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Installation and Operation Instructions
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.
Installation and Operation
Instructions for
M
ASCOT
Wall-Mounted, Modulating
Gas Condensing Water Heater
Model MSTWW
199,000 BTU/hr
•
Natural Gas (NG) - Factory Configuration
•
Propane Gas (LP) - Field-Convertible
Assurez-vous de bien suivres les instructions
données dans cette notice pour réduire au
minimum le risque d'incendie ou d'explosion
ou pour éviter tout dommage matériel, toute
blessure ou la mort.
Ne pas entreposer ni utiliser d'essence ou ni
d'autres vapeurs ou liquides inflammables dans
le à proximité de cet appareil ou de tout autre
appareil.
QUE FAIRE SI VOUS SENTEZ UNE ODEUR DE
• Ne pas tenter d'allumer d'appareils.
• Ne touchez à aucun interrupteur. Ne pas vous servir
des téléphones dans le bâtiment où vous vous
trovez.
• Appelez immédiatement 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 l'entretien doivent être assurés par
un installateur ou un service d'entretien qualifié
ou par le fournisseur de gaz.
ST
®
AVERTISSEMENT
GAZ:
Document 1316
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Table of Contents
Summary of Contents for MASCOT MSTWW
- Page 1 Installation and Operation Instructions for ASCOT ® Wall-Mounted, Modulating Gas Condensing Water Heater Model MSTWW 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.
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Page 2: Table Of Contents
LAARS Heating Systems TABLE OF CONTENTS SECTION 1 Product Accessories 1.1 Introduction ............1 4.17 Electrical Wiring Connections ....... 34 1.1 Included with the Appliance ........1 4.18 DIP Switches ............35 4.19 Control Board, Electrical Diagram ......36 SECTION 2 4.20 Ladder Diagram ............37 4.21 Electrical Connections .......... -
Page 3: Product Accessories
Edition “National Fuel Gas Code” or 1.2 Included with the Appliance Items Descriptions LAARS Tankless Water Heater Installation and Operation Instructions Document 1316 User’s Manual User’s Manual - Mascot ST Water Heater Document 1317 Page 1 Installation and Operation User’s Manual Instructions for ASCOT ®... -
Page 4: Product Characteristics
SERIES SIZE CONFIG FUEL ALTITUDE REVISION OPTIONS PUMP MBTU/h Mascot ST A - 0-10,000 Feet W - Condensing W - Wall Hung N - Natural 1 - First X - Standard X - no Pump 1 9 9 Water... -
Page 5: Specifications
Mascot ST Tankless Water Heater Page 3 2.2 Specifications Model Name MSTWW199 199,000 Btu/h Gas Input Rate 19,900 Btu/h 35°F Rise 11.0 GPM Hot Water Capacity 45°F Rise 8.5 GPM 77°F Rise 5.0 GPM Installation Indoor Wall Hung Flue System Sealed Combustion Direct & Single Vnet Vent Run 2″(50ft) / 3″(100ft) Schedule 40 PVC, CPVC, PP, ABS... -
Page 6: Dimensions
LAARS Heating Systems Page 4 2.3 Dimensions Vent Air Intake Description Diameter Vent Pipe Collar 3" Air Intake Collar 3" Gas Inlet 3/4" DHW Outlet 3/4" DHW Inlet 3/4" Condensate Drain 1/2" Cold Water Inlet Filter... -
Page 7: Names Of Components
Mascot ST Tankless Water Heater Page 5 2.4 Names of Components Vent Combustion Name of Component Name of Component Vent Pipe Collar Cold Water Inlet Combustion Air Intake Assembly Cold Water Inlet Filter Air Gas Mixture (AGM) Actuator Manual Power Switch Ignition Transformer DHW Temperature Sensor... -
Page 8: Safety Regulations
LAARS Heating Systems Page 6 SECTION 3 Safety Regulations 3.1 Safety Symbols WARNING WARNING To avoid product damage, personal injury, or even FOR YOUR SAFETY READ BEFORE possible death, carefully read, understand, and OPERATING follow all the instructions in the Installation and Operation manual before installation, operation If you do not follow these instructions exactly, a fire and service the Water Heater. or explosion could result causing property dam- age, personal injury or loss of life. - Page 9 Mascot ST Tankless Water Heater Page 7 damaging condition that might affect the operation of the unit. Water Heater must be checked by a qualified technician before resuming operation. DO NOT use this 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 DANGER been under water.
