BOOSTER PUMP

HIGH SPEED

FILTER
PUMP

AUX

1

Display

Temperature Up/Down

Dual Temperature

Controls

Digital Temperature

Display

AUX

2

1. Turn the Operating Control OFF.

2. Press ▲ TEMP or ▼ TEMP for 5 seconds. The display will flash

System Operation

Indicator Lights

Temperature Up/Down

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:

Operating Control for all models except HD models

(See page 30 for the External Control Interface for HD models.)

Dual Temperature

Controls

Figure 34.

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

The SERVICE HEATER light indicates a fault in the heater or its controls. If this light comes on, shut down the heater
(See “TO TURN OFF GAS TO THE APPLIANCE” on

page 33), 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.

Rev. B 6-23-08 P/N S794

WARNING

36

Section 3. Operation

TEMPERATURE 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 of f 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 TEMPERATURE SET POINT

1. Unbolt and remove the upper jacket halves (see Figure 35).

2. Pull hair pin clips.

3. Press the clips and remove the control panel board dome. Locate the yellow
button on the corner of the control board.

4. Push the Max. Temp. Set Point button on the back of the control board
(see

Figure 36).

The following sequence should happen:

U
X

Figure 35.

A. The unit will come on and the POOL ON light will come on.
B. Press the ▲ TEMP or ▼ TEMP pad (on TOP of the panel) to set

maximum pool temperature.

Clips

L

O
W

S
P

E
E

D
B
O

O
S

T
E
R

P
U

M
P

H

I
G
H
S

P
E

E
D

A
2

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 Point 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.

5. Reinstall and bolt up the upper jacket halves.

2

1

SET

MA

S1

X

SET

MA

S1

X

Figure 36.

P/N S794 Rev. B 6-23-08

Section 4. Troubleshooting

Troubleshooting Instructions

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

NOTICE: Installing the black 120 volt plug in the control box and
then connecting the heater to a 240 volt line will destroy the trans -

former, control broad, and ignition control module, and will void the
warranty. If you install the red 240 volt plug and then connect the

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

READ THE FOLLOWINGCAREFULLY:

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

Start here for directions to specific Troubleshooting Chart

running.

IMPORTANT! READ ME FIRST!

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
is for 240 volts.

BLACK

plug is for 120 volts, the RED plug

37

Is green “POOL” or “SPA”
LED “on”

Is red “SERVICE SYSTEM”
LED “on”

Is red “SERVICE HEATER”
LED “on”

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

?

NO

?

NO

YE

YES

NO

Are any red diagnos­tic LED’s on back of

S

board (AGS, AFS,
SFS, HLS, PS or
THERMISTOR)

Does red “SERVICE
HEATER” LED come
“on”

NO

YES

NO

NO

“on”

YES

YE

Go to chart “HEATER WILL
NOT FIRE - A”
(Page 38)

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

Go to specific safety switch
troubleshooting chart
(Pages 41 and

S

Go to chart ‘HEATER WILL
NOT FIRE -C”
(Page 40)

42)

WARNING WARNING

Disconnect power before servicing any components.

Rev. B 6-23-08 P/N S794

Hazardous voltage. Can shock, burn or kill.

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

switch terminals to remedy a failed safety switch.

Board.

Fire and Explosion hazard.

Do not jumper

38

Heater Will Not Fire - A
Start

Section 4. Troubleshooting

Is green “SPA” or
“POOL” LED

YES

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

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 40 and 41).
Check fuse and all
other 24V components

damage.

for

“on”

120V)

NO

NO

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

on?

come

YES

YES

YES

Check for line voltage to
heater

.

Check for 24 VAC at sec­ondary of Transformer

Check for Line Voltage
between L1 and L2 terminals
on Terminal

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.

Board.

YES

NO

NO

YES

NO

.

NO

NO

YES

Heater should fire on demand

heat.

for

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.

.

.

S

YE

NO

GO TO
“HEATER WILL NOT FIRE - B”
Page 39

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

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

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?

on?

“on”?

NO

YES

NO

YES

YES

NO

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

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

Replace Membrane Pad.

Replace Control Board.

relay).

.

heat.

P/N S794 Rev. B 6-23-08

Section 4. Troubleshooting

Heater Will Not Fire - B
Start

39

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

YE

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

S

Heater should fire on call for

obstructions.

heat. Re-verify that water flow
is above minimum require­ment.

