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FOR YOUR SAFETY - This product must be installed and serviced by authorized person-
nel, qualified in pool/spa heater installation. Improper installation and/or operation can
create carbon monoxide gas and flue gases which can cause serious injury, property
damage, or death. For indoor installations, as an additional measure of safety, Waterpik
Technologies strongly recommends installation of suitable Carbon Monoxide detectors in
the vicinity of this appliance and in any adjacent occupied spaces. Improper installation
and/or operation will void the warranty.

H0256100E

Installation and Operating 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 neighbor’s phone.  Follow the gas

supplier’s instructions.

• If you cannot reach your gas supplier, call the fire department.

Installation and service must be performed by a qualified installer, service
agency or the gas supplier.

Installation and
Operation Manual

LX

® 

and

LT

®  

Low NOx*

Gas-Fired Pool
and Spa Heater

Model LX/LT-Low NOx*
Natural Gas and LP

*Only models using natural gas are certified
  as meeting low NOx emissions requirements.

Model
LX250-L
Shown

Summary of Contents for LX

Page 1: ...lowed 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 ap...

Page 2: ...20 6 4 Auxiliary Time Clock Wiring 21 6 5 RemoteOperation 21 SECTION 7 Operating Instructions 7 1 NormalOperation 23 7 2 Start Up 23 7 3 TemperatureControls 24 7 3 1 InformationDisplayed 24 7 3 2 Turn...

Page 3: ...ure to read and comply with all of the warnings and cautions 1 2 1 Spa Hot Tub Safety Rules WARNING The following Safety Rules for Hot Tubs recommended by the U S Consumer Product Safety Commission sh...

Page 4: ...cover will reduce heat loss conserve chemicals and reduce the load on filter systems 1 3 Warranty The LX and LT Low NOx heaters are sold with a limited factory warranty Details are specified on the ba...

Page 5: ...t pipe needed for indoor installations in the USA and outdoor shelter installations in Canada see Section 3 3 2 Vent collars are available from any Jandy distributor 2 Primer and cement suitable for c...

Page 6: ...am showing the heater s exterior dimensions and dimensions to critical connec tions on the heater Figure1 GeneralConfiguration Values shown are for both LX and LT models Heater Width Model Dim A Heate...

Page 7: ...Check the rating plate on the heater or the Parts List Section 11 2 of this manual for the correct Jandy vent collar part number For specific installation information see Section 2 3 5 Indoor and Out...

Page 8: ...4 inches 102 millimeters mm thick covered with sheet metal at least 24 gauge thick and extending beyond the full width and depth of the heater by at least 6 inches 153 mm in all directions The masonr...

Page 9: ...us la saillie doit tre ouverte sur 3 c t s If the heater is installed close to a structure protect it from rain water runoff with rain gutters on the roof or other measures Do not locate the heater ne...

Page 10: ...t collar The collar will accommodate vent piping of nominal 7 or 9 diameter see Table 4 depending upon the model of your heater See Figure 7 See vent installationsectionforimportantinformationon selec...

Page 11: ...2 cm2 in2 cm2 250 L 63 406 126 813 400 L 100 645 200 1290 Area indicated is for one of two openings one at floor level and one at the ceiling so the total net free area would be double the figures ind...

Page 12: ...r Shelter Installations All indoor installations and outdoor shelter installations require the addition of a factory approved vent collar The vent collar must be installed without modification All ven...

Page 13: ...scines et cuves thermales sont con us pour tre utilis s avec du gaz naturel ou du gaz de p trole liqu fi GPL V rifiez l information inscrite sur la plaque signal tique du panneau int rieur pour vous a...

Page 14: ...ecting a manometer to the pressure port on the outlet side of the valve The pressure will be zero when the heater is not running When the heater is operating the manifold gas pressure should be 3 0 WC...

Page 15: ...operation of the switch In Figure10 TypicalPipingInstallation general the pressure switch can be adjusted to accommodate this effect if the heater water connec tions are no more than six feet below t...

Page 16: ...ls are generally done before the installation of power and water to the heater If you need to reverse the heat exchanger on a previously installed heater be sure that all electrical power the gas supp...

Page 17: ...ader s mating surface of any corrosion or debris Do not use any metal tools on the header surface Scratches may compromise the seal integrity 20 Place the inlet outlet header over the gasket on the le...

Page 18: ...gas line will enter the heater 37 Use the button plug to cover the hole on the opposite side of the heater NOTE Be sure that the white fiber gasket is positioned on the top flange of the exhaust vent...

Page 19: ...ill bit 4 Open the hole again by reaming it with a 1 2 inch drillbit CAUTION Initially drilling a 1 2 hole without reaming may cause the bit to grab on the plastic This may cause personal injury or da...

Page 20: ...nstream of the heater and install an in line check valve between the heater and the feeder a minimum of 18 is required between the heater and the check valve Wire any electrical chemical feeder so tha...

Page 21: ...LX and LT Low NOx Pool Spa Heater Page 19 Figure 18 LX and LT Low NOx Connections Schematic Wiring Diagram...

Page 22: ...access to the leads See Fig 19 NOTE No external junction box is required 6 2 1 Converting the Heater for a 115V Power Source To convert the LX and LT Low NOx heaters to 115 Volt 60 Hz AC requires reve...

Page 23: ...rom purging the residual heat from the heater when the heater turns off This situation will damage the heater The blower must be allowed to run for 45 seconds after the heater shuts off 6 5 Remote Ope...

