Laars Mighty Therm 2 MT2H Installation And Operation Instructions Manual
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Laars Mighty Therm 2 MT2H Installation And Operation Instructions Manual

Hydronic boiler / water heater
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Installation and Operation Instructions
Installation and Operation
Instructions for
M
ighty
Hydronic Boiler
Model MT2H
Water Heater
Model MT2V
Sizes 200, 300, 400
This product must be installed and serviced by a professional service technician,
FOR YOUR SAFETY:
qualified in hot water boiler installation and maintenance. Improper installation and/or operation could
create carbon monoxide gas in flue gases which could cause serious injury, property damage, or
death. Improper installation and/or operation will void the warranty. For indoor installations, as an
additional measure of safety, Laars strongly recommends installation of suitable Carbon Monoxide
detectors in the vicinity of this appliance and in any adjacent occupied spaces.
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.
2
t
herM
®
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
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 1231B

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Summary of Contents for Laars Mighty Therm 2 MT2H

  • 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. General Information SECTION 5. Electrical Connections Introduction ............3 Main Power ............ 24 Model Identification .......... 4 Field Wiring ........... 24 Warranty ............4 SECTION 6. Operating Instructions Dimensions ............4 Locating the Appliance........

  • Page 3: Section 1. General Information

    Where differences detailed in this manual, or the Laars Heating exist between the application of the appliances and Systems warranty may be voided. The...

  • Page 4: Model Identification

    The Model Character Designation owner should fill out the warranty registration card and return it to Laars Heating Systems. 1-3 Model Series Designation All warranty claims must be made to an M T 2 = Mighty Therm2...
  • Page 5 Mighty Therm 2 Page 5 (200, 300, 400) Dimensions shown in inches, cm. Combustion Air Horizontal Vent Connection Model Connection (Cat III) Vent Pipe Size 20.5 26.5 33.6 *Air and vent connections may be on top or back of the Mighty Therm2, and are field convertible. Figure 1A.
  • Page 6 LAARS Heating Systems Page 6 Dimensions shown in inches, cm. Combustion Air Horizontal Vent Connection Model Connection (Cat III) Vent Pipe Size 20.5 26.5 33.6 *Air and vent connections may be on top or back of the Mighty Therm2, and are field convertible.

  • Page 7: Locating Pump-Mounted Water Heater With Respect To Storage Tank(S)

    Mighty Therm 2 Page 7 (200, 300, 400) Intake Side Wall Heater Vent Collar Horizontal Air Collar Max. Pipe Max. No. Side Vent Combustion Size Size Vent Pipe & Pipe Length of Elbows Terminal Air Terminal Diameter Diameter Part Number Part Number CA003101 CA003201...

  • Page 8: Section 2. Venting And Combustion Air

    LAARS Heating Systems Page 8 SECTION 2. Table 3 shows data for this sizing method, for each Mighty Therm2 model. Venting and Combustion Air Method 2: One permanent opening, commencing within 12 inches (30 cm) of the top of the enclosure, WARNING shall be permitted.

  • Page 9: Intake Combustion Air

    Category III system. wall, or through the roof. When taken from the wall, it All Mighty Therm2 vent systems which must be taken from out-of-doors by means of the Laars discharge horizontally (without the use of a power horizontal wall terminal (see Table 1).

  • Page 10: Category Iii Vent

    (pressure) switch, as shipped. However, this 2.3.1 Side Wall Vent Terminal safety switch has only been designed and tested to be The appropriate Laars side wall vent terminal effective in installations where the Mighty Therm2 must be used, and is listed in the installation and is vented separately and NOT common vented with operation manual.
  • Page 11 Mighty Therm 2 Page 11 (200, 300, 400) 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 Direct Vent Only: 12 inches (30 cm) be opened Other Than Direct Vent: 4 feet (1.2 m) below or...
  • Page 12 LAARS Heating Systems Page 12 gravity inlets or other openings. Whenever gasfitter shall observe that a battery operated or possible, locations under windows or near doors hard-wired carbon monoxide detector with an should be avoided. alarm is installed on each additional level of the...

