Jandy Lx User manual

FOR YOUR SAFETY - This product must be installed and serviced by authorized person-

nel, qualified in pool/spa heater installation. Improper installation and/or operation can

create carbon monoxide gas and flue gases which can cause serious injury, property

damage, or death. For indoor installations, as an additional measure of safety, Waterpik

Technologies strongly recommends installation of suitable Carbon Monoxide detectors in

the vicinity of this appliance and in any adjacent occupied spaces. Improper installation

and/or operation will void the warranty.

H0256100E

InstallationandOperatingData

WARNING

If these instructions are not followed exactly, a fire or explosion may result,

causing property damage, personal injury, or death.

Do not store or use gasoline or other flammable vapors and liquids in the

vicinity of this or any other appliance.

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’sinstructions.

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

Installation and service must be performed by a qualified installer, service

agency or the gas supplier.

Installation and

Operation Manual

LX® and

LT® Low NOx*

Gas-Fired Pool

and Spa Heater

Model LX/LT-Low NOx*

Natural Gas and LP

*Only models using natural gas are certified

as meeting low NOx emissions requirements.

Model

LX250-L

Shown

TABLE OF CONTENTS

SECTION 1. GeneralInformation

1.1 Introduction .................................................1

1.2 ConsumerInformationandSafety................1

1.2.1 Spa/HotTubSafetyRules ...........................1

1.2.2 SwimmingPoolEnergySafetyTips.............2

1.3 Warranty .....................................................2

1.4 CodesandStandards..................................2

1.5 TechnicalAssistance ..................................3

1.6 MaterialsInstallerMustProvide...................3

1.6.1 Materials for All Applications .......................3

1.6.2 Materialsfor Special Applications................3

1.7 Specifications..............................................3

1.7.1 GeneralSpecifications ................................3

1.7.2 Dimensions .................................................4

SECTION 2. InstallationInstructions

2.1 Introduction .................................................5

2.2 Field Assembly ...........................................5

2.3 LocationRequirements................................5

2.3.1 Introduction .................................................5

2.3.2 Clearances ..................................................5

2.3.3 Flooring .......................................................6

2.3.4 OutdoorInstallation .....................................6

2.3.5 IndoorandOutdoorShelterInstallation ........7

2.3.5.1 Convertingthe GrilltoaVent Collar .............8

SECTION 3. Venting

3.1 CombustionAirSupply................................8

3.2 ExhaustVenting..........................................9

3.3 VentPipe Sizing and GeneralInstallation....10

3.3.1 OutdoorInstallations ...................................10

3.3.2 IndoorandOutdoorShelterInstallations ......10

3.3.3 InspectionandReplacementofExisting

VentSystem with NewComponents ...........11

SECTION 4. Gas Connections

4.1 Gas Supply and Piping................................11

4.2 ManifoldPressure .......................................12

4.3 SpecialPrecautionsfor PropaneGas ..........13

SECTION 5. Water Connections

5.1 WaterPiping ...............................................13

5.2 CheckValveInstallation ..............................13

5.3 AutomaticFlowControlValve......................13

5.4 ReversibleWaterConnections.....................14

5.5 ConnectionsatHeater.................................16

5.6 PressureReliefValve ..................................17

5.7 AuxiliaryComponents,Chlorinators,Ozone

Generators,andSanitizingChemicals.........18

SECTION 6. Electrical

6.1 GeneralInformation .....................................18

6.2 MainPower .................................................18

6.2.1 ConvertingtheHeaterfora115V

Power Source .......................................20

6.3 Bonding.......................................................20

6.4 Auxiliary Time Clock Wiring ........................21

6.5 RemoteOperation .......................................21

SECTION 7. OperatingInstructions

7.1 NormalOperation ......................................23

7.2 Start-Up ....................................................23

7.3 TemperatureControls ................................24

7.3.1 InformationDisplayed ................................24

7.3.2 TurningtheHeaterOnorOff......................25

7.3.3 SettingPoolandSpaTemperatures,

Changing from Fahrenheit to Celsius....26

7.4 LightingandShutdownProcedures ...........26

7.4.1 LightingtheHeater ....................................26

7.4.2 ShutDown ................................................26

7.5 Adjusting the Water Pressure Switch........28

7.6 TemperatureRise ......................................29

SECTION 8. Maintenance

8.1 WaterChemistry .......................................30

8.2 SeasonalCare ..........................................30

8.2.1 SpringandFallOperation..........................30

8.2.2 Winterizing................................................30

8.2.3 SpringStart-up..........................................31

8.3 InspectionandService ..............................31

8.3.1 OwnerInspection ......................................31

8.3.2 ProfessionalInspection .............................32

SECTION 9. Troubleshooting

9.1 GeneralHeaterTroubleshootingGuide ......32

9.2 ServiceCodes ...........................................33

9.3 IgnitionControlLEDServiceCodes ...........33

SECTION 10. Professional Maintenance

and Service

10.1 GeneralInformation ...................................36

10.2 "Premix"InducedDraft

Combustion System ..............................36

10.3 SpecialServiceIssues

Premix Combustion System ..................37

10.3.1 SystemOperation .....................................37

10.3.2 FieldServiceandAdjustment ....................37

10.4 HeaterComponentsandTheirOperation ...38

10.5 ElectricalTroubleShooting........................38

10.5.1 ElectricalPower Supply ............................39

10.5.2 Controller ..................................................39

10.5.3 ControlCircuitTroubleShooting ................39

10.5.3.1 Transformer ...............................................40

10.5.3.2 Fuse .........................................................40

10.5.3.3 WaterPressure Switch/External Interlock

or Fireman Switch Circuit.....................40

10.5.3.4 TemperatureLimitSwitchesCircuit ...........40

10.5.3.5 Fusible Link/Manual Reset Limit Switch

Circuit..................................................41

10.5.3.6 BlowerPressureSwitch Circuit .................41

10.5.3.7 GasValveVoltage ....................................42

10.5.3.8 Igniter/IgnitionControlCircuit.....................42

SECTION 11. Replacement Parts

11.1 OrderingInformation ..................................46

11.2 Parts List ..................................................47

11.3 GeneralExplodedView .............................48

11.4 DetailedExplodedView ............................49

Warranty .....................................BackCover

LX and LT Low NOx Pool/Spa Heater Page1

SECTION 1.

General Information

1.1 Introduction

This manual provides installation and operation

instructions for the LX and LT Low NOx pool and

spa heaters. Read these installation and operation

instructions completely before proceeding with the

installation. Consult the Jandy factory, or local

factory representative, with any questions regarding

this equipment.

Certain sections of this manual are specific to

either United States or Canadian installations, and are

labeled as such.

The LX and LT Low NOx heaters get their

electrical power from an external 115VAC or

230VAC source and provide a dual electronic thermo-

stat control system for pool/spa combinations or

preheat convenience.

The LX and LT Low NOx heaters are specifi-

cally designed for heating fresh water swimming pools

and spas, and with proper installation and care, they

will provide years of reliable service. Do not use the

heater to maintain pool or spa water temperature

below 70°F. Do not use it as a heating boiler or

general service water heater or to heat salt water.

