American Standard TCWH-199-AS Installation Start-Up Maintenance Parts
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American Standard TCWH-199-AS Installation Start-Up Maintenance Parts

Tankless condensing water heater
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NOTICE: American Standard reserves the right to make product changes or updates without notice and will not be held liable for typographical errors in literature
NOTE TO CONSUMER: PLEASE KEEP ALL INSTRUCTIONS FOR FUTURE REFERENCE.
The surfaces of these products contacted by consumable water contain less than 0.25% lead by weight, as required by the Safe Drinking Water Act, Section 1417
WARNING
WHAT TO DO IF YOU SMELL GAS
Do not try to light any water heater.
Do not touch any electrical switch.
Do not use any phone in your building.
Immediately call your gas supplier from a neighbor's phone. Follow the gas supplier's instructions.
If you cannot reach your gas supplier, call the fire department. Installation and service must be provided by a qualified installer, service agency, or the gas supplier.
3515 Lakeshore Drive, Saint Joseph, MI 49085
IF THE INFORMATION IN THIS MANUAL IS NOT FOLLOWED EXACTLY, A FIRE OR EXPLOSION MAY RESULT, CAUS-
ING PROPERTY DAMAGE, PERSONAL INJURY OR DEATH. DO NOT STORE GASOLINE OR OTHER FLAMMABLE
VAPORS AND LIQUIDS IN THE VICINITY OF THIS OR ANY OTHER WATER HEATER.
TANKLESS CONDENSING
WATER HEATER
INSTALLATION
MAINTENANCE
www.americanstandardwaterheaters.com
START -UP
PARTS
APPLICABLE MODEL:
TCWH-199-AS
TCWH-180-AS

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Summary of Contents for American Standard TCWH-199-AS

  • Page 1 TCWH-199-AS TCWH-180-AS NOTICE: American Standard reserves the right to make product changes or updates without notice and will not be held liable for typographical errors in literature NOTE TO CONSUMER: PLEASE KEEP ALL INSTRUCTIONS FOR FUTURE REFERENCE. The surfaces of these products contacted by consumable water contain less than 0.25% lead by weight, as required by the Safe Drinking Water Act, Section 1417 IF THE INFORMATION IN THIS MANUAL IS NOT FOLLOWED EXACTLY, A FIRE OR EXPLOSION MAY RESULT, CAUS- ING PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
  • Page 2 TANKLESS WATER HEATER FOR YOUR SAFETY READ BEFORE LIGHTING If you do not follow these instructions exactly, a fire or explosion may result causing WARNING property damage, personal injury or loss of life. A. This appliance does not have a pilot. It is equipped with an ignition device which automatically lights the burner. Do not try to light the burner by hand.
  • Page 3 SPECIAL ATTENTION BOXES The following defined terms are used throughout this manual to bring attention to the presence of hazards of various risk levels, or to important product information. Indicates an imminently hazardous situation, which, if not avoided, will result in DANGER death or serious injury.
  • Page 4 AHJ. NOTE: American Standard, Inc. reserves the right to modify product technical specifications and components with out prior notice. FOR THE INSTALLER This manual must only be used by a qualified heating installer/service technician.

  • Page 5: Table Of Contents

    CONTENTS Part 1 Items shipped with the water heater Part 2 Safety regulations A. Operation and installation warnings B. Improper combustion C. Gas D. When servicing the water heater E. Water quality F. Freeze protection Part 3 Technical specifications Part 4 Prepare water heater location A.
  • Page 6 TANKLESS WATER HEATER Part 6 Install the condensate drain Part 7 Gas piping A. Gas pipe sizing tables 1. Gas Pipe Sizing 2. Natural Gas Pipe Sizing 3. LP (Liquid Propane) Gas Pipe Sizing B. Gas connection requirements C. Adjusting gas pressure at the water heater D.
  • Page 7 3. Air pressure switch 4. Inlet / DHW / Operating Temperature SENSORS Part 11 Final installation checklist Part 12 Troubleshooting Part 13 Maintenance procedures Replacement parts Maintenance report Maintenance notes American Standard Water Heaters Customer installation record form on page 79.

