Jacuzzi J-HN250C User manual

Jacuzzi®
J-HN250C, J-HN400C Heater
Installation and Operating Instructions

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INST 396 Jacuzzi® J-HN Series Heater V12-16
FOR YOUR SAFETY PLEASE READ BEFORE OPERATING
WARNING: IF YOU DO NOT FOLLOW THESE INSTRUCTIONS EXACTLY, A FIRE OR EXPLOSION MAY RESULT,
CAUSING PROPERTY DAMAGE, PERSONAL INJURIES, OR DEATH.
INSTALLATION, OPERATION AND SERVICE MANUAL –
FOR YOUR SAFETY- THIS HEATER MUST BE INSTALLED AND SERVICED ONLY BY AUTHORIZED PERSONNEL
QUALIFIED FOR POOL HEATER INSTALLATION, IMPROPER INSTALLATION, UNAUTHORIZED MODIFICATION,
AND/OR IMPROPER SERVICING AND OPERATION, CAN CAUSE SERIOUS INJURIES, PROPERTY DAMAGE, OR DEATH.
FOR AN ADDITIONAL SAFETY MEASURE, JACUZZI® STRONGLY ADVICES ALL INDOOR INSTALLATIONS HAVE A
CARBON MONOXIDE DETECTOR(S) PROPERLY INSTALLED IN THE VICINITY OF THE HEATER, AND IN ANY
ADJACENT OCCUPIED SPACES.
IMPROPER INSTALLATION, SERVICING, MAINTENANCE, AND/OR OPERATION WILL VOID THE WARRANTY.
WARNING: IMPROPER INSTALLATION, ADJUSTMENT, MODIFICATION, SERVICE OR MAINTENANCE CAN
CAUSE IMPROPER OPERATION RESULTING IN PROPERTY DAMAGE, PERSONAL INJURIES, OR DEATH.
INSTALLATION AND SERVICE MUST BE PERFORMED BY A QUALIFIED INSTALLER, SERVICE AGENCY, OR JACUZZI®
.
FOR
YOUR
SAFETY
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 HOME OR
BUILDING.
IMMEDIATELY CALL YOUR GAS SUPPLIER FROM OUT SIDE THE BUILDING.
FOLLOW THE GAS SUPPLIERS INSTRUCTIONS
IF YOU CANNOT REACH YOUR GAS SUPPLIER, CALL YOUR FIRE DEPARTMENT.
DO NOT STORE OR USE GASOLINE OR OTHER FLAMMABLE VAPORS AND LIQUIDS IN THE
VICINITYOF THIS HEATER OT OTHER APPLIANCES.
SAVE THESE INSTRUCTIONS

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INST 396 Jacuzzi® J-HN Series Heater V12-16
NOTICE TO INSTALLERS/ CODE REQUIREMENTS
This appliance must be installed in accordance with all local codes and/or the latest edition of the National Fuel Gas Code, ANSI
Z223.1/NFPA 54 and the latest edition of the National Electrical Code, NFPA 70 for the USA installations.
Installations in Canada must be done in accordance with the latest edition of CAN/CGA-B149.1 or .2 and the latest edition of CSA
C22.1 the Canadian Electric Code, part 1.
This Pool Heater, when installed in the USA, must be electrically grounded and bonded in accordance with all local codes, or in the
absence of local codes, with the National Electrical Code (NEC), NFPA 70,or in Canada, installation must be in accordance with the
CSA C22.1, the Canadian Electric Code , part 1
High voltage is present in some heater circuits making it mandatory that any electrical maintenance and repairs be attempted
only by properly qualified personnel.
CAUTION; Label all wires prior to disconnection when servicing controls, Wiring errors can cause improper and dangerous
operation. Verify proper operation after servicing
CARBON MONOXIDE GAS IS DEADLY: Exhaust gases from this pool heater may contain toxic levels of
Carbon Monoxide , a dangerous and poisonous gas that you cannot see or smell
SAVE THESE INSTRUCTIONS