  • Page 13: Side Wall Combustion Air Terminal

    Seal any unused openings in the common venting system. 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...

  • Page 14: Vent Terminals For Outdoor Units

    Sceller toutes les ouvertures non utilisées du If local codes allow, Laars kits are not required système d'évacuation. for outdoor units. The installer may use 12" of Inspecter de façon visuelle le système appropriately sized galvanized single wall or b-type d'évacuation pour déterminer la grosseur et...

  • Page 15: Section 3. Gas Supply And Piping

    Mighty Therm 2 Page 15 (200, 300, 400) applicable codes. Locate and install manual shutoff valves in Model (Size) Outdoor Vent and accordance with state and local requirements. Air Terminal Kit A sediment trap must be provided upstream of CA003001 the gas controls.

  • Page 16: Section 4A. Water Connections

    LAARS Heating Systems Page 16 gravity circulation of the boiler water during the NOTE: The Mighty Therm2 appliance and all other cooling cycle. gas appliances sharing the gas supply line must A boiler installed above radiation level, or as be firing at maximum capacity to properly measure required by the authority having jurisdiction, must be the inlet supply pressure.
  • Page 17 Mighty Therm 2 Page 17 (200, 300, 400) Model 20°F 25°F 30°F 35°F (Size) flow flow flow flow feet feet feet feet Metric Equivalent IMPORTANT NOTES: Different glycol products Model 11°C 14°C 17°C 19°C may provide varying degrees of protection. (Size) flow flow...
  • Page 18 LAARS Heating Systems Page 18 Figure 5. Hydronic Piping — Multiple Boilers, Low Temperature System. Figure 6. Hydronic Piping — One Boiler, Multi-Temperature System.
  • Page 19 Mighty Therm 2 Page 19 (200, 300, 400) Figure 7. Hydronic Piping — Primary-Secondary, Reverse-Return. Figure 8. Hydronic Piping — Primary-Secondary, Reverse-Return, Low Temperature.

  • Page 20: Water Heater

    Contact a quality of the installation. Laars representative if you have questions or concerns Pipe the outlet from the heater’s relief valve about water quality.

  • Page 21: Freeze Protection - Water Heater

    This can result in bursting of pipes in the system, or damage to the heater, which could result in leaking or flooding conditions. Contact the local factory representative or Laars for additional information. Model Temp Rise °F Temp.
  • Page 22 LAARS Heating Systems Page 22 KEY: WATER CATEGORY GRAIN HARDNESS PER GALLON S = SOFT 1 THROUGH 7.5 N = NORMAL 7.6 THROUGH 17 H = HARD OVER 17 PPM / 17.1 = Grains Per Gallon CAUTION: THIS DRAWING SHOWS SUGGESTED...
  • Page 23 Mighty Therm 2 Page 23 (200, 300, 400) CAUTION: THIS DRAWING SHOWS SUGGESTED KEY: PIPING CONFIGURATION AND VALVING, CHECK WATER CATEGORY WITH LOCAL CODES AND ORDINANCES FOR GRAIN HARDNESS PER GALLON ADDITIONAL REQUIREMENTS. S = SOFT 1 THROUGH 7.5 N = NORMAL 7.6 THROUGH 17 OVER 17 H = HARD...
  • Page 24 LAARS Heating Systems Page 24 Figure 15. Wiring Diagram, Boiler or Water Heater.

  • Page 25: Section 5. Electrical Connections

    Mighty Therm 2 Page 25 (200, 300, 400) SECTION 5. Electrical Connections Single pole switches, including those of safety controls and protective devices must not be wired in a 120 VAC POWER grounded line. MAIN PWR SW HSI IGNITOR 120 VAC NOTE: All internal electrical components have been IGN CTL IGN CTL...