  • Page 8: Part 1 Items Shipped With The Water Heater

    TANKLESS WATER HEATER PART 1 Items shipped with the water heater ITEM DESCRIPTION QUANTITY Tankless Water Heater Quick Reference Guide, User, and Instal- 1 Each lation Manuals Condensate Hose (50315240703) Anchors and Wall Mounting Bracket (50315240723) Spare Parts Kit (Gas- kets and O-Rings) (50315240693) Vent Screens (3”)

  • Page 9: Part 2 Safety Regulations

    American Standard Water Heaters cannot anticipate every circumstance that might involve a potential haz- ard. Each installation has its own specialized characteristics, requirements, and possible hazards. Therefore, all possible incidents are not included in these warnings.
  • Page 10 Certain local codes require additional temperature limits. In addition, certain types of systems may operate at temperatures below the minimum set point of the limit provided with the water heater. Contact American Standard Water Heaters for additional overheat controls.

  • Page 11: Improper Combustion

    Table 2 – Water Quality Specifications F. FREEZE PROTECTION Consider water heater piping and installation when determining CAUTION water heater location. NOTE: Damages resulting from incorrect installation or from use of products not approved by American Standard Water Heaters ARE NOT covered by warranty.

  • Page 12: Part 3 Technical Specifications

    TANKLESS WATER HEATER PART 3 Technical Specifications MODEL TCWH180S-AS TCWH199S-AS Installation Indoor, Wall Hung, Fully Condensing Indoor, Wall Hung, Fully Condensing Minimum / Maximum Input (Btu/Hr) 18,000 / 180,000 19,900 / 199,000 °F Rise 9.8 Gal 11.0 Gal °F Rise 7.6 Gal 8.5 Gal Hot Water Capacity (GPM)
  • Page 13 Figure 1 – Specifications and Dimensions Description Diameter Exhaust Outlet Pipe 3” Air Intake 3” Gas Inlet 3/4” DHW Outlet Adapter 3/4” DHW Inlet Adapter 3/4” Condensate Adapter 1/2” DHW Inlet Filter Table 4 – Adapter Specifications...
  • Page 14 TANKLESS WATER HEATER Figure 2 – Components NUMBER COMPONENT DESCRIPTION NUMBER COMPONENT DESCRIPTION Exhaust Vent Adapter Exhaust Duct Air Inlet Piper Gas Valve AGM (Air Gas Mixer) Gas Inlet Pipe 2 Ignition Transfomer BLDC Fan Igniter Air Intake Pipe Adapter Flame Detection Sensor Gas Inlet Adapter Primary Heat Exchanger Assembly...

  • Page 15: Part 4 Prepare Water Heater Location

    PART 4 Prepare water heater location Carefully consider installation when determining water heater location. Please read the entire manual before attempting installation. Failure to properly take factors such as water heater venting, piping, condensate removal, and wiring into CAUTION account before installation could result in wasted time, money, and possible prop- erty damage and personal injury.
  • Page 16 The water heater should be located near a floor drain, or installed in proximity to an adequately emptied drain pan. American Standard WILL NOT held liable for leakage damages.

  • Page 17: Leveling

    B. LEVELING The water heater must be installed level in order for the condensate to proper- CAUTION ly flow out of the collection system. C. CLEARANCES FOR SERVICE ACCESS See Table 6 for recommended service clearances. If these minimum clearances are not provided, it may not be possible to service the water heater without removing it from its’...

  • Page 18: Prevent Combustion Air Contamination

    TANKLESS WATER HEATER You must also install air intake piping from outdoors to the water heater flue adaptor. The resultant installation is categorized as direct vent (sealed combustion). NOTE: To prevent combustion air contamination, see Table 7 in this section when considering exhaust vent and intake pipe termination.

  • Page 19: Uncrating The Water Heater

    1. Seal any unused openings in the common venting system. WARNING Figure 3 - CO Warning Label 2. Visually inspect the venting system for Breathing Hazard - Carbon Monoxide Gas proper size and horizontal pitch to determine if there is blockage, leakage, corrosion or Do not operate water heater if the unit has been subjected to flood damage.

