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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
M
ASCOT
Wall-Mounted, Modulating
Boiler
Model MLXH
50, 75, 100, 125, 150, 175,
& 220 MBH
Combination Boiler
Model MLXC
125, 150 and 175 MBH
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 ou ni
d'autres vapeurs ou liquides inflammables dans
le à proximité de cet appareil ou de tout autre
appareil.
QUE FAIRE SI VOUS SENTEZ UNE ODEUR DE
• Ne pas tenter d'allumer d'appareils.
• Ne touchez à aucun interrupteur. Ne pas vous servir
des téléphones dans le bâtiment où vous vous
trovez.
• 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 1285A
LX
®
GAZ:
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Related Manuals for Laars MASCOT LX
Summary of Contents for Laars MASCOT LX
- Page 1 Installation and Operation Instructions Document 1285A Installation and Operation Instructions for ASCOT ® Wall-Mounted, Modulating Boiler Model MLXH 50, 75, 100, 125, 150, 175, & 220 MBH Combination Boiler Model MLXC 125, 150 and 175 MBH 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.
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Page 2: Table Of Contents
Model Nomenclature........... 1 Pump Capacity Mascot LX Overview ........... 2 Start Up / Shut Down Instruction (Decal) .... 3 5.1 Mascot LX Heating System Pump Capacity ..18 Dimensions for all Sizes ........4 Unpacking ............6 SECTION 6. Warranty ............. 6 Water Connections Central Heat System Piping...... - Page 3 Filling the Boiler System ........39 10.2 Starting the Burner after Set Up ....... 39 10.2.1 Burner Operation ..........39 10.2.2 Boiler Setup and Adjustment ......40 10.3 Shutting Down the Mascot LX ......40 10.4 To Restart the Mascot LX ......... 40...
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Page 4: General Information
This is true for all sizes. WARNING Mascot LX units must be installed in accordance with the procedures detailed in this manual, or the LAARS Heating Systems warranty will be voided. The installation must conform to the requirements of the local jurisdiction having authority, and, in the United States, to the latest edition of the National Fuel Gas Code, ANSI Z223.1/NFPA54. -
Page 5: Introduction
H = Modulating Boiler To remove these panels for further access into the C = Combination Boiler and Water Heater Mascot LX, there are two screws that hold each panel in Configuration place. Remove the 2 screws on the upper panel and slide W = Wall Hung the upper metal panel up and out. -
Page 6: Mascot Lx Overview
LAARS Heating Systems Page 2 1.5 Mascot LX, Overview GAS SUPPLY CENTRAL HEAT OUT CONNECTION (SUPPLY WATER) CENTRAL HEAT IN CONNECTION (RETURN WATER) BOTTOM VIEW 2 SCREWS USER INTERFACE ON / OFF SWITCH HOT OUT COLD IN TEMPERATURE / DHW FLAT PLATE... -
Page 7: Start Up / Shut Down Instruction (Decal)
Mascot LX Boilers and Water Heaters Page 3 1.6 Start Up / Shut Down Instructions (Decal) The Start Up / Shut Down Instruction (Decal) can be found on the metal panel behind the Top Panel. See Figure This Decal is also referred to as the Operating Instructions Label and/or Warning Label. -
Page 8: Dimensions For All Sizes
LAARS Heating Systems Page 4 17" 1.7 Dimensions, Mascot LX " HYDRONIC OUTLET " ELIMINATION VENT " INLET HYDRONIC EXHAUST INLET VENT " FRONT SIDE CONDENSATE TRAP HYDRONIC INLET OUTLET HYDRONIC OUTLET INLET BOTTOM Figure 5. Dimensional Drawing, All Sizes... - Page 9 Mascot LX Boilers and Water Heaters Page 5 Dimension Model 50, 75 MBH 1" (3) 15-3/4" (40) 3-3/4" (9) 9-1/4" (24) 8" (20) 1-1/2" (4) 5-3/4" (14) 15-1/2" (39) 100 MBH 1" (3) 15-1/2" (39) 1-1/4" (3) 12-3/4" (33) 11" (28) 1-1/4"...
