Laars Lite 2 LC User manual

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.
H0216300B
Installation and Operation Data
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 service technician.
Installation and
Operation Manual
Laars Lite 2™
Model LC (Australia)
Pool and Spa Heater
Natural Gas
Propane (Outdoor Only) Outdoor
Configuration

TABLE OF CONTENTS
SECTION 1.
General Information
1A. Introduction................................................... 1
1B. Description ................................................... 1
1C. Warranty....................................................... 1
SECTION 2.
Installation Instructions
2A. General Information ..................................... 1
2B. Outdoor Installation ..................................... 2
2B-1. Heater Clearance ......................................... 2
2C. Indoor Installation ......................................... 3
2C-1. Heater Clearance ......................................... 3
2C-2. Combustion and Ventilation Air Supply ........ 4
2D. Gas Supply and Piping ................................. 4
2E. Electric Wiring .............................................. 4
2E-1. Auxiliary Time Clock Wiring ......................... 4
2E-2. Remote Operation ........................................ 5
2F. Water Piping ................................................ 5
2G. Pressure Relief Valve ................................... 6
2H. Pressure Switch............................................ 6
2J. Pressure Switch Adjustment......................... 6
2K. Automatic Chlorinators ................................. 6
2L. Temperature Rise......................................... 7
SECTION 3.
Operating Instructions
3A. Start-Up Procedure ...................................... 8
3B. Temperature Controls .................................. 8
3C. Lighting and Shutdown ................................. 9
3C-1. Lighting the Heater ....................................... 9
3C-2. Filter Pump Operation .................................. 9
3C-3. Shutdown...................................................... 9
3D. Spring and Autumn Operation ...................... 9
3E. Winterizing ................................................. 10
3F. Water Chemistry ........................................ 10
3F-1. For Pool ...................................................... 10
3F-2. For Spa....................................................... 10
3F-2a. Corrosion .................................................... 10
3F-2b. Testing........................................................ 10
3G. Therapeutic Spa Safety Rules.................... 11
3H. Swimming Pool Energy Saving Tips .......... 11
3J. Periodic Inspection ..................................... 12
SECTION 4.
Maintenance
4A. General ..................................................... 12
4B. Gas Pressure Tests................................... 12
4C. Electrical Troubleshooting......................... 13
4C-1. Control System Troubleshooting Sequence ... 13
4D. Gas Valve Replacement ........................... 20
4E. Gas Burner Removal ................................ 20
4E-1. Pilot Burner Removal................................ 21
4F. Heat Exchanger Water Passages Inspection . 21
4G. Cleaning the Heat Exchanger ................... 22
4H. Automatic Flow Control Valve .................. 22
SECTION 5.
Assembly Instructions
5A. Reversible Water Connections ................. 23
SECTION 6.
LLC (Australia) Parts List
Exploded View of Heater...........................26
Parts List and Numbers.............................27
6A. Capacities and Dimensions....................... 28

Model LC (Australia) Pool and Spa Heater Page 1
SECTION 1.
General Information
1A. Introduction
This manual provides information for the proper
installation, operation and maintenance of the Laars
Lite 2 Model LC (Australia) pool heater. The heater is
approved by the Australian Gas Association for use
with natural and propane gases. Installation should be
carried out in accordance with these instructions, the
gas authority and local government regulations.
The Installation, Operation, and Maintenance
manual must be followed exactly.
1B. Description
The Model LC (Australia) gets electrical power
from an external 240 volt (V) source. The Model LC
(Australia) provides a dual thermostat Flex-Temp
control system for pool/spa combinations or preheat
convenience. All Laars Lite 2 Model LC (Australia)
heaters meet stringent energy requirements such as
those instituted by the United States which require
intermittentignition devices.
Waterpik Technologies designed this appliance to
heat only fresh water swimming pools and spas. Do
not use it as a heating boiler or general service water
heater. For special applications, consult your Austra-
lian Waterpik Technologies dealer.
Waterpik Technologies ships the heater with the
water connections on the right side. It could be neces-
sary, or helpful, to switch the connections to the left
side to improve access for service. Instructions for
making this change can be found in Section 5. The
procedure should only be done by authorized person-
nel.
1C. Warranty
Waterpik Technologies sells the Laars Lite 2
Model LC (Australia) heater with a limited factory
warranty. A copy of the warranty is on the back cover
of this manual and is included in the plastic bag.
The home owner should fill out the warranty
registration card included in the plastic bag and return
it to the Australian distributor.
The warranty does not cover damage caused by
improper installation or field modification, or to the
heat exchanger by corrosive water. Section 3F explains
proper pool water chemistry.
SECTION 2.
Installation Instructions
WARNING
Improper installation or maintenance can
cause nausea or asphyxiation from carbon
monoxide and flue gases which could result in
severe injury or death.
2A. General
All gas-fired products require correct installation to
assure safe operation. The requirements for pool
heaters include the following:
1. Appropriate site location (clearances).
2. Noncombustiblesurface.
3. Sufficient combustion air and ventilation air.
4. Adequate venting (products of combustion).
5. Properly sized gas pipe.
6. Adequate water flow.
Install the heater at least 1.5 meters (m) from the
inside wall of the pool or spa unless it is separated
from the pool or spa by a solid fence, wall, or other
permanent barrier.
The Gas Installation Code AG601 offers general
guidelines for combustion air, ventilation air, and
flueing. Follow these guidelines to make sure the
installation is safe and efficient.
Pick a heater location that will supply enough air
for proper flue clearance, and allow space for mainte-
nance access. Recommended clearances are specified
in Section 2B and 2C.
Locate the heater in an area where condensate
leakage from the heater or connections will not damage
the area around the appliance or the structure. If such a
location cannot be avoided, install a suitable drain pan
under the heater. This pan must not restrict air flow.
Install the heater on a noncombustible surface.
That means a surface made up of steel, iron, brick, tile,
concrete, slate, glass or plaster.
You can install the heater on a combustible floor
by putting a noncombustible base under the heater. Do
not install heater on carpeting. Combustible floor is a
floor made of, or surfaced with wood, compressed
paper, plant fibres or other materials that will ignite
and burn.
It is recommended that the noncombustible base
be a platform under the heater constructed of hollow
masonry no less than 100 millimeters (mm) thick,
covered with sheet metal at least 0.75 mm thick. The
masonry must be laid with ends unsealed, and joints
matched to provide a free circulation of air from side
to side through the masonry (see Fig. 1).