  • Page 20: Wall-Mounting The Water Heater

    TANKLESS WATER HEATER I. WALL-MOUNTING THE WATER HEATER The water heater must be installed on a wall that can bear its weight (more WARNING than 88 lbs. when fully plumbed and full of water). Installing the water heater on a wall that cannot support its weight could result in property damage, personal injury, or death.

  • Page 21: Part 5 Venting

    PART 5 Venting Vent this water heater in accordance with these instructions. Failure to do so will DANGER result in property damage, severe personal injury, or death. DO NOT mix vent systems or materials unless specifically told to do so in this manual.
  • Page 22 TANKLESS WATER HEATER 5. Do not install venting system components on Breathing Hazard - Carbon Monoxide Gas the exterior of the building except as specifically required by these instructions. Do not operate water heater if the unit has been subjected to flood damage. •...
  • Page 23 • In vacant chimney applications, install and seal a rain cap over existing chimney openings. • All piping must be fully supported. Use pipe hangers at a minimum of 4 foot intervals to prevent sagging of the pipe where condensation may form. •...

  • Page 24: Approved Vent Materials

    TANKLESS WATER HEATER B. APPROVED VENT MATERIALS NOTICE Consult Table 9 or the most recent edition of ANSI Z223.1/NFPA 54 or CAN/CGA B149.1 as well as all applicable local codes and regulations when selecting vent pipe materials. Approved Exhaust Vent and Intake Pipe Material Standards for Installation Item Material...

  • Page 25: Allowed Schedule 40 Combined Vent Lengths (Pvc, Cpvc, Pp)

    C. ALLOWED SCHEDULE 40 COMBINED VENT LENGTHS (PVC, CPVC, PP) MODEL 2” COMBUSTION AIR/ VENT PIPE 3” COMBUSTION AIR/VENT PIPE TCWH 180-AS / 100’ (30 M) 50’ (15.24 M) TCWH 199-AS Table 10 – Approved Combined Vent Lengths NOTE: When using more than 1 elbow, reduce maximum allowable length: •...

  • Page 26: Vent Termination

    TANKLESS WATER HEATER E. VENT TERMINATION 1. Two Pipe Roof and Sidewall Vent Terminations TWO PIPE ROOF VENTING WITH TEE (INTAKE) TWO PIPE SIDEWALL VENTING WITH TEE (INTAKE) AND COUPLING (EXHAUST) AND COUPLING (EXHAUST) INSERT INLET/EXAHUST INSERT INLET/EXAHUST SCREENS INTO SCREEN INTO EACH END OF TEE STRAIGHT COUPLING...

  • Page 27: Direct Vent, Optional Horizontal And Vertical Vent Kits

    2. Direct Vent, Optional Horizontal and Vertical Vent Kits. Figure 9 – Direct Vent, Vent Terminations (With Optional Kits) All vent pipes must be glued, properly supported, and the exhaust must be WARNING pitched a minimum of ¼” per foot back to the appliance to allow drainage of condensate.

  • Page 28: Indoor Combustion Air Installation In Confined Or Unconfined Space

    TANKLESS WATER HEATER Figure 10 - Screen Installation NOTE: Vent termination elbow is meant to be installed open end facing the ground. Orientation in Figure 10 is meant to demonstrate proper Vent Screen installation ONLY. SAFETY INSTRUCTIONS 4. INDOOR COMBUSTION AIR INSTALLATION IN CONFINED OR UNCONFINED SPACE This tankless condensing water heater requires fresh, uncontaminated air for safe operation and must be installed in a mechanical room where there is adequate combustion and ventilating air.
  • Page 29 Breathing Hazard - Carbon Monoxide Gas Do not operate water heater if the unit has been subjected to flood damage. Install vent system in accordance with local codes and manufacturers installation instructions. Do not place chemical vapor emitting products near unit. According to NFPA 720, carbon monoxide detec- tors should be installed outside each sleeping area.
  • Page 30 TANKLESS WATER HEATER OUTDOOR COMBUSTION AIR EXAHUST VENT (SINGLE PIPE) UPPER AIR DUCT BOILER HEATER LOWER AIR DUCT Figure 12 NOTE: These drawings are meant to demonstrate system venting only. The installer is responsible for all equipment and detailing required by local codes.

