Installation and Operation Instructions Document 1320A Installation and Operation Instructions for MASCOT ® FT Floor-Standing, Modulating Gas, Condensing, Combination Boiler Model MFTCF 140,000 BTU/hr 199,000 BTU/hr • Natural Gas (NG) - Factory Configuration • Propane Gas (LP) - Field-Convertible 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 SECTION 1 Product Accessories TABLE OF CONTENTS 1.2 Included with the Appliance................................. 1-2 4.16 Disposal of Condensate.......................................43 4.17 Electrical Wiring Connections............................ 44 4.18 DIP Switches..................................................... 45 SECTION 2 Product Characteristics 4.19 Control Board, Electrical Diagram ..................... 47 4.20 Ladder Diagram.........................................
Page 1 Mascot FT Floor Standing Combination Boiler SECTION 1 Product Accessories 1.1 Introduction This manual provides information necessary for the installation, operation, and maintenance of the LAARS Heating Systems Mascot FT. All application and installation procedures must be read and reviewed completely before proceeding with the installation. Consult the LAARS Heating Systems factory, or your local factory representative, with any problems or questions regarding this equipment.
LAARS Heating Systems Page 2 1.
Page 3 Mascot FT Floor Standing Combination Boiler SECTION 2. Product Characteristics 2.1 Model Nomenclature The Model Nomenclature is shown on your Rating Plate and consists of a series of letters and numbers ( Nomenclature ) that further identifies the characteristics of your Mascot FT. 1 2 3 4 M F T C SERIES Mascot FT 5 7 8 9 F CONFIG C - Combi 6 F - Floor Stnd Figure 1.
Page 4 2.2 18. 19. CO2 at MAX Fire. ONLY in MIN Fire, so... Per Table B for MIN Fire, change dip switch 6 to OFF and 7 to ON. The unit will cycle down to MIN Fire. LAARS Heating Systems WAIT for your combustion analyser to stabilize. Then check the CO2 measurement at MIN fire. Refer to Table D for acceptable MIN fire combustion readings. Specifications 20. 21. If CO2 readings in Max Fire and MIN fire are acceptable, then skip ahead to Step 23.
CO MAX Fire. ONLY MIN Fire,readings. so... Table D for acceptable MIN fireincombustion 2 at , change Table B for MIN FireFire dip switch to OFF and then 7 to ON. unittowill cycle MINopen Fire. the 18. Per If CO readings in Max and MIN fire are6acceptable, skip The ahead Step 23.down If not,tothen Page 5 for your combustion to stabilize. COAllen at Figure MIN fire. Gas Valve Adjustment Portanalyser by removing the capThen screwcheck with athe 4mm wrench. See E.Refer to 19. WAIT 2 measurement 20.
LAARS Heating Systems Page 6 2.3 Dimensions 3.0" 7.6 cm MFTCF140 3.3" 8 cm 15.7" 40 cm 9.2" 23 cm TOP 3” O EXHAUST VENT 26.7" 3” O AIR INLET 20.5" A GAS CONNECTION 9.3" 39.3" 2.7" 4.3" 52.4" 133 cm 30" C HYDRONIC SUPPLY HYDRONIC RETURN B D E 4.3" 27.3" 5.8" 23" 18.7" 9.2" 12.9" 3.7" FRONT 68 cm F DHW OUTLET DHW INLET CONDENSATE G DRAIN ADAPTER 19.7" 23.
Page 7 Mascot FT Floor Standing Combination Boiler 3.0" 7.6 cm 5.0" 13 cm MFTCF199 4.0" 10.4 cm Note; The greatest installation difference between the MFTCF140 and MFTCF199, other than general output capability (BTU’s), is that the air inlet and exhaust vent are opposite. See Section 2.4 6.6" 16.9 cm 15.7" 40 cm TOP 3” O AIR INLET 68 cm 26.7" 3” O EXHAUST VENT 17.9" GAS CONNECTION A 18.9" 48.3" 2.6" 53.7" 137 cm 4.3" 29.4" HYDRONIC SUPPLY HYDRONIC RETURN B D E 4.3" 26.8" 5.7" 22.5" 18.
