laguna 100K User manual

1
Rev. D 1-19-00 P/N 471243
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. Contact
your local Laguna Dealer for additional free copies of these instructions.
Do not store or use gasoline or other flammable vapors and liquids in
the vicinity of this or other appliances.
For Your
Safety
Warning: Improper installation, adjustment, alteration, service or maintenance can cause
property damage, personal injury or death. Installation and service must be performed by a
qualified installer, service agency or the gas supplier.
To
Consumer
Retain For
Future
Reference
Laguna 100K
ABOVE GROUND POOL & SPA HEATER
OPERATION & INSTALLATION MANUAL
IMPORTANT SAFETY INSTRUCTIONS
READ AND FOLLOW ALL INSTRUCTIONS
SAVE THESE INSTRUCTIONS
WARNING
WHAT TO DO IF YOU SMELL GAS
•Do not try to light any appliance.
• Do not touch any electrical switch; do not use any phone in your building.
• Immediately call your gas supplier from a neighbor's phone.
Follow the gas supplier's instructions.
• If you cannot reach your gas supplier, call the fire department.
WARNING
U.S. Patent Numbers
5,201,307 - 4,595,825
Laguna Pool and Spa Products • P.O. Box 8085 - Moorpark, CA 93020

2
P/N 471243 Rev. D 1-19-00
TABLE OF CONTENTS
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Warranty Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Safety Rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Direct Spark Ignition Lighting/Operation - Natural & Propane . . . . . . . . . . . . . . . . . . . 5
Safety Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Operating Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
To Turn Off Gas to Heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Millivolt Lighting/Operation - Natural & Propane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Safety Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Lighting Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
To Turn Off Gas to Heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Operating (Controls) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Heater Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Controls Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Maintenance Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Energy Saving Tips. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Spring and Fall Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Winter Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Chemical Balance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Pool and Spa Water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Installation Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Outdoor Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Indoor Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Plumbing Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Manual Bypass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Pressure Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Water Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Quick-Flange II Installation Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Gas Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Gas Line/Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Pipe Sizing Chart/Gas Pressure Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Regulated Manifold Pressure Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Gas Pressure Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Ventilation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Outdoor Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Indoor Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Vent Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Stack Type Indoor Draft Hood Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Indoor Draft Hood Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Transformer Wiring Instruction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Electronic Direct Spark Ignition Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Millivolt Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Trouble Shooting (General) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Parts List & Exploded View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21, 22
Warranty Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

3
Rev. D 1-19-00 P/N 471243
Introduction
Laguna 100K
ABOVE GROUND POOL AND SPA HEATERS
Congratulations on your purchase of a Laguna 100K high performance heating system. Proper installation and
service of your new heating system and correct chemical maintenance of the water will ensure years of enjoyment.
The Laguna 100K is a compact, lightweight and efficient gas fired high performance above ground pool and spa
heater that can be connected to schedule 40 CPVC or ABS pipe and has a built-in top. The heater features include
the following features.
• Reliable direct-spark ignition (DSI) system available in propane or natural gas versions.
• Millivolt standing pilot versions in propane and natural gas, when no convenient line power is present.
• Fuel gas input of 100,000 btu/hr with thermal efficiency in excess of 82%.
• Quiet and dependable operation from packaged burner system proven reliable in worldwide usage.
• Heat exchanger constructed of premium non-corroding materials including bronze headers standard.
• The controls have been designed to be very easy to troubleshoot and very easy to access and replace in the
rare event of a malfunction-making the Laguna 100K user friendly.
IMPORTANCE NOTICES FOR THE INSTALLER AND OPERATOR.
The manufacturer’s warranty may be void if, for any reason, the heater is improperly installed and /or operated.
Be sure to follow the instructions set forth in this manual.
These heaters are designed for the heating of swimming pools and spas, and should never be employed for use as
space heating boilers, general purpose water heaters, or for the heating of salt water.
CODES
The installation must conform with local codes or in the absence of local codes with the latest National Fuel Gas
Code, ANSI Z223.1, and the latest edition of the National Electrical Code, NFPA 70.
Installation in Canada to be made in accordance with the latest CAN/CGA-B149.1 or .2 and CSA C22.1
Canadian Electric Code, part 1.