Minimum Flow Requirements

Model Flow

200 20 gal/min (76 LPM)
333 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

.

Rev. B 6-23-08 P/N S794

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 40

YE

Model Flow

200 20 gal/min (76 LPM)
333 30 gal/min (114 LPM)
400 40 gal/min (151 LPM)

S

Go to “Diagnostic LED’s”,
(Pages 42 and 43)

40

Heater Will Not Fire - C
Start

Section 4. Troubleshooting

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 42 and

Did burner fire at all?

Go to “BURNER
TROUBLESHOOTING”

44)

(Page

Go to “HEATER WILL NOT
FIRE-D” (Page

Replace Ignition Control
Module.

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

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

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

2.

43.

CONTINUE

YES

41)

NO

YES

2.

NO

YES

NO

NO

YE

S

YE

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

on?

stay

Did Blower come on?

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

heat).

for

Check for 24 VAC
between TH and GND

S

terminals on Ignition
Control Module.
SEE NOTE

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

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

Replace Control
Board.

1.

YE

NO

NO

Go to “INITIAL
TROUBLESHOOTING”

Continue to observe heater
for several minutes. Cycle
heater on and off several
times. Observe for delayed or

YE

S

NO

S

NO

S

YE

NO

1.

S

YE

2.

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

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

Replace Gas Valve with
identical p

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 Va

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.

lve.

observed.

2.

YES

art.

P/N S794 Rev. B 6-23-08

Section 4. Troubleshooting

Heater Will Not Fire - D

IMPORTANT! READ ME FIRST!

IMPORTANT! 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 digita

l meter). If the ICM is bad, your volt-

Start

41

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.

YE

S

Check voltage across
igniter leads;

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

AC.

240 V

OK?

NO

NO

YES

Go back to chart “HEATER WILL
NOT FIRE-C” (Page 40).

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.

Rev. B 6-23-08 P/N S794

42

Section 4. Troubleshooting

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

AGS or HLS "on"

Replace High Limit
Switch (HLS) or
Automatic Gas
Shutoff

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

(AGS)

CONTINUE

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

.

YE

YE

NO

Verify that water flow rate is
above minimum required for
heater

.

S

YE

Verify that inlet water temper­ature is below 104˚

Verify that water flow rate is
above minimum required for
heater

.

Adjust Water Pressure Switch to close with pump running and open with
pump of

Does Blower operate?

Disconnect Blower and check

S

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

Check for 24 VAC between

S

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

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

f.

Board.

F.

blockage.

YES

NO

.

NO

connected.

NO

NO

NO

NO

YE

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

Replace thermistor or Control
Board to correct

Service pump and filter to
restore proper flo

S

Verify that there is no block­age in Blower intake, Heat
Exchanger, and exhaust and
that exhaust is not too long
(see “Special Gas Venting”
Page 23.

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

(PS).

overheating.

w.

CONTINUE

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

S

YE

NO

NO

NO

THERMISTOR "on"

CAUTION

remedy a failed switch.

P/N S794 Rev. B 6-23-08

Do not jumper a safety switch to

Connect correctly and retry.
Does Blower st

Replace Blower. Does Blower
start on ignition

Replace Ignition Control
Module.

Verify Thermistor wiring. If
OK, replace Thermistor

art?

try?

.

NOTE: ES1 is a spare and should be jumpered.

Section 4. Troubleshooting

Diagnostic LED's: SFS

SFS "on"

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

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

OR

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

Check pressure and volume
of fuel

supply

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?

NO

OK

YES

NO

YE

S

DONE

OK?

YES

NO

Check Heat Exchanger
Coil for leaks, liming, soot,

correctly?

NO

DONE

NO

YE

w.

S

or low flo

Check Thermal
Regulator: Open at
120˚?

Correct problem;
Heater should fire

YES

NOT OK

Check Thermal-Regulator:
Seats

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

NO

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”

NO

YES

NO

NO

43

NO

YES

.

.

fire.

?

NO

(HD )

NO

(Basic)

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.

.

Rev. B 6-23-08 P/N S794

44

Section 4. Troubleshooting

Burner Troubleshooting

SYMPTOM CAUSE REMEDY

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

and blower inlet.
See page 15 and verify that the gas

regulator setting is

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

Flame is “fluttery.” Flame is too lean. See page 15 and verify that the gas
Exhaust may have acrid regulator setting is –0.2" (–0.5cm) wc.
smell or burner may f
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.

ail

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

number of

low resistance to ground. Replace with
new igniter.