LAARS Heating Systems Page 8 2.
Page 9 Mascot FT Floor Standing Combination Boiler MFTCF199 Note; The greatest installation difference between the MFTCF140 and MFTCF199, other than general output capability (BTU’s), is that the air inlet and exhaust vent are opposite.
LAARS Heating Systems Page 10 2.5 Product Flow Paths and Characteristics 2.5.1 Central Heating flow. Combination Boiler Heating Mode. Water in the heating pipe is used for space heating. haracteristics Operating Mode Space Heating Water Supply eating mode. (Central Heating = CH mode) Space Heating Water Return used for space heating.
Mascot FT Floor Standing Combination Boiler Page 11 2.5 Product Flow Paths and Characteristics uct Characteristics 2.5.2 Domestic Hot Water flow. Operating Mode Combination Boiler Domestic Hot Water Mode. Cold water passes through the exchanger and is heated via a mini indirect tank. The domestic hot water (DHW) is provided on demand. r of Hot water mode. (Domestic Hot Water = DHW mode) e ‘Sub heat exchanger’, then cold water transformed into hot water. er (DHW) is controlled by the consumer.
LAARS Heating Systems Page 12 SECTION 3. Safety Regulations 3.1 Safety Symbols WARNING To avoid product damage, personal injury, or even possible death, carefully read, understand, and follow all the instructions in the Installation and Operation manual before installation, operation and service the Boiler. Laars cannot anticipate every circumstance that might involve a potential hazard. Therefore, all possible incidents are not included in our warnings.
Page 13 Mascot FT Floor Standing Combination Boiler damaging condition that might affect the operation of the unit. Boiler must be checked by a qualified technician before resuming operation. DANGER Vapors from flammable liquids can explode and catch on fire, resulting in severe burns or death. Do not use or store flammable products such as gasoline, solvents or adhesives in the same room or area near the appliance.
LAARS Heating Systems Page 14 SECTION 3. Safety Regulations 3.2 Safety Precautions and Proper Use When in Operation Before Operation 1. Check the Gas Type (NG/LP) When using or moving the unit for the first time, check if gas type matches with the gas type of the Boiler. Check whether the gas type which is supplied is NG (Natural Gas) or LP (Propane) and also check the Boiler gas type. The gas type is indicated on the rating plate on side of the Boiler. 2.
Page 15 Mascot FT Floor Standing Combination Boiler WARNING Do not use the appliance for any other purpose than for heating and hot water. Do not store combustibles or flammable material such as gasoline near the appliance. Do not store other items on or near this boiler. Do not store combustible (flammable) materials such as papers. Do not hang clothes on the vent pipe. This may start a fire. Burn Protection Be cautious when opening the hot water tap. The water is very hot.
LAARS Heating Systems Page 16 SECTION 4. Installation 4.1 Location and Clearances 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 any connections will result in damage to the area adjacent to the appliance or to lower floors of the structure. When such a location is not available, it is recommended that a suitable drain pan, adequately drained, be installed under the appliance.
Mascot FT Floor Standing Combination Boiler WARNING Installations must comply with • All the local, state, provincial, and national codes, laws, regulations and ordinances. • National Fuel Gas Code, ANSI Z223.1 – The latest version. • National Electrical Code. • A National Standard of Canada CAN/CSA-B149.1 Check before placing the Combination boiler • Always check the connected components which are near to the heater. The components are below.
LAARS Heating Systems Page 18 SECTION 4. Installation 4.3 Combustion Air Mascot FT boilers must have provisions for combustion and ventilation air in accordance with the applicable requirements for Combustion Air Supply and Ventilation in the National Fuel Gas Code, ANSI Z223 1; or in Canada, the Natural Gas and Propane Installation Code, CSA B149.1. All applicable provisions of local building codes must also be adhered to.
Page 19 Mascot FT Floor Standing Combination Boiler NOTICE The instructions for the installation of the venting system shall specify that the horizontal portions of the venting system shall be supported to prevent sagging; the methods of and intervals for support shall be specified.
