Residential Tankless Water Heater INSTALLATION START-UP MAINTENANCE PARTS WGRT**150 / WGRT**199 **A suffix of “NG” denotes natural gas; “LP” denotes propane gas NOTICE: Westinghouse 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.
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.
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.
INSTALLATIONS MUST COMPLY WITH: Local, state, provincial, and national codes, laws, regulations and ordinances. The latest version of the National Fuel Gas Code, ANSI Z223.1, from American Gas Association Laboratories, 8501 East Pleasant Valley Road, Cleveland, OH 44131. In Canada – CGA No. B149 (latest version), from Canadian Gas Association Laboratories, 55 Scarsdale Road, Don Mills, Ontario, Canada M3B 2R3. Also, Canadian Electrical Code C 22.
E. VENT TERMINATION .............................................................................................................................................................. 25 1. Direct Vent, Two Pipe Roof and Sidewall Vent Terminations ................................................................................................ 25 2. Direct Vent, Optional Horizontal and Vertical Vent Kits .........................................................................................................
3. Inlet / DHW / Operating Temperature SENSORS ..................................................................................................................... 62 PART 11 – FINAL INSTALLATION CHECKLIST ..................................................................................................................... 63 PART 12 – TROUBLESHOOTING ............................................................................................................................................
Vent Screens (2” Mesh - 7850P-088) (3” Mesh - 7855P-085) 2 Screens Table 1 – Items Included with the Water Heater PART 2 – SAFETY REGULATIONS A. OPERATION AND INSTALLATION WARNINGS To avoid serious injury or death, read, understand, and follow all the precautions listed here. 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.
NOTICE If the water heater is exposed to the following, do not operate until all corrective steps have been made by a qualified service technician: 1. FIRE 2. DAMAGE 3. WATER DO NOT alter or modify the water heater or water heater controls. This can be dangerous and WILL VOID the warranty. This water heater is equipped with a three prong plug. It should only be plugged directly into a properly grounded three prong receptacle. DO NOT remove the ground plug from the plug.
If you suspect that your water is contaminated in any way, discontinue use of the appliance and contact an authorized technician or licensed professional. Contaminant Total Hardness o (Residential Use - Below 140 F water temperature) Total Hardness o (Commercial Use - 140 F and above water temperature) Aluminum Chloride Copper Maximum Allowable Level Contaminant Maximum Allowable Level 200 mg/l (12 grains/gallon) Manganese 0.05 mg/l or PPM 120 mg/l (7 grains/gallon) pH 6.5-8.
PART 3 – TECHNICAL SPECIFICATIONS MODEL Installation Minimum / Maximum Input (Btu/Hr) o 35 F Rise Hot Water o 45 F Rise Capacity o 77 F Rise Flue System Vent Run Weight (lbs) Energy Factor (EF) Uniform Energy Factor (UEF) NG Orifice Size LP NG Gas Supply Pressure LP Min (3”) Manifold Pressure Max (3”) Main Supply Power Supply Maximum Power Consumption General Operating Conditions Ignition System Burner System Gas Valve System Minimum Flow Rate Internal Pipe Material Dimensions Sub Heat Exchanger Water
Figure 1 – 150 Model Specifications and Dimensions DESCRIPTION A Exhaust Outlet Pipe B Air Intake C Gas Inlet D DHW Outlet Adapter E DHW Inlet Adapter F Condensate Adapter G DHW Inlet Filter Table 5 – 150 Model Adapter Specifications DIAMETER 2” 2” ¾” ¾” ¾” ½” N/A WHL-004 REV. 5.26.
Figure 2 – 150 Model Components NUMBER COMPONENT DESCRIPTION 1 Exhaust Vent Adapter 2 Air Inlet Pipe 3 Ignition Transformer 4 Igniter 5 Flame Detection Sensor 6 Hot Water Outlet 7 Manual Power Switch 8 Control Panel 9 Main Controller 10 Mixing Valve 11 DHW Outlet Adapter 12 Condensate Trap 13 Gas Inlet Adapter Table 6 – 150 Model Component List NUMBER 14 15 16 17 18 19 20 21 22 23 24 25 COMPONENT DESCRIPTION Cold Water Inlet Water Adjustment Valve Air Pressure Switch Gas Inlet Pipe Primary Heat Exchan
Figure 3 – 199 Model Specifications and Dimensions DESCRIPTION A Exhaust Outlet Pipe B Air Intake C Gas Inlet D DHW Outlet Adapter E DHW Inlet Adapter F Condensate Adapter G DHW Inlet Filter Table 7 – 199 Model Adapter Specifications DIAMETER 3” 3” ¾” ¾” ¾” ½” N/A WHL-004 REV. 5.26.
