Installation and Operation Instructions Document 1285A 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 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.
LAARS Heating Systems TABLE OF CONTENTS SECTION 1. General Information SECTION 4. Gas Supply and Piping 1.1 Introduction ......................................................... 1 4.1 Gas Supply and Piping........................................... 17 1.2 To Open the Mascot LX....................................... 1 1.3 Rating Plate......................................................... 1 1.4 Model Nomenclature........................................... 1 1.5 Mascot LX Overview.............
Mascot LX Boilers and Water Heaters SECTION 8. CONTROL Setup and Operation SECTION 11. Maintenance 8.1 Digital Display.................................................... 31 11.1 System Maintenance ........................................ 42 8.2 CONTROLLER Modes...................................... 32 11.2 8.3 User Mode......................................................... 33 Appliance Maintenance and Component Description......................................................... 42 8.
LAARS Heating Systems MASCOT LX SECTION 1. General Information START-UP INSTRUCTIONS WIRING DIAGRAM RATING PLATE Figure 1. Opening the Mascot LX. The top and bottom panels come off when pulled forward. 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.
Page 1 Mascot LX Boilers and Water Heaters 1.1 Introduction This manual provides information necessary for the installation, operation, and maintenance of LAARS Heating Systems Mascot LX appliances. Read it carefully before installation. All application and installation procedures should be reviewed completely before proceeding with the installation. Consult the LAARS Heating Systems factory, or local factory representative, with any problems or questions regarding this equipment.
LAARS Heating Systems Page 2 1.
Mascot LX Boilers and Water Heaters 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 1. This Decal is also referred to as the Operating Instructions Label and/or Warning Label. FOR YOUR SAFETY READ BEFORE OPERATING "WARNING: If you do not follow these instuctions exectly, a fire or explosion may result causing property damage, personal injury or loss of life. A. This appliance does not have a pilot.
LAARS Heating Systems Page 4 HYDRONIC OUTLET 17" 43 73 " 4 20 AIR ELIMINATION VENT AIR INLET EXHAUST VENT 1.7 Dimensions, Mascot LX 31 " 4 8 31 " 4 8 GAS N HYDRONIC INLET TOP 23 " 4 7 M O FRONT CONDENSATE TRAP HYDRONIC INLET F C DHW OUTLET SIDE GAS HYDRONIC OUTLET E J D G A L BOTTOM K B H DHW INLET Figure 5.
Page 5 Mascot LX Boilers and Water Heaters Model Dimension A B C D E F G H J* 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" (3) 9-1/2" (24) 14-3/4" (37) -- 125 MBH 1" (3) 15-1/2" (39) 1-1/4" (3) 12-3/4" (33) 11" (28) 1-1/4" (3) 9-1/2" (24) 14-3/4" (37) 2-3/4" 150, 175 MBH 1-1/2" (4) 15-1/4" (39) 1-3/4" (4) 13" (33) 11-1/4" (28) 2-3/4" (7)
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 See Figure 6: 1. Remove all packing and tie-down materials. 2. Check contents of the carton against items shown. 7 4 2 5 8 1 Bird Screen 3 6 1) PRV 2) PRV Pipe w/ washer 3) Wall attach bracket 9 4) Outdoor sensor 5) Exhaust terminal assy 6) Air intake terminal assy 7) Gas Supply Shut Off Valve 8) Washer 9) Flow restrictor Figure 6.
Page 7 Mascot LX Boilers and Water Heaters SECTION 2. Locating the Appliance 2.1 Locating the Appliance 12 30 Sizing Data The Mascot LX is designed for indoor wall-mounted installations only. Input Model MLX 50 Output BTU/h kW BTU/h kW 50,000 14.6 47,500 13.2 DHW AFUE Gas Wa Output @ Conn. Size Conn 75°F Rise inches inch - 95% 1/2” NPT 3/4” The Mascot LX must be mounted to a suitable wall by MLX 75 75,000 21.9 71,250 20.
