TANKLESS CONDENSING WATER HEATER INSTALLATION START-UP MAINTENANCE PARTS APPLICABLE MODEL: TCWH180S-AS TCWH199S-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.
TANKLESS WATER HEATER FOR YOUR SAFETY READ BEFORE LIGHTING WARNING If you do not follow these instructions exactly, a fire or explosion may result causing 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. B. BEFORE OPERATING Smell all around the appliance area for gas.
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. DANGER Indicates an imminently hazardous situation, which, if not avoided, will result in death or serious injury. WARNING Indicates a potentially hazardous situation, which, if not avoided, could result in death or serious injury.
TANKLESS WATER HEATER FOREWORD This manual is intended to be used in conjunction with other literature provided with the Water Heater. This includes all related control information. It is important that this manual, all other documents included with this system, and additional publications including the National Fuel Gas Code, ANSI Z223.1-2002, be reviewed in their entirety before beginning any work.
CONTENTS Part 1 Items shipped with the water heater 8 Part 2 Safety regulations 9 A. Operation and installation warnings 9 B. Improper combustion 11 C. Gas 11 D. When servicing the water heater 11 E. Water quality 11 F. Freeze protection 11 Part 3 Technical specifications 12 Part 4 Prepare water heater location 15 A. Before locating the water heater 15 B. Leveling 17 C. Clearances for service access 17 D. Residential garage installation 17 E. Exhaust vent and intake pipe 17 F.
TANKLESS WATER HEATER Part 6 Install the condensate drain 31 Part 7 Gas piping 32 A. Gas pipe sizing tables 32 1. Gas Pipe Sizing 32 2. Natural Gas Pipe Sizing 32 3. LP (Liquid Propane) Gas Pipe Sizing 33 B. Gas connection requirements 33 C. Adjusting gas pressure at the water heater 36 D. Setting and verifying the combustion setting 36 Part 8 Water piping A. General plumbing connection guidelines 38 B. Install a backflow preventer 38 C. Piping the water heater 39 D.
K. Error tree analysis 1. Flame detection. 2. Gas detection 3. Air pressure switch 4. Inlet / DHW / Operating Temperature SENSORS Part 11 Final installation checklist Part 12 Troubleshooting Part 13 Maintenance procedures 60 60 61 61 62 63 65 66 Replacement parts 72 Maintenance report 75 Maintenance notes 78 American Standard Water Heaters Customer installation record form on page 79.
TANKLESS WATER HEATER PART 1 Items shipped with the water heater ITEM DESCRIPTION QUANTITY Tankless Water Heater 1 Quick Reference Guide, User, and Installation Manuals 1 Each Condensate Hose (50315240703) 1 Anchors and Wall Mounting Bracket (50315240723) 4 Spare Parts Kit (Gaskets and O-Rings) (50315240693) 1 Vent Screens (3”) (50315240683) 2 Screens OPTIONAL PARTS (Not Included) 150 PSI Pressure Relief Valve ¾” Tankless DHW Isolation Valves Vent Screens (2” Mesh) (50315240733) Table 1 –
PART 2 Safety Regulations A. OPERATION AND INSTALLATION WARNINGS To avoid serious injury or death read, understand, and follow all the precautions listed here. DANGER Vapors from flammable liquids will explode and can cause a fire, resulting in personal injury or death. The water heater has a burner that can come on at any time and ignite vapors. DO NOT use or store flammable liquids around the water heater. Improper venting can cause a build-up of carbon monoxide.
TANKLESS WATER HEATER DO NOT use spray paint, hair spray, or any other flammable spray near the water heater or near the exterior fresh air intake port. DO NOT place any items in or around the exterior exhaust gas outlet port and/or fresh air inlet port that could restrict or block the flow in or out of the vent system. DO NOT store or place newspapers, laundry, or other combustible items near the water heater or the exterior exhaust gas outlet and/or fresh air inlet port.
B. IMPROPER COMBUSTION WARNING Do not obstruct the flow of combustion and ventilating air. Adequate air must be provided for safe operation. Failure to keep the exhaust vent and intake pipe clear of ice, snow, or other debris could result in property damage, serious personal injury, or death. C. GAS Should overheating or gas supply fail to shut off, do not turn off or disconnect electrical supply to the circulator. Instead, shut off the gas supply at a location external to the appliance. D.