Figure 4 – 199 Model Components NUMBER COMPONENT DESCRIPTION 1 Exhaust Vent Adapter 2 Air Inlet Pipe 3 AGM (Air Gas Mixer) 4 Ignition Transformer 5 Igniter 6 Flame Detection Sensor 7 Primary Heat Exchanger Assembly 8 Hot Water Outlet 9 Mixing Valve 10 Air Pressure Switch 11 N/A 12 Manual Power Switch 13 Water Adjustment Valve 14 Main Controller 15 Secondary Heat Exchanger Assembly 16 Gas Inlet Pipe 1 17 Flame Sight Glass 18 Burner Case Table 8 – 199 Model Component List NUMBER 19 20 21 22 23 24 25 26 2
A. BEFORE LOCATING THE WATER HEATER Incorrect ambient conditions can lead to damage to the heating system and put safe operation at risk. Ensure that the water heater installation location adheres to the information included in this manual. Failure to do so could result in property damage, serious personal injury, or death. Failure of water heater or components due to incorrect operating conditions IS NOT covered by product warranty. 1.
Do not introduce toxic chemicals, such as antifreeze or water heater treatments, into the water heater or any piping meant for potable water purposes. Ensure that all piping and components connected to the water heater are suitable for potable water applications. Do not use this water heater for space heating applications. Circulators suitable for DHW applications must be used. 6. Clean and flush system when reinstalling a water heater.
The space must be provided with correctly sized combustion/ventilation air openings for all other appliances located in the space with the water heater. For power venting installations using room air for combustion, refer to the venting section, this manual, for descriptions of confined and unconfined spaces. Do not install the water heater in an attic. Failure to comply with these warnings could result in substantial property damage, severe personal injury, or death. E.
PRODUCTS TO AVOID Spray cans containing fluorocarbons Permanent wave solutions Chlorinated waxes/cleaners Chlorine-based swimming pool chemicals Calcium chloride used for thawing Sodium chloride used for water softening Refrigerant leaks Paint or varnish removers Hydrochloric or Muriatic acid Cements and glues Antistatic fabric softeners used in clothes dryers Chlorine-type bleaches, laundry detergents, and cleaning solvents Adhesives used to fasten building products Table 10 AREAS LIKELY TO HAVE CONTAM
Remove all sides of the shipping crate to allow the water heater to be lifted into its installation location. J. WALL-MOUNTING THE WATER HEATER 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 which cannot support its weight could result in property damage, personal injury, or death.
A. INTAKE PIPE AND EXHAUST VENT GUIDELINES 1. Vent system must be installed in accordance with local codes, or, in absence of local codes, the National Fuel Gas Code, ANSI Z223.1 / NFPA 54 and/or CSA B149.1, Natural Gas and Propane Installation Code. 2. For installation in Canada, installer supplied plastic vent piping must comply with CAN/CGA B149.1 and be certified to the Standard for Type BH Gas Venting Systems, ULC-S636.
Do not use the water heater to support any piping. DO NOT vent near soffit vents, crawl space vents, or other areas where condensate or vapor could create a nuisance or hazard or cause property damage. DO NOT vent where condensate vapor could cause damage or could be detrimental to the operation of regulators, relief valve, or other equipment. DO NOT vent the water heater in a chimney flue serving a separate appliance designed to burn solid fuel.
Figure 7 – Vent Termination Detail A B C D E F G H I J K DESCRIPTION Clearance above grade, veranda, porch, deck, or balcony Direct Vent Clearance to window or door that may be opened Power Vent Clearance to permanently closed window Vertical clearance to ventilated soffit located above the terminal within a horizontal distance of 2 feet from the center line of the terminal Clearance to unventilated soffit Clearance to outside corner Clearance to inside corner Clearance to each side of center line
B. APPROVED VENT MATERIALS NOTICE Consult Table 12 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. Item Exhaust vent or Intake pipe and fittings Pipe Cement Pipe Primer APPROVED EXHAUST VENT AND INTAKE PIPE MATERIAL Standards for Installation in: Material United States Canada PP, CPVC, and PVC venting must be CPVC schedule 40 ASTM-D2846 ULC-S636 Certified.
o 2.5 feet (.75M) for each additional 3” 45 elbow o 8 feet (2.4M) for each additional 2” 90 elbow o 4 feet (1.2M) for each additional 2” 45 elbow o Some terminations are considered elbows, and deduction should be applied. For example, a turndown 90 or an o open T termination should be considered a 90 elbow. For 2” diameter installations, install a reducing coupling in a vertical section of pipe ABOVE the pipe clamp installed on the water heater. See Figure 9. o b.
