Installation and Operation Data
FOR YOUR SAFETY - This product must be installed and serviced by a profes-
sional service technician, qualified in pool heater installation. Improper installa-
tion and/or operation could create carbon monoxide gas in flue gases which
could cause serious injury, property damage, or death. Improper installation
and/or operation will void the warranty.
Installation and
Operation Manual
™
Laars Lite 2
Pool and Spa Heater
Models LG and LD
Natural Gas or LP Gas
NOTE: LD LP Gas For
Outdoor Use Only
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 nearby phone. Follow the gas
supplier’s instructions.
• 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.
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Model LG & LD Pool and Spa Heater
Page 1
with the installation. Consult the Waterpik Laars
SECTION 1.
General Information
factory, or local factory representative, with any
questions regarding this equipment. Experience has
shown that most operating problems are caused by
improperinstallation.
1A. Introduction
The Laars Lite 2 heater is design certified by
International Approval Services (formerly American
Gas Association and Canadian Gas Association) as
complying with the latest edition of the Standard for
This manual provides installation and operation
instructions for the Laars Lite 2, Model LG and LD
pool and spa heaters. Read these installation and
operationinstructionscompletelybeforeproceeding
(920 cm)
VentingDimensions
Model
Size
Heater
Width
U.S. Indoor or
Firing Rate / Hr.
(1,000's)
Vent
Diameter
U.S.Outdoor
Dim "H"
CANOutdoor
Shelter Dim "H"
in
(cm)
in
5
6
7
8
9
(cm)
in
(cm)
(23)
(24)
(26)
(27)
(34)
in
(cm)
BTU
125
175
250
325
400
(kcal)
(31.5)
(44.1)
(63)
125
175
250
325
400
15
(38)
(12.7)
(15.2)
(17.8)
(20.3)
(22.9)
9 1/8
9 3/4
10
16 1/4
24 1/8
25 1/4
26 1/2
27 1/2
(41.3)
(61.3)
(64.1)
(67.3)
(69.9)
18
(45.7)
(57.2)
(67.9)
(80.6)
22 1/2
26 3/4
31 3/4
10 5/8
13 1/4
(81.9)
(101)
Notes:
1. In Canada, derate BTU/Hr input and output 10 percent for altitudes of 2,000 to 4,500 feet (609 to 1372 m) above sea
level. No derating necessary up to altitude of 2,000 feet (609 m). In United States derate input 4 percent for each 1,000
feet (305 m) above sea level, starting at 2,000 feet (609m).
2. The Laars Lite 2 is constructed for 75 psi working pressure.
3. Ratings shown are for both natural and propane gas.
Figure 1. General Configuration.
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WATERPIK TECHNOLOGIES INC.
Page 2
Gas-Fired Pool Heaters, ANSI Z21.56, and in Canada
with CAN1-4.7-M85.
Certain sections of this manual are specific to
either United States or Canadian installations, and are
labeled as such.
SECTION 2.
InstallationInstructions
2A. General Information
Install the Laars Lite 2 heaters, vent caps and
drafthoods in accordance with the procedures in this
manual, local codes and ordinances, and in accordance
with the latest edition of the National Fuel Gas Code,
ANSI Z223.1. In Canada, the installation must be in
accordance with CAN1-B149.1 or .2 and local codes.
The authority having jurisdiction may require that the
installation conform to the Standard for Gas-Fired
Heaters, ANSI Z21.56. Any changes to the heater, gas
controls, gas orifices, wiring, draft diverter, or im-
proper installation may void the warranty. If field
conditions require change to any of the above, consult
the factory.
1B. Description
The Laars Lite 2 LD heater gets electrical power
from an external 120VAC or 240VAC source and
provides a dual thermostat Flex-Temp control system
for pool/spa combinations or preheat convenience. The
Laars Lite 2 LD heater also meets the California, New
York, Hawaii, and Oregon state energy requirements
for intermittent ignition gas appliances. The Laars Lite
2 LG heater is a self contained standing pilot unit and
requires no external power.
The Laars Lite 2 heater is specifically designed
for heating swimming pools and spas. Do not use it as
a general service water heater. There is a specially
designed model of Laars Lite 2 for heating salt water
pools. Consult your dealer for the appropriate
Waterpik Laars products for these applications.
All gas-fired products require correct installation
to assure safe operation. The requirements for pool
heatersincludethefollowing:
1. Field assembly (if required)
2. Appropriate site location (clearances) and
flooring
1C. Warranty
3. Sufficient combustion and ventilation air
4. Properly sized gas meter and piping
5. Proper electrical wiring (if required)
6. Adequate water flow
The Laars Lite 2 heater is sold with a limited
factory warranty. Details are specified on the back
cover of this manual. A copy of the warranty and a
warranty registration card are included in the plastic
bag shipped with the heater. Fill out and return the
warranty registration card.
Make all warranty claims to an authorized
Waterpik Laars 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 cover-
age.
This manual provides the information needed to
meet these requirements. Review all application and
installationprocedurescompletelybeforecontinuing
the installation.
2B. Field Assembly
The Laars Lite 2 heater is shipped from the
factory with the top assembly in the low-profile
configuration for outdoor installation in the U.S. In
Canada, an outdoor installation requires the addition of
a factory approved vent cap. The Laars Lite 2 heater is
design certified for indoor installation when equipped
with a drafthood, which must be installed without
modification.
Damage caused by improper installation or
assembly, or to the heat exchanger by corrosive water,
is NOT covered by the Warranty. See Section 3D for
maintaining proper pool water chemistry.
NOTE: Keep this manual in a safe place for
future reference when inspecting or servicing the
heater.
The Laars Lite 2 heater is also certified for
installation in an outdoor shelter in Canada when
equipped with a drafthood. An outdoor shelter is an
enclosure not normally occupied which does not
communicate directly with occupied areas.
Check the rating plate on the heater or the Parts
List (Sec. 4) of this manual for the correct Waterpik
Laars drafthood or vent cap part number. See instruc-
tions supplied with the drafthood or vent cap for
installation and attachment. When the drafthood is
used, locate the heater so as to be in the same atmo-
spheric pressure zone as the combustion air inlet to the
heater.
1D. Technical Assistance
Consult Waterpik Laars or your local distributor
with any questions or problems involving the specifica-
tions, installation, and operation of your Waterpik
Laars equipment. An experienced technical support
staff is ready to assist in assuring the proper perfor-
mance and application of Waterpik Laars products.
For technical support call (415) 382-8220 extension
260.
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Model LG & LD Pool and Spa Heater
Page 3
Notes:
1. An Underwriters' Laboratories listed vent cap is required to prevent downdraft and allow the heater to function properly
and safely.
2. Use approved roof jack.
Figure 2. Indoor Installation Venting (USA), or Outdoor Shelter (Canada).
Table 1. Air Openings to Outside.
RequiredNetFreeOpenArea
forCombustionAirOpenings
2C. Site Location
WARNING
Directfromoutside
Duct from outside
Improper installation or maintenance can
cause nausea or asphyxiation from carbon
monoxide in flue gases which could result in
severe injury, or death.
Model
125
175
in2
(cm2)
(206)
(284)
(406)
(429)
(645)
in2
(cm2)
(413)
(568)
(813)
(1058)
(1290)
32
44
64
88
250
63
126
164
200
325
400
82
100
2C-1. Installation Information
Note: If using screens and/or louvers, compensate by adding 50%
additional area to each opening.
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 block natural
flow of air around the heater.
Locate the heater so the clearances from combus-
tible surfaces shown in Table 2 are met.
When a drafthood is used, it must be connected to
a vent pipe which stops at least 2 feet (0.61 meters
[m]) above the highest point of the roof or other object
that is within 10 feet (3.05 m) from the vent termina-
tion. The vent pipe must have a listed vent cap which
allows a full equivalent opening for flue products (see
Figure 2).
Table 2. Minimum Heater Clearances From Combustible Surfaces
Indoor (Outdoor Shelter) Installation
Outdoors Installation
U.S. Canada
U.S.
Canada
(
)
(
)
(
(
(
)
)
)
(
cm
)
Side of Heater
Blank
inch
6
cm
inch
6
cm
inch
6
cm
32
32
inch
6
(
(
(
)
)
)
(
)
)
)
(
15.2
)
)
)
15.2
15.2
30.5
15.2
15.2
45.7
(
(
(
15.2
Rear
6
6
6
6
(
)
(
Piping
12
44
18
18
44
36
12
30.5
18
45.7
(
)
(
)
Top
111.7
111.7
Open Unroofed Area
(
)
(
)
(
)
(
)
Front
45.7
91.4
18
45.7
36
91.4
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WATERPIK TECHNOLOGIES INC.