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Page 10: Safety Precautions And Proper Use
The appliance will not open ignite when insufficient water or no water is in the heating pipes. (valve: always open position) 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 materials. Remove laundry or any other items that are on or near the water heater or exhaust vent. - Page 11 Mascot ST Tankless Water Heater Page 9 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 water heater.
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Page 12: Installation
4.1 Location and Clearances Installations must comply with • All the local, state, provincial, and national codes, laws, regulations and ordinances. The Mascot ST must be mounted to a suitable wall by • N ational Fuel Gas Code, ANSI Z224.1 – The latest a qualified heating contractor under the guidelines of a version. -
Page 13: Wall Mount Bracket
• Position the Wall Mount Bracket at the location that it will go, being sure that it is level, and then drill 4 holes (0.47”dia) with a 1/2” drill bit, into the wall through the Bracket. • I f mounting to a concrete wall, then use the concrete anchors. If onto wood or 5/8” (16 mm) plywood, then use the wood screws. Do not hang the Mascot ST onto sheetrock unless it is possible to fasten directly into the structural studs. If the included anchors do not suit your installation, you must use ‘Field Supplied’... -
Page 14: Combustion Air
Btu/hr (734 square mm/kW) of the total input rating of building codes must also be adhered to. all equipment located in the enclosure. This opening A Mascot ST unit can take combustion air from the must not be less than the sum of the areas of all vent space in which it is installed, or the combustion air connectors in the confined space. - Page 15 II et IV doivent être pourvues de dispositifs d'évacuation du CAUTION condensat. The Mascot ST is standard as a Natural Gas Water Heater and must be converted if propane is the desired gas, unless specifically manufactured for propane. Adequate drainage •...
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Page 16: Venting (Exhaust)
AVIS NE PAS ÉVENT COMMUNE MASCOTTE ST UNITÉS. DO NOT COMMON VENT MASCOT ST UNITS. Mascot ST units are never permitted to share a Mascotte ST unités ne sont jamais autorisés à partager un évent Catégorie I avec les appareils. -
Page 17: General Location Guideline
Mascot ST Tankless Water Heater Page 15 WARNING through an outside wall. F ailure to vent this Water Heater in accordance Vent pipe must pitch upward, toward the vent with these instructions could cause a fire, terminal, not less than 1/4” per foot, so that resulting in severe property damage, personal condensate will run back to the Mascot ST to drain. injury or death. Route vent pipe to the heater as directly as possible. D o not interchange vent systems or materials Seal all joints and provide adequate hangers as unless it is specified. required in the venting system manufacturer’s T he use of thermal insulation covering pipe and Installation Instructions. Horizontal portions of... -
Page 18: Direct Venting Clearances
LAARS Heating Systems Page 16 4.6 Locations for Vent Pipe Terminator * F or 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. 4.6.1 Direct Venting Clearances US Direct Vent Instal- Canadian Direct Vent Description lations Installations... -
Page 19: Non-Direct Venting Clearances
Mascot ST Tankless Water Heater Page 17 4.6.2 Non-Direct Venting (Single Pipe) Clearances Description US Non-Direct Canadian Non-Direct Clearance above grade, veranda, porch, deck, or balcony 12 in (30 cm) 12 in (30 cm) 48 in (120 cm) below or to side of opening;... -
Page 20: Venting Requirements In Massachusetts
LAARS Heating Systems Page 18 4.6.3 Venting 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 Signage. A metal or plastic identification plate Installation of Carbon Monoxide Detectors shall be permanently mounted to the exterior of... -
Page 21: Common Vent Test
NE PAS ÉVENT COMMUNE MASCOTTE ST UNITÉS. DO NOT COMMON VENT MASCOT ST UNITS. Mascotte ST unités ne sont jamais autorisés à Mascot ST units are never permitted to share a partager un évent Catégorie I avec les appareils. vent with Category I appliances. -