Overall Width 17 " Page 8 43.2 cm Bolts/Anchors (4) provided by installer, each is to be Heating suitable for LAARS 160 lbs [73kg] minimum. Centered Wall Bracket (supplied) 12P3013 Systems 2" Air Inlet C 2.2 Wall Mount Hole Locations. 7 3 " 4 19.6 cm 32" Overall Width 17 " 43.2 cm A B 2 Exhaust and Concentric 3 1 " 4 8.1 cm 2" Air Inlet16” 40.6 cm 7 43 " 2" Exhaust and 19.6 cm Concentric 3 1 " 4 Bolts/Anchors 8.
m m Page 9 Mascot LX Boilers and Water Heaters SECTION 3. Size and Combustion Air Venting Boiler Volts Phase Laars Mascot CPVC vent/ MLX 50LX includes a standard 120 Single combustion air adapter. If field connections require use of MLX 75 120 Single PVC/CPVC vent materials, the installer must use proper MLX 100 120 Single adhesive join CPVC and/or120 PVC pipe and fittings. MLX to125 Single MLX 150 120 Single MLX 175 120 Single 3.
LAARS Heating Systems Page 10 INSTALLATION STANDARDS MATERIAL ABS PVC, sch 40 CPVC, sch 40 Polypropylene Single wall galv. steel Table 6. UNITED STATES ANSI/ASTM D1527 ANSI/ASTM D1785 or D2665 ANSI/ASTM F441 UL1738, ULC S636. 26 gauge Air pipe material must be chosen CPVC, sch 40, ANSI/ASTM, Polypropylene based upon the intended application of the boiler. Required Combustion Air Pipe Material.
Page 11 Mascot LX Boilers and Water Heaters WARNING All venting must be installed according to this manual and any other applicable local codes, including but not limited to, ANSI Z223.1/NFPA 54, CSA B149.1, CSAB149.2 and ULC-S636. Failure to follow this manual and applicable codes may lead to property damage, severe injury, or death.
LAARS Heating Systems Page 12 INSTALLATION STANDARDS MATERIAL Stainless Steel PVC, sch 40 CPVC, sch 40 Polypropylene Table 8. UNITED STATES UL 1738 ANSI/ASTM D178 ANSI/ASTM F441 UL1738 or ULC-S636 CANADA Venting must be ULC-S636 certified for use as venting material. The venting material must be chosen based upon the intended application of the boiler. Required Exhaust Vent Material. Allowable Polypropylene Vent Manufacturers / Trade Names 3.2.
Mascot LX Boilers and Water Heaters Page 13 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. Consider the following when installing the terminal: 1.
LAARS Heating Systems Page 14 U.S. Installations (see note 1) Canadian Installations (see note 2) A= Clearance above grade, veranda, porch, deck, or balcony 12 inches (30 cm) See note 6 12 inches (30 cm) See note 6 B= Clearance to window or door that may be opened Direct vent only: 12 inches (30cm); Other than Direct vent: 4 ft (1.
Mascot LX Boilers and Water Heaters 3.3.3 Vertical Vent Terminal When the unit is vented through the roof, the vent must extend at least 3 feet (0.9m) above the point at which it penetrates the roof. It must extend at least 2 feet (0.6m) higher than any portion of a building within a horizontal distance of 10 feet (3.0m), and high enough above the roof line to prevent blockage from snow.
LAARS Heating Systems Page 16 3.4 Common Vent Test NOTE: This section does not describe a method for common venting Mascot LX units. It describes what must be done when an existing unit is removed from a common vent system. Mascot LX units require special vent systems and fans for common vent. See Section 3.2.1 or contact the factory if you have questions about common venting Mascot LX units.
Page 17 Mascot LX Boilers and Water Heaters SECTION 4. Gas Supply and Piping WARNING: Open flame can cause gas to ignite and result in property damage, severe injury, or loss of life. 4.1 Gas Supply and Piping Gas piping should be supported by suitable hangers or floor stands, not the appliance. Review the following instructions before proceeding with the installation. 1. Verify that the appliance is fitted for the proper type of gas by checking the rating plate.
