Jandy pool/spa heater, Laars LX250, Laars LX400, Laars LT250, Laars LT400 Installation And Operation Manual
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. Improper installation and/or operation will void the warranty.
Installation and
Operation Manual
™ and LT™
LX
Gas-Fired Pool
and Spa Heater
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
Shown
Installation and service must be performed by a qualified installer, service
agency or the gas supplier.
H0214000B
TABLE OF CONTENTS
SECTION 1
General Information
1A Introduction............................................................ 1
1B Description............................................................. 1
1C Warranty................................................................ 1
SECTION 2
Installation Instructions
2A General Requirements .......................................... 1
2A-1 Special Precautions ............................................... 1
2B Heater Assembly and Preparation ........................ 1
2C Heater Location ..................................................... 2
2C-1 Installation Information .......................................... 2
2C-2 Installation Clearances.......................................... 2
2C-3 Flooring Typical Installation................................... 2
2D Outdoor Installation ............................................... 3
2E Outdoor Shelter Installation (Canada)................... 3
2F Indoor Installation .................................................. 3
2F-1 Preparation of Heater For
Indoor Installation .................................................. 3
2F-2 Special Location Requirement .............................. 4
2F-3 Air For Combustion and Ventilation ...................... 4
2F-4 Exhaust Venting .................................................... 4
2F-4a Important Information On Vent Pipe Sizing ........... 4
2F-4b Vent Pipe Sizing and Installation........................... 5
2G Gas Supply and Piping .......................................... 5
2G-1 General Instructions .............................................. 5
2G-2 Special Precautions For Propane Gas .................. 8
2H Electrical Power ..................................................... 8
2H-1 General Information ............................................... 8
2H-2 Bonding ................................................................. 8
2H-3 Auxiliary Time Clock Wiring................................... 8
2H-4 Remote Operation ................................................. 9
2I Water Piping........................................................ 10
2I-1 Reversal of Heater Water Connections............... 10
2I-2 Pool/Spa Piping Systems .................................... 13
2I-3 Connections at Heater......................................... 13
2I-4 Pressure Relief Valve .......................................... 14
2I-5 Automatic Chlorinators (Chemical Feeders) ....... 15
2J Start-Up and Adjustment ..................................... 15
2J-1 Normal Operation ................................................ 15
2J-2 Start-Up ............................................................... 15
2J-3 Gas Pressure....................................................... 16
2J-4 Adjustment of Water Pressure Switch................ 16
2J-5 Water Temperature Rise ..................................... 17
SECTION 3
Operating Instructions
3A Start-Up Procedure.............................................. 18
3B Temperature Controls ......................................... 18
3B-1 Information Displayed.......................................... 19
3B-2 Turning The Heater On Or Off ............................. 19
3B-3 Setting Pool And Spa Temperatures And
Changing From Fahrenheit To Celcius ............... 19
3B-4 Error Status ......................................................... 19
3C Lighting and Shutdown ........................................ 21
3C-1 Lighting the Heater .............................................. 21
3C-2 Shutdown ............................................................. 21
3D Water Chemistry.................................................. 21
3D-1 Pools.................................................................... 21
3D-2 Spas .................................................................... 21
3D-2a Spa Water Chemistry .......................................... 23
3D-2b Water Changing .................................................. 23
3D-2c Corrosion ............................................................. 23
3D-2d Testing................................................................. 23
3E Spa/Hot Tub Safety Rules ................................... 23
3F Swimming Pool Energy Saving Tips ................... 23
3G Seasonal Care..................................................... 24
3G-1 Spring and Fall Operation ................................... 24
3G-2 Winterizing........................................................... 24
3H Periodic Inspection .............................................. 24
3H-1 Owner Inspection................................................. 24
3H-2 Professional Inspection ....................................... 25
SECTION 4
Specifications and Dimensions
4A General Information............................................. 25
4A-1 Specifications ...................................................... 25
4A-2 Dimensions.......................................................... 25
SECTION 5
Replacement Parts
5A. General Information............................................. 26
5B Part Numbers ...................................................... 26
5C Exploded View Of Heater .................................... 27
5C-1 Overview Exploded View ..................................... 27
5C-2 Detail Exploded View.......................................... 28
Warranty................................................Back Cover
LX and LT Pool Heaters
Page 1
SECTION 1.
General Information
1A. Introduction
This manual contains information for the proper
installation and operation of the LX and LT pool/spa
heaters. Certain sections are specific to United States or
Canadian installations, and are labeled United States or
Canada. Procedures in this manual must be followed
exactly. To obtain additional copies of this manual contact
Waterpik Technologies. For address information see back
cover.
