Laars Mascot II Installation And Operation Instructions Manual
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Laars Mascot II Installation And Operation Instructions Manual

Modulating boiler and combination boiler and water heater
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Installation and Operation Instructions
FOR YOUR SAFETY: This product must be installed and serviced by a professional service technician,
qualified in hot water boiler and 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.
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.
Installation and Operation
Instructions for
Mascot
II
®
Modulating Boiler
Model LMH
125 MBTU/h
Combination
Boiler and Water Heater
Model LMC
125 MBTU/h
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 1230A

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  • Page 1 Installation and Operation Instructions Document 1230A Installation and Operation Instructions for Mascot ® Modulating Boiler Model LMH 125 MBTU/h Combination Boiler and Water Heater Model LMC 125 MBTU/h FOR YOUR SAFETY: This product must be installed and serviced by a professional service technician, qualified in hot water boiler and heater installation and maintenance.

  • Page 2: Table Of Contents

    8.8.2 Lead Lag Master / Slave Selection ....29 Pump Capacity 8.8.3 Lead Lag Address ........... 29 5.1 Mascot II Heating System Pump Capacity ... 17 8.8.4 Lead Lag Hysteresis ........29 8.8.5 Lead Lag Base Load Setting ......29...
  • Page 3 10.1 Filling the Boiler System ........32 10.2 Operating the Burner and Set Up ....32 10.2.1 Burner Operation ..........32 10.2.2 Boiler Setup and Adjustment ......33 10.3 Shutting Down Mascot II ........33 10.4 To Restart Mascot II ......... 33 SECTION 11. Maintenance 11.1...

  • Page 4: General Information

    Mascot II is protected against over pressurization. 1.4 Warranty A pressure relief valve is included with each Mascot II. The PRV should be installed prior to filling the system. LAARS Heating Systems’ Mascot II appliances Refer to Figures 1 and 2 for PRV locations.

  • Page 5: Unpacking

    The carrier, not the shipper, is responsible for shortages and damage to the shipment whether visible or concealed. 1.5 Unpacking The Mascot II is shipped in a single crate with the following standard components packed with the appliance (see Figure 2"...
  • Page 6 LAARS Heating Systems Page 6 Figure 2. Location of Components.
  • Page 7 Mascot II Boilers and Water Heaters Page 7 Cond. Hydronic Hydronic Outlet Return Inlet Return Supply Supply Outlet Supply 3/4" 3/4" 1/2" 3/4" 1/2" 3/4" 1/2" 3/4" copper copper copper Figure 3. Dimensional Drawing.

  • Page 8: Locating The Appliance

    Table 2 are followed. appliance should be chosen with regard to the vent pipe NOTE: When located on the same wall, the Mascot II lengths and external plumbing and on a level surface. combustion air intake terminal must be installed a The unit shall be installed such that the gas ignition minimum of 12"...
  • Page 9 Figure 5. Mounting Detail. NOTE: Mascot II models include 16" on-center mounting holes on upper rear of boiler jacket. These holes are not identified on the mounting template. If mounting conditions are appropriate, the installer may opt to use this alternative method in lieu of the standard wall bracket depicted.

  • Page 10: Venting And Combustion Air

    This opening must A Mascot II unit can take combustion air from not be less than the sum of the areas of all vent the space in which it is installed, or the combustion connectors in the confined space.

  • Page 11: Venting (Exhaust)

    1/4" per foot, so that condensate application of the boiler to determine the required will run back to the Mascot II to drain. Route vent pipe certified vent class. If the Mascot II is installed in an to the heater as directly as possible.

  • Page 12: Side Wall Vent Terminal

    IMPORTANT NOTE ABOUT COMMON VENTING: A Locate the terminal so the vent exhaust does not single vent that is shared by multiple Mascot II units settle on building surfaces or other nearby objects. Vent products may damage surfaces or objects.
  • Page 13 Mascot II Boilers and Water Heaters Page 13 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 See note 6 See note 6 B= Clearance to window or door that may be Direct vent only: 12 inches (30cm);...