Page 2
Safe operation at the proper gas manifold pres-
sure requires correct sizing of supply gas pipe. The
Gas Installation Code AG601 also offers general
criteria for gas piping (see Section 2D).
If the above installation requirements are not
followed, the fuel used in these appliances could
produce and expose you to substances that are known
to cause cancer or reproductive harm.
Install the heater in accordance with all local
codes and ordinances and the most recent edition of the
Gas Installation Code AG601.
Do not operate this heater outdoors at tempera-
ture below -7°C.
WARNING
The heater must be tested to ensure
operation is satisfactory before the installer
leaves.
2B. Outdoor Installation
2B-1. Heater Clearance
Locate the heater in an open, unroofed area, (see
Fig. 2) and maintain the following clearances:
Blank side and 150 mm Minimum
rear of heater
Piping side 300 mm Minimum
Front of heater 450 mm Minimum
Floor Noncombustible*
*If you are installing the heater on a combustible
surface, use an approved noncombustible base.
Do not install the heater in a location where
leaves or other combustible materials can gather
around the base or on the top.
Do not locate the heater close to sprinklers; the
water could damage the controls and the electronics.
If you are installing the heater under an overhang,
there must be a minimum clearance of 1.5 meters
above the top of the heater. The area under the over-
hang must be open on three sides. Protect the heater
from direct water drainage.
WARNING
Minimum clearances between the heater and
any opening into the building must be
maintained.
IMPORTANT: High wind conditions may
cause downdrafting problems in the heater. To mini-
mize downdrafting problems in high wind areas, locate
the heater at least 900 mm from vertical surfaces, such
as nearby buildings and walls.
Special Precautions for Propane Gas Heaters
Propane gas is heavier than air, so do not
install pool heater using propane gas in pits or other
locations where gas might collect. Locate the heater a
safe distance from propane gas storage and filling
equipment. Consult local codes and fire protection
authorities about specific installation restrictions.
Figure 1. Non-Combustible Platform
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 2. Outdoor Heater Locations
Size 125-500 mm
All Other Sizes - 1500 mm

Model LC (Australia) Pool and Spa Heater Page 3
2C. Indoor Installation
The Laars Lite 2 Model LC (Australia) heater is
design-certified for indoor installation only when
equipped with a draft hood. Check the rating plate or
the parts list (Section 6) for the correct Laars draft
hood part numbers. Install the draft hood without
modification.
Connect the draft hood to a vent pipe which stops
at least 0.6 m above the highest point of the roof or
other object that is within 3 m of the flue. Install a
listed cap which allows a full equivalent opening for
flue products (see Fig. 3).
2C-1. Heater Clearance
Top of Heater 1.1 m Minimum
Blank side and 150 mm Minimum
rear of heater
Piping side 300 mm Minimum
Front of heater 450 mm Minimum
Floor Noncombustible*
*If you are installing the heater on a combustible
surface, an approved noncombustible base must be
installed.
305 mm of 305 mm of
Figure 3. Indoor Installation Venting and Flueing
NOTE:
1. The draft hood must sit directly on top of the heater as shown and must not be altered in any manner.
2. An approved flue cowl must be fitted.
3. Use approved roof fitting.
Table 1. Direct Air Openings
Required Net Free Opening Area (cm2)
Directly from Outside
Model At Top At Bottom
125 393 393
175 552 552
250 789 789
325 1023 1023
400 1260 1260
Table 2. Ducted Air Openings
Required Net Free Opening Area (cm2)
Ducted from Outside
Model At Top At Bottom
125 786 786
175 1104 1104
250 1578 1578
325 2046 2046
400 2520 2520
0.75 0.75
Roof jack Roof jack
300 mm
Piping side
150 mm
Blank side
& Rear
300 mm
Piping side
150 mm
Blank side
& Rear