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INST 396 Jacuzzi® J-HN Series Heater V12-16
SAFETY INFORMATION AND CONSUMER ADVICE
The US Consumer Product Safety Commission warns that elevated water temperatures can be hazardous, See advice below
for safe water temperature guidelines before setting temperature.
1. Spa or Hot tub water temperatures should never exceed 104º F (40ºC). A temperature of 100º F is considered safe
for a healthy adult. Special caution is recommended for small children
2. Drinking of alcoholic beverages before or during spa or hot tub use can cause drowsiness which could lead to
unconsciousness, resulting in drowning
3. Pregnant Women Beware ! Soaking in water above 102º F (39º C) can cause fetal damage during the first three (3)
months of pregnancy leading to the possibility of a brain damaged or deformed baby. Pregnant women should stick
to the 100º F (38º C) maximum rule
4. Before entering the spa or hot tub, the user should verify the water temperature with an accurate, independent
thermometer, as a check. Spa or hot tub heater thermostats may very in regulating water temperatures by as much
as 4º F (2.2º C)
5. Persons with a medical history of heart disease, circulatory problems, diabetes, or blood pressure problems should
obtain theirs doctors advice before using spa’s or hot tubes.
6. Persons taking medications which induce drowsiness, such as antihistamines or anticoagulants should not use spas or
hot tubs
Should overheating in the heater occur or should the gas supply fail to shut off, turn off the manual gas control valve to the
heater. Do not continue to 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/or gas control which has been under water.
SAFETY WARNINGS AND CAUTIONS
The HiNRG heater has been engineered to provide a long and safe life and incorporates state of the art safety features including
several redundant (back up) safety devices. But long term safe operation is also dependent on proper installation and regular service
and inspection of the heater and venting systems. The following section serves to highlight the hazards present with all gas fired pool
heaters.
FOR YOUR SAFETY!
This heater must be installed and serviced by an Professional Service Technician, qualified pool Heater installation and maintenance.
Some jursdictions may require that installers be Licensed. Check with your local building code authority about contractor licensing
requirements. Improper installation and/or operation could create carbon monoxide in flue gases which could cause serious injuries,
or death. Improper installation and/or operation will void the warranty.

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INST 396 Jacuzzi® J-HN Series Heater V12-16
RISK OF FIRE OR EXPLOSION FROM INCORRECT FUEL USE
Do not try to operate a pool heater set up for Natural Gas on Propane or the reverse. Only Qualified Gas appliance service
professionals should attempt to convert the heater from one fuel to another with advice and instructions from the manufacture.
Alternately, the heater may require conversion at a factory authorized repair depot. Serious malfunction of the burner can occur
which may result in loss of life. The heater is available for operation on Natural Gas or Propane Gas only –it is not designed to
operate on any other fuels. Refer to the nameplate for the type of gas the heater is factory equipped for use with, only use fuel gas
stated on nameplate.
RISK OF FIRE OR EXPLOSION FROM FLAMMABLE VAPORS
Do not store Gasoline (petrol), cleaning fluids, paint, varnishes, or other flammable liquids near or in the same room as the heater
RISK OF EXPLOSION IF HEATER IS INSTALLED NEAR PROPANE STORAGE TANKS
Propane (LPG) gas is heavier than air which causes the gas to settle (pool) in the lowest point of the room. Without dissipating. Any
leaking source is highly dangerous. Consult local codes and fire protection authorities about specific installations requirements and
restrictions. Locate the heater away from propane Gas Storage and filling equipment as specified by the latest editions of the
Standard for Storage and Handling of Liquefied Petroleum Gases, CAN/CSA B149.2, or the National Fuel Gas Code, ANSI
Z223.1/NFPA 54.
RISK OF FIRE, CARBON MONOXIDE POISONING, OR ASPHYXIATION FROM LEAKING
EXHAUST VENT, OR IF INCORRECTLY VENTED.
Only qualified service technicians should attempt to service the heater and/or vent system, as leakage of exhaust flue gases or
flammable gases may result from improper servicing. This heater does not use a draft hood and the exhaust is under positive
pressure from burner fan blower. The heater is supplied with an integral vent system for outdoor installations. A factory vent
conversion kit is available for installations in enclosures (Canada) or indoor installations (USA) use only the specified listed vent pipe
(ducts) and fittings for Category III vents, when the heater is installed in an enclosure or indoors. In Canada, this heater can only be
installed outdoors, or in an enclosure that is not normally occupied and has no openings directly connected (communicating) to
occupied areas, See Venting Section of this manual for more details.