  • Page 14: Installations In The Commonwealth Of Massachusetts

    3.4 Common Vent Test NOTE: This section does not describe a method for common venting Mascot II units. It describes what must be done when a unit is removed from a common vent system. Mascot II units require special vent systems and fans for common vent.
  • Page 15 Mascot II Boilers and Water Heaters Page 15 following steps shall be followed with each appliance remaining connected to the common venting system placed in operation, while the other appliances remaining connected to the common venting system are not in operation.

  • Page 16: Gas Supply And Piping

    Verify that the appliance is fitted for the proper type of work. Verify gas inlet pressure is between 4 and 13 in W.C. before gas by checking the rating plate. Mascot II will starting boiler. function properly without the use of high altitude Table 6A.

  • Page 17: Pump Capacity

    ONLY serves the boiler. Mascot II boiler must be located within 15 feet (4.6m) of the supply and return header (or the hydraulic separator). The pump is sized for a maximum of 30 feet (9.1m) of piping and the headloss of the boiler only...

  • Page 18: Freeze Protection

    6.3 Freeze Protection between 20% and 35% glycol. Typically, this Mascot II units are certified for indoor use only, concentration will serve as burst protection for and are not design-certified for placement outdoors. temperatures down to approximately -5°F (-20°C). If Proper precautions for freeze protection are temperatures are expected to be lower than -5°F (-...

  • Page 19: Suggested Piping Schematics

    Use of flow restrictor is optional to prevent colder Figures 13 through 19 show suggested piping water at excessive flow rates. Contact Laars for alternate configurations for Mascot II boilers. These diagrams are configurations. only meant as a guide. All components or piping 6.6.2 Indirect Water Heater Piping (LMH)
  • Page 20 16°C 21°C Mascot II application: TEMP RISE °C Honeywell AM100-US-1 Contact Laars for additional recommended models. Table 8. DHW and Pump Performance Data. Installer to provide and install (anti-scald) thermostatic mixing valve. Figure 15. Hydronic Piping — Low temp system.
  • Page 21 Mascot II Boilers and Water Heaters Page 21 Figure 16. Hydronic Piping — Multi boilers for large homes with long / multiple baseboard zones.
  • Page 22 LAARS Heating Systems Page 22 Figure 17. Hydronic Piping — Multi boilers for large homes with long / multiple radiant zones.
  • Page 23 Mascot II Boilers and Water Heaters Page 23 Figure 18. Hydronic Piping — Heating zones piped with zone pumps.
  • Page 24 LAARS Heating Systems Page 24 Figure 19. Hydronic Piping — Heating zones piped with zone valves.

  • Page 25: Electrical Connections

    4mA as a signal to shut off. If the call for heat is not connected between the field interlock terminals, Mascot II will remain in low fire when it sees 4mA as a 7.8 External Control Connections modulating signal.

  • Page 26: Wiring Diagrams

    LAARS Heating Systems Page 26 port 1 (MB1) terminal A of the first boiler to Modbus port 1 (MB1) terminal A of the second boiler. If there are more boilers in the system connect a wire from Modbus port 1 terminal A of boiler 2 to Modbus port 1 terminal A of boiler 3.
  • Page 27 Mascot II Boilers and Water Heaters Page 27 Figure 22. Wiring Diagram.

  • Page 28: Display Navigation

    Control Setup and Operation DIAGNOSTIC mode is accessed by holding the NEXT button for 3 seconds. The Mascot II control is an integrated electronic control that replaces many of the individual components 8.2 Ignition Control- Sequence of Events found on older appliances. The control acts as the...

  • Page 29: Modulation Control

    The control will automatically reduce the firing of the boiler. If the lead lag setpoint is adjusted to 120°F with Mascot II to prevent the high limit from tripping. The a hysteresis value of 5°F the boiler will turn off when high limit setpoint is not adjustable.

  • Page 30: Modes Of Operation

    "Outlet water temperature setpoint" installation. The following sections describe the basic plus "CH off differential" operation of the Mascot II in each of the different DHW on Burner demand begins when the 2°F modes.

  • Page 31: Hydronic Heating Using Local Lead-Lag/Cascading Feature

    (load increases), then the two boilers will Lag/Cascading Feature increase firing rate together. At 50%, Slave2 will When using single or multiple Mascot II's in lead- begin its firing sequence and be added to the lag configuration, the system sensor is used to monitor group.

