Installation and operation instructions document 1230c h2338100c 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 vicin...
Laars heating systems table of contents section 1. General information 1.1 introduction ........................................................ 2 1.2 rating plate ........................................................ 2 1.3 model nomenclature........................................... 2 1.4 start...
Mascot ii boilers and water heaters page 1 section 9. Modes of operation 9.1 hydronic heating demand................................ 28 9.2 hydronic heating with outdoor reset .............. 28 9.3 hydronic heating using external modulation control............................................ 28 9.4 ...
Laars heating systems page 2 section 1. General information 1.1 introduction this manual provides information necessary for the installation, operation, and maintenance of laars heating systems mascot ii appliances. Read it carefully before installation. All application and installation procedures s...
Mascot ii boilers and water heaters page 3 4. Two more screws 1. Loosen these two screws 2. Fold bottom panel downward 3. Fold center panel downward start up / shut down instruction (decal) is on the back of the top cover rating plate user interface figure 1a. Opening the mascot ii to locate the rat...
Laars heating systems page 4 1.7 appliance overview figure 2. Contents of shipping package. 1) prv, 30 psi 5) exhaust terminal assy 2) prv pipe w/ washer 6) air intake terminal assy 3) wall attach bracket 7) ball valve 4) outdoor sensor 8) system sensor (not shown) 9) flow restrictor (not shown) fig...
Mascot ii boilers and water heaters page 5 figure 3. Dimensional drawing. Cond. Hydronic dhw 2nd gas hydronic dhw 2nd outlet return inlet return supply supply outlet supply 3/4" 3/4" 1/2" 3/4" 1/2" 3/4" 1/2" 3/4" pvc copper npt copper npt npt npt copper 1.8 dimensions.
Laars heating systems page 6 section 2. Locating the appliance 2.1 locating the appliance mascot ii is for indoor, wall-mounted installations only. The appliance should be located to provide clearances on all sides for maintenance and inspection. It should not be located in an area where leakage of ...
Mascot ii boilers and water heaters page 7 figure 4. Locating the appliance. Figure 5. Mounting detail. Figure 6. Wall template (not to scale). Full-size template is included with the unit. Zero clearance is allowed to combustible surfaces. However, the above minimum service clearances are strongly ...
Laars heating systems page 8 the enclosure shall be provided. The openings shall communicate directly, or by ducts, with the outdoors or spaces that freely communicate with the outdoors. When directly communicating with the outdoors, or when communicating to the outdoors through vertical ducts, each...
Mascot ii boilers and water heaters page 9 installation standards material united states canada stainless steel ul 1738 venting must be ulc-s636 certified for use as pvc, sch 40 ansi/astm d178 venting material. The venting material must be chosen cpvc, sch 40 ansi/astm f441 based upon the intended a...
Laars heating systems page 10 important note about common venting: a single vent that is shared by multiple mascot ii units must be engineered by a competent venting specialist, and involves the selection of draft inducing equipment, hardware and controls to properly balance flue gas pressures. Do n...
Mascot ii boilers and water heaters page 11 *when vent terminal is less than 10 feet (3m) horizontally from a forced air inlet, the terminal must be at least 3 feet (0.9m) above the air inlet. Figure 9. Combustion air and vent through side wall. U.S. Installations (see note 1) canadian installations...
Laars heating systems page 12 figure 10. Vent dimensions, 2-pipe system. Massachusetts in massachusetts the following items are required if the side-wall exhaust vent termination is less than seven (7) feet above finished grade in the area of the venting, including but not limited to decks and porch...
Mascot ii boilers and water heaters page 13 follow the lighting instructions. Adjust thermostat so the appliance will operate continuously. 5. Test for spillage at the draft hood relief opening after 5 minutes of main burner operation. Use the flame of a match or candle, or smoke from a cigarette, c...
Laars heating systems page 14 sched 40 metal pipe capacity for 1.50 specific gravity undiluted propane nominal pipe size @ 11" w.C. Inlet and 0.5" w.C. Pressure drop size 1/2" 3/4" length maximum capacity in thousands of btu per hour 20 200 418 40 137 287 60 110 231 80 94 197 100 84 175 notes: 1. Fo...
Mascot ii boilers and water heaters page 15 section 5. Pump capacity 5.1 mascot ii heating system pump capacity heating dhw size conn size conn size 125 3/4" 1/2" table 7. Water connection pipe sizes. When rigid hangers are installed. Maintain 1" (2.5cm) clearance to combustibles for hot water pipes...
Laars heating systems page 16 the boiler piping system of a hot water heating boiler connected to heating coils located in air handling appliances where they may be exposed to refrigerated air circulation, must be equipped with flow control valves or other automatic means to prevent gravity circulat...
Mascot ii boilers and water heaters page 17 6.5 recognized chemicals the following manufacturers offer glycols, inhibitors, and anti-foamants that are suitable for use in the mascot ii. Please refer to the manufacturers instructions for proper selection and application. 1. Sentinel performance solut...
Laars heating systems page 18 figure 15. Hydronic piping — low temp system. Inlet temperature °f 50°f 60°f 70°f gpm temp rise °f 1.0 100 90 81 2.0 90 83 79 3.0 78 76 68 4.0 59 56 51 inlet temperature °c 10°c 16°c 21°c lpm temp rise °c 4 56 50 45 8 50 46 44 11 43 42 38 15 33 31 28 table 8. Dhw and pu...
