Installation and Operating Data
FOR YOUR SAFETY - This product must be installed and serviced by authorized personnel, qualified in pool/spa heater installation. Improper installation and/or operation can
create carbon monoxide gas and flue gases which can cause serious injury, property
damage, or death. 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.
Installation and
Operation Manual
®
LX
and
®
LT
Low NOx*
Gas-Fired Pool
and Sp a Heater
Model LX/LT-Low NOx*
Natural Gas and LP
*Only models using natural gas are certified
as meeting low NOx emissions requirements.
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’s instructions.
• If you cannot reach your gas supplier, call the fire department.
Model
LX250-L
Shown
Installation and service must be performed by a qualified installer, service
agency or the gas supplier.
H0256100E
TABLE OF CONTENTS
SECTION 1. General Information
1.1 Introduction .................................................1
1.2 Consumer Information and Safety................1
1.2.1 Spa/Hot Tub Safety Rules ...........................1
1.2.2 Swimming Pool Energy Safety Tips.............2
1.3 Warranty .....................................................2
1.4 Codes and Standards..................................2
1.5 Technical Assistance..................................3
1.6 Materials Installer Must Provide...................3
1.6.1 Materials for All Applications .......................3
1.6.2 Materials for Special Applications................3
1.7 Specifications..............................................3
1.7.1 General Specifications ................................3
1.7.2 Dimensions .................................................4
SECTION 2. Installation Instructions
2.1 Introduction .................................................5
2.2 Field Assembly ...........................................5
2.3 Location Requirements................................5
2.3.1 Introduction .................................................5
2.3.2 Clearances ..................................................5
2.3.3 Flooring .......................................................6
2.3.4 Outdoor Installation .....................................6
2.3.5 Indoor and Outdoor Shelter Installation ........7
2.3.5.1 Converting the Grill to a Vent Collar.............8
SECTION 3. Venting
3.1 Combustion Air Supply................................8
3.2 Exhaust Venting..........................................9
3.3 Vent Pipe Sizing and General Installation....1 0
3.3.1 Outdoor Installations ...................................10
3.3.2 Indoor and Outdoor Shelter Installations ......10
3.3.3 Inspection and Replacement of Existing
Vent System with New Components ...........11
SECTION 4. Gas Connections
4.1 Gas Supply and Piping................................11
4.2 Manifold Pressure .......................................12
4.3 Special Precautions for Propane Gas..........13
SECTION 5. Water Connections
5.1 Water Piping ...............................................13
5.2 Check Valve Installation ..............................13
5.3 Automatic Flow Control Valve......................13
5.4 Reversible Water Connections.....................14
5.5 Connections at Heater.................................16
5.6 Pressure Relief Valve ..................................17
5.7 Auxiliary Components, Chlorinators, Ozone
Generators, and Sanitizing Chemicals.........1 8
SECTION 6. Electrical
6.1 General Information .....................................18
6.2 Main Power .................................................18
6.2.1 Converting the Heater for a 115V
Power Source .......................................2 0
6.3 Bonding.......................................................20
6.4 Auxiliary Time Clock Wiring ........................21
6.5 Remote Operation .......................................21
SECTION 7. Operating Instructions
7.1 Normal Operation ......................................23
7.2 Start-Up ....................................................23
7.3 Temperature Controls ................................24
7.3.1 Information Displayed ................................24
7.3.2 Turning the Heater On or Off......................25
7.3.3 Setting Pool and Spa Temperatures,
Changing from Fahrenheit to Celsius....2 6
7.4 Lighting and Shutdown Procedures ...........26
7.4.1 Lighting the Heater ....................................26
7.4.2 Shut Down ................................................26
7.5 Adjusting the Water Pressure Switch........28
7.6 Temperature Rise ......................................29
SECTION 8. Maintenance
8.1 Water Chemistry.......................................30
8.2 Seasonal Care ..........................................30
8.2.1 Spring and Fall Operation..........................30
8.2.2 Winterizing................................................30
8.2.3 Spring Start-up..........................................31
8.3 Inspection and Service ..............................31
8.3.1 Owner Inspection ......................................31
8.3.2 Professional Inspection .............................32
SECTION 9. Troubleshooting