Page 4
2C-2. Outdoor Installation
feet (0.91 m) from vertical surfaces (e.g., nearby
buildings and walls). The addition of a vent cap may
be necessary.
Laars Lite 2 heaters can be installed in the low-
profile, grate top configuration (U.S.A. only) as
received from the factory, or with an optional high
wind vent cap/stack. Canadian units require a factory
approved vent cap.
2C-3. Flooring - Typical Installation
Do not install the heater directly on a combus-
tible wood or carpet floor without placing a noncom-
bustible platform between the floor and the heater. 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 (102 millimeters [mm])
Figure 3. Outdoor Heater Installation.
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
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. In Canada this distance
must be at least 10 feet (3.0 m) (see Figure 3).
WARNING
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.
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.
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.
Figure 4. Non-Combustible Platform.
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 (76.2 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 4). If the
heater is installed in a carpeted alcove, the entire floor
of the alcove must be covered by a noncombustible
panel. You can obtain a noncombustible base from
Waterpik Laars, see the Parts List (Sec. 4) of this
manual.
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.
This prevents combustion gases from being diverted
into living areas through doors, windows, or gravity
inlets.
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 sprinkler systems that could spray water on it.
Avoid locations where wind deflection off nearby
structures might cause downdraft conditions. Where
downdraft conditions exist, locate the heater at least 3
2C-4. Indoor and Outdoor Shelter
Installations
All indoor installations and outdoor shelter
installations (Canada) require the addition of a factory
approved drafthood. The drafthood must be installed
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Model LG & LD Pool and Spa Heater
Page 5
without modification and in accordance with all local,
state, provincial and national codes.
Proper ventilation of exhaust and combustion air
are essential for the safe operation of the heater.
Manual Shutoff
Valve
2D. Combustion and Ventilation Air
Supply
Gas Supply
Inlet
Union
All indoor installations must have openings to
outside air for combustion, ventilation, and dilution of
flue gases from inside the building (see Figure 2 and
Table 1). Waterpik Laars does not recommend indoor
installations that do not provide combustion air from
outside the building.
T-Fitting
To
Equipment
Inlet
3" Min.
(76 mm)
Nipple
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/CGA B149.
Waterpik Laars 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.
If the heater is installed in a residential garage, or
where flammable vapors will be present, the
burners must be 18 inches (457 mm) above the garage
floor. Refer to the latest edition of the National Fuel
Gas Code for more information. In Canada, refer to the
latest edition of the Gas Installation Code, CAN/CGA
B149.
Cap
Figure 5. The proper design for a sediment trap / drip
leg.
a. High altitude (H) - 3,000 to 6,000 feet (915 to
1,830 m) for natural gas and 5000 to 10,000
feet (1525 to 3050 m ) for propane gas.
b. High altitude (J) - 6,000 to 10,000 feet (1830
to 3,050 m)
3. In Canada, the heater rating plate is marked for
specific altitude requirements: lo altitude is 0 to
2,000 feet (0 to 610 m) and high altitude (H) is
2,000 to 4,500 feet (610 to 1,370 m) above sea
level for natural gas and 0 to 4500 feet (0 to 1370
m) for propane gas.
2E. Gas Supply and Piping
2E-1. General Instructions
Review the following general instructions before
continuing the installation.
4. Use the figures in Table 3 to size the gas inlet
piping from the gas meter to the heater. Check all
local codes for compliance before installing the
heater.
WARNING
Do not convert this heater from natural gas to
propane gas, or propane to natural. Field
conversion could create carbon monoxide gas
which can cause property damage, serious
injury, or death.
Table 3. Natural Gas Pipe Size Requirements
Distance from Gas Meter
0-50 feet
(0-15 m)
50-100 feet
(15-30 m)
100-200 feet
(30-60 m)
Heater
Size
in. (mm)
in.
(mm)
in.
(mm)
125
3/4 (19)
1
(25.4)
1
(25.4)
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- B149.1 or .2 and all local
codes that apply.
175
250
1
1
(25.4)
1
(25.4)
1-1/4
1-1/4
1-1/2
1-1/2
(31.75)
(31.75)
(38)
(25.4) 1-1/4 (31.75)
325 1-1/4 (31.75) 1-1/4 (31.75)
400 1-1/4 (31.75) 1-1/2
(38)
(38)
Notes:
2. Check the rating plate to make sure the heater is
fitted for the type of gas being used. Waterpik
Laars heaters, as 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 gas in the United States.
Or if so ordered, at higher altitudes. For higher
altitudes, the heater manifold is marked with a
tag or sticker indicating one of the following high
altitude operation codes:
1. These numbers are for natural gas (0.65 Sp. Gr.) and are
based on 1/2 inch (13 mm) 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
(13 mm) minimum diameter.
2. Check supply pressure and local code requirements
before proceeding with work.
3. Pipe fittings must be considered when determining gas
pipe sizing.
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WATERPIK TECHNOLOGIES INC.
2F. Electrical Wiring
Page 6
Table 4. Gas Supply Pressure Requirements
Supply Pressure
Water Column
Natural Gas
in. (mm)
Propane Gas
in. (mm)
Caution
Label all wires prior to disconnection when
servicing controls. Wiring errors can cause
improper and dangerous operation.
Verify proper operation after servicing.
Minimum
Maximum
5.5 (140)
10.0 (254)
10.0 (254)
14.0 (356)
5. Install a sediment trap (drip leg) ahead of the gas
controls (see Figure 5). Fit the trap with a
Attention
Au moment de l'entretien des commandes,
étiquetez tous les fils avant de les débrancher.
Des erreurs de câblage peuvent entraîner un
fonctionnement inadéquat et dangereux.
threaded cap which can be removed for cleaning.
6. Install a manual gas shutoff valve for service and
safety. Do not use a restrictive gas cock. DO
NOT USE FLEXIBLE GAS PIPING.
2F-1. General Information (LD Only)
Wiring connections must be made exactly as
shown in the wiring diagram found on the inside of the
heater (see Figures 6 and 7 for typical examples) . The
heater must include a definite means of grounding.
There is a bonding lug on the right side of the heater,
where a bond wire must be attached.
7. 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.
The heater comes factory-wired intended for
use with 240 Volt, 60 Hz AC field electrical supply.
To use 120 Volt, 60 Hz AC requires rewiring of the
heater. This should be done by a certified electrician
only, as with all wiring. To wire the heater for 120
Volt, 60 Hz AC, follow the alternate 120V wiring
method depicted in Figure 6. Additionally, the ignition
control module must be rewired. The wire from the
terminal marked IGN/240 must be removed from that
terminal and placed on the terminal marked IGN/120.
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
Permanent damage to the gas valve will occur
if the following procedures are not followed.
8. 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 4.
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 4.
To wire the Laars Lite 2 model LD heater to a
120V or 240V /60 Hertz (Hz) electrical source:
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.
1. Remove the screw located to the lower right side
of the transformer and open the hinged cover of
the wiring enclosure.
Caution
2. Connect the wires from the power source to the
leads on the right side of the heater in the space
behind the ignition control (see Figure 8). Be sure
to follow the wiring diagram on page 7 to config-
ure the transformer for the correct input voltage.
Some leak test solutions (including soap and
water) may cause corrosion or stress cracking.
Rinse the piping with water after testing.
2E-2. Special Precautions for Propane
Gas
3. Attach the ground wire to the green ground screw
located on the back panel of the wiring enclosure.
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.
4. Close the cover of the wiring enclosure and
replace the screw to hold it in place.
5. Connect a bonding wire (8 ga copper) to the
bonding lug on the right side of the heater.
NOTE: No external junction box is required.
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Model LG & LD Pool and Spa Heater
Page 7
MODEL LD WIRING DIAGRAM
NOTE:
IF ORIGINAL WIRE SUPPLIED WITH HEATER
MUST BE REPLACED, APPLIANCE WIRING
MATERIAL RATED AT 105 OC SHALL BE USED.