Consult your dealer for the appropriate Jandy products

for these applications.

In the LX and LT heaters, low NOx operation is

achieved through use of a special “premix” combustion

system. The operation of this type of system is af-

fected by fuel gas properties. As noted in the trouble-

shooting and maintenance sections of this manual,

adjustments may be necessary if the local gas supply is

of especially high or low heat content.

1.2 Consumer Information and Safety

The LX and LT Low NOx heaters are designed

and manufactured to provide many years of safe and

reliable service when installed, operated and main-

tained according to the information in this manual and

the installation codes referred to in later sections.

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.

1.2.1 Spa/Hot Tub Safety Rules

WARNING

The following “Safety Rules for Hot Tubs,”

recommended by the U.S. Consumer Product

Safety Commission, should be observed when

using the spa.

AVERTISSEMENT

Les Règlements suivants pour Cuves

Thermales, tel que recommandés par la

Commission U.S. de Sécurité des Produits

pour les Consommateurs, devraient être

respectés lors de l’utilisation du spa.

WARNING

The U.S. Consumer Product Safety

Commission warns that elevated water

temperature can be hazardous. Consult heater

operation and installation instructions for water

temperature guidelines before setting

temperature.

AVERTISSEMENT

La U.S. Consumer Product Safety Commission

indique que des températures de l'eau élevées

peuvent être dangereuses. Voir la notice

d'installation et de fonctionnement pour le

réglage de la température.

1. Spa or hot tub water temperature should never

exceed 104°F (40°C). One hundred degrees

Fahrenheit (100°F [38°C]) is considered safe for

a healthy adult. Special caution is recommended

foryoungchildren.

2. The drinking of alcoholic beverages before or

during spa or hot tub use can cause drowsiness

which could lead to unconsciousness, and

subsequentlyresultindrowning.

3. Pregnant women take note! Soaking in water

above 102°F (38.5°C) can cause fetal damage

during the first three months of pregnancy (which

could result in the birth of a brain-damaged or

deformed child). If pregnant women are going to

use a spa or hot tub, they should make sure the

water temperature is below 100°F (38°C)

maximum.

4. The water temperature should always be

checked with an accurate thermometer before

entering a spa or hot tub. Temperature controls

may vary by as much as 1F° (1C°).

5. Persons with a medical history of heart disease,

diabetes, circulatory or blood pressure problems

should consult their physician before using a hot

tub or spa.

6. Persons taking any medication which induces

drowsiness(e.g.,tranquilizers,antihistamines,or

anticoagulants) should not use spas or hot tubs.

7. Prolonged immersion in hot water can induce

hyperthermia.

Page2

Hyperthermia occurs when the internal body

temperature reaches a level several degrees above the

normal body temperature of 98.6°F (37°C). Symptoms

includedizziness,fainting,drowsiness,lethargy,andan

increase in the internal body temperature. The effects

ofhyperthermiainclude:

• Lack of awareness of impending hazard

• Failure to perceive heat

• Failure to recognize need to leave spa

• Physicalinability to leavespa

• Fetal damage in pregnant women

• Unconsciousness resulting in a danger of

drowning

1.2.2 Swimming Pool Energy Saving Tips

Waterpik Technologies offers the following

recommendations to help conserve fuel and minimize

the cost of operating your pool heater without

sacrificing comfort.

1. The American Red Cross recommends a maxi-

mum water temperature of 78°F (25°C). Use an

accurate pool thermometer. A difference of 4F°

(2°C) , between 78°F and 82°F (26°C and 28°C),

will use as much as 40% more gas.

2. Carefully monitor the water temperature of your

pool in the summertime. You can reduce heater

usage due to warmer air temperatures.

3. Find the proper setting on the pool heater

temperature control and use the locking ring to

discourage further adjustments. (LT only).

4. Set the pump time clock to start the pump no

earlier than 6:00 AM during the pool heating

season. This is the time when nightly heat loss

balances.

5. If the pool is only going to be used on weekends,

reduce the heater temperature control setting by

8 or 10 degrees during the week. Reset it to the

78°F (25°C) level a day or so before you plan to

use the pool.

6. During the winter or when on vacation for longer

than a week, shut down the heater by following

the shutdown instructions found on the inside of

the heater.

7. Where possible, shelter the pool from prevailing

winds with well-trimmed hedges or other land-

scaping, cabanas, or fencing.

8. Always use a pool cover when practical. Besides

providing a valuable safety feature, a pool cover

will reduce heat loss, conserve chemicals, and

reduce the load on filter systems.

1.3 Warranty

The LX and LT Low NOx heaters are sold with

a limited factory warranty. Details are specified on the

back cover of this manual.

Make all warranty claims to an authorized Jandy

representative or directly to the factory. Claims must

include the heater serial number and model (this

information can be found on the rating plate), installa-

tion date, and name of the installer. Shipping costs are

not included in the warranty coverage.

The warranty does NOT cover damage caused

byimproperassembly,installation,operationorfield

modification. Also, damage to the heat exchanger by

corrosive water is NOT covered by the warranty. See

Section 8.1 for maintaining proper pool water chemis-

try.

NOTE: Keep this manual in a safe place for

future reference when inspecting or servicing

the heater.

1.4 Codes and Standards

The LX and LT Low-NOx pool and spa heaters

are design certified by CSA (Canadian Standards

Association) as complying with the latest edition of the

"Standard for Gas Fired Pool Heaters", ANSI Z21.56

in the USA and CAN-4.7 in Canada.

All Jandy heaters must be installed in accordance

with the local building and installation codes as per the

utilityorauthoritieshavingjurisdiction.Alllocalcodes

take precedence over national codes.

In the absence of local codes, refer to the latest

editionofthefollowingnationalcodesforinstallation:

1. In the United States, "The National Fuel and Gas

Code", NFPA 54/ANSI Z223.1. Specifically,

refer to Part 7, "Venting of Equipment".

2. In Canada, "Natural Gas and Propane Installation

Code", CAN/CSA-B149.1.

The LX and LT Low NOx pool and spa heaters

exceed the requirements of energy conservation

regulations such as those in California, Hawaii, New

York, Oregon and other states which require that a

pool heater have intermittent ignition. In addition, the

natural gas models of this heater comply with both the

California South Coast Air Quality Management

District's (SCAQMD) rule 1146.2 and the Title 30,

Texas Administrative Code, Chapter 117, Section

117.465 for Nitrogen Oxide (NOx) emissions.

LX and LT Low NOx Pool/Spa Heater Page3

Any changes to the heater, gas controls, gas

orifices,wiring,draftdiverter,orimproperinstallation

may void the warranty. If change is required to any of

the above, consult the factory.

1.5 Technical Assistance

Consult Waterpik Technologies or your local

Jandy distributor with any questions or problems

involvingthespecifications,installation,andoperation

of your Jandy equipment. An experienced technical

support staff is ready to assist you in assuring the

proper performance and application of Jandy products.

For technical support call the Technical Service

Department at (707) 776-8200 extension 260.

