Mighty Therm AP, AP0500, AP0600, AP0715, AP0850 Installation And Operation Instructions Manual

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Installation and Operation Instructions Document 3006R

Installation and Operation Instructions for

Mighty Therm

Pool Heating Boiler

Model AP

Sizes 500 - 1825

These instructions are to be stored in the

pocket provided on the heater.

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.

If the information in this manual is not

WARNING

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.

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.

AVERTISSEMENT

H0067300R

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LAARS HEATING SYSTEMS

TABLE OF CONTENTS

SECTION 1. General Information

1.1 Introduction ................................................... 3

1.2 Heater Identification ...................................... 3

1.3 Primary/Secondary Pump and Piping ........... 3

1.4 Certifications ................................................. 3

1.5 Engineering Assistance ................................ 3

SECTION 2. Installation

2.1 Boiler Placement .......................................... 4

2.2 Installation of Indoor Boilers.......................... 4

2.2.1 Combustion Air Supply ................................. 4

2.2.2 Venting ......................................................... 5

2.2.3 Common Venting System

Test Procedure ............................................. 6

2.2.3 Instructions Relatives au Test des

Systèmes à Évent Commun ......................... 6

2.3 Installation of Outdoor Boilers ....................... 7

2.4 Gas Supply and Piping ................................. 7

2.5 Electrical Wiring............................................ 8

2.6 General Piping Instructions ...........................9

2.7 Boiler By-Pass Piping ................................... 9

2.8 Temperature Sensor Placement

and Installation ............................................ 10

2.9 Automatic Chlorinators ............................... 10

SECTION 3. Operation

3.1 Controls - General ...................................... 11

3.2 Initial Start-Up ............................................. 12

3.3 Safety Shutoff Component Checkout.......... 12

3.4 Inlet Temperature and

Temperature Rise Adjustment .................... 13

3.5 Heater Shut Down ...................................... 13

3.6 Spring and Fall Operation

Stand-by Service ........................................ 13

3.7 Winter Operation Complete Shutdown ....... 14

3.8 Time Clock Operation ................................. 14

3.9 Therapeutic Pools (Spas) ........................... 14

SECTION 4.

Maintenance..............................................15

SECTION 5.

Troubleshooting .......................................16

SECTION 6.

Parts Description and Order Numbers ........ 18

Mighty Therm Commercial Pool Heating Boiler

Page 3

SECTION 1. General Information

1.1 Introduction

This manual provides information for the installation and operation of Laars Model AP pool heating boilers. It is strongly recommended that all application and installation procedures be reviewed completely before proceeding with the installation. Consult the Laars factory, or local factory representative, with any problems or questions regarding this equipment. Experience has shown that most problems are caused by improper installation, not system design.

Some accessory items are shipped in separate packages. Verify receipt of all packages listed on the packing slip. Inspect everything for possible damage upon delivery, and inform the carrier of any shortages or impairments. Any such claims should be filed with the carrier. The carrier, not the shipper, is responsible for shortages and damage to the shipment whether visible or concealed.

WARNING

The model AP commercial pool heating boiler must be used on potable water only. For heating pools containing salt water, a specially equipped heater must be used; consult your distributor or factory representative. The pool heating boiler must be installed in accordance with the procedures outlined in this manual.

The warranty does not apply to heaters not installed or operated in accordance with these procedures. Consult local building and safety codes before proceeding with work. The installation must conform to the requirements of the authority having jurisdiction or, in the absence of such requirements, to the latest edition of the National Fuel Gas Code; ANSI Z223.1, National Electrical Code ANSI/NFPA

70. In Canada, the installation must conform with the latest edition of CAN/CGA-B149 requirements.

When required by the authority having jurisdiction, the installation must conform to

American Society of Mechanical Engineers safety codes for controls and safety devices for automatically fired heaters No. CSD-1, and in Canada CGA 3.3. Any modification of the heater, its gas controls, gas orifices, wiring or drafter diverter may void the Laars warranty. If field conditions require such modifications, consult factory.

1.2 Heater Identification

Consult rating plate on the heating boiler. Shown below is a breakdown of the model nomenclature. Laars commercial pool heating boilers are available in two configurations: an indoor version and an outdoor version. Outdoor models are not available in Canada.

1.3 Primary/Secondary Pump and Piping

All models are supplied with integrally mounted pumps. The 1825 models use a 3/4 HP pump and all other models are supplied with 1/2 HP pumps. These pumps are sized for the pressure drop through the heat exchanger and through the bypass piping as shown in Figure 10.

Any deviations from the arrangement shown may increase the head on the pump, reduce flow and hinder performance (see Section 2.7). For spas see Section 3.9.

This piping arrangement and the integral pump allow hot water to be recirculated to the heater inlet, thus raising the inlet temperature and greatly reducing condensation.

1.4 Certifications

All models are design-certified by AGA and CGA for natural or propane gas and conform to ASME Code requirement for 160 PSI water pressure.

1.5 Engineering Assistance

Consult the factory or distributor regarding any questions or problems which arise in the specification, installation or operation of Laars equipment. An experienced engineering staff is ready to assist in assuring the proper performance and application of Laars products.

1 2 3 4 5 6 7 8 9 10 11 12 13 14

MODEL

AP-POOL

Figure 1. Heater Identification (model nomenclature).

SIZE

BTU/HR X 1000

0500 0600 0715 0850 0999 1010 1200 1430 1670 1825

I-INDOOR E-OUTDOOR

FUEL

N-NATURAL P-PROPANE

IGNITION

04-SPARK 110V 09-SPARK 24V 11-SPARK 24V 16-STND. PILOT

FIRING MODE ON/OFF

VERSION

1 - 8 TUBE B-10 TUBE

HEAT EXCHANGER

C-GLASS LINED/COPPER N-GLASS LINES/CU-NI K-BRONZE/COPPER S-BRONZE/CU-NI

REVISION

P-PUMP (U.S.) Q-PUMP (CAN)

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LAARS HEATING SYSTEMS

SECTION 2. Installation

2.1 Boiler Placement

The pool heating boiler must be placed to provide specific clearances on all sides for maintenance and inspections. There must also be minimum distances maintained from combustible surfaces. These clearances also apply to noncombustible materials because the pool heating boiler requires air circulation for proper operation.

The pool heating boiler should be mounted on a level surface. An integral base for an installation on combustible flooring is provided as standard equipment on special base rails part number 10539000 must be used for combustible flooring.

Do not install a pool heating boiler on carpeting.

Under the national Fuel Gas Code, ANSI Z223.1, it is permissible to place the boiler on floors other than noncombustible when the installation complies with the American Insurance Code. Figures 2, 3, 4 and 5 show common installation on combustible flooring.

outdoor models. For indoor models,

Clearance Indoor Outdoor

from in. mm in. mm

Top 30 762 unobstructed

Water Conn. side 12* 305 24 610

Pump side 6* 152 24 610

Front Alcove* unobstructed

Rear 8 203 24 610

Vent pipe** 6 152 - - -

Hot water pipes per code per code

* Water connection and pump side clearances of 24" (610mm)

and front clearances of 48" (1219mm) will allow easier service access.

** Using type B vent (refer to Manufacturer's Instructions).

Table 1. Minimum boiler clearances from

adjacent surfaces.

2.2 Installation of Indoor Boilers

Locate the pool heating boiler to provide adequate clearance for inspection and service on all sides. See Table 1. For alcove installation, see Figure 6.

Install indoor heaters on a waterproof floor with an adequate floor drain and a 6" (152mm) minimum curb on all four sides to protect the building if heater repairs are required. The manufacturer will not be

held liable for any water damage in connection with this boiler.

2.2.1 Combustion Air Supply

The heater location must provide sufficient air supply for proper combustion and ventilation of the surrounding area as outlined in the latest edition 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 boiler.

a. Conventional Ventilation

In the United States, these requirements specify that small boiler rooms should be provided with two permanent air supply openings communicating directly through the wall to outside air one within 12 inches (305mm) of the ceiling, and the other within 12 inches (305mm) of the floor. Each opening should have a minimum free area of one square inch (6.5 sq. cm) per 4,000 BTU/hr input of the total input rating of all appliances in the enclosed area. See Table 2 for recommended air supply for each model. An improperly ventilated equipment room can get

Figure 2. Typical Boiler Installation on Concrete Slab.

Figure 3. Typical Boiler Installation on Roof Using

Raised Platform (wood).

excessively hot and cause accelerated deterioration of controls and electrical components.

In Canada, Table 2 does not apply. Consult local building codes or, in the absence of such requirements, follow CGA requirements and/or CAN/ CGA B-149 standard.

Mighty Therm Commercial Pool Heating Boiler

12345678901234567890

Page 5

Figure 4. Typical Boiler Installation on Roof

Using 4x4 Stringer.

Base must extend out min. 12" (305mm) on all sides of heater frame.

20 ga. min. galvanized sheet metal under entire heater.

234567890123456789

CLOSET INSTALLATION

(UNACCEPTABLE)

A closet is any 4 sided enclosure which is less than 16* times the total volume of all the gas fired appliances within the enclosure.

234567890123456789

Water

Heater

234567890123456789

Water

Heater

ROOM INSTALLATION

(ACCEPTABLE)

A room is any enclosure which is at least 16* times greater than the total volume of all the gas fired appliances within the enclosure.