HSI IGNITION WIRE
OFF
FACTORY WIRED - 120 V/240 V
FIELD WIRED - 120V /240V
FACTORY WIRED - 24 V
POOL
SPA
WIRING SHOWN AS
SHALL USE
APPLIANCE WIRING MATERIAL RATED AT 200 OC.
REMOTE
CONNECTOR
FIREMAN
SWITCH
BK
TRANSFORMER
FUSIBLE
LINK
ELEC.
FUSE
120-240 V
CONNECTION
LIMIT
LIMIT
W
W
W
W
BK
W/R
W/BK
R
BK
R
Y
240V
60 Hz
G/Y
WATER
TEMP
SENSOR
PRESSURE
SWITCH
SINGLE
PHASE
R
G
WIRE TO IGN/120
FOR 120 VOLTS
ATTACH
GROUND
WIRE
Y/BK
W
IGN/120
IGN/240
(LI)
(L2)
IGN
WIRE TO IGN/240
FOR 240 VOLTS
BK
HERE
W
W
R
HONEYWELL
GAS VALVE
IGNITION CONTROL
(FENWAL)
0533
FS
TH
VALVE
BR
ALTERNATE 120 V WIRING
MV1
MV2
TRANSFORMER
120-240V / 24 V BK
GND
Y
BK
W/R
W/BK
R
FLAME SENSE ROD
W
R
Y
G
ATTACH
BK
GROUND
WIRE
IGNITER
R
(L1)
(L2)
a) Connection Diagram
HERE
L2
O
L1
240VCONNECTION
SHOWN
Y
TRANSFORMER
24 V
R
BK
W
BR
Y
R
O
-
-
-
-
-
-
Black
White
Brown
Yellow
Red
135O F
HI-LIMIT
SWITCH
FUSIBLE
LINK
150O F
HI-LIMIT
SWITCH
PRESSURE
SWITCH
FIREMAN
SWITCH
CONNECTOR
ELECTRICAL
FUSE
1-25 AMP
Orange
Y/BK - Yellow & Black
W/BK - White & Black
W/R
G/Y
-
-
White & Red
Green & Yellow
SPA SET POINT
POOL SET POINT
OFF
BK
CIRCUIT
BK/Y
SEN
SEN
GND
W
W
WATER TEMPERATURE
SENSOR
TH
GND
FS
VALVE
W
L2
IGN
L1
IGN120
or
IGN240
IGNITION
CONTROL
W
H/W GAS VALVE
IGNITOR
FLAME SENSOR
BR
Y
MV1
MV2
W
b) Schematic Diagram
Figure 6. LD Connection/Schematic Wiring Diagram.
H0236300-
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WATERPIK TECHNOLOGIES INC.
Page 8
efficient operation by removing any residual heat
contained in the heat exchanger back to the pool.
2F-2. Auxiliary Time Clock Wiring
If you install a time clock to control the filter
(LD)
pump operation, it is recommended that the time clock
have its own low voltage (Fireman’s) 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
Caution
Do not provide power to the heater from the
high voltage side of the time clock. Doing so
may cause damage to the heater or
surrounding plumbing.
0,//,92/7ꢀ+($7(5ꢀ:,5,1*ꢀ',$*5$0
High
Limit
Switch
High
Limit
Switch
TEMP. CONTROL
On
Off
Connection
Diagram
Min
Max
BK - Black
W
Y
-
-
-
-
White
Yellow
Red
O
O
W
W
R
O
Orange
Fireman
Switch
BK
Connection
BK
W
W
Y
Y
BK
Y
Fusible
Link
Pressure
Switch
W
Y
TH
BK
Y
PP/TH
W
Y
PP
Pilot
Gen
Piezo
Sparker
R
W
Pilot
IF ANY OF THE ORIGINAL WIRE AS
SUPPLIED WITH THE HEATER MUST BE
REPLACED, APPLIANCE WIRING
MATERIAL RATED FOR 105°C MUST BE
USED. WHEREMARKEDTHUS
Piezo
Sparker
APPLIANCE WIRING MATERIAL FOR
200°CMUSTBEUSED.
_
W
+
R
To Pilot
Generator
PP
Y
Y
PP/TH
Pilotstat
Power
Unit Coil
W
TH
BK
TH/PP
BK
Valve
Operator
Coil
CIRCUIT
PP
Y
H0166000G
Figure 7. LG Connection/Schematic Wiring Diagram
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Model LG & LD Pool and Spa Heater
Page 9
2F-3. Remote Operation
(Model LD Only)
The Laars Lite 2 pool/spa heater controls can
be wired for remote operation. The CS-02 remote
control permits switching from one temperature
controller to the other and turning the heater on and
off from a remote location. The CS-04 includes the
same features as the CS-02 plus a remote tempera-
ture controller. Contact Waterpik Laars for further
information. Reference part numbers CS-02 and
CS-04.
An interrupt (on/off) type remote can be
connected by removing the jumper wire on the terminal
block located in the control compartment (see Figure 6)
and connecting the two wires from the remote to the
two terminals on the terminal block. This type of
remote control will turn the heater on or off, but will
not switch between the two temperature controllers on
the temperature control panel or allow for temperature
adjustments.
Figure 8. Field Wiring Connections (LD).
To connect a 3-wire remote (not supplied by
Waterpik Laars) to a Laars Lite 2 LD heater, order a
wire harness assembly (part No. E0120000) which
connects to the temperature control panel. Installation
instructions are included with the wire harness assem-
bly.
Consult with Waterpik Laars Service Department
with questions about installing remotes other than
Waterpik Laars.
2G. Water Flow System
2G-1. Flange Installation
The heater has 2" NPT universal header cou-
plings. You can connect threaded 2" NPT iron pipe,
unthreaded 1-1/2" iron pipe, 1-1/2" or 2" copper pipe
without an adapter (see Figure 10).
Plastic piping (PVC Schedule 40) can be con-
nected to the heater if local codes allow it, by using the
CPVC nipples included with your heater.
Figure 9. Time Clock Wiring.
To install a time clock auxiliary switch into the
heater wires (see Figure 9):
1. Remove heater door.
2. Remove the factory installed wire between
terminals 1 and 2 on the terminal strip (see Figure
9).
To install plastic piping (see Figure 11):
1. Remove CPVC nipples from plastic bag.
3. Connect the wires from the time clock auxiliary
switch to the two terminals. Use American Wire
Gage (AWG) No. 14 gauge stranded copper wire
with a temperature rating of 221°F (105°C) or
greater.
2. Screw CPVC nipples into metal flange until tight,
using teflon tape on plastic threads.
3. Attach PVC plumbing to CPVC pipes using PVC
to CPVC cement only.
The length of the wire between the heater and the
time clock should not exceed 10-15 feet (4.57 m). The
contact points of the time clock switch should be silver,
or a low resistance alloy.
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WATERPIK TECHNOLOGIES INC.
Page 10
2G-2. Reversible Water Connections
Waterpik Laars ships the Laars Lite 2 heater with
the water connections on the right side. The Laars Lite
2 heater can be installed with the water connections on
either side. It could be necessary, or helpful, to switch
the connections to the left side to improve access for
installation and service. Perform this modification
before installing the heater using the following proce-
dures:
REAR RAIN SHIELD
PANEL OMITTED ON
CANADIAN MODELS
TRANSITION PLATE
TOP OMITTED ON US
MODELS
Figure 10. Piping installation.
RUBBER
JACKET/PLUG
GROMMET
Figure 11. Plastic piping connections.
Figure 12. Heat exchanger reversal.
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Model LG & LD Pool and Spa Heater
Page 11
1. Remove heater door.
(see Figure 14). Pull pressure switch tube through
the hole in the vestibule cover and into the vesti-
bule (controls compartment), then pull thermostat
bulb assembly through same hole (see Figure 15).
2. If there is a vent cap or drafthood (indoor) on top
of the heater, remove it.
3. Remove all 8 hex-head screws fastening the top
and lift the top assembly straight up (see Figure
12).
12. When removing the heat exchanger from the
heater, the end baffles of the heat exchanger must
be removed. There are two baffles covering part
of the front and rear tubes of the heat exchanger.
Each baffle is held in place by two screws which
mount to the top of the combustion chamber wall.
Remove the screws and the baffles before at-
tempting to lift the heat exchanger out of the
heater (see Figure 16).
4. Remove rainshield assembly and set it aside.
5. Remove screws that fasten the gap closures to the
jacket and put them aside. Remove gap closures.
