Laars Mighty Max VW Installation, Operation And Maintenance Manual
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Laars Mighty Max VW Installation, Operation And Maintenance Manual

Laars Mighty Max VW Installation, Operation And Maintenance Manual

Volume water heaters sizes 320m - 400m
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Installation, Operation and Maintenance Instructions
Installation,
Operation and
Maintenance
Instructions for
Mighty Max
Volume Water Heaters
Model VW
Sizes 320M - 400M
U.S. Reg. 1,901,192
Canada Reg. 433,882
FOR YOUR SAFETY: This product must be installed and serviced by a professional service technician,
qualified in hot water heater 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
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.
WARNING
A subsidiary of BRADFORD WHITE Corporation
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.
Document 2064D

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Summary of Contents for Laars Mighty Max VW

  • Page 1 Installation, Operation and Maintenance Instructions Document 2064D Installation, Operation and Maintenance Instructions for Mighty Max Volume Water Heaters Model VW Sizes 320M - 400M U.S. Reg. 1,901,192 Canada Reg. 433,882 FOR YOUR SAFETY: This product must be installed and serviced by a professional service technician, qualified in hot water heater installation and maintenance.

  • Page 2: Table Of Contents

    Venturi and Gas Pressure Regulator 2.12 Electrical Wiring .......... 15 System ............26 Electrical Components ....... 26 5.3.1 General Troubleshooting ......26 5.3.2 Electrical Troubleshooting ......27 SECTION 6. Parts List for Mighty Max VW Heater General Information ........27...

  • Page 3: General Information

    Parts List, for part number). SECTION 2. 1.2 Warranty Installation Instructions The Mighty Max VW heaters are sold with a limited factory warranty. Details are specified on the back cover of this manual. 2.1 General Information Make all warranty claims to an authorized Laars Install the Mighty Max VW heater in accordance representative or directly to the factory.

  • Page 4: Heater Placement

    (see the factory. Section 6, Parts List). The Mighty Max VW heater is designed- Do not locate the heater in an enclosure or through- certified for installation on a combustible floor, if a wall recess. Avoid locations where wind deflection non-combustible base is first placed under the heater.

  • Page 5: Gas Supply And Piping

    Check the rating plate to make sure the heater is (see Sections 2.8 through 2.11 for details). fitted for the type of gas being used. Laars heaters are normally equipped to operate below a Air Shutter 2000 foot (610m) altitude.

  • Page 6: Water System Piping

    Minimum inlet water temperature is 120°F 2.7.1 Water Chemistry (49°C). Laars equipment is designed to be used in a VW heaters are intended for heating large variety of water conditions. The water velocity in the volumes of water at constant flow rates, usually for heat exchanger tubes is kept high enough to prevent storage in a tank.

  • Page 7: Pressure Buildup In Water System

    Table 5 specifies water flow rates for the The temperature and pressure relief valve must Mighty Max VW heaters, and the pumping head have a BTU/h (kW) capacity rating that is greater than required for typical piping configurations. Table 5 the BTU/h (kW) input of the water heater.

  • Page 8: Combined Space Heating/Potable Water Heating Systems

    Mixing Valve by changing the piping or pump. 2.7.6 Combined Space Heating/Potable Water Heating Systems When using the Mighty Max VW heater as a Out - source of heat for a combined space heating/potable Mixed Water water heating system, be sure to follow the...

  • Page 9: Venting And Combustion Air Information

    Notes: 1. Pressure dop includes allowance for 30 feet 9.1m of piping and normal fittings. If piping is shorter or of larger diameter, pump power may be reduced substantially. Contact Laars Representative for assistance. 2. Heaters for soft water application should be equipped with cupronickel heat exchangers.

  • Page 10: Horizontal Venting - Non Category I

    Non-Category I venting: Locate the terminal so the vent exhaust does not Laars specified vent pipe material (Table 6) and settle on building surfaces and other nearby sizes (Table 7). objects. Vent products may damage such Pipe insulation and sealing tape.
  • Page 11 Mighty Max Volume Water Heater Page 11 Category I For vertically ducted combustion air: • Combustion air intake must terminate at least 3 feet (0.91m) lower than vent termination, if it is located within a 10 foot (3.05m) radius. • Combustion air intake must be at Vertical Venting (Category I) least 1 foot (0.3m) above roof top Combustion Air In...
  • Page 12 LAARS Heating Systems Page 12 Blank Plate On Adapter Plate Heater Jacket Top Panel Top Panel Blank Plate On Vent Flue Collector Collar/Stack Blank Plate (Heater Jacket) 1. Removal of Blank Plate and Adapter 3. Blank Plate Placement Plate From Heater...

  • Page 13: Air For Combustion And Ventilation

    In how a blocked vent safety system should be connected general, installations which take air from inside the to a LAARS product, please call Applications building require larger passages than those which take Engineering at (603) 335-6300.

  • Page 14: Ducted Combustion Air

    2.11.2 Ducted Combustion Air Combustion air can be brought directly to the heater through a duct of suitable size and length (see Table 7). Consult Laars about installations not covered by Table 7. Combustion air must be taken from out-of-doors by means of the Laars side wall terminal.