1.6 MaterialsInstaller Must Provide

1.6.1 Materials for All Applications

The following items are needed and are to be

supplied by the installer for all LX/LT Low NOx

heater installations:

1. The correct size gas pipe to supply gas from the

meter to the heater (see Section 4.1 ).

2. A manually operated gas valve to be installed in

the gas line outside of the heater jacket.

3. A suitable gas union joint to connect the heater to

the gas line outside of the heater.

4. Plumbing items needed to provide a sediment

trap (drip leg) in the gas line between the manual

gas valve and the heater (see Section 4.1).

5. A 115V AC or 230V AC power supply. A

junction box is not needed at the heater, connec-

tions are made inside of the heater jacket.

1.6.2 Materials for Special Applications

In addition to the items listed above, the follow-

ing items are needed for special applications.

1. A factory authorized vent collar and any vent

pipe needed for indoor installations in the USA

and outdoor shelter installations in Canada (see

Section 3.3.2). Vent collars are available from

anyJandydistributor.

2. Primer and cement suitable for cementing CPVC

pipe to PVC pipe and an appropriate coupling for

connecting the factory supplied CPVC pipe

nipplestoPVCpoolplumbing.

3. Anoncombustibleplatform forinstallationon

combustible surfaces (see Section 2.3.3). Non

combustible bases are available from your Jandy

distributor.

1.7 Specifications

1.7.1 General Specifications

1. InstallationLocation:

Certified for use:

In the USA:

NaturalGas: Indoor and Outdoor

LP: Indoor and Outdoor

In Canada:

Natural Gas : Outdoor and Outdoor

Shelter

LP: Outdoor and Outdoor

Shelter

2. MinimumClearanceFromCombustibleMaterial:

See Table 2 in Section 2.3.2

3. *Gas Pipe/Heater Gas Valve Connection:

NaturalGas: 3/4" NPT

LP: 3/4" NPT

*For diameter of gas line from meter to heater see

Table 5 in Section 4.1.

4. Supply Gas Type:

Certified for use with:

Natural gas and LP

5. Inlet Gas Supply Pressure:

Minimum Maximum

Natural Gas: 5.0 "WC 10.5"WC

LP: 10.0"WC 14.0"WC

6. Water Pipe/Heater Connection:

*2" Unthreaded PVC or CPVC

*Other size pipes may be used. See Section

5.5 for details

7. Water Flow Rate:

Maximum: 125gpm (475 lpm)

Minimum: 30 gpm (110 lpm)

8. Working Water Pressure:

Maximum: 75psi

9. Exhaust Vent Connection Size:

Model:

250 7"Diameter

400 9"Diameter

10. ElectricalSupply:

Either 115 Volts AC or 230 Volts AC.

11. Modification of Heater for High Altitude:

LX and LT Low-NOx are normally shipped

from the factory in the low altitude (sea level)

operational configuration. When requested, the

heaters can be configured and shipped for higher

altitudes. For field conversions to change altitude

configurations,manifoldkitsformidaltitudesand

Page4

high altitudes are available from your Jandy pool

products dealer or by contacting the Customer

Service Department at 707.776.8200 extension

245. See Section 11, "Parts List", of this manual

for the correct kit number for the manifold

assembly needed for your altitude. Table 1

defines the altitude designations as described by

the "Standard for Gas Fired Pool Heaters", ANSI

Z21.56 in the United States and "Gas-Fired

Appliances For Use At High Altitudes", CAN1-

2.17 in Canada.

1.7.2 Dimensions

See Figure 1 for a diagram showing the heater's

exteriordimensions and dimensions to critical connec-

tions on the heater.

Figure1.GeneralConfiguration

* Values shown are for both LX and LT models.

Heater Width

Model* Dim "A" Heater Depth Heater Height Vent Diameter FiringRate

in (cm) in (cm) in (cm) in (cm) BTU/HR (kcal)

250-L 28 1/4 (72) 27 1/8 (69) 30 7/8 (78) 7 (18) 250,000 63

400-L 34 1/4 (87) 27 1/8 (69) 30 7/8 (78) 9 (23) 400,000 101

Table 1. Altitude Designations For The LX/LT Heaters

ALTITUDE UNITED CANADA

DESIGNATION STATES

LOWALTITUDE 0-3000FT 0-2000FT

(0-610 m)

MIDALTITUDE 3001-6000FT 2001-4500FT

(611-1370m)

HIGH ALTITUDE 6001-10,000FT NOT

APPLICABLE

LOWALTITUDE 0-5000FT 0-4500FT

(0-1370m)

HIGH ALTITUDE 5001-10,000FT NOT

APPLICABLE

NATURALGAS

LX and LT Low NOx Pool/Spa Heater Page5

SECTION 2.

Installation Instructions

2.1 Introduction

WARNING

Improper installation or maintenance can cause

nausea or asphyxiation from carbon monoxide

in flue gases which could result in severe injury,

or death. For indoor installations, as an

additional measure of safety, Waterpik

Technologies strongly recommends installation

of suitable Carbon Monoxide detectors in the

vicinity of this appliance and in any adjacent

occupied spaces.

AVERTISSEMENT

Une installation ou un entretien inadéquat peut

causer la nausée ou l’asphyxie en raison du

monoxyde de carbone présent dans les gaz de

combustion et même entraîner des blessures

graves ou la mort. Pour les installations

intérieures, comme mesure de sécurité

additionnelle,WaterpikTechonologies

recommande fortement l’installation de

détecteurs de monoxyde de carbone près de

cet appareil ainsi que dans les espaces

adjacents occupés.

Install the LX and LT Low NOx heaters and

vent collars in accordance with the procedures in this

manual, local codes and ordinances, and in accordance

with the latest edition of the appropriate national code

(see Section 1.4 "Codes and Standards").

All gas-fired products require correct installation

to assure safe operation. The requirements for pool

heatersincludethefollowing:

1. Fieldassembly (ifrequired)

2. Appropriate site location (clearances) and

flooring

3. Sufficientcombustionandventilationair

4. Properly sized gas meter and piping

5. Proper electrical wiring (if required)

6. Adequate water flow

This manual provides the information needed to

meet these requirements. Review all application and

installationprocedurescompletelybeforecontinuing

theinstallation.

2.2 Field Assembly

The LX and LT Low NOx heaters can be

installed in a variety of ways, some of them requiring

preparation or assembly in the field. The heater is

shipped from the factory with an exhaust vent config-

ured for an outdoor installation. The LX and LT Low

NOx heaters are also design certified for "Indoor"

installations in the United States and "Outdoor Shelter"

installations in Canada when equipped with a vent

collar and the appropriately sized exhaust vent.

Check the rating plate on the heater or the Parts

List (Section 11.2) of this manual for the correct Jandy

vent collar part number. For specific installation

information see Section 2.3.5 "Indoor and Outdoor

ShelterInstallations".

Water connections are provided on the right side

of the heater but can be changed to the left side by

reversal of the heat exchanger. It is best to handle

these preparations before the heater is installed in its

final location. See Section 5.4 "Reversible Water

Connections"of this manual for instructions.