6. Remove the screws securing the two flue collec-
tor hold down clamps and remove the clamps (see
Figure 13). Remove flue collector.
7. Remove the three rubber jacket/plug grommets
and drain plugs (see Figure 12). One is located
under the water connections on the right side. The
other two are on the left side toward the front of
the heater.
Caution
It may be necessary to have help lifting the
heat exchanger out and replacing it.
8. Tag and disconnect the white wire on the pressure
switch (PS) and the white wire on the Fireman's
switch terminal (see Figure 6 or 7) which leads to
the high limit switch.
9. Remove plastic tie wraps and pull the white wires
out of the front compartment through the vesti-
bule cover and coil them on the heat exchanger.
10. Unscrew the brass compression fitting securing
the pressure switch to the inlet/outlet header.
Remove tube from header and gently bend it out
of the way.
11. Loosen the screw securing the temperature sensing
bulb retainer bracket. Slide the retainer bracket off
the bulb flange and remove the bulb from the header
Figure 14. Temperature sensing bulb.
HOLD DOWN
CLAMP
IN/OUT HEADER
(U.S. MODELS
ONLY)
LEFT
VESTIBULE
COVER
RIGHT
VESTIBULE
COVER
BRACKET
Figure 13. Flue collector hold-down brackets.
FRONT
PLASTIC BUSHING
Figure 15. Vestibule covers.
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WATERPIK TECHNOLOGIES INC.
Page 12
20. Connect the white wire labeled PS to the pressure
switch and the other white wire to its original
location on the Fireman's switch.
HeatExchanger
End Baffles
21. Reinstall the drain plugs and tighten securely.
Replacejacket/pluggrommets.
HeatExchanger
Combustion
ChamberWall
22. Install the flue collector assembly. Be sure the
front and rear panels of the flue collector are
installed into the grooves on the front and rear
combustion chamber heat shield panels. Be sure
the sheet metal panels are not pinching any wires.
23. Attach the flue collector hold down clamps to the
clips located under the two center header bolts.
24. Replace the gap closures and tighten the screws
securely.
Figure 16. Heat exchanger and end baffles.
25. Double-check to make sure the wiring is not
pinched against sharp edges, or resting on the flue
collectorassembly.
13. Lift the heat exchanger assembly out of the
heater. Reinstall heat exchanger 180 degrees
(inlet/outlet header left) from it's original posi-
tion.
26. Reinstallrainshieldassembly.
27. Replace the top assembly. Make sure the tabs are
outside the heater jacket. Fasten the top assembly
with the hex-head screws.
14. After replacing the heat exchanger into the heater,
the end baffles must be replaced. Each one is
held in place by two screws which mount to the
top of the combustion chamber wall. Reinstall the
baffles on the front and rear of the heat exchanger
before continuing with the "Reversible Water
Connections"procedure.
28. Install plastic tie wraps on wiring in the vestibule
(controlscompartment).
29. Install heater door.
30. Reinstall the vent cap or drafthood, if one was
removed.
15. Remove pressure switch retainer (plastic cable
clamp) from the inner panel (allow pressure
switch to float).
2G-3. Check Valve Installation
Install a check valve if there is any chance of back-
siphoning when the pump stops. Do not install any other
valve in the piping between the heater outlet and the
pool, unless it is being used as a diverter valve.
16. On U.S. models reroute pressure switch tube and
thermostat bulb assembly through hole in left side
of vestibule cover in reverse order. Canadian
models have no cover on the left side of the
vestibule. Relocate the pressure switch tube and
temperature sensor through the open side of the
vestibule.
2G-4. Chlorinators, Ozone Generators,
and Sanitizing Chemicals
The Waterpik Laars Lite 2 heater is manufac-
tured with materials that are not compatible with high
concentrations of ozone, chlorine, bromine, or other
sanitizing chemicals. Heater damage caused by exces-
sive chemicals or improper ozonization is not covered
by the Waterpik Laars warranty. Be sure to adhere to
thefollowing:
17. Reinstall the temperature sensing bulb in the
header, and fasten it with the retainer bracket and
screw.
18. Reinstall the compression fitting at end of pres-
sure switch tube into inlet/outlet header and
tighten the fitting.
•
When ozone is injected upstream of the heater,
install an offgas mixing chamber, or an ozone
bypass system between the heater and the ozone
injector to prevent ozone and air from entering
the heater.
19. Route the white wiring from the high limit
switches beside the heat exchanger and down to
the original location following the pressure switch
tubing. Secure white wires to the pressure switch
tube with plastic wire ties.
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Model LG & LD Pool and Spa Heater
Page 13
•
•
When chemical feeders are used, plumb the
feeder downstream of the heater and install an in-
line check valve between the heater and the feeder
(a minimum of 18" is required between the heater
and the check valve).
Never deposit chemicals directly in the pool
skimmer.
2G-4a. Water Chemistry
Proper chemical balances are necessary for
sanitary bathing conditions as well as ensuring your
heater's long life. Be sure to keep your chemical levels
within the values indicated in Table 7. Waterpik
Laars does not warrant heat exchangers damaged
by corrosive chemical levels or excess dissolved
solids in pool or spa water.
For spas, it is also necessary to perform water
changes in addition to chemical treatment. It is recom-
mended to change the spa water every 60 days for light
usage and every 30 days if usage is heavy.
Figure 17. Thermometer and pressure relief valve.
2G-6. Adjusting the Pressure Switch
Caution
The pressure switch should be adjusted to turn
the heater off when the pump is off. Setting
the switch to close at too low of a flow can
damage the appliance. Adjust the switch to
turn the heater off, not on.
Table 7. Mineral Concentration Levels
Test
Recommended Level
Free chlorine
Bromine
1.0 to 3.0 ppm
3.0 to 5.0 ppm
7.2 to 7.8
pH
The pressure switch is preset at the factory for
activation at 2 psi (14 kPa). Adjust the pressure switch
only if any part of the filter system piping is 3 feet
(0.91 m) or more above the top of the heater jacket.
Do not adjust the pressure switch if the heater is
installed more than 15 feet (4.57 m) below or 6 feet
(1.83 m) above the pool surface. Consult your local
Waterpik Laars representative for recommendations.
On some installations, the piping from the heater
to the pool is very short. The back pressure could be
too low to trigger the pressure switch. If this happens,
it may be necessary to install a directional fitting or
elbows where the return line enters the pool. This will
increase back pressure enough for the heater to operate
properly.
Total alkalinity (TA)
Calcium hardness (CH)
80 to 120 ppm
200 to 400 ppm
Langelier saturation index (LSI) -0.5 to +0.5
Total dissolved solids (TDS)
Cyanuric acid
Less than 2000 ppm
30 to 150 ppm
0 ppm
Copper
2G-5. Pressure Relief Valve
A pressure relief valve is not furnished with the
Laars Lite 2 heater. However, it is recommended that a
pressure relief valve be installed and may even be
required by local codes.
To install a pressure relief valve, remove the 3/4
inch (19 mm) brass plug located on the top of the inlet/
outlet header (see Figure 17). Install the pressure relief
valve in the threaded hole from which the plug was
removed. The pressure rating of the valve should be at
or below the lowest working pressure of any compo-
nent in the filter system. Any pressure relief valve
installed must comply with provisions of the Standard
described in ANSI Z21.22 for the United States, or
CAN1-4.6 in Canada.
Make sure the pool filter is clean before making
any pressure switch adjustment: A dirty filter will
restrict the water flow and the pressure switch cannot
be adjusted properly. To adjust the pressure switch:
1. Set the control panel rotary switch (LD) or the
control panel rocker switch (LG) to the OFF
position (see Figure 18).
2. Set the Pool temperature control to the Max
position.
3. Turn filter pump on. If a two-speed pump is used,
make sure it is at high speed.
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WATERPIK TECHNOLOGIES INC.
Page 14
2G-7. Automatic Flow Control Valve
The automatic flow control valve maintains the
proper flow through the heater at rates up to approxi-
mately 125 Gallons Per Minute (GPM) (474 liters per
minute [LPM]). If the system filter-flow rate is higher
than approximately 125 GPM (474 LPM), install a
manual bypass valve (see Figure 20), then perform a
temperature rise test (see Section 2G-8) and adjust the
flow using the bypass valve until the proper tempera-
ture rise is obtained.
a) Model LD Temperature Control
2G-8. Temperature Rise
A temperature rise test confirms proper water
flow through the heater. The temperature rise is the
difference between the temperature of the pool or spa
water before and after heating, as measured in the
header. Perform the following temperature rise test
when the installation is complete:
1. Make sure the pool filter is clean.
b) Model LG Temperature Control
2. Set the rotary switch (LD) or rocker switch (LG)
on the temperature control panel (see Figure 18)
to OFF.