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INST 396 Jacuzzi® J-HN Series Heater V12-16
CARBON MONOXIDE IS DEADLY
EXCESSIVE CARBON MONOXIDE EXPOSURE CAN CAUSE BRAIN DAMAGE OR DEATH
TH U.S CONSUMER PRODUCT SAFETY COMMISION WARNS THAT CARBON MONOXIDE IS AN INVISIBLE
KILLER.CARBON MONOXIDE IS A COLORLESS AND ODORLESS GAS.
Exhaust from this pool heater may contain toxic levels of carbon monoxide, a dangerous and poisonous gas you cannot see or smell.
Symptoms of carbon monoxide exposure or poisoning include dizziness, headache, nausea, weakness, sleepiness, involuntary muscle
twitching, vomiting, and clouded thinking.
If you experience any of the above symptoms, immediately turn off the heater, leave the area of the heater and get fresh air
immediately. The heater is unsafe to continue in operation and will require a thorough inspection of ti and its venting system by a
qualified gas appliance servicing professional, before being returned to service.
Never use the heater in an indoor installation without the factory specified proper venting system and lisited vent components.
Do not use this heater inside the home or in enclosed areas such as garages, covered patios, cabanas or similar structures, unless a
proper vent system meeting both the factory recommendations and the recommendations of the National Fuel Gas Code or CGA-
B149.1 or .2 is properly installed.
If used outdoors, install away from open windows, doors, vents. Other openings, and away from air handling equipment ( air
conditioners etc) using recommended clearances noted in venting requirements section of this manual.
Newly commissioned vent systems should be tested for proper vent performance by a qualified gas appliance service professional.
And the heater should be tested each heating season for proper operation including inspection of all venting system. The use of a
portable Carbon Monoxide (combustion) analyzer to test for optimum system operation is STRONGLY RECOMMENDED.
IT IS STRONGLY RECOMMENDED THAT BATTERT OPERATED, LISITED CARBON MONOXIDE DETECTORS(ALARMS) BE
INSTALLED IN ANY OCCUPIED SPACES ADJACENT TO INSTALLED HEATER, AND FOR INDOOR HEATER
INSTALLATIONS INSTALL AN ADDITIONAL CARBON MONOXIDE DETECTOR(ALARM) NEAR THE LOCATION OF THE
HEATER

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INST 396 Jacuzzi® J-HN Series Heater V12-16
INDEX
INTRODUCTION………………………………………………………………………………………………………………….7
SAFETY RULES……………………………………………………………………………………………………………………..7
OPERATING INSTRUCTIONS ……………………………………………………………………………………………………8
CHEMICAL BALANCE ……………………………………………………………………………………………………………..9
CORROSION PREVENTION IN HEATERS ……………………………………………………………………………………….9
DIGITAL THERMOSTAT OPERATION ………………………………………………………………………………………….10
DISPLAY SYMBOL INDICATION ………………………………………………………………………………………………...11
MAINTENANCE……………………………………………………………………………………………………………………11
WINTER OPERATION …………………………………………………………………………………………………………….11
INSTALLATION ……………………………………………………………………………………………………………………12
GAS SUPPLY LINE INSTALLATION ………………………………………………………………………………………………12
HEATER DIMENSIONS …………………………………………………………………………………………………………….13
INDOOR FLUE INSTALLION ……………………………………………………………………………………………………..14
WALL TERMINATIONS …………………………………………………………………………………………………………..16
CLEARANCES …………………………………………………………………………………………………………………….17
VENTILATION ……………………………………………………………………………………………………………………17
INDOOR INSTALLATION ….…………………………………………………………………………………………………….23
ELECTRICAL CONNECTION ……………………………………………………………………………………………………24
GAS CONNECTION ………………………………………………………………………………………………………………25
WATER PRESSURE SWITCH ADJUSTMENT ……………………………………………………………………………………..26
FITMENT OF PRESSURE RELIEF VALVE ………………………………………………………………………………………….27
NORMAL HEATER OPERATION …………………………………………………………………………………………………27
HEADER CONVERSION FROM RIGHT TO LEFT INLET / OUTLET …………………………………………………………..28
TESTING GAS PRESSURE …………………………………………………………………………………………………………31
PERFORMANCE DETAILS …………………………………………………………………………………………………………32
TROUBLE SHOOTING …………………………………………………………………………………………………………….33
ELECTRICAL DIAGRAM …………………………………………………………………………………………………………...33
MAINTENANCE OF YOUR POOL HEATER ……………………………………………………………………………………..34