2.3 Location Requirements

2.3.1 Introduction

CAUTION

When pool equipment is located below the pool

surface, a leak from any component can cause

large scale water loss or flooding. Waterpik

Technologies cannot be responsible for such

water loss or flooding or resulting damage.

ATTENTION

Lorsque l’équipement d’une piscine est situé

sous la surface de l’eau, une fuite provenant de

n’importe quel élément peut causer une perte

d’eau importante ou une inondation. Waterpik

Technologies n’est pas responsable des pertes

d’eau, des inondations ou des avaries causées

par une installation ou un entretien inadéquat.

The LX and LT Low NOx heaters may be

installed indoors or outdoors as outlined in later sec-

tions. Location of the heater below or above the pool

water level affects operation of its water pressure

switch. See sections on water piping and heater start-

up for more information about this.

Avoid placing the heater in locations where it can

cause damage by water or condensate leakage. If this

is not possible, provide a suitable drain pan to catch

and divert any leakage. The pan must not restrict the

air flow around the heater.

All criteria given in the following sections reflect

minimum clearances as stated in the national stan-

dards. However, each installation must also be evalu-

ated,taking intoaccount theprevailing localconditions

such as wind speed and direction, proximity and height

ofwalls thatmay blockventilation, and proximityto

public access areas.

2.3.2 Clearances

The heater must be placed to provide clearances

on all sides for maintenance and inspection. There

must also be minimum distances maintained from

combustible surfaces (see Table 2).

At least 18" (457mm) access must be available in

front of the heater for burner removal and access to

theigniter.

If the heater is to be installed in a garage, or

Page6

similarstructure,all burnersandburner ignition

devices must have a minimum 18" (457mm) clearance

above the floor.

This heater must be installed at least 5 feet

(1.52m) from the inside wall of a pool unless the

heater is separated from the pool by a solid fence, wall

or other permanent solid barrier.

Ce chauffe-piscine doit être installé á au moins 5

pieds (1.52m) de la paroi interne de la piscine à moins

d'être isolé de la piscine par une clôture, un mur ou

autre barrière permanente.

2.3.3 Flooring

The heater must be installed on a level surface

of noncombustible construction or on fire-resistant

slabs or arches. Noncombustible flooring is defined as

flooring material and surface finish not capable of

beingignitedandburningandwithnocombustible

materials against the underside. Acceptable materials

are those consisting entirely of a combination of steel,

iron, brick, tile, concrete, slate, glass or plaster. Do not

install the heater directly on a combustible wood or

carpetfloorwithout placinga noncombustibleplatform

between the floor and the heater.

The heater can be installed on a combustible

floorifanoncombustible base assembly, available

from Jandy, is used. See the heater rating plate or the

Parts List (Section 11) of this manual for the appropri-

ate base part number. Heaters must never be

installed directly on carpeting.

As an alternative to the Jandy noncombustible

base plate, in the United States, the National Fuel Gas

Code (NFPA 54 / ANSI Z223.1), and in Canada, the

Natural Gas and Propane Installation Code (CAN/

CSA-B149.1), allow a heater to be placed on a

combustible surface when there is a platform under

the heater made of hollow masonry no less than 4

inches (102 millimeters [mm]) thick, covered with

sheet metal at least 24 gauge thick and extending

beyond the full width and depth of the heater by at

least 6 inches (153 mm) in all directions. The masonry

must be laid with ends unsealed, and joints matched to

provide free circulation of air from side to side through

the masonry (see Figure 2). If the heater is installed in

a carpeted alcove, the entire floor of the alcove must

be covered by a noncombustible panel.

2.3.4 Outdoor Installation

The LX or LT Low NOx heaters can be installed

in the outdoor configuration as received from the

factory.

Locate the heater in an open, unroofed area. Do

not install the heater under a deck. Do not locate the

heater below or adjacent to any doors, glass openings,

louvers, grills, etc., which connect in any way with an

inhabited area of a building, even though the access

might be through another structure (e.g., a garage or

Table 2. Minimum Heater Clearances From Combustible Surfaces

Table 2. Dégagements Minimaux à Assurer Entre les Parois de L'appareil et les Constructions Combustibles

Note: Clearances listed inTable 2 are

manufacturer's tested values. These are

given as minimum values. Where local

and national codes apply, and values are

different than those listed in Table 2,

use the greater value to ensure safe

operation.

SIDEOF INDOOR(OUTDOORSHELTER) OUTDOORINSTALLATION

HEATER INSTALLATION

INCHES CENTIMETERS INCHES CENTIMETERS

BLANK 4 10.2 4 10.2

REAR 4 10.2 4 10.2

PIPING 12 30.5 12 30.5

TOP 39 99.0 OPENUNROOFEDAREA

FRONT 18* 45.7 18* 45.7 *InCanada -24in(61cm)

Figure2. Non-CombustiblePlatform

Notes:

1. Blocksmustprovideasolidbase and bebracedso they

cannot slip out of place.

2. Air openings in blocks must be arranged to provide

unrestricted opening through entire width or length of

base.

3. Sheet metal must be at least 24 ga. and extend 6"

beyond the heater jacket on all sides.

LX and LT Low NOx Pool/Spa Heater Page7

utility room). In the United States there must be a

minimum of four (4) feet (1.22 m) horizontally and

four (4) feet (1.22 m) vertically between the heater

exhaust point and any door, glass opening, or gravity

inlet to a building. In Canada, the heater must be

installed so that the exhaust point of the heater is at

least ten (10) feet (3.0 m) from any building opening

(see Figure 3).

WARNING

United States

Do not install the heater with the top of the vent

assembly within 4 feet (1.22 m) horizontally and

4 feet (1.22 m) vertically of any opening into a

building.

Canada

Do not install the heater with the top of the vent

assembly within 10 feet (3.05 m) of any

openingintoabuilding.

AVERTISSEMENT

Lorsque vous installez l’appareil de chauffage,

assurez-vous que l’ouverture d’aération se

trouve à un minimum de 10 pieds (3,05 m) de

toute ouverture d’un bâtiment.

The top surface of the heater must be at least

three(3) feet above any forced air inlet, or intake ducts

locatedwithinten(10)feet horizontally.

If the heater is installed under an overhang, there

must be a minimum clearance of 5 feet (1.5 m) above

the top of the heater and the structure should not

overhang the heater more than 12 inches (0.30m). The

area under the overhang must be open on three sides.

This prevents combustion gases from being diverted into

livingareasthroughdoors,windows,orgravityinlets.

Figure 3. Outdoor Heater Installation

Ne pas installer ce chauffe-piscine sous une

saillie mesurant moins de 3 pi de hauteur. La partie

sous la saillie doit être ouverte sur 3 côtés.

If the heater is installed close to a structure,

protect it from rain water runoff with rain gutters on

the roof or other measures. Do not locate the heater

near irrigation sprinkler systems that could spray

water on it. Water from sprinklers may cause damage

to controls and electronic components.

Avoid locations where wind deflection off

nearby structures might cause downdraft conditions.