ALCOVE INSTALLATION

(ACCEPTABLE)

An alcove suitable for the installation of a water heater is a restricted section of a room not separated from the room by a door or partition and which meets the minimum clearances for the specific model water heater listed below.

* When the ceiling height exceeds 8 feet, you are only allowed to consider 8 feet when calculating the total volume of the enclosure.

Figure 6. Alcove Installation.

Concrete blocks or tile min. 7" (178mm) high with 3" (76mm) min. air openings.

Blocks must provide solid base and be braced so they cannot slip out of place. Air openings in blocks must be arranged to provide unobstructed opening through entire width or length of base.

Figure 5. Installation on Concrete Blocks or Tile.

b. Forced-Air Ventilation

In the United States: any equipment which exhausts air from the boiler room can deplete the combustion air supply or reverse the natural draft action of the venting system. This could cause flue products to accumulate in the boiler room. Additional air must be supplied to compensate for such exhaust. The information in Table 2 is not applicable in installations where exhaust fans or blowers of any type are used. Such installations must be designed by qualified engineers.

In Canada: follow Canadian standard, CAN/ CGA B-149 or local codes.

If a blower or fan is used to supply air to the boiler room, the installer should make sure it does not create drafts which could cause nuisance shutdowns of the pilot. If a blower is necessary to provide adequate combustion air to the boiler, a suitable

switch or interlock must be wired into the heater control circuit to prevent the heater from firing unless the blower is operating.

protected from any source of corrosive chemical fumes such as trichlorethylene, perchloroethylene, chlorine, etc.

The boiler must be completely isolated and

2.2.2 Venting

Laars boilers have built-in draft diverters for natural draft operation 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 highest point of the building with an approved vent cap. The venting system should be installed according to the latest edition of ANSI Z223.1 and/or, in Canada, CAN/CGA B-149 and any local codes having jurisdiction.

Do not weld or fasten the vent pipe to the boiler drafthood. The weight of the stack must not rest on the boiler.

The drafthood and boiler top must be easily

removable for normal boiler service and inspection.

IMPORTANT NOTE: Do not use sheet metal screws at the snap lock joints of Type B gas vents.

Avoid using long horizontal runs of the vent pipe, and too many 90° elbows, reductions or restrictions. Horizontal runs should have at least a 1/4" (6mm) rise per foot in the direction of flow. A vent connector should be supported for the design and weight of the material used to maintain clearances and prevent physical damage and separation of joints.

Avoid terminating boiler vents near air conditioning or air supply fans. The fans can pick up exhausted flue products from the boiler and return them inside the building creating a possible health hazard. A minimum of 4 feet (1.2m), in Canada 6 feet (1.8m), horizontal distance must be maintained from electrical meters, gas meters, and relief equipment.

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LAARS HEATING SYSTEMS

Always use double-wall or insulated vent pipe (Type B or equivalent). In cold weather, uninsulated outside vents can chill the rising flue products blocking the natural draft action of the venting systems. This can create a health hazard by spilling flue products in the boiler room.

Avoid oversized vent piping or extremely long runs of pipe which may cause excessive cooling and condensation. Rule of Thumb: the total length of the vent, including the connector and any offset, should not exceed 15 feet (4.6m) for every inch (25mm) of vent diameter. Longer total lengths shown in venting tables are based on maximum capacity, not condensation factors.

When the installation of a draft fan is necessary in connecting a venting system to a Laars boiler, the installation should be engineered by competent personnel following good engineering practices. The draft fan supplier should be consulted for correct size. The installation should be in accordance with the latest edition of ANSI Z223.1 and/or, in Canada, CAN/CGA B-149 and any local codes having jurisdiction. When a draft fan is installed, a suitable draft switch must be wired into the boiler control circuit at terminal designated "Field Interlock" to prevent firing of the boiler unless a positive draft has been established.

2.2.3 Common Venting System

Test Procedure

At the time of the removal of an existing heater, the following steps shall be followed with each appliance remaining connected to the common venting system. During the testing of each unit, the other appliances remaining connected to the common venting system should not be operated.

1. Seal any unused openings in the common

venting system.

2. Visually inspect the venting system for proper

size and horizontal pitch. Determine that there is

no blockage or restriction, leakage, corrosion, or

other deficiencies which could cause an unsafe

condition.

3. Insofar as it is practical, close all building doors

and windows. Also close all doors between the

space in which the appliances remaining

connected to the common venting 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

bathroom exhausts, so they will operate at

maximum speed. Do not operate a summer

exhaust fan. Close all fireplace dampers.

4. Place in operation the appliance being inspected.

Follow the lighting instructions for the unit.

Adjust the thermostat so the appliance will

operate continuously.

5. Test for spillage at the draft hood relief opening after 5 minutes of main burner operation. Use the flame of a match or candle, or smoke from a cigarette, cigar, or pipe.

6. After it has been determined that each appliance remaining connected to the common venting system properly vents when tested as outlined above, return doors, windows, exhaust fans, fireplace dampers and any other gas-burning appliance to their previous condition of use.

7. Any improper operation of the common venting system should be corrected so the installation conforms with the National Fuel Gas Code,

ANSI Z223.1 and/or CAN/CGA B149, Installation Codes. When resizing any portion of

the common venting system, the common venting system should be resized to approach the minimum size as determined using the appropriate tables in Appendix G in the National

Fuel Gas Code, ANSI Z223.1 and/or CAN/CGA B149 Installation Codes.

2.2.3 Instructions Relatives au Test des Systèmes à Évent Commun

Au moment du restrait d’une chaudière

existante, les mesures suivantes doivent être prises pour chaque appareil toujours reccordé au système d’évacuation ne fonctionnet pas:

1. Sceller toutes les ouvertures non utilisées du systèmes d’évacuation.

2. Inspecter de façon visuelle le système d’évacuation pour déterminer la grosseur et l’inclinaison horizontale qui conviennent et s’assurer que le système est exempt d’obstruction, d’étranglement, de fuite, de corrosion et autres défaillances qui pourraient présenter des risques.

3. Dans la mesure du possible, fermer toutes les portes et les fenêtres du bâtiment et toutes les portes entre l’espace où les appareils toujours raccordés au système d’évacuation sont installés et les autres espaces du bâtiment. Mettre en marche les sécheuses, tous les appareils non raccordés au système d’évacuation common et tous les ventilateurs d’extraction comme les hottes de cuisinière et les ventilateurs des salles de bain. S’assurer que ces ventilateurs fonctionnent à la vitesse maximale. Ne pas faire fonctionner les ventilateurs d’été. Fermer les registres des cheminées.

4. Mettre l’appareil inspecté en marche. Suivre les instructions d’allumage. Régler le thermostat de façon que l’appareil fonctionne de façon continue.

5. Faire fonctionner le brûleur principal pendant 5 min ensuite, déterminer si le coupe-tirage déborde à louverture de décharge. Utiliser la

Mighty Therm Commercial Pool Heating Boiler

Page 7

flamme d’une chandelle ou la fumée d’une cigarette, d’une cigare ou d’une pipe.

6. Une fois qu’il a été déterminé, selon la méthode indiquée ci-dessus, que chaque appareil raccordé au systéme d’évacuation est mis à l’air libre de façon adéquate. Remettre les portes et les fenêtres, les ventilateurs, les registres de cheminées et les appareils au gaz à leur position originale.

7. Tout mauvais fonctionnement du systéme d’évacuation commun devrait être corrigé de façon que l’installation soit conforme au National Fuel Gas Code, ANSI.Z223.1 et (ou) aux codes d’installation CAN/CGA-B149. Si la grosseur d’une section du système d’évacuation doit être modifiée, le système devrait être modifié pour respecter les valeurs minimales des tableaux pertinents de l’appendice G du National

Fuel Gas Code, ANSI Z2231.1 et (ou) des codes d’installation CAN/CGA-B149.

2.3 Installation of Outdoor Boilers

(Not available in Canada)

1. Locate the boiler to provide the clearances as listed in Table 1, “Minimum Boiler Clearances.”

2. Do not place the boiler in an enclosure 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 install the boiler under any kind of roof overhang. Do not place the boiler below or adjacent to any doors, windows, louvers, grills, etc., which connect in any way with an inhabited area of a building. This includes other structures such as garages or utility rooms (see Figure 7).

4. Although these models are CSA designed certified for outdoor installations, such installations are not recommended in areas where the danger of freezing exists unless proper precautions are taken for freeze protection.

Outdoor installations are not recommended in

areas where the danger of snow blockage exists.

WARNING

Liquefied petroleum gas is heavier than air. Therefore, the pool heating boiler should not be installed in pits or other locations where gas could accumulate.

The boiler should be located a safe distance from

Propane gas storage and filling equipment. Consult local codes and fire protection authorities for advice on specific installation restrictions.

Boiler Each Opening*

Size square inches square cm

500 125 806.5 600 150 967.8 715 179 1154.9

850 213 1374.3 1010 253 1632.4 1200 300 1935.6 1430 358 2309.8 1670 418 2696.9 1825 457 2948.6

* Net Free Area. 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.

Area indicated is for one of two openings: one at floor level and one at the ceiling, so the total net free area could be double the figures indicated. For special conditions refer to the latest editon of ANSI Z223.1.