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Page 10: Unpacking
LAARS Heating Systems Page 6 1.8 Unpacking The Mascot LX is shipped in a single crate with the standard components packed with the appliance Figure 1. Remove all packing and tie-down materials. 2. Check contents of the carton against items shown. -
Page 11: Locating The Appliance
50,000 47,500 95% 1/2” NPT 3/4” 14.6 13.2 The Mascot LX must be mounted to a suitable wall by 75,000 71,250 21.9 20.8 95% 1/2” NPT 3/4” a qualified heating contractor under the guidelines of a 100 100,000 29.3 95,000 27.8... -
Page 12: Wall Mount Hole Locations
Bolts/Anchors (4) 8.1 cm Centered provided by installer, Dimensions shown in Inches and centimeters Wall Bracket each is to be suitable for Desired top of Mascot LX (supplied) 160 lbs [73kg] 12P3013 Bracket factory- minimum. mounted on back of Mascot 16”... -
Page 13: Venting And Combustion Air
INTAKE / EXHAUST horizontal ducts, each opening shall have a minimum A Mascot LX unit can take combustion air from the Max Equivalent Vent and Air Pipe Length (each) free area of not less than 1 square inch per 2000 Btu/... -
Page 14: Ducted Combustion Air
Other methods of introducing combustion and certified vent class. If the Mascot LX is installed in ventilation air are acceptable, providing they conform to an application where the ambient temperature is the requirements in the applicable codes listed above. - Page 15 1/4" per foot, so that condensate AVIS will run back to the Mascot LX to drain. Route vent les chaudières de catégories II et IV doivent être pipe to the heater as directly as possible. Seal all installées de façon à...
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Page 16: About Common Venting
Notes: DO NOT COMMON VENT MASCOT LX UNITS. "x", "xx" and "xxxx" refer to variations in nominal size. See manufacturer's Mascot LX units are never permitted to share a catalog for a particular application. vent with Category I appliances. These manufacturers samples have been tested and authorized to safely operate with Laars equpment. -
Page 17: Locating Vent & Combustion Vent Terminals
3.3 Locating Vent & Combustion Air Terminals 3.3.1 Side Wall Vent Terminal The appropriate Laars side wall vent terminal must be used. The terminal must be located in accordance with ANSI Z223.1/NFPA 54 and applicable local codes. In Canada, the installation must be in accordance with CSA B149.1 or .2 and local applicable codes. - Page 18 LAARS Heating Systems Page 14 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);...
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Page 19: Vertical Vent Terminal
Mascot LX Boilers and Water Heaters Page 15 3.3.3 Vertical Vent Terminal b. In the event that the requirements of the subdivision cannot be met at the time of completion of When the unit is vented through the roof, the vent must installation, the owner shall have a period of thirty (30) extend at least 3 feet (0.9m) above the point at which it... -
Page 20: Common Vent Test
AVIS Mascot LX units require special vent systems and fans for common vent. See Section 3.2.1 or contact the Au moment du retrait d'une chaudière existante, les factory if you have questions about common venting mesures suivantes doivent être prises pour chaque... -
Page 21: Gas Supply And Piping
Verify that the appliance is fitted for the proper type be an indication of an undersized gas meter, undersized of gas by checking the rating plate. Mascot LX will gas supply lines and/or an obstructed gas supply line. function properly without the use of high altitude... -
Page 22: Pump Capacity
Pump Capacity 5.1 Mascot LX Heating System Pump Capacity Mascot LX's internal pump is sized for a maximum of 30 ft total equivalent pipe. Laars strongly recommends the unit to be piped in primary/secondary fashion, or use a TO SIZE PIPING: Measure linear distance from meter outlet to last boiler. -
Page 23: Central Heat System Piping
Contact Laars for alternate configurations. 6.3 Freeze Protection Mascot LX units are certified for indoor use only, and are not design-certified for placement outdoors. 6.6 Indirect Water Heater Piping The MLXH model can control an indirect water heater Proper precautions for freeze protection are zone. -
Page 24: Condensate Drain
LAARS Heating Systems Page 20 6.7 Condensate Drain A condensate drain trap is built into the Mascot LX. Connect a 3/4” PVC pipe between the drain connection and a condensate neutralizer before entering drainage system. The condensate drain and included trap must be installed. -
Page 25: Piping Schematics
6.8 Piping Schematics outlet (boiler location) to Figure 14 through Figure 19 illustrate typical piping reduce potential for scalding. configurations for Mascot LX boilers. These diagrams Contact Laars for are only meant as a guide. All components or piping recommended models. - Page 26 LAARS Heating Systems Page 22 Figure 15. Hydronic Piping (only) — with an indirect tank as a zone.