9.1 General Heater Troubleshooting Guide ......32
9.2 Service Codes ...........................................33
9.3 Ignition Control LED Service Codes ...........33
SECTION 10. Professional Maintenance
and Service
10.1 General Information ...................................36
10.2 "Premix" Induced Draft
Combustion System ..............................36
10.3 Special Service Issues
Premix Combustion System ..................37
10.3.1 System Operation .....................................37
10.3.2 Field Service and Adjustment....................37
10.4 Heater Components and Their Operation ...38
10.5 Electrical Trouble Shooting........................38
10.5.1 Electrical Power Supply ............................39
10.5.2 Controller ..................................................39
10.5.3 Control Circuit Trouble Shooting ................39
10.5.3.1 Transformer ...............................................40
10.5.3.2 Fuse .........................................................40
10.5.3.3 Water Pressure Switch/External Interlock
or Fireman Switch Circuit.....................40
10.5.3.4 Temperature Limit Switches Circuit ...........40
10.5.3.5 Fusible Link/Manual Reset Limit Switch
Circuit..................................................41
10.5.3.6 Blower Pressure Switch Circuit .................4 1
10.5.3.7 Gas Valve Voltage ....................................42
10.5.3.8 Igniter/Ignition Control Circuit.....................42
SECTION 11. Replacement Parts
11.1 Ordering Information ..................................46
11.2 Parts List ..................................................47
11.3 General Exploded View .............................48
11.4 Detailed Exploded View ............................49
Warranty .....................................Back Cover
LX and LT Low NOx Pool/Spa Heater Page 1
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 thermostat control system for pool/spa combinations or
preheat convenience.
The LX and LT Low NOx heaters are specifically 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 affected by fuel gas properties. As noted in the troubleshooting 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 maintained 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 "
comply with all of the warnings and cautions.
1.2.1 Spa/Hot Tub Safety Rules
The following “Safety Rules for Hot Tubs,”
recommended by the U.S. Consumer Product
Safety Commission, should be observed when
using the spa.
" symbol. Be sure to read and
WARNING
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
for young children.
2. The 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 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.
Page 2
Hyperthermia occurs when the internal body
temperature reaches a level several degrees above the
normal body temperature of 98.6°F (37°C). Symptoms
include dizziness, fainting, drowsiness, lethargy, and an
increase in the internal body temperature. The effects
of hyperthermia include:
• Lack of awareness of impending hazard
• Failure to perceive heat
• Failure to recognize need to leave spa
• Physical inability to leave spa
• 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), installation date, and name of the installer. Shipping costs are
not included in the warranty coverage.
The warranty does NOT cover damage caused
by improper assembly, installation, operation or field
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 chemistry.
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
utility or authorities having jurisdiction. All local codes
take precedence over national codes.
In the absence of local codes, refer to the latest
edition of the following national codes for installation:
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 Page 3
Any changes to the heater, gas controls, gas
orifices, wiring, draft diverter, or improper installation
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
involving the specifications, installation, and operation
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 Materials Installer Must Provide
1.6.1 Materials for All Applications
The following items are needed and are to be
supplied by the installer for
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 following 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
any Jandy distributor.
all LX/LT Low NOx
1.7 Specifications
1.7.1 General Specifications
1. Installation Location:
Certified for use:
In the USA:
Natural Gas: Indoor and Outdoor
LP: Indoor and Outdoor
In Canada:
Natural Gas : Outdoor and Outdoor
Shelter
LP: Outdoor and Outdoor
Shelter
2. Minimum Clearance From Combustible Material:
See Table 2 in Section 2.3.2
3. *Gas Pipe/Heater Gas Valve Connection:
Natural Gas: 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: 125 gpm (475 lpm)
Minimum: 30 gpm (110 lpm)
8. Working Water Pressure:
Maximum: 75 psi
9. Exhaust Vent Connection Size:
Model:
250 7" Diameter
400 9" Diameter
2. Primer and cement suitable for cementing CPVC
pipe to PVC pipe and an appropriate coupling for
connecting the factory supplied CPVC pipe
nipples to PVC pool plumbing.