Figure 18. Temperature controls.
3. Turn the filter pump off.
4. Remove the drain plug located on the inlet/outlet
header of the heater and replace it with a Pete's
plug (see Figure 17).
5. Insert a pocket thermometer (see Figure 17)
through the Pete's plug into the header.
6. Turn the filter pump on and wait 3 minutes. The
heater remains off. This allows water from the
pool to reach the heater.
7. Record the temperature indicated by the ther-
mometer (cold water).
Figure 19. Pressure switch adjustment.
8. Turn the heater ON following the lighting in-
structions found on the inside of the heater.
NOTE: Heater should not be allowed to fire on
lowspeed.
9. Allow the heater to run for about 3 minutes.
Record the new temperature reading (heated
water).
4. Turn rotary switch (LD) or rocker switch (LG) to
ON. Heater should start.
5. Pry out the top rubber dust plug on the top of the
pressure switch.
10. Subtract the first temperature reading (cold
water) from the second temperature reading
(heated water). The difference between the two
readings is the temperature rise. The temperature
rise should be within the range shown in Table 6.
Table 6. Temperature Rise and Minimum Flow Rates
6. Use a 7/32 inch (5.55 mm) Allen wrench to turn
the adjustment screw very slowly clockwise until
the heater goes off (see Figure 19).
7. Slowly turn the pressure switch adjustment screw
counterclockwise one-quarter turn. The heater
should come back on.
Minimum
Minimum
Maximum
Size
GPM (LPM)
°F
(°C)
°F
(°C)
8. Check the adjustment by turning the filter pump
OFF. The heater should shut off immediately. If
it does not, restart the filter pump and repeat
Steps 6 and 7. Check the adjustment again.
125
175
250
325
400
20
20
25
30
30
(76)
27
33
33
28
30
(15)
(19)
(19)
(16)
(17)
36
42
42
38
39
(20)
(24)
(24)
(21)
(22)
(76)
(95)
(114)
(114)
9. Return the pool temperature control to the desired
temperature.
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Model LG & LD Pool and Spa Heater
Page 15
Note: When using metal pipe as heat sink, join metal and PVC/CPVC, using metal male and PVC/CPVC female connection.
Figure 20. Typical installation.
2G-9. Adjusting the Manual Bypass Valve
After the manual bypass valve is installed, use
the following procedures to adjust the bypass valve:
11. If the temperature rise is below the minimum
range indicated, two possibilities arise:
a. The supply gas volume is too low.
1. Clean pool filter.
b. The system's water flow exceeds 125 GPM
(474 LPM), and requires a manual bypass
valve for proper operation (see Figure 19).
2. Remove drain plug located on the inlet/outlet
header of the heater and replace it with a Pete's
plug.
12. If the temperature rise is above the maximum,
there is not enough water flowing through the
heater. Check for clogging in the water filter or
restriction in the water pipes.
3. Insert a pocket thermometer (see Figure 17)
through the Pete's plug into the header.
4. Close manual bypass valve.
5. Turn rotary switch (LD) or the rocker switch
(LG) on the temperature control to the OFF
position.
6. Repeat steps 6 through 10 of the temperature rise
test (see Section 2G-8).
7. If the temperature rise is below the minimum
stated in Table 6, open the manual bypass valve
until temp rise climbs between the min. and max.
range for your size heater. If the minimum
temperature rise stated in Table 6 cannot be
reached with the manual bypass fully open, then
the gas supply volume is too low.
8. If the temperature rise is above the maximum,
there is not enough water flowing through the
heater. Check for clogging in the water filter or
restriction in the water pipes.
Caution
Operation with the temperature rise above
maximum or below the minimum can damage
the heater and may void the warranty.
13. If the temperature rise is within the correct range,
complete the procedure as follows:
a. Turn heater off.
b. Wait 3 minutes, turn filter pump off.
c. Remove thermometer and Pete's plug.
d. Replace the drain plug.
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WATERPIK TECHNOLOGIES INC.
Page 16
9. Once the temperature is within the correct range,
safety wire the handle of the manual bypass valve
in place and tag the valve to prevent change in the
water flow.
WARNING
Vent pipes, drafthoods, and heater tops get
hot! These surfaces can cause serious burns.
Do not touch these surfaces while the heater
is in operation. Adding a vent cap reduces the
temperature on the top.
SECTION 3.
Operating Instructions
WARNING
3A. General Information
For your safety, when starting the heater, keep
your head and face well away from the lower
firebox opening to prevent any risk of personal
injury.
With any new pool or spa installation, operate the
filter pump with the heater off long enough to com-
pletely clean the water. This will remove any installation
residue from the water. Clean the filter at the end of this
operation before starting the heater. When raising the
temperature of a cold pool, remove all time clock
settings. This lets the filter system and heater operate
continuously until the water reaches the temperature
setting on the temperature control. When that happens,
the heater will automatically shut off, but the filter pump
will keep running.
3B. Lighting and Shutdown Procedures
NOTE: If your LP tank runs out of fuel, turn off
gas at the heater. After the tank is refilled, the
heater must be relit following the instructions
found on the inside of the heater. DO NOT
attempt repairs on the gas control or heater.
Tampering is dangerous and voids all warranties.
Caution
Do not use this heater if any part has been
under water. Immediately call a qualified
service technician to inspect the heater and
replace any part of the control system and any
gas control which has been under water.
3B-1. Model LD (see Page 17).
3B-2. Model LG (see Page 18).
Attention
3C. Setting the Temperature Control
The temperature control (see Figure 18) is
calibrated at the factory and covers a range from
approximately 70°F to 104°F (21°C to 40°C). Use an
accurate pool thermometer to determine the best water
temperature for your uses.
N'utilisez pas cet appareil s'il a été plongé
dans l'eau, même partiellement. Faites
inspecter l'appareil par un technicien qualifié
et remplacez toute partie du système de
contrôle et toute commande qui ont été
plongés dans l'eau.
The Laars Lite 2 model LD has dual temperature
controls, which allows two different temperature
settings, selected by the rotary switch in the middle of
the panel. One control can be set for normal use and
the other for standby; or one can be set for pool and
the other for a spa. Placing the rotary switch in the
middle turns off the heater (see Figure 18). The model
LG has only a single control and is set similarly to the
LD above.
Caution
Should overheating occur or the gas supply
fail to shut off, turn off the manual gas control
valve to the heater.
Attention
En cas de surchauffe ou si l'alimentation en
gaz ne s'arrête pas, fermez manuellement le
robinet d'arrêt de l'admission de gaz.
IMPORTANT: The temperature controls cannot
be calibrated in the field. If the control is faulty, shut
down the heater and have a qualified service technician
replace the control. DO NOT use the thermostat switch
to completely shut down the heater.
Caution
Keep all objects off the top of the heater.
Blocking air flow could damage the heater,
and may void the warranty.
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Model LG & LD Pool and Spa Heater
Page 17
3B-1. Model LD (Direct Ignition)
FOR YOUR SAFETY READ BEFORE OPERATING
WARNING: If you do not follow these instructions exactly, a fire or explosion
may result, causing property damage, personal injury or loss of life.
A. This appliance does not have a pilot light. It is
equipped with an ignition device which
automatically lights the heater. Do NOT try to
light the burners by hand.
• If you cannot reach your gas supplier, call
the fire department.
C. Use only your hand to push in or turn the
gas control knob. Never use tools. If the
knob will not push in or turn by hand, don't
try to repair it, call a qualified service
technician. Force or attempted repair may
result in a fire or explosion.
B. BEFORE OPERATING, smell all around the
appliance area for gas. Be sure to smell next
to the floor because some gas is heavier than
air and will settle on the floor.
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance
D. Do not use this appliance if any part has
been under water. Immediately call a
qualified service technician to inspect the
appliance and to replace any part of the
control system and any gas control which
has been under water.
• Do not touch any electric 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.
OPERATING INSTRUCTIONS
1. STOP! Read the safety information above on
this label.
