Laars MSTWW199 Operation Instructions Manual Download Page 64

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LAARS Heating Systems

Mascot ST Tankless Water Heater

H2372600E

Customer Service and Product Support:

800.900.9276 • Fax 800.559.1583

Headquarters:

Industrial Way, Rochester, NH, USA 03867 • 603.335.6300 • Fax 603.335.3355

9 Brigden Gate, Halton Hills, Ontario, Canada L7G 0A3 (905) 203-0600 Fax: (905) 636-0666

www.Laars.com

Litho in U.S.A. © Laars Heating Systems 20-01 Document 1316E

Dimensions and specifications subject to change without notice in accordance with our policy of continuous product improvement.

Notes:

For LAARS Product

and Service V

IDEOS

All Manuals (Install &

Operate, Start Up, and

Service Manuals) can

be downloaded at

https://www.youtube.

com/user/LaarsHeating

www.laars.com

Summary of Contents for MSTWW199

Page 1: ...death Improper installation and or operation will void the warranty AVERTISSEMENT Assurez vous de bien suivres les instructions donn es dans cette notice pour r duire au minimum le risque d incendie...

Page 2: ...T DHW OP Sensor detects 51 6 2 3 Fan Air Proving 51 SECTION 7 Troubleshooting 7 1 Diagnostics 52 SECTION 8 Maintenance 8 1 Annual Startup and General Maintenance 55 SECTION 9 Installation Check 9 1 Q...

Page 3: ...ms or questions regarding this equipment Experience has shown that most operating problems are caused by improper installation All installations must be made in accordance with 1 American National Sta...

Page 4: ...CONFIG W Wall Hung ALTITUDE A 0 10 000 Feet REVISION 1 First OPTIONS X Standard R Recirculation PUMP X no Pump 1 M SECTION 2 Product Characteristics 2 1 Model Nomenclature The Model Nomenclature is s...

Page 5: ...on Metal Fiber Infrared Gas Valve System Air ratio valve Minimum Flow Rate 0 5 GPM Internal Pipe Material STS 304 Dimensions W17 3 H28 7 D14 8 Product Weight 88 lbs 40 kg Shipping Weight 100 lbs 45 kg...

Page 6: ...g Systems Page 6 Description Diameter A Vent Pipe Collar 3 B Air Intake Collar 3 C Gas Inlet 3 4 D DHW Outlet 3 4 E DHW Inlet 3 4 F Condensate Drain 1 2 G Cold Water Inlet Filter _ 2 3 Dimensions Air...

Page 7: ...essure Switch 14 Gas Inlet 15 Gas Inlet Pipe 16 Freeze Protector Sensor 17 Domestic Hot Water DHW Outlet 18 Condensate Trap Cleanout Name of Component 19 Cold Water Inlet 20 Cold Water Inlet Filter 21...

Page 8: ...actices and hazards involving only property damage FOR YOUR SAFETY READ BEFORE OPERATING If you do not follow these instructions exactly a fire or explosion could result causing property dam age perso...

Page 9: ...is Water Heater if any part has been under water Immediately call a qualified technician for inspecting the Water Heater and replacing any part of the control system and gas control which have been un...

Page 10: ...he heating pipes 4 Check the Gas Valve Check that the manual gas shut off valve that supplies the Mascot ST is opened 5 Check the area around the appliance and remove any combustible or flammable mate...

Page 11: ...fail due to the exposure to moisture Do not disassemble the Water Heater If repair is required call your local qualified technician After repair of gas pipeline or gas regulator replacement call a qu...

Page 12: ...he Water Heater which has gas control system components must be protected from any possible danger during operation and service If new Water Heater replaces the existing appliance check and correct sy...

Page 13: ...n drill 4 holes 0 47 dia with a 1 2 drill bit into the wall through the Bracket If mounting to a concrete wall then use the concrete anchors If onto wood or 5 8 16 mm plywood then use the wood screws...

Page 14: ...f total input rating of all equipment in the enclosure When communicating to the outdoors through horizontal ducts each opening shall have a minimum free area of not less than 1square inch per 2000 Bt...

Page 15: ...emp cher l accumulation de condensat et si n cessaire les chaudi res de cat gories II et IV doivent tre pourvues de dispositifs d vacuation du condensat The Mascot ST is standard as a Natural Gas Wat...

Page 16: ...Mascot ST changes dramatically with changes in operating water temperature Therefore it is necessary to assess the application of the water heater to determine the required certified vent class If th...

Page 17: ...eater Do not locate vent termination where exposed to prevailing winds Moisture and ice may fall on surface around vent termination To prevent deterioration surface must be in good repair sealed paint...

