FOR YOUR SAFETY - This product must be installed and serviced by a professional service technician, qualified in pool heater installation. Improper installation 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.
H0235900-
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.
4A.General Information .................................. 21
4B.Parts List ................................................... 21
Model LG & LD Pool and Spa Heater
Page 1
SECTION 1.
General Information
1A. Introduction
This manual provides installation and operation
instructions for the Laars Lite 2, Model LG and LD
pool and spa heaters. Read these installation and
operation instructions completely before proceeding
with the installation. Consult the Waterpik Laars
factory, or local factory representative, with any
questions regarding this equipment. Experience has
shown that most operating problems are caused by
improper installation.
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
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.
VentU.S. Outdoor
DiameterDim "H"
CAN Outdoor(1,000's)
Shelter Dim "H"
Figure 1. General Configuration.
Page 2
WATERPIK TECHNOLOGIES INC.
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.
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.
1C. Warranty
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 coverage.
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.
1D. Technical Assistance
Consult Waterpik Laars or your local distributor
with any questions or problems involving the specifications, installation, and operation of your Waterpik
Laars equipment. An experienced technical support
staff is ready to assist in assuring the proper performance and application of Waterpik Laars products.
For technical support call (415) 382-8220 extension
260.
SECTION 2.
Installation Instructions
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 improper installation may void the warranty. If field
conditions require change to any of the above, consult
the factory.
All gas-fired products require correct installation
to assure safe operation. The requirements for pool
heaters include the following:
1. Field assembly (if required)
2. Appropriate site location (clearances) and
flooring
3. Sufficient combustion and ventilation air
4. Properly sized gas meter and piping
5. Proper electrical wiring (if required)
6. Adequate water flow
This manual provides the information needed to
meet these requirements. Review all application and
installation procedures completely before continuing
the installation.
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.
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 instructions 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 atmospheric pressure zone as the combustion air inlet to the
heater.
Model LG & LD Pool and Spa Heater
g
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.
Page 3
Figure 2. Indoor Installation Venting (USA), or Outdoor Shelter (Canada).
Table 1. Air Openings to Outside.
Required Net Free Open Area
for Combustion Air Openings
Note: If using screens and/or louvers, compensate by adding 50%
additional area to each opening.
2
(cm2)in2(cm2)
2C. Site Location
Improper installation or maintenance can
cause nausea or asphyxiation from carbon
monoxide in flue gases which could result in
2C-1. Installation Information
Avoid placing the heater in locations where it can
cause damage by water or condensate leakage. If this is
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 termination. The vent pipe must have a listed vent cap which
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.
allows a full equivalent opening for flue products (see
Figure 2).
Table 2. Minimum Heater Clearances From Combustible Surfaces
Blank615.2615.2632615.2
Rear615.2615.2632615.2
Pipin
Top44111.744111.7Open Unroofed Area
Front1845.73691.41845.73691.4
inchcminchcminchcminchcm
1230.51845.71230.51845.7
( )
()
()
()
()
()
()
()
()
()
()
()
( )
()
()
()
()
( )
()
()
()
()
Page 4
WATERPIK TECHNOLOGIES INC.
2C-2. Outdoor Installation
Laars Lite 2 heaters can be installed in the lowprofile, 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.
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).
feet (0.91 m) from vertical surfaces (e.g., nearby
buildings and walls). The addition of a vent cap may
be necessary.
2C-3. Flooring - Typical Installation
Do not install the heater directly on a combus-
tible wood or carpet floor without placing a noncombustible 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])
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.
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 (0.30m). The
area under the overhang must be open on three sides.
This prevents combustion gases from being diverted
into living areas through doors, windows, or gravity
inlets.
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
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 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.
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
Model LG & LD Pool and Spa Heater
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.
2D. Combustion and Ventilation Air
Supply
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.
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.
2E. Gas Supply and Piping
2E-1. General Instructions
Review the following general instructions before
continuing the installation.
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.
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.
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:
Page 5
Manual Shutoff
Valve
Gas Supply
Inlet
T-Fitting
3" Min.
(76 mm)
Cap
Figure 5. The proper design for a sediment trap / drip
leg.