  • Page 31: Part 6 Install The Condensate Drain

    PART 6 Install the condensate drain 1. Due to its efficient design, the water heater produces condensation (water) as a normal by-product. This condensation is acidic, with a pH level between 3 and 4. This condensation must be drained away from the water heater and disposed in accordance with all local regulations.

  • Page 32: Part 7 Gas Piping

    TANKLESS WATER HEATER PART 7 Gas Piping FIRE AND/OR EXPLOSION HAZARD WARNING To avoid serious injury or death, the gas line installation and the gas line inlet pressure test must be done by a licensed professional. Always match the water heater with the type of gas supplied to the unit (natural gas or LP gas).

  • Page 33: Lp (Liquid Propane) Gas Pipe Sizing

    Maximum Natural Gas Delivery Capacity - Length of Corrugated Stainless Steel Pipe in Feet Pipe Cubic Feet per Hour (0.60 Specific Gravity, 0.5 WC Pressure Drop) Size 1/2” 3/4” 1” 1/4” 1390 2090 1430 1150 1/2” 2” 4020 2760 2220 1900 1680 1520...
  • Page 34 TANKLESS WATER HEATER 3. Measure the length of the gas supply line from the gas meter to the water heater. Water heater must be installed downstream of the gas meter to ensure adequate gas supply. Use the tables in this manual or refer to the gas line manufacturer’s sizing information to determine the correct supply pipe size.
  • Page 35 Figure 15 – Natural Gas Piping Installation NOTE: Capacity to be not Less than Total Capacity of Connected Appliances Figure 16 – LP Gas Piping Installation NOTE: Capacity to be Not Less than Total Capacity of Connected Appliances...

  • Page 36: Adjusting Gas Pressure At The Water Heater

    TANKLESS WATER HEATER C. ADJUSTING GAS PRESSURE AT THE WATER HEATER NOTE: Refer Figure 18 when adjusting gas pressure. Loosen the bolts before checking the gas inlet pressure. 1. The water heater and its individual shutoff valve must be disconnected from the gas supply piping sys- tem during any pressure testing of the system at test pressures greater than ½...
  • Page 37 It is required to use a combustion analyzer to verify final adjustment according to WARNING the combustion chart (Table 16). Failure to do so could result in serious personal injury or death. If the readings obtained are lower or higher than the combustion readings in Table 17, use a T40 Torx key to adjust the offset screw in a clockwise (positive) or counterclockwise (negative) direction (approximately 1/4 turn).

  • Page 38: Part 8 Water Piping

    TANKLESS WATER HEATER PART 8 Water Piping A. GENERAL PLUMBING CONNECTION GUIDELINES • Pipe material must be suitable to meet local codes and industry standards. • The pipe must be cleaned and without blemish before any connections are made. • Do not apply a torch within 12”...

  • Page 39: Piping The Water Heater

    C. PIPING THE WATER HEATER Use at least the MINIMUM pipe size for all water heater loop piping. This is CAUTION to avoid the possibility of inadequate flow through the water heater. Using less than the required minimum pipe size and piping could result in system problems, property damage, and premature water heater failure.
  • Page 40 TANKLESS WATER HEATER Figure 20 – DHW Piping, Single Water Heater Figure 21 – Piping with Recirculation NOTE: These drawings are meant to show system piping concept only. Installer is responsible for all equipment and detailing required by local codes.
  • Page 41 Figure 22 – Water Heater with Storage Tank Figure 23 – Water Heater with Storage Tank and Recirculation NOTE: These drawings are meant to show system piping concept only. Installer is responsible for all equipment and detailing required by local codes.