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INST 396 Jacuzzi® J-HN Series Heater V12-16
INTRODUCTION
Congratulations on your purchase of a Jacuzzi® J-HN Series Pool and Spa Heater. Proper installation and service of your new
heating system and correct chemical maintenance of the water will ensure years of enjoyment. The Jacuzzi® J-HN Series Heater is a
compact lightweight and highly efficient gas fired pool and spa heater. It is equipped with features that take advantage of new
technology to provide a user friendly, efficient and environmentally friendly pool or spa heater.
The Jacuzzi® J-HN Series heater can safely be connected to PVC pipe. It accepts a wide range of water flow rates from as little as
31gallons (120 liters) per minute making it perfectly suitable for energy efficient variable speed pool and spa pumps. In addition, it is
equipped with electronic start up and an accurate electronic thermostat to ensure ease of use and accurate temperature control.
The electronic display shows at a glance the operational status of the heater.
WARNING: The appliance is not intended for use by young children or infirm person without supervision. Please ensure
that young children are supervised to ensure that they do not play with the appliance.
WARNING: Electrical maintenance and repairs of this equipment must only be done by qualified persons in accordance
with the latest edition of the National Electrical Code, NFPA 70 (“NEC”) and/or all applicable local and state codes and ordinances.
Installations in Canada must be in accordance with the latest edition of CSA C22.1 –the Canadian Electric Code, part 1
(“CEC”)Improper installation could cause an electrical hazard which may result in death or serious injury to pool users, installers or
others due to electrical shock, and/or property damage. Always disconnect power to the pool pump at the house circuit breaker
before servicing the pump. Failure to do so could result in death or serious injury to pool users, installers or others. To reduce the
risk of injury, do not permit children to use this product unless they are closely supervised at all times.
SAFETY RULES
Spa or hot tub water temperature should never exceed 104˚F (40º C).
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.
Pregnant women beware! Soaking in water above 100˚F (38º C) during the first three months of pregnancy can cause fetus damage.
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 (2º C).
Persons with a medical history of heart disease, circulatory problems, diabetes or blood pressure problems should obtain their
physician’s advice before using spas or hot tubs.
Persons taking medications which induce drowsiness, such as tranquilisers, antihistamines or anticoagulants, should not use spas or
hot tubs.
WARNING!Should overheating occur or the gas supply fails 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. For your safety –read before lighting
This appliance is equipped with an ignition device which automatically lights the burner. Do not try to light the burner by hand.
BEFORE OPERATING smell all around the appliance area for gas. Be sure to smell next to the floor because some gas is heavier
than air and will settle on the floor.
WHAT TO DO IF YOU SMELL GAS. Do not try to light any appliance. Do not touch any electrical switch. Do not use any
telephone in your building. Immediately call your gas supplier from a neighbor’s house. Follow the gas suppliers instructions. If you
cannot reach your gas supplier, call the Fire Department.
WARNING: DO NOT PLACE ARTICLES ON OR AGAINST THIS APPLIANCE
WARNING: DO NOT USE OR STORE FLAMMABLE MATERIALS NEAR THIS APPLIANCE
WARNING: DO NO SPRAY AEROSOLS IN THE VICINITY OF THIS APPLIANCE WHILE IT IS IN OPERATION.
NOTE –SERVICING SHALL BE CARRIED OUT ONLY BY AUTHORIZED PERSONNEL.
WARNING –Carbon Monoxide Gas –a potential by product of an incorrectly installed and vented heater can be deadly
or cause irreparable brain damage. Heater must be installed by an authorized person and all ventilation must comply with these
instructions and applicable codes and standards. NEVER enclose an outdoor heater. Never block the flue or heater louvres.
NEVER leave articles on top of or leaning against Heater. Indoor Heaters MUST be installed with adequate and permanent
ventilation in accordance with all applicable codes and these instructions.
CAUTION –This heater is suitable for 220Vac connection only
WARNING –risk of carbon monoxide poisoning or asphyxiation. Never install a draft diverter with this appliance. Ensure
adequate and permanent ventilation according to all codes is provided when installing indoors. ENSURE only the manufacturers
flue kit is used when installed indoors. DO NOT INSTALL standard heater INDOORS unless manufacturer flue kit is installed.

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INST 396 Jacuzzi® J-HN Series Heater V12-16
OPERATING INSTRUCTIONS
FOR YOUR SAFETY READ BEFORE OPERATING
WARNING: If you do not follow these instructions exactly, a fire or explosion may result causing property
damage, personal injury or loss of life
A. This appliance does not have a pilot. It is equipped with an ignition device which automatically lights the burner. Do
not attempt to light the 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
appliance. Do not touch any electric switch, do not use any phone in your building. Immediately call your gas supplier
from a safe area away from the heater. Follow the gas suppliers instructions. If you cannot reach your gas supplier,
call the fire department.
C. If the gas valve is malfunctioning and not admitting gas to burner, don’t try to repair it, call a qualified service
technician. Force or attempted repair mat 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
appliance and to replace any part of the control system and any gas control which has been under water
OPERATING INSTRUCTIONS
1. STOP! Read the safety information above on this label
2. Turn Off all electrical power to the Heater
3. Do not attempt to light the burner by hand
4. Wait five (5) minutes to clear out any gas. If you then smell gas, STOP!, Follow “B” in the safety information above
on this label. If you don’t smell gas, go to the next step.
5. Turn on the water circulation pump.
6. Turn on the power to the heater and press the Pool/Spa button to select Pool or spa.
7. Set the thermostat to desired setting and the ON/OFF switch to the “ON” position.
8. The Heater will take approximately 125 seconds to complete ignition cycle. The heater will reattempt to ignite the
burner automatically repeating the final ignition sequence for a total of three (3) attempts before locking out system.
9. If the appliance does not operate, turn heater power supply off. Repeat instructions 5 to 7 above. If the appliance
still does not ignite, call your service technician
TO TURN OFF GAS TO HEATER
1. TURN OFF ALL ELECTRIC POWER TO THE HEATER IF SERVICE IS TO BE PERFORMED.
2. Turn off manual Gas tap in gas supply line prior to Heater