Consult factory if openings do not communicate directly through the walls with the outdoors.

Table 2. Minimum Recommended Air Supply to Boiler.

Figure 7. Incorrect Outdoor Installation.

2.4 Gas Supply and Piping

Review the following instructions before

proceeding with the installation.

1. Verify that the boiler is fitted for the proper type of gas by checking the rating plate. Laars boilers are normally equipped to operate below a 2000 foot (609.6m) altitude. Boilers equipped to operate at higher altitudes have appropriate stickers or tags attached, also printed information on rating plate.

2. Use the figures in Table 3 to provide adequate gas piping from the gas meter to the boiler.

3. A sediment trap (drip leg) must be provided ahead of the gas controls (see Figure 8). A manual gas shutoff valve must also be provided for service convenience and safety. Check the local codes.

Page 8

LAARS HEATING SYSTEMS

Distance from Gas Meter

Boiler or Last Stage Regulator

Size

500 1½" 2" 2" 600 1½" 2" 2½" 715 2" 2" 2½"

850 2" 2½" 2½" 1010 2" 2½" 3" 1200 2½" 3" 3" 1430 2½" 3" 3" 1670 2½" 3" 3 1825 2½" 3" 3½"

NOTE: These figures are for Natural Gas (.65 Sp. Gr.), and are based on 1/2" water column pressure drop. Check supply pressure with a manometer, and local code requirements for variations. For Propane Gas, reduce pipe diamter one size. An average number of tees and elbows have been taken into account.

0-100' 100-200' 200-300'

0-30.5m 30.5-61m 61-91.4m

Table 3. Gas Piping Sizes.

4. The boiler and its individual shutoff valve must be disconnected from the gas supply piping system during any pressure testing of that system at test pressures in excess of 1/2 psig (3.5kPa). The boiler must be isolated from the gas supply piping system by closing its individual manual gas shutoff valve during any pressure testing of the piping system at test pressures equal to or less than 1/2 psig (3.5kPa).

5. Provide gas supply pressure to the heater as follows:

Natural Gas Propane Gas

In. W.C. kPa In. W.C. kPa

Max. 10 2.5 14 3.4 Min. 6.5 1.6 11 2.7

NOTE: the heater and all other gas appliances sharing the boiler gas supply line must be firing at maximum capacity to properly measure the inlet supply pressure. Low gas pressure could be an indication of an undersized gas meter and /or obstructed gas supply line.

Gas Supply

To Equipment Inlet

Nipple

Inlet

Tee Fitting

3" (76mm) Min.

6. The correct burner manifold gas pressure is stamped on the rating plate. The regulator is preset at the factory and normally requires no further adjustment. The gas manifold and control assembly is

factory tested and conforms to the safe lighting and other performance criteria specified in the latest editions of ANSI Z21.13.CSA4.9 Low Pressure Boiler Standard.

Before operating the boiler, the complete gas

supply system and all connections must be tested for leaks using a soap solution. Do not use raw flame.

Caution

Since some leak test solutions (including soap and water) may cause corrosion or stress cracking, the piping must be rinsed with water after testing, unless it has been determined that the leak test solution is noncorrosive.

2.5 Electrical Wiring

WARNING

The boiler must be electrically grounded in accordance with the most recent edition of the National Electrical Code, ANSI/NFPA 70. In Canada, all electrical wiring to the boiler should be in accordance with the latest edition of CSA C22.1 Canadian Electrical Code, Part 1. Do not rely on the gas or water piping to ground the metal parts of the boiler. Plastic pipe or dielectric unions often isolate the boiler electrically. Service and maintenance personnel who work on or around the heater may be standing on wet floors and could be electrocuted by an ungrounded boiler.

Wiring diagrams are included in the information

packet provided with each unit.

1. All Model AP pool heating boilers need 115V 60Hz supply voltage unless specifically ordered otherwise.

2. The 1825 models are supplied with 3/4 HP pump motors rated at 115/230V, FLA 8.8/4.4. All other models are supplied with 1/2 HP pump motors rated at 115/230V, FLA 5.8/2.9. Consult the National Electrical Code or the Canadian Electrical Code regarding branch circuit requirements for equipment with these motors.

Cap

Figure 8. Sediment Trap Installation.

3. The boilers should be wired exactly as shown in the wiring diagram.

Mighty Therm Commercial Pool Heating Boiler

Figure 9. Pressure Relief Valve Location.

IMPORTANT NOTE: The pool filter pump and

boiler must be electrically interlocked so the boiler cannot come on unless the pump is running and there is full flow in the filter piping where the boiler is connected. If the pool filter pump operation is intermittent the boiler must be shut off prior to pump shutdown. See paragraph heading Auxiliary Time Clock Wiring below. If the backwash operation is manual the boiler must be shut off manually during backwashing.

Auxiliary Time Clock Wiring:

If a time clock is used to control the filter pump operation, a separate switch or relay must be used to shut off the boiler at least

15 minutes before the filter pump is shut off. Wire the switch or relay (often called the Fireman Switch) to the terminals shown in the wiring diagram as “Field Interlock.”

4. All field installed electrical safety devices and

all field installed controllers (valve end switches, draft switches, relays, timers) can be connected to the boiler control to the terminals shown in the wiring diagram designated “Field Interlock.”

5. Field location of the temperature sensor is

described in Section 2.8.

Where the boiler is installed with a draft fan refer to the fan manufacturer's wiring diagram. The draft switch should be wired across the field interlock terminals in the boiler control panel.

Page 9

Since heater outlet temperatures can reach 150°F (66°C) in some cases, copper or CPVC are recommended materials for heater connection piping. PVC material may be used for the inlet valve and the piping upstream of it.

When pipe, fittings, grids or any other element of the filter 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 the tapped opening provided in the outlet header (see Figure 9), must be piped, but not connected, to a drain or floor sink. The drain pipe must be the same size as the valve outlet and must pitch downward from the valve. Where no special setting of the relief valve is ordered, the factory will furnish a 75 psi setting.

The pressure relief valve lever must be tripped at least once a year to insure that waterways are clean. When manually operating lever, water will discharge through the drain line. Precautions must be taken to avoid contact with hot water and water damage.

2.7 Boiler By-Pass Piping

Model 500-1825 boilers do not have an internal bypass valve and MUST BE PIPED AS SHOWN in Figures 10 and 11. For spas see Section 3.9.

All models are supplied with integral pumps, These pumps are sized for the pressure drop through the heat exchanger and through the bypass piping as shown in Figures 10 and 11.

Any deviations from the arrangement shown may reduce flow, hinder performance, and will void the warranty.

2½ inch NPT piping is shown, however, models 500I-1430I and models 500E-1010E may be installed using 2 inch NPT piping.

All models must be installed in the parallel arrangement shown. The "secondary" or boiler piping must tee into the filter piping with the inlet and outlet connection spaced a maximum of 18" (450mm) apart (see Figure 11).

To insure that pool inlet water does not exceed 104°F, the filter pump loop must circulate at the minimum flow rates shown in Table 4.

The outlet valve “A” and the bypass valve “B” must have a provision for locking the handles in place (or removing them) after the temperature rise and inlet temperature adjustments have been made.

2.6 General Piping Instructions

In addition to the bypass valve “B” and outlet valve “A” shown in Figures 10 and 11, an inlet valve “C” should be provided so that the heater can be readily isolated for service. All valves should be butterfly or ball style, application see Section 3.9.

not gate valves. For spas

Boiler Model Minimum Filter Pump Flow Rate

500-850 90 GPM

1010-1200 110 GPM

1430 140 GPM

1670-1825 180 GPM

Table 4. Minimum Flow to Supply Heater Loop.

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LAARS HEATING SYSTEMS

Suggested By-Pass Loop Fitting

Item Description Material

1 2½" Elbow (See Note) 2½" S-80 2 2½" x 2" Reducing

Bushing (See Note) CPVC

3 2½" Tee (All Sizes) Copper is

4 2½" Tee (See Note)

A, B,

2½" Ball Valve (See Note)

C, D

Note: 2" pipe, fittings and valves are optional for indoor size (500 through 1430) and outdoor size (500 through 1010).

optional

Figure 10. Boiler By-Pass Piping.

Figure 11. Heater Piping Arrangement.

2.8 Temperature Sensor Placement and Installation

A temperature sensor with 15 feet (5m) of cable

and an immersion well assembly are supplied with the boiler. These must be installed in the field. Refer to Figures 10 through 12.

1. The immersion well body is provided with a 1/2" NPT. Mount the immersion well on the underside of the filter circulation piping, just upstream of the boiler inlet tee as close to the boiler as possible (see Figure 11). DO NOT

INSTALL in secondary piping or downstream of the boiler inlet tee.

2. Thread the spring and retainer onto the sensor cable and secure sensor into the immersion well.

3. Route cable to heater control panel in a location where it will not be subject to damage. Secure with nylon cable ties.

2.9 Automatic Chlorinators

A concentration of chlorine in the heater can be

very destructive, therefor the following rules about the installation and operation of such devices must be followed:

1. The chlorinator should be installed so it introduces the gas or solution downstream from the boiler.

Mighty Therm Commercial Pool Heating Boiler

Page 11

2. The chlorinator should be wired so it cannot operate unless the filter pump is running.

3. The chlorinator should be provided with an antisiphon device so that the draining of the piping after the pump shuts off will not siphon chlorine solution into the boiler.

