Laars MASCOT LX - User Manual

Installation and Operation Instructions Document 1285A
H2364000A
WARNING
If the information in this manual is not
followed exactly, a re or explosion may
result causing property damage, personal
injury or loss of life.
Do not store or use gasoline or other
ammable 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 re department.
Installation and service must be performed
by a qualied installer, service agency, or gas
supplier.
FOR YOUR SAFETY: This product must be installed and serviced by a professional service technician,
qualied in hot water boiler and heater installation and maintenance. Improper installation and/or operation
could create carbon monoxide gas in ue gases which could cause serious injury, property damage, or
death. Improper installation and/or operation will void the warranty.
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 inammables dans
le à proximité 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 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 qualié
ou par le fournisseur de gaz.
Installation and Operation
Instructions for
MASCOT
®
LX
Wall-Mounted, Modulating
Boiler
Model MLXH
50, 75, 100, 125, 150, 175,
& 220 MBH
Combination Boiler
Model MLXC
125, 150 and 175 MBH

Summary

General Information

Introduction

Provides an overview of the manual's purpose and scope.

Opening the Mascot LX

Details how to access internal components by removing panels.

Rating Plate Information

Describes the location and content of the appliance's rating plate.

Model Nomenclature

Explains the system of letters and numbers identifying the appliance's characteristics.

Locating the Appliance

Appliance Placement

Guidelines for selecting a suitable location for installation.

Vent Terminal Clearances

Specifies required clearances for vent terminals to ensure safe operation.

Venting and Combustion Air

Combustion Air Requirements

Explains how the unit obtains combustion air, either from the space or via ducting.

Combustion Air from Room

Details requirements for spaces communicating with the outdoors for combustion air.

Venting System

Covers requirements and considerations for the exhaust venting system.

Mascot LX Overview and Safety

Opening the Mascot LX Diagram

Diagram showing how to open the Mascot LX panels for access.

Mascot LX Component Overview

Start Up;Shut Down Instructions

Appliance Dimensions

Unpacking the Appliance

Warranty Information

Appliance Installation Location

Installation Location Guidelines

Specifies requirements for choosing a suitable wall and clearance for the appliance.

Vent and Air Terminal Clearances

Details clearances for vent and combustion air terminals.

Wall Mounting Hole Locations

Combustion Air Requirements

Combustion Air Supply

Explains requirements for combustion and ventilation air.

Combustion Air from Room

Details methods for providing combustion air from the installation space.

Exhaust Venting

Covers requirements and considerations for the exhaust venting system.

Ducted Combustion Air

Exhaust Venting Material Requirements

Vent and Combustion Air Terminal Location

Side Wall Vent Terminal Location

Guidelines for locating the side wall vent terminal.

Common Venting Restrictions

Side Wall Combustion Air Terminal

Vertical Vent Terminal Requirements

Vertical Combustion Air Terminal

Massachusetts Installation Requirements

Common Vent Testing Procedures

Gas Supply and Piping

Gas Supply Piping Guidelines

Details requirements for gas piping installation, sizing, and safety.

Pump Capacity

Mascot LX Pump Capacity

Information on the pump's capacity and recommended piping configurations.

Water Connections

Central Heat System Piping

Guidelines for piping the central heating system.

Cold Water Make-Up Connection

Freeze Protection

Recognized Chemicals

DHW Piping (MLXC)

Indirect Water Heater Piping

Condensate Drain

Piping Schematics

Electrical Connections

Main Power Connection

Details how to connect the main power supply to the unit.

Pump Connections

Information on connecting the boiler and system pumps.

24 Vac Transformer and Circuit Breaker

Explains the 24Vac transformer and its circuit breaker.

Central Heat Call for Heat

How to connect the call for heat signal.

Outdoor Air Temperature Sensor

Connecting the outdoor sensor for weather-dependent control.

Domestic Hot Water Connection

Connecting controls for indirect water heaters or DHW sensors.

System Sensor Connection

Connecting the system sensor for boiler operation.

External Control Connections

Connecting external 0-10VDC signals for modulation or setpoint.

Wiring Diagrams and Connections

Control Setup and Operation

Digital Display Overview

Describes the digital display as the main interface for monitoring and adjusting parameters.

Controller Modes

User Mode Operation

Installer Mode Configuration

Service Mode Procedures

Modulation Control

Pump Control Logic

High Limit Function

Stack Temperature Monitoring

Domestic Hot Water Temperature Control

Operation Modes

Hydronic Heating Demand

Initiating a call for heat and the ignition sequence.

Hydronic Heating with Outdoor Reset

How outdoor temperature influences heating setpoints.

External Modulation Control (BMS)

Integrating with building management systems via 0-10VDC input.

External Control of Modulation

External Control of Setpoint

External Signal for Heat Demand

Warm Weather Shutdown

Domestic Hot Water Demand

Combi Boiler DHW Demand

DHW demand triggered by a flow sensor in Combi models.

Boiler Only DHW Aquastat Demand

DHW demand initiated by an aquastat in an indirect water heater.

Boiler Only DHW Sensor Demand

DHW demand initiated by an optional DHW sensor.

Domestic Hot Water Priority

Cascade Auto Configuration

Cascade Manual Configuration

Procedures for manually configuring boilers in a cascade system.

Set Up Instructions

Filling the Boiler System

Step-by-step guide for filling and purging the boiler and system with water.

Starting the Burner Post Setup

Procedures for checking installation and starting the burner.

Burner Operation Check

Essential checks before operating the burner.

Boiler Setup and Adjustment

Shutting Down the Mascot LX

Restarting the Mascot LX

Troubleshooting

Sequence of Operation

Describes the step-by-step process of the unit's operation.

Short Cycling Issues

Discusses causes and symptoms of short cycling.

Error Codes

Replacement Parts

Exploded Parts Views and Part Numbers

Provides diagrams and part numbers for replacement components.

Laars MASCOT LX Specifications

General

Category	Boiler
Brand	Laars
Model	MASCOT LX
Fuel Type	Natural Gas or Propane
Boiler Type	Condensing
Efficiency	Up to 95%
Vent Type	Direct Vent
Water Connections	1" NPT
Heat Exchanger Material	Stainless Steel
Vent Diameter	2" or 3"
Weight	150 lbs