Page 4
Figure 4. Proper Design For Sediment Trap / Drip Leg
2C-2. Combustion and Ventilation Air
Supply
All indoor installations must have openings to
outside air for combustion and ventilation. Tables 1
and 2 (see Fig. 3) show the net free opening areas
required at both ceiling and floor for the different
heater sizes. Waterpik Technologies does not recom-
mend indoor installations that do not provide combus-
tion air from outside the building.
NOTE: Check with louver manufacturers for Net
Free Area of louvers. Correct for screen resistance to
the Net Free Area if a screen is installed. Check all
local codes applicable to combustion air.
If the heater is installed in a residential garage,
the burners must be 450 mm above the garage floor.
See the Gas Installation Code AG601 for more infor-
mation.
Warning
The conversion of this appliance from natural
gas to propane gas, or propane to natural,
must be done by an authorized person.
Waterpik Technologies provides kits and
detailed instructions for converting the heater.
2D. Gas Supply and Piping
Heaters shipped from the factory are certified to
operate at an altitude of zero to 600 m for natural gas,
to 1500 m for propane gas. The heater rating plate is
marked for use at specific altitudes.
If the supply gas pressure is less than required,
check for undersized pipe between the meter and the
heater, a restrictive fitting, or an undersized gas meter.
Waterpik Technologies recommends the gas inlet
pipe sizes in Table 3. Check local codes for compli-
ance before installing the heater.
Table 3. Recommended Gas Inlet Pipe Sizes
Heater Distance from the meter
Size 0 to 15 m 16 to 30 m 31 to 60 m
125 20 mm 25 mm 32 mm
175 25 mm 32 mm 32 mm
250 & 325 32 mm 32 mm 40 mm
400 32 mm 40 mm 50 mm
Install a union on the gas supply line outside the
heater jacket, including a drip leg and a manual shut-
off valve (see Fig. 4). Do not use a restrictive gas cock.
Before operating the heater, test all gas connec-
tions for leaks with a soap solution. Do not use an
open flame. Disconnect the heater and its individual
shut-off valve from the gas piping during pressure
NOTE: For propane gas, use one size smaller pipe except
on Model 125 which requires 20 mm from 0 to 15 m.
Manual Shutoff
Valve
Gas Supply
Inlet
To
Equipment
Inlet
Union
Cap
T-Fitting
75 mm Min. Nipple
testing if the test pressure is higher than 1/2 psig (3.7
kPa). If the test pressure is equal to or less than 1/2
psig (3.7 kPa), close the manual shut-off valve on the
heater during the piping pressure test.
If the supply gas pressure (Table 4) is less than
required, check for undersized pipe between the meter
and the heater, a restrictive fitting, or an undersized
gas meter.
Table 4. Supply Gas Pressure
Minimum Maximum
Natural Gas 1.13 kPa 2.5 kPa
Propane Gas 2.50 kPa 3.5 kPa
NOTE: The minimum value listed for input adjustment.
Do not exceed the maximum supply pressure.
2E. Electric Wiring
The unit is fitted with a flexible electric cord and
3-pin plug for connection to a 240V 10 ampere (A)
power outlet. The power outlet must be effectively
earthed. See Figure 5 for the Model LC (Australia)
heater wiring.
NOTE: The pool heating system must have a manual
reset high limit installed in accordance with AS2610,
Section 2.7 (see Fig. 9). Contact a local installer or
distributor.
NOTE: No external junction box is required.
2E-1. Auxiliary Time Clock Wiring
If you install a time clock to control the filter
pump operation, the clock should have its own low
voltage (Fireman's) switch that turns off the heater
before turning off the pump. The switch should shut
off the heater about 15 minutes before the filter pump
shuts off.

Model LC (Australia) Pool and Spa Heater Page 5
To install a time clock switch into the heater
wiring, follow these steps (see Fig. 6):
1. Remove the heater door.
2. Remove the factory-installed wire between
terminals 1 and 2 on the terminal block (see Fig. 7).
3. Connect the wires from the time clock auxil-
iary switch to the two terminals. Use 14 gauge copper
wire with insulation at least 1.2 mm thick, and tem-
perature rating of 221°F (105°C) or greater.
2E-2. Remote Operation
The Model LC (Australia) pool/spa heater
controls can be wired for remote operation. Two
Waterpik Technologies remote control models are
available through the local dealer or distributor. The
CS-07 remote control permits switching from one
temperature controller to the other and turning the
heater on and off from a remote location. The CS-08
includes the same features as the CS-07 plus a remote
temperaturecontroller.
An interrupt (On-Off) type remote can be con-
nected by removing the jumper wire on the terminal
block located in the control compartment (see Fig. 7)
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 Flex-Temp control panel.
To connect a 3-wire remote (not supplied by
Waterpik Technologies), order a wire harness assem-
bly (part No. E0120000) which connects to the Flex-
Temp control panel. Installation instructions are
included with the wire harness assembly.
2F. Water Piping
The heater has 50 mm universal header
couplings. You can connect threaded 50 mm iron or
copper pipe, unthreaded 38 mm iron or copper pipe
using the special gaskets packaged with these
instructions, and CPVC pipe by first fitting the
CPVC nipples provided with the heater into the coupling
(see Fig. 8).
You can connect high-temperature plastic piping
(CPVC Schedule 80) to the inlet/outlet header if local
codes allow it, and the controls keep the filter pump
running at least 15 minutes after the heater is turned off.
NOTE: Do not use PVC plastic materials in pipes,
fittings, grids and other elements of the filter system
unless a metal "heat sink" pipe is used between the
filter and the heater (see Fig. 9).
NOTE: The pool heating system must have a
manual reset high limit installed in accordance with
AS2610, Section 2.7 (see Fig. 9). Contact a local
installer or distributor.
Figure 5. LC Wiring Diagram
Figure 7. Fireman's Switch Connection
Figure 6. Time Clock Wiring
Suggested Time Clocks: Intermatic or Paragon
Terminal 1
Terminal 2