4. When the operation of a chlorinator is such that it must be installed in the pump suction, or some other place where the chlorine solution flows through the heater, corrosion of the heater can occur. Excessive concentrations of chlorine caused by improper adjustment or failure of the chlorination equipment cause this corrosion. The resulting damage to the heat exchanger is not covered by heater warranty.

SECTION 3. Operation

3.1 Controls - General (see Figures 12 and 13)

1. Electronic Ignition Controls:

a. Intermittent Ignition:

Pilots are automatically lit when the operating control calls for heat (Systems #4 and #9). The unit performs its own safety check and opens the main valves only after the pilot is proven to be lit. Whenever the

pilot flame is interrupted, the main gas valve closes within 0.8 seconds.

b. Electronically Supervised Standing Pilot

System (System #16):

When pilot flame fails, the ignition control module responds in less than 0.8 seconds and provides 100% safety shutdown.

2. Operating Controls: An electronic temperature control is provided on model AP boilers to control the pool water temperature. The temperature sensor (thermistor) is located in the filter circulation piping (see Section 2.8).

3. Boiler Power (On/Off/Auto) Switch: This provides for constant or automatic pump operation.

4. High Limit Controls: The manual reset high limit switch is provided as standard equipment on all boilers. The temperature sensing bulb of the switch is always located in the heater outlet. Burners will automatically shut down whenever overheating of water occurs.

5. Flow Switch: Standard on all AP pool heating boilers. The switch is mounted in a tee fitting on the outlet header. This is a paddle type switch which is deflected by the water flow in the fitting. Any condition which interrupts or decreases the flow

Water Circulating Pump

Manual Pilot Valve

Manual Main Gas Valve

Safety Gas Valve

Figure 12. Controls Location.

Rating Plate

Operating/Safety Gas Valve

Ignition Control

Flow Switch

Hi-Limit

Out

Pressure Relief Valve

Pump Time Delay Relay

Terminal Strip

Operating Control

Power (On/Off/Auto) Switch

Page 12

LAARS HEATING SYSTEMS

through the secondary loop will shut down the burners.

6. Low Water Cut Off (optional): The low water cut off automatically shuts off boiler whenever water level in the heat exchanger drops below probe level. It is located in the inlet header.

3.2 Initial Start-Up

WARNING

Do not use this appliance if any part has been under water. Immediately call a qualified service technician to inspect the heater. the possible damage to a flooded appliance can be extensive and present numerous safety hazards. Any appliance that has been under water must be replaced.

On a newly constructed pool, be sure to run the

filter pump long enough for a complete “turn-over” of the pool water before starting heater so that dirt and residue from construction will have been removed. The filter may clog rapidly during this period, causing severe cycling of the heater.

then release. Once the pilot is lit, turn power switch to “AUTO PUMP.”

f. Wait 5 minutes and turn up operating

control until heater fires (for intermittent ignition system, the pilot will be ignited automatically). The main burners should ignite smoothly. Turn the operating control back to the lowest setting.

NOTE:

DO NOT OPERATE HEATER UNTIL THE FOLLOWING SAFETY CHECKS HAVE BEEN PERFORMED.

3.3 Safety Shutoff Component Checkout

1. Once the pilot(s) is lit and has been established

for five minutes, the flame failure response time should be checked as follows:

Systems 4 and 9 - (intermittent ignition). With this system pilots are automatically lit when the operating controls call for heat. If the pilot flame fails for any reason, the main valve is shut off within one second and the pilot spark ignition is initiated until the pilot flame has been reestablished. This sequence should be checked by turning off the manual pilot gas valve (see Figure 15), and, at the same time, monitoring the audible sparking at the pilot burner and signal interruption to the main valve.

1. Before placing the heater in operation, be certain that the heater is filled with water and that all air is purged from the system. Open all the valves in the secondary piping.

2. With the filter pump running, run the heater pump in manual “CONSTANT PUMP” for minimum of 10 minutes and listen for the flow switch to make as the pump is started. Loosen the pipe plug on the top of the pump scroll casting to bleed off any air. NOTE: If the system will be operated in a manner that causes 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 follows:

a. Turn off the power switch.

b. Turn off all manual gas valves and wait

five minutes (Figure 14).

c. Set operating control to the lowest setting.

d. After placing the manual pilot gas valve in

the open position and resetting all safety devices (high limit, low water cutoff, etc.), the pilot(s) can be lit following the procedure on the heater rating plate.

e. For standing pilot system, press on pilot

relay knob (see Figure 16), light pilot and keep relay knob depressed for one minute

Caution

Propane gas is heavier than air and sinks to the ground. Exercise extreme care in lighting the heater when so equipped.

System 16 - (electronically supervised standing pilot system). Extinguish the pilot flame by placing the manual pilot valve in the closed positions (see Figure 15), and at the same time, begin recording the time it takes for the output signal from the electronic ignition control to be interrupted. The signal interruption can be detected either with a test light or a voltmeter. The response time should never exceed one second.

2. Hi-Limit Checkout. For spas see Section 3.9. The manual reset high limit is factory preset to 150°F (66°C). Confirm this set point on the unit and adjust if necessary. After running the heater in a firing mode for 10 minutes, slowly close the outlet valve “A” to raise the outlet temperature as indicated on the outlet thermometer. The high limit should trip within 2°F (1°C) or 3°F (2°C) of the 150°F (66°C) setpoint and shut off the burners. If this does not occur, adjust the set point on the unit to shut off the burners when the outlet thermometer reads 150°F (66°C). Open the outlet valve “A” and push the reset button. The main burners should reignite.

Mighty Therm Commercial Pool Heating Boiler

Page 13

3. Flow Switch: See attached vendor literature.

4. Low Water Cutoff (optional): See attached vendor literature.

3.4 Inlet Temperature and Temperature Rise Adjustment

For proper operation the bypass and outlet

valves must be adjusted to obtain the correct heater temperature rise and the correct inlet temperature. Please refer to Table 5 which shows these values for each model. Refer to Section 1.2 and the heater nameplate to determine the model number of your heater. Inlet and outlet thermometers are provided on the unit. For spas see Section 3.9.

1. Make sure that the heater has been firing for at least 10 minutes and that the operating control is set at 5° or 10°F (3° or 6°C) above the pool temperature.

2. Throttling the OUTLET valve “A” will raise the inlet temperature. Throttling both the OUTLET valve and the BYPASS valve “B” will increase the total rise across the heater. Several adjustments will be necessary to obtain BOTH the correct temperature rise and the correct inlet temperature. Wait about 5 minutes between adjustments for the unit to stabilize.

3. After both temperatures have been set, lock the handles on the valves or remove the handles to prevent tampering with or accidental changes to the valve positions.

4. When the pool has reached the desired operating temperature check the temperatures again and adjust if necessary. NOTE: The heater outlet temperature should not exceed 140°F (60°C). Reduce heater temp rise if necessary.

POOL OPERATING CONTROL ADJUSTMENT:

5. Adjustable Differential Feature: Remove the cover from the control box and verify that the white differential potentiometer is set at about 2°F (1°C). NOTE: a 2°F if the thermostat is set at 80°F, the heater will come on at 78°F and go off when the pool reaches 80°F. The 2°F value is a good starting point for most installations. This differential may be adjusted up or down to suit individual applications.

6. The operating control temperature setting can be adjusted incrementally to obtain the desired pool operating temperature.

7. An adjustable pump time delay relay is mounted in the control panel (see Figure 12). This relay keeps the pump running after the burners shut off. The delay should be set to 5-6 minutes for models 500-850 and 9-10 minutes for models 1010-1825.

differential means that,

Manual Reset

High Limit

Part #E21039

Figure 13. Safety Components.

Honeywell

(spark ignition, IID)

Part # W00343 (Nat.)

Part # W20015 (Propane)

Figure 14. Pilot Burners.

Flow

Switch

Part #E131 Indoor

Part #E130 Outdoor

W00365 Thermo-

couple

Part # W00358 (Nat.)

Part # W00344 (Propane)

Low Water

Cutoff

(Optional)

Part #20751

Honeywell

(standing pilot)

3.5 Heater Shut Down

1. If heater is firing, turn operating control to lowest value, wait 10 minutes for pump to stop running, then turn power switch to off.

2. If heater is not firing, turn power switch to off.

3.6 Spring and Fall Operation Stand-by Service

Turn the thermostat down to approximately

70°F (21°C). This will prevent the pool and surrounding ground from becoming chilled and also permit the pool to be raised to swimming temperature in a shorter time.

A pool may be maintained at a lower

temperature than 70°F (21°C) with some increased likelihood of condensation and damage to the unit. Models 500 through 1010 will maintain an inlet temperature of 85°F (29°C) to 90°F (32°C) (if the bypass is properly adjusted) with a pool temperature of 60°F (16°C). Models 1200 and 1430 can maintain the above with a pool temperature of 65°F (18°C). For models 1670 and 1825 pool temperature should be maintained at 70°F (21°C) or above. See item 3 in the next section.

PROCEDURE!