Where downdraft conditions exist, locate the heater at

least 3 feet (0.91 m) from vertical surfaces (e.g.,

nearbybuildingsandwalls).

In Florida it is required that the heater be se-

curely fastened to the equipment pad. Use a size

1/4" x 1-1/2" long stainless steel Tapcon® type con-

crete screws and washers at each of the four tabs

located at the base of the heater. Mounting the

appliance in this manner meets the applicable require-

ments of the Florida Building Code.

Mounting screws are not provided with this

heater. After placing the heater on the equipment pad,

drill a hole in the concrete at each of the four tabs on

the feet of the heater. (The correct size drill bit is

usually provided with the concrete screws when

purchased). Place a screw in each of the holes and

fasten the heater to the equipment pad (see Figure 4).

Do not over torque the screws.

Figure 4. Anchor Heater To Equipment Pad

2.3.5 Indoor and Outdoor Shelter

Installations

An outdoor shelter (Canada only) is an unoccu-

pied enclosure which does not communicate directly

with occupied areas. All indoor installations and

outdoor shelter installations require the addition of a

factory approved vent collar. The vent collar must be

installedwithoutmodification andin accordancewith

the instructions provided by the manufacturer.

Page8

Une remise extérieure (au Canada seulement)

est un endroit inoccupé qui ne communique pas

directement avec les endroits occupés. Toutes les

installations intérieures et remises extérieures exigent

l’addition d’une cheminée approuvée par le

manufacturier. La cheminée doit être installée sans

aucune modification et selon les exigences fournies

par le manufacturier.

These codes, standards and Waterpik Technolo-

gies require that the heater be properly vented as

outlinedinthis manual. Proper ventilation of exhaust

and combustion air are essential for the safe and

efficient operation of the heater (See Section 3).

2.3.5.1 Converting the Grill to a Vent

Collar

If the LX or LT Low NOx is to be installed

either indoors or in an outdoor shelter, its exhaust

discharge grill must be converted to a collar for vent

pipe connection. The necessary vent collar, gasket and

screws can be ordered as parts kit R0331403 for

model 250 or R0331405 for model 400 (see parts list in

Section 11 of this manual). The conversion can be

donequitesimplyasfollows:

1. Remove the vent exhaust grill by removing the

four screws which retain it. The grill and the

screws may be discarded (See Figure 5).

2. Replace the grill with the vent collar. Place the

vent collar and gasket over the hole and fasten it

in place with the 4 screws provided. Be sure that

all components are properly aligned

(See Figure 6).

3. Install the vent pipe on the indoor vent collar. The

collarwillaccommodateventpipingofnominal7"

or 9" diameter (see Table 4), depending upon the

model of your heater (See Figure 7). See vent

installationsectionforimportantinformationon

selecting proper pipe size.

SECTION 3.

Venting

3.1 Combustion Air Supply

The heater location must provide sufficient air

supply for proper combustion and ventilation of the

surrounding area as outlined in the latest edition of

ANSI standard Z223.1 or in Canada, CAN/CSA-

B149.1, and any local codes that may be applicable.

In general, these requirements specify that the

room in which a heater is installed should be provided

with two permanent air supply openings; one within 12

inches (305mm) of the ceiling, the other within 12

inches(305mm)ofthefloor. Allindoorinstallations

must have openings to outside air for combustion,

ventilation,and dilutionofflue gasesfrom inside the

building (see Figure 7 and Table 3). Waterpik Tech-

nologiesdoesnotrecommendindoorinstallationsthat

donot provide combustion air from outside the build-

ing. Alloutdoorshelterinstallations(Canada only)

must have uninterrupted openings to outside air for

combustionandventilation.Theinstallationmustbein

accordance with the latest edition of CAN/CSA B149.

Waterpik Technologies does not recommend outdoor

shelter installations that depend on internal air for

combustion. Combustion air should be ducted to the

heater from outside the structure.

Figure7.VentPipeInstallation

Figure5. RemovalofOutdoorExhaustGrill

OUTDOOR

VENT GRILL

Figure6. VentCollarAssemblyforIndoorandOutdoor

ShelterInstallation

INDOOR

VENT

COLLAR

GASKET

LX and LT Low NOx Pool/Spa Heater Page9

The information in Table 3 is not applicable in

installations where exhaust fans or blowers of any type

are used. Such installations must be designed by

qualifiedengineers.

The heater must be completely isolated and

protected from any source of corrosive chemical

fumes such as those emitted by trichlorethylene,

perchloroethylene,chlorine,etc.

WARNING

Do not store any chemicals, cleaners, or other

corrosive material near combustion air

openings or in the room. Avoid locating

appliance vents in the vicinity of combustion air

openings. Failure to prevent corrosive materials

from mixing with combustion air can result in

reduced heater life and unsafe heater

operation.

AVERTISSEMENT

Ne pas entreposer ni utiliser d'essence ni

d'autres vapeurs ou liquides inflammables à

proximité de cet appareil ou de tout autre

appareil.

3.2 Exhaust Venting

When converted to indoor and outdoor shelter

venting configuration, the LX and LT Low NOx

heaters have a vent collar fitting. The diameter of the

vent collar and, thus, the minimum diameter of the vent

pipe to be used is determined by the model of heater

installed. The only correct procedure for vent pipe

sizing is to do so in accordance with Table 4 and

the applicable installation code as stated in the

following "Danger" warning.

Table 3. Air Openings to Outside

Required Net Free Open Area*

for Combustion Air Openings

Direct from outside Duct from outside

Model in2(cm2)in

2(cm2)

250-L 63 (406) 126 (813)

400-L 100 (645) 200 (1290)

*Area indicated is for one of two openings; one at floor level

and one at the ceiling, so the total net free area would be double

the figures indicated. For special conditions, refer to NFPA54

ANSI Z223.1. In Canada refer to the National Standard CAN/

CSA-B149.1 which differs from this table.

Note: If using screens and/or metal louvers, compensate by adding

50% additional area to each opening

If using wood louvers each opening must be at least four times

the area indicated in the table above.

Outside Air Supply: When combustion air is

supplieddirectlythroughanoutside wall,each opening

should have a minimum free area of one square inch

per 4,000 BTU/h (1.2kW) input of the total input rating

of all appliances in the enclosed area. If air is provided

through horizontal ducts, each opening and duct must

provide one square inch of flow area for each 2000

BTU/h (0.6 kW). These requirements are summarized

in Table 3. Note that the areas specified are net free

areas and should be increased when the openings are

covered by screens, louvers, grills or other protective

covers (see Figure 8 and Table 3 notes).

Note: In Canada, follow Canadian Standard,

CAN/CSA-B149.1 or local codes.

Exhaust Fans or Vents: Any equipment which

exhausts air from the room where the heater is

installed can deplete the combustion air supply or

reverse the natural draft action of the venting system.

This could cause flue products to accumulate in the

room. Additional air must be supplied to compensate

for such exhaust.

Notes:

1. Use approved

roof jack.