LAARS Heating Systems Page 18 SECTION 5. Pump Capacity Mascot LX NATURAL GAS REQUIRED SIZE CU FT / HR INPUT RATE. 50 75 100 125 150 175 220 50 75 100 125 150 175 220 5.1 Mascot LX Heating System Pump Capacity TO SIZE PIPING: Measure linear distance from meter outlet to last boiler. Add total input of all boilers and divide by 1000 to obtain cu ft / hr required. Add total equivalent length of fittings used according to Table 6B.
Page 19 Mascot LX Boilers and Water Heaters Mascot LX's efficiency is higher with lower return water temperatures. Laars strongly recommends that Mascot LX be piped in a primary-secondary fashion (using either piping or a hydraulic separator) such that the pump that is mounted on the boiler ONLY serves the boiler. Mascot LX 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.
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. When a condensate pump is not used, the tubing must continuously slope downward toward the drain with no spiraling. Consult local codes for the disposal method. Figure 13. DHW Connections with Anti-Scald Valve and Flow Restrictor.
Page 21 Mascot LX Boilers and Water Heaters CAUTION Scalding Risk: Laars recommends the use of a thermostatic mixing valve at domestic hot water outlet (boiler location) to reduce potential for scalding. Contact Laars for recommended models. 6.8 Piping Schematics Expansion tank and auto feed Air Eliminator Heating Supply * * * * * Figure 14. Hydronic Piping — High and low temp zones.
Expansion tank and auto feed Heating Supply 1" piping to DHW Sediment trap Heating Return * Closely spaced tee's - 4 pipe diameters apart * * Air Eliminator * * * * * * * * * Figure 15. Hydronic Piping (only) — with an indirect tank as a zone.
* Zones with: -zone valves 24V -balancing valves DHW Sediment trap check valve * Closely spaced tee's - 4 pipe diameters apart * Purge/drain valves 1-41" Primary loop Expansion tank and auto feed Air seperator Multi Mascot LXs for Large house residential with long / muliple baseboard zones check valve DHW Mascot LX Boilers and Water Heaters Page 23 Figure 16. Hydronic Piping — MLXC Multi boilers for large homes with long / multiple baseboard zones.
* Zones with: -zone valves 24V -balancing valves Note: Expansion tank may be required if system volume is over 50 gallons Sediment trap * * Closely spaced tee's - 4 pipe diameters apart Purge/drain valves 1-41" Primary loop Expansion tank and auto feed Page 24 LAARS Heating Systems Figure 17. Hydronic Piping — MLXC Multi boilers for large homes with long / multiple radiant zones.
Figure 18. Hydronic Piping — MLXC Heating zones piped with zone pumps.
Figure 19. Hydronic Piping — Heating zones piped with zone valves.
Page 27 Mascot LX Boilers and Water Heaters SECTION 7. Electrical Connections WARNING The appliance must be electrically grounded in accordance with the requirements of the authority having jurisdiction or, in the absence of such requirements, with the latest edition of the National Electrical Code, ANSI/ NFPA 70, in the U.S. and with latest edition of CSA C22.1 Canadian Electrical Code, Part 1, in Canada. Do not rely on the gas or water piping to ground the metal parts of the boiler.
2 Page 28 LAARS Heating Systems REVISIONS ECN REV. 7.
Mascot LX Boilers and Water Heaters 3.
B A 40 O O O V G G BK R BL BR GY BL O V R BK Y GY BL 21 W Y G FWB FACE DOW N 20 1 SAFETY O INTERLOCK MODBUS GND GROUND DC OUT DC IN + + - DHW SENSOR TANK AQUASTAT FIELD T INTERLK T SYSTEM SENSOR OUTDOOR SENSOR BK GY R FROM X8 LINE 12 DHW PUMP RELAY SYSTEM PUMP RELAY PUMPS BY OTHERS WHEN REQ'D R R BOILER PUMP BR FROM PWB PWB FACE UP SPARE ALARM CONTACTS W/GY NEUT W Y GY COMBI UNITS ONLY 3 WAY VALVE G G R BK BL BR W/V W GY Y W BL V O FROM FWB
Page 31 Mascot LX Boilers and Water Heaters SECTION 8. Control Setup and Operation The Mascot LX control is an integrated electronic control that includes flame control, safety device monitoring and pump regulating functions. The control regulates the heat input by controlling the blower speed and activating the gas valve. The board controls the ignition sequencing and monitors signals received by all boiler sensors. The control regulates the boiler set temperatures and operating modes.