LAARS Heating Systems Page 20 SECTION 4. Installation 4.4 Venting (Exhaust) AVIS NOTICE DO NOT COMMON VENT MASCOT FT UNITS. Mascot FT units are never permitted to share a vent with Category I appliances. NE PAS ÉVENT COMMUNE MASCOTTE FT UNITÉS. Mascotte FT unités ne sont jamais autorisés à partager un évent Catégorie I avec les appareils. ___________________________________________ The flue temperature of the Mascot FT changes dramatically with changes in operating water temperature.
Page 21 Mascot FT Floor Standing Combination Boiler with alternate manufacturers certified components and/or unlisted components. 5 . The venting must be installed according to the vent manufacturers installation instructions. The unit’s vent can terminate through the roof, or through an outside wall. Vent pipe must pitch upward, toward the vent terminal, not less than 1/4” per foot, so that condensate will run back to the Mascot FT to drain. Route vent pipe to the heater as directly as possible.
LAARS Heating Systems Page 22 SECTION 4. Installation 4.6 Locations for Vent Pipe Terminator * For clearances not specified in ANSI Z224.1 / NFPA 54 or CAN/CSA-B 149.1, please use clearances in accordance with local installation codes and the requirement of the gas supplier. 4.6.
Page 23 Mascot FT Floor Standing Combination Boiler 4.6.
LAARS Heating Systems Page 24 SECTION 4. Installation 4.6.3 V enting Requirements in the Commonwealth of 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 porches. From Massachusetts Rules and regulations 248 CMR 5.08 1.
Page 25 Mascot FT Floor Standing Combination Boiler NOTICE DO NOT COMMON VENT MASCOT FT UNITS. Mascot FT units are never permitted to share a vent with Category I appliances. AVIS NE PAS ÉVENT COMMUNE MASCOTTE FT UNITÉS. Mascotte FT unités ne sont jamais autorisés à partager un évent Catégorie I avec les appareils. Common Vent Test NOTE: This section does not describe a method for common venting Mascot FT units.
LAARS Heating Systems Page 26 SECTION 4. Installation 4.7 Air Supply and Vent Connections at the Appliance Combination Boiler Model MFTCF140/199 Table 6. 3˝ Combustion Air / Vent Pipe 2˝ Combustion Air / Vent Pipe Max Elbow Max Max 100´ (30M) 6 50´ (15M ) * Elbow Max * 4 Maximum Vent / Air Pipe Lengths for either 3” or 2 “ Pipes *Propane models are limited to 25 equivalent feet of 2” vent Note : For additional elbows, reduce maximum allowable length • 5 feet (1.
Mascot FT Floor Standing Combination Boiler Page 27 4.7.3 Indoor Combustion Air Read and Follow Sections 4.3 Guidelines First. Shown is the MFTCF140. The inlet and outlet are reversed on the MFTCF199. 1. Insert the termination end cap into the intake air duct. 2. Provide two openings to allow for circulation of combustion air as specified by ANSI Z224.1/NFPA 54. In Canada refer to CAN/CSA B-149.
LAARS Heating Systems Page 28 SECTION 4. Installation 4.
Page 29 Mascot FT Floor Standing Combination Boiler 4.9 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. Mascot FT will function properly at elevations up to 10,000 feet (3050 m). Refer to Section 4.12 for High Altitude Settings. 2.
LAARS Heating Systems Page 30 SECTION 4. Installation 4.9 Gas Supply and Piping he gas connection fitting on the unit is T 1/2”(MFTCF140) or 3/4”(MFTCF199) female NPT. The supply line must be sized for the maximum output of the combination boiler model being installed. If there are additional gas appliances from the main supply line, you must measure sizes of the supply line according to the COMBINED total maximum BTUH draw for the appliances as if they were all operating at the same time.
Page 31 Mascot FT Floor Standing Combination Boiler 4.9 Gas Supply and Piping Combination boiler must be installed downstream of the gas meter for adequate gas supply. Combination boiler gas connection pipe not less than a 1/2” (MFTCF140) or 3/4” (MFTCF199).