Figure8. IndoorInstallationVenting(USA),or OutdoorShelter(Canada)

Page10

WARNING

Vent pipe diameter must be as required by the

National fuel Gas Code Z223.1 or the Canadian

Installation Codes for Gas Appliances CAN/

CSA-B149.1. Undersize pipe can result in

inadequate venting and oversize pipe can result

in vent condensation. In either case the result

can be release of combustion products to the

indoors. This can cause serious injury or death

by carbon monoxide poisoning or asphyxiation.

AVERTISSEMENT

Le diamètre des tuyaux de ventilation doit

répondre aux exigences du National Fuel Gas

Code Z223.1 ou du code canadien des

installations des appareils à gaz CAN/CSA

B149.1. Des tuyaux trop petits risquent

d’entraînerune ventilationinadéquate etdes

tuyaux trop gros risquent de provoquer une

condensation dans les tuyaux. Dans un cas

comme dans l’autre, des produits de

combustion risquent de s’échapper dans le

bâtiment et causer des blessures graves ou

l’asphyxie par le monoxyde de carbone.

3.3 Vent Pipe Sizing and General

Installation

As part of their certification, the LX and LT Low

NOx heaters have been determined to be a Category 1

Fan-Assisted appliance. They are intended for stan-

dard vertical venting per tables provided in most local

codes for Category 1 Fan-Assisted appliances. If the

local code does not include such tables, refer to the

National Fuel Gas Code NFPA 54 / ANSI Z223.1 or

the Canadian Installation Codes for Gas Appliances

CAN/CSA-B149.1. Note that the tables for fan-

assistedappliancesinclude bothmaximumandmini-

mum vent loading figures. The primary purpose of the

maximum ratings are to assure that the vent operates

with negative pressure throughout its length. The

minimum ratings are to assure that vent gases don’t

cool too much and thereby assure that condensation

doesn’t occur.

3.3.1 Outdoor Installations

Foroutdoorinstallations,exhaustventingconsid-

erations will determine the placement of the heater

(See Section 2.3.4). If the heater cannot be placed so

as to meet the requirements stated in Section 2.3.4, a

vent collar may be added to the heater to move the

exhaust vent opening to a position that complies with

the requirements. In all cases, vent collars must be of

the same diameter as the exhaust outlet of the heater.

Approved vent collars may be obtained through your

Jandydistributor.

3.3.2 Indoor and Outdoor Shelter

Installations

Allindoorinstallations andoutdoorshelter

installations require the addition of a factory approved

vent collar. The vent collar must be installed without

modification.

All vent installations must be made in accor-

dance with all local, state or provincial codes and with:

1. Chapter 7, " Venting of Equipment" of the

national Fuel Gas Code, ANSI 223.1 latest

edition,or theapplicable provisionsof thelocal

buildingcodes.

2 In Canada, CAN/CSA B149.1.

Avoid terminating heater vents near air condi-

tioning or air supply fans. The fans can pick up

exhaust flue products from the heater and return them

insidethe building,creating a possiblehealth hazard.

Do not locate the vent terminal where flue

productscouldstrike againstbuilding materialsand

cause degradation.

Vent opening should be well away from trees or

other obstructions that would prevent free air flow to

and from vent terminal. Do not terminate the vent

under decks, stairways, or car ports.

Be sure to support all venting so that connections

will not separate and so that the weight of the vent

pipe does not rest on the heater vent collar. All

connections should be made with rustproof sheet

metal screws. Do not weld or fasten the vent pipe to

the heater vent collar. The vent collar and heater top

must be easily removable for normal heater service

andinspection.

The vent collar outlet is to be connected to an

unobstructed vent pipe of the same diameter, terminat-

ing outside the building. The vent must terminate at

least two (2) feet (0.6 m) above the highest point of

the roof or other object that is within ten (10) feet (3.0

m) of the vent termination. The vent pipe must have a

listed vent cap which allows a full equivalent opening

for flue products (see Figure 7).

Type “B” double wall or equivalent vent pipe is

recommended. However, single wall metal vent pipe

may be used as specified in the latest edition of the

National Fuel Gas Code ANSI Z 223.1 or in Canada

CAN/CSA-B149.1.

IMPORTANT NOTE: Do not use sheet metal

screws at the snap lock joints of Type B gas

vents.

Whenventingmultipleappliancesthroughone

common duct, each appliance must have it's own vent

temperature limit switch. All vent limit switches must

be wired in series so as to prevent any appliance from

firing in the event of a blocked vent. Refer to ANSI

Z223.1 or, in Canada, to CAN/CSA B149.1 for more

informationonmultipleventing.

Table 4. Vent Pipe Sizing Table

LX/LT VentPipeDiameter

Low NOx

Model inch cm

250-L 7.0 17.8

400-L 9.0 22.9

LX and LT Low NOx Pool/Spa Heater Page11

correct part number of the manifold kit needed.

When changing the altitude range of the heater,

be sure to fill out the altitude conversion label,

included in the kit. Apply the label on the inner

panel of the heater, next to the original rating

plate.

CAUTION

Permanent damage to the gas valve will occur

if the following procedures are not followed.

ATTENTION

Vous endommagerez la soupape de gaz si

vous ne respectez pas les procédures

suivantes.

3. Use the figures in Table 5 to size the gas inlet

piping from the gas meter to the heater. Check

alllocal codes for compliance before installing

the heater.

3.3.3 Inspection and Replacement of

Existing Vent System with New

Components

If the LX/LT is being installed to replace an

existing pool heater, it is recommended that a new

appropriate venting system be installed with the new

heater. However, if an existing venting system must be

used, be sure to carefully inspect the venting system to

ensure that it is in good condition and continues to be

appropriate for the LX/LT heater. Replace any parts

that are not in good and serviceable condition with new

parts before completing the pool heater installation.

SECTION 4.

Gas Connections

4.1 Gas Supply and Piping

Review the following general instructions before

continuingtheinstallation.

WARNING

The LX and LT Low-NOx pool and spa heaters

are designed for use with either natural gas or

LP gas. Check the rating plate on the inner

panel to be sure that the heater is designed to

use the type of gas being supplied. DO NOT

ATTEMPT TO CONVERT THIS HEATER

FOR USE WITH ANY OTHER TYPE OF

FUEL.

AVERTISSEMENT

Les appareils de chauffage à faibles émissions

NOx LX et LT pour piscines et cuves thermales

sont conçus pour être utilisés avec du gaz

naturel ou du gaz de pétrole liquéfié (GPL).

Vérifiez l’information inscrite sur la plaque

signalétique du panneau intérieur pour vous

assurer que l’appareil est conçu pour le type de

gaz fourni. NE PAS ESSAYER DE

CONVERTIR CET APPAREIL À UN AUTRE

TYPE DE GAZ.

1. Gas piping installation must be in accordance

with the latest edition of ANSI Z223.1 and all

local codes. In Canada, the installation must be in

accordance with CAN/CSA B149.1 and all local

codes that apply.

2. Check the gas supply to be sure that it is the

same as the gas indicated on the heater's rating

plate. LX and LT Low NOx heaters, as shipped

from the factory, are certified to operate within

the altitude range indicated on the rating plate. If

a field conversion to a different altitude range

should be necessary, manifold kits are available

for changing the altitude range of the heater. See

Table 1 on page 4 of this manual to determine the

correct altitude designation for your heater.

