Laars MIGHTY THERM2 MT2H Installation And Operation Instruction Manual
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Laars MIGHTY THERM2 MT2H Installation And Operation Instruction Manual

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Installation and Operation Instructions
Installation and Operation
Instructions for
MIGHTY THERM2
Hydronic Boiler
Model MT2H
Sizes 300, 400
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.
®
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 1231E
AVERTISSEMENT

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Summary of Contents for Laars MIGHTY THERM2 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 ....3 SECTION 5 Electrical Connections ..24 Introduction ..........3 Main Power ..........24 Model Identification ........4 Field Wiring ..........24 Warranty ............ 4 Low Water Cut-Off ........24 Dimensions ..........

  • Page 3: Section 1 General Information

    Devices for Automatically Fired Boilers, ANSI/ for the installation, operation, and maintenance of ASME CSD-1. Any modifications to the boiler, Laars Heating Systems’ Mighty Therm2 copper tube its gas controls, or wiring may void the warranty. appliances, sizes 200-400 MBTU/hr (larger models are If field conditions require modifications, consult covered in a separate manual).

  • Page 4: B Model Identification

    The owner should fill out the warranty registration Model Character Designation card and return it to Laars Heating Systems. All warranty claims must be made to an 1-3 Model Series Designation...
  • Page 5 Mighty Therm 2 (200, 300, 400) Install & Operating Page 5 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 the top or back of this appliance, and are field convertible. Figure 1.
  • 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 the top or back of this appliance, and are field convertible.

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

    Mighty Therm 2 (200, 300, 400) Install & Operating Page 7 Intake Max. Side Wall Heater Vent Collar Horizontal Air Collar Min. Min. Vent Intake / Max. No. Side Vent Combustion Size Size Vent Pipe & Pipe Intake Length Vent of Elbows Terminal Air Terminal...

  • Page 8: Section 2 Venting And Combustion Air

    LAARS Heating Systems Page 8 SECTION 2 Venting and boiler or water heater. Combustion Air Method 2: One permanent opening, commencing within 12 inches (30 cm) of the top of the enclosure, WARNING shall be permitted. The opening shall directly...

  • Page 9: Intake Combustion Air

    Mighty Therm 2 (200, 300, 400) Install & Operating Page 9 2.A.2 Intake Combustion Air The combustion air can be taken through the includes rules and tables to size these vent systems. If wall, or through the roof. When taken from the wall, this appliances vertical vent system does not satisfy it must be taken from out-of-doors by means of the the criteria for Category I venting, it must be vented as...

  • Page 10: Category Iii Vent

    LAARS Heating Systems Page 10 connected to a common vent cannot be assured, WARNING including prevention of spillage of flue gases into Operation of appliances with a blocked common living spaces, common venting should not be applied, vent may lead to serious injury or death. Safety and appliances should each be vented separately.
  • Page 11 Mighty Therm 2 (200, 300, 400) Install & Operating Page 11 Canadian Installations 1 U.S. Installations 2 A = Clearance above grade, veranda, porch, deck, or balcony B = Clearance to window or door that may be ● 6 in (15 cm) for appliances ≤ 10,000 Btuh (3 kW) ●...
  • Page 12 LAARS Heating Systems Page 12 enter the building through doors, windows, gravity shall observe that a battery operated or hard- inlets or other openings. Whenever possible, wired carbon monoxide detector with an alarm is locations under windows or near doors should be installed on each additional level of the dwelling, avoided.

  • Page 13: Side Wall Combustion Air Terminal

    Mighty Therm 2 (200, 300, 400) Install & Operating Page 13 4. If the appliance is side-wall vented to the same (c) MANUFACTURER REQUIREMENTS – wall, locate the vent terminal at least 3 feet (0.9m) GAS EQUIPMENT VENTING SYSTEM horizontally from the combustion air terminal, PROVIDED.

  • Page 14: E Vent Terminals For Outdoor Units

    LAARS Heating Systems Page 14 Adjust thermostat so appliance will operate Mettre l'appareil inspecté en marche. Suivre les continuously. instructions d'allumage. Réegler le thermostat de Test for spillage at the draft hood relief opening façon continue. after 5 minutes of main burner operation. Use Faire fonctionner le brûleur principal pendant...