LAARS Heating Systems Page 32 SECTION 4. Installation 4.10 Gas Supply Pressure The minimum and maximum inlet gas line pressures must be LP Gas Natural Gas Maximum Pressure 13.0" WC Maximum Pressure 10.5" WC Minimum Pressure 8.0" WC Minimum Pressure 3.5" WC CAUTION The appliance and its individual shutoff valve must be disconnected from the gas supply piping system during any pressure testing of the system at test pressures in excess of 1/2 psi (3.5 kPa).
Page 33 Mascot FT Floor Standing Combination Boiler 4.12 High Altitude Installations and Orifices The Mascot FT is shipped with a Natural Gas Nozzle or Orifice that is designed for altitudes up to 3,000 ft. Yet the Mascot FT may be installed (without modification) at elevations up to 10,000 ft, as the unit will de-rate at high altitudes. Mascot FT’s that have been converted to propane will also de-rate at high altitudes up to 10,000 ft.
LAARS Heating Systems Page 34 SECTION 4. Installation Mascot FT Gas Floor-Standing Gas Conversion Kit 4.13 Natural to Propane Conversion Laars Kit Document #4290 Kit # R20771 H2373900A Document 4290A Top Access Panel Front Panel Knob The Laars Mascot FT condensing gas boiler is configured for Natural Gas (NG) from the factory. If your gas supply is Propane Gas (LP), your boiler can be converted to burn propane gas.
Page 35 Mascot FT Floor Standing Combination Boiler Mascot FT Floor-Standing Gas Conversion Kit 3. 4. 5. Document 4290A Using a Phillips screwdriver, remove the 4 screws on the Top Access Panel, and then lift out the Top Access Panel. Unthread the Front Panel Knob at the top of the front panel and then remove the entire panel. See Figure A. With the internal components exposed, locate the gas inlet pipe of your model. See Figure B.
LAARS Heating Systems Page 36 SECTION Installation Gas Conversion Kit Mascot FT4.Floor-Standing Document 4290A 4.13 Natural Gas to Propane Conversion ON OFF MIN Fire Normal Operation MAX Fire Normal Operation NG Natural LP Propane 3” Vent Size 2” Vent Size ON E REF MBH R CE ENON OFF OFF ON N/A 140 Y. ONL OFF DO ON OFF OT NON N/A ON GE N A C H ON ON 199 Table B DIP Switch Settings 15. Setup your combustion analyser and place the sensor 16.
Page 37 Mascot FT Floor Standing Combination Boiler SECTION 4. Installation M4.13 ascot FT Floor-Standing Gas Conversion Kit Natural Gas to Propane Conversion MFTCF199 MFTCF140 - Gas Valve Adjustment Port (under the cap screw) Manifold Pressure Port Figure E 22. + + Document 4290A - It may be necessary to go back and forth between HI Fire and LOW Fire several times (and making adjustments ONLY at LOW Fire), before CO2 at both are within acceptable levels.
LAARS Heating Systems Page 38 SECTION 4. Installation 4.14 Plumbing Guidelines External Plumbing and Water Connection Guidelines - Ensure pipe material meets local codes and industry standards. - The pipe end must be clean and free of debris. - Do not apply torch heat within 12˝ of the bottom connections of the unit. - The size of the DHW pipe should be 3/4˝ diameter and central heating water pipe should be 1˝ diameter. - Isolation valves(Shutoff valve) will be used.
Page 39 Mascot FT Floor Standing Combination Boiler SECTION 4. Installation 4.14 Plumbing Guidelines Diaphragm Type Expansion Tank - The air in a diaphragm-type expansion tank is separated from the water by a flexible rubber membrane. When the tank is installed in and connected to the piping of the system, water enters the other side of the tank chamber and presses down on the diaphragm.