Refer to Section 11 "Parts List" to order the

Table 5. Supply Gas Pipe Size Requirements*

Distance from Gas Meter

0-50 feet 50-100 feet 100-200 feet

Heater (0-15 m) (15-30 m) (30-60 m)

Size in. (mm) in. (mm) in. (mm)

250 1 (25) 1-1/4 (32) 1-1/4 (32)

400 1-1/4 (32) 1-1/2 (38) 1-1/2 (38)

Notes:

1. Thesenumbersare for naturalgas(0.65Sp.Gr.)and are

based on 1/2 inch (3.45 kPa) water column pressure

drop. Check supply pressure with a manometer, and

local code requirements for variations. For LP gas,

reduce pipe diameter by one size, but maintain a

minimum 3/4 " diameter.

2. Check supply pressure and local code requirements

before proceeding with work.

3. Pipe fittings must be considered when determining gas

pipe sizing.

Figure 9. Proper Design for a Sediment Trap/Drip Leg

APPROVED

4. Install a sediment trap (drip leg) ahead of the gas

controls (see Figure 9). Fit the trap with a

threaded cap which can be removed for cleaning.

Page12

5. Install a manual gas shutoff valve for service and

safety. Do not use a restrictive gas cock. DO

NOT USE FLEXIBLE GAS PIPING, it will

restrict the gas flow to the heater.

6. Disconnect the heater and its individual shutoff

valve from the gas supply system during pressure

testing of the system at pressures higher than 1/2

pounds per square inch (psi) (3.45 kilopascals

[kPa]). If the test pressure is equal to or less

than 1/2 psi (3.45 kPa), close the manual shutoff

valve on the heater during the piping pressure

test.

7. If the gas supply pressure is less than required,

check for undersized pipe between the meter and

the heater, a restrictive fitting, or an undersized

gas meter. Gas supply pressures to the heater

are listed in Table 6.

9. Before operating the heater, test the complete

gas supply system and all connections for leaks

using a soap solution. Do not use an open flame.

CAUTION

Some leak test solutions (including soap and

water) may cause corrosion or stress cracking.

Rinse the piping with water after testing.

ATTENTION

Certaines solutions d’essai d’étanchéité (y

compris l’eau et le savon) peuvent causer de la

corrosion ou de la fissuration. Rincez les

tuyaux à l’eau après l’essai d’étanchéité.

4.2 Manifold Pressure

Confirm that gas supply pressure is correct. If

the gas supply pressure is less than required, check for

undersized pipe between the meter and the heater, a

restrictive fitting, or an undersized gas meter. Gas

supply pressures to the heater, when it is operating,

are listed in Table 6.

CAUTION

Manifold gas pressure for the LX and LT Low

NOx natural gas heaters should be set at 3"

WC. Propane heaters should be set to 9" WC.

ATTENTION

La pression du collecteur de pression pour les

systèmes de chauffage au gaz naturel devrait

être de 3'’ WC. Pour les sytèmes de chauffage

au gaz propane devrait être de 9'’ WC.

The manifold pressure may be checked by

connecting a manometer to the pressure port on the

outlet side of the valve. The pressure will be zero

when the heater is not running. When the heater is

operating the manifold gas pressure should be 3.0" WC

for natural gas heaters and 9.0" WC for LP gas

heaters. To adjust the manifold gas pressure, first

remove the slotted cap next to the inlet pressure port

on the inlet side of the gas valve. Under the slotted

cap is a slotted plastic screw which increases the

manifold pressure when turned clockwise and de-

creases the manifold pressure when turned counter-

clockwise. After measurements, and adjustments if

necessary, have been made, make sure to replace the

1/8" NPT gas valve plugs on the inlet and manifold

pressure ports, and the cap on the manifold pressure

adjustment screw. It is extremely important to replace

these parts before leaving the installation. Failure to

do so can result in damage to property or injury or

death. With the heater firing, the pressure must be

within the range shown in Table 6. Also check the

pressure with the heater off.

NOTE: The maximum inlet gas pressure must

not exceed the specified value. The minimum

value listed is for the purpose of input

adjustment. Refer to Table 6.

8. To connect the gas supply line to the heater's gas

valve, make sure the steel elbow (supplied with

the manifold) is screwed into the inlet side of the

gas valve. The heater is designed so that the gas

supply line may enter through either side of the

heater. Hand tighten the elbow until the desired

orientationisachieved.

CAUTION

Do not overtighten the elbow. Over tightening

will crack the gas valve. Do not use teflon tape

to wrap the elbow threads.

ATTENTION

Ne serrez pas trop le coude. Vous risqueriez

de fissurer la soupape de gaz. N’entourez pas

le filetage des coudes de ruban à joints.

Table 6. Gas Supply Pressure Requirements

Supply Pressure Minimum Maximum

Natural Gas 5.0 Inches WC 10.5 Inches WC

(1.2 kPa) (2.6 kPa)

LP Gas 11.0 Inches WC 14.0 Inches WC

(2.5 kPa) (3.5 kPa)

Manifold Pressure Nominal

Natural Gas 3.0 Inches WC (1.0 kPa)

LP Gas 9.0 Inches WC (2.2 kPa)

LX and LT Low NOx Pool/Spa Heater Page13

4.3 Special Precautions for LP Gas

LP Gas is heavier than air and can therefore

more readily collect or “pool” in enclosed areas if

provisionforproper ventilationis notmade. Installation

of pool heaters in enclosed areas such as pits is not

recommended. However, if such an installation is

required be sure to pay special attention to proper

ventilation for LP gas. Locate heaters a safe distance

from LP gas cylinders and filling equipment. Consult

the National Fuel Gas Code (NFPA 54 / ANSI

Z223.1, latest edition), the Natural Gas Installation

Code in Canada (CAN/CSA B149.1, latest edition),

and any other local codes and fire protection authori-

ties about specific installation restrictions in your area.

SECTION 5.

Water Connections

5.1 Water Piping

Figure10illustratestypicalpipingforpool

equipmentinpool/spacombinationpools.Withits

electronic control, the LX and LT Low NOx heaters

are particularly suited for this type of pool installation.

The heater must be protected from back-

siphoning of water, which can result in dry starts. If

there is any chance of back-siphoning, provide a check

valve between the pool and the filter pump inlet.

Arrangement of pool system components other

than as illustrated in these diagrams can affect the

operation of the heater’s water pressure switch.

Location of the heater above or below the pool water

surface can also affect operation of the switch. In

Figure10.TypicalPipingInstallation general, the pressure switch can be adjusted to

accommodate this effect if the heater water connec-

tions are no more than six feet below the pool water

surface and no more than 15 feet above it. See

instructions for pressure switch adjustment (Section

7.5) for more information about this.

Note that when pool equipment is located below

the pool surface a leak can result in large scale water

loss or flooding. Waterpik Technologies cannot be

responsible for such water loss or flooding or the

damage caused by either occurrence.