Page 24: ...er is first powered the display on the control will show RS ONLINE If there is an RS control connected to the heater it will sense the RS unit and remain online If an RS system is not connected to the...

Page 25: ...ttings or a variety of other demands that might be encountered The heater has an internal safety system which allows operation in a variety of conditions and prevents operation when certain adverse co...

Page 26: ...rn the pump off 23 hours after the start time e g If the start time is 2 00 PM then set the stop time at 1 00 PM This lets the filter system and heater operate continuously until the water reaches the...

Page 27: ...ahrenheit Celsius temperature unit indicator The Model LT does not offer these features 7 3 2 Turning the Heater On or Off When power is supplied to the Model LX heater the control goes into a diagnos...

Page 28: ...mentarily lost the thermostat settings will remain the same Also note that the heater should not be used to maintain water temperatures at or below 70 F 21 C This will damage the heater 7 4 Lighting a...

Page 29: ...ckwise to ON 9 Replace control access panel A This appliance does not have a pilot light It is equipped with an ignition device which automatically lights the heater Do NOT try to light the burners by...

Page 30: ...will increase back pressure enough for the heater to operate properly Make sure the pool filter is clean before making any pressure switch adjustment A dirty filter will restrict the water flow and t...

Page 31: ...el to the Off position 3 Start the filter pump 4 After three minutes note and record the ther mometer reading This is the pool water tempera ture 5 Start the heater by setting the control panel to eit...

Page 32: ...50 ppm Total Dissolved Solids TDS Less than 2000 ppm Copper 0 ppm Concentration levels taken from Basic Pool and Spa Technology published by NSPI National Spa and Pool Institute 8 2 Seasonal Care CAUT...

Page 33: ...age or death WARNING Improper installation or maintenance can cause nausea or asphyxiation from carbon monoxide in flue gases which could result in severe injury or death AVERTISSEMENT Une installatio...

Page 34: ...face away from the burner area opening to prevent any risk of personal injury ATTENTION Pour votre s curit personnelle lorsque vous mettez l appareil en marche tenez votre t te et votre visage loin du...

Page 35: ...e ignition controller in both the LX and LT Low NOx model heaters has an LED light that flashes to indicate various different faults Table 9 lists the LED codes and the corresponding fault description...

Page 36: ...0 3 chamber pressure draft B2 Decrease draft openings by sliding damper beneath burners see Section 10 3 C Rich fuel air mixture C Decrease draft openings by sliding damper High gas heat content benea...

Page 37: ...efer to qualified service personnel AIR FLO SW air flow switch 1 Broken split pinched or disconnected fan switch tubing 1 Check tubing and replace if necessary 2 Fan not operating 2 Correct fault or r...

Page 38: ...quat peut entra ner des blessures corporelles ou des dommages la propri t Pour cette raison l appareil de chauffage doit tre entretenu et r par uniquement par un technicien professionnel qualifi 10 1...

Page 39: ...lving burner heat exchanger or flue collector removal must be conducted with this in mind 10 3 2 Field Service and Adjustment As with all gas fired appliances the first order of business is to verify...

Page 40: ...it switches prevent excessive water temperature one within the heat exchanger and one for water leaving the heater If either senses excessive temperature burner operation is interrupted 6 Water Pressu...

Page 41: ...igure 39 The voltages measured between any two of these four points will be determined by the voltage supplied to the transformer see Table 13 for expected voltages If the voltages measured do not fal...

Page 42: ...s that the wire harness between the controller and the water pressure switch is good If there is no voltage at test point 7 look for a loose connection or replace the ten pin wire harness If there is...

Page 43: ...s is detected at this point the devices in this circuit are closed and the circuit is workingproperly If there is no voltage either the fusible link or the contacts of the manual reset switch are open...

Page 44: ...est point 28 during the trial for ignition There should an audible click when the valve opens If there is voltage at test point 28 but the gas valve does not open replace the valve 10 5 3 8 Igniter Ig...

Page 45: ...that the power distribution circuit board has shorted and needs to be replaced If the voltage is correct move the red lead to the connection at the igniter wire quick disconnect test point H No volta...

Page 46: ...Page 44 Figure 39 Test Point Identification Diagram...

Page 47: ...LX and LT Low NOx Pool Spa Heater Page 45...

Page 48: ...rrect voltage is measured at this point move the red meter lead to the igniter wire quick disconnect test point I No voltage here during the trial for ignition means that the wire between the power di...

Page 49: ...essure Switch 2 psi All R0013200 36 Siphon Loop All R0334600 Key Model Order No Description No Part No Electrical Continued 37 High Limits Set All R0023200 38 HighLimit135 F All R0022700 39 High Limit...

Page 50: ...NEXT PAGE FOR DETAILS 5 SEE NEXT PAGE FOR DETAILS 8 9 14 SEE NEXT PAGE FOR DETAILS 18 19 20 21 43 34 35 36 69 53 51 22 23 52 70 67 56 55 60 62 64 61 59 58 66 65 63 60 68 71 57 28 37 SEE NEXT PAGE FOR...

Page 51: ...LX and LT Low NOx Pool Spa Heater Page 49 11 4 Detailed Exploded View 33 25 27 35 49 50 42 17 15 16 32 31 28 30 29 10 11 3 2 11 12 38 41 40 41 39 4 75 6 7 5...

Page 52: ...Use of non factory authorized parts or accessories in conjunction with the product s 8 Chemical contamination of combustion air or improper use of sanitizing chemicals such as introducing sanitizing c...

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