Mascot® LX
Contents
1. CENTRAL HEAT IN CONNECTION RETURN WATER BOTTOM 2 SCREWS iN VIEW USER INTERFACE ON OFF DHW SWITCH HOT OUT TEMPERATURE DHW FLAT PLATE PRESSURE GAUGE HEAT EXCHANGER COMBINATION BOILERS ONLY DHW COLD IN D 2 SCREWS J CENTRAL HEAT IN CONNECTION COMBUSTION INLET RETURN WATER EXHAUST LOW VOLTAGE SERVICE HATCH FIELD CONNECTION TERMINALS GAS SUPPLY COMBUSTION AUTOMATIC o AIR VENT LOW WATER CUT OFF GAS VALVE OPTIONAL HEAT EXCHANGER WATER PRESSURE ASME TAG SWITCH HEAT EXCHANGER BLOCKED VENT PRESSURE SWITCH SHOWN WITH THE FRONT PANELS OFF 4 a AND A SIDE PANEL MISSING FOR VISUAL TANKA PURPOSES 3 WAY VALVE PUMP CENTRAL HEAT OUT CONNECTION SUPPLY WATER es a FOLDS DOWN dt s Fe TO OPEN Sa ATE HIGH VOLTAGE FIELD CONNECTION TERMINALS Figure 2 Location of Components Page 2 LAARS Heating Systems 1 Caring For Your Mascot LX Your Mascot LX will require very little maintenance However as with any fine appliance there are certain steps that should be taken to ensure continuing optimum performance 1 1 General Care Keep the area around the Mascot LX clean and free from combustible materials gasoline and other flammable liquids and vapors The Mascot LX must be completely isolated and protected from any source of corrosive chemical fumes such as trichlorethylene perchlorethylene chlorine etc Keep bottom and top openings on the2. boiler free for proper ventilation of interior components Do not obstruct or block a free flow of air to the boiler to ensure proper ventilation If desired clean the jacket surfaces with a damp cloth and mild detergent Do not use flammable cleaning materials If sidewall vented keep the vent terminal clear of obstructions do not pile snow against the vent terminal Clean the intake screen often and then develop an appropriate maintenance schedule 1 2 Annual Inspection of Flue and Vents Visually inspect the vent pipe once a year Should any deterioration exist have the affected parts replaced by a qualified service person 1 3 In the Event of a Power Failure The Mascot LX can not be operated during an electrical power outage If there is an extended power outage with danger from freezing then the Mascot LX and all other water systems should be drained completely When draining the boiler turn off main electrical disconnect switch When placing back in service refer to Section 2 of this Manual for instruction All draining and filling must only be done by a qualified service person 1 4 Full Service Every Three 3 Years In addition to the annual visual inspections a qualified service agency should conduct a detailed inspection of all flue product carrying areas of the boiler and its venting system 2 Filling Shut Down and Restart 2 1 Filling the Boiler System 1 Ensure the system is fully connected Close
3. 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 Repeat this process for Terminal B and GND To configure the control system identify which boiler is going to be the master boiler for the cascade system and navigate to installer parameter P06 Cascade Address Set the address to 0 and press and hold select When auto cfg appears on the display press select to start the auto configuration process The auto configuration process will find all boilers connected to the master boiler and assign addresses When auto configuration is complete the display should show boilr where is the total number of boilers found in the cascade system The final steps are to set the individual setpoints in the cascade system which include P07 Cascade Setpoint P08 Cascade off Hysteresis and P09 Cascade on hysteresis These variables must be set to the appropriate values for the installation When setting P09 cascade on hysteresis the value should NOT be less than PO8 Cascade off Hysteresis as P09 references the off point P
4. 07 P08 as the starting point for the on hysteresis An example of this is shown below Correct settings P07 120 F P08 10 F P09 20 F With these setting the modulation point is 120 F The off point is 120 F 10 F 130 F The on point is 130 F 20 F 110 F Incorrect settings P07 120 F P08 10 F P09 5 F With these setting the modulation point is 120 F The off point is 120 F 10 F 130 F The on point is 130 F 5 F 125 F In this case the boiler is turning back on prior to reaching the modulation point which could lead to short cycling 3 9 1 Cascade Manual Configuration In some applications it may be necessary to configure the cascade system manually To do this the boilers should be wired as shown in the Auto Cascade section of the manual Then each individual control in the cascade must have a specific address assigned by adjusting P06 Cascade address on each boiler To start identify the boiler that will be the master boiler Navigate to parameter P06 cascade address set to 0 and press Select do NOT press and hold select Then press and hold select Repeat this process for each boiler in the cascade setting each address to a unique number The last step is to adjust all of the setpoints for the installation application as shown in the Auto cascade section of the manual LAARS Heating Systems Dimensions and specifications subject to chang
5. User s Manual Document 1286A User s Information for MASCOT LX Wall Mounted Modulating Boiler Model MLXH 50 75 100 125 150 175 amp 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 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 Heating Systems Company A subsidiary of BRADFORD WHITE Corporation AVERTISSEMENT Assurez vous de bien suivres les instructions donn es dans cette notice pour r du