Page 22: Air / Vent Connections At The Appliance
LAARS Heating Systems Page 20 4.7 Air Supply and Vent Connections at the Appliance 4.7.1 Vent / Air Pipe Lengths 3˝ Combustion Air / Vent Pipe 2˝ Combustion Air / Vent Pipe Water Heater model Elbow Max Elbow Max MSTWW199 100´ (30M) 50´ (15M) Table 6. Maximum Vent / Air Pipe Lengths for either 3” or 2 “ Pipes Note : For additional elbows, reduce maximum allowable length •... -
Page 23: Indoor Combustion Air
Mascot ST Tankless Water Heater Page 21 4.7.3 Single Venting Read 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 54 or CAN/CGA B-149.1: Model MSTWW199 Maximum Input 199,000 (BTU/H) Indoor make up air is 199 in 2 provided, a minimum free 14 1/4" area of 1 in 2 per... - Page 24 LAARS Heating Systems Page 22 4.8 Vent Pipe Termination (cont) Horizontal Vent Termination (cont) • Direct Vent - Optional Sidewall Snorkel Terminations Vertical Vent Termination • Direct Vent - Vertical Terminations with Sloped Roof Concentric Vent Termination • Direct Vent - Optional Horizontal and Vertical Concentric Vent Side wall Vent (2"or 3")
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Page 25: Gas Supply And Piping
Open flame can cause gas to ignite and result in floor stands, not the appliance. property damage, severe injury, or loss of life. Review the following instructions before proceeding with the installation. NOTE: The Mascot ST appliance and all other gas 1. V erify that the appliance is fitted for the proper type appliances sharing the gas supply line must be firing at of gas by checking the rating plate. Mascot ST will maximum capacity to properly measure the inlet supply function properly at elevations up to 10,000 feet pressure. The pressure can be measured at the supply... - Page 26 LAARS Heating Systems Page 24 The gas connection fitting on the unit is 3/4˝ female be installed in the supply line between the shut-off NPT. valve and the 3/4˝ female NPT connection on the Water Heater. The supply line must be sized for the maximum Install an approved gas line pipe to gas output of the water heater model being installed. If line connection under the Water Heater. there are additional gas appliances from the main Include manual shut off valve and gas union supply line, you must measure sizes of the supply connection, as shown.
- Page 27 Mascot ST Tankless Water Heater Page 25 4.9 Gas Supply and Piping (continued) Water Heater MUST be installed downstream of the gas meter for adequate gas supply. Natural Gas piping installation. The Water Heater is recommended to be the first appliance to be connected to the gas supply line. Union Other appliance Connection Manual gas shut off valve 1/2"~3/4"...
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Page 28: Gas Supply Pressure
MSTWW199 2" or 3" VENT 2" or 3" VENT Display back ON to continue with CO 2 measurements. Once the CO 2 and manifold pressure CO 2 values on the Mascot ST, please refer to MSTWW199 2" or 3" VENT 2" or 3" VENT 10.7 measurements for both MIN and MAX Fire are Step 19 thru Step 24 in Section 4.13 of this... -
Page 29: Gas High Altitude Setting
0 ~ 1,999 ft (0 609 m) 0 - 2 5. For the Step by step process to measure 2,000 ~ 4,999 ft (610 1,523 m) CO2 values on the Mascot ST, please refer 5,000 ~ 7,999 ft (1,524 2,438 m) to Step 16 thru Step 24 in Section 4.13 of 8,000 ~ 10,000 ft (2,439 3,048 m) this Installation Manual. -
Page 30: Natural Gas To Propane Conversion
Representative. The ON / OFF button is located at the bottom left of the Control Display. WARNING Turn OFF the GAS and WATER supply to the Mascot ST This conversion kit must be installed by a qualifi ed service (valves are located on the plumbing pipes.) agency in accordance with the manufacturer’s instructions Using a Phillips screwdriver, remove the 4 screws on the and all applicable codes and requirements of the authority having jurisdiction. You must follow these instructions... - Page 31 Mascot ST Tankless Water Heater Page 29 Document 4286 ascot ST Gas Conversion Kit Combustion Air Gas Air Intake Mixture Assembly Chamber Gas Inlet Pipe Actuator valve Ignition Transformer Gas Pipe (supply) Figure A Figure B Blower IMPORTANT! Orifi ce Be sure to place an orientation...