LAARS Heating Systems Page 32 3 4 5 8 7 1 6 2 Up (next) Looping Scroll Down (next) 10 9 Reset 11 12 13 Cancel 14 15 SELECT / OK Figure 24. Display Icons These icons and numbers are always displayed (either outlined or 'Darkened') 1- Current or set temperature, parameter number, modulation percentage. 2- Set temperature, parameter value, error code, announcement code. 3- Temperature unit (will show either Fahrenheit or Celsius). 4- Percentage or temperature set point.
Page 33 Mascot LX Boilers and Water Heaters 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. Of the 7 viewable parameters, 4 can be adjusted (depending on if they are installed). The USER adjustable parameters are the Outlet Temp, DHW Setpoint, and Outdoor Air Temp.
Laars SIT Parameters Page 34 LAARS Heating Systems USER MODE 8.4 INSTALLER Mode CIRCULATION PUMPS BMS ANTICYCLING & FLAGS Control Service User settings Description DEFAULT PARAMETER 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 U000 DHW set point 120 °Fthe Up or Down arrows.
Page 35 Table 16.
Page 36 8.8 High Limit The control uses a dual thermistor sensor to monitor the Mascot LX's maximum temperature. The high limit sensor is installed in the outlet water. A dual thermistor sensor is used, so that the two temperatures can be monitored and compared to confirm accuracy. The control will automatically reduce the firing of the Mascot LX to prevent the high limit from tripping. The high limit setpoint is not adjustable. 8.
Page 37 Mascot LX Boilers and Water Heaters outlet setpoint. The 0-10V signal may also be used to create a heat demand eliminating the need to supply a separate “TT call”. 9.3.a External Signal to Control Modulation.
Page 38 9.7 Cascade Auto Configuration To operate up to 8 boilers in cascade, the boilers must be “daisy chained” together using Modbus terminals A, B and GND, located on the boilers terminal block. The wiring should be completed with at least three wire shielded cable with ground. The ground wire should be connected to a suitable chassis ground on one end of the daisy chain only. Wire each boilers terminal A in series with the next boilers terminal A until all are connected.
Page 39 Mascot LX Boilers and Water Heaters SECTION 10. Set Up Instructions 10.1 Filling the Boiler System 1. Ensure the system is fully connected. Close all bleeding devices and open make-up water valve. Allow system to fill slowly. 2. Move manual lever on 3-way valve actuator to "open" position, allowing air to purge from boiler loop. Valve is normally in DHW position until there is a call for Central Heat via "T-T" contacts.
LAARS Heating Systems Page 40 4. Mascot LX will enter the start sequence. Blower and pump will energize for pre-purge, then the ignition sequence starts. After all safety devices are verified, the gas valve opens. If ignition doesn’t occur, turn off the Mascot LX, check that there is proper gas supply. Wait 5 minutes and start the unit again. 5. Turn Mascot LX on. 6.
Page 41 Mascot LX Boilers and Water Heaters Note: H igh and Low Fire CO2 settings should be approximately equal. Adjustment Screws on Gas Valve Close door first, before measuring CO2 Range High-fire setting Manifold Pressure Screw (under cap) Figure 26. Adjustment Screws and Settings for CO2 GAS TYPE Natural Propane CO2 (%) RANGE ) 8.9 __ 9.9 9.9 __ 10.9 Table 17. CO2 Range and Pressure Settings.