9. Replace control access panel
10. Turn on all electric power to appliance.
2. Set the thermostat to lowest setting and turn
appliance switch to "OFF".
3. Turn off all electric power to the appliance.
11. Set thermostat to desired setting and turn
appliance switch from "OFF" to either
"POOL" or "SPA".
4. This appliance is equipped with an ignition
device which automatically lights the heater.
Do not try to light the burners by hand.
12. If the appliance will not operate, check that
the filter pump is on, the filter is clean and
water is flowing to the pool. Otherwise, follow
the instructions "To Turn Off Gas To
Appliance" and call your service technician
or gas supplier.
5. Remove the heater door.
6. Turn gas control knob clockwise
"OFF".
to
7. Wait five (5) minutes to clear out any gas.
Then smell for gas, including near the floor. If
you smell gas, STOP! Follow "B" in the safety
information above on this label. If you don't
smell gas, go to next step.
8. Turn gas control knob counterclockwise
to "ON".
TO TURN OFF GAS TO APPLIANCE
1. Set the thermostat to lowest setting and turn
appliance switch to "OFF".
3. Turn gas control knob clockwise
"OFF".
to
2. Turn off all electric power to the appliance if
service is to be performed.
4. Replace control access panel.
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WATERPIK TECHNOLOGIES INC.
Page 18
3B-2. Model LG (Standing Pilot)
FOR YOUR SAFETY READ BEFORE OPERATING
WARNING: If you do not follow these instructions exactly, a
fire or explosion may result causing property damage, personal
injury or loss of life.
A. This appliance has a pilot which must be
lighted by a push button sparker. When
lighting the pilot, follow these instructions
exactly.
• If you cannot reach your gas supplier, call
the fire department.
C. Use only your hand to push in or turn the
gas control knob. Never use tools. If the
knob will not push in or turn by hand, don't
try to repair it. Call a qualified service techni-
cian. Force or attempted repair may result in
a fire or explosion.
B. BEFORE LIGHTING, smell all around the
appliance area for gas. Be sure to smell next
to the floor because some gas is heavier
than air and will settle on the floor.
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
D. Do not use this appliance if any part has
been under water. Immediately call a quali-
fied service technician to inspect the appli-
ance and to replace any part of the control
system and any gas control which has been
under water.
• Do not touch any electric 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.
OPERATING INSTRUCTIONS
1. STOP! Read the safety information above.
7. Push the button of the sparker, repeating until
confirming that pilot lights, by observing
reflection on burner tray mirror.
2. Set the thermostat to lowest setting and turn
appliance ON/OFF switch to "OFF".
8. Continue to hold the control knob down for
about one (1) minute after the pilot is lit. If it
goes out, repeat steps 3 through 8.
3. Turn gas control knob clockwise
stops at "OFF" position.
until it
4. Wait five (5) minutes to clear out any gas. If
you then smell gas, STOP! Follow "B" in the
safety information above. If you don't smell
• If knob does not pop out when released,
stop and immediately call your service
technician or gas supplier.
PILOT
gas go to the next step.
BURNER
• If the pilot will not stay lit after several tries,
turn the gas control knob to "OFF" and call
your service technician or gas supplier.
5. To find pilot—follow gas
line from gas valve to pilot
location.
9. Turn gas control knob counterclockwise
to "ON".
6. Turn knob on gas valve
counterclockwise
to
"PILOT" then push control
10. After replacing control compartment access
panel, set thermostat to desired setting and
turn appliance ON/OFF switch to "ON". Valve
has built-in delay before coming on.
knob all the way and hold down.TOVALVE
11. If the appliance will not operate, check that
the filter pump is on, that the filter is clean
and water is flowing to the pool. Otherwise,
follow the instructions "To Turn Off Gas To
Appliance" and call your service technician or
gas supplier.
TO TURN OFF GAS TO APPLIANCE
1. Set the thermostat to lowest setting and turn
appliance ON/OFF switch to "OFF".
2. Turn gas control knob clockwise
until it
stops at "PILOT". Then press down slightly
on knob while turning clockwise
"OFF". Do not force.
to
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Model LG & LD Pool and Spa Heater
Page 19
6. Use compressed air to blow out any standing
3D. Seasonal Care
water remaining in the heat exchanger.
Caution
7. Grease the threads on the drain plugs and rein-
stall plugs, but do not tighten.
Do not operate this heater outdoors at
temperatures below 20 degrees Fahrenheit
(°F) (-7 degrees Celsius [°C]).
8. Disconnect the pressure switch from the siphon
loop (copper tubing) (see Figure 22).
3D-1. Spring and Fall Operation
During periods when the pool is only going to be
used occasionally, turn the temperature control down
to the MIN setting. This prevents the pool from water
from becoming chilled, and minimizes the time re-
quired to raise the pool water back up to the desired
temperature.
In areas subject to only short freeze periods, turn
off the heater and run the pump continuously for the
length of the freeze period.
3D-3. Spring Start-up
To restart the heater in the Spring, have a profes-
sional service technician reassemble the heater as
follows:
1. Fill the siphon loop with approximately 5cc of
SAE 50, non-detergent oil. Attach the copper
tubing to the pressure switch (see Figure 22).
2. Tighten the drain plugs.
3. Turn on the filter pump and circulate water
through the heater for 5 minutes. Check for leaks
whilecirculating.
If the heater is not going to be used for a long
period of time, shut it down completely. Follow the
instructions found on the inside of the heater, or pages
17(LD) or 18(LG) of this manual.
4. Turn on the main gas supply valve to the heater,
outside the heater jacket.
3D-2. Winterizing
5. Turn on the heater following the lighting instruc-
tions found on the inside of the heater, or pages
17(LD) or 18(LG) of this manual.
In areas where freezing temperatures occur in
winter, and the pool or spa will not be used, have your
service technician perform the following steps:
1. Turn off the main gas supply valve to the heater,
outside the heater jacket.
2. Remove heater door.
3. Shut down the heater following the shutdown
instructions found on the inside of the heater.
4. Remove the drain plug from the return header
(see Figure 21), loosen the drain plug from the
inlet/outlet header, and completely drain the
heater before the first frost.
5. After all water has drained from the heater,
remove the drain plug from the inlet/outlet side.
Check for mineral buildup in the openings.
Figure 22. Pressure switch copper tubing.
Figure 21. Heater drain locations.
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WATERPIK TECHNOLOGIES INC.
Page 20
•
•
•
•
•
•
Lack of awareness of impending hazard
Failure to perceive heat
3E. Water Chemistry
For notes on water chemistry please consult
sections 2G-4, 2G-4a and Table 7 on page 13 of this
manual.
Failure to recognize need to leave spa
Physical inability to leave spa
Fetal damage in pregnant women
3F. Spa/Hot Tub Safety Rules
WARNING
Unconsciousness resulting in a danger of drown-
ing
The following “Safety Rules for Hot Tubs,”
recommended by the U.S. Consumer Product
Safety Commission, should be observed when
using the spa.
3G. Swimming Pool Energy Saving Tips
Waterpik Laars offers the following recommen-
dations to help conserve fuel and minimize the cost of
operating your pool heater without sacrificing com-
fort.
1. Spa or hot tube 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.
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°
(3C°) , between 78°F and 82°F (25°c and 28°C),
will use as much as 40% more gas.
2. The drinking of alcoholic beverages before or
during spa or hot tub use can cause drowsiness
which could lead to unconsciousness, and subse-
quently result in drowning.
2. Carefully monitor the water temperature of your
pool in the summertime. You can reduce heater
usage due to warmer air temperatures.
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) maxi-
mum.
3. Find the proper setting on the pool heater tem-
perature control and use the TEMP-LOK to
discourage further adjustments.
4. Set the filter 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.
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 4F° (2C°).
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.
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. 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.
6. Persons taking any medication which induces
drowsiness (e.g., tranquilizers, antihistamines, or
anticoagulants) should not use spas or hot tubs.
7. Where possible, shelter the pool from prevailing
winds with well-trimmed hedges or other land-
scaping, cabanas, or fencing.
7. Prolonged immersion in hot water can induce
hyperthermia.
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.
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:
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Model LG & LD Pool and Spa Heater
Page 21
3. Inspect the electrical controls, specifically the
following:
3H. Periodic Inspection
WARNING
Improper installation or maintenance can
cause nausea or asphyxiation from carbon
monoxide in flue gases which could result in
severe injury, or death.
a. High limit controls.
b. Pressure switch.
c. Temperature control.
d. Automatic gas valve.