  • Page 32: Operating Instructions

    If ignition doesn’t the highest point in the circulating loop, then the occur, turn off the Mascot II, check that there is system is ready for operation.

  • Page 33: Boiler Setup And Adjustment

    Measure the CO in the flue products at high fire. Set the temperature controller to the desired The Mascot II can be forced to high fire to allow temperature setting and switch on electrical power. for easier setup. Refer to Section 8.1, Table 11...
  • Page 34 LAARS Heating Systems Page 34 Figure 25. Adjustment Screws and Settings for CO GAS TYPE HIGH FIRE, CO LOW FIRE, CO Natural Propane 10.0 10.0 Table 13. CO Range.

  • Page 35: Maintenance

    Remove the servicing. front door of the boiler to gain access to the ignitor Mascot II gas and electric controls are engineered assembly. Remove the two wires connected to the for long life and dependable operation, but the safety of assembly.

  • Page 36: Flame Sensor

    Soot buildup or other debris on the heat exchanger may 11.2.7 Gas Conversion restrict the flue passages. Mascot II units can be converted from natural to If black carbon soot buildup on the heat exchanger propane gas or from propane to natural gas easily in the is suspected, disconnect electrical supply to the unit, field.

  • Page 37: Sequence Of Operation

    12.1 Sequence of Operation Mascot II is a cold start appliance that should start AVERTISSEMENT only on a call for heat from a tank aquastat, room Ce conversion doit être installé par un organisme de thermostat, zone valve end switch or other space service conformément aux instructions du fabricant et...
  • Page 38 LAARS Heating Systems Page 38 CODE# PROBLEM PROBABLE CAUSE SOLUTION COMMON LOCKOUT CODES Internal error Flame rod to ground Check wiring / probe grounded, dirty probe Flame rod to ground leakage Faulty flame detector Clean or replace flame detector 24VAC voltage low/high Faulty transformer Check/correct supply line voltage;...
  • Page 39 Mascot II Boilers and Water Heaters Page 39 CODE# PROBLEM PROBABLE CAUSE SOLUTION ALERT CODES Maximum cycle count Control operates correctly, was reached however the cycle count will not increment any higher than 999,999 cycles Replace controller or adjust the count using blue display...

  • Page 40: General Information

    Use only genuine LAARS replacement parts. 13.1 General Information To order or purchase parts for the LAARS Mascot II, 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 41 Mascot II Boilers and Water Heaters Page 41 ITEM DESCRIPTION SIZE 125 ITEM DESCRIPTION SIZE 125 BURNER COMPONENTS - see Figure 33 PLUMBING COMPONENTS - see Figure 35 Burner, main R2069102 Tank, expansion, rect, 10 liter A2117400 Gasket, burner RS2108500...
  • Page 42 LAARS Heating Systems Page 42 Figure 28. Panel Assembly, Door Top.
  • Page 43 Mascot II Boilers and Water Heaters Page 43 Figure 29. Panel Assembly, Door Middle.
  • Page 44 LAARS Heating Systems Page 44 Figure 30. Panel Assembly, Door Bottom.
  • Page 45 Mascot II Boilers and Water Heaters Page 45 Figure 31. Base Jacket Assembly.
  • Page 46 LAARS Heating Systems Page 46 Figure 32. Heat Exchanger Cabinet, Fan.
  • Page 47 Mascot II Boilers and Water Heaters Page 47 Figure 33. Heat Exchanger Burner Components.
  • Page 48 LAARS Heating Systems Page 48 Figure 34. Pump Assembly Components.
  • Page 49 Mascot II Boilers and Water Heaters Page 49 Figure 35. Plumbing Components.
  • Page 50 LAARS Heating Systems Page 50...
  • Page 51 Mascot II Boilers and Water Heaters Page 51...
  • Page 52 (Customer Service, Service Advisors) 20 Industrial Way, Rochester, NH 03867 • 603.335.6300 • Fax 603.335.3355 (Applications Engineering) 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 1111 Document 1230A...

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LmcMascot ii lmcMascot ii lmh

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