4
P/N 471243 Rev. D 1-19-00
SAFETY RULES
1. Spa or hot tub water temperatures should never
exceed 104 °F (40 °C). A temperature of 100 °F
(38 °C) is considered safe for a healthy adult.
Special caution is suggested for young children.
2. Drinking of alcoholic beverages before or
during spa or hot tub use can cause drowsiness
which could lead to unconsciousness and
subsequently result in drowning.
3. Pregnant women beware! Soaking in water
above 102° F. (39° C.) can cause fetal damage
during the first three months of pregnancy
(resulting in the birth of a brain-damaged or
deformed child). Pregnant women should stick
to the 100° F. (38° C.) maximum rule.
4. Before entering the spa or hot tub, the user should
check the water temperature with an accurate
thermometer. Spa or hot tub thermostats may err
in regulating water temperatures by as much as
4° F. (2.2° C.).
5. Persons with medical history of heart disease,
circulatory problems, diabetes or blood pressure
problems should obtain their physician's advice
before using spas or hot tubs.
6. Persons taking medication which induce
drowsiness, such as tranquilizers, antihistamines or
anticoagulants should not use spas or hot tubs.
Operation
This instruction manual provides operating instructions, installation, and service information for the Laguna 100K
high performance heater. The information in this manual applies to the Laguna 100K natural gas and propane,
DSI and millivolt standing pilot heater models.
It is very important the owner/installer read and understand the section covering installation and recog-
nize the local code and state codes before installing the Laguna 100K. History and experience have shown
that most heater damage is caused by improper installation practices.
WARRANTY INFORMATION
The Laguna 100K pool heater is sold with a limited factory warranty. Specific details are described on the
back cover of this manual and a copy of the warranty and warranty registration card are included with
the product. Return the warranty registration card after filling in the serial number from the rating plate inside the
heater. For ordering parts, you should indicate model and serial numbers of the heater. If the parts are re-
quested for warranty, you must also indicate the date of installation.
PacFab's high standards of excellence include a policy of continuous product improvement resulting
in your state-of-the-art heater. We reserve the right to make improvements which change the specifi-
cations of the heater without incurring an obligation to update current heater equipment.
Should overheating occur or the gas supply fail to shut off, turn off the manual gas control valve to the
appliance. Do not use this heater if any part has been under water. Immediately call a qualified service
technician to inspect the heater and to replace any part of control system and gas control which has
been under water.
WARNING

5
Rev. D 1-19-00 P/N 471243
FOR YOUR SAFETY: READ BEFORE LIGHTING
A. This heater is equipped with an ignition device
which automatically lights the main burner. Do not
try to light the main burner by hand.
B. BEFORE OPERATING smell all around the heater
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 heater.
- 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.
- 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. Forced or attempted
repair may result in a fire or explosion.
D. Do not use this heater if any part has been under
water. Immediately call a qualified service
technician to inspect the heater and to replace any
part of the control system and any gas control
which has been under water.
LAGUNA 100K DIRECT-SPARK IGNITION LIGHTING/OPERATION-
NATURAL GAS & PROPANE
Operation (contd.)
OPERATING INSTRUCTIONS
1. STOP! Read the safety information above.
2. Set the thermostat to lowest setting, fully counterclockwise.
3. Turn off electric power to the heater.
4. This heater is equipped with an ignition device which automatically lights
the main burner. Do not try to light the main burner by hand.
5. Remove the control access door.
6. Turn the gas control lever horizontally to "OFF"; see Figure 1.
7. 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 gas, go to the
next step.
8. Turn the gas control lever vertically to "ON".
9. Replace the control access door.
10. Turn on the electrical power to the heater.
11. Set the thermostat to the desired setting.
12. If the heater will not operate, follow the instructions "To Turn Off Gas To
Heater" and call your service technician or gas supplier.
1. Set the thermostat to lowest setting.
2. Turn off all electric power to the heater if service
is to be performed.
3. Remove control access door.
4. Turn gas control lever horizontally to "OFF".
Do not force.
5. Replace control access door.
TO TURN OFF GAS TO HEATER
Figure 1.
If you do not follow these instructions exactly, a fire or explosion may result causing personal injury,
loss of life and property damage.
Since propane gas is heavier than air, escaping propane will accumulate and remain at ground level.
Do not attempt to light the heater. If you suspect a propane leak, lighting the heater can result in a fire
or explosion which can cause personal injury, death, and property damage.
WARNING