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 35o°F Rise 9.8 Gal 11.0 Gal 45o°F Rise 7.6 Gal 8.5 Gal 77o°F Rise 4.4 Gal 5.
Figure 1 – Specifications and Dimensions Description Diameter A Exhaust Outlet Pipe 3” B Air Intake 3” 3/4” C Gas Inlet D DHW Outlet Adapter 3/4” E DHW Inlet Adapter 3/4” F Condensate Adapter 1/2” G DHW Inlet Filter N/A Table 4 – Adapter Specifications 13
TANKLESS WATER HEATER Figure 2 – Components NUMBER COMPONENT DESCRIPTION COMPONENT DESCRIPTION 1 Exhaust Vent Adapter 19 Exhaust Duct 2 Air Inlet Piper 20 Gas Valve 3 AGM (Air Gas Mixer) 21 Gas Inlet Pipe 2 4 Ignition Transfomer 22 BLDC Fan 5 Igniter 23 Air Intake Pipe Adapter 6 Flame Detection Sensor 24 Gas Inlet Adapter 7 Primary Heat Exchanger Assembly 25 Freeze Protector 8 Hot Water Outlet 26 DHW Outlet Adapter 9 Mixing Valve 27 Condensate Trap 10 Air Pressure Sw
PART 4 Prepare water heater location CAUTION 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 account before installation could result in wasted time, money, and possible property damage and personal injury. A.
TANKLESS WATER HEATER 2. Check for nearby connections to: • System water piping • Venting connections • Gas supply piping • Electrical power • Condensate drain CAUTION Locate the water heater where any leakage from the relief valve, related piping, tank, or connections will not result in damage to surrounding areas or lower floors of the building. The water heater should be located near a floor drain, or installed in proximity to an adequately emptied drain pan.
B. LEVELING CAUTION The water heater must be installed level in order for the condensate to properly 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’ location.
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. Exhaust vent and intake pipe may be vented vertically through the roof or out a sidewall.Venting methods are detailed in the Venting Section.
1. Seal any unused openings in the common venting system. 2.Visually inspect the venting system for proper size and horizontal pitch to determine if there is blockage, leakage, corrosion or other deficiencies that could cause an unsafe condition. 3. If practical, close all building doors, windows and all doors between the common venting system and other spaces in the building. Turn on clothes dryers and any appliances not connected to the common venting system.
TANKLESS WATER HEATER I. WALL-MOUNTING THE WATER HEATER WARNING The water heater must be installed on a wall that can bear its weight (more 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. The water heater may be installed on any suitable internal wall (suitable sound-proofing may be required when installing onto a stud partition wall).
PART 5 Venting DANGER Vent this water heater in accordance with these instructions. Failure to do so will result in property damage, severe personal injury, or death. WARNING DO NOT mix vent systems or materials unless specifically told to do so in this manual. DO NOT thermally insulate the exhaust vent or intake pipes. DO NOT use an electric damper, vent damper, or draft hood with this water heater. DO NOT locate the exhaust vent or intake pipe terminations where exposed to prevailing winds.
TANKLESS WATER HEATER 5. Do not install venting system components on the exterior of the building except as specifically required by these instructions. • Vent terminals must be at least 1 foot from any door, window, or gravity inlet into the building. • Maintain the correct clearance and orientation between the exhaust vent and intake pipe terminals. • The exhaust vent and air intake terminals must be at the same height and their center lines must be spaced apart 1 foot minimum.
• • • 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. Do not use the water heater to support any piping.
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.
C. ALLOWED SCHEDULE 40 COMBINED VENT LENGTHS (PVC, CPVC, PP) MODEL TCWH 180-AS / TCWH 199-AS 2” COMBUSTION AIR/ VENT PIPE 3” COMBUSTION AIR/VENT PIPE MAX MAX 50’ (15.24 M) 100’ (30 M) Table 10 – Approved Combined Vent Lengths NOTE: When using more than 1 elbow, reduce maximum allowable length: • 5 feet (1.5 M) for each additional 3” 90º elbow • 2.5 feet (.75 M) for each additional 3” 45º elbow • 8 feet (2.4 M) for each additional 2” 90º elbow • 4 feet (1.2 M) for each additional 2” 45º elbow D.