Page 18: ...o building or the combustion air inlet 399 850 Other than Direct vent 4 ft 1 2m below 36 inches 91 cm to any other appliance or to side of opening 1 ft 30cm above opening NT 80 only 12 inches 30 cm K...

Page 19: ...inside corner H Clearance to each side of center line extended above meter regulator assembly 36 in 91 cm within a height 15 ft 4 57 m above the meter regu lator assembly I Clearance to service regul...

Page 20: ...e wall horizontally vented gas fueled equipment is installed in a crawl space or an attic the hard wired carbon monoxide with alarm and battery back up may be installed on the next adjacent floor leve...

Page 21: ...oivent tre prises pour chaque appareil toujours raccord au syst me d vacuation commun et qui fonctionne alors que d autres appareils toujours raccord s au syst me d vacuation ne fonctionnent pas 1 Sce...

Page 22: ...er collar to the vent termination For installations in Canada field supplied plastic vent piping must comply with CAN CGA B149 1 latest edition and be certified by the Standard For Type BH Gas Venting...

Page 23: ...d and Follow Sections 4 3 Guidelines First 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...

Page 24: ...part 12 MIN Apart Exhaust 90o Elbow Exhaust Screen Exhaust Exhaust 12 MIN 1 MIN Sill Combustion Intake Combustion Intake SIDE VIEW FRONT VIEW Exterior Wall NOTE Must be 12 Minimum distance above highe...

Page 25: ...ic Vent Strap 1 25mm to 4 100mm Combustion Air Vent 12 30cm Minimum clearance above highest anticipate snow level Vent 12 Minimum clearance above highest anticipated snow level or grade whichever is g...

Page 26: ...the installation 1 Verify that the appliance is fitted for the proper type of gas by checking the rating plate Mascot ST will function properly at elevations up to 10 000 feet 3050 m Refer to Section...

Page 27: ...unit Gas line close position Gas line open position To facilitate any future maintenance it is also recommended that an approved gas union fitting be installed in the supply line between the shut off...

Page 28: ...nection 1 2 3 4 Gas pipe size Manual gas shut off valve Gas meter G Capacity not less than total capacity of connected appliances Other appliance Sediment Trap The Water Heater is be connected to the...

Page 29: ...UST CO2 AT MAX FIRE ONLY AT MIN FIRE Natural Gas LP Gas Maximum Pressure 10 5 WC Maximum Pressure 13 0 WC Minimum Pressure 3 5 WC Minimum Pressure 8 0 WC Table 10 Min and Max Inlet Gas Line Pressures...

Page 30: ...2 Turn the dial E until 9 HA appears 3 Press the dial E 4 Set the high altitude value by turning the dial Refer to table 5 Press the dial again E to save the setting 6 Press the Modes button for one s...

Page 31: ...er is defined as drinkable water supplied from a utility or from a well in compliance with EPA secondary maximum contaminant levels 40 CFR Part 143 3 as shown in Table 13 Water quality must be within...

Page 32: ...odes 3 In Massachusetts a vacuum relief valve must be installed per 248 CMR 4 In Massachusetts state plumbing code requires a distance no greater than 50 feet from the water heater to the fail coiler...

Page 33: ...r of operation please check the neutralizer every few months for depletion Apply only corrosion resistant materials for the condensate drain lines such as 1 2 PVC CPVC Polypropylene pipe or included p...

Page 34: ...he National Electrical Code NFPA 70 and or CSA C22 1 Electrical Code Part 1 in Canada ELECTRICAL SHOCK HAZARD For your safety turn off electrical power supply at service entrance panel before making a...

Page 35: ...Figure D For dual port manometers use the positive essure side Check for proper manifold gas pressure Refer to Table D You must have acceptable gas manifold essure before continuing stablish a call f...

Page 36: ...LAARS Heating Systems Page 36 4 19 Wiring Diagram...

Page 37: ...Mascot ST Tankless Water Heater Page 37 4 20 Ladder Diagram...

Page 38: ...SMW250 03 1 RS 485 RS485 SELV 5VDC 2 RS485 SELV 5VDC 3 CN4 LWD1140 06 1 FAN Not Used 2 GND SELV 30VDC 3 VDD SELV 14VDC 4 Fan power start coil SELV 30VDC 5 Fan power end coil SELV 30VDC 6 Fan speed fe...

Page 39: ...or position SELV 14VDC 7 VDD SELV 24VDC CN10 SMW250 08 1 DHM DHM Stepper motor coil Y phase SELV 14VDC 2 DHM Stepper motor coil Y phase SELV 14VDC 3 DHM Stepper motor coil X phase SELV 14VDC 4 DHM Ste...

Page 40: ...95 120 F 35 49 C DHW Set Point HIGH Range 121 140 F 49 5 60 C Only accessible from DHW Set Point LOW Range D Toggle C F E Scroll Select Turn to scroll tap to select clockwise or counterclockwise The C...