Page 14

Heater Size Heater Temp. Rise Inlet Temp Difference*

Indoor Outdoor (T

500 I 600 E 16°F 9°C 30°F 17°C 600 I 715 E 19°F 11°C 30°F 17°C 715 I 850 E 23°F 13°C 25°F 14°C 850 I 1010 E 26°F 15°C 25°F 14°C

1010 I 30°F 17°C 25°F 14°C 1200 I 1430 E 35°F 20°C 20°F 11°C 1430 I 37°F 21°C 20°F 11°C 1670 I 1670 E 38°F 21°C 20°F 11°C 1825 I 1825 E 38°F 21°C 20°F 11°C

500 E 14°F 8°C 30°F 17°C

1200 E 30°F 17°C 25°F 14°C

ADD this number to pool temperature (T

* temperature (T inlet thermometer should read 95°F (35°C). Field adjustment tolerance +_1°F (.5°C).

). i.e., for 500 E: If pool temperature is 65°F (18°C),

INLET

Table 5. Temperature Settings.

- TIN)(T

OUT

) to get desired inlet

POOL

INLET

- T

POOL

)

3.7 Winter Operation Complete Shutdown

1. To shut down the heater for periods of several months or more, turn manual main gas valve and pilot gas valve to "OFF." Where danger of freezing does not exist, some water should flow through the heater during the normal filter cycle all year long, even when the heater is turned off or shut down completely, if all bypass valves are opened.

2. If the heater is not protected from freezing temperatures, it should be completely drained before the first frost. Drain the heater by removing the drain plug on the bottom of the front header casting. Leave the plug out until ready to use the heater again. Heater must be level to permit adequate draining. When compressed air is used to blow out lines, it is still necessary to follow the above procedure. Keeping the pool heated and the filter pump running continuously will not be adequate protection. If there is a pump failure or an electrical power failure, the boiler cannot fire and may freeze and be damaged.

3. Improper Use of Heater: The Laars Pool Heating Boiler is not designed for continuous use as an "anti-freezing" device for pools. Operating the heater with low water temperatures will cause the fins on the heat exchanger to be partially blocked with condensation. Incomplete combustion and prolonged operation under these conditions will result in the heat exchanger sooting up. This can seriously damage the heater and may create a dangerous fire hazard.

3.8 Time Clock Operation

During the warm-up period, the heater must run

continuously so it can raise the pool temperature from cold to above 70°F (21°C).

LAARS HEATING SYSTEMS

Remove all time clock stops and permit the heater to raise pool temperature to 70°F (21°C) or above in one continuous operation.

When the time clock stops are replaced, be sure to allow the filter pump and the heater to stay on long enough to keep the pool up to the desired temperature.

3.9 Therapeutic Pools (Spas)

Therapeutic pools or "spa" pools are usually piped and controlled so that very warm or hot water, often with air injection, is forced at high velocity into a confined area of a swimming pool or into a small separate pool. For the purposes of this manual, any application in which the water temperature is maintained above 85°F (30°C) is considered a spa.

SPECIAL SET-UP AND OPERATING PROCEDURES APPLY TO SPAS.

1. Models 1010I and 1010E and larger should not

be used for spas due to their higher temperature

rises.

2. Since outlet temperatures can approach 140°F

(60°C) units must be piped in a secondary,

parallel loop similar to that shown in Figure 10.

The bypass line between the inlet and outlet can

be deleted or, if it is installed, the BYPASS

valve should be closed with the handle removed.

3. To insure that the spa inlet water does not

exceed 104°F (40°C), the spa filter pump must

circulate at the minimum flow rates shown in

Table 6.

Boiler Model Minimum Filter Pump Flow Rate

500 220 GPM 600 270 GPM 715 320 GPM 850 380 GPM

Table 6. Minimum Filter Pump Flow Rates For Spas.

Note: Maximum Spa Temperature Is

Assumed To Be 100°F (38°C).

4. The high limit stop should be changed to 140°F

(60°C). The set point should then be checked

following the procedure in 3C-2.

5. Use the outlet valve “A” to set the temperature

rise as shown in Table 5. Note there should be

no bypass piping or flow in these installations.

6. Spas are excellent for relaxation, body-

conditioning and for arthritic and rheumatic

problems, but can be hazardous. The Consumer

Product Safety Commission has recommended

the following "Safety Rules for Hot Tubs:"

a. Spa or hot tub water temperature 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.

Mighty Therm Commercial Pool Heating Boiler

Pilot Valve

ON POSITION

Main Gas Valve

Pilot Valve

OFF POSITION

Main Gas Valve

Figure 15. Manual Gas Valves.

Pilot Relay Manual Reset Switch (Standing Pilot Systems) Part # W0030000

Figure 16. Pilot Safety Relay.

Pilot Reset Switch

b. 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.

c. 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.

d. Before entering the spa or hot tub, users

should check the water temperature with an accurate thermometer; spa or hot tub thermostats may err in regulating water temperatures by as much as four degrees Fahrenheit (2.2°C).

Page 15

e. 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.

f. Persons taking medications which induce

drowsiness, such as tranquilizers, antihistamines or anticoagulants, should not use spas or hot tubs.

SECTION 4. Maintenance

1. Lubricate the pump seal every 6 months with ½ oz. of SAE 30 non-detergent oil. Slowly add to pump oil cup located on top of the bearing bracket.

2. At start-up and every six (6) months thereafter, the pilot and main burner flame should be observed for proper performance (see Figure 17). See attached lighting and shut-down instructions for proper pilot flame pattern. If flame has the appearance of "sooting" tips, check for debris near orifices and call the Laars Service Department.

3. Inspect the venting system for obstruction, leakage and corrosion at least once each year.

4. Keep heater area clear and free from combustible material, gasoline and other flammable vapors and liquids (see Table 1 for minimum clearances).

5. Be certain all combustion air and ventilation openings in the room are unobstructed.

6. Check for fouling on the external surfaces of the heat exchanger every six months. (NOTE: after installation and first start-up, check the heat exchanger for fouling after the following periods of operation: 24 hours, 7 days, 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. As soon as any fouling is observed, the cause of the fouling should be corrected (see Section 5, Troubleshooting Guide). The heat exchanger can be checked with a flashlight by locating a mirror under the burners. An alternate method is to remove the venting and top panels as necessary to inspect the heat exchanger from above. Also check the vent system for defects at this time. (If cleaning is required, shut off all electrical and gas supply to the heater.)

7. To expose the heat exchanger: Indoor Models: Remove the flue pipe, top of

unit, rear upper jacket, flue collector rear panel and heat exchanger baffles.

Page 16

Outdoor Models: Remove vent top assembly, rear upper jacket, flue collector rear panel and heat exchanger baffles.

8. To remove all burners: It is usually more convenient to remove the

burner tray assembly. Disconnect sensor wire, ignition cable (or thermocouple generator) and pilot gas line. Disconnect manifold inlet union(s). Remove the four (4) retaining screws. Grasp the manifold pipe and slide out the burner tray.

LAARS HEATING SYSTEMS

Figure 17. Main Burner Flame Pattern.

Caution

Black carbon or green soot on a dirty heat exchanger can, under certain conditions, be ignited by a random spark or open flame. To prevent this unlikely occurrence, dampen the soot deposits with wet brush or fine water spray before servicing or cleaning the heat exchanger.

9. Clean heat exchanger using a wire brush to remove soot and loose scale from the unit. Clean fallen debris from bottom of heater. Make sure burner ports are clear and pilot assembly is free of debris.

10. Reassemble in reverse order and be sure the heat exchanger baffles are replaced.

11. The gas and electric controls installed on the heater are engineered for both dependable operation and long life, but the proper functioning of these components is necessary for safe operation of the heater. It is strongly recommended that the basic items be checked by a competent serviceman every year and replaced when necessary. The basic controls are:

a. Water temperature controls.

b. Pilot safety system.

c. Automatic electric gas valve(s)

d. Flow switch.

12. Low water cutoffs should be inspected every six (6) months, when provided.

NOTE: The warranty does not cover any damage caused by lack of required maintenance or improper operating practices.

13. Pool Water Chemistry

The mineral content of the pool water increases every day. This is due to the natural evaporation which removes only distilled water and leaves the minerals behind. The regular addition of algicidal and sanitizing chemicals also adds greatly to the mineral content of the pool. If the concentration of minerals in the pool is permitted to become too

high, the minerals will precipitate out of the water and deposit onto the walls of the pool, in the filter and in the tubes of the heat exchanger.

For this reason it is very advantageous to drain the pool regularly (at least every two years). This precautionary measure will save the cost of expensive repairs to the finish, filter system and heater.

Another important safety precaution - always keep the pH of the pool water between 7.3 and

7.7. This will add years to the life of the pool finish, filter system and heater.

Most algicidal and sanitizing chemicals contain sodium hypochlorite, while others contain calcium hypochlorite. Sodium is not a scaling chemical but calcium is. When using calcium hypochlorite it is especially important to frequently check the pH of the pool and to change the pool water when the dissolved solids indicate an excessive mineral content.

SECTION 5. Troubleshooting

For proper service and problem diagnosis of the heater and heater system, the following tools are required:

a. Gas pressure test kit with range from zero to 14

W.C. Either a slack tube manometer or an

accurate gas pressure gauge is acceptable with

proper adapters to connect to the available

fittings in the line and on the gas valve.

b. Multi-meter with the following ranges:

0 to 500 volts A.C.

0 to 1000 ohms continuity.