  • Page 42: Pressure Relief Valve

    TANKLESS WATER HEATER Figure 24 – Pressure Drop through the Heat Exchanger E. PRESSURE RELIEF VALVE An external pressure relief valve must be installed on this water heater. When installing, observe the following guidelines. Failure to comply with these guidelines can result in substantial property damage, personal injury, or death.
  • Page 43 After installing the relief valve and filling and pressurizing the system, test the operation of the valve by lifting the lever. Make sure the valve discharges freely. If the valve fails to operate correctly, replace it with a new relief valve. Ensure that the maximum BTU/H rating on the pressure relief valve is equal to or greater than the maximum input BTU/H rating of the combination water heater.

  • Page 44: Part 9 Connect Electrical Power / Initial Startup

    TANKLESS WATER HEATER PART 9 Connect electrical power / Initial startup Install wiring and electrically ground water heater in accordance with the authority having jurisdiction or, in the absence of such an authority, follow the WARNING National Electrical Code, NFPA 70, and/or CSA C22.1 Electrical Code-Part 1 in Canada.

  • Page 45: Dip Switches

    NOTICE If the water heater display does not come ON, first check the plug. Also check the electrical panel circuit breaker and reset it if necessary. If the circuit breaker trips again, do not reset. Disconnect the plug and have a qualified technician diagnose the problem.
  • Page 46 TANKLESS WATER HEATER Figure 28 – Electrical Wiring Diagram...
  • Page 47 Figure 29 - Ladder Dtagram...
  • Page 48 TANKLESS WATER HEATER CONNECTOR DESCRIPTION HT SELV NO. OF LOCATION BOARD SILK UNUSED Power Supply Line UNUSED Ignitor 65001WS-12 L(HT) Ceramic Heater (Freeze Protection) HT (120V~) Gas Valve EARTH GROUND Power Supply Neutral 9-12 AC Power COM Line RS485 + RS-485 SELV (5V) SMW250-03...
  • Page 49 CONNECTOR DESCRIPTION HT SELV NO. OF LOCATION BOARD SILK Flame Detect Sensor OP.S Operating Water Temperature Sensor DH.S DHW Temperature Sensor SELV (5V) LWD1140-14 Inlet Water Temperature Sensor BG.S Exhaust Temperature Sensor ST.S Unused SP.S Unused AGM Stepper Motor Coil / Y Phase SELV (24V) AWGM Stepper Motor Coil / X Phase CN12...

  • Page 50: Part 10 Operating System Instructions

    TANKLESS WATER HEATER PART 10 Operating system instructions A. CONTROL PANEL Figure 30 – Water Heater Control Panel Detail B. LCD DISPLAY DESCRIPTIONS Figure 31 – LCD Display Detail LCD also features a backlit lamp that will illuminate: • When a user action is detected (a button is pressed) •...

  • Page 51: Start-Up Sequence

    C. START -UP SEQUENCE After the appliance is powered ON, the LCD display shows a sequence of information. The icons will flash, followed by various indicators that describe the appliance controller and software versions. It will take the appliance roughly 15 seconds to cycle through the Start-Up Sequence. Display Items Time for Display Remarks...

  • Page 52: Changing The Dhw Set-Point

    TANKLESS WATER HEATER D. CHANGING THE DHW SET -POINT The setpoint cannot be changed if water is flowing through the unit. Ensure there is no NOTE: demand on the water heater when changing setpoint. The display shows the icon when the DHW set-point can be changed. HIGH Figure 33 –...

  • Page 53: Installer Mode

    Figure 34 – Status Mode Screens Parameter Detail Description A: Li or A: GA Flow Unit Current Flow Unit (Li: Liters/min, GA: Gallons/min) b: Fr Fan Speed (RPM) Current Fan Speed RPM Value C: Lc Lock Mode Lock Mode is In Use (ON) or Unused (OFF) Allows user to lock out any temperature change.