Page 41: ...WARNING Do not use this appliance if any part has been under water Immediately call a qualified service technician to inspect the appliance and to replace any part of the control system and any gas c...

Page 42: ...ll 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 Indicate Example Current DHW t...

Page 43: ...pm value C Lc Lock Mode Lock mode is used On or unused oFF d OP OP Temperature Current Operating Temperature E dH DHW temperature Current DHW temperature F Eh Exhaust Temperature Current Exhaust tempe...

Page 44: ...o 140 F 60 0 C H 140 F When changing DHW setpoint the DHW icon will flash S24 Changing between Celsius and Fahrenheit When the button D is pressed for more than 5 seconds temperature unit will toggle...

Page 45: ...utton B to get into the Installer Mode Rotate Dial E until you find the Installer Parameter that you wish to change Tap Dial E to enter that Parameter Adjust to the setting that you require and then p...

Page 46: ...7 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 i...

Page 47: ...o replace the sensor 5 If the problem persists replace the main control Soft Lock 20 High Limit Overheat Switch Closed is Normal Open is Fault Press the Power button to clear the Error Code 1 Inspect...

Page 48: ...OP Follow the instructions on page 2 this manual and call a qualified service technician or the fuel gas utility Press the Power button to clear the Error Code If Error happens again 1 Check the water...

Page 49: ...emedied If Error happens again 1 Check the water heater cover Ensure it is secure Flame detection sensor can detect an external light source 2 Check flame detection sensor Ensure connections are secur...

Page 50: ...LAARS Heating Systems Page 50 6 2 Fault Tree Analysis 6 2 1 Flame Detection 6 2 2 Gas Detection...

Page 51: ...Page 51 6 2 3 Fan Air Proving 6 2 Fault Tree Analysis continued 6 2 4 I T DHW OP Sensor detects Error code contents E31 Inlet water NTC open or short E32 DHW NTC open or short E33 OP NTC open or shor...

Page 52: ...supply and manifold gas pressures are in accordance with specifications Make sure that the water flow sensor with three wires has been properly connected on the top of heat exchanger Outlet water is...

Page 53: ...rol panel but water heater is oper ating Occurs when the communication is lost from the control to the display Check for loose connec tions and proper pin alignment engagement on the Control s plug Ch...

Page 54: ...tions and pin engagement at blower connections Water heater is in standby mode and fan is not running If FAN SPEED is not 0 RPM then replace the fan IGNITION FAULT Even if water heater went through 8...

Page 55: ...charge end of the condensate drain tubing Make sure that no flue gas is escaping from the condensate drain tubing If flue gas is continuously escaping it is a serious problem Call your qualified servi...

Page 56: ...plastic assembly 7 Replace the front cover And then reconnect the power supply to the water heater 8 Press Power button on the front panel to turn on water heater Cleaning cold water Inlet Filter Drai...

Page 57: ...nd water Visually inspect for leaks around internal water piping Also inspect external water piping circulators relief valve and fittings Immediately call a qualified service technician to repair any...

Page 58: ...eater properly mounted on the wall Is there space for a drain which is close to the Water Heater Are there any combustible materials near the Water Heater and vent pipe Is the air supply sufficient fo...

Page 59: ...s the pressure relief valve of DHW Plumbing at least 3 4 in diameter Have you installed the pressure relief valve on the hot water outlet pipe near the Water Heater Final check Burner flames The burne...

Page 60: ...mbly 100022 35 1 ST1043 Burner Head 100043 35 2 ST1044 Ignition Rod Gasket 100032 35 3 ST1045 Ignition Rod antaneous Water Heater Part Number Model begins with ST rarmi IOM Ref Laars Description 04900...

Page 61: ...Mascot ST Tankless Water Heater Page 61 Cover Assembly 21...

Page 62: ...et Pipe 013 17 2 ST1023 Water Inlet Sensor 079 17 3 ST1024 Water Inlet Filter 122 17 4 ST1025 Water Inlet Filter Cap 017 18 ST1026 Case Bracket PAIR 005 20 ST1028 Intake Inlet Duct ASS Y 025 21 FT1894...

Page 63: ...xhaust Packing 2 49100113 31 6 ST1035 Condensate Gutter 160510018 32 ST1036 Blower Assembly 42100043 32 1 ST1037 Blower 51200026 32 2 ST1038 O Ring 29100019 32 3 ST1039 AGM Actuator 850150044 33 ST104...

Page 64: ...n Hills Ontario Canada L7G 0A3 905 203 0600 Fax 905 636 0666 www Laars com Litho in U S A Laars Heating Systems 20 01 Document 1316E Dimensions and specifications subject to change without notice in a...

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