Page 6
Install a check valve if there is any chance of
"back-siphoning" when the pump stops. Do not install
any other valve or variable restriction in the piping
between the heater outlet and the pool, unless it is
being used as a diverter valve.
2G. Pressure Relief Valve
A pressure relief valve is not supplied with the
heater, but local plumbing codes may require it. To
install a pressure relief valve, replace the 3/4" brass
plug on top of the input/output header with the valve
(see Fig. 10). The valve setting should be at or below
the maximum working pressure of any component in
the filter system
2H. Pressure Switch
The pressure switch is preset at the factory for
normal pool installations. Do not adjust the pressure
switch unless any of the following conditions exist:
1. If the top of the heater is 900 mm or more below
the surface of the pool.
2. If any part of the filter system piping is 900 mm
or more above the top of the heater jacket.
If either of these conditions exist, follow the
instructions in Section 2J.
NOTE: Do not make the pressure switch adjustment if
the heater is installed more than 4.6 m below or 1.8 m
above the pool surface. Consult Waterpik Technolo-
giesforrecommendations.
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.
2J. Pressure Switch Adjustment
The pool filter must be clean before making this
adjustment. The heater does not have to be firing.
1. Turn the rotary switch to OFF, and make sure the
pressure switch is at its lowest setting. This is
done by rotating the adjuster counter clockwise as
far as it will go (see Fig. 11).
2. Start the filter pump and confirm by means of
hearing an audible click or with an ohmmeter that
the pressure switch closes. If the switch fails to
close, replace it with a switch that has a lower
minimumsetting.
3. Turn the adjuster clockwise to open the contacts
(see Fig. 11).
4. With the pump still running, reduce the pressure
setting 7 to 14 kPa psi to reclose the contact.
5. Turn off the pump and make sure the pressure
switch contacts open. The contact must open
right away when the pump shuts off.
It may be necessary to repeat these steps to get a
proper setting. The switch must be set so that the
heater will not fire unless the pump is running. If a
proper setting cannot be reached, contact the factory
servicedepartment.
Elevated spas are a special problem if the water
surface is more than 2.4 m above the heater, because
the pressure switch has a limit of 35 kPa. A special
pressure switch is available from the factory for these
installation.
When the water surface is more than a few feet
below the heater, use a pressure switch with a mini-
mum setting of 7 kPa.
2K. Automatic Chlorinators
(Chemical Feeders)
A high concentration of chlorine (or other chemi-
cal) in the pool heater can be very destructive. Heater
damage caused by chemical concentration is not
covered by the Waterpik Technologies warranty. See
Section 3F for recommended levels.
Figure 8. Piping Connections

Model LC (Australia) Pool and Spa Heater Page 7
Figure 9. Typical Installation
IMPORTANT: Equip the chlorinator with an
antisiphoning device so that chlorine will not siphon
into the heater after the pump shuts off.
Wire the chlorinator so it cannot operate unless
the filter pump is running. If the chlorinator has an
independent clock control, be sure the filter and
chlorinator clocks are synchronized.
If the chlorinator is equipped with its own pump,
install it so that it introduces the chlorine downstream
from the heater, and, if possible, below the level of the
heater outlet fitting.
2L. Temperature Rise
When the installation is complete, the installer
should take a temperature rise. Use the figures in Table
5 to confirm proper water flow through the heater.
An automatic, built-in bypass valve maintains
proper flow through the heater at flow rates up to 475
liters per minute (L/min). If the system filter-flow rate
is higher than 475 L/min, install a manual bypass
valve. Figure 9 shows a valve installed between the
Figure 10. Thermometer and Pressure Relief Valve
heater inlet and outlet. To set the bypass valve, follow
this procedure.
1. Clean the pool filter if necessary.
2. With the filter pump off, remove the drain valve
located on the right side of the inlet/outlet header.
Install a 1/4 inch Pete's plug and thermometer
(see Fig. 10).
3. Close the manual bypass valve.
4. Turn off the heater by moving the rotary switch
to OFF.
5. Start the filter pump.
6. After 3 minutes, note and record the thermometer
reading (this is pool water temperature).
7. Follow the procedures on the Lighting and
Shutdown label located inside the control com-
partment to turn the heater on.
8. Let the heater run for at least five minutes before
noting and recording the new thermometer
reading. The difference between this reading and
the first one is the temperature rise.
Figure 11. Pressure Switch Adjustment

Page 8
WARNING
PROPANE GAS: To avoid possible injury, fire
and explosion, read and follow these
precautions and all instructions on this
appliance before lighting the pilot. If this
appliance uses Propane gas which is heavier
than air, it will remain at ground level if there is
a leak. Before lighting, sniff at ground level. If
you smell gas, follow these rules:
1. DO NOT light matches. DO NOT turn
electric lights or switches on or off in
area. DO NOT use an electric fan to
remove the gas from area.
2. Shut off gas at propane tank.
3. Telephone gas company and fire
department for instructions. Give your
name, address and phone number.
If your propane tank runs out of fuel, turn off
gas at the appliance. After the tank is refilled,
the appliance must be relit according to the
instructions located on the inside of the door.
DO NOT attempt repairs on the gas control or
appliance. Tampering is dangerous and voids
all warranties.
3B. Temperature Controls
The temperature controls on the Model LC
(Australia) are calibrated at the factory, and cover a
range from 21°C to 40°C. Always use an accurate pool
thermometer to verify the actual pool water tempera-
ture. Once the correct position for the control knob is
found, use the TEMP-LOK to keep it from going any
higher by putting the tab next to the knob, then tighten-
ing the screw.
The heater has dual temperature controls which
allows two different temperature settings selected by
the rotary switch in the middle of the panel. The owner
can set one control for normal use and the other for
standby, or one can be set for a pool and the other for
a spa. Positioning the rotary switch in the middle turns
off the heater (see Fig. 12).
IMPORTANT: The temperature controls cannot be
calibrated in the field. If the control is faulty, shut
down the heater and replace the control according to
the instructions in Section 4. DO NOT use the rotary
switch to completely shut down the heater. Shut down
the heater completely by removing the access door and
turning the main gas valve OFF.
3A. Start-Up Procedure
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. Make sure the filter is clean
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 thermostat. When that
happens, the heater will automatically shut off, but the
filter pump will keep running. Even though the heater
will be operating, the outlet piping will not feel hot to
the touch.
NOTE: Keep all objects off the top of the heater.
Blocking air flow could damage the heater and void the
warranty.
9. If the temperature rise is outside the MIN-MAX.
numbers in Table 5, gradually open the bypass
valve until there is an acceptable temperature
rise.
10. Be sure the thermometer reading stays the same
for at least 3 minutes.
11. Once the temperature rise is correct, wire the
bypass valve in place to prevent tampering.
Table 5. Temperature Rise and Minimum
Flow Rates
TEMPERATURE RISE,°C MIN. FLOW
SIZE MIN. MAX. L/MIN
125 15 20 76
175 19 24 76
250 19 24 95
325 16 21 114
400 17 22 114
SECTION 3.
Operating Instructions
LIGHTING AND SHUTDOWN INSTRUCTIONS ARE
ON THE LABEL ATTACHED INSIDE THE CONTROL
COMPARTMENT DOOR.
WARNING
Flue pipes, draft hoods and heater tops get
hot! These surfaces can cause serious burns,
so do not touch these surfaces while the
heater is in operation. Adding a flue cap
reduces the temperature on the top.