  • Page 15: Section 3 Gas Supply And Piping

    Mighty Therm 2 (200, 300, 400) Install & Operating Page 15 SECTION 3 Gas Supply and Piping 3.A Gas Supply and Piping The appliance and its individual shutoff valve Gas piping should be supported by suitable must be disconnected from the gas supply piping hangers or floor stands, not by the appliance.

  • Page 16: Section 4 Water Connections

    LAARS Heating Systems Page 16 SECTION 4 Water Connections — 4.A Boiler 4.A.1 Heating System Piping: 4.A.3 Water Flow Requirements — Boiler Hot Supply Connections — Boiler A hydronic heating (closed loop) application NOTE: This appliance must be installed in a closed recirculates the same fluid in the piping system.

  • Page 17: B Water Connections - Water Heater

    Mighty Therm 2 (200, 300, 400) Install & Operating Page 17 4.B Water Connections — Water Heater Model 20°F 25°F 30°F 35°F (Size) flow flow flow flow 4.B.1 Water System Piping — Water Heater feet feet feet feet Hot water piping should be supported by suitable hangers or floor stands.
  • Page 18 LAARS Heating Systems Page 18 Figure 6. Hydronic Piping — Multiple Boilers, Low Temperature System. Figure 7. Hydronic Piping — One Boiler, Multi-Temperature System.
  • Page 19 Mighty Therm 2 (200, 300, 400) Install & Operating Page 19 Figure 8. Hydronic Piping — Primary-Secondary, Reverse-Return. Figure 9. Hydronic Piping — Primary-Secondary, Reverse-Return, Low Temperature.

  • Page 20: Hot Water Supply Piping -Water Heater

    LAARS Heating Systems Page 20 4.B.4 Combined Water Heating (potable) and 4.B.2 Hot Water Supply Piping —Water Space Heating — Water Heater Heater Follow the tank manufacturer’s guidelines for completion of the hot water system connections. NOTE: These systems are not allowed in the NOTE: A listed temperature and pressure relief Commonwealth of Massachusetts.
  • Page 21 Mighty Therm 2 (200, 300, 400) Install & Operating Page 21 Model Temp Rise °F Temp. Rise °C (Size) Notes: 1. S = soft water (1 to 7.5 grains hardness) 2. N = normal water (7.6 to 17 grains hardness) 3.
  • 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 (200, 300, 400) Install & Operating Page 23 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 H = HARD...

  • Page 24: Section 5 Electrical Connections

    LAARS Heating Systems Page 24 SECTION 5 Electrical Connections WARNING The appliance must be electrically grounded in Single pole switches, including those of safety accordance with the requirements of the authority controls and protective devices must not be wired in a having jurisdiction or, in the absence of such grounded line.

  • Page 25: Logic Diagrams

    Mighty Therm 2 (200, 300, 400) Install & Operating Page 25 Logic Diagrams. 120 VAC MAIN PWR SW HSI IGNITOR 120 VAC 120 VAC POWER MAIN PWR SW HSI IGNITOR IGN CTL IGN CTL IGN CTL IGN CTL 120 VAC IGN/120 IGN/FS IGN CTL...

  • Page 26: Wiring Diagrams

    LAARS Heating Systems Page 26 Wiring Diagrams. Figure 16. Wiring Diagram, Boiler.
  • Page 27 Mighty Therm 2 (200, 300, 400) Install & Operating Page 27 Figure 17. Wiring Diagram, Volume Water Heater.

  • Page 28: Section 6 Operating Instructions

    LAARS Heating Systems Page 28 SECTION 6 Operating Instructions attempt to light two more times, and then will go into lockout mode. Second, turn the power off and then on again, open the manual gas valve 6.A Filling the Boiler System and allow the unit to light.

  • Page 29: Temp Control On Boilers

    Mighty Therm 2 (200, 300, 400) Install & Operating Page 29 LEDs State Description Auto Boiler Target Setpoint: Space Heating: 1. Power The boiler target temperature is automatically 2. Heat – On = call for heat; Flashes for Boiler determined from Space Heating and DHW sensor error requirements.