E. VENT TERMINATION 1. Direct Vent, Two Pipe Roof and Sidewall Vent Terminations Figure 10 – Direct Vent, Roof and Sidewall Vent Terminations 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.
2. Direct Vent, Optional Horizontal and Vertical Vent Kits Figure 11 – Direct Vent, Vent Terminations (With Optional Kits) 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.
4. Power Venting, Indoor Combustion Air Installation in Confined or Unconfined Space This appliance requires fresh, uncontaminated air for safe operation and must be installed in a mechanical room where there is adequate combustion and ventilating air. NOTE: To prevent combustion air contamination, see Table 10. Combustion air from the indoor space can be used if the space has adequate area or when air is provided through a duct or louver to supply sufficient combustion air based on the appliance input.
Figure 14 – NOTE: These drawings are meant to demonstrate system venting only. The installer is responsible for all equipment and detailing required by local codes. WHL-004 REV. 5.26.
F. COMMON VENT PIPING – 199 MODEL ONLY! DO NOT ATTEMPT to common vent 150 model water heaters. Doing so will result in property damage, severe personal injury, or death. Common Vented water heaters must be direct vented, with an exhaust vent and intake air pipe vented to the outdoors. DO NOT power vent Common Vented water heaters! Doing so will result in property damage, severe personal injury, or death. These units can be common vented.
2. RECOMMENDED EXHAUST PIPE TRANSITIONS Figure 15 – Recommended Exhaust Pipe Transitions 3. TWO PIPE VENT SYSTEM (DIRECT VENT) DO NOT ATTEMPT to common vent 150 model water heaters. Doing so will result in property damage, severe personal injury, or death. Common Vented water heaters must be direct vented with an exhaust vent and intake air pipe vented to the outdoors. DO NOT power vent Common Vented water heaters! Doing so will result in property damage, severe personal injury, or death.
Figure 16 – Common Vented Water Heaters – Unbalanced Venting (199 Model) 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. Appliance venting must be readily accessible for visual inspection for the first three feet from the appliance.
Figure 17 –Common Vented Direct Vent Configurations (199 Model) 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. Appliance venting must be readily accessible for visual inspection for the first three feet from the appliance.
PART 6 – INSTALL THE CONDENSATE DRAIN 1. Due to its efficient design, the water heater produces condensate (water) as a normal by-product. This condensate is acidic, with a pH level between 3 and 4. This condensate must be drained away from the water heater and disposed in accordance with all local regulations. 2. Use corrosion-resistant materials to drain condensate. Use the included flexible plastic hose or ½” PVC and CPVC drain pipe complying with ASTM D1785, F441, or D2665 may be used.
Maximum Natural Gas Delivery Capacity – Length of Black Iron Pipe (Sch. 40 Metallic) in Feet Cubic Feet per Hour (0.60 Specific Gravity, 0.
Figure 19 – Gas Line With Shut-Off Valve Detail 6. Test the gas pressure to make sure it meets the minimum standards and does not exceed the maximum standards of the water heater. 7. Leak test the gas line pipe before placing the water heater in operation. Only use approved leak detector liquid solutions to check for leaks. 8. Do not operate the water heater until all connections have been completed and the heat exchanger is filled with water.
C. ADDITIONAL PRECAUTION FOR EXCESS FLOW VALVE (EFV) If an excess flow valve (EFV) is in the gas line, check the manufacturer’s minimum and maximum flow capacity ratings. An improperly sized EFV will not allow for a full flow of gas to the water heater and will cause the water heater to malfunction. See Figure 22. D. ADJUSTING GAS PRESSURE AT THE WATER HEATER NOTE: Refer Figure 23 when adjusting gas pressure. Loosen the bolts before checking the gas inlet pressure. 1.
2. When low fire settings have been obtained, flip DIP switch seven (7) to its original (OFF) position. This will return the appliance to normal mode. 3. Flip DIP switch six (6) to ON (high fire). Again check combustion readings with a combustion analyzer. 4. When complete, flip DIP switch six (6) to its original (OFF) position. This will return the appliance to normal mode. Shut off water at hot water faucet. 5. Allow appliance to operate normally. Ensure it is operating properly. 6.
Figure 26 – DHW Piping, Single Water Heater Figure 27 – 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. WHL-004 REV. 5.26.
Figure 28 – Water Heater with Storage Tank Figure 29 – 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. WHL-004 REV. 5.26.
Figure 30 – Multiple Water Heater Piping – Cascaded System Figure 31 – Multiple Water Heater Piping – Cascaded System - Recirculation NOTE: These drawings are meant to show system piping concept only. Installer is responsible for all equipment and detailing required by local codes. WHL-004 REV. 5.26.