6
P/N 471243 Rev. D 1-19-00
LIGHTING INSTRUCTIONS
1. STOP! Read the safety information above.
2. Set the thermostat to the lowest setting.
3. Turn off all electric power to the heater.
4. Remove the control access door.
5. Push in the gas control valve slightly and turn clockwise to "OFF"; see Figure 2.
6. The knob cannot be turned from "PILOT" to "OFF" unless the knob is
pushed in slightly. Do not force.
7. 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 gas, go to next step.
8. Turn the knob on the gas control to counterclockwise to "PILOT"; see Figure 3.
9. Push the control knob all the way and hold in. Immediately light the pilot with
Presslite matchless ignition system by pressing the red igniter button, (located at
panel next to the gas valve). Continue to hold the control knob in for about (1)
minute after the pilot is lit. Release knob and it will pop back up. Pilot should remain
lit. If it goes out, repeat steps 4 through 7.
10. If the knob does not pop up when released, stop and immediately call your service
technician or gas supplier.
11. If the pilot, see Figure 4, will not stay lit after several tries, turn the gas control knob
to "OFF" and call your service technician or gas supplier.
12. Turn the gas control knob counterclockwise to "ON".
13. Replace the control access door.
14. If the heater will not operate, follow the instructions "To Turn Off Gas To Heater"
and call your service technician or gas supplier.
TO TURN OFF GAS TO HEATER
1. Set the thermostat to lowest setting.
2. Turn off all electric power to the heater if service is to be performed.
3. Remove control access door.
4. Turn gas control lever horizontally to "OFF". Do not force.
5. Replace control access door.
Operation (contd.)
MILLIVOLT LIGHTING/OPERATION- NATURAL GAS & PROPANE
FOR YOUR SAFETY: READ BEFORE LIGHTING
Figure 4.
PILOT ADJ
IN
ON
OFF
VENT
TH
TP
TH
TP
A. This heater has a pilot that must be lit manually. When
lighting the pilot follow these instructions exactly.
B. BEFORE LIGHTING smell all around the heater 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 heater.
- 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.
- 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. Forced or attempted repair may result in a
fire or explosion.
D. Do not use this heater if any part has been under water.
Immediately call a qualified service technician to inspect
the heater and to replace any part of the control system
and any gas control which has been under water.
Figure 3.
WARNING
If you do not follow these instructions exactly, a fire or explosion may result causing personal injury,
loss of life and property damage.
Since propane gas is heavier than air, escaping propane will accumulate and remain at ground level. Do
not attempt to light the heater. If you suspect a propane leak, lighting the heater can result in a fire or
explosion which can cause personal injury, death, and property damage.
Figure 2.
(Robertshaw valves)
(SIT valve)
All Gas knob's shown
in "OFF" position.