Mascot ii boilers and water heaters page 19 figure 16. Hydronic piping — multi boilers for large homes with long / multiple baseboard zones. Installer to provide dhw (anti-scald) thermostatic mixing valve..
Laars heating systems page 20 figure 17. Hydronic piping — multi boilers for large homes with long / multiple radiant zones. Installer to provide dhw (anti-scald) thermostatic mixing valve..
Mascot ii boilers and water heaters page 21 figure 18. Hydronic piping — heating zones piped with zone pumps. Installer to provide dhw (anti-scald) thermostatic mixing valve..
Laars heating systems page 22 figure 19. Hydronic piping — heating zones piped with zone valves. Installer to provide dhw (anti-scald) thermostatic mixing valve..
Mascot ii boilers and water heaters page 23 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,...
Laars heating systems page 24 figure 21. Ladder diagram. B. 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. C. Repeat these steps until all modbus port 1 terminal a connections are wired. D. Repeat the above st...
Mascot ii boilers and water heaters page 25 figure 22. Wiring diagram. Blocked vent switch com nc power plug 115v blower 3 1 5 1 g power switch y 24v 115v w bk y transformer 115 vac input 24 vac output 1 2 domestic emp. Sensor 1 2 inlet temp. Sensor circuit breaker 115v "hot" 10a wire guide 24v = 22...
Laars heating systems page 26 section 8. Control setup and operation the mascot ii control is an integrated electronic control that replaces many of the individual components found on older appliances. The control acts as the ignition control, pump control, high limit and cascading/ lead lag control...
Mascot ii boilers and water heaters page 27 8.2 ignition control- sequence of events 1. Call for heat 2. Safety chain check 3. Fan starts. 4. Prepurge timer is started. 5. Pre ignition time of 2 seconds to check the flame sensor operation and status. 6. Trial for ignition period, 4 seconds. The dire...
Laars heating systems page 28 section 9. Modes of operation the mascot ii control allows the boiler to operate in many different modes of operation. The mode must be selected based upon the requirements of the installation. The following sections describe the basic operation of the mascot ii in each...
Mascot ii boilers and water heaters page 29 water temperatures. The boiler setpoint is used to limit the maximum water temperature leaving the boiler only. The modulation rate is controlled by a 4-20ma (0- 10vdc using converter) signal supplied by an external control. When setting up a system using ...
Laars heating systems page 30 system is ready for operation. 12. 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. 13. After placing the unit in operation, the ignition system safety shutoff device must b...
Mascot ii boilers and water heaters page 31 4. Mascot ii 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 ii, check that there is p...
Laars heating systems page 32 gas type co 2 (%) range manifold pressure (inh20) natural 8.8 __ 9.8 3.5 __ 4.5 propane 9.8 __ 10.8 3.5 __ 4.5 table 13. Co 2 range and pressure settings. Figure 25. Adjustment screws and settings for co 2 manifold pressure screw (under cap) high-fire setting low-fire s...
Mascot ii boilers and water heaters page 33 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 i...
Laars heating systems page 34 11.2.4 flame sensor the flame sensor is a single rod system. To replace the flame sensor electrode, shut off the 120 volt power supply to the boiler. Turn off all manual gas valves connecting the boiler to the main gas supply line. Remove the front door of the boiler to...
Mascot ii boilers and water heaters page 35 manufacturer's instruction supplied with the kit. Avertissement ce conversion doit être installé par un organisme de service conformément aux instructions du fabricant et tous les codes et les exigences de l'autorité compétente. Si les informations contenu...
Laars heating systems page 36 code# problem probable cause solution common lockout codes 27 internal error flame rod to ground check wiring / probe grounded, dirty probe 47 flame rod to ground leakage faulty flame detector clean or replace flame detector 49 24vac voltage low/high faulty transformer ...
Mascot ii boilers and water heaters page 37 was reached however the cycle count will not increment any higher than 999,999 cycles replace controller or adjust the count using blue display 50 maximum hours count control operates correctly, was reached however the hours count will not increment any hi...
Laars heating systems page 38 13.2 parts list item description size 125 panel assemblies – see figures 27-30 1 panel, front, top, assy 12h3005 1a panel, top, upper 12h7001 1b screw, captive, .19 x .54 fast lead, phil pan hd f2028100 1c screw, #8-32 x 3/8", phil pan hd f2027100 1d gasket, strip, foam...
Mascot ii boilers and water heaters page 39 item description size 125 item description size 125 burner components - see figure 33 1 burner, main r2069102 2 gasket, burner rs2108500 3 tile, refractory, front, combustion chamber rt2109000 4 ignitor, spark, w/gasket r2069300 5 flame sensor, w/gasket r2...
Laars heating systems page 40 figure 28. Panel assembly, door top..
Mascot ii boilers and water heaters page 41 figure 29. Panel assembly, door middle..
Laars heating systems page 42 figure 30. Panel assembly, door bottom..
Mascot ii boilers and water heaters page 43 figure 31. Base jacket assembly..
Laars heating systems page 44 figure 32. Heat exchanger cabinet, fan..
Mascot ii boilers and water heaters page 45 figure 33. Heat exchanger burner components..
Laars heating systems page 46 figure 34. Pump assembly components..
Mascot ii boilers and water heaters page 47 figure 35. Plumbing components..
Laars heating systems page 48.
Mascot ii boilers and water heaters page 49.
H2338100c 800.900.9276 • fax 800.559.1583 (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. © ...