TANKLESS WATER HEATER E.VENT TERMINATION 1. Two Pipe Roof and Sidewall Vent Terminations TWO PIPE SIDEWALL VENTING WITH TEE (INTAKE) INSERT INLET/EXAHUST AND COUPLING (EXHAUST) TWO PIPE ROOF VENTING WITH TEE (INTAKE) AND COUPLING (EXHAUST) SCREENS INTO EACH END OF TEE INSERT INLET/EXAHUST SCREEN INTO STRAIGHT COUPLING EXTERIOR WALL STRAIGHT COUPLING INSERT INLET/EXAHUST SCREEN INTO STRAIGHT COUPLING 24” MIN.
2. Direct Vent, Optional Horizontal and Vertical Vent Kits. Figure 9 – Direct Vent,Vent Terminations (With Optional Kits) WARNING All vent pipes must be glued, properly supported, and the exhaust must be pitched a minimum of ¼” per foot back to the appliance to allow drainage of condensate. When placing support brackets on vent piping, the first bracket must be within 1-foot of the appliance and the balance at 4-foot intervals on the vent pipe.
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.
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 detectors should be installed outside each sleeping area. Never operate the heater unless it is vented to the outdoors.
TANKLESS WATER HEATER OUTDOOR COMBUSTION AIR (SINGLE PIPE) EXAHUST VENT UPPER AIR DUCT BOILER OR 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.
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. 2. Use corrosion-resistant materials to drain condensation. Use the included flexible plastic hose or ½” PVC and CPVC drain pipe complying with ASTM D1785, F441, or D2665 may be used.
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). This water heater must be converted into propane operation unless specifically manufactured for use with propane. Follow Gas Conversion Manual instructions (separate document).
Maximum Natural Gas Delivery Capacity - Length of Corrugated Stainless Steel Pipe in Feet Pipe Size Cubic Feet per Hour (0.60 Specific Gravity, 0.
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. 4. A manual gas shut-off valve should be installed in the gas supply line close to the water heater. See Figure 15 for detail. 5.
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 35
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 system during any pressure testing of the system at test pressures greater than ½ psi (3.5 kPa). 2.
WARNING It is required to use a combustion analyzer to verify final adjustment according to 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). See Figure 19. Check your combustion values.
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” of the bottom connections of the water heater. Doing so could damage the water heater. Such damages ARE NOT covered by product warranty. The size of the hot water pipe should be ¾” diameter.
C. PIPING THE WATER HEATER Use at least the MINIMUM pipe size for all water heater loop piping. This is 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. Such problems ARE NOT covered by product warranty. CAUTION D.
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.
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.
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. This water heater must be provided with an approved 150 psi, ¾” ASME HV Valve that must be installed on the DHW outlet line (See Figure 30).
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.
TANKLESS WATER HEATER PART 9 Connect electrical power / Initial startup WARNING Install wiring and electrically ground water heater in accordance with the authority having jurisdiction or, in the absence of such an authority, follow the National Electrical Code, NFPA 70, and/or CSA C22.1 Electrical Code-Part 1 in Canada.
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. A. DIP SWITCHES There is one DIP switch. DIP switches 6 and 7 need to be set to off for the water heater to operate normally.
TANKLESS WATER HEATER Figure 28 – Electrical Wiring Diagram 46
Figure 29 - Ladder Dtagram 47
TANKLESS WATER HEATER CONNECTOR NO.
CONNECTOR NO. OF LOCATION PIN 1 8 2 9 3 CN7 LWD1140-14 10 4 11 5 12 6 13 7 14 DESCRIPTION F.S Flame Detect Sensor OP.S Operating Water Temperature Sensor DH.S DHW Temperature Sensor I.S Inlet Water Temperature Sensor BG.S Exhaust Temperature Sensor ST.S Unused SP.
TANKLESS WATER HEATER PART 10 Operating system instructions A. CONTROL PANEL Figure 30 – Water Heater Control Panel Detail B.
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 LCD Test 1 Sec 0.5 Sec 1 Sec 1 Sec 1 Sec 1 Sec 1 Sec 1 Sec 1 Sec 1 Sec All segments “ON” All segments “OFF” Pdn 0061 SPn 00.XX SFn XX.