7
Rev. D 1-19-00 P/N 471243
HEATER OPERATION
GENERAL
The Laguna 100K DSI employs a microprocessor
based Direct Spark Ignition (DSI) system to light the
main burner and therefore has no pilot. The ignition
circuit operates at 24 VAC and requires that line
voltage 115/230 be supplied to the heater.
The Laguna 100K MV (Millivolt) requires no external
power source and the control circuit derives all its
power from the energy generated from the standing
pilot/ thermopile-generator combination. Note: Some
states ,including California, have energy
conservation regulations preventing the sale and
use of certain standing pilot (millivolt) equipment.
The Laguna 100K DSI Control utilizes a
microprocessor to continually and safely monitor,
analyze, and control the proper operation of the gas
burner. The DSI Control features LED diagnostics,
automatic one hour reset, and flame current test pins.
The LED is located on the DSI.
CONTROLS OPERATION (DSI SYSTEM)
Heat Mode
1. When a call for heat is received from the thermostat
supplying 24 volts to TH terminal on control, the
control will reset, perform a self check routine, and
flash the diagnostic LED for up to four seconds.
After a brief delay the gas valve is energized and
the ignition electrode begins to spark for the four
(4) second trial for ignition (TFI) period.
2. When flame is detected during the trial for ignition,
sparking is shut-off immediately and the gas valve
remains energized. The thermostat and main burner
flame are constantly monitored to assure the system
continues to operate properly.
a.When the thermostat is satisfied and the demand
for heat ends, the main valve is de-energized
immediately.
Screw A
Operation (contd.)
Knob Stopper
Figure 5.
OPERATING (CONTROLS)
DIRECT SPARK ELECTRONIC AND
MILLIVOLT MODELS
For convenience and economy all Laguna 100K
heaters are equipped with a thermostat on the front of
the heater control panel; see Figure 5.
Direct Spark Laguna 100K heaters are equipped
with an electronic thermostat while Millivolt Laguna
100K heaters have a mechanical thermostat.
The Pool/Off/Spa switch allows the heater to be turned
off when heating is not desired.
1. "ON" position - Maintains selected pool temperature.
2. "OFF" position - Heater will not come on regardless
of drop in pool temperature.
THERMOSTAT ADJUSTMENT
The knob with locking feature eliminates the need for
constant thermostat adjustments. Set the knob pointer
to the desired spa temperature.
NOTE
To eliminate error due to piping heat losses
measure pool temperature with an accurate
thermometer directly at the pool or spa.
If further adjustment is needed rotate the knob until the
desired temperature is obtained. This knob position
corresponding to your desired maximum pool or spa
temperature may now be preset (locked) by the knob
stopper which prevents the knob from being turned
beyond the maximum temperature you set.
THERMOSTAT KNOB STOPPER
Each thermostat is equipped with a mechanical stop
that can be locked or unlocked with use of a screw-
driver to prevent temperatures in excess of that
desired by the user; see Figure 5.
The maximum setting can be adjusted by loosening
the screw "A" and turning the stopper dial to desired
maximum setting. Lock the setting by tightening the
screw. The Mechanical stop is under the knob.
Ensure that the knob is stopping at the correct posi-
tion when the knob is rotated clockwise from a lower
temperature position.

8
P/N 471243 Rev. D 1-19-00
Failure to Light- Lockout
1. Should the main burner fail to light, or flame is not
detected during the trial-for-ignition (TFI) period
the control will go into lockout and the valve will be
turned off immediately.
2. Recovery from lockout requires a manual reset by
resetting the thermostat or turning off the ON/OFF
switch for a minimum period of 5 seconds.
IMPORTANT!
IT IS RECOMMENDED THAT NO MORE THAN
TWO IGNITION ATTEMPTS IN SUCCESSION
BE PERFORMED FOR NATURAL GAS
SYSTEMS . BEFORE FURTHER IGNITION
ATTEMPTS WAIT AT LEAST FIVE MINUTES
FOR GAS TO CLEAR.
FOR PROPANE (LPG) SYSTEMS ALLOW AT
LEAST FIVE (5) MINUTES BETWEEN IGNITION
ATTEMPTS FOR THIS HEAVIER-THAN-AIR
GAS TO SAFELY DISSIPATE. AFTER TWO
UNSUCCESSFUL IGNITION ATTEMPTS WITH
PROPANE OPEN THE BURNER ACCESS
DOOR AND WAIT AT LEAST THIRTY (30)
MINUTES BEFORE REPLACING DOOR TO
ATTEMPT FURTHER IGNITION ATTEMPTS.
NOTE
Normally the heater will light in the first or
second attempt. And with the exception of
a new installation or one that has been
shut down for an extended period, where
there is considerable air trapped in the gas
supply line, unsuccessful ignition
indicates other problems with the ignition
system - such as an unclean ignition
electrode impeding flame sensing.
3. If the thermostat is still calling for heat one hour
after a lockout the control will automatically reset
and attempt to ignite the burner again.
Flame Failure-Re-Ignition
1. If the established flame signal is lost while the
burner is operating, the control will respond within
0.8 seconds. The H.V. spark will be energized for a
trial for ignition period in an attempt to relight the
burner.
a. If the burner does not light the control will de-
energize the gas valve, shutting off the gas flow,
and the control will go into lockout as described
above in “Failure to Light-Lockout”. If flame is
re-established, normal operation resumes.
Operation - Heater (contd.)
Control Fault -Diagnostic LED Conditions
Error Mode LED Indication
Internal Control Failure Steady on
Flame Sense Fault 2 flashes
Ignition Lockout 3 flashes
The DSI Ignition Control can be accessed after removing
the heater’s front control panel. The diagnostic LED
located on the top of the DSI control will flash on for 1/4
second, then off for 1/4 second during a fault condition.
The pause between fault codes is 3 seconds.