4. Inspect the venting system for blockage,
leakage, and corrosion.
3H-1. Owner Inspection
Waterpik Laars designs and constructs the Laars
Lite 2 heater to provide long performance life when
installed and operated properly under normal condi-
tions. The following basic guidelines are suggested for
yourinspection:
5. Check for spider webs in the pilot and main
burner orifices - especially at Spring start-up.
6. Conduct a normal operating cycle and observe
that the sequence proceeds as intended.
1. Keep the top and surrounding area of the heater
clear of all debris.
7. Inspect the external surfaces of the heat
exchanger tubes for black carbon soot buildup
by placing a mirror between and under the
burners when the heater is firing. Remove any
soot that has collected on the tubes, and
correct the cause.
2. Keep the heater area clean and free of all com-
bustible materials, flammable liquids and vapors,
as well as sanitization chemicals.
3. Do not use the heater if any part has been under
water. Immediately call a qualified professional
technician to inspect the heater and replace any
part of the control system which has been sub-
merged.
NOTE: After installation and first start-up,
check the heat exchanger for black carbon soot
buildup after the following periods of operation: 24
hours, 7 days, 30 days, 90 days, and once every 6
monthsthereafter.
N'utilisez pas cet appareil s'il a été plongé dans
l'eau, même partiellement. Faites inspecter
l'appareil par un technicien qualifié et remplacez
toute partie du système de contrôle et toute
commande qui ont été plongés dans l'eau.
Proper flames appear:
a. Blue in color.
b. 1 to 4 inches (25 to 102mm) high above
burner surface.
4. If the heater is equipped with a pressure relief
valve, check for corrosion in and around the
valve. With the filter pump on, lift the release
lever on the top of the valve to make sure that
water runs freely through it. If corrosion is found,
replace the pressure relief valve. When replacing
the valve, be sure that the pump is off. Install the
valve so that the discharge is directed away from
any area the may be damaged by water.
SECTION 4.
Parts List for Laars Lite 2 Heater
4A. General Information
5. Be sure all combustion air and ventilation open-
ings are not blocked.
To purchase parts or obtain a comprehensive
maintenance manual for the Laars Lite 2 heater,
contact your nearest Waterpik Laars dealer or
distributor. If they cannot supply you with what you
need, contact the Customer Service Manager,
Waterpik Laars, 21 Pimentel Ct, Novato, California,
94949, Telephone (415) 382-8220 extension 245.
3H-2. Professional Inspection
In addition, annual inspections by a qualified
professional technician are recommended to keep the
heater operating safely and efficiently through the years.
The following basic checks should be performed.
4B. Parts List
1. Check for loose or broken wires and terminal
connections.
The following three pages contain a parts list,
general exploded view and detailed exploded views to
aid in parts identification. Please refer to these pages
when ordering parts for your Laars Lite 2 pool heater.
2. Verify pressure switch operation by cycling
the spa pump on and off a few times. The
heater should go off immediately after the
pump stops.
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WATERPIK TECHNOLOGIES INC.
Page 22
Key
Model ORDER
Key
No
Model
No
ORDER
No
Description
No
PART NO
Description
PART NO
PILOT/IGNITER SYSTEM
Pilot, Main Burner Assembly, NAT
Pilot, Main Burner Assemby, LPG
Pilot Burner, NAT
Pilot Burner, LPG
Pilot Electrode
VENT SYSTEM
1
1
2
2
3
4
5
6
7
8
9
All
R0099100
R0099200
R0096700
R0096600
W0040000
W0036901
10418820
10457500
R0099000
R0037000
R0096800
R0323300
R0317200
59
60
61
61
62
62
63
63
64
64
65
66
67
68
Top Enclosure
Top Filler Plate (US Only)
Rainshield Kit (US Only)
125-400 R0343401-05
125-400 R0343701-05
125-400 R0318301-05
125-400 R0318311-15
125-400 R0316401-05
125-400 R0316406-10
125-400 10561501-05
125-400 10561511-15
125-400 10561401-05
125-400 10561411-15
125-400 10861901-05
125-400 10535301-05
All
All
All
All
All
All
All
All
All
All
All
All
Rainshield Kit (Canada Only)
Flue Collector Assembly (US Only)
Flue Collector Assembly (Canada Only)
Outdoor Vent Cap (US Only)
Outdoor Vent Cap (Canada Only)
Indoor Drafthood (US Only)
Indoor Drafthood (Canada Only)
Flue Transition Plate (US Only)
Adapter Plate
Pilot Generator
Ceramic Insulator Assembly
Burner, Main w/Pilot Bracket
High Voltage Lead Assembly
Pilot Tubing
Piezo Lighter Assembly
10 Pilot Condensate Shield - LG
11 Ignitor - LD
Clip
All
All
10211000
10726000
Flue Collector Hold Down Clamp
MAIN GAS ASSEMBLY
12 Burner Tray Assy, NAT - LG
12 Burner Tray Assy, LPG - LG
12 Burner Tray Assy, NAT - LD
12 Burner Tray Assy, LPG - LD
125-400 R0098601-05
125-400 R0098701-05
125-400 R0316901-05
125-400 R0319501-05
125-400 R0317001-05
WATER SYSTEM
69 Inlet/Outlet Header, 2"
All
All
All
R0056400
R0016800
R0058300
R0054600
R0057000
F0046100
F0011100
F0003100
R0050800
R0055000
10573500
S0078000
S0078200
F0031700
S0078100
R0316300
S0071100
P0019701
P0026800
P0027000
R0013100
69 Inlet/Outlet Header, Bronze, 2"
70 Return Header (Includes set of 9 gaskets)
70 ReturnHeader, Bronze (Includes set of 9 gaskets) All
13
14
14
14
14
15
15
16
17
18
19
19
19
19
19
Burner Tray, Shelf Only
Gas Valve, NAT - LG
Gas Valve, LPG - LG
Gas Valve, NAT - LD
Gas Valve, LPG - LD
Gas Orifice, NAT 0 - 3,000 ft alt. (EA.) (Note 1) All
Gas Orifice, LPG 0 - 5,000 ft alt. (EA.) (Note 2) All
Anti-Rotation Bracket
Mounting Bracket Assembly - LG
Burner, Main
All
All
All
All
R0096400
R0096900
R0317100
R0319600
L0032200
L0032900
10835900
10419200
L0052300
L0052200
L0006300
L0006400
L0006500
L0006600
71
72
73
74
Header Bolt Assembly (Set of 8)
Bolt for Headers, 2 1/2"
Washer for Headers
All
All
All
All
All
All
All
All
All
All
All
All
All
All
All
All
All
Nut for Headers
75 Header Gasket Assembly (Set of 18)
76 Flange & Gasket Assembly (Set of 2 )
All
All
All
125
175
250
325
400
77
78
79
80
81
Flange, 2"
Flange Gasket, 2"
Flange Sleeve, 2"
Flange Bolt
Burner Manifold
Burner Manifold
Burner Manifold
Burner Manifold
Flange Gasket, 1 1/2 - 2"
82 Rubber Grommet for Drain Plug
83 Grommet, Slitted (Not Shown)
84 Brass Connector Body
Burner Manifold
85 Brass Drain Plug 1/4"
86 Brass Plug, 3/4"
ELECTRICAL SYSTEM
20 Temperature Control Assembly - LG
All
All
All
All
All
All
All
All
All
All
R0058200
R0058000
10457300
R0099800
H0105300
R0011700
10457800
10594600
R0099900
H0166500
87 By-Pass Assembly w/o spring (Iron Cap)
87 By-Pass Assembly with spring (Bronze Cap)
21
22
23
24
Wire Harness
Plate Assembly
On-Off Switch
Temperature Control Label
125-400 10701401-05
All
All
All
All
All
All
125
175
250
325
400
All
88
89
90
91
91
92
By-Pass Valve Rod
Brass Nut (For Rod)
By-Pass Valve Disc
S0079800
F0048400
R0011500
10452200
10557400
F0041600
S0079900
S0061400
S0061300
S0061200
S0070100
R0011400
25 Temperature Control Assembly - LD
By-Pass Valve Control Cap (Iron)
By-Pass Valve Control Cap (Bronze)
Control Cap Bolts (2 Required)
26
27
28
29
Wire Harness Assembly
Plate Assembly
Knob, Single Bar
93 By-Pass Valve Spring, Purple
93 By-Pass Valve Spring, White
93 By-Pass Valve Spring, Red
93 By-Pass Valve Spring, Blue
93 By-Pass Valve Spring, Black
94 By-Pass Valve Gasket