- Page 27 Mascot LX Boilers and Water Heaters Page 23 Figure 16. Hydronic Piping — MLXC Multi boilers for large homes with long / multiple baseboard zones.
- Page 28 LAARS Heating Systems Page 24 Figure 17. Hydronic Piping — MLXC Multi boilers for large homes with long / multiple radiant zones.
- Page 29 Mascot LX Boilers and Water Heaters Page 25 Figure 18. Hydronic Piping — MLXC Heating zones piped with zone pumps.
- Page 30 LAARS Heating Systems Page 26 Figure 19. Hydronic Piping — Heating zones piped with zone valves.
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Page 31: Electrical Connections
Figure 21). Domestic Hot Water Sensor PN is E2337501 CAUTION Mascot LX supply voltage must not be disengaged, 7.7 System Sensor except for service or isolation, or unless otherwise instructed by procedures outlined in this manual. To Connect the system sensor to connections labeled signal a call for heat, use the 24V DC field-interlock, "system sensor"... -
Page 32: Ladder Diagram, Connections, And Wiring Diagrams
LAARS Heating Systems Page 28 REVISIONS REV. DRAFT CHECK JM 5-22-14 CD 5 14-016N-08 Ladder Diagram, Connections, and Wiring Diagrams GRAPHIC CORRECTION CHANGE: (see Figure 20 thru Figure 22) 120VAC NEUTRAL PWB-3 PWB-2 PWB-1 ON/0FF SWITCH CIRCUIT BREAKER BLOWER MAIN CONTROL... - Page 33 3.00 Mascot LX Boilers and Water Heaters Page 29 OUTDOOR SENSOR SYSTEM SENSOR 1- GROUND 2- NEUTRAL TANK AQUASTAT 3- LINE 4- SYS PMP SENSOR 11 + 5- NEUTRAL DC IN 12 - 13 + DC OUT 7- NEUTRAL 14 -...
- Page 34 LAARS Heating Systems Page 30 Figure 22. Wiring Diagram.
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Page 35: Control Setup And Operation
Pressure Gauges Figure 23. The User Interface The User Interface is located on the one panel of the Mascot LX that is not removable. It contains all the buttons and gauges that are necessary to contol and monitor the unit. See Figure 23 8.1 Digital Display... -
Page 36: Controller Modes
USER Mode is for a homeowner or service technician to adjust the most common operating parameters SERVICE mode is used only by trained Mascot LX (See Table 14). technicians. -
Page 37: User Mode
Mascot LX Boilers and Water Heaters Page 33 8.3 USER Mode The USER Mode is for a homeowner or service technician to adjust the most common operating parameters (See Table 14). In the USER Mode, when the boiler is ON and operating normally, the USER can scroll Up and Down using the Arrow Keys. -
Page 38: Installer Mode
Laars SIT Parameters LAARS Heating Systems Page 34 USER MODE 8.4 INSTALLER Mode PARAMETER Description DEFAULT Param INSTALLER Mode is an extensive set of parameters again. The INSTALLER Mode Parameters will then that can be changed to suit the individual installation and be accessible by pressing the Up or Down arrows. -
Page 39: Service Mode
The control uses a PID algorithm to adjust the firing 8.5 SERVICE Mode rate of the boiler as the control point is approached. The Mascot LX Series of appliances has been Page 2 The goal of the control is to operate at a minimum designed with a SERVICE Mode of operation firing rate to match the load on the appliance. -
Page 40: High Limit
The control will automatically reduce the firing of the 9.1 Hydronic Heating Demand Mascot LX to prevent the high limit from tripping. The high limit setpoint is not adjustable. When using the Mascot LX for hydronic heating a call for heat must be supplied to the "T-T or Interlock"... -
Page 41: Warm Weather Shutdown
9.5.c Boiler only DHW sensor demand the external signal directly corresponds to fan speed An optional DHW sensor (Laars PN E2337501) can or ‘boiler power’ In this mode, the call is initiated by also be installed in an indirect water heater connected to the 0-10v input based on Installer Parameters P33 “On... -
Page 42: Cascade Auto Configuration