3. A non combustible platform for installation on
combustible surfaces (see Section 2.3.3). Non
combustible bases are available from your Jandy
distributor.
10. Electrical Supply:
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, manifold kits for mid altitudes and
Page 4
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
exterior dimensions and dimensions to critical connections on the heater.
Table 1. Altitude Designations For The LX/LT Heaters
NATURAL GAS
ALTITUDE UNITED CANADA
DESIGNATION STATES
LOW ALTITUDE 0-3000 FT 0-2000 FT
(0-610 m)
MID ALTITUDE 3001-6000 FT 2001-4500 FT
(611-1370 m)
HIGH ALTITUDE 6001-10,000 FT NOT
APPLICABLE
LP
LOW ALTITUDE 0-5000 FT 0-4500 FT
(0-1370 m)
HIGH ALTITUDE 5001-10,000 FT NOT
APPLICABLE
Heater Width
Model* Dim "A" Heater Depth Heater Height Vent Diameter Firing Rate
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
* Values shown are for both LX and LT models.
Figure 1. General Configuration
LX and LT Low NOx Pool/Spa Heater Page 5
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, Waterpik Techonologies
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
heaters include the following:
1. Field assembly (if required)
2. Appropriate site location (clearances) and
flooring
3. Sufficient combustion and ventilation air
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
installation procedures completely before continuing
the installation.
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
Shelter Installations".
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 sections. 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 startup 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 standards. However, each installation must also be evaluated, taking into account the prevailing local conditions
such as wind speed and direction, proximity and height
of walls that may block ventilation, and proximity to
public access areas.
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 configured 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.
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
the igniter.
If the heater is to be installed in a garage, or
Page 6
Table 2. Minimum Heater Clearances From Combustible Surfaces
Table 2. Dégagements Minimaux à Assurer Entre les Parois de L'appareil et les Constructions Combustibles
SIDE OF INDOOR (OUTDOOR SHELTER) OUTDOOR INSTALLATION
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 OPEN UNROOFED AREA
FRONT 18* 45.7 18* 45.7
similar structure, all burners and burner 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.
Note: Clearances listed in T able 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.
* In Canada - 24 in (61cm)
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
being ignited and burning and with no combustible
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
carpet floor without placing a noncombustible platform
between the floor and the heater.
The heater can be installed on a combustible
floor if a noncombustible base assembly, available
from Jandy, is used. See the heater rating plate or the
Parts List (Section 11) of this manual for the appropriate 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
Notes:
1. Blocks must provide a solid base and be braced so 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.
Figure 2. Non-Combustible Platform
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
LX and LT Low NOx Pool/Spa Heater Page 7
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
opening into a building.
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
located within ten(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
living areas through doors, windows, or gravity inlets.
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.,
nearby buildings and walls).
In Florida it is required that the heater be securely fastened to the equipment pad. Use a size
1/4" x 1-1/2" long stainless steel Tapcon® type concrete 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 requirements 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 3. Outdoor Heater Installation
Figure 4. Anchor Heater To Equipment Pad
2.3.5 Indoor and Outdoor Shelter
Installations
An outdoor shelter (Canada only) is an unoccupied 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
installed without modification and in accordance with
the instructions provided by the manufacturer.
Page 8
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 Technologies require that the heater be properly vented as
outlined in this manual. Proper ventilation of exhaust
and combustion air are essential for the safe and
efficient operation of the heater (See Section 3).
OUTDOOR
VENT GRILL
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
done quite simply as follows:
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).