Model LC (Australia) Pool and Spa Heater Page 9
On propane heaters, if the pilot does not ignite
within 15 seconds, the system locks out and turns off
power to the whole system.
To check the lockout on the ignition control, turn
the gas valve knob OFF. Set the thermostat to call for
heat. Sparking occurs after a few seconds, but since
there is no supply gas, the pilot cannot light. Sparking
continues for about 15 seconds until lockout occurs
and the ignition control shuts down the system. To
reactivate the system, turn the thermostat to its lowest
setting, wait 10 seconds, then turn the thermostat to its
original setting.
1. Turn the gas valve knob to ON.
2. Replace the control compartment door.
3. Position the rotary switch to ON and follow
the lighting instructions above.
3C-2. Filter Pump Operation
The filter pump must continue running for at
least 15 minutes after the heater shuts off to prevent
damage to the system piping.
3C-3. Shutdown
For a complete shutdown, turn the switch on the
control panel to OFF, turn off all electrical power to
the heater at the main junction box, and set the thermo-
stat to its lowest setting. Open the control compartment
door and turn the gas valve knob clockwise to OFF.
Turn any external gas valves OFF.
3D. Spring and Autumn Operation
During periods of cold but not freezing weather,
turn the temperature control counterclockwise to the
MIN setting. This will prevent damage, yet still permit
bringing the pool water back up to the desired tempera-
ture in the least amount of time.
In areas subject to only short freeze periods, turn
off the heater and run the filter pump continuously for
the length of the cold period.
If the pool is not going to be heated for a long
period, shut the heater off (see Section 3C-3).
3C. Lighting and Shutdown
3C-1. Lighting the Heater
Full lighting and shutdown instructions can also
be found attached to the inside of the control compart-
ment door.
To restart the heater in the Spring, have a profes-
sional service technician reassemble the heater as
follows:
WARNING
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.
Turn off all electrical power to the heater at the
main junction box. Open the control compartment door
and turn the gas valve OFF. Turn the rotary switch on
the temperature control panel OFF. WAIT FIVE
MINUTES BEFORE TRYING TO LIGHT THE
HEATER.
The LC (Australia) heater does not need manual
pilot lighting. It is done automatically by the ignition
control when the thermostat calls for heat.
1. Turn the gas valve control knob counter-
clockwise to ON (Fig. 13).
2. Replace the control compartment door.
3. Turn on electrical power to the heater.
4. Turn on the filter pump.
5. Set the appropriate temperature control to the
desired setting, and turn the rotary switch to
that control. Until the water reaches a tempera-
ture of about 21°C, it is normal to have some
water accumulating in the base of the heater.
6. Set the time clock if one is installed.
Figure 12. LC (Australia) Temperature Controls
Figure 13. LC (Australia) Gas Valve
C

Page 10
3E. Winterizing
In areas where freezing temperatures occur, and
you don't plan to use the pool or spa, have your service
technician perform the following steps:
1. Shut off the gas valve and external supply line
valves.
2. Completely drain the heater before the first
frost. To drain the heater, remove all the drain
plugs (see Fig. 14). After the heater is drained,
remove the valves. Make sure there is no
mineral buildup in the openings.
3. Use compressed air to blow out any standing
water in the heat exchanger.
4. Grease the threads in the header for winter
protection, but don't close them off.
5. Disconnect the copper tubing at the pressure
switch (see Fig. 15).
3F. Water Chemistry
3F-1. For Pool
The mineral content of swimming pool water
increases daily, due to natural evaporation and the
addition of sanitizing chemicals. If you let the mineral
content get too high, the excess minerals will deposit
on the walls of the pool, the filter system, and in the
heater tubes. That is why it is important to maintain
the pH factor of the pool water between 7.2 and 7.6.
3F-2. For Spa
The control of proper chemical balance in spa
water is more critical than in a swimming pool for
satisfactory heater operation. Usage density in a spa is
many times greater than a swimming pool. The spa
size, the higher water temperature, and the heavy
usage, mean chemical values in a spa can differ
greatly. The lack of the right chemical content can
result in unsatisfactory water conditions, and affect the
life of the heater.
Maintaining sanitary water conditions in a spa
can only be done by regular water changes and the
proper addition of sanitizing chemicals.
3F-2a. Corrosion
The corrosion action of spa water is increased by
thefollowing:
a. Low pH - acidity
b. Low total alkalinity - bicarbonates
c. Low calcium hardness - soft water
NOTE: Waterpik Technologies does not warrant heat
exchanger damages by corrosive water.
3F-2b. Testing
Waterpik Technologies recommends that owners
purchase a test kit and use it regularly. A minimum kit
will measure chlorine, alkalinity and the pH level.
The pool/spa owner should have a professional
service technician perform more extensive chemical
testing and water changing.
Figure 14. Heater Drain Locations
Figure 15. Pressure Switch Copper Tubing

