Laars Mighty Stack MS-080 Operating Instructions Manual
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Laars Mighty Stack MS-080 Operating Instructions Manual

Laars Mighty Stack MS-080 Operating Instructions Manual

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Installation and Operation Instructions
Installation and Operation
Instructions for
Mighty Stack
Water Heater
Model MS-080
Sizes 199, 300, 399
This product must be installed and serviced by a professional service technician,
FOR YOUR SAFETY:
qualified in hot water 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. For indoor installations, as an
additional measure of safety, Laars strongly recommends installation of suitable Carbon Monoxide
detectors in the vicinity of this appliance and in any adjacent occupied spaces.
WARNING
If the information in this manual is not
followed exactly, a fire or explosion may
result causing property damage, personal
injury or loss of life.
Do not store or use gasoline or other
flammable vapors and liquids in the vicinity of
this or any other appliance.
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do not
use any phone in your building.
• Immediately call your gas supplier from
a nearby phone. Follow the gas supplier's
instructions.
• If you cannot reach your gas supplier, call
the fire department.
Installation and service must be performed
by a qualified installer, service agency, or gas
supplier.
™
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
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 2155
AVERTISSEMENT

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Summary of Contents for Laars Mighty Stack MS-080

  • Page 1 Improper installation and/or operation will void the warranty. For indoor installations, as an additional measure of safety, Laars strongly recommends installation of suitable Carbon Monoxide detectors in the vicinity of this appliance and in any adjacent occupied spaces.

  • Page 2: Table Of Contents

    Laars Heating Systems Page 2 TABLE OF CONTENTS SECTION 1. SECTION 6. General Information Operating Instructions Introduction ............3 Filling the Water Heater System ....20 Model Identification .......... 4 Operating Temperature Control ..... 20 Warranty ............4 External Water Heater Operations ....20 Dimensions ............

  • Page 3: General Information

    Jurisdiction (AHJ), or 2) In Canada, the "Natural Gas and Propane à défaut de quoi la garantie fournie par Laars Heating Systems serait annulée. L’installation doit Installation Code", CSA B149.1, latest edition and all être conforme aux exigences de la réglementation...

  • Page 4: Model Identification

    The owner should and there is potential for snow accumulation in the go to the Laars.com website and register for warranty. local area, both terminals should be installed at an All warranty claims must be made to an...
  • Page 5 Mighty Stack Page 5 Size 33.0 8.75 39.0 43.0 *Air and vent connections may be on top or back of the Mighty Stack, and are field convertible. Figure 1. Dimensional Data.

  • Page 6: Locating Appliance For Correct Horizontal Vent/Ducted Air Distance From Outside Wall

    Laars Heating Systems Page 6 1.6 Locating Appliance for Correct NOTE: When located on the same wall, the Mighty Stack combustion air intake terminal must Horizontal Vent/Ducted Air Distance be installed a minimum of 12" (30cm) below the From Outside Wall...

  • Page 7: Venting And Combustion Air

    For indoor installations, as an additional measure or spaces that directly communicate with the outdoors of safety, Laars strongly recommends installation of and shall have a minimum free area of 1 square inch suitable Carbon Monoxide detectors in the vicinity of per 3000 Btu/hr (7 square cm/kW) of the total input this appliance and in any adjacent occupied spaces.

  • Page 8: Intake Combustion Air

    The combustion air can be ducted through the wall, or through the roof. When taken from the wall, it system. must be taken from out-of-doors by means of the Laars All Mighty Stack vent systems which discharge horizontally (without the use of a power venter) are horizontal wall terminal (see Table 1).

  • Page 9: Category Iii Vent

    Propane Installation Code (CSA B149.1) as 2.3.1 Side Wall Vent Terminal well as all applicable local codes, it is required that The appropriate Laars side wall vent terminal installers provide some means to prevent operation must be used, and is listed in the installation and with a blocked common vent.
  • Page 10 Laars Heating Systems Page 10 U.S. Installations (see note 1) Canadian Installations (see note 2) A= Clearance above grade, veranda, porch, 12 inches (30 cm) 12 inches (30 cm) deck, or balcony B= Clearance to window or door that may...
  • Page 11 Mighty Stack Page 11 on the same wall, locate the vent terminal at least completion of installation, the owner shall 3 feet (0.9m) horizontally from the combustion have a period of thirty (30) days to comply air terminal, and locate the vent terminal at least with the above requirements;...

  • Page 12: Side Wall Combustion Air Terminal

    2.3.2 Side Wall Combustion Air Terminal Visually inspect the venting system for proper The Laars side wall combustion air terminal size and horizontal pitch and determine there is (listed in Table 1) must be used when the unit takes non blockage or restriction, leakage, corrosion its combustion air through a duct from a side wall.

  • Page 13: Vent Terminals For Outdoor Units

    Inspecter de façon visuelle le système If local codes allow, Laars kits are not required d'évacuation pour déterminer la grosseur et for outdoor units. The installer may use 12" (30cm) of l'inclinaison horizontale qui conviennent et appropriately sized galvanized single wall or b-type s'assurer que le système est exempt d'obstruction,...
  • Page 14 Laars Heating Systems Page 14 Figure 4. Venting.

  • Page 15: Gas Supply And Piping

    Mighty Stack Page 15 SECTION 3. The appliance and its individual shutoff valve must be disconnected from the gas supply piping Gas Supply and Piping during any pressure testing of that system at test pressures in excess of 0.5 psig (3.45 kpa). 3.1 Gas Supply and Piping The unit must be isolated from the gas supply Gas piping should be supported by suitable...