- Page 32 ON to continue with CO 2 measurements. Turn ON the GAS and WATER supply to the Mascot ST. NOTE: If your Mascot ST is installed at an altitude greater than 2,000 ft, then the correct altitude setting should have been set previously and saved within the Control Display. If this has not been done, then Refer to Section 4.12 of the Mascot ST Install and Operating Manual (document #1316) before continuing with this Gas Conversion. 5 to OFF Per Table B, set DIP Switch for LP Propane .
- Page 33 Mascot ST Tankless Water Heater Page 31 Document 4286 ascot ST Gas Conversion Kit WARNING Always make sure that the Control Display is turned High Altitude CO 2 CO 2 ‘LP’ ‘NG’ OFF before changing any DIP switch. Then turn Control Setting level Values Values Display back ON to continue with CO 2 measurements.
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Page 34: Plumbing Guideline
LAARS Heating Systems Page 32 4.14 Plumbing Guidelines. - E nsure pipe material is suitable for the local codes and industry standards. - The pipe must be cleaned and without any debris. - D o not apply torch heat within 12˝ of the bottom connections of the unit. - T he pipe size used for supply heating water should be the same size used for the return heating water. - The size of the hot water pipe should be 3/4˝ diameter. - Isolation valves(Shutoff valve) will be used. - All piping should be insulated. Applicable Backflow Preventer - A pply a backflow preventer valve in the make-up water supply (water Inlet) to the unit as required by local codes. Isolation valve Backflow preventer Pressure relief valve Ball valve 3/4" PIPE (GAS INLET ) 3/4"... -
Page 35: Disposal Of Condensate
Mascot ST Tankless Water Heater Page 33 4.15 Disposal of Condensate H igh efficiency gas condensing Water Heaters 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 drain (optional kit * ) 3. -
Page 36: Pressure Relief Valve
LAARS Heating Systems Page 34 4.16 Pressure Relief Valve WARNING An approved ‘Pressure Relief Valve’ must be included in this installation. The Valve must be an approved ASME HV Relief Valve, installed on the DHW supply line for domestic hot water loop as close to the unit as possible. (Valve size 3/4˝, maximum 150psi). 4.17 Electrical Wiring Connections WARNING Install wiring and electrically ground Water Heater in accordance with authority having jurisdiction or in the absence of such Do not disconnect the power supply when the... -
Page 37: Dip Switches
Control Display is turned OFF changing any DIP switch. Then turn Control Display N to continue with CO 2 measurements. rn ON the GAS and WATER supply to the Mascot ST. f your Mascot ST is installed at an altitude greater than 2,000 ft, then the correct altitude setting should have been set previously and saved within the Control Display. If this has not been done, then Refer to Section 4.12 of the Mascot ST Install and Operating Manual (document #1316) before continuing with this Gas Conversion. Maximum flame detecting voltage 2.4V... -
Page 38: Control Board, Electrical Diagram
LAARS Heating Systems Page 36 4.19 Wiring Diagram Figure 3. Wiring Diagram... -
Page 39: Ladder Diagram
Mascot ST Tankless Water Heater Page 37 4.20 Ladder Diagram Figure 4. Ladder Diagram... -
Page 40: Electrical Connections
LAARS Heating Systems Page 38 4.21 Electrical Connections Connector Descriptions HT SELV #, Location, Type Label CASE GROUND Power Supply Line HT (120VAC) Not Used HT (120VAC) Igniter HT (120VAC) L(HT) Heater HT (120VAC) 65001WS-12 Gas Valve HT (120VAC) EARTH GROUND HT (120VAC) Power Supply Neutral HT (120VAC) 9-12 AC Power COM Line... - Page 41 Mascot ST Tankless Water Heater Page 39 Connector Description HT SELV #, Location, Type Label Flame Detect Sensor SELV (5VDC) OP.S Operation water temperature sensor SELV (5VDC) DH.S DHW temperature sensor SELV (5VDC) Inlet water temperature sensor SELV (5VDC) LWD1140-14 BG.S Exhaust temperature sensor SELV (5VDC) ST.S Not Used SP.S...