Model LC (Australia) Pool and Spa Heater Page 11
Table 6. Chemical Levels
RECOMMENDED
TEST LEVEL
Free Chlorine 1.0 - 3.0 ppm
or
Bromine 2.0 - 4.0 ppm
pH 7.2 to 7.6
Total Alkalinity 100 to 150 ppm
(TA)
Calcium Hardness 200 to 400 ppm
(CH)
Langelier Saturation -0.5 to +0.5
Index (SI)
Cyanuric Acid 30 to 150 ppm
Total Dissolved 2000 ppm
Solid (TDS)
Copper 0 ppm
3G. Therapeutic Spa Safety Rules
The following safety rules, recommended by the
U.S. Consumer Product Safety Commission, should be
observed when using the spa:
1. Spa or hot tub water temperature should never
exceed 40°C. Thirty-eight (38)°C is considered
safe for a healthy adult. Special caution is
recommendedforyoung children.
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.
3. Pregnant women beware! Soaking in water
above 39°C can cause fetal damage during the
first three months of pregnancy (which could
result in the birth of a brain-damaged or de-
formed child). If pregnant women are going to
use a spa or hot tub, they should make sure the
water temperature is below 38°C.
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 2.5°C.
5. Persons with a medical history of heart disease,
diabetes, circulatory or blood pressure problems
should consult their physician before using a hot
tub or spa.
6. Persons taking any medication which induces
drowsiness (e.g., tranquilizers, antihistamines, or
anticoagulants) should not use spas or hot tubs.
7. Prolonged immersion in hot water can induce
hyperthermia.
Hyperthermia occurs when the internal body
temperature reaches a level several degrees above the
normal body temperature of 37°C. Symptoms include
dizziness, fainting, drowsiness, lethargy, and an
increase in the internal body temperature. The effects
ofhyperthermia include:
• Lack of awareness of impending hazard
• Failure to perceive heat
• Failure to recognize need to leave spa
• Physical inability to leave spa
• Fetal damage in pregnant women
• Unconsciousness resulting in a danger of drown-
ing
3H. Swimming Pool Energy Saving Tips
Waterpik Technologies offers the following
recommendations to help conserve fuel and minimize
the cost of operating your pool heater without sacri-
ficing comfort.
1. The most healthful swimming temperature is
25°C. Always use an accurate pool thermometer.
A difference of 3 °C degrees, from 25 to 28°C,
will use as much as 40% more gas.
2. Find the proper setting on the pool heater tem-
perature control and use the TEMP-LOK to
discourage further adjustments.
3. 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
stops.
4. 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
25°C level a day or so before you plan to use the
pool.
5. During the winter or when on vacation for longer
than a week, follow the instructions in Section
3C to shut down the heater.
6. Where possible, shelter the pool from prevailing
winds with well-trimmed hedges or other land-
scaping, cabanas, or fencing.

Page 12
SECTION 4.
Maintenance
IMPORTANT: An authorized service technician can
use the material in this section for testing and repairing
the LC (Australia) heater. It includes step-by-step
procedures for troubleshooting the electrical control
system and other parts of the heater. Review these
procedures before starting repairs.
4A. General
Other components in the pool system, like the
pumps, filters and strainers, valves, gas supply, and
time clocks, effect heater operation. Before starting the
heater-related troubleshooting procedures, make sure
the pump is operating properly, the filters and strainers
are not clogged, there are no closed valves in the piping
system, and the time clocks are adjusted. If all of these
components check out, then proceed with the following
troubleshootingprocedures.
4B. Gas Pressure Tests
Use the procedure described in Figure 17 to
check the supply and manifold gas pressures. A
manometer is available from Waterpik Technologies,
and instruction for its use are included in the kit.
7. 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.
3J. 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.
Waterpik Technologies designs and constructs the
Laars Lite 2 (Australia) heater to provide long per-
formance life when installed and operated properly
under normal conditions. Have regular inspections by
authorized personnel at least annually to keep the
heater operating efficiently. The authorized person
should check the following:
1. Keep the top and surrounding area of the heater
clear of all debris, and make sure there is no
collecting of flammable materials, leaves, paper,
etc. beneath the heater.
2. Inspect the internal surfaces of the heat exchanger
tubes annually, and remove any scale (see Section
4G).
3. Inspect the outside surfaces of the heat exchanger
tubes for soot accumulation by placing a mirror
between and under the burners when the heater is
firing. If there is soot on the tubes, remove it and
correct the cause.
4. Check for spider webs and other debris in the
pilot and main burner orifices - especially at
spring start-up.
5. Use a mirror to make a random visual check of
the main burner flame pattern. It should look like
Figure 16.
6. Inspect the gas and electronic controls annually
to assure safe and dependable operation. Specifi-
cally, check the following:
a. High temperature limit switch
b. Water pressure switch
c. Automatic gas valve
d. Temperature control
Electrical controls can deteriorate over a period
of years. A regular inspection schedule, with repair and
replacement as needed, will keep the heater controls
performingproperly.
7. Keep the pool heater area clean, and free of all
combustible materials, gasoline and other liquids
and vapors.
8. Do not use the heater if any part has been under
water. Immediately call an authorized person to
inspect the heater and replace any part of the
control system and any gas control which has
been under water.
Keep this manual in a safe place for future
reference by you and your authorized service techni-
cian when inspecting or servicing the heater.
Figure 16. Flame Patterns