0 to 50 millivolts.

c. Tube cleaning kit consisting of reamer, stainless

steel brush, speed handle and handle extensions.

d. A pool thermometer with a proper range.

e. A pressure gauge with proper range.

Mighty Therm Commercial Pool Heating Boiler

Page 17

1. Symptom: heater is pounding, knocking or emitting steam from relief valve

Possible Cause What to Do

A. Low or no water flow A. Is the heater wired into the filter pump circuit so that the heater cannot fire

(most likely). unless the pump is running?

Check to see that all valves in system are open to be sure that water can circulate through the heater.

Check pool filter, clean if clogged. Examine heater pump for clogged or frozen impeller. Check flow switch for proper operation and range setting.

B. Debris from system piping B. Remove header covers. Examine all tubes and waterways. Clean out tubes.

is blocking tubes. Use new gaskets when reassembling.

C. Scale has formed in tubes C. Clean tubes with tube cleaning kit. Determine hardness. Check water flow, and

from high mineral content. clean pool filter.

2. Symptom: heater will not fire

A. Heater not getting power. A. Check to see that power switch is "ON." Use testing device to trace power to

heater power source. Check fuse and secondary voltage in heater control.

B. Operating or safety control has B. Turn off power. Check continuity across terminals of each operating and safety

opened circuit to electric gas valve. control switch up to the electric gas valve. Replace defective control. C. Pilot flame is out. C. Relight pilot per instruction. D. Manual reset device has tripped. D. Reset pilot safety and all manual reset safety switches. Follow instructions for

start-up.

E. No gas pressure to burners. E. Trace gas line to service shutoff cock. If service cock is open, trace gas line to

meter. If no pressure is present at meter, call for public utility service. If gas is present in heater inlet, check pressures in following sequence: (1) downstream from pressure regulator; (2) downstream from electric gas valve. Replace or adjust as necessary.

F. Electric gas valve operator is F. Disconnect wiring harness at gas valve terminals. Check continuity of actuator

burned out or shorted. coil. If open circuit or short is indicated, replace coil or operator.

G. Pump does not run. G. Operate in manual. Check power to pump from relay, Check that pump/motor is free to rotate. Replace relay or motor as necessary.

H. Pump runs, but flow switch H. Check continuity across flow switch. Inspect paddle for proper movement.

not closing. Adjust flow range setting.

I. Field interlock open. I. Jumper terminals and isolate problem in other equipment.

3. Symptom: pressure relief valve leaking intermittently or steadily

A. Faulty relief valve. A. Replace with a new relief valve with proper setting (see rating plate).

4. Symptom: soot in flueways or in tubes, or noxious fumes from bad combustion

A. Combustion air supply to heater A. Check air supply opening. Look for debris in screen or louvre which covers

room is inadequate. combustion air opening, or for objects blocking the opening.

B. Stack or vent is blocked or restrictive. B. Look for blocked stack and excessive number of elbows in stack or excessive

C. Severe downdraft is causing C. Check for (1) proper vent cap on stack; (2) adequate height of stack above

spillage of flue products into room. roof; (3) equipment exhausting air from inside of building; and (4) proper

D. Gas pressure to burners is excessive. D. Check gas pressure with manometer, and adjust with heater firing at full rate. E. Heater not fitted for the fuel supplied. E. See nameplate for correct fuel. F. Heater installed at high altitude F. Installations at altitudes in excess of 2000 ft. above sea level are subject to

without proper derating. jurisdiction of the local inspection authorities. Check orifice size, contact your

5. Symptom: water dripping in firebox

A. Tube in heat exchanger has A. Tube failure is almost always caused by scale formation in the tube, or

overheated and ruptured. inadequate water flow through the heater.

B. Heater is condensing from low B. Check bypass valve adjustment.

inlet temperature.

length of horizontal runs.

installation of draft diverter.

dealer or factory for proper size.

Page 18

SECTION 6. Parts Description and Order Numbers

LAARS HEATING SYSTEMS

(2) (2) (2) (4) (4) (4) (4) (4) (4)

Front and Rear (2)

7 Tile Cover, Front/Rear {Indoor} 10534201 10534202 10534203 10534204 10534205 10534206 10534207 10661508 10661509

5 Rear Panel, Flue Collector {Indoor} 10535501 10535502 10535503 10535504 10535505 10535506 10535507 10535508 10535509

Key Description Size Size Size Size Size Size Size Size Size

No 500 600 715 850 1010 1200 1430 1670 1825

Jacket and Combustion Chamber Components

1 Top Panel Assembly 10535701 10535702 10535703 10535704 10535705 10535706 10535707 10535708 10535709

2 Spacer, Flue Collector - - - 10540800 10540800 10540800 10540800 10540800 10540800

3 End Panel, Flue Collector, Left 10533700 10533700 10533700 10533700 10533700 10533700 10533700 10533700 10533700

6 Front Support, Flue Collector {Indoor} 10534401 10534402 10534403 10534404 10534405 10534406 10534407 10662108 10662109

4 End Panel, Flue Collector, Right 10533800 10533800 10533800 10533800 10533800 10533800 10533800 10533800 10533800

8 Tile Heat Shield/Spacer, 10560100 - - ------

9 Tile Heat Shield/Spacer, Front - 10547901 10547902 - - 10547903 10547901 10547904 10547903

10 Tile Heat Shield/Spacer, Front - - - 10548002 10548003 - - - 10548001

11 Tile Heat Shield/Spacer, Front - - - - - 10548101 10548102 10548103 10548104

12 Tile Heat Shield/Spacer, Rear - 10548201 10548202 - - 10548203 10548201 10548204 10548203

13 Tile Heat Shield/Spacer, Rear - - - 10548302 10548303 - - - 10548301

14 Tile Heat Shield/Spacer, Rear - - - - - 10548401 10548402 10548403 10548404

(2) (2) (2) (2) (2) (2) (2) (2) (2)

15 Saddle Assembly, End Tile 10533600 10533600 10533600 10533600 10533600 10533600 10533600 10533600 10533600

16 Lower End Panel/ 10540701 10540701 10540701 10540701 10540701 10540701 10540701 10540701 10540701

Heat Shield Weldment, Right

Heat Shield Weldment, Left

Weldment

Heat Shield Weldment

17 Lower End Panel/ 10540702 10540702 10540702 10540702 10540702 10540702 10540702 10540702 10540702

18 Lower Rear Panel 10532901 10532902 10532903 10532904 10532905 10532906 10532907 10532908 10532909

19 Middle Rear Panel/ 10540401 10540402 10540403 10540404 10540405 10540406 10540407 10540408 10540409

20 End Panel, Upper Right 10531600 10531600 10531600 10531600 10531600 10531600 10531600 10531600 10531600

21 End Panel, Upper Left 10534000 10534000 10534000 10534000 10534000 10534000 10534000 10534000 10534000

(2) (2) (2) (2) (2) (2) (2) (2) (2)

Heat Shield Weldment

22 Upper Rear Panel/ 10540501 10540502 10540503 10540504 10540505 10540506 10540507 10540508 10540509

23 Front Panel, Upper 10531501 10531502 10531503 10531504 10531505 10531506 10531507 10531508 10531509

24 Bracket, Support, End Tile 10551000 10551000 10551000 10551000 10551000 10551000 10551000 10551000 10551000

25 Drafthood, Relief Baffle, Right 10540901 10540902 10540903 10540904 10540905 10540906 10540907 10540908 10540909

Heat Shield Weldment

26 Drafthood, Relief Baffle, Left 10541001 10541002 10541003 10541004 10541005 10541006 10541007 10541008 10541009

27 Lower Front Panel/ 10554601 10554602 10554603 10554604 10554605 10554606 10554607 10554608 10554609

NOTE: Numbers in ( ) represent quantity required for each size. Quantity is one otherwise.

Mighty Therm Commercial Pool Heating Boiler

Page 19

Figure 18. Parts Identification.

Page 20

LAARS HEATING SYSTEMS

(14)

(28) (14)

(2) (2) (2) (2) (2) (2) (2) (2) (2)

Non-Combustible Base {Rail} 10539000 10539000 10539000 10539000 10539000 10539000 10539000 10539000 10539000

Key Description Size Size Size Size Size Size Size Size Size

No 500 600 715 850 1010 1200 1430 1670 1825

28 Middle Front Panel {Indoor} 10554401 10554402 10554403 10554404 10554405 10554406 10554407 10662008 10662009

29 Sweep Sheet, Flue Collector {Indoor} 10533901 10533902 10533903 10533904 10533905 10533906 10533907 10662208 10662209

30 Control Box Weldment 10545800 10545800 10545800 10545800 10545800 10545800 10545800 10545800 10545800

31 Control Box Cover {Indoor} 10547200 10547200 10547200 10547200 10547200 10547200 10547200 10547200 10547200

32 Base/Tile Support Assembly {Indoor} 10536901 10536902 10536903 10536904 10536905 10536906 10536907 10536908 10536909

33 Tile Assemblies {Refer to Figure 20 for configurations and Part Numbers}

Optional Items

Water System

34 8-Tube Assembly, Copper Tubes/ 10534701 10534702 10534703 10534704 10534705 10534706 10534707 - -

Cast Iron Tubs {Indoor}

8-Tube Assembly, Copper Tubes/ 10542901 10542902 10542903 10542904 10542905 10542906 10542907 - -