  • Page 30: Temp Control On Water Heaters

    LAARS Heating Systems Page 30 differential/2. terminals. 2. Target Max - The boiler target maximum is 2. Install the sensor into a well in the location used to the point at which the stages will start to turn off to control water temperature.

  • Page 31: D Sequence Of Operation

    Mighty Therm 2 (200, 300, 400) Install & Operating Page 31 If there is a call for stage 2 on a 2-stage unit, that valve will be energized. If there is a loss of flame signal during a successful firing sequence, the ignition control will remove power from the gas valves, and then attempt to light up to two more times.

  • Page 32: High Altitude Adjustment And Set-Up

    LAARS Heating Systems Page 32 4. Switch on the appliance power switch located on the right side of the unit. 5. The appliance will enter the start sequence, as long Supply Manifold as the unit is being called for heat. The blower and...

  • Page 33: G Shutting Down The Unit

    Mighty Therm 2 (200, 300, 400) Install & Operating Page 33 SECTION 7 Maintenance 7.A System Maintenance 6.G Shutting Down the Unit Lubricate the system water-circulating pump, if Switch off the main electrical disconnect switch. required, per the instructions on the pump. Close all manual gas valves.

  • Page 34: Burners

    LAARS Heating Systems Page 34 joints should be coated with piping compound resistant The gas and electric controls on the appliance to action of liquefied petroleum gas), and reinstall in are engineered for long life and dependable operation, reverse order. Turn on manual gas shutoff valve and...

  • Page 35: Transformer

    Mighty Therm 2 (200, 300, 400) Install & Operating Page 35 7.B.7 Transformer screws that attach the top to the side panels. This appliance’s transformer is not capable of Remove the side panels. supplying control voltage for external devices such Remove the heat exchanger from the unit.

  • Page 36: Section 8 Trouble Shooting

    LAARS Heating Systems Page 36 SECTION 8 Trouble Shooting 8.C Short Cycling — Boiler Boiler short cycling is caused when the load 8.A Resolving Lockouts on the boiler system swings rapidly causing frequent cycling between call for heat and satisfied conditions.

  • Page 37: Section 9 Replacement Parts

    Mighty Therm 2 (200, 300, 400) Install & Operating Page 37 SECTION 9 Replacement Parts Only genuine manufacturer's replacement parts should be used. 9.A General Information To order or purchase parts for the this boiler or water heater, contact your nearest manufacturer's dealer or distributor.
  • Page 38 LAARS Heating Systems Page 38 Item Description Model 200 Model 300 Model 400 JACKET COMPONENTS See Figure 20 Panel, Front, Jacket R2C3320 R3C3320 R4C3320 Panel, Rear, Jacket 2C3220 3C3220 4C3220 Panel, Top, Jacket 2C3021 3C3021 4C3021 Panel, Jacket, Control Access 2F3019 3F3019...
  • Page 39 Mighty Therm 2 (200, 300, 400) Install & Operating Page 39 Item Description Model 200 Model 300 Model 400 GAS TRAIN COMPONENTS See Figure 22 Weldment, Gas Manifold, Main L0063702 L0063703 L0063704 Manifold, Gas, On/Off L0063414 L0063416 L0063418 Manifold, Gas, 2 Stage Left Bank L0063404 L0063413 L0063414...
  • Page 40 LAARS Heating Systems Page 40 Figure 19. Combustion Chamber Components.
  • Page 41 Mighty Therm 2 (200, 300, 400) Install & Operating Page 41 Figure 20. Jacket Components.
  • Page 42 LAARS Heating Systems Page 42 Boiler Emersion Well This Side Volume Water Heater Emersion Well This Side Figure 21. Heat Exchanger Components.
  • Page 43 Mighty Therm 2 (200, 300, 400) Install & Operating Page 43 ON/OFF 2 STAGE Figure 22. Gas Train Components.
  • Page 44 800.900.9276 • Fax 800.559.1583 Customer Service and Product Support: Industrial Way, Rochester, NH, USA 03867 • 603.335.6300 • Fax 603.335.3355 Headquarters: 9 Brigden Gate, Halton Hills, Ontario, Canada L7G 0A3 • 905.203.0600 • Fax 905.636.0666 www.Laars.com Litho in U.S.A. © Laars Heating Systems 20-12 Document 1231E...

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