LAARS Heating Systems Page 40 SECTION 4. Installation 4.14 Plumbing Guidelines Zoning with Circulation Pump - Each heating zone of a pump based system has its own circulator pump which runs when the zone needs it. - Each zone thermostat goes to a controller which controls the pumps.
Page 41 Mascot FT Floor Standing Combination Boiler SECTION 4. Installation 4.14 Plumbing Guidelines Zoning with Zone Valve - In a valve based system, there is one circulator pump at the boiler and each heating zone has a zone valve which opens when the zone. - Each thermostat is wired directly to the corresponding zone valve. Contacts in the zone valves provide a proper signal to the boiler when the valve is opened.
LAARS Heating Systems Page 42 SECTION 4. Installation 4.15 Pressure Relief Valves External pressure relief valves must be installed. Observe the following. Failure to comply with the guidelines on installing the pressure relief valve and discharge piping can result in personal injury, death or substantial property damage. WARNING Do not operate this combination boiler before installing a Pressure Relief Valve (PRV) that is rated in accordance with the ASME Rating Plate on the boiler.
Page 43 Mascot FT Floor Standing Combination Boiler SECTION 4. Installation 4.16 Disposal of Condensate High efficiency gas condensing Boilers create condensation when operating. Condensation has acidic (pH) of approximately 4-5. Condensate must be drained in accordance with all local regulations. Follow your local code with regards to the disposal of condensation. One of 4 disposal methods must be followed 1. to floor drain 2. to neutralizer (optional kit) 3. to laundry tub 4.
LAARS Heating Systems Page 44 SECTION 4. Installation 4.17 Electrical Wiring Connections WARNING Install wiring and electrically ground boiler in accordance with authority having jurisdiction or, in the absence of such requirements, follow the National Electrical Code, NFPA 70, and/or CSA C22.1 Electrical Code-Part 1 in Canada.
Page 45 Mascot FT Floor Standing Combination Boiler SECTION 4. Installation 4.18 DIP Switches Mascot FT Floor-Standing Gas Conversion Kit DIP switches 6 and 7 have to be set in the OFF position when the boiler is running normally. E REF MBH R ON OFF MIN Fire Normal Operation MAX Fire Normal Operation NG Natural LP Propane 3” Vent Size 2” Vent Size ON OFF .
M 6 5 4 3 1 4 6 12 11 10 9 P W R Y 8 2 2 5 P W R W W Burner Limit Unused APS Heat Demand Water Level Sensor Condensate Blocking limit 0~10V Outdoor Input Sensor Y BL R BK R 10 O O R R 15 16 8 W 7 BL BL 5 14 R W 11 P 4 W 3 R 6 13 12 2 G P CN6 CN11 DHM BLDC MOTOR M BR O BL BK R W G Y GND DHM Position Sensor DC 14V DHM X Phase DHM Y Phase DC 14V DHM /X Phase DHM /Y Phase 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 CN8 MCU_WRITE SW1 INSTALL CAPACITY CN14 (BK
Page 47 Mascot FT Floor Standing Combination Boiler SECTION 4. Installation HOT 4A 4.
LAARS Heating Systems Page 48 SECTION 4. Installation 4.
Page 49 Mascot FT Floor Standing Combination Boiler SECTION 4. Installation 4.21 Electrical Connections Connector #, Location, Type PIN 1 SELV (5VDC) OP.S Operation water temperature sensor SELV (5VDC) DH.S DHW temperature sensor SELV (5VDC) CH Return sensor SELV (5VDC) BG.S Exhaust temperature sensor SELV (5VDC) ST.S Storage water temperature sensor SELV (5VDC) SP.
LAARS Heating Systems Page 50 SECTION 5. Control Display and Operation 5.1 Control Dial and Buttons The Control Display Status Light (constant green when operating normally) The Control Display has a Control Dial (E), 4 buttons (A, B, C, D), and a Liquid Crystal Display (with 72 back-lit segments). This section of this manual gives instruction on how to navigate into the many functions of the Mascot FT and to change temperature set points, set system variables and controller parameters.
Page 51 Mascot FT Floor Standing Combination Boiler SECTION 5. Control Display and Operation CH Central Heat Anti-Freeze Mode Storage Heating 5.