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INST 396 Jacuzzi® J-HN Series Heater V12-16
CHEMICAL BALANCE
WARNING It is imperative that correct chemical balance be maintained in your pool and spa water, otherwise corrosion
of your heater may occur. Corrosion of the heat exchanger voids warranty. Your local pool shop specialist or spa retailer can
advise correct chemical balance. Your water should be checked and maintained regularly by a pool water professional. As a guide
the following parameters may be used.
pH
7.2 to 7.6
Total Alkalinity (ppm)
80 to 120
Calcium Hardness (ppm)
150 to 250
Salinity (ppm)
4000 max. Excessive salt can damage your heater
You should test your water chemical balance at least on a weekly basis.
Excessive sanitiser can damage your heater. Chlorine should not exceed 3 ppm and bromine should not exceed 5 ppm. Salt
chlorinators, especially when used on spa pools or indoor or covered pools, can easily produce excessive chlorine levels which will
damage the heater internals.
CORROSION PREVENTION IN HEATERS
All Gas pool and spa heaters incorporate copper or copper nickel to make their heat exchangers as it is the most efficient material
in transferring heat from the combustion chamber into the water. The typical life expectancy of a well maintained pool/spa heater is
between 5 and 12 years.
The addition of sanitiser (Chlorine, Bromine etc.) and other water balancing and conditioning chemicals can increase the rate of
wear and tear on the heat exchanger and associated parts in your heater.
There are three most common reasons for heat exchanger corrosion which can be avoided with a little care and attention.
1. Excessive Sanitiser.
This means too much Chlorine or Bromine in the water. Be careful, if the level of Chlorine or Bromine is excessively high,
your test kit (and the pool shops) may not read accurately or indeed may show a nil reading. Any time a salt chlorinator is
operating for extended periods (when heating the swimming pool from cold), particularly if the weather is overcast or the
pool is enclosed or covered, the Chlorine level may exceed normal levels. When heating a Spa or Pool, turn the
chlorinator down or off for the duration of the heating period.
2. Out of balance water.
The water balance is a combination of pH, total alkalinity, Calcium hardness and temperature. Balanced water will help
prevent corrosion of your heater. Balanced water should be between a pH of 7.2 - 7.6.
3. The addition of acid to lower pH.
Acid must always be added in small quantities and spread over the pool surface evenly, not added in to the skimmer. Do
not add a Gallon at a time, add a cup full each day to lower your pH.
WARNING: If you have a salt chlorinated INDOOR pool or COVERED pool be very careful of the level of Chlorine being
produced. If you use a salt chlorinated spa be very careful of the level of Chlorine as the Chlorinator is usually sized for the pool
and therefore should be switched off when heating the spa. Leaving the chlorinator on can raise the chlorine level very rapidly in a
small volume of water.
These comments are intended as a guide only and are not definitive answers or recommendations on pool water chemistry. Astral
Pool’s intention is to provide a little understanding of the potential problems of water chemistry and the dangers of corrosion to
heaters (and other pool equipment and fittings).
YOUR WATER SHOULD BE ADJUSTED & BALANCED PRIOR TO ANY CORRODED PARTS BEING REPLACED.