1B. Description
The Laars LX and LT have no standing pilot burner.
They 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
not have a continuous ignition source.
The heaters are designed to operate in conventional
swimming pool and spa equipment arrangements. They
require 120V or 240V, 60 Hz electrical power.
The Laars LX and LT are certified by International
Approval Services, Inc. to comply with latest editions of
applicable U.S./Canadian combined standard for gas-fired
pool heaters. In the United States, the applicable standard
is ANSI Standard Z21.56 for gas-fired pool heaters. In
Canada, it is Standard CSA 4.7. As such, the heater
carries both the AGA and CGA logos.
The heaters have been designed specifically to heat
fresh water swimming pools and spas, and with proper
installation and care, they will provide years of reliable
service. Do not use the heaters to maintain pool or spa
water temperature below 70°F. Do not use them as heating
boilers or general service water heaters or to heat salt
water. For special applications, consult your Waterpik
Technologies dealer.
SECTION 2.
Installation Instructions
2A. General Requirements
All gas-fired products require correct installation to
assure safe and satisfactory operation. The requirements
for pool heaters include the following:
1. Appropriate site location and clearances.
2. Sufficient supply of clean air for combustion and
ventilation.
3. Proper venting of products of combustion.
4. Properly sized gas pipe.
5. Properly sized gas meter.
6. Adequate water flow.
In the United States, installation must be in
accordance with local codes and the most recent edition of
the National Fuel Gas Code, ANSI Z223.1. The Code can
be obtained from:
National Fire Protection Association
1 Batterymarch Park
Quincy, MA 02269
In Canada, install the heater in accordance with
local codes and the most recent edition of the Installation
Codes for Gas Burning Appliances, CAN 1-B149.1 & .2.
The Canadian Gas Codes are available from:
Canadian Gas Association
55 Scarsdale Road
Don Mills, Ontario
M3B 2R3
DANGER
Improper installation or servicing can cause
property damage, injury or death due to fire,
asphyxiation or carbon monoxide poisoning.
1C. Warranty
The LX and LT are sold with a limited factory
warranty. A copy of the warranty is included in a plastic
bag inside the heater and on the back cover of this manual.
The home owner should fill out the warranty registration
card included in the plastic bag and return it to Waterpik
Technologies. The warranty does not cover damage caused
by improper installation, operation, or field modification;
or damage to the heat exchanger caused by corrosive
water. See Section 3D for guidelines on pool water
chemistry.
2A-1.Special Precautions
Liquefied petroleum (LP) gas is heavier than air.
Therefore, a pool heater using LP gas is subject to special
installation rules. Consult local codes and fire protection
authorities about specific installation restrictions.
Fuel gas and its combustion products are known to
cause cancer or harm the reproductive process. Follow
these installation instructions and applicable codes exactly
to avoid this hazard.
2B. Heater Assembly and Preparation
The LX or LT can be installed in a variety of ways,
some of them requiring preparation or assembly in the
field. 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.
Page 2
It is best to handle these preparations before the
heater is installed in its final location. Instructions are
provided in subsequent sections of this document.
Contact Waterpik Technologies regarding
installations at elevations above 3,000 feet (980 m). It is
necessary to make changes to the burner tray to assure
proper operation.
2C. Heater Location
2C-1. Installation Information
The LX and LT can be installed outdoors or indoors
as outlined in later sections. In either case location must
be selected with consideration of vent gas exhaust and in
the case of indoor installation, the location must have
suitable provisions for combustion and ventilation air.
Avoid placing the heater in locations where it can
cause damage by water leakage. If this is not possible,
provide a suitable drain pan to catch and divert any
leakage. The pan must not block natural flow of air to or
around the heater.
When a heater or any system component 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. Location of a
heater below or above the pool surface affects operation of
the heater pressure switch. See sections on water piping
and heater start-up for more information about this.
NOTE: See Outdoor Installation section regarding
roof overhang.
These clearances are the minimum acceptable.
Whenever possible, larger clearances should be provided to
assure adequate room for service operations. Note that gas
piping may be provided through either side of the unit. See
later section on gas piping.
Do not install the heater on carpeting or similar
material.
2C-3. Flooring - Typical Installation
The heater must not be installed on combustible
flooring without special measures to assure that the floor
temperatures will not be excessive.