LAARS Heating Systems Page 52 SECTION 5. Control Display and Operation 5.3 Operating Mode Operating Mode After the Power is turned on, and/or the Control Display is turned on , the Control Display will go through a ‘Start Up’ checklist and briefly show a sequence of diagnostic codes before entering into the ‘Operating Mode. It will then display the following information.
Page 53 Mascot FT Floor Standing Combination Boiler SECTION 5. Control Display and Operation 5.
LAARS Heating Systems Page 54 SECTION 5. Control Display and Operation 5.5 DHW Set Point Change Mode DHW Set Point Change Modes The display shows the following information when changing water heating temperature set points. Changing between Celsius and Fahrenheit When the button D is pressed (for more than 5 seconds), temperature unit will toggle between °C and °F.
Page 55 Mascot FT Floor Standing Combination Boiler SECTION 5. Control Display and Operation 5.6 CH Set Point Change Mode Changing between Celsius and Fahrenheit When the button D is pressed (for more than 5 seconds), temperature unit will toggle between °C and °F.
LAARS Heating Systems Page 56 SECTION 5. Control Display and Operation 5.8 Installer Mode These changes are to be made only by a qualified technician. To c hange any of the Installer Parameters, Start by turning OFF the Power to the Display Control. Then, with the power to the Display Control OFF, Press and HOLD (more than 5 seconds) the Button B to get into the Installer Mode. Rotate Dial E until you find the Installer Parameter (full list on facing page) that you wish to change.
Page 57 Mascot FT Floor Standing Combination Boiler SECTION 5. Control Display and Operation Index 5.
LAARS Heating Systems Page 58 Outdoor Reset varies the control setpoint based on the outdoor temperature. The reset function works as shown in Figure ‘CH Outdoor Reset’. When the outdoor air temperature reaches 6:OH “high outdoor temperature setpoint”, the control point setting is adjusted to 17:cL “low boiler temperature setpoint”. When the outdoor air temperature reaches 7:OL “low outdoor temperature setpoint” the control setpoint is adjusted to 16:cH “high boiler temperature”.
Page 59 Mascot FT Floor Standing Combination Boiler 5.11 Error Mode Flashing Indicate Example Error ‘ Er : ’ will flash Er:11 Error Code Er:11 Display and Controller are communicating NOTE: When communication between the Control Display and the main controller is lost, the will not be displayed.
LAARS Heating Systems Page 60 SECTION 6. Error Codes Error Code Error Code Description Possible Remedies Recover methods Flame has Extinguished 8 (Eight) Times Press the Power button to clear the Error Code. If Error happens again: 1. Monitor the gas pressure to the appliance while in operation. Ensure pressure is between 3.5 and 14” WC. 2. Check gas valve wire. Ensure connection is secure. 3. Check flame detection sensor. Ensure connections are secure. Normal operating settings are more than 2.
Page 61 Mascot FT Floor Standing Combination Boiler SECTION 6. Error Codes (continued) Error Code Error Code Description Possible Remedies Recover methods Venting (Exhaust) Sensor Open or Short This Error Code will go away when exhaust temperature decreases. If Error happens again: 1. Check Venting (exhaust) temperature sensor. Ensure connections are secure. 2. Check sensor resistance. If resistance is zero, replace the sensor. 3. Check vent pipes for blockage. 4.
LAARS Heating Systems Page 62 SECTION 6. Error Codes (continued) Error Code Error Code Description 66 Mixing Valve Initial Value Error (Mixing Valve Cannot Return to Initial Position) This Error Code will go away when the condition is remedied. If Error happens again: 1. Turn power OFF and ON at the main power switch internal to the appliance. 2. Check wiring connections to mixing valve. Ensure all are secure. 3. Replace mixing valve. 4. If the problem persists, replace the main control.
Mascot FT Floor Standing Combination Boiler 6.2 Fault Tree Analysis 1.
LAARS Heating Systems Page 64 6.2 Fault Tree Analysis 2. Gas Detection 3.