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INST 396 Jacuzzi® J-HN Series Heater V12-16
DIGITAL THERMOSTAT OPERATION
DESCRIPTION
The sophisticated digital thermostat provides temperature read out, set point temperature, operating status of the heater and any
fault conditions.
TEMPERATURE DISPLAY
The temperature display indicates water temperature in the inlet of the heater. Therefore the pump must be operating for an
accurate pool or spa water temperature to be displayed.
Comfortable pool temperature is between 78˚F and 86˚F (26º & 30º C). Normal spa temperature is between 96˚F and 101˚F.(36º &
38º C) To select your desired temperature press the up or down button repeatedly until the desired temperature is reached.
To prevent rapid cycling of the heater, the thermostat has an inbuilt time delay which prevents the heater from turning on for two
minutes after the set point has been reached. If the time delay is activated, the symbol “L” will be displayed on the LCD screen on
the front of the heater. This is part of normal operation.
Should a fault condition occur, the heater will lock out and prevent further heating. A lock out condition is indicated by the symbols
F0 to F3. To reset a lock out condition, turn the power off for five seconds.
When the water temperature is heated to within 1.8°F of the thermostat set point, the Jacuzzi® J-HN Series series heater burner
will turn down so that the set point is not exceeded. In addition, the set point is maintained very accurately, so that when using
your spa or pool, you will notice very little variation in water temperature.
POWER LOSS TO UNIT
The following will happen in event of power loss to the unit;
WHILE THE UNIT IS ON OR IN LOCK OUT MODE
The unit will turn off. If power is restored before the fan has time to stop, around 10 seconds then the unit will not light. You will
need to turn off power to the unit and wait for 10 seconds or until fan has stopped and then turn the power back on. Turn the unit
on if it’s not already. The unit will relight.
If the power is off for more than 10 seconds or enough time for the fan to stop then the unit will turn back on and relight
automatically once the power is restored.
WHILE THE UNIT IS OFF
When power is restored the unit will remain in the off mode.

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INST 396 Jacuzzi® J-HN Series Heater V12-16
DISPLAY SYMBOL INDICATION
Under fault conditions the thermostat will display a set of alpha numeric symbols to indicate the status of the heater. The meaning
of each symbol and action to be taken are listed as follows:
SYMBOL
MEANING
ACTION
Temp Display
Unit has power
No Action
F0
Heater locked off, thermistor wire disconnected or water at 36ºF
(0º C) (freeze conditions).
If water temperature reads greater than
36ºF ) (0º C), phone for service.
F1
Thermostat reads greater than 113ºF.(45ºC)
Allow water to cool below 104ºF (40º
C), turn heater off then on again.
F2
Mechanical Hi Limit greater than 109ºF or 125ºF (43º or 52ºC)
and/or
Low water flow
Allow water to cool below 86ºF (30º C),
turn heater off then on again.
Make sure water is flowing through
heater.
F3
Thermistor Fault.
Service required. www.Jacuzzipool.com
L
Heater locked out on time delay for 2 minutes.
No Action. Heater will automatically
reset after the time delay.
Pump operating and sufficient water pressure to operate heater.
No Action.
Thermostat calling for heat. Electronic Flame Supervision
operating.
No Action.
Burner Operating
No Action
MAINTENANCE
It is recommended that you check the following at least every six months and at the beginning of every swimming season.
1. Examine the flue outlet and panel louvers for blockages. Make sure there are no obstructions to the flow of air to or from the
appliance.
2. Keep the heater area clear and free of combustibles and flammable liquids. Chlorine should not be stored in the vicinity of the
heater. Chlorine and acid vapors, when drawn through a heater, can rapidly cause corrosion of the heat exchanger.
3. Keep the heater area free from garden refuse and debris. This will help prevent insects nesting in the unit and ensure extended
life and reliability of your heater.
4. Have your heater professionally inspected at least every 2 years or when used daily for 6 months each year, have it inspected
once a year.
WINTER OPERATION
If the pool is not being used for a month or more, turn the heater off at the main gas isolation valve. For areas where there is no
danger of freezing, water should circulate through your heater all year long even though you are not heating your pool.
It is necessary to drain the water from the heater where freezing is possible. This may be done by loosening the inlet or outlet
barrel union. If the heater is below water level, isolate it from the pool first by closing shut off valves before and after the heater.
CAUTION:If the heater has been drained for freezing conditions, do not turn on until the system is circulating water