LAARS Heating Systems Page 38 9.7 Cascade Auto Configuration 9.7.1 Cascade Manual Configuration To operate up to 8 boilers in cascade, the boilers In some applications it may be necessary to configure the must be “daisy chained” together using Modbus cascade system manually. -
Page 43: Set Up Instructions
Note that there is an air bleed located on the emergency shutoff devices. left side of Mascot LX, on top of the jacket. WARNING Cycle the boiler pump on and off 10 times, 10... -
Page 44: Boiler Setup And Adjustment
Close all manual gas valves. Measure the CO in the flue products at high fire. WAIT FIVE (5) MINUTES. The Mascot LX can be forced to high fire to allow for easier setup. Refer to Section 8 for instructions Set the aquastat or thermostat to its lowest setting. - Page 45 Mascot LX Boilers and Water Heaters Page 41 Note: High and Low Fire CO 2 settings should be approximately equal. Adjustment Screws on Gas Valve Close door first, before measuring CO 2 Range High-fire setting Manifold Pressure Low-fire Screw setting (under cap) Figure 26.
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Page 46: Maintenance
LAARS Heating Systems Page 42 SECTION 11. Maintenance Mascot LX gas and electric controls are engineered for long life and dependable operation, but the safety of WARNING equipment depends on their proper functioning. Only Disconnect all power to the appliance before a qualified service technician should inspect the basic attempting any service to the appliance. -
Page 47: Ignitor Assembly
Mascot LX Boilers and Water Heaters Page 43 the fastening points on the right side of the control to 11.2.6 Heat Exchanger Coils remove the hooks from the control panel. To replace Black carbon soot buildup on the internal surfaces of... -
Page 48: Gas Conversion
There are no parts or orifices required for the gas compétente. Si les informations contenues dans ces conversion of the Mascot LX. But if a gas conversion instructions n'est pas suivi à la lettre, un incendie, is performed, the unit must be identified with the... -
Page 49: Troubleshooting
SECTION 12. Troubleshooting 12.1 Sequence of Operation Mascot LX is a cold start appliance that should start only on a call for heat from a tank aquastat, room thermostat, zone valve end switch or other space temperature control device (flow switch for DHW). -
Page 50: Error Codes
LOCKOUT CODES CODE DESCRIPTION LAARS Heating Systems Page 46 E001 Memory error lockout E002 Fan speed error E003 Flame present when not in run 12.3 Error Codes - Table E004 Outlet auto-reset hi limit E005 Water pressure switch error LOCKOUT CODES... - Page 51 Mascot LX Boilers and Water Heaters Page 47...
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Page 52: Replacement Parts
LAARS Heating Systems Page 48 SECTION 13. Replacement Parts 13.1 Exploded Parts Views, and their Laars Part Numbers See Figure 31, For blower and combustion parts Figure 30. Parts... - Page 53 P2074600 SWITCH, LOW PRESSURE P2074500 VENT, AIR, AUTO E2357300 GROMMET, SENSOR, FLUE Mascot LX Boilers and Water Heaters Page 49 E2357500 SENSOR, OUTLET S2105400 2P2003 GASKET, BLOWER/ FAN OUTLET 2-Jun-14 2-Jun-14 12P2065 ADAPTER PLATE Laars PN Description Laars PN Description...
- Page 54 LAARS Heating Systems Page 50 Figure 31. Parts, Blowers and Combustion...
- Page 55 P7050 Call Factory CONTROL BOARD - w/Firmware Call Factory E2356800 DISPLAY UNIT Mascot LX Boilers and Water Heaters Page 51 E2335100 2P7008 CIRCUIT BREAKER, 2A E2318900 CIRCUIT BREAKER, 10 AMP E2357200 2P3002 SENSOR, DUPLEX, FLUE P2074600 SWITCH, LOW PRESSURE P2074500...
- Page 56 Customer Service and Product Support: Industrial Way, Rochester, NH 03867 • 603.335.6300 • Fax 603.335.3355 Headquarters: 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 1409 Document 1285A...