Bronze Tubs {Indoor}

8-Tube Assembly, CU-NI Tubes/ 10553601 10553602 10553603 10553604 10553605 10553606 10553607 - -

Cast Iron Tubs {Indoor}

8-Tube Assembly, CU-NI Tubes/ 10553701 10553702 10553703 10553704 10553705 10553706 10553707 - -

Bronze Tubs {Indoor}

10-Tube Assembly, Copper Tube/ - - - ----10665908 10665909

Cast Iron Tubs {Indoor}

10-Tube Assembly, Copper Tube/ - - - ----20001108 20001109

Bronze Tubs {Indoor}

10-Tube Assembly, CU-NI Tubes/ - - - ----20001008 20001009

Cast Iron Tubs {Indoor}

(7) (14) (14) (14) (14) (28) (28) - -

10-Tube Assembly, CU-NI Tubes/ - - - ----10670408 10670409

Bronze Tubs {Indoor}

Rear {Indoor} (2) (2) (2) (4) (4) (4) (4) (4) (4)

35 Baffle, Heat Exchanger Front/ 10534301 10534302 10534303 10534304 10534305 10534306 10534307 20020108 20020109

36 Baffle, Heat Exchanger {8-Tube} 10534601 10534602 10534603 10534604 10534605 10534606 10534607 - -

Baffle, Heat Exchanger {10-Tube} - - - -----10667702

Baffle, Heat Exchanger {10-Tube} - - - ----10667708 10667709

NOTE: Numbers in ( ) represent quantity required for each size. Quantity is one otherwise.

Mighty Therm Commercial Pool Heating Boiler

Page 21

[S0094300 Glassed Cast Iron]

Inlet/Outlet Header, Machined 10364501 10364501 10364501 10364501 10364501 10364501 10364501 10364501 10364501

[S0064000 Bronze]

[S0063600 Cast Iron]

Flange, 2-1/2" NPT Machined 10391304 10391304 10391304 10391304 10391304 10391304 10391304 10391304 10391304

[S0064400 Bronze]

Key Description Size Size Size Size Size Size Size Size Size

No 500 600 715 850 1010 1200 1430 1670 1825

37 Inlet/Outlet Header, Machined 10364500 10364500 10364500 10364500 10364500 10364500 10364500 10364500 10364500

38 Flange, 2-1/2" NPT Machined 10391303 10391303 10391303 10391303 10391303 10391303 10391303 10391303 10391303

[Glassed Cast Iron]

Tee, Machined Flange [Bronze] 20150303 20150303 20150303 20150303 20150303 20150303 20150303 20150303 20150303

39 Tee, Machined Flange 20130002 20130002 20130002 20130002 20130002 20130002 20130002 20130002 20130002

40 Baffle, Water Inlet 10338300 10338300 10338300 10338300 10338300 10338300 10338300 10338300 10338300

41 Barrier, Water 20230101 20230101 20230101 20230101 20230101 20230101 20230101 20230101 20230101

(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 S0095100 S0095100 S0095100 S0095100 S0095100

(2) (2) (2) (2) (2) (2) (2) (2) (2)

44 Well, Immersion E2074000 E2074000 E2074000 E2074000 E2074000 E2074000 E2074000 E2074000 E274000

3/4 NPT 75 PSI

45 Well, High Limit E0025900 E0025900 E0025900 E0025900 E0025900 E0025900 E0025900 E0025900 E0025900

46 Valve, Pressure Relief A0063300 A0063300 A0063300 A0063600 A0063600 A0063600 A0063600 A0063600 A0063600

(2) (2) (2) (2) (2) (2) (2) (2) (2)

47 Temperature Gauge A2089500 A2089500 A2089500 A2089500 A2089500 A2089500 A2089500 A2089500 A2089500

48 Flow Switch {Indoor} E0013100 E0013100 E0013100 E0013100 E0013100 E0013100 E0013100 E0013100 E0013100

Flow Switch {Outdoor} E0013000 E0013000 E0013000 E0013000 E0013000 E0013000 E0013000 E0013000 E0013000

49 Pump, Motor, Impeller A2089200 A2089200 A2089200 A2089200 A2089200 A2089200 A2089200 A2089200 A2089300

50 Pump Adapter {Glassed Cast Iron} 10364200 10364200 10364200 10364200 10364200 10364200 10364200 10364200 10364200

Pump Adapter {Cast Bronze} 10364201 10364201 10364201 10364201 10364201 10364201 10364201 10364201 10364201

Pump Housing {Bronze} 10483301 10483301 10483301 10483301 10483301 10483301 10483301 10483301 10483301

51 Pump Housing {Glassed Cast Iron} 10261501 10261501 10261501 10261501 10261501 10261501 10261501 10261501 10261501

52 Baffle, Diffuser 10338400 10338400 10338400 10338400 10338400 10338400 10338400 10338400 10338400

53 Pump Housing Gasket S0024600 S0024600 S0024600 S0024600 S0024600 S0024600 S0024600 S0024600 S0024600

54 Pump Motor Gasket, A0021400 A0021400 A0021400 A0021400 A0021400 A0021400 A0021400 A0021400 A0021400

NOTE: Numbers in ( ) represent quantity required for each size. Quantity is one otherwise.

Page 22

LAARS HEATING SYSTEMS

Gas System

Single Sect. Manifold {Nat.}

Burner Tray, IID, On/Off, 20097401 20097402 20097403 20097404 20097405 20097406 20097407 20097408 20097409

Single Sect. Manifold {LP}

Burner Tray, St. Pilot, On/Off, 10526201 10526202 10526203 10526204 10526205 10526206 10526207 10526208 10526209

Single Sect. Manifold {Nat.}

Burner Tray, St. Pilot, On/Off, 10529601 10529602 10529603 10529604 10529605 10529606 10529607 10529608 10529609

Single Sect. Manifold {LP}

{Single Inlet}

Key Description Size Size Size Size Size Size Size Size Size

No 500 600 715 850 1010 1200 1430 1670 1825

55 Burner Tray, IID, On/Off, 10550601 10550602 10550603 10550604 10550605 10550606 10550607 10550608 10550609

56 Gas Manifold Weldment 10525901 10525902 10525903 10525904 10525905 10525906 10525907 10525908 10525909

{Honeywell}

57 Burner, Main L0052300 L0052300 L0052300 L0052300 L0052300 L0052300 L0052300 L0052300 L0052300

58 Pilot Bracket/Burner Weldment 10529502 10529502 10529502 10529502 10529502 10529502 10529502 10529502 10529502

Standing Pilot {Nat.}

Pilot Burner {Honeywell} W0034400 W0034400 W0034400 W0034400 W0034400 W0034400 W0034400 W0034400 W0034400

Standing Pilot {LP}

Pilot Burner {Honeywell} W0034300 W0034300 W0034300 W0034300 W0034300 W0034300 W0034300 W0034300 W0034300

59 Pilot Burner {Honeywell} W0035800 W0035800 W0035800 W0035800 W0035800 W0035800 W0035800 W0035800 W0035800

IID Pilot {Nat.}

Pilot Burner {Honeywell} W2001500 W2001500 W2001500 W2001500 W2001500 W2001500 W2001500 W2001500 W2001500

IID Pilot {LP}

60 Orifice, Nat. Gas - 4" W.C. L0050700 L0050700 L0050700 L0050700 L0050700 L0050700 L0050700 L0050700 L0050700

{Sea Level} (22) (26) (30) (36) (42) (50) (60) (70) (76)

Orifice, Propane - 9" W.C. L0032900 L0032900 L0032900 L0032900 L0032900 L0032900 L0032900 L0032900 L0032900

{Sea Level} (22) (26) (30) (36) (42) (50) (60) (70) (76)

61 Valve, Manual, Gas {Nat.} V0004200 V0004200 V0004200 V0004300 V0004300 V0004300 V0004300 V0004300 V0004300

Valve, Manual, Gas {LP} V0004800 V0004800 V0004800 V0004800 V0004200 V0004200 V0004300 V0004300 V0004300

Safety Gas Valve, On-Off {LP} V0046600 V0046600 V0046600 V0046600 V0046600 V0046600 V0046700 V0046700 V0046700

62 Safety Gas Valve, On-Off {Nat.} V0046600 V0046600 V0046600 V0046600 V0046700 V0046700 V0046700 V0046700 V0046800

On-Off {Nat.}

Valve, Gas, Operating/Reg. V0054800 V0054800 V0054800 V0054800 V0054800 V0054800 V0054900 V0054900 V0054900

63 Valve, Gas, Operating/Reg. V0051200 V0051200 V0051200 V0051200 V0051300 V0051300 V0051300 V0051400 V0051400

On-Off {LP}

64 Valve, Pilot, Gas Manual W0002100 W0002100 W0002100 W0002100 W0002100 W0002100 W0002100 W0002100 W0002100

NOTE: Numbers in ( ) represent quantity required for each size. Quantity is one otherwise.