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INST 396 Jacuzzi® J-HN Series Heater V12-16
INSTALLATION
WARNING:THIS APPLIANCE MUST BE INSTALLED BY A LICENSED AND BONDED POOL EQUIPMENT INTALLERS.
AUTHORISED PERSON. Refer to heater data plate for specifications of gas type, gas consumption, burner pressure and water
pressure.
This appliance must be installed in accordance with local regulations and
For a heater in which no provision is made for a vent permanently open between the water circuit and atmosphere a pressure relief
valve must be fitted in accordance with
LEVELLING OF THE HEATER
With OUTDOOR Installations it is advisable to have the Heater Level from left to right across the heater and have it slightly angled
(approx. 5º) to the rear to help with drainage of the Flue from water after rain.
FLOW RATES
The Jacuzzi® J-HN Series Heater requires a minimum of 31Gallons (120 liters) per minute (254 ft3/h)(7.2 m3/hr) and a maximum
flow rate of 132 Gallons (500 liters) per minute (1059 ft3/h) (30 m3/hr). It is recommended that an external bypass valve capable of
bypassing some water be installed when flow rates exceed 99 gallons (375 liters) per minute (794 ft3/h) (22.5 m3/hr).
WATER CONNECTIONS
The heater should always be installed after the pump and filter. The water connections are located on the right hand side of the
heater. The inlet and outlet are clearly marked. Water connections require 2” high pressure PVC glue-in plumbing. It is
recommended that Class 12 (PN12) pipe be used to connect to the heater.
All automatic sanitising devices must be installed after the heater and in such a way that the sanitiser cannot enter the heater
without first mixing with the water in the pool or spa. Sanitisers that are connected prior to the heater will void heater warranty.
A non-return valve is not required to be fitted between the filter and the heater.
GAS SUPPLY LINE INSTALLATION
Check heater rating plate to verify the type of fuel gas your heater is equipped to burn. Generally, natural gas is supplied at a lower
pressure from the local gas utility and requires larger diameter piping than a propane installation. Propane (LPG) typically requires
the installation of a storage tank, and often the LPG supplier will size and place the tank and the required LPG regulators and piping.
Consult your local LPG supplier for assistance with your LPG installation. The pipe sizing charts that follow are all based on Natural
Gas with a specific gravity of 0.65, and Propane (LPG) with a specific gravity of 1.55.
The utility provided (natural gas) meter in new construction is often a source of excessive pressure loss unless sized for the
additional load of a pool heater used in combination with all other appliances in the home (being supplied from the same line).
Consult your local natural gas company.
Generally, the longer the piping run, the higher the pressure drop (loss). Usually based on your delivery pressure (at your utility
supplied as meter and house gas pressure regulator) as a starting point pressure. Larger diameter piping, while costly, has less
frictional gas pressure losses than smaller piping. The pipe sizing tables that follow are based on piping downstream (after) your gas
meter running up to the heater. Elbows are a costly source of pressure drop (loss), each being equivalent to the loss from 3
additional feet of straight piping. So minimise their use. Step the piping size down as close to the heater as possible.
The Jacuzzi® J-HN series heater requires a minimum supply pressure of 5 in w.c. for natural gas and 11 in w.c. for propane (LPG).
These pressure (dynamic pressure) must be verified under load (heater fired) as an incorrect reading (static pressure) wil be
obtained with heater off. The heater may not operate correctly without proper gas supply pressure (see page 32 for further
details.)
All the gas supply piping installation must conform to all local codes, and must conform to the requirements of the latest edition of
the National Fuel Gas Code ANSI Z223.1/NFPA 54 for US installations, or in Canada with the latest edition of CSA B149.1, Natural
Gas and Propane Installation Codes.
Always install a manual shut-off valve (gas cock) and sediment trap outside of the heater cabinet –immediately before gas line enters
heater. Do not install a gas line union inside heater cabinet .
The piping installation must be tested for leaks and is typically tested at pressures above ½ psig –therefore piping must be isolated
from other gas appliances in use during pressure testing. Check with your local gas company or local building code inspection
department for local code requirements.

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INST 396 Jacuzzi® J-HN Series Heater V12-16
PLUMBING DIAGRAM
1. Plumbing in high pressure 2” (50mm)PVC pipe.
2. Connections to heater in Class 12 or higher.
3. All Salt System Chlorinators or Sanitisers to MUST be installed after the heater.
HEATER DIMENSIONS

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INST 396 Jacuzzi® J-HN Series Heater V12-16
INDOOR FLUE INSTALLATION
For indoor installations a 5” (125mm) flue and termination cowl must be fitted to the heater. The heater may be installed with a
maximum of 52 feet (15 meters) of flue including 3 bends or of 26 feet (8 meters) of flue with a total of 5 bends.
The flue and termination cowl must be ordered from www.Jacuzzipool.com
Part # 78285 13 feet (4 meters) spiral flue with termination cowl
Part # 78249 13 feet x 5” ( 4 meter x 125mm) flue extension (maximum of three additional to make a total length of 52 feet
(16 meters)
Note; Maximum length for HiNRG 400 Propane is 28 feet (8.5 meters
Heater must be installed to local or state regulations. Access and suitable working areas must be available to the heater.
Flue pipe is supplied with a galvanized sleeved end for the external application and an non sleeved aluminum end for fitment to
appliance. The flue pipe can be cut shorter with a knife/saw.
1
Pool Heater –Outdoor Model.
2
Using a Phillips Head Screw driver
unscrew 4 x Screws from Flue Cover
Plate.
3
Remove Flue Cover Outdoor Insert.
4
Pre bend the flue where required.
Bends are made by curving the flue pipe
around a gentle radius such as a pipe or
knee. Do not over bend and kink flue
pipe. Keep bends to a minimum and
use as large as radius as possible.
Minimum internal radius is 10”(250mm).
Bends can be straightened if required.