5.2 Check Valve Installation

Install a check valve in the plumbing between

the pool inlet and the heater if there is any chance of

back-siphoning.

Do not install any valve in the piping between the

heater outlet and the pool, unless it is being used as a

diverter valve. For special installations such as water

connections below the water level of the pool, or for

other questions contact the Technical Service depart-

ment at (707) 776-8200 ext. 260.

5.3 Automatic Flow Control Valve

The inlet/outlet header of the LX and LT Low

NOx heater comes equipped with an automatic flow

control valve. The automatic flow control valve

maintains the proper flow through the heater at rates

up to approximately 125 Gallons Per Minute (GPM)

(475 liters per minute [LPM]). If the filter system

flow rate is higher than approximately 125 GPM (475

LPM), install a manual bypass valve (see Figure 9),

then perform a temperature rise test (see Section 7.6)

and adjust the flow using the bypass valve until the

proper temperature rise is obtained.

Page14

1. For an existing installation, drain the heater by

removing the drain plug on the inlet/outlet header

and the two drain plugs on the return header.

2. Remove the heater front panel (door).

3. Remove the two hex head screws that hold the

raceway cover in place. They are located on the

bottom flange of the raceway cover. Slide the

raceway cover down to expose the raceway.

4. Remove the control panel assembly from the top

panel (see figure 13 for panel identification). Lift

the control panel cover. Remove the two philips

head screws located at the front edge of the

bezel. Lift the front of the bezel up until the entire

assembly comes away from the top. Without

removing any wires, slip the control assembly

through the hole so that when the top is removed,

the control assembly will stay with the heater.

5.4 Reversible Water Connections

The LX and LT Low NOx heaters are shipped

with water connections on the right side, but they can

be modified in the field to provide left-side water

connections. This procedure involves removing the

heat exchanger headers and reinstalling them on

opposite ends of the tube assembly. Some of the

heater wiring and control components must be relo-

cated, so this procedure must be done only by a trained

service technician.

Heat exchanger reversals are generally done

before the installation of power and water to the

heater. If you need to reverse the heat exchanger on a

previously installed heater be sure that all electrical

power, the gas supply and water supply have been

turned off before starting the procedure. These

instructions have been written to include the steps

needed when reversing the water connections on an

existing installation. If you are reversing the headers

on a new installation, some steps will be ignored.

Water connection reversal is illustrated in Figures 11

and 12 . Proceed as follows:

Figure 11. Water Connections as Shipped

Figure 12. Water Connections Reversed

Figure13.LX/LTPanelIdentification

I/OHEADERSIDE

COVERPLATE

UPPER

RIGHTSIDE

PANEL

UPPER

LEFTSIDE

PANEL

RETURN

HEADERSIDE

COVERPLATE

LEFT

SIDECOVER

PANEL

REAR

PANEL

TOP

PANEL CONTROL

PANEL

GRILL

FRONT

PANEL

(DOOR)

RACEWAY

COVER

5. Remove the four philips head screws that fasten

the vent grill to the top. Remove the vent grill.

6. Remove the top. Remove the two hex head

screws at the upper corners of the raceway.

Now lift up on the front of the top and push it

toward the rear of the heater. The top will slide

off the heater.

7. Remove the water pressure switch's copper

siphon loop tube from the header by first loosen-

ing the brass nut at the pressure fitting. Then

carefully pull the tube out of the fitting. There

should be about two inches of tubing inside the

header. Be careful not to create any kinks in the

tubingwhenhandlingit.

LX and LT Low NOx Pool/Spa Heater Page15

8. Clip the wire tie that bundles the wire harnesses

leading from the control panel. Disconnect the

two black temperature sensor wires from the

back of the control panel. Coil the wires and

place them on top of the flue collector.

9. Disconnect the high limit switch black wires from

the wire harness leading to the control panel.

There are quick disconnects at the end of the

wires.

10. Remove the flat inlet/outlet header side cover

plate located under the inlet/outlet header. There

are four philips head screws, one in each corner,

holdingitinplace.

11. Slide the upper right side panel up and out of the

corner posts and place it aside.

12. For an existing installation, disconnect the gas

supply pipe from the gas valve and remove it

from the heater.

13. Remove the left side cover panel, held to the

lower panel with two philips head screws at the

corners.

14. Remove the flat return header side cover plate to

expose the return header by removing the four

philips head screws, one in each corner.

15. Slide the upper left side panel up and out of the

corner posts and place it aside.

16 Foranexistinginstallation,removethecoupling

nuts from the header and disconnect the water

supply from the heater.

17. Remove the nine (9) bolts and washers from the

inlet/outlet header and remove the header from

the tube assembly.

18. Remove the nine (9) bolts and washers from the

return header and remove the header from the

tube assembly.

19. For an existing installation, inspect the header

gaskets and clean the header's mating surface of

any corrosion or debris. Do not use any metal

tools on the header surface. Scratches may

compromise the seal integrity.

20. Place the inlet/outlet header over the gasket on

the left side of the tube assembly and align the

holes in the header with the holes in the header

bar.

21. Insert the nine (9) bolts with washers through the

header and into the header bar. Hand tighten

the bolts.

22. Place the return header over the gasket on the

right side of the tube assembly and align the holes

in the header with the holes in the header bar.

23. Insert the nine (9) bolts with washers through the

header and into the header bar. Hand tighten

the bolts.

24. Use a torque wrench to tighten the bolts on each

header to eleven (11) foot-pounds. The bolts

must be tightened in the sequence indicated in

Figure14.

25. After completing the entire sequence as indicated

in step 24, repeat the tightening sequence torqu-

ing the bolts to eighteen (18) foot-pounds.

CAUTION

Failure to tighten the header as indicated in

steps 24 and 25 may cause the header to leak

or become permanently damaged from

warping. ATTENTION

Si le tuyau collecteur n’est pas serré

conformément aux directives des étapes 24 et

25, il risque d’avoir des fuites ou de

s’endommager de façon permanente.

26. Carefully bend the water pressure switch's

copper siphon loop tube so that it reaches the

inlet/outlet header now on the left side of the

heater. Do not straighten out the coil directly

behind the raceway and do not “kink” the

tubing.Straighteningthecoilorkinkingthetubing

may result in poor heater operation. Insert the

end of the tube into the fitting on the header.

Tighten the nut onto the fitting one half turn past

handtight.

Figure14.Headerbolt tightening sequence

Page16

27. Route the wires that attach to the high limit

switches along the copper siphon loop, back to

the right side of the heater. Reconnect the wires

to the wire harness.

28. Route the wires that attach to the temperature

sensor along the copper siphon loop, back to the

right side of the heater. Reconnect the wires to

the tabs on the back of the control panel

(marked as J4-1 and J4-2).

29. Use plastic wire ties to refasten the temperature

sensor and high limit switch wires to the copper

siphon loop. Bundle the wires near the control

panel and fasten them with a wire tie.

NOTE: Be sure that none of the wires are in

contact with a sharp edge or a hot surface.

30. Slide the upper right side panel back into the

corner posts on the right side of the heater. Push

it down until the tabs on the panel lock into the

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