TANKLESS WATER HEATER D. CHANGING THE DHW SET-POINT NOTE: The setpoint cannot be changed if water is flowing through the unit. Ensure there is no demand on the water heater when changing setpoint. The display shows the HIGH icon when the DHW set-point can be changed. Figure 33 – DHW Set-Point Screens Press the button when the display panel is powered ON to change the DHW Set-Point. The DHW icon and current set-point will display and flash. This indicates that the DHW Set-Point can be changed.
Figure 34 – Status Mode Screens Parameter A: Li or A: GA b: Fr C: Lc Detail Flow Unit Fan Speed (RPM) Lock Mode d: oP E: dH F: Eh h: In L:rt OP Temperature DHW Outlet Temperature Exhaust Temperature Inlet Temperature Running Time Power Supply Time Burner Operating Time Burner Operating Time Ignition Attempts Number Ignition Attempts Number 1: PH 2: rh 3: rH 4: It 5: IH L:rt J: AG AGM Value Correction Description Current Flow Unit (Li: Liters/min, GA: Gallons/min) Current Fan Speed RPM Value Lock Mod
TANKLESS WATER HEATER Index Default Parameter Parameter 1: EH 2: cE E0:00 OFF Error History Clear Error History 3: In OFF Ten Most Recent Error Codes (H0 – H9) Select “ON” to Clear Error History Range: ON and OFF Restores System to Default Factory Settings (Burner operation time, Ignition cycles, and Supply power time will not be reset) Range: ON or OFF Displays Flow Rate in Liters/Minute or Gallons/Minute Range: GA or Li Adjusts Maximum Fan Speed Range: -30 - +30 Adjusts Minimum Fan Speed Range:
The following screen will display when the water heater encounters an error.
TANKLESS WATER HEATER Error Code 56 Error Code Description Possible Remedies 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. 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.
Error Code Error Code Description Possible Remedies 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. If the problem persists, replace the main control. Er:32 Water Outlet Sensor Open or Short This Error Code will go away when outlet water temperature decreases.
TANKLESS WATER HEATER Error Code Description Error Code 58 Possible Remedies 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. Check fan operation. If fan appears to be operating normally but RPMs are too low or too high, replace the fan. 4. If the problem persists, replace the main control.
Error Code Error Code Description Possible Remedies Er:70 Register, Ram, Rom, I/O Port, AD Abnormal, Important EPROM Data or Safe Data Abnormal 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 water heater. 2. If the problem persists, replace the main control. Er:72 Flame Signal Detected before Ignition This Error Code will go away when the condition is remedied. If Error happens again: 1.
TANKLESS WATER HEATER K. ERROR TREE ANALYSIS 1.
2. GAS DETECTION Figure 38 – Gas Detection Error Analysis Tree 3.
TANKLESS WATER HEATER 4.
PART 11 Final installation checklist YES BEFORE INSTALLING INSTALL WATER PIPING INSTALL EXHAUST VENT AND INTAKE PIPING INSTALL CONDENSATE PIPING / TUBING AND COMPONENTS INSTALL GAS PIPING PRESSURE RELIEF VALVES WIRE THE WATER HEATER START-UP, ADJUST, AND TEST BURNER FLAME NO 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? Is water heater locat
TANKLESS WATER HEATER Figure 41 – Flame Sight Glass DHW Inlet Temperature Sensor (50315240243) Exhaust Temperature Sensor (50315240313) Temperature (ºF) -4 5 14 23 32 41 50 59 68 77 86 95 104 113 122 131 140 149 158 167 176 185 194 203 212 Resistance (Ω) 62162 48440 38045 30107 23998 19261 15562 12655 10353 8520 7051 5867 4908 4125 3485 2957 2520 2157 1854 1600 1386 1205 1051 920 808 Table 26 – Temperature Sensor Resistance 64 DHW Outlet Temperature Sensor (50315240123) HX (OP) Temperature Sensor (5031
PART 12 Troubleshooting PROBLEM No electrical power to the water heater No water available when a faucet is opened Hot water is not available when the faucet is opened. The water temperature is not hot enough or turns cold during use. It takes a long time before hot water flows from the faucet. The water is not hot enough. The water at the faucet is too hot. A fan can be heard even when the unit is not operating. TROUBLESHOOTING CHART POSSIBLE CAUSES 1.