Page 65 Mascot FT Floor Standing Combination Boiler SECTION 7. Trouble Shooting Question 7.1 Diagnostics Answer Make sure that the ON/OFF button on the Control Panel has been turned ON. If the monitor on the Control Panel is blank, make sure the power cord is plugged and 4A fuses on the main controller in the units are good. Burner dose not ignite when the hot water is opened. Make sure that there is water supplied to the unit. The unit activates once the inlet water flow is over 0 gpm.
LAARS Heating Systems Page 66 7.2 Suggested Corrective Actions This controller is able to record information about the boiler’s condition at the time of the five previous faults or errors. Refer to the Section ‘5.10 Error Mode’ of this manual. Display Nothing shown on display control panel and blower running at full speed. Nothing is shown in display control panel and no other boiler components are operating. Nothing is shown on control panel, but boiler is operating.
Page 67 Mascot FT Floor Standing Combination Boiler SECTION 7. Trouble Shooting Fault TEMPERATURE SENSOR FLAME FAULT Condition Occurs when a temperature sensor has electrically shorted (SHORT) or has become disconnected (OPEN). Occurs when flame is detected when there should be no flame. 7.
LAARS Heating Systems Page 68 SECTION 8. Maintenance Regular Maintenance - This Manual should be placed in a safe and dry location near the Combination boiler. Maintenance instructions should be carried out by the following guidelines. Maintenance procedures [ Daily ] - Check that the boiler casing is closed. Check if there is any problem with the Combination boiler casing and the two upper and lower screws are tightened well. Combination boiler casing must be closed while it is running.
Page 69 Mascot FT Floor Standing Combination Boiler SECTION 8. Maintenance - Check the air vent If the air vent valve seems to work freely without leaking, replace cap “A” by twisting all the way on. Loosen cap “A” one turn to allow vent to operate. If vent does not operate correctly, replace the vent. 8.1 Annual startup & general maintenance - Check the pressure relief valve WARNING Leaks must be fixed by a qualified service technician immediately.
LAARS Heating Systems Page 70 8.2 Flushing or Draining Flushing the Heat Exchanger is a complicated procedure that should only be done by an authorized technician or licensed professional. Keep in mind that improper maintenance can void your warranty. V1 V3 V4 V2 1. Disconnect electric power to the combination boiler. 2. Close the shutoff valves on both hot water outlet and cold water inlet lines. (V1 & V2) 3. Connect one hose “D1” to the valve “V3” and place the free end in the bucket.
Page 71 Mascot FT Floor Standing Combination Boiler Section 9 – Installation Check 9.1 Quick View Before Installing - Make sure that there is enough space for installing Water and gas line. Verify vent/air termination is located as required. - All models need for propane Conversion which requires a separate gas conversion manual. Install Water Piping - Boiler loop piping must be sized to the minimums listed in the Boiler manual. Using smaller piping will cause performance problems.
LAARS Heating Systems Page 72 9.2 Final Check Lists (continued) Final check : Connecting the power supply • Please check that the power is 120V AC.
Mascot FT Floor Standing Combination Boiler Page 73
LAARS Heating Systems Page 74 SECTION 6. Parts List and Illustrations.
Mascot FT Floor Standing Combination Boiler 1-Jul-15 For IOM No. 1 15 15-1 15-2 16 16-1 16-2 16-3 16-4 16-5 16-6 16-7 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 2 4 Description O-Ring, P7 Air Intake Duct Ass'y Intake adaptor (in) Intake adaptor (out) Exhaust Duct Ass'y Stainless band Packing Exhust adaptor (in) Exhaust testing cap O-Ring P85 Exhaust adaptor (out) O-Ring P75 Upper AS Cover Bolt Air pressure sensor PCB PCB BK Terminal Block Temp.
LAARS Heating Systems Page 76 CASE MFTCF199 13 12 12-1 12-2 12-4 13-1 12-3 12-5 12-6 12-7 No.