6. 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 3 If a water pressure regulator is provided on the make up water line adjust the pressure regulator to provide at least 12 psi 81 8 kPa at the highest point in the heating loop 4 Open bleeding devices on all radiation units at the high points in the piping throughout the system unless automatic air bleeders are provided at such points Note that there is an air bleed located on the left side of Mascot LX on top of the jacket 5 Cycle the boiler pump on and off 10 times 10 seconds on and 10 seconds off to remove all air from the heat exchanger Then run system and appliance pump for a minimum of 30 minutes with the gas shut off 6 Using manual lever located on left side of 3 way valve actuator move from open position back to closed position repeatedly This process forces air out of the internal DHW loop WARNING Failure to remove all air from the heat exchanger could lead to property damage severe injury or death 7 Recheck all air bleeders as described in Step 4 8 Shut down the entire system and vent all radiation units and high points in the system piping as described in Step 4 9 Close make up water valve and c
7. e without notice in accordance with our policy of continuous product improvement L O LE O Pe Aan amas CERTIFIED www ahridir Ask About Our Certified Products C US N ENERGY STAR Low Lead Content I NSF ANSI 372 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 L 3 pan A peer ee t aps re www Laars com Litho in U S A Laars Heating Systems 1410 Document 1286A
8. h tout dommage materiel toute blessure ou la mort Do not store or use gasoline or other flammable Ne pas entreposer ni utiliser d essence ou ni vapors and liquids in the vicinity of this or any d autres vapeurs ou liquides inflammables a other appliance proximit de cet appareil ou de tout autre appareil WHAT TO DO IF YOU SMELL GAS QUE FAIRE SI VOUS SENTEZ UNE ODEUR DE GAZ e Do not try to light any appliance e Ne pas tenter d allumer d appareils e Do not touch any electrical switch do not use any e Ne touchez a aucun interrupteur Ne pas vous phone in your building servir des t l phones dans le b timent o vous e Immediately call your gas supplier from a vous trouvez neighbor s phone Follow the gas supplier s e Appelez imm diatement votre fournisseur de instructions gaz depuis un voisin Suivez les instructions du e If you cannot reach your gas supplier call the fire fournisseur department e Si vous ne pouvez rejoindre le fournisseur de gaz appelez le service des incendies Installation and service must be performed by a qualified installer service agency or the gas L installation et l entretien doivent tre assur s par supplier un installateur ou un service d entretien qualifi ou par le fournisseur de gaz Page 4 LAARS Heating Systems 3 The User Interface and the Digital Display MASCOT LX Figure 3 The User Interface 3 1 Digital Display The centerpiece of the User I
9. heck strainer in pressure reducing valve for sediment or debris from the make up water line Reopen make up water valve 10 Check gauge for correct water pressure and then the system is ready for operation 11 Refer to local codes and the make up water valve manufacturer s instructions as to whether the make up water valve should be left open or closed 12 After placing the unit in operation the ignition system safety shutoff device must be tested Shut off the manual gas valve and call the unit for heat Main gas valve will be energized attempting to light for four 4 seconds and then will de energize The unit will go into lockout after the required number of trial for ignition periods Press the manual reset button on the boiler control or the user display open the manual gas valve and allow the unit to light While the unit is operating close the manual gas valve and ensure that power to the main gas valve has been cut 13 Within three 3 days of start up recheck all air bleeders and the expansion tank as described in Steps 4 and 8 above User s Manual Mascot LX Boilers and Water Heaters Page 3 WARNING 7 2 Shutting Down Mascot LX Improper adjustment may lead to poor combustion Turn off the main electrical disconnect switch quality increasing the amount of carbon monoxide 2 Close all manual gas valves produced Excessive carbon monoxide levels may 3 If freezing is anticipated drain Mascot LX a
10. ire au minimum le risque d incendie ou d explosion ou pour viter tout dommage mat riel 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 aucun interrupteur Ne pas vous servir des t l phones dansle b timent o vous tes Appelez imm diatement 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 entretien doivent tre assur s par un installateur ou un service d entretien qualifi ou par le fournisseur de gaz LAARS Heating Systems CONTENTS Pgs Famuiliarizing yourself to the Laars Mascot LX 1 1 Caring For Your Mascot LX uu ceeeeeeeeeeeeeeeeeees 2 2 Filling Shut Down and Restart ss 5 2 3 3 The User Interface and the Digital Display 4 5 118 API S TART 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 FAMILIARIZING YOURSELF TO THE MASCOT LX User s Manual Mascot LX Boilers and Water Heaters Page 1 GAS SUPPLY CENTRAL HEAT OUT CONNECTION SUPPLY WATER
11. lect OK button for five seconds 3 3 Ignition Control Sequence of Events Call for heat Safety chain check Fan starts Prepurge timer is started Pre ignition time of 2 seconds to check the flame sensor operation and status Trial for ignition starts by energizing the spark ignition and opening the gas valve If flame is sensed the control starts the burner to satisfy the demand If the flame is not established the control enters a retry starting again from step 2 If flame is not established after 4 attempts the control will lockout with an E12 error code 7 Call for heat complete Gas valve off 9 Fan and pump over run times active to purge the system Ce EE a i The sequence is the same for DHW or Central Heat modes Upon a call for Central Heat the 3 way valve will shift position allowing boiler water to enter User s Manual Mascot LX Boilers and Water Heaters Page 5 the building s heating loop Only after the value shifts position will the firing sequence begin 3 4 Modulation Control The control uses a PID algorithm to adjust the firing rate of the boiler as the control point is approached The goal of the control is to operate at a minimum firing rate to match the load on the appliance 3 5 Pump Control The boiler pump is active anytime there 1s a call for heat applied to the control When there is a central heat call the system pump relay is active If there is a DHW ca
