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WARNING

If the information in this manual is not 

followed exactly, a fire or explosion may 

result causing property damage, personal 

injury or loss of life.

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 installer, service agency, or gas 

supplier.

AVERTISSEMENT

Assurez-vous de bien suivres les instructions 

données dans cette notice pour réduire au 

minimum le risque d’incendie ou d’explosion 

ou pour éviter tout dommage matériel, toute 

blessure ou la mort.

Ne pas entreposer ni utiliser d’essence ni 

d’autres vapeurs ou liquides inflammables dans 

le voisinage de cet appareil ou de tout autre 

appareil.

QUE FAIRE SI VOUS SENTEZ UNE ODEUR DE GAZ:

•  Ne pas tenter d’allumer d’appareils.

•  Ne touchez à aucun interrupteur. Ne pas vous 

servir des téléphones dansle bâtiment où vous 

vous trouvez.

•  Appelez immédiatement votre fournisseur de 

gaz depuis un voisin. Suivez les instructions 

du fournisseur.

•  Si vous ne pouvez rejoindre le fournisseur de 

gaz, appelez le sservice des incendies.

L’installation et l’entretien doivent être assurés par 

un installateur ou un service d’entretien qualifié ou 

par le fournisseur de gaz.

Installation and Operation Instructions 

Document 3006V

H0067300V

FOR YOUR SAFETY:

 This product must be installed and serviced by a professional service technician, 

qualified in hot water boiler installation and maintenance. Improper installation and/or operation could 

create carbon monoxide gas in flue gases which could cause serious injury, property damage, or death. 

Improper installation and/or operation will void the warranty. For indoor installations, as an additional 

measure of safety, Laars strongly recommends installation of suitable Carbon Monoxide detectors in the 

vicinity of this appliance and in any adjacent occupied spaces.

These instructions are to be stored in  

the pocket provided on the heater.

OUTDOOR

INDOOR

Model AP

Sizes 500-1825

Installation and Operation
Instructions for

MIGHTYTHERM

®

Summary of Contents for Mighty Therm AP

Page 1: ...pas tenter d allumer d appareils Ne touchez aucun interrupteur Ne pas vous servir des t l phones dansle b timent o vous vous trouvez Appelez imm diatement votre fournisseur de gaz depuis un voisin Su...

Page 2: ...or Pool Heaters 7 2 4 Gas Supply and Piping 7 2 5 Electrical Wiring 8 2 6 General Piping Instructions 9 2 7 Heater By Pass Piping 9 2 8 Temperature Sensor Placement and Installation 10 2 9 Automatic C...

Page 3: ...N HEAT EXCHANGER C GLASS LINED COPPER N GLASS LINED CU NI A GLASS LINED COPR REVRSD M GLASS LINED CU NI REVRSD Option Code XX Standard JX CSD 1 HL High low gas pressure switches LC LWCO 100 lockout LW...

Page 4: ...of ANSI standard Z223 1 and any local codes that may be applicable Inadequate combustion air supply may result in incomplete combustion sooting of the heat exchanger and unsafe operation of the heate...

Page 5: ...and must not be connected to any portion of a mechanical draft system under positive pressure The flue outlet must be connected to a clear unobstructed vent of adequate capacity ending above the high...

Page 6: ...ing system are located and the other spaces of the building Turn on any clothes dryer and any appliance not connected to the common venting system Turn on any exhaust fans including range hoods and ba...

Page 7: ...or wall recess Avoid locations where wind deflection off structures might cause downdraft When such wind conditions are possible place the heater at least 3 feet 0 9m from the structures 3 Never insta...

Page 8: ...cifically ordered otherwise 2 The 1825 models are supplied with 3 4 HP pump motors All other models are supplied with 1 2 HP pump motors Consult the National Electrical Code or the Canadian Electrical...

Page 9: ...ilter system are made of plastic materials they may be damaged by the momentary back siphoning of hot water from the heater when the filter pump stops running The pressure relief valve installed in th...

Page 10: ...Controls a Intermittent Ignition Pilots are automatically lit when the operating control calls for heat Systems 4 9 and 11 The unit performs its own safety check and opens the main valves only after...