Page 77 Mascot FT Floor Standing Combination Boiler No. Description Part # Q’ty Price 13 Air intake duct assembly FT1002 1 $8.50 Air intake duct FT1611 14 Upper A/S Cover FT1613 15 Air pressure sensor FT1804 16 Control B/K FT1617 17 Control (PCB) FT1616 1 $55.0 18 Terminal block FT1827 1 $2.0 19 Temp. control B/K FT1619 20 Power switch FT1020 5 $2.0 21 Condensate collector B/K FT1828 22 Display panel(P-920C) FT1620 1 $20.
Page 78 Heat Exchanger MFTCF140 LAARS Heating Systems
78 CH return pipe (below) FT1675 79 CH outlet pipe (below) FT1676 80 Clamp (34 pie) Mascot FT Floor Standing Combination FT1677 Boiler 81 Condensate hose (EPDM) FT1678 82 Clamp (40 pie) FT1679 83 Condensate trap Assembly FT1328 1-Jul-15 For IOM 84 Condensate outlet hose FT1681 85 Clamp (23 pie) FT1682 Part No.
LAARS Heating Systems Page 80 Heat Exchanger B-2 MFTCF199 56 57 60-1 B-11 1 62 61 56 B-2 63 55 58 64 65 60 8 8 59 66 8 69 8 B-19 5 72 8 60-2 67 73 8 8 60-3 70 59-4 74 68 B-1 8 60-7 75 67 75-1 76 8 77 71 8 3 78 60-8 11 B
65 60 Mascot FT Floor Standing Combination Boiler 8 69 No. Description Part # 1 O-RING P7 FT1601 3 O-RING P16 FT1643 5 O-RING P 22 FT1644 8 1" Packing FT1691 10 Description Clip for flow sensor 56 Exhaust sensor5 57 8 B-19 8 60-1 67 71 B-21 60-5 60-6 B-18 60-9 8 5 $5.0 FT1823 60 Below packing for internal pipe FT1836 61 Heat exchanger FT1837 73 FT1796 61-2 Burner upper case FT1760 61-3 Burner packing FT1824 60-2 1 $9.0 1 $55.
LAARS Heating Systems Page 82 Domestic Hot Water MFTCF140 1-Jul-15 For IOM No. 1 9 13 15 14 15-1 46 15-2 47 16 48 16-1 49 16-2 50 16-3 51 16-4 52 16-5 53 16-6 54 16-7 55 17 56 18 57 19 58 20 59 21 60 22 61 23 10 24 11 25 87 26 88 27 89 28 89-1 29 89-2 30 89-3 31 Description O-Ring, P7 1" PACKING ClipIntake for Cold water inlet 1 Air Duct Ass'y Clip foradaptor Cold water Intake (in) inlet 2 DHW Tank Intake adaptor (out) Temp.
Page 83 Mascot FT Floor Standing Combination Boiler Domestic Hot Water 46 6 8 MFTCF199 45 47 44 41 8 6 42 7 48 B-3 7 2 10 DHW Tank _ 7 3 10 49 4 50 10 6 11 51 DHW Tank _ No. 43 3 52 6 No.
LAARS Heating Systems Page 84 Blower MFTCF140 1-Jul-15 9 13 14 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 10 No. 11 1 87 15 88 15-1 89 15-2 89-1 16 89-2 16-1 89-3 16-2 89-4 16-3 89-5 16-4 90 16-5 91 16-6 92 16-7 92 17 93 18 94 19 94-1 20 94-2 21 94-3 22 94-4 23 95 96 24 25 26 27 1" PACKING Clip for Cold water inlet 1 Clip for Cold water inlet 2 DHW Tank Temp.
Page 85 Mascot FT Floor Standing Combination Boiler Blower MFTCF199 85 81 82 86 88 N-2 B-22 87 83 84 9 89 79 80 90 91 92 9 93 89-3 89-3 B-9 Fan & Gas Valve _ No. 89 B-9 89-5 89-4 89-2 B-4 89-1 Fan & Gas Valve _ No.
LAARS Heating Systems Notes: H2373000A 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, USA 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.