Mighty Therm Commercial Pool Heating Boiler

Page 23

{Single Pilot}

Key Description Size Size Size Size Size Size Size Size Size

No 500 600 715 850 1010 1200 1430 1670 1825

65 Manifold Cover Plate Assembly 10552901 10552902 10552903 10552904 10552905 10552906 10552907 10552908 10552909

66 Burner Anti-Rotation Bracket 10525301 10525302 10525303 10525304 10525305 10525306 10525307 10525308 10525309

67 Burner Tie Down Bracket, Left 10525701 10525702 10525703 10525704 10525705 10525707 10525708 10525709 10525710

68 Burner Tie Down Bracket, Right 10542001 10542002 10542003 10542004 10542005 10542007 10542008 10542009 10542010

Man. Reset Pilot Relay (std.pilot) W0030000 W0030000 W0030000 W0030000 W0030000 W0030000 W0030000 W0030000 W0030000

69 Thermocouple {Standing Pilot} W0036500 W0036500 W0036500 W0036500 W0036500 W0036500 W0036500 W0036500 W0036500

70 Pilot Solenoid Valve (IID) W0019300W0019300 W0019300 W0019300 W0019300 W0019300 W0019300 W0019300 W0019300

Electrical Components

U.S. {Nat.}

Ignition Control, Elec. Can./ E2033900 E2033900 E2033900 E2033900 E2033900 E2033900 E2033900 E2033900 E2033900

Spark LP/CSD-1 {100% Lkout}

71 Ignition Control, Electronic, E0100900 E0100900 E0100900 E0100900 E0100900 E0100900 E0100900 E0100900 E0100900

72 Transformer, 115V/24V E0086100 E0086100 E0086100 E0086100 E0086100 E0086100 E0086100 E0086100 E0086100

73 Switch, High Limit, Manual Reset E2103900 E2103900 E2103900 E2103900 E2103900 E2103900 E2103900 E2103900 E2103900

74 Controller, Water Temp. E2103800 E2103800 E2103800 E2103800 E2103800 E2103800 E2103800 E2103800 E2103800

Electrical Components {Optional}

M/R High Gas Pressure Switch E0023300 E0023300 E0023300 E0023300 E0023300 E0023300 E0023300 E0023300 E0023300

M/R Low Gas Pressure Switch E0023500 E0023500 E0023500 E0023500 E0023500 E0023500 E0023500 E0023500 E0023500

M/R Low Water CutOff E2075100 E2075100 E2075100 E2075100 E2075100 E2075100 E2075100 E2075100 E2075100

Vent Valve 120 Volts {System 4} V0019000 V0019000 V0019000 V0019000 V0019000 V0019000 V0019000 V0019000 V0019000

Vent Valve 24 Volts {System 9, 11} V2000100 V2000100 V2000100 V2000100 V2000100 V2000100 V2000100 V2000100 V2000100

Outdoor Jacket, Combustion Chamber, Heat Exchanger Components

Refer To Figure 19 For Placement

75 Sensor, Water Temp. E2103600 E2103600 E2103600 E2103600 E2103600 E2103600 E2103600 E2103600 E2103600

{Outdoor}

5 Rear Panel, Flue Collector {Outdoor} 10661701 10661702 10661703 10661704 10661705 10661706 10661707 10661708 10661709

6 Front Support, Flue Collector 10662101 10662102 10662103 10662104 10662105 10662106 10662107 10662108 10662109

(2) (2) (2) (4) (4) (4) (4) (4) (4)

7 Tile Cover, Front/Rear {Outdoor} 10661501 10661502 10661503 10661504 10661505 10661506 10661507 10661508 10661509

28 Middle Front Panel {Outdoor} 10662001 10662002 10662003 10662004 10662005 10662006 10662007 10662008 10662009

{Outdoor}

29 Sweep Sheet, Flue Collector 10662201 10662202 10662203 10662204 10662205 10662206 10662207 10662208 10662209

NOTE: Numbers in ( ) represent quantity required for each size. Quantity is one otherwise.

Page 24

LAARS HEATING SYSTEMS

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 number.

Figure 19. Tile Assemblies.

Mighty Therm Commercial Pool Heating Boiler

Page 25

Figure 20. Outdoor Parts.

Page 26

LAARS HEATING SYSTEMS

(14)

Support Assembly {Outdoor}

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 Assembly, 20001001 20001002 20001003 20001004 20001005 20001006 20001007 20001008 20001009

CU-NI Tubes/ Cast Iron Tubs {Outdoor}

10-Tube Assembly, 10670401 10670402 10670403 10670404 10670405 10670406 10670407 10670408 10670409

CU-NI Tubes/ Bronze Tubs {Outdoor}

Key Description Size Size Size Size Size Size Size Size Size

No 500 600 715 850 1010 1200 1430 1670 1825

31 Control Box Cover {Outdoor} 10630300 10630300 10630300 10630300 10630300 10630300 10630300 10630300 10630300

32 Non-Combustible Base/Tile 1060230110602302 10602303 10602304 10602305 10602306 10602307 10602308 10602309

34 10-Tube Assembly, 10665901 10665902 10665903 10665904 10665905 10665906 10665907 10665908 10665909

{Outdoor} (2) (2) (2) (2) (2) (2) (2) (2) (2)

35 Baffle, Heat Exchanger Front/Rear 20020101 20020102 20020103 20020104 20020105 20020106 20020107 20020108 20020109

36 Baffle, Heat Exchanger, 10-Tube 10667701 10667702 10667703 10667704 10667705 10667706 10667707 10667708 10667709

(7) (14) (14) (14) (14) (28) (28) (28) (14)

Baffle, Heat Exchanger, 10-Tube - - - -----10667702

(2) (2) (2) (2) (2) (2) (2) (2) (2)

Refer To Figure 21 For Placement

1 Top Panel 10660701 10660702 10660703 10660704 10660705 10660706 10660707 10660708 10660709

2 Rear Windshield 10658101 10658102 10658103 10658104 10658105 10658106 10658107 10658108 10658109

3 Upper Rear Louver shield 10657101 10657102 10657103 10657104 10657105 10657106 10657107 10657108 10657109

4 Upper Rear Panel 10658701 10658702 10658703 10658704 10658705 10658706 10658707 10658708 10658709

5 Gap Closure-Side 10660200 10660200 10660200 10660200 10660200 10660200 10660200 10660200 10660200

6 Gap Closure-Middle 10660101 10660102 10660103 10660104 10660105 10660106 10660107 10660108 10660109

(2) (2) (2) (2) (2) (2) (2) (2) (2)

7 Lower Rear Panel Assembly 10660501 10660502 10660503 10660504 10660505 10660506 10660507 10660508 10660509

8 Rear End Panel Left and Right 10657700 10657700 10657700 10657700 10657700 10657700 10657700 10657700 10657700

10 Rear Base Extension 10658501 10658502 10658503 10658504 10658505 10658506 10658507 10658508 10658509

11 Gas Train Interface Plate 20050200 20050200 20050200 20050200 20050200 20050200 20050200 20050200 20050200

9 Lower Rear Shield-Inner 10659901 10659902 10659903 10659904 10659905 10659906 10659907 10659908 10659909

12 Left 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 10657502

14 Front Base Extension 10659701 10659702 10659703 10659704 10659705 10659706 10659707 10659708 10659709

Left Door Panel Weldment - - - - 20100705 20100706 20100707 20100708 20100709

15 Door Panel Weldment 20050401 20050402 20050403 20050404 20050405 20050406 20050407 20050408 20050409

NOTE: Numbers in ( ) represent quantity required for each size. Quantity is one otherwise.

Mighty Therm Commercial Pool Heating Boiler

Page 27

Pump Coupler Assembly, A2010500 A2010500 A2010500 A2010500 A2010500 A2010500 A2010500 A2010500 A2010500

Key Description Size Size Size Size Size Size Size Size Size

No 500 600 715 850 1010 1200 1430 1670 1825

16 Front Windshield 10659101 10659102 10659103 10659104 10659105 10659106 10659107 10659108 10659109

17 Upper Front Panel 10658901 10658902 10658903 10658904 10658905 10658906 10658907 10658908 10658909

18 Flue Panel Front 10659501 10659502 10659503 10659504 10659505 10659506 10659507 10659508 10659509

19 Flue Panel Rear 10659301 10659302 10659303 10659304 10659305 10659306 10659307 10659308 10659309

20 Pump Cover Assembly 20050100 20050100 20050100 20050100 20050100 20050100 20050100 20050100 20050100

Pump Parts

Armstrong 1050

Pump Module, Shaft and Bearing, A2010100 A2010100 A2010100 A2010100 A2010100 A2010100 A2010100 A2010100 A2010100

Armstrong 1050

Seal Kit, Armstrong 150 A2010200 A2010200 A2010200 A2010200 A2010200 A2010200 A2010200 A2010200 A2010200

Impeller, Armstrong 1050, 4.53" dia. A2010304 A2010304 A2010304 A2010304 A2010304 A2010304 A2010304 A2010304 -

Impeller, Armstrong 1050, 4.85" dia. - - - -----A2010305

Waterpik Technologies, Inc. 6000 Condor Drive, Moorpark, CA 93021 • 805.529.2000 • FAX 805.529.5934 20 Industrial Way, Rochester, NH 03867 • 603.335.6300 • FAX 603.335.3355 480 S. Service Road West, Oakville, Ontario, Canada L6K 2H4 • 905.844.8233 • FAX 905.844.2635

H0067300Q

Mighty Therm AP, AP0500, AP0600, AP0715, AP0850 Installation And Operation Instructions Manual

Specifications and Main Features

Frequently Asked Questions

User Manual