Nipple
Union
To
Equipment
Inlet
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.
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.
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.
Page 6
WATERPIK TECHNOLOGIES INC.
Table 4. Gas Supply Pressure Requirements
Supply PressureNatural GasPropane Gas
Water Columnin.(mm)in.(mm)
5.Install a sediment trap (drip leg) ahead of the gas
controls (see Figure 5). Fit the trap with a
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.
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.
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.
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.
2F. Electrical Wiring
Caution
Label all wires prior to disconnection when
servicing controls. Wiring errors can cause
improper and dangerous operation.
Verify proper operation after servicing.
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.
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.
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.
To wire the Laars Lite 2 model LD heater to a
120V or 240V /60 Hertz (Hz) electrical source:
1.Remove the screw located to the lower right side
of the transformer and open the hinged cover of
the wiring enclosure.
Caution
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
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.
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 configure the transformer for the correct input voltage.
3.Attach the ground wire to the green ground screw
located on the back panel of the wiring enclosure.
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.
Model LG & LD Pool and Spa Heater
MODEL LD WIRING DIAGRAM
OFF
SPA
POOL
REMOTE
CONNECTOR
BK
WWWW
WATER
TEMP
SENSOR
PRES SURE
SWITCH
Y/BK
HONEYWELL
GAS VALVE
MV1
MV2
Y
a) Connection Diagram
L1
LIMIT
HSI IGNITION WIRE
FACTORY WIRED - 120 V/240 V
FIELD WIRED - 120V /240V
FACTORY WIRED - 24 V
LIMIT
BR
Y
FIREM AN
SWITCH
CONNECTION
W
W
W
W
IF ORIGIN AL WIRE SU PP L I ED W ITH HE ATE R
MUST BE REPLACED, APPLIANCE W IRING
MATERIAL RATED AT 105 C SH ALL B E USE D.
WIRIN G SH OWN A S S HALL U SE
APPLIANCE W IRING MATERIAL RATED AT 200 C.
FUSIBLE
LINK
FLAME SE N SE R O D
IGN /120
IGN /240
(LI)
(L2)
IGN
FS
TH
VALVE
GND
IGN ITE R
ELEC.
FUSE
NOTE:
TRANSFORMER
120-240 V
R
G/Y
Y
WIRE TO IGN /1 2 0
FOR 120 VOLTS
WIRE TO IGN /2 4 0
FOR 240 VOLTS
BK
W/R
W/BK
R
IGNITION CONTROL
(FE NWA L )
0533
TRANSFO RMER
120-240V / 24 V
(L1)
(L2)
ONLY 120 V
240V CONNECTION
SHOWN
60 HZ
O
G
G
BK
R
ALTERNATE 120 V WIRING
BK
W/R
W/BK
R
BK
L2
G
R
BK
240V
60 H z
SINGLE
R
PHASE
ATT ACH
GROUND
WIRE
HERE
BK
R
AT TACH
GROUND
WIRE
HERE
Page 7
O
TH
PRESSURE
SW ITCH
BK
BK/Y
W
FS
W
O
150 F
HI-LIMIT
SWITCH
SPA SET POINT
VA LVE
BR
O
135 F
HI-LIMIT
SWITCH
FIREMAN
SW ITCH
CONNECTOR
POOL SET POINT
OFF
CIRCUIT
SEN
WATER TEMPERATURE
SENSO R
L2IGN
H/W G AS VALVE
MV1MV2
FUSIBLE
LINK
SEN
L1IGN 120
W
Y
R
ELECTR ICAL
FUSE
1-25 AM P
W
or
IGN 2 4 0
IGN IT O R
FLAME SENSO R
TRANSFO RMER
24 V
GND
Y
GND
W
IGN IT IO N
CONTROL
Black
BK -
White
W-
Brown
BR -
Yello w
Y-
Red
R-
Orange
O-
Yellow & Black
Y/BK -
Wh ite & Black
W/BK -
White & Red
W/R -
Green & Yellow
G/Y -
b) Schematic Diagram
Figure 6. LD Connection/Schematic Wiring Diagram.
H0236300-
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