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Page 42: Control Display And Operation
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 ST and to change temperature set points, set system variables and controller parameters. Functionality Buttons PRESS (Tap) PRESS and HOLD (5 seconds) ON / OFF... -
Page 43: Lcd Overview
Mascot ST Tankless Water Heater Page 41 SECTION 5. Control Display and Operation 5.2 LCD Overview Lock Communicating Status and Installer Modes Flame Signal Numeric Display Domestic Hot Water Mode Lock mode Buttons-locked mode icon Communication Communication icon Status and Installer mode... -
Page 44: Operating Mode
LAARS Heating Systems Page 42 5.3 Operating Mode SECTION 5. Control Display and Operation 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. Indicate Example Current DHW temperature 125°F If the flow is present If flame detected... -
Page 45: Status Display Mode
Mascot ST Tankless Water Heater Page 43 SECTION 5. Control Display and Operation 5.4 Status Display Mode Index Parameter Description A: Li or A: GA Flow 1 Current flow value(Li: L/m, GA: GPM) b: Fr Fan rpm Current fan rpm value C: Lc Lock Mode... -
Page 46: Dhw Set Point Change Mode
LAARS Heating Systems Page 44 SECTION 5. Control Display and Operation 5.5 DHW Set Point Change Mode The Mascot ST has a built in INLET DHW Flow Limiter and will automatically adjust the DHW flow rate up or down based on DHW outlet temperature at the inlet side of the water heater. If the temperature drops below the DHW setpoint, and the Mascot ST is at full fire, the inlet flow to the heat exchanger will be reduced. Therefore, the... -
Page 47: Installer Mode
Mascot ST Tankless Water Heater Page 45 SECTION 5. Control Display and Operation 5.6 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 OFF, Press and HOLD (5 seconds) the Button 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 press (tap) Dial E to save and to Exit. Finish by pressing button B... -
Page 48: Error Mode
LAARS Heating Systems Page 46 SECTION 5. Control Display and Operation 5.7 Error Mode Flashing Indicate Example Error ‘ Er : ’ will flash Er:11 Error Code Er:11 Display and Controller are communicating NOTE: W hen communication between the Control Display and the main controller is lost, the will not be displayed. -
Page 49: Error Codes
Mascot ST Tankless Water Heater Page 47 Section 6, Error Codes 6.1 Error Codes Error Recover Error Code Description Possible Remedies Code methods Press the Power button to clear the Error Code. If Error happens again: 1. Monitor the gas pressure to the water heater while in operation. Ensure pressure is between 3.5 and 14” WC. - Page 50 LAARS Heating Systems Page 48 Error Recover Error Code Description Possible Remedies Code methods This Error Code will go away when outlet water temperature decreases. Operating If Error happens again: Temperature Sensor 1. Check operating temperature sensor. Ensure connections are secure. Soft Lock Open or Short 2.
- Page 51 Mascot ST Tankless Water Heater Page 49 Error Recover Error Code Description Possible Remedies Code methods Press the Power button to clear the Error Code. If Error happens again: Supply Water Valve 1. Turn power OFF and ON at the main power switch internal to the water heater.
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Page 52: Fault Tree Analysis
LAARS Heating Systems Page 50 Section 6, Error Codes 6.2 Fault Tree Analysis 1. Flame Detection 2. Gas Detection... - Page 53 Mascot ST Tankless Water Heater Page 51 Section 6, Error Codes 6.2 Fault Tree Analysis 3. Fan / Air Proving 4. ‘I/T’, ‘DHW’, ‘OP’ Sensor detects Error code contents Inlet water NTC open or short DHW NTC open or short OP NTC open or short...
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Page 54: Diagnostics
LAARS Heating Systems Page 52 Section 7 – Troubleshooting 7.1 Diagnostics Before calling for service, review the following diagnostic steps first for saving time and money. Question & Answer Indicate Indicator 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 fuses on the main controller in the units are good. -
Page 55: Failure Modes
Mascot ST Tankless Water Heater Page 53 Section 7 – Troubleshooting 7.1 Diagnostics Diagnostics and suggested corrective actions This controller is able to record information about the water heater’s condition for the ten previous faults or errors. Refer to the ‘Error Code’ section of this Manual, (Section 6). - Page 56 LAARS Heating Systems Page 54 Section 7 – Troubleshooting 7.1 Diagnostics Display Condition Diagnostic Corrective Action(s) Burner may be operating too hot due to incorrect combustion. Occurs when flame Reset using manual switch. Reset screen on control Check for flame at burner via flame current with FLAME FAULT detected when there panel.