Verify burner flameholder is properly
grounded.

Replace

elbows.

Ignition Control Module.

–0.2" (–0.5cm) wc.

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. thermal governor

Heat exchanger plugged. Service

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

closed.

Service

heat exchanger. Correct water

chemistry.

thermal governor

Replace

.

.

P/N S794 Rev. B 6-23-08

Section 5. Maintenance

suppl

ied

fitting

s.

45

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 jacket covers 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 pressure switch. (See “WATER PRESSURE SWITCH” for testing instructions).

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

page 27. 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. The burner does not require maintenance or adjustment by the user. Call a qualified
service technician if you suspect that the burner may require maintenance.

PRESSURE RELIEF VALVE

Some U.S. local codes may require installation of a pressure relief valve (PR V).
Purchase separately and install 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.

A 3/4" NPT connection is provided in the manifold for installing a pressure relief
valve. The relief valve must be installed vertically. To install the valve, use a 3/4"
brass nipple and elbow (user supplied),

as illustrated in Figure 37. No valve is

allowed to be placed between the manifold adapter and the relief valve.
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 so as to allow complete
drainage from the valve and drain line. The relief valve should be tested at

least once a year by lifting the valve lever.

WARNING

User

pipe

Pipe relief valve discharge
to a drain or other safe
disposal site.

Figure 37.

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.

Rev. B 6-23-08 P/N S794

46

Section 5. Maintenance

AFTER START-UP

CHECKING WATER FLOW

WARNING

Fire or flooding hazard. If the unit overheats and the burner fails to shut off, follow instructions under “To Turn Off Gas to the Appliance”,

page 33, 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

Power

Manual Gas Valve OFF

Gas Control Valve Off

Toggle Style:

Throw switch
to OFF

VENT

RESS

P

TAB

PILOT

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.

Remove Water Pressure
Switch to help Manifold
Drain

• 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 minimumsetting 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

Open

Inlet

Outlet

down the heater and winterize it.

For outdoor heaters in freezing climates, shut the heater down and
drain it for winter as follows, see Figure 38:

Figure 38.

Drain Cock(s) and Plugs
OPEN

Close Isolation Valves

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).

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

4 . Remove the Water Pressure Switch. Plug the port in the manifold to prevent bugs and dirt from getting into the manifold.
5 . Drain the plastic inlet/outlet manifold through the outlet pipe. If the pipe does not drain naturally to the pool, install a drain cock

in the outlet pipe to drain the manifold.

6 . Cover air inlet grate with a plastic bag to prevent bugs, leaves, etc., from getting into the heater.
NOTICE: Water trapped in the heater can cause freeze damage. Allowing the heater to freeze voids the warranty.
T o 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 AR T -UP” (page 32) and “CARE AND MAINTENANCE” (page 45).

(See additional notes under Important Notices in Introduction.)

P/N S794 Rev. B 6-23-08

WARNING

Section 5. Maintenance

47

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 Pentair 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.

Rev. B 6-23-08 P/N S794

48

Section 5. Maintenance

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 T able 12.

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 12.

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

Chemical Values

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

Biological Values

Algae None None None
Bacteria None None Refer to Local Cod

Table 12.

e

NOTICE:

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

P/N S794 Rev. B 6-23-08

Failure to adhere to the listed water chemistry parameters may result in premature failure of the heat exchanger and will void the warranty.

3

5

8

For complete

Electrical System

parts breakdown
(Key Nos. 1 through 4),
See Page 53

49

MAX-E-THERM® REPLACEMENT PARTS

1

2

6

For complete

Water System

parts breakdown
(Key Nos. 10 through 12),
See Page 52

For complete

Burner System

parts breakdown
(Key Nos. 5 through 9),

4

See Pages 51 and 52

1

4

Repair Parts are available from your Pentair dealer.

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

Rev. B 6-23-08 P/N S794

50

3

6

For Heater mounting
bolts and clamps,
purchase separately

Bolt Down Bracket Kit,

Part No.

42001-0085S.