A special base for combustible floors may be
obtained from Waterpik Technologies. The part number
appears in the parts list at the back of this manual (see
Section 5)
In the United States, the National Fuel Gas Code
allows 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 (102millimeters [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 (76.2mm) 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 1).
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.
2C-2. Installation Clearances
Clearances between the heater and combustible
material must be per Table 1.
Table 1. Minimum Heater Clearances from
Combustible Surfaces
A ll Ins ta lla ti o n s
Side of
Heater
Blank 4 (10.2)
Rear 4 (10.2)
Piping 12 (30.5)
To p 3 9 (9 9 .0 )
Front 18 (45.7)
U.S. and Canada
inch (cm )
Notes:
1. Blocks must provide 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.
Figure 1. Non-Combustible Platform.
LX and LT Pool Heaters
Page 3
2D. Outdoor Installation
The LX and LT 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, windows, 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 utility room. In the United
States there must be a minimum of 4 feet (1.22 m)
horizontally or vertically between the heater and any door,
glass opening, or gravity inlet to a building (see Figure 2).
DANGER
United States
Do not install the heater with the top of the
vent assembly within 4 feet (1.22 m) 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.
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 (0.30 m). The area under the
overhang must be open on three sides.
If the heater is installed close to a structure, protect it
4 ft (1.22 m)
2E. Outdoor Shelter Installation (Canada)
An outdoor shelter is an unoccupied enclosure which
does not communicate directly with occupied areas. The
LX and LT may be installed in such a shelter only when
the installation is in accordance with local codes and the
most recent edition of Standard CAN/CGA B-149. These
codes and standards and Waterpik Technologies require
that the heater be properly vented as outlined in this
manual. Other requirements also apply, such as provision
of ample uncontaminated air for combustion and
ventilation.
2F. Indoor Installation
2F-1. Preparation of Heater for Indoor
Installation
If the LX or LT is to be installed indoors, 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 or R0331405 (see
parts list in Section 5 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 3).
2. Replace the grill with the vent collar (see section
4 for kit number). 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 4).
3. Install the vent pipe on the indoor vent collar.
The collar will accommodate vent piping of
nominal 7" or 9" diameter, depending upon the
model of your heater (See Figure 5). See vent
installation section for important information on
selecting proper pipe size.
Figure 2. Outdoor Heater Installation.
from rain water runoff by means of gutters, roof water
diverters or similar measures. Do not locate the heater
close to irrigation sprinklers. Water from sprinklers may
damage controls and electronic components.
Avoid locations where wind deflection off nearby
structures might cause wind loading and 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).
Install the heater at least 5 feet (1.52 meters) from
the inside wall of the pool or spa unless the heater is
separated from the pool or spa by a five-foot (1.52meter)
high solid fence, wall or other permanent barrier.
Figure 3. Removal of Outdoor Exhaust Grill.
OUTDOOR
VENT GRILL
Page 4
INDOOR
VENT
COLLAR
GASKET
Figure 4. Vent Collar Assembly for Indoor Installation.
inch of flow area for each 4000 BTU/H of heater input. If
air is provided through horizontal ducts, each opening and
duct must provide one square inch of flow area for each
2000 BTU/H of heater input. These requirements are
summarized in Table 2. Note that the specified areas are
net free area, after allowing for the blockage of grill bars,
etc. See applicable codes for details.
Even though local codes may allow it, Waterpik
Technologies does not recommend installation in which
combustion and ventilation air is provided by infiltration.
Pool heaters tend to have larger input than many
appliances and it is best to specifically provide combustion
air means.
Table 2. Air Openings to Outside
Required Net Free Open Area
for Combustion Air Openings
Direct from outside Duct from outside
Model in
250 63 (406) 126 (813)
400 100 (645) 200 (1290)
2
(cm2)in2(cm2)
Figure 5. Vent Pipe Installation.
2F-2. Special Location Requirement
Virtually all local installation codes require that a
heater installed in a garage or similar structure be on a
platform at least 18 inches (46 cm) above the floor. This
requirement is in consideration of possible existence of
combustible fumes at floor level. Consider such
installations carefully and do not proceed if there is any
possibility of such fumes being ignited by the heater.
2F-3. Air For Combustion and
Ventilation
It is very important that the heater be provided with
adequate air for combustion and to ventilate the space in
which it is located. Provide combustion and ventilation air
as specified in local codes, or in their absence per the
National Fuel Gas Code ANSI Z223.1 or the Canadian
Installation Codes for Gas Burning Appliances, CAN 1B149.1 & 2.