  • Page 54: Error Mode

    TANKLESS WATER HEATER Parameter Parameter Index Default 1: EH E0:00 Error History Ten Most Recent Error Codes (H0 – H9) Select “ON” to Clear Error History 2: cE Clear Error History Range: ON and OFF Restores System to Default Factory Settings 3: In System Reset (Burner operation time, Ignition cycles, and Supply power time will not be...
  • Page 55 The following screen will display when the water heater encounters an error. Figure 36 – Error Mode Screen...
  • Page 56 TANKLESS WATER HEATER Error Code Description Possible Remedies Error Code Er:10 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 water heater while in operation. Ensure pressure is between values referred in table 15.
  • Page 57 Error Code Description Possible Remedies Error Code Er:31 Water Inlet Sensor Open or Short This Error Code will go away when inlet water temperature decreases. If Error happens again: 1. Check inlet water temperature sensor. Ensure connections are secure. 2. Check sensor resistance. If resistance is zero, replace the sensor. 3.
  • Page 58 TANKLESS WATER HEATER Error Code Description Possible Remedies Error Code Er:41 Fan Speed too High with Flame On Press the Power button to clear the Error Code. If Error happens again: 1. Check the vent connections for blockages. 2. Check the burner assembly. 3.
  • Page 59 Error Code Description Possible Remedies Error Code Er:70 Register, Ram, Rom, I/O Port, AD Abnormal, This Error Code will go away when the condition is remedied. If Error Important EPROM Data or Safe Data Abnormal happens again: 1. Turn power OFF and ON at the main power switch internal to the water heater.

  • Page 60: Error Tree Analysis

    TANKLESS WATER HEATER K. ERROR TREE ANALYSIS 1. FLAME DETECTION Figure 37 – Flame Detection Error Analysis Tree...

  • Page 61: Gas Detection

    2. GAS DETECTION Figure 38 – Gas Detection Error Analysis Tree 3. AIR PRESSURE SWITCH Figure 39 – Air Pressure Switch Analysis Tree...

  • Page 62: Inlet / Dhw / Operating Temperature Sensors

    TANKLESS WATER HEATER 4. Inlet / DHW / Operating Temperature SENSORS Figure 40 – Inlet / DHW / Operating Temperature Sensors Error Analysis Tree...

  • Page 63: Part 11 Final Installation Checklist

    PART 11 Final installation checklist Is there enough space to ensure proper installation? Does installation location allow for proper service clearances? Are water and gas lines properly sized and set at proper pressures for the installation? BEFORE INSTALLING Is water heater location as near the exhaust vent / intake pipe terminations as possible? Have combustible materials been cleared from the installation location? Is there a drain close to the water heater? Does water heater loop piping meet the minimum sizing requirements listed?
  • Page 64 TANKLESS WATER HEATER Figure 41 – Flame Sight Glass DHW Inlet Temperature Sensor DHW Outlet Temperature Sensor (50315240243) (50315240123) Exhaust Temperature Sensor HX (OP) Temperature Sensor (50315240313) (50315240513) Temperature (ºF) Resistance (Ω) Temperature (ºF) Resistance (Ω) 62162 28409 48440 22152 38045 17408 30107...

  • Page 65: Part 12 Troubleshooting

    PART 12 Troubleshooting TROUBLESHOOTING CHART POSSIBLE REMEDIES PROBLEM POSSIBLE CAUSES 1. Is the plug on the power supply cord unplugged from the 1. Reset the plug. electrical outlet? 2. Reset the circuit breaker. No electrical power 2. Is electrical panel’ s 10 Amp circuit breaker tripped? 3.