Lead
Anchor

MAX-E-THERM® REPLACEMENT PARTS

1

2

3
4

8

2

28

24

27

26

25

9

10

11

1

7

5

6

14

22

21

19

20

18

P/N S794 Rev. B 6-23-08

23

1

15

17

MAX-E-THERM® REPLACEMENT PARTS

REPAIR PARTS – BURNER SYSTEM

Model

Key Part SR200NA

No. Description

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

• Gas Orifice Kit – NG (Incl. Key Nos. 3 and 4)† 77707-0431 77707-0421 77707-0411

• Gas Orifice Kit – Propane (Incl. Key Nos. 3 and 4)† 77707-0461 77707-0451 77707-0441

• NG to Propane Conversion Kit
(Incl. Key Nos. 3 and 4)† 77707-1461 77707-1451 77707-1441

• Propane to NG Conversion Kit
(Incl. Key Nos. 3 and 4)† 77707-1431 77707-1421 77707-1411

5 Air Blower Kit

Natural Gas Units 77707-0251 77707-0252 77707-0253
Propane Units 77707-0254 77707-0255 77707-0256

• Air Orifice Kit (Includes Key Nos. 6 and 7) 77707-0111 77707-0112 77707-0113

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

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

• Flameholder Kit (Includes Key Nos. 10, 11, 12, 13
and on 333 & 400 models only ­Flameholder Insert) 77707-0202 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 Enclosure Kit, Upper Right-Hand
15 Condensate Evaporator Plate
16 One Piece Metal Chamber/Combustion Chamber

Assembly 42001-0200S 42001-0200S 42001-0200S

17

Lower Enclosure

18

Upper Enclosure Fastener: #12-11x2-1/2" Type AB,

Hex Washer Head S.S. Sheet Metal Screw

19

Enclosure Kit, Upper Left-Hand – Natural Gas
Enclosure Kit, Upper Left-Hand – LP Gas

19
20213/8" Washer, S.S.

3/8" Lock Washer, S.S.

22 3/8" Hex Nut, Brass

• Insulation Kit (Includes Key Nos. 13, 15, 23, 24, 25
and 26)

23

Bottom Outer Insulation Blanket *
24 1" Bottom Inner Insulation
25 1" Top Insulation

Top Outer Insulation Blanket *

26

•

Lower Enclosure Insulation
27 One Piece Metal Elbow/Combustion Chamber

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

28 Metal Vent Cover 42002-0005S 42002-0005S 42002-0005S

Qty.

1
2
1
1

1
1
1
1
1

1

1
1
1
1
1
1
1
1
1

1
1

4
1
1
4
4
4

1
1
1
1
1
1

1
1

SR200LP
SR200HD

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

77707-0002 77707-0002 77707-0002

42001-0001S 42001-0001S 42001-0001S

77707-3200N 77707-3333N 77707-3400N
77707-3200L 77707-3333L 77707-3400L

77707-0008 77707-0008 77707-0008

42001-0074S 42001-0074S 42001-0074S

SR333NA

SR333LP

SR333HD

SR400NA
SR400LP
SR400HD

460763 - NA

460764 - LP

51

* Not available separately.

† Not included with heater. Order separately

Rev. B 6-23-08 P/N S794

.

52

MAX-E-THERM® REPLACEMENT PARTS

1

3

4

5

7

6

22

21

2

8

9

10

11

12

13

14

16

20

17

18

15

19

REPAIR PARTS – WATER SYSTEM

Model

Key Part
No. Description Qty.

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

1 Tube Sheet Coil Assembly Kit (HD Series)

1
2 Manifold Kit (Includes Key Nos. 3-14, 21, and

3 Coil/Tubesheet Sealing O-Ring Kit ( ) 77707-0117(6) 77707-0118(10) 77707-0119(12)
4
5 Manifold O-Ring 1

•O
6 Manifold Insert* 1
7
8 Manifold Bypass Valve 1
8
9 Water Pressure Switch 42001-0060S 42001-0060S 42001-0060S

• Bypass Access Plug
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

15 Thermal Regulator Kit

15 Thermal Regulator Kit

16 Thermal Regulator (Includes Spring Clip) 38000-0007S 38000-0007S 38000-0007S
17 Thermal Regulator Spring 1
18 Thermal Regulator Cap O-Ring 1 35505-1313 35505-1313 35505-1313

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

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

(Includes Key No. 3) 1 77707-0242 77707-0243 77707-0244

6 Tube Pressure Vessel Kit (ASME Series)

Key Nos. 7-9 in “Electrical System”, Page 53 1 77707-0014 77707-0015 77707-0016

Manifold Bottom Plate

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

Manifold Baffle Plate

Manifold Bypass Valve Kit (Includes Install Tool)