Model LC (Australia) Pool and Spa Heater Page 13
4C. Electrical Troubleshooting
An authorized service technician, qualified in
pool heater maintenance, should do all troubleshooting
and repairing on the LC (Australia) heater. Before
calling a service technician, the heater owner can check
thefollowing:
1. Be sure the system pump is operating and the
filter is clean.
2. The heater circuit breaker and/or disconnect
switch must be ON, and the switch on the heater
control panel must be pointing at one of the tempera-
ture control knobs.
Figure 17. Gas Pressure Test Procedures
TESTING MAIN LINE GAS PRESSURE
1. Attach the manometer* to the heater jacket.
2. Open both columns on the manometer.
3. Use the shut-off valve outside the heater jacket to shut off
all gas supply to the heater.
4. Remove the cap screw from the gas fitting on the INPUT side
of the gas valve.
5. Attach one end of the manometer hose to the fitting on the
gas valve and the other end to the manometer.
6. Open gas supply valve to the heater and set the thermostat
high enough to call for heat.
7. Move the rotary switch to POOL or SPA. This should activate
the main burners.
8. With the main burners firing, the manometer reading should
be between 1.13 and 1.75 kPa (natural gas) and between
2.5 and 2.75 kPa (propane gas).
9. Move the rotary switch to OFF and refer to Lighting and
Shutdown label to shut down the system.
10. Disconnect the manometer tubing from the gas valve and
replace screw on the gas fitting.
TESTING MANIFOLD GAS PRESSURE
1. Attach the manometer* to the heater jacket.
2. Open both columns on the manometer.
3. Use the shut-off valve outside the heater jacket to shut off
all gas supply to the heater.
4. Remove the cap screw from the gas fitting on the OUTPUT
side of the gas valve.
5. Attach one end of the manometer hose to the fitting on the gas
valve and the other end to the manometer.
6. Wait five minutes.
7. Open gas supply valve to the heater and set the thermostat
high enough to call for heat.
8. Move the rotary switch to POOL or SPA. This should activate
the main burners.
9. The manometer reading should be 1.0 kPa for natural gas
and 2.25 kPa for propane gas.
10. Move the rotary switch to OFF and refer to Lighting and
Shutdown label to shut down the system.
11. Disconnect the manometer tubing from the gas valve and
replace screw on the gas fitting.
*A dry gas pressure gauge may be used for either test.
3. All external manual gas valves must be open,
and the heater's gas valve must be in the ON position.
4C-1. Control System Troubleshooting
Sequence
A. Heater Does Not Come On
IMPORTANT: Disconnect power to the heater before
removing or replacing any component or wire connec-
tion. If the power is not disconnected, "jumpering" the
gas valve or accidental grounding of the wire harness
or component terminals to the heater frame or jacket
could cause the fuse to blow.

Page 14
Step One
Experience has shown that most complaints about
heaters not coming on have nothing to do with the
heater directly. Usually, something has reduced water
flow through the heater system to shut down the heater.
Any of the following could cause the heater to not
come on. Check these items first.
1. Be sure the heater has been properly installed
(see Section 2).
2. Make sure the filter is clean. Buildup on the filter
element can lower water pressure through the
heater, causing it to shut off.
3. Make sure the pump is working.
4. Verify the main drain and skimmer valves are
open.
5. Make sure the gas valve is ON and there is gas
pressure in the line.
6. Carefully inspect all electrical connections and
wiring. Finding a loose connection or a charred
wire can save a lot of time and money.
7. Verify that the electrical circuit serving the heater
is ON, and there is power to the heater.
8. Make sure the switch on the heater control panel
is pointing at one of the temperature controllers.
9. Verify that the temperature controller is set high
enough to call for heat.
If the pump is circulating water, and the rest of
these items check out, the trouble could be in the heater
control system. Go to the next step.
Step Two
NOTE: Keep the filter pump running.
Testing Transformer, Safety Fuses and Fusible
Link, Limit Switches, and Pressure Switch (An
Alternating Current (AC) voltmeter with a 50 volt
range is required).
a. Transformer
Clip one lead from the voltmeter to the connec-
tor located where the blue wire from the transformer
connects to 24V on the ignition control. It may be
helpful to install a double male connector between the
blue wire and the and the 24V tab on the ignition
control. This lead will stay connected to this terminal
Figure 18. Model LC (Australia) Pictorial Wiring Diagram

Model LC (Australia) Pool and Spa Heater Page 15
for all of these test. Disconnect the other blue wire
from the in-line fuse and touch the second voltmeter
lead to the blue wire terminal (see Fig. 19). The meter
should register 20 to 28 volts. If the voltage is less than
20V, the electrical circuit to the heater may be supply-
ing less than 240V. This could be due to high pump
load, air conditioners or other appliances on the circuit.
If the meter shows no voltage, replace the transformer.
NOTE: Reconnect the blue wire to the in-line fuse.
Make sure the safety fuse is good before testing the
fusible link. If it is not, check for shorts.
b. Fusible Link
To check the fusible link, touch the voltmeter lead
to the lower terminal on the terminal block (see Fig.
20). If the meter shows voltage, the safety fuse and
fusible link are good.
Figure 19. Testing the Transformer
Figure 20. Testing the Fusible Link
A main cause of an open fusible link is abnormal
wind conditions. This could be caused by improper
clearances to buildings and walls. See Section 2B for
proper clearances.
c. Wire Harness/Limit Switches
To test the white wire harness, which includes the
high limit switches, touch the voltmeter lead to the
white wire lead on the pressure switch. If the meter
shows voltage, the wire harness is good (see Fig. 21).
If no voltage registers, look for defective or loose
terminals and broken or charred wires. Also, check the
wiring on the field-installed Fireman's switch if there is
one. If the wiring and terminals are good, then the
limit switches are keeping the heater off.
The limit switches are located under the in/out
header. It is not necessary to remove the grate top to
replace the switches.
Remove the screw holding the limit switch cover,
and set it aside. Slide the retaining bracket toward the
rear of the heater until it comes free. Remove the two
high limits from their holes. Use this procedure to test
them (see Fig. 22):
1. Pull the black rubber insulation down far enough
to expose the two terminals on each high limit.