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Page 57: Section 8
Mascot ST Tankless Water Heater Page 55 Section 8 – Maintenance 8.1 Annual Startup and General Maintenance Regular Maintenance Maintenance procedures [ Periodically ] After Water Heater installation is completed, this manual should be placed in safe dry location near - Check power source. the water heater. Maintenance instructions should be Make sure that the power cord is correctly connected. carried out by these guidelines annually by a qualified The main power line is connected to the manual technician. -
Page 58: Annual Startup And General Maintenance
LAARS Heating Systems Page 56 Section 8 – Maintenance 8.1 Annual Startup and General Maintenance - Cleaning Air Intake Filter - T o properly maintain the water heater, you should clean the air intake filter every 3 months. If not, you may encounter combustion issues To clean air intake filter: 1. Press Power button on the control panel to turn off the water heater. 2. Disconnect power supply to water heater. 3. Remove front cover of water heater. 4. Pull the filter out of air intake adapter. 5. Remove the filter from the plastic assembly and clean it with a toothbrush and clean running water. 6. Dry the filter completely. And then reinsert the filter into the 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 (Draining the Water Heater) 1. Place a bucket under the appliance to collect the residual water inside the water heater. 2. P ress Power button on the front control panel to turn off the electrical power to the water heater. And then turn off the gas valve. - Page 59 Mascot ST Tankless Water Heater Page 57 Section 8 – Maintenance 8.1 Annual Startup and General Maintenance - Flushing the Water Heater 8. Disconnect all hoses. 9. R emove the cold water inlet filter from the water heater Flushing the Heat Exchanger of water heater is a and clean out any residues. complicated procedure and should only be done by 10. R einsert the filter and ensure the filter cap is securely...
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Page 60: Installation Check
LAARS Heating Systems Page 58 Section 9 – Installation Check 9.1 Quick View 9.2 Final check lists Before Installing Final check : Installation Conditions. - Make sure that there is enough space for installing • Is the Water Heater properly mounted on the wall? Water and gas line. • Is there space for a drain which is close to the Verify vent/air termination is located as required. - Page 61 Mascot ST Tankless Water Heater Page 59 Final check : Connecting the power supply • Please check that the power is 120V AC. • Have you checked the polarity of the electrical connection? Final check : Pressure relief valve • Have you installed an approved pressure relief valve on the water heater? • Is the pressure relief valve of DHW Plumbing at least 3/4˝ in diameter?
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Page 62: Section 10
LAARS Heating Systems Page 60 Section 10 – Repair Part Diagram 10.1 Parts List Part list Instantaneous Water Heater Part Number - Model begins with "ST" Kiterarmi # IOM Ref Laars # Description H120490006 ST1001 Exhaust ASS'Y H110240306 ST1002 Case Cover Assembly H110130108 ST1003 Door ASS'Y... - Page 63 Mascot ST Tankless Water Heater Page 61 Cover Assembly...
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Page 64: Part List
17-1 ST1022 Water Inlet Pipe 17-2 ST1023 Water Inlet Sensor LAARS Heating Systems Page 62 17-3 ST1024 Water Inlet Filter 17-4 ST1025 Water Inlet Filter Cap ST1026 Case Bracket (Left) ST1027 Case Bracket (Right) Part list ST1028 Intake Air ASS'Y ST1029 Heat Exchanger Assembly 31-1... - Page 65 870060043 ST1007 Gas Inlet Nipple 11400020 ST1008 Overheat Sensor Mascot ST Tankless Water Heater Page 63 160420004 ST1009 DHW Supply Pipe ASS'Y 49100124 ST1010 DHW Supply Pipe 11300015 ST1011 Water Outlet Sensor 160522003 ST1012 Siphon ASS'Y ST1013 Siphon Air Pressure Hose...
- Page 66 LAARS Heating Systems Page 64 Notes:...
- Page 67 Mascot ST Tankless Water Heater Page 65 Notes:...
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Page 68: Notes
LAARS Heating Systems Notes: Dimensions and specifications subject to change without notice in accordance with our policy of continuous product improvement. 800.900.9276 • Fax 800.559.1583 Customer Service and Product Support: Industrial Way, Rochester, NH 03867 • 603.335.6300 • Fax 603.335.3355 Headquarters: 1869 Sismet Road, Mississauga, Ontario, Canada L4W 1W8 • 905.238.0100 • Fax 905.366.0130 www.Laars.com...
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