Page 11: ...e auto reset limit switch is provided as standard equipment on all heaters The temperature sensing bulb of the switch is field installed and should be located in the pool loop piping See Section 2 8 f...

Page 12: ...auses air to be drawn into the heater and the secondary piping an automatic float type air vent should be permanently installed on top of the pump scroll 3 To check the heater firing proceed as follow...

Page 13: ...pen throttle turn down outlet valve B slightly Observe the inlet thermometer for 5 minutes to see where the inlet temperature stabilizes If it remains under 110 F 43 C throttle outlet valve B a little...

Page 14: ...caution is suggested for young children adjusted incrementally to obtain the desired pool operating temperature 7 An adjustable pump time delay relay is mounted in the control panel see Figure 11 Thi...

Page 15: ...30 days 90 days and once every six months thereafter Fouling on the external surfaces of the heat exchanger is caused by incomplete combustion and is a sign of combustion air and or venting problems...

Page 16: ...operating condition and preventing corrosion liming or other problems Proper pool water chemistry includes other values that must be maintained for swimmer safety Refer to your local agency having jur...

Page 17: ...r u s s e r p m o r f y r a s s e c e n s a t s u j d a F Electric gas valve operator is F Disconnect wiring harness at gas valve terminals Check continuity of actuator burned out or shorted coil If o...

Page 18: ...303 10548301 14 Tile Heat Shield Spacer Rear 10548401 10548402 10548403 10548404 15 Saddle Assembly End Tile 10533600 10533600 10533600 10533600 10533600 10533600 10533600 10533600 10533600 2 2 2 2 2...

Page 19: ...Page 19 Figure 17 Parts Identification Mighty Therm Commercial Pool Heating Boiler Page 19 Figure 17 Parts Identi cation ONE PIECE PUMP VOLUTE MightyTherm Pool Heater...

Page 20: ...n Combustible Base Rail 10539000 10539000 10539000 10539000 10539000 10539000 10539000 10539000 10539000 2 2 2 2 2 2 2 2 2 Water System 34 8 Tube Assembly Copper Tubes 10534701 10534702 10534703 10534...

Page 21: ...101 2 2 2 2 2 2 2 2 2 42 Flange Gasket S0063700 S0063700 S0063700 S0063700 S0063700 S0063700 S0063700 S0063700 S0063700 2 2 2 2 2 2 2 2 2 43 Header Gasket w Barrier S0095100 S0095100 S0095100 S0095100...

Page 22: ...00 58 Pilot Bracket Burner Weldment 10529502 10529502 10529502 10529502 10529502 10529502 10529502 10529502 10529502 59 Pilot Burner W0035800 W0035800 W0035800 W0035800 W0035800 W0035800 W0035800 W003...

Page 23: ...Control Electronic E2305400 E2305400 E2305400 E2305400 E2305400 E2305400 E2305400 E2305400 E2305400 Single Try 72 Transformer 115V 24V R0021300 R0021300 R0021300 R0021300 R0021300 R0021300 R0021300 R0...

Page 24: ...ssemblies When ordering tiles Assembly number is for all tiles Part numbers shown for the front of unit are the same for the rear tiles Check dimensions of old tile as shown here to confirm part numbe...

Page 25: ...Page 25 Figure 19 Outdoor Parts 1 2 3 4 5 6 7 8 9 10 11 12 14 15 16 17 18 19 13 20 MightyTherm Pool Heater...

Page 26: ...10665907 10665908 10665909 Copper Tube Cast Iron Tubs Outdoor 10 Tube Assembly 20001101 20001102 20001103 20001104 20001105 20001106 20001107 20001108 20001109 Copper Tube Bronze Tubs Outdoor 10 Tube...

Page 27: ...Front End Panel 10657501 10657501 10657501 10657501 10657501 10657501 10657501 10657501 10657501 13 Right Front End Panel 10657502 10657502 10657502 10657502 10657502 10657502 10657502 10657502 10657...

Page 28: ...905 636 0666 www Laars com Litho in U S A Laars Heating Systems 21 10 Document 3006V Laars Heating Systems Company reserves the right to change specifications components features or to discontinue pro...

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