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

(Incl. Key Nos. 16, 17, 18, 19 and Spring Clip) 77707-0010 77707-0010 77707-0010

(Includes Spring Clip and Install Tools)

Purchase Separately) 1 473715Z 473715Z 473715Z

1

1

1

1
1
1

1

1
1

1
1

SR200NA
SR200LP
SR200HD

SR333NA
SR333LP
SR333HD

SR400NA
SR400LP
SR400HD

(ASME)
460763 - NA
460764 - LP

460807

460923

473716Z
472648Z

460924

38000-0007S

473715Z

* Not available separately.

• Not illustrated.

P/N S794 Rev. B 6-23-08

MAX-E-THERM® REPLACEMENT PARTS

8

5

1

2

53

18

17

16

1

10

9

6

REPAIR PARTS – ELECTRICAL SYSTEM

Key Part SR200NA
No. Description Qty.

1

Display Cover Retainer Cap Kit,

Cap and CPSC Warning Label

2

Heater Display Cover
3 Igniter Bracket
4 Igniter/Igniter Gasket Kit (Incl. Key Nos. 4 and 5)
5 Igniter Gasket
6 Manifold Switch Cover
7 Automatic Gas Shutoff Switch (AGS)
8 High Limit Switch
9 Thermistor
10 Terminal Board
11 Fireman’s Switch Fuse (1.25A, 1-1/4")
12 Ignition Control Module
13 Transformer, 115/230V
14 Air Flow Switch
15 Control Board Kit (HD Series)

• Heater Wiring Harness - 115/230V

• 120/240 Volt Plug Kit

16 Junction Box Cover Kit 1 77707-0022

•

Control Board Enclosure/Membrane Panel Kit 1 77707-0004

HD Series (Includes Key Nos. 17 and 18)*

•

Control Board Enclosure/Membrane Panel Kit 1 77707-0013

NA, LP Series (Includes Key Nos. 17 and 18)*

Control Board Enclosure
1817Membrane Pad (HD Series)
18 Membrane Pad (NA, LP Series)
19 Stack Flue Sensor 1 42002-0024S

1 77707-0009
1 42001-0008S
1 42001-0030S
1 77707-0054
1 42001-0066S
2 42001-0007S
1
1
1 42001-0053S
1 42001-0056S
1
1 42001-0052S
1 42001-0107S
1
1
1
1 42001-0104S
1

1
1
1

SR200LP
SR200HD

42002-0025S
42001-0063S

32850-0099

42001-0061S
42001-0096S
42002-0007S15 Control Board Kit (NA, LP Series)

42001-0105S

19

3

4

5

Model

SR333NA
SR333LP
SR333HD

77707-0009
42001-0008S
42001-0030S

77707-0054
42001-0066S
42001-0007S
42002-0025S
42001-0063S
42001-0053S
42001-0056S

32850-0099
42001-0052S
42001-0107S
42001-0061S
42001-0096S
42002-0007S
42001-0104S
42001-0105S

77707-0022

77707-0004

77707-0013

42002-0024S

7

6

SR400NA
SR400LP

SR400HD
460763 - NA
460764 - LP

77707-0009
42001-0008S
42001-0030S

77707-0054
42001-0066S
42001-0007S
42002-0025S
42001-0063S
42001-0053S
42001-0056S

32850-0099
42001-0052S
42001-0107S
42001-0061S
42001-0096S
42002-0007S
42001-0104S
42001-0105S

77707-0022

77707-0004

77707-0013

42002-0024S

• Not available separately.
* Kit parts not available separately.

Rev. B 6-23-08 P/N S794

54

NOTES

P/N S794 Rev. B 6-23-08

NOTES

55

Rev. B 6-23-08 P/N S794

56

40

SAVE THESE INSTRUCTIONS

© 2008 Pentair Water Pool and Spa, Inc. All rights reserved.

This document is subject to change without notice.

1620 Hawkins Ave., Sanford, NC 27330 • [phone] or [phone]
10951 W. Los Angeles Ave., Moorpark, CA 93021 • [phone] or [phone]
293 Wright Street, Delavan, WI 53115 • [phone]

P/N S794 Rev. B 6-23-08