9
Rev. D 1-19-00 P/N 471243
Proper Electrode Location
Proper location of the ignition electrode assembly is
important for optimum and safe system performance.
The electrode assembly should be located as noted in
Figure 6. The electrode assembly is NOT field
repairable and must be replaced if damaged.
Service Checks
Symptom Cause/Cure
1. Dead A. Miswired
B. Transformer bad
C. Fuse/circuit breaker open
D. Bad control (check LED for steady on)
2. Thermostat on, A. Miswired
no spark B. Bad thermostat no voltage @
terminal TH
3. Valve on, no spark A. Shorted Ign. electrode
B. Open HV Ign cable
C. Miswired
D. Bad DSI control
4. Spark on, no valve A. Valve coil open
B. Open valve wire
C. Bad control (also check voltage
between V1 & V2)
5. Flame okay during A. Bad electrode
TFI, no flame sense B. Bad S1 or HV wire
(after TFI) C. Poor ground at burner
D. Poor flame (check flame sensor
current, which follows)
Operation - Heater (contd.)
Flame Sensor Current Check
Flame current is the current which passes through
the flame sensor to ground. The minimum flame
current necessary to keep system from lockout is 0.7
microamperes. To measure flame current, connect
DC microammeter to the FC- FC+ terminals as
shown in Figure 7. The meter should read 0.7
microamperes or higher when the heater is firing.
Figure 6.
Figure 7.

10
P/N 471243 Rev. D 1-19-00
Maintenance
It is recommended that you check the following items
at least every six months and at the beginning of every
swimming season.
1. Examine the venting system. Make sure there are
no obstructions in the flow of combustion and
ventilation air.
2. Visually inspect the main burner and the pilot
burner flame (on millivolt models). The normal
color of the flame is blue. When flame appears
yellow, burners should be inspected and cleaned;
see Figure 8.
3. Keep the burner area clear and free from combus-
tibles and flammable liquids.
ENERGY SAVING TIPS
1. If possible, keep pool or spa covered when not in
use. This will not only cut heating costs, but also
keep dirt and debris from settling in the pool and
conserve chemicals.
2. Reduce the pool thermostat setting to 78°F. or
lower. This is accepted as being the most healthy
temperature for swimming by the American Red
Cross.
3. Use an accurate thermometer.
4. When the proper maximum thermostat settings
have been determined, tighten the thermostat knob
stopper.
5. Set time clock to start circulation system no earlier
than daybreak. The swimming pool loses less heat
at this time.
6. For pools that are only used on the weekends, it is
not necessary to leave the thermostat set at 78 °F.
Lower the temperature to a range that can be
achieved easily in one day. Generally, this would
be 10° F. to 15° F., if pool heater is sized properly.
7. During the winter or while on vacation, turn heater
off.
8. Set up a regular program of preventative
maintenance for the heater each new swimming
season. Check heat exchanger, controls, burners,
operation, etc.
MAINTENANCE INSTRUCTIONS
SPRING AND FALL OPERATION
If the pool is being used occasionally, do not turn the
heater completely off. Set the thermostat down to
65°F. This will keep the pool and the surrounding
ground warm enough to bring the pool up to a com-
fortable swimming temperature in a shorter period of
time.
WINTER OPERATION
If the pool won't be used for a month or more, turn
the heater off at the main gas valve. For areas where
there is no danger of water freezing, water should
circulate through the heater all year long, even though
you are not heating your swimming pool. This heater
should not be operated out doors at temperatures
below 32° F. (0° C.). Where freezing is possible, it is
necessary to drain the water from the heater. This
may be done by opening the drain valve located at the
inlet/outlet header allowing all water to drain out of
the heater. It would be a good practice to use
compressed air to blow the water out of the heat
exchanger.
Blue Flame
Figure 8.