In general, the codes require that the space in which
the heater is located be provided with two combustion air
openings, one within 12 of the floor and one within 12
of the ceiling (see Figure 6). If air is supplied directly
from the outside, the openings must provide one square
2F-4. Exhaust Venting
2F-4a.Important Information on Vent
Pipe Sizing
When converted to indoor venting configuration, the
LX and LT 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 3 and
the applicable installation code as stated in the "Danger"
warning below.
Table 3. Vent Pipe Sizing Table
LX
Model
250 7.0 17.8
400 9.0 22.9
Vent Pipe Diameter
inc h (cm )
DANGER
Vent pipe diameter must be as required by
the National Fuel Gas Code Z223.1 or the
Canadian Installation Codes for Gas
Appliances CAN 1-B149.1 & 2. 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.
LX and LT Pool Heaters
FOR GARAGE
INSTALLATION
BASE OF HEATER
MUST BE A
MINIMUM OF 18
INCHES (46 CM)
ABOVE THE
FLOOR
Page 5
ROOF JACK
2)
Figure 6. Indoor Installation Venting (USA), or Outdoor Shelter (Canada).
2F-4b.Vent Pipe Sizing and
Installation
As part of their certification, the LX and LT have
been determined to be a Category I Fan-Assisted
appliance. They are intended for standard vertical venting
per tables provided in most local codes for Category I FanAssisted appliances. If the local code does not include
such tables, refer to the National Fuel Gas Code Z223.1 or
the Canadian Installation Codes for Gas Appliances CAN
1-B149.1 & 2. Note that the tables for fan-assisted
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 dont cool too much and thereby
assure that condensation doesnt occur.
It is important that all aspects of venting installation
be in accordance with local codes, or in their absence, the
cited national codes. Vent diameter, height, allowable
length of horizontal runs, vent cap requirements, location
and height of vent terminations on a roof, and many other
important matters are covered in these codes. Proper
installation of the LX and LT heaters requires that all
these factors be correctly handled.
2G. Gas Supply and Piping
1. The gas supply must be able to provide gas at
pressures specified in Table 5.
2. Gas piping installation must be in accordance with
the latest edition of ANSI Z223.1. In Canada, the
installation must be in accordance with CAN- B149.1
or .2 and all local codes that apply.
3. Check the rating plate to make sure the heater is
fitted for the type of gas being used. Waterpik
Technologies heaters shipped from the factory are
certified to operate at an altitude of 0 to 3000 feet (0
to 915 m) for natural gas and 0 to 5000 feet (0 to
1525 m) for propane, or if so ordered, at higher
altitudes. In the United States, the heater manifold is
marked with a tag or sticker indicating one of the
following high altitude operation codes:
FOR NATURAL GAS
a. High altitude (H) - 3,000 to 6,000 feet
(915 to 1830 m)
b. High altitude (J) - 6,000 to 10,000 feet
(1830 to 3050 m)
FOR PROPANE GAS
a. High altitude (H) - 5,000 to 10,000 feet
(1525 to 3050 m)
2G-1. General Instructions
Review the following general instructions before
continuing the installation.
4. In Canada, the heater rating plate is marked for
specific altitude requirements as follows:
FOR NATURAL GAS
a. Factory Released - 0 to 2,000 feet
(0 to 610 m)
Page 6
b. High altitude (H) - 2,000 to 4,500 feet
(610 to 1370 m)
FOR PROPANE GAS
a. Factory Released - 0 to 4,500 feet
(610 to 1370 m)
5. Use only wrought steel piping or when permitted by
local codes, other rigid piping material. Do not use
flexible gas connectors, which restrict gas flow to the
heater.
6. Table 4 specifies sizing for gas supply piping based
on 1/2 WC (3.45 kPa) pressure drop in the piping.
Larger piping may be necessary if the local gas
supply is at pressures which will not guarantee
adequate pressure at the heater. Table 5 specifies the
maximum and minimum supply pressures necessary
at the heater when it is operating.
7. Install a sediment trap (drip leg) ahead of the gas
controls (see Figure 7). Fit the trap with a threaded
cap which can be removed for cleaning.
8. Install a manual gas shut-off valve for service and
safety. Do not use a restrictive gas cock.
CAUTION
Permanent damage to the gas valve will occur
if the following procedures are not followed.
9. 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.
Table 4. Natural 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. in. in.