TANKLESS WATER HEATER Diagnostic Possible Corrective Actions Check wiring for short circuit or incorrect Correct wiring per wiring diagram including wiring connection of transformer to the control Control is not Check transformer connection to the receiving power control per wiring diagram.
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 condensate that will cause significant damage to the water heater. Read the list of potential contaminates and areas likely to have these contaminates in Error! Reference source not found, Part 2.
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. Check the Condensate Drain System • While the water heater is running, check the discharge end of the condensate drain tubing.
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 • Remove the water heater cover and perform a gas leak inspection following Operating Instructions, page 2, this manual. If gas odor or leak is detected, follow procedures on page 2. Call a qualified service technician.
TANKLESS WATER HEATER Figure 43 – Draining the Water Heater 6. Reinstall the cold water inlet filter. 7. 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. Flushing the Water Heater Flushing the heat exchanger is a complicated procedure that should only be performed by a qualified service technician.
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. Turn on the circulation pump. Operate the pump and allow the cleaning solution to circulate through the water heater for at least 1 hour at a rate of 4 gallons per minute.
TANKLESS WATER HEATER REPLACEMENT PARTS Figure 45 – Cabinet Replacement Parts NUMBER DESCRIPTION 1 2 3 3-1 3-2 3-3 4 5 6 7 7-1 7-2 8 EXHAUST CONNECTOR ASSEMBLY CASE DOOR ASSEMBLY FRONT COVER DISPLAY PANEL BRACKET DISPLAY PANEL COVER IGNITION TRANSFORMER GAS INLET NIPPLE OVERHEAT SENSOR DHW SUPPLY PIPE ASSEMBLY DHW SUPPLY PIPE WATER OUTLET SENSOR N/A 9 10 CONDENSATE TRAP ASSEMBLY CONDENSATE AIR PRESSURE HOSE Table 29 – Cabinet Replacement Parts 72 PART NUMBER NUMBER 50315240013 50315240023 50315240
Figure 46 – Heat Exchanger Replacement Parts NUMBER 31 31-1 31-2 31-3 31-4 31-5 31-6 32 32-1 32-2 32-3 33 34 35 35-1 35-2 35-3 35-4 35-5 35-6 DESCRIPTION PART NUMBER NUMBER DESCRIPTION PART NUMBER HEAT EXCHANGER ASSEMBLY EXHAUST PIPE ASSEMBLY (UP) EXHAUST TEMPERATURE SENSOR EXHAUST GASKET EXHAUST PIPE ASSEMBLY W/ CONDENSATE COLLECTOR PAN (DOWN) EXHAUST H/X GASKET N/A FAN ASSEMBLY FAN BLOWER O-RING AGM (ACTUATOR) SILENCER ELBOW SILENCER BODY BURNER ASSY BURNER HEAD IGNITION ROD BRACKET IGNITION ROD BLO
TANKLESS WATER HEATER CAUTION In unusually dirty or dusty conditions, care must be taken to keep water heater cabinet door in place at all times. Failure to do so VOIDS WARRANTY! Allowing the water heater to operate with a dirty combustion chamber will hurt operation. Failure to clean the heat exchanger as needed by the WARNING installation location could result in water heater failure, property damage, personal injury, or death. Such product failures ARE NOT covered under warranty.
MAINTENANCE REPORT INSPECTION ACTIVITIES PIPING 1st YEAR Near water heater piping Check water heater and system piping for any sign of leakage. Leaking pipes could cause property damage. Make sure all piping is properly supported. Flush tankless heat exchanger annually (more in hard water conditions). See User’s Information manual for instructions. Vent Check condition of all vent pipes and joints. Ensure all vent piping is properly supported.
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. 5.08: Modifications to NFPA-54, Chapter 10 (1) Revise NFPA-54 section 1 0.5.4.
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”. 4. INSPECTION.
TANKLESS WATER HEATER MAINTENANCE NOTES 78 78
AMERICAN STANDARD WATER HEATERS CUSTOMER INSTALLATION RECORD FORM The following form should be completed by the installer for you to keep as a record of the installation in case of a warranty claim. After reading the important notes at the bottom of the page, please also sign this document.