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INST 396 Jacuzzi® J-HN Series Heater V12-16
5
Take the Flue Cover Indoor Insert.
6
Take the Flue and FEED it through the
Indoor Insert.
7
Fit flue pipe to appliance (non-sleeved
end of flue). Fit by sliding it over the flue
connection spigot as far as possible.
8
Slide Indoor Insert Panel down the flue
and Screw into position with 4 x Screws.
9
Pool Heater –Indoor Model.
10
Form extra bends where required. Care
should be taken when forming bends to not
create a low point where condensation may
collect. Condensation should be able to
drain to the heater or out the flue outlet.
The flue should be bracketed at intervals of 1
M using standard 5” (125 mm) standoff
brackets available at most plumbing suppliers.

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INST 396 Jacuzzi® J-HN Series Heater V12-16
2
ROOFTOP TERMINATIONS
All flue exiting the roof must be shielded with the gal cover. Extra lengths of gal can be supplied. Decktite fittings / flashings must
be attached to the galvanized flue cover. Brace flue in high wind applications.
Locate flue cowl onto reduced end of the gal outer covering / flue pipe. Attach with rivets / screws to hold into place.
WALL TERMINATIONS
Ensure location is suitable as flue gases exit all around cowl and may blow back onto walls, eaves and features causing discolouration
or mould and moisture issues. Condensation will occur around the flue exit area and condensation may drip from the flue outlet.
All flues exiting the wall must be shielded with the gal cover. Extra lengths of gal can be supplied. Decktite fittings / flashings / wall
exiting covers must be attached to the galvanized flue cover.
For long extensions of flue exiting the wall bracing may be required in high wind applications.
Locate flue cowl onto reduced end of the gal outer covering / flue pipe. Attach with rivets / screws to hold into place. Ensure a
drain hole in the cowl is facing down.
The flue pipe must slope slightly towards the cowl for the last horizontal run (approx 2º) to allow condensation to drain.

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INST 396 Jacuzzi® J-HN Series Heater V12-16

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INST 396 Jacuzzi® J-HN Series Heater V12-16
CLEARANCES
Installation clearances must comply with Local or State laws. The heater is approved for installation at reduced clearances as below.
SURFACE TYPE
COMBUSTIBLE
NON
COMBUSTIBLE
CLEARANCES
(inches)
OUTDOOR
FRONT
12” (300mm)
12” (300mm)
BOTH SIDES
12” (300mm)
12” (300mm)
REAR
12” (300mm)
2” (50mm)
ABOVE
39” (1000mm)
39” (1000mm)
INDOOR
FRONT
12” (300mm)
12” (300mm)
BOTH SIDES
12” (300mm)
2” (50mm)
REAR
12” (300mm)
2” (50mm)
ABOVE
20” (500mm)
20” (500mm)
N.B. HEATERS MUST BE INSTALLED ON A FIREPROOF BASE
VENTILATION
When installing the heater indoors, it is imperative that an adequate supply of fresh air is provided for combustion. Failure to
provide adequate ventilation voids all warranties and may be a danger to persons or property.
Two permanent openings shall be provided directly to outside. The openings shall be located to ensure the distance between the
top of the upper opening and the ceiling of the room or enclosure, and the distance between the bottom of the lower opening and
the floor of the room or enclosure does not exceed 5% of the height of the room or enclosure.
The minimum vertical dimension of any free ventilation opening shall be ¼1/4” (6 mm).
The minimum free ventilation area provided directly outside by each opening shall be:
MODEL
AREA
(in2)
J-HN 250
116
(75,000 mm2)
J-HN 400
186
(120,000mm2)
If ventilation provided is obtained from an adjacent room then these areas will increase.
The following diagram is provided as a guide only. All flue works and installation work must be carried out by an authorized person.
Venting and flue connections installation must conform to local regulations. Care must be taken to provide the correct ventilation
and correct flue connections materials in close proximity to combustible surfaces.

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INST 396 Jacuzzi® J-HN Series Heater V12-16
WARNING: Do not install spa blowers in the same room as a gas heater. This is potentially dangerous to spa users.
WARNING:Do not store chemicals or fuel in the same room as the gas heater. This may cause fire or explosion. When
installing in a garage the Jacuzzi® J-HN Series Heaters must be installed 17”(450mm) above floor level.
OUTDOOR VENTING INSTALLATION-DIAGRAM AND CLEARANCES