250 1 1-1/4 1-1/4
400 1-1/4 1-1/2 1-1/2
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 liquefied
petroleum gas, reduce pipe diameter one size, but
maintain a 3/4 inch minimum diameter.
2. Check supply pressure and local code requirements
before preceding with work.
Table 5. Gas Supply Pressure Requirements
Supply Pressure Natural Gas Propane Gas
Water Column in. (kPa) in. (kPa)
Minimum 6 (1.5) 11 (2.8)
Maximum 10.5 (2.7) 14 (3.5)
10. 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 5.
Manual Shutoff
Valv e
Gas Supply
Inlet
T-Fitting
3" Min.
Figure 7. The Proper Design for a Sediment Trap/Drip
Leg.
Nipple
Cap
Union
NOTE: The maximum inlet gas pressure must not
exceed the specified value. The minimum value listed is
for the purpose of proper heater operation. Refer to Table
11. To connect the gas supply line to the heater's gas
valve, you must first install a steel elbow (supplied
with the heater in the installation and instruction
box). Screw the elbow 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.
To
Equipment
Inlet
CAUTION
Do not over tighten the elbow. Over tightening
will crack the gas valve. Do not use teflon tape
to wrap the elbow threads.
LX and LT Pool Heaters
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Figure 8. LLD Connection/Schematic Wiring Diagram.
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The fan on this heater must have power to run after the filter pump has been shut off.
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CAUTION: Do not connect the power of the heater to the "load" or output side of a filter pump relay or time clock.
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Page 8
12. 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.
2G-2. Special Precautions for
Propane Gas
Liquefied petroleum (LP) gas is heavier than air.
Therefore, do not install pool heaters using LP gas in pits
or locations where gas might collect. Locate heaters a safe
distance from LP gas storage and filling equipment.
Consult local codes and fire protection authorities about
specific installation restrictions.
2H. Electrical Power
2H-1.General Information
Wiring connections must be made exactly as shown
in the wiring diagram found on the inside of the heater
(see Figure 8 ). Grounding must be provided as required by
the prevailing electrical code. A separate bonding wire
MUST be provided as indicated in the following section
The heater comes factory-wired intended for use with
240 Volt, 60 Hz AC field electrical supply. To convert to
120 Volt, 60 Hz AC requires the changing of the fifteenpin connector assembly on the component raceway.
Remove the fifteen-pin connector from the receptacle
located directly below the fan intake on the raceway. All
the wires on the connector are red and the connector is
marked "240V". The fifteen-pin connector will have two
CONNECT
WIRES
INSIDE
HEATER
WIRES
AS
SHIPPED
CONDUIT
ELBOW
wires that lead to a two position terminal block located
next to the connector. Remove the two wires from the
terminal block. Take the fifteen-pin connector assembly
with the black wires from the installation and instructions
box. It is marked "120V". Connect the two long wires to
the two position terminal block. Either wire may be
connected to either tab on the terminal block, the
connections are not polarity sensitive. Plug the fifteen-pin
connector into the receptacle. The connector is keyed so it
will fit in only one orientation.
Electrical wiring must be in accordance with the
latest edition of the National Electric Code (NEC), ANSI/
National Fire Protection Association (NFPA) 70, unless
local code requirements indicate otherwise.
CAUTION
DO NOT connect power to the LX or LT pool
heater from the load side of a filter pump relay
or time clock.
To wire the Laars LX or LT heater:
1. Wire the heater to a 120V or 240V /60 Hertz (Hz)
electrical source.
2. Connect the wires from the source to the leads on the
right side of the heater in the space behind the
raceway (see Figure 9).
NOTE: No external junction box is required.
2H-2. Bonding
The National Electrical Code and most other codes
require that all metallic components of a pool
structure, including reinforcing steel, metal fittings and
above ground equipment be bonded together with a solid
copper conductor not smaller than a number 8 wire. The
heater, along with pumps and other such equipment must
be connected to this bonding grid. A special labeled
bonding lug is provided on the right side of the heater to
accommodate this requirement.
2H-3. Auxiliary Time Clock Wiring
If you install a time clock to control the filter pump
operation, it is recommended that the time clock have its
own low voltage (Firemans) switch to turn off the heater
before turning off the pump . The switch should shut off
the heater about 15 minutes before the filter pump shuts
off. This will allow for a more efficient operation by
removing any residual heat contained in the heat
exchanger back to the pool.
To install a time clock auxiliary switch into the
heater circuit, follow these instructions (see Figure 10):
Figure 9. Field Wiring Connections.
1. Remove heater door.
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