Temperature Control Label
Key Nos. 30- 37 are for both R582 (LG) & R117 (LD)
30 Temperature Sensor
31 Protector Sleeve, Bulb
32 "O" Ring, Temperature Control Bulb
33 Thermostat Knob, Black
34 Stop Plate, "Temp-Lok"
35 Temperature Control Gasket
36 Bezel
37 Stop Plate Screw (Not Shown)
38 Temperature Sensor Retainer Bracket
39 Retainer Bracket Screw
All
All
All
All
All
All
All
All
All
All
R0011800
10444900
E0116400
R0010700
10583100
S0070000
S0069800
F0033300
10447300
F0009100
R0097600
R0013200
R0011300
R0015500
R0057800
R0023200
R0022700
R0023000
S0098900
10419300
10418400
10418300
R0012200
10479900
R0097800
R0344600
R0344500
R0059800
R0061100
10451200
10480000
95 Heat Exch. Tube Assy. (Incl. set of 18 gaskets)
125-400 R0018101-05
125-400 10697401-05
All
All
125
96
97
98
99
Heat Exchanger Baffle (8 Required)
Baffle Retainer
Heat Exchanger Support Clip (2 Required)
Flow Restrictors (2 Required) (Not Shown)
S0083900
10457000
S0000300
100 Heat Exchanger End Baffles (2 Required)
125-400 R0332301-05
40 Pressure Switch & Siphon Loop Assembly (2 PSI) All
FIREBOXCOMPONENTS
Combustion
41
41
41
42
Pressure Switch, 2 PSI
Pressure Switch, 1 PSI
Pressure Switch, 1-10 PSI
Siphon Loop Assembly
All
All
All
All
All
All
All
All
All
All
All
All
All
All
All
All
All
All
All
All
101 Complete
Chamber
Assy.125-400 R0316701-0
JACKETCOMPONENTS
102 Door with Latch
125-400 R0343601-05
125-400 R0343501-05
43 High-Limit Switch Assembly
103 Jacket Assembly, Less Top Assembly
104 Gap Closure, Inlet/Outlet
105 Gap Closure, Return
44
45
46
47
High-Limit Switch, 135° F
High-Limit Switch, 150° F
High-Limit Switch Retainer Boot
High-Limit Switch Wire Harness
All
All
All
All
All
R0344300
R0344400
F0035300
F0032300
F0056600
106 Button Plug, 1-3/4"
107 Button Plug, 7/8"
48 High-Limit Switch Retainer Clip
49 High-Limit Switch Cover
50 Fusible Link Assembly
108 Button Plug, 2" (With hole for gas line)
OPTIONALCOMPONENTS
51
Fusible Link Bracket
Non Combustible Base
125-400 10521701-05
52 Terminal Block
53 Ignition Control Assembly - LD
Pressure Relief Valve 3/4" NPT, 75 PSI
Touch Up Spray Paint, Light Beige
Flame Sense Rod, Retrofit
All
All
All
All
R0040400
X0021100
R0334300
R0334200
54
55
56
57
58
Ignition Control - LD
Harness Assembly (Not Shown)
Transformer (115V/220V-24V) (Not Shown)
Ignition Control Panel (Not Shown)
In-Line Fuse Assembly (Not Shown)
Igniter Condensate Shield, Retrofit - LD
Notes:
1. For altitudes 2,000 Ft above sea level, call factory for orifice size.
2. For altitudes 5,000 Ft above sea level, call factory for orifice size.
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Model LG & LD Pool and Spa Heater
Page 23
60
59
64
67
63
61
62
66
CANADA
UNITED STATES
65
UNITED STATES
CANADA
UNITED STATES
105
85
HEATEXCHANGER
SEE NEXT PAGE FOR DETAIL
82
104
TEMPERATURECONTR0L
SEE NEXT PAGE FOR DETAIL
108
82
85
51
102
50
106
52
9
103
53
107
54
101
10
BURNERTRAY
(LDSHOWN)
SEE NEXT PAGE
FORDETAIL
11
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WATERPIK TECHNOLOGIES INC.
Page 24
20
(LG
SHOWN)
92
39
38
89
22
91
32
31
86
94
23
88
93
90
24
87
30
42
76
77
78,81
79
84
41
45
80
44
47
69
36
48
49
40
85
25
(LD
SHOWN)
27
43
29
28
35
68
95
96
33
70
98
34
75
97
26
69
74
72
73
74
72
71
75
2
73
1
6
4
18
16
3
5
14
8
13
15
7
12
(LG
SHOWN)
19
17
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Model LG & LD Pool and Spa Heater
Page 25
NOTES
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LIMITED WARRANTY
Thank you for purchasing Jandy® pool and spa products. Waterpik Technologies (manufacturer of Jandy
products, including Laars® pool and spa heaters) warrants all parts to be free from manufacturing defects in
materials and workmanship for a period of one year from the date of retail purchase, with the following
exceptions:
AquaLink® RS units installed with Jandy Surge Protection Kits will be covered for two years.
•
NeverLube® valves are warranted for the life of pool and/or spa on which they were originally installed.
•
This warranty is limited to the first retail purchaser, is not transferable, and does not apply to products that have
been moved from their original installation sites. The liability of Waterpik Technologies shall not exceed the repair
or replacement of defective parts and does not include any costs for labor to remove and reinstall the defective
part, transportation to or from the factory, and any other materials required to make the repair. This warranty does
not cover failures or malfunctions resulting from the following:
1. Failure to properly install, operate or maintain the product(s) in accordance with our published Installation,
Operation and Maintenance Manuals provided with the product(s).
2. The workmanship of any installer of the product(s).
3. Not maintaining a proper chemical balance in your pool and/or spa [pH level between 7.2 and 7.8, Total
Alkalinity (TA) between 80 to 120 ppm, Total Dissolved Solids (TDS) less than 2000].
4. Abuse, alteration, accident, fire, flood, lightning, rodents, insects, negligence or acts of God.
5. Scaling, freezing, or other conditions causing inadequate water circulation.
6. Operating the product(s) at water flow rates outside the published minimum and maximum specifications.
7. Use of non-factory authorized parts or accessories in conjunction with the product(s).
8. Chemical contamination of combustion air or improper use of sanitizing chemicals, such as introducing
sanitizing chemicals upstream of the heater and cleaner hose or through the skimmer.
9. Overheating, incorrect wire runs; improper electrical supply; collateral damage caused by failure of O-Rings,
DE grids, or cartridge elements; or damage caused by running the pump with insufficient quantities of water.
LIMITATION OF LIABILITY:
This is the only warranty given by Waterpik Technologies. No one is authorized to make any other warranties on
Waterpik Technologies' behalf. THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED OR
IMPLIED, INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTIES OF FITNESS FOR A
PARTICULAR PURPOSE AND MERCHANTABILITY. WATERPIK TECHNOLOGIES EXPRESSLY DISCLAIMS
AND EXCLUDES ANY LIABILITY FOR CONSEQUENTIAL, INCIDENTAL, INDIRECT OR PUNITIVE
DAMAGES FOR BREACH OF ANY EXPRESSED OR IMPLIED WARRANTY. This warranty gives you specific
legal rights.You may also have other rights which vary by state or province.
WARRANTY CLAIMS:
For prompt warranty consideration, contact your dealer and provide the following information: proof of purchase,
model number, serial number and date of installation. The installer will contact the factory for instructions
regarding the claim and to determine the location of the nearest designated service center. If the dealer is not
available, you can locate a service center in your area by visiting www.jandy.com or by calling our technical
support department at (707) 776-8200 extension 260. All returned parts must have a Returned Material
Authorization number to be evaluated under the terms of this warranty.
A Waterpik Technologies Company
6000 Condor Drive • Moorpark, CA USA 93021 • 707.776.8200 • Fax 707.763.7785
480 S. Service Road West • Oakville, Ontario, Canada L6K 2H4 • 905.844.8233 • Fax 905.844.2635
Litho in USA ©Waterpik Technologies 0406
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