  • Page 66: Part 13 Maintenance Procedures

    TANKLESS WATER HEATER Diagnostic Display Condition Possible Corrective Actions Check wiring for short circuit or incorrect Correct wiring per wiring diagram including Nothing appears on wiring connection of transformer to the control the display control Control is not Check transformer connection to the panel but the fan runs receiving power control per wiring diagram.
  • Page 67 Combustible/Flammable Materials Do not store combustible materials, gasoline, or other flammable vapors or liquids near the water heater. If found, remove these materials immediately. Air Contaminates If allowed to contaminate combustion air, products containing chlorine or fluorine will produce acidic conden- sate that will cause significant damage to the water heater.
  • Page 68 TANKLESS WATER HEATER Check Pressure Relief Valve • Visually inspect the primary pressure relief valve and discharge pipe for signs of weeping or leakage. • If the pressure relief valve often weeps, the expansion tank may not be operating properly. Immediately contact a qualified service technician to inspect the water heater and system.
  • Page 69 7. Dry the filter completely. Then reinsert the filter into the plastic assembly. 8. Replace the front cover of the water heater cabinet. Reconnect power supply to the water heater. 9. Press the Power button on the control panel to turn on the water heater. Check Primary and Gas Piping •...
  • Page 70 TANKLESS WATER HEATER Figure 43 – Draining the Water Heater 6. Reinstall the cold water inlet filter. Restore water service to the water heater by opening the isolation valves, or turning on the main water valve. 8. Turn on the gas valve. Turn on electrical power to the water heater and press the Power button to turn the water heater on.
  • Page 71 4. Pour tankless water heater cleaning solution into the bucket. Ensure the cleaning solution is approved for potable water systems. Place the drain hose (D1) and hose D2 to the pump inlet in the cleaning solution. 5. Open service valves (V3 and V4) on the hot water outlet and cold water inlet lines. 6.

  • Page 72: Replacement Parts

    TANKLESS WATER HEATER REPLACEMENT PARTS Figure 45 – Cabinet Replacement Parts NUMBER DESCRIPTION PART NUMBER NUMBER DESCRIPTION PART NUMBER AIR PRESSURE SWITCH EXHAUST CONNECTOR ASSEMBLY 50315240013 50315240153 CASE 50315240023 DISPLAY BRACKET 50315240163 DISPLAY DOOR ASSEMBLY 50315240033 50315240173 CONTROL BOARD (PCB) FRONT COVER 50315240043 50315240183...
  • Page 73 Figure 46 – Heat Exchanger Replacement Parts DESCRIPTION NUMBER DESCRIPTION PART NUMBER NUMBER PART NUMBER HEAT EXCHANGER ASSEMBLY 50315240293 FLAME DETECTOR SENSOR 50315240493 MIXING VALVE 31-1 EXHAUST PIPE ASSEMBLY (UP) 50315240303 50315240503 H/X TEMPERATURE SENSOR 31-2 EXHAUST TEMPERATURE SENSOR 50315240313 50315240513 31-3 EXHAUST GASKET...
  • Page 74 TANKLESS WATER HEATER In unusually dirty or dusty conditions, care must be taken to keep water CAUTION heater cabinet door in place at all times. Failure to do so VOIDS WAR- RANTY! Allowing the water heater to operate with a dirty combustion chamber will hurt operation.

  • Page 75: Maintenance Report

    MAINTENANCE REPORT INSPECTION ACTIVITIES DATE LAST COMPLETED PIPING 1st YEAR 2nd YEAR 3rd YEAR 4th YEAR* Near water heater Check water heater and system piping for any sign of leakage. Leaking pipes could cause property damage. piping Make sure all piping is properly supported. Flush tankless heat exchanger annually (more in hard water conditions).
  • Page 76 TANKLESS WATER HEATER ADDITIONAL INSTALLATION REQUIREMENTS FOR THE COMMON WEALTH OF MASSACHUSETTS In the Commonwealth of Massachusetts, the installer or service agent shall be a plumber or gas fitter licensed by the Commonwealth. When installed in the Commonwealth of Massachusetts or where applicable state codes may apply; the unit shall be installed with a CO detector per the requirements listed below.
  • Page 77 3. SIGNAGE. A metal or plastic identification plate shall be permanently mounted to the exterior of the building at a minimum height of eight (8) feet above grade directly in line with the exhaust vent terminal for the horizontally vented gas fueled heating appliance or equipment. The sign shall read, in print size no less than one-half (1/2) inch in size: “GAS VENT DIRECTLY BELOW, KEEP CLEAR OF ALL OBSTRUCTIONS”.

  • Page 78: Maintenance Notes

    TANKLESS WATER HEATER MAINTENANCE NOTES...
  • Page 79 Customer: Please only sign after the installer has reviewed the installation, safety, proper operation and maintenance of the system. In the case that the system has any problems, please call the installer. If you are unable to make contact, please contact your American Standard Sales Representative. Distributor/Dealer: Please insert contact details.

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Tcwh-180-as

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