LAARS Heating Systems Page 42 SECTION 11. Maintenance WARNING Disconnect all power to the appliance before attempting any service to the appliance. Contact with electricity can result in severe injury or death. 11.1 System Maintenance (yearly, unless otherwise noted) 1. If a strainer is employed in a pressure reducing valve or the piping, clean it every six months. 2. Inspect the venting system for obstruction or leakage at least once a year.
Page 43 Mascot LX Boilers and Water Heaters the fastening points on the right side of the control to remove the hooks from the control panel. To replace the control repeat the steps above in the reverse order making sure to connect all wires in the proper location. Place the appliance in operation following the steps outlined in Section 10. 11.2.3 Ignitor Assembly The ignitor assembly is a two rod system that consists of a ground rod and a sense rod.
LAARS Heating Systems Page 44 WARNING Failure to rinse the debris from the heat exchanger and temporary drain line may lead to clogged condensate lines, traps and neutralizers. Condensate pumps (if used) may also be damaged from the debris left behind, possibly causing property damage. 10. Install all components removed in the reverse order to place the appliance back in operation. Make sure all gaskets are in place as components are installed. Replace any damaged gaskets. Do NOT reuse damaged gaskets.
Mascot LX Boilers and Water Heaters 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). 1. Upon a call for heat: (a) the internal pump and system pump will start; (b) the blower will begin a short pre-purge. 2.
LOCKOUT CODES CODE DESCRIPTION Page E001 46 Memory error lockout E002 Fan speed error E003 Flame present when not in run 12.3 Codes - See E004 Error Outlet auto-reset hi Table limit 18.
Mascot LX Boilers and Water Heaters Page 47
LAARS Heating Systems Page 48 12 SECTION 13. Replacement Parts 11 42 13.1 Exploded Parts Views, and their Laars Part Numbers See Figure 31, For blower and combustion parts 43 44 14 47 46 4 45 26 40 13 34 10 28 7 37 38 35 32 31 39 29 33 4 41 5 6 30 3 Figure 30.
2P2003 ef 2P9102 2P9103 2p2000 P7050 2P7008 2P3002 2P2003 2P4000 2p2000 2P3003 2P4000 2P3001 2P3003 11 P2074600 SWITCH, LOW PRESSURE 12 P2074500 VENT, AIR, AUTO 13 E2357300 GROMMET, SENSOR, FLUE Mascot LX Boilers and Water Heaters 14 E2357500 SENSOR, OUTLET 15 S2105400 GASKET, BLOWER/ FAN OUTLET 2-Jun-14 16 12P2065 ADAPTER PLATE Description Laars PN 17 S2124500 ORING, BLOWER INLET 1 P2067603 PIPE, PVC,VENTURI 3/4" SCHTO 40BLOWER X 6" LONG 18 S2127600 GASKET, 2 S2116300 O-RING, 1" ID X 1-3/16" 19
LAARS Heating Systems Page 50 20 18 4 19 15 16 25 24 23 21 22 27 26 Figure 31.
P7050 2P7008 2P3002 Ref 2P9102 2P2003 2P9103 P7050 2P7008 2p2000 2P3002 2P2003 2p2000 2P4000 2P3003 2P4000 2P3001 6 Call Factory CONTROL BOARD - w/Firmware 7 E2356800 DISPLAY UNIT Mascot LX Boilers and Water 8 E2335100 CIRCUIT BREAKER, 2A Heaters 9 E2318900 CIRCUIT BREAKER, 10 AMP 10 E2357200 SENSOR, DUPLEX, FLUE 11 P2074600 SWITCH, LOW PRESSURE 12 P2074500 VENT, AIR, AUTO 13 E2357300 2-Jun-14 GROMMET, SENSOR, FLUE Laars PN Description 14 E2357500 SENSOR, OUTLET 1 P2067603 PVC,BLOWER/ 3/4" SCH
LAARS Heating Systems H2364000A Dimensions and specifications subject to change without notice in accordance with our policy of continuous product improvement. Customer Service and Product Support: 800.900.9276 • Fax 800.559.1583 Headquarters: 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.