12. ll while the central heat call is active the system pump turns off This happens because of domestic hot water priority which forces the control to satisfy the domestic water demand prior to the hydronic demand When the last heat demand 1s satisfied the boiler pump enters an overrun time 3 6 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 3 7 Stack Temperature The stack temperature is a dual thermistor sensor and is limit rated The control compares each of the temperature readings to determine accuracy The stack sensor is used as a limiting feature to avoid excessive temperatures in the venting 3 8 Domestic Hot Water Temperature The domestic hot water temperature sensor is used to control the DHW temperature The DHW setpoint can be adjusted through the Base Home state and the User Mode On LX C or Combi models the DHW sensor is pre installed in the DHW exchanger On LX H or Heat models the DHW can be can be controlled by an aquastat or optional DHW sensor installed in an indirect tank 3 9 Cascade Auto Configuration To operate up to 8 boilers in
13. nd be lead to personal injury or death sure to also protect building piping from freezing All water must be removed from heat exchanger and condensate trap or else damage from freezing WARNING may occur Do not use this boiler if any part has been under This step to be performed by a qualified service person water Immediately call a qualified service technician to inspect the boiler and to replace any part of the 2 3 To Restart Mascot LX control system and any gas control which has been If drained please refer back to section 2 1 of under water this manual before restarting 1 Turn off the main electrical disconnect switch 2 Close all manual gas valves FOR SERVICE 3 WAIT FIVE 5 MINUTES Contact your installing contractor gas utility Laars 4 Set the aquastat or thermostat to its lowest setting dealer or call Laars for the nearest authorized 5 Open all manual gas valves representative in your area 6 Reset all safety switches pressure switch manual reset high limit etc 7 Switch on electrical power 8 Burner will go through a prepurge period and ignitor warm up period followed by ignition WARNING AVERTISSEMENT If the information in these instructions is not Assurez vous de bien suivre les instructions followed exactly a fire or explosion may result donn es dans cette notice pour r duire au minimum causing property damage personal injury or le risque d incendie ou d explosion ou pour viter deat
14. nterface is the Digital Display All of the needed parameters of the Mascot LX can be viewed and adjusted on this Digital Display All controls can be adjusted using the Select button and the Up and Down arrows 3 2 Controller Modes Three control modes can be displayed USER INSTALLER AND SERVICE 3 2A The USER Mode The User Mode is for a homeowner or service technician to adjust the most common operating parameters 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 If the System Setpoint is installed 1t can be adjusted but then the Outlet Temperature can no longer be adjusted These parameters can be adjusted in the USER Mode by pressing the Select OK button while in that parameter and then using the Up and Down arrows to set to the desired temperature Once the desired parameter is displayed always press Select OK again to Save that setting 3 2B The INSTALLER Mode The Installer Mode is an extensive set of parameters that can be changed to suit the individual installation and should only be accessed by a trained service technician or installer To access the INSTALLER Mode hold Select OK and the down V arrow key simultaneously until U00 is dis
15. played Press Select OK again and then release Change the value to 15 and then press Select OK again The INSTALLER Mode Parameters will then be accessible by pressing the Up or Down arrows NOTE For the full list of Installer Mode Parameters and full details on using the User Interface please see the Mascot LX Installation and Operating Manual Document 1285 available on laars com To change the value of that parameter press Select OK button again The parameter will blink Pressing the Up or Down arrows will increase or decrease the parameter value The value will be confirmed by pressing Select OK button and the blink will stop The parameter value will return to the previous setting if you press the Cancel button Otherwise Exit INSTALLER Mode by pressing and holding Select OK for 3 seconds 3 2C The SERVICE Mode The Service Mode is intended for servicing and troubleshooting of the unit by a Mascot LX trained service technican The SERVICE Mode can be activated by pressing and holding the Select OK button and Up Arrow simultaneously for five seconds With an active call for heat the boiler will light and run at 100 of firing rate The boilers input can be adjusted in 20 rate increments by pressing the Up or Down Arrows You can also toggle between Maximum Rate and Minimum Rate by pressing the Select OK button To exit SERVICE Mode depress and hold the Se
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