  • Page 15: Electrical Wiring

    Mighty Max Volume Water Heater Page 15 Check heater wiring and pump for correct Term Description voltage, frequency, and phase. Pipe Single-wall galvanized steel pipe, Wire the heater and pump exactly as shown in 24 gauge minimum. the wiring diagram supplied with the heater (see Joint Sealing Permanent duct tape or aluminum Figure 11).
  • Page 16 LAARS Heating Systems Page 16 Figure 11. Wiring Diagram.

  • Page 17: Operation

    Mighty Max Volume Water Heater Page 17 SECTION 3. Front View of Boiler Operation Igniter WARNING Junction To avoid property damage, injury or loss of life, do not use this appliance if any part has been under water. Immediately call a qualified service technician to replace the appliance.

  • Page 18: Hi-Limit Checkout

    LAARS Heating Systems Page 18 Séquence normale d’opération. Quand la pompe Si l’allumeur n’arrive pas à allumer le brûleur de circulation est en marche, la chaudière se dans la troisième étape (par exemple, s’il y a de l’air mettra automatiquement en marche ou s’arrêtera dans le tuyau de gaz), la commande d’allumage ferme...

  • Page 19: Setting Temperature Controls

    Mighty Max Volume Water Heater Page 19 Wait five (5) minutes to clear out any gas, then flow system has two aspects - air flow and gas flow. smell for gas, including near the floor. Be sure to Air flow is checked by measuring pressures at service smell next to the floor because some gas is taps on the venturi.
  • Page 20 LAARS Heating Systems Page 20 Venturi Inlet Tap 5.8" WC Orifice Tap 4.0" WC Plenum Tap Figure 14. Unfired Venturi Differential Pressure - Figure 16. Gas Orifice Differential Pressure - Natural Gas. Natural Gas. a. Unfired Venturi Differential Pressure NOTE: Turn off the main manual gas valve.

  • Page 21: Venturi Setup Procedure - Natural Gas

    Gas Orifice Tap (Red) combustion air inlet, boiler and venting system. If there is no obvious cause contact a qualified Laars service technician. Figure 17. Measurement of Venturi Throat Pressure Approximately 40 seconds after the blower starts Differential - Propane Gas.

  • Page 22: Maintenance

    LAARS Heating Systems Page 22 Now that the heater is firing, use the blower SECTION 4. damper to readjust the venturi inlet pressure Maintenance according to the installation’s altitude in Table 11 (+1.6"w.c. at sea level). 4.1 General Instructions Elevation...

  • Page 23: Inspection Of The Heat Exchanger

    Mighty Max Volume Water Heater Page 23 4.2.1 Inspection of the Heat Exchanger WARNING Improper installation or maintenance can cause nausea or asphyxiation from carbon monoxide in flue gases which could result in severe injury, property damage, or death. AVERTISSEMENT Une installation ou un entretien inadéquat peut causer des nausées ou l’asphyxie provenant du monoxyde de carbone présent dans les gaz de...

  • Page 24: Cleaning The Heat Exchanger - Internal

    Remove the return cover of the heat exchanger. a soap/water solution then rinse with water only. It is important that the filter be dry before Clean the internal surface. (Laars offers a tube placing it back in the filter housing. cleaning kit part number R0010000.) Reassemble in the reverse order.
  • Page 25 Mighty Max Volume Water Heater Page 25 Figure 19. Troubleshooting Chart.

  • Page 26: Venturi And Gas Pressure Regulator System

    LAARS Heating Systems Page 26 Any of the following can prevent proper operation. Check these items first: Be sure the heater has been properly installed (see Section 2). Make sure the pump is not airlocked, clogged or otherwise inoperative. Make sure the gas valve is on and there is sufficient gas pressure in the line.

  • Page 27: Electrical Troubleshooting

    Some electrical components are wired in parallel, so it is necessary to troubleshoot in the order that they To order or purchase parts for the Laars Mighty appear on the wiring diagram or the troubleshooting Max VW heater, contact your nearest Laars contractor flow chart (see Figure 19).
  • Page 28 LAARS Heating Systems Page 28 Item Description Part Number Item Description Part Number 27. Panel, Top Side, Left ........20152800 Sight Glass ............ F0044800 28. Panel, Side, Left ..........20152700 Igniter, Hot Surface ........W0038001 29. Panel, Bottom Side, Left ........ 20152900 10.
  • Page 29 Mighty Max Volume Water Heater Page 29 Front View Right Side View...
  • Page 30 LAARS Heating Systems Page 30 Rear View Front View Left Side View Right Side View...
  • Page 31 Mighty Max Volume Water Heater Page 31...
  • Page 32 1355 Kuehner Drive, Simi Valley, CA 93063 • 800.900.9276 • Fax 800.559.1583 (Sales, Service) 480 S. Service Rd. West, Oakville, Ontario, Canada L6K 2H4 • 905.844.8233 • Fax 905.844.2635 www.Laars.com A subsidiary of BRADFORD WHITE Corporation Litho in U.S.A. © Laars Heating Systems 0602 Document 2064D...

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