  • Page 26: Section 6. Operating Instructions

    LAARS Heating Systems Page 26 SECTION 6. energized, attempting to light, for seven (7) seconds, and then will de-energize. The unit will Operating Instructions attempt to light two more times, and then will go into lockout mode. Second, turn the power off 6.1 Filling the Boiler System...
  • Page 27 Off there is no post purge of the pump, the pump turns 3. Boiler target = 70 deg F + RR x (70 deg F - off immediately after the last call is removed. Laars outdoor temp) strongly recommends using a pump post purge. During...

  • Page 28: External Boiler Operations

    LAARS Heating Systems Page 28 differential/2. pressure switch senses the pressure in the exhaust 2. Target Max - The boiler target maximum is plenum. This switch opens if the pressure is excessive the point at which the stages will start to turn off to (as an indicator of a blocked vent).

  • Page 29: Operating The Burner And Set Up

    Mighty Therm 2 Page 29 (200, 300, 400) blower off. Three attempts to light will follow. Ignition will not occur as the gas is off. The ignition control will lockout, and will have to be 6.6 Operating the Burner and Set-Up reset by cycling the power before the unit 6.6.1 Set-Up for 0 to 2500 Feet Altitude will operate.

  • Page 30: Shutting Down The Mighty Therm2

    Component Description power. Burner will go through a pre-purge period and Only genuine Laars replacement parts should be used. ignitor warm-up period, followed by ignition. Caution Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation.

  • Page 31: Burners

    Mighty Therm 2 Page 31 (200, 300, 400) Pump (if required) panel in front of the blower. The probe is in the outlet Relays side of the header. Flow switch To reset the switch, unscrew the black cover that Gas train is over the reset button, and push the button.

  • Page 32: Heat Exchanger Coil

    LAARS Heating Systems Page 32 off the 120-volt power to the appliance. Isolate the Disconnect the electrical supply to the unit. boiler or water heater from the system by closing the Turn off the gas supply by closing the manual gas isolation valves.

  • Page 33: Section 8. Trouble Shooting

    Trouble Shooting necessary to install a buffer tank in the system. Contact your Laars representative to discuss possible remedies. 8.1 Resolving Lockouts There are many causes of lockouts. The three 8.4 Short Cycling — Water Heater...

  • Page 34: Section 9. Replacement Parts

    Only genuine Laars replacement parts should be used. 9.1 General Information To order or purchase parts for the Laars Mighty Therm2, 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 35 Mighty Therm 2 Page 35 (200, 300, 400) Item Description Model 200 Model 300 Model 400 JACKET COMPONENTS See Figure 21 Panel, Front, Jacket R2C3320 R3C3320 R4C3320 Panel, Rear, Jacket 2C3220 3C3220 4C3220 Panel, Top, Jacket 2C3021 3C3021 4C3021 Panel, Jacket, Control Access 2F3019 3F3019 4F3019...
  • Page 36 LAARS Heating Systems Page 36 Item Description Model 200 Model 300 Model 400 GAS TRAIN COMPONENTS See Figure 23 Weldment, Gas Manifold, Main L0063702 L0063703 L0063704 Manifold, Gas, On/Off L0063414 L0063416 L0063418 Manifold, Gas, 2 Stage Left Bank L0063404 L0063413 L0063414 Manifold, Gas, 2 Stage Right Bank...
  • Page 37 Mighty Therm 2 Page 37 (200, 300, 400) Figure 20. Combustion Chamber Components.
  • Page 38 LAARS Heating Systems Page 38 Figure 21. Jacket Components.
  • Page 39 Mighty Therm 2 Page 39 (200, 300, 400) Figure 22. Heat Exchanger Components.
  • Page 40 LAARS Heating Systems Page 40 ON/OFF 2 STAGE Figure 23. Gas Train Components.
  • Page 41 Mighty Therm 2 Page 41 (200, 300, 400) Figure 24. Control Panel Components.
  • Page 42 800.900.9276 • 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 1209 Document 1231B...

This manual is also suitable for:

Mighty therm 2 mt2v 200Mighty therm 2 mt2v 300Mighty therm 2 mt2v 400Mighty therm 2Mt2hMt2v

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