Figure 5. Removal of Outdoor Exhaust Grill
INDOOR
VENT
COLLAR
GASKET
Figure 6. Vent Collar Assembly for Indoor and Outdoor
Shelter Installation
Figure 7. Vent Pipe Installation
3. Install the vent pipe on the indoor vent collar. The
collar will accommodate vent piping of nominal 7"
or 9" diameter (see Table 4), depending upon the
model of your heater (See Figure 7). See vent
installation section for important information on
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/CSAB149.1, 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) of the floor. All indoor installations
must have openings to outside air for combustion,
ventilation, and dilution of flue gases from inside the
building (see Figure 7 and Table 3). Waterpik Technologies does not recommend indoor installations that
do not provide combustion air from outside the building.
All outdoor shelter installations (Canada only)
must have uninterrupted openings to outside air for
combustion and ventilation. The installation must be in
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.
LX and LT Low NOx Pool/Spa Heater Page 9
Notes:
1. Use approved
roof jack.
3)
Figure 8. Indoor Installation Venting (USA), or Outdoor Shelter (Canada)
Table 3. Air Openings to Outside
Required Net Free Open Area*
for Combustion Air Openings
Direct from outside Duct from outside
Model in
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.
2
(cm2)in2(cm2)
Outside Air Supply: When combustion air is
supplied directly through an outside 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.
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
qualified engineers.
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.
Page 10
Table 4. Vent Pipe Sizing Table
LX/LT Vent Pipe Diameter
Low NOx
Model inch cm
250-L 7.0 17.8
400-L 9.0 22.9
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’entraîner une ventilation inadéquate et des
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 standard 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 fanassisted appliances include both maximum and minimum 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
For outdoor installations, exhaust venting consid-
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
Jandy distributor.
3.3.2 Indoor and Outdoor Shelter
Installations
All indoor installations and outdoor shelter
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 accordance 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 the applicable provisions of the local
building codes.
2 In Canada, CAN/CSA B149.1.
Avoid terminating heater vents near air conditioning or air supply fans. The fans can pick up
exhaust flue products from the heater and return them
inside the building, creating a possible health hazard.
Do not locate the vent terminal where flue
products could strike against building materials and
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
and inspection.
The vent collar outlet is to be connected to an
unobstructed vent pipe of the same diameter, terminating 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.
When venting multiple appliances through one
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
information on multiple venting.
LX and LT Low NOx Pool/Spa Heater Page 11
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
continuing the installation.
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.
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
all local codes for compliance before installing
the heater.
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. These numbers are for natural gas (0.65 Sp. 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.
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.
APPROVED
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
Figure 9. Proper Design for a Sediment Trap/Drip Leg
Page 12
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.
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)
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
orientation is achieved.
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.
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 decreases the manifold pressure when turned counterclockwise. 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.
LX and LT Low NOx Pool/Spa Heater Page 13
Figure 10. Typical Piping Installation
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
provision for proper ventilation is not made. 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 authorities about specific installation restrictions in your area.
SECTION 5.
Water Connections
5.1 Water Piping
Figure 10 illustrates typical piping for pool
equipment in pool/spa combination pools. With its
electronic control, the LX and LT Low NOx heaters
are particularly suited for this type of pool installation.
The heater must be protected from backsiphoning 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
general, the pressure switch can be adjusted to
accommodate this effect if the heater water connections 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 department 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.
Page 14
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 relocated, 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:
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.
GRILL
TOP
PANEL
CONTROL
PANEL
Figure 11. Water Connections as Shipped
I/O HEADER SIDE
REAR
PANEL
RETURN
HEADER SIDE
COVER PLATE
UPPER
LEFT SIDE
PANEL
LEFT
SIDE COVER
PANEL
Figure 13. LX/LT Panel Identification
COVER PLATE
UPPER
RIGHT SIDE
PANEL
RACEWAY
COVER
FRONT
PANEL
(DOOR)
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.
Figure 12. Water Connections Reversed
7. Remove the water pressure switch's copper
siphon loop tube from the header by first loosening 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
tubing when handling it.
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