  • Page 16: Water Connections

    120°F. an anti-scald mixing or tempering valve shall be installed to temper the water for those uses in order NOTE: Laars will not warranty claims for failure to to reduce scald hazard potential. provide minimum return water temperature.
  • Page 17 Mighty Stack Page 17 Figure 4. Suggested Plumbing. Figure 5. Suggested Plumbing, Three Units (in first, out last).

  • Page 18: Electrical Connections

    Laars Heating Systems Page 18 SECTION 5. Electrical Connections WARNING The appliance must be electrically grounded in accordance with the requirements of the authority having jurisdiction or, in the absence of such requirements, with the latest edition of the National Electrical Code, ANSI/NFPA 70, in the U.S.
  • Page 19 Mighty Stack Page 19 Figure 7. Wiring Diagram, ON/OFF Water Heater.

  • Page 20: Operating Instructions

    Laars Heating Systems Page 20 SECTION 6. on the MS-080 will no longer have control of the unit. The 24V from the unit waits at the input terminal, and Operating Instructions the external control switches this 24V from the input.

  • Page 21: Operating The Burner And Set-Up

    Mighty Stack Page 21 on PSW, the control begins a pre-purge and a normal trial for ignition. If the PSW signal is lost while the Mighty Stack is firing, the control will immediately de-energize the gas valve terminal (MV). The blower will remain on for the post-purge period (45 seconds), and the control will continue to monitor the PSW input.

  • Page 22: High Altitude Adjustment And Set-Up

    Laars Heating Systems Page 22 After placing the appliance in operation, the 6.7 Shutting Down the Mighty Stack Burner Safety Shutoff Device must be tested. Switch off the main electrical disconnect switch. To test: Close all manual gas valves. Close gas shutoff valve with burner If freezing is anticipated, drain the Mighty Stack operating.

  • Page 23: Maintenance

    Inspect the air filter monthly, or more often in dirty environments. If there Only genuine Laars replacement parts should be used. is debris on the air filter, remove it from the filter frame, and wash it with mild soap and water. Ensure Caution that the filter is completely dry before reinstalling.

  • Page 24: Manual Reset High Limit Control

    Laars Heating Systems Page 24 7.2.4 Manual Reset High Limit Control 7.2.8 Flow Switch The high limit switch is a manual reset, non- The Mighty Stack uses a paddle-type flow switch adjustable switch with a remote bulb-type sensor. to ensure that the unit has water flow before ignition is Switches are set at 200°F (93°C).The control is located...
  • Page 25 Mighty Stack Page 25 sensors from all components that are attached to the inlet/outlet header. Isolate the heat exchanger from the water supply. Disconnect the header flanges from the inlet and outlet. Allow the heat exchanger to drain. Remove the venting and remove the top, by removing the screws that attach the top to the side panels.

  • Page 26: Trouble Shooting

    Laars Heating Systems Page 26 SECTION 8. 8.2 Delayed Ignition — Possible Causes A defective burner can cause a delayed ignition. Trouble Shooting If the gas supply pressure is proper and the gas valves are functioning properly, then burners should 8.1 Resolving Lockouts...

  • Page 27: Replacement Parts

    9.1 General Information To order or purchase parts for the Laars Mighty Stack, contact your nearest Laars dealer or distributor. If they cannot supply you with what you need, contact Customer Service (see back cover for address, telephone and fax numbers).
  • Page 28 Laars Heating Systems Page 28 Item Description Size 199 Size 300 Size 399 JACKET COMPONENTS See Figure 10 Assembly, Base/Support 20L1000 30L1000 40L1000 Weldment, Base, Upper Level 20L1200 30L1200 40L1200 Support, Corner (4 req'd) 40L2001 40L2001 40L2001 Support, Corner 40L2002 40L2002 40L2002...
  • Page 29 Mighty Stack Page 29 Item Description Size 199 Size 300 Size 399 CONTROL PANEL COMPONENTS See Figure 13 Switch, Pressure, Diaphragm, SPST E0255500 E0255500 E0255500 Switch, Pressure, Diaphragm, SPDT E0240900 E0240900 E0240900 Switch, Limit, High Temperature, Volume Water E2324200 E2324200 E2324200 Transformer, 24, 120V, 50VAC E0180500 E0180500 E0180500...
  • Page 30 Laars Heating Systems Page 30 Figure 9. Combustion Chamber Components.
  • Page 31 Mighty Stack Page 31 Figure 10. Jacket Components.
  • Page 32 Laars Heating Systems Page 32 Figure 11. Heat Exchanger Components.
  • Page 33 Mighty Stack Page 33 Figure 12. Gas Train Components.
  • Page 34 Laars Heating Systems Page 34 Figure 13. Control Panel Components.
  • Page 35 Mighty Stack Page 35 Figure 14. Pump Assembly Components.
  • Page 36 800.900.9276 • Fax 800.559.1583 (Customer Service, Service Advisors) 20 Industrial Way, Rochester, NH 03867 • 603.335.6300 • Fax 603.335.3355 1869 Sismet Road, Mississauga, Ontario, Canada L4W 1W8 • 905.238.0100 • Fax 905.366.0130 www.Laars.com Litho in U.S.A. © Laars Heating Systems 1110 Document 2155...

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