Page 16
2. Touch the voltmeter leads to both terminals on
one high limit switch, then the other. If the meter does
not register voltage on one terminal, the high limit is
bad, and must be replaced.
d. Testing the Pressure Switch
Touch the meter lead to the black wire on the
pressure switch (see Fig. 23) with the filter pump
running. If the meter registers no voltage, the contact
points are open. Use the following steps to check it.
1. Back wash the filter before trying to test the
pressure switch.
2. Connect one voltmeter lead to the blue wire
terminal on the transformer and the other lead to
the black wire terminal on the pressure switch.
3. Cycle the filter pump ON and OFF a few times.
The meter should jump to full voltage when the
pump cycles ON.
4. If the meter does not show voltage, either a
defective pressure switch or clogged siphon loop
tube could be the problem.
5. To clean the siphon loop tube, remove it from the
heater and the switch.
a. Blow out the tube until clear.
b. Fill the siphon loop tube and the switch with
heavy, non-detergent oil, SAE 50 preferred,
using a pump-type oil can (see Fig. 15).
c. Install the siphon loop tube to the heater and
the pressure switch. The tube must be air tight.
d. Start the filter pump and retest the pressure
switch (Step 2 through 4 above). If cleaning
the siphon loop tube does not correct the erratic
voltmeter, replace the pressure switch.
Step Three
Temperature Control
The temperature control is a solid-state device
using an electronic water temperature sensor called a
thermistor. The thermistor sensor is located in the
header.
Make sure the control panel rotary switch is in
either the POOL or SPA position, and that the corre-
sponding temperature control knob is set at a higher
temperature than the pool water.
With one of the voltmeter leads still clipped to the
blue wire terminal on the transformer, touch the other
lead to the black-yellow wire terminal on the ignition
control (see Fig. 24).
Figure 21. Testing Wire Harness and Limit Switches
Figure 22. Testing Wire Harness and Limit Switches

Model LC (Australia) Pool and Spa Heater Page 17
If the meter registers voltage, the temperature
control is okay. If no voltage registers, shut off all
electrical power to the heater and remove the tempera-
ture control panel (see Fig. 25) by removing the four
screws attaching the control panel to the front of the
heater.
Hold the control panel a few inches from the front
of the heater and inspect the back of the board for
obvious damage and loose wires. Make sure the three
wire connectors are tight and that the two black
thermistor wires are securely attached on the circuit
board.
If there is obvious damage to the control board or
the wire terminals, replace the control panel.
The thermistor can be checked by disconnecting
the two black wires on the back of the control panel
and temporarily connecting a new thermistor.
Alternate Method of Checking Thermistor
Use a fixed resistor (6000-9000 ohms) to check
the temperature control board. Remove the two black
wires and attach the resistor in the same location. The
heater should operate with the same temperature
control knob in the center of the dial. If the heater fails
to operate, replace the temperature control board.
Make sure the temperature control is properly
wired, then turn on power to the heater, holding the
replacement sensor as shown in Figure 25. The heater
should fire with the temperature control knob set above
Figure 23. Testing the Pressure Switch
Figure 24. Testing the Temperature Control
Figure 25. Thermistor Sensor Test
the center of the dial (approximate body temperature).
If the heater operates, replace the thermistor. If
the heater does not operate, replace the temperature
control panel which is available as a quick change
assembly. When installing the new control panel, be
sure the gasket is properly seated, and do not over-
tighten the mounting screws. That will distort the
mounting plate, which could lead to water leaking on
the control board.
Removal and Replacement of Temperature Control
If the four screws securing the temperature
control panel have not been removed, remove them.
Follow these instructions to complete the exchange:
Black / Yellow

Page 18
In almost all cases where there has been a
temperature control failure in the heaters, the ther-
mistor probe has not been damaged. If the probe has
been tested and found to be okay, there is no need to
remove the draft hood or flue cap, and the top assem-
bly. Disconnect the three different colored wires and
the two black wires from the back of the old tempera-
ture control.
Place the new unit in front of the control panel
opening and attach the two black wires and the three
colored wires. Be sure that the each colored wire is in
the same position on the new temperature control as it
was on the old.
Carefully seat the gasket. Secure the new control
panel to the front of the heater with the four screws.
Step Four
Ignition Control
If one lead from the voltmeter is attached to the
blue wire terminal on the transformer (that connects to
24V on the ignition control) and the other lead is
touched to the yellow/black 24V terminal on the
ignition control, and voltage registers, this indicates
that the safety controls, the temperature control, and
wire harness are not keeping the heater from firing (see
Fig. 26).
The following tests determine if the ignition
control is operating correctly. (Keep in mind that the
heater has a lockout ignition control. See Section 3C).
Before doing the electrical tests, make a visual check
of the ignition control components.
Pilot Burner. Make sure it is positioned next to the
main burner (see Fig. 27), and there is no soot or dirt
on it.
Figure 26. Testing the Ignition Control
Figure 27. Pilot Location Dimensions
High Voltage Ignition Lead. Connections must be
tight, and silicone rubber boots in place. Bare metal
parts of the high voltage ignition lead near the base of
the manifold bracket must be at least 9.6 mm from
other metal objects.
To test the ignition lead, position the control
panel switch to POOL or SPA and make sure the
temperature control knob is turned clockwise far
enough to call for heat. There will be a loud clicking
noise indicating the pilot electrode is sparking. If no
sparking is heard, pull the ignition lead from the
ignition control and hold the bare terminal 3 to 5 mm
from the ignition stud with a pair of insulated pliers
(see Fig. 28). If a spark does not jump the gap, replace
the ignition control.
NOTE: The ignition control cannot be repaired in the
field. If it does not operate properly, replace it.
Figure 28. High Voltage Ignition Test
3-5 cm
1.1
2.65
18.6
30.5