Figure 32 – Multiple Water Heater Piping – Cascaded System with Storage Tank Figure 33 – Multiple Water Heater Piping – Cascaded System with Storage Tank and Recirculation WHL-004 REV. 5.26.
Figure 34 – Water Heater with Air Handler – NOTE: There is a Built-In Flow Check in the Air Handler Loop NOTES: 1. Minimum pipe size should match connection size. Upsize pipe accordingly if greater flow is required. 2. A thermal expansion tank suitable for potable water must be sized and installed within this piping system between the backflow preventer and the cold water inlet. 3. All circulators should have an integral flow check. 4.
Figure 35 – Pressure Drop through the Heat Exchanger RECOMMENDED WATER PIPE SIZE o ∆T = 77 F Flow Water Pipe Rate Velocity Dia. (in) (GPM) (ft/s) 1 3/4 5 3.75 2 1 10 4.22 3 1 1/4 16 4.05 4 21 3.75 1 1/2 5 26 4.69 6 31 3.17 7 36 3.69 2 8 41 4.22 9 47 4.75 10 52 3.38 11 57 3.72 12 2 1/2 62 4.05 13 67 4.39 14 72 4.73 15 78 3.52 16 83 3.75 3 17 88 3.99 18 93 4.
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 36).
ELECTRICAL SHOCK HAZARD – To ensure safety, turn off electrical power supply at service entrance panel before making any electrical connections to avoid possible electric shock hazard. Failure to do so could result in property damage, serious personal injury, or death. A. WIRING INFORMATION 1. This water heater must be properly grounded. Ensure the electrical receptacle that the water heater will be plugged into is properly grounded. 2. Do not attach the ground wire to either the gas or water piping.
SYSTEM CONTROL SETTINGS MAXIMUM FLAME DETECTING VOLTAGE PRE-PURGE TIME (Tp) SAFETY TIME (IGNITING TIME) (Ts) IGNITING INTERVAL TIME POST-PURGE TIME (Tip) OVER-HEATING 1,2,3 PROTECTION DETECTION TIME TEMPERATURE SENSOR FAULT DETECTION TIME # OF IGNITION ATTEMPTS (Ntl) DHW SET TEMPERATURE RANGE DHW OFF TEMPERATURE DHW ON TEMPERATURE DHW WATER ON MINIMUM WATER FLOW DHW WATER OFF MINIMUM WATER FLOW Table 23 – System Control Settings 2.5V Maximum 10 seconds, minimum 1 second 3.
Figure 39 – 150 Model Electrical Wiring Diagram WHL-004 REV. 5.26.
Figure 40 – 150 Model Ladder Diagram WHL-004 REV. 5.26.
Figure 41 – 199 Model Electrical Wiring Diagram WHL-004 REV. 5.26.
Figure 42 – 199 Model Ladder Diagram WHL-004 REV. 5.26.
CONNECTOR PIN 1 2 3 4 CN9 5 65001WS-12 6 7 8 9-12 1 CN1 2 SMW250-03 3 1 2 3 CN4 LWD1140-06 4 5 6 1 CN8 2 SMW250-04 3 4 1 8 2 10 3 11 4 12 CN11 5 13 6 14 7 15 8 16 Table 24 – Water Heater Wiring 1 NO.
CONNECTOR NO. OF LOCATION PIN 1 8 2 9 3 10 CN7 4 LWD1140-14 11 5 12 6 13 7 14 1 2 3 CN12 4 SMW250-07 5 6 7 1 2 3 CN10 4 SMW250-08 5 6 7 8 1 2 3 4 CN14 5 SMW250-09 6 7 BOARD SILK 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.
PART 10 – OPERATING SYSTEM INSTRUCTIONS A. CONTROL PANEL Figure 43 – Water Heater Control Panel Detail B. LCD DISPLAY DESCRIPTIONS Figure 44 – LCD Display Detail LCD also features a backlit lamp that will illuminate: When a user action is detected (a button is pressed) The display has timed out for approximately 2 minutes C. START-UP SEQUENCE After the appliance is powered ON, the LCD display shows a sequence of information.
After start-up, the display appears as follows. Figure 45 – Initial Display Screen The Control System can operate through user and service modes that have specific LCD outputs and dedicated controls, including: Changing the Set-Point Temperature Error Mode Status Display Mode Installer Mode High Elevation Mode Cascade Mode High Temperature Mode NOTE: The Control System will not allow changes if Lock Mode is activated unless the B button is pressed for more than 5 seconds. D.
G. STATUS DISPLAY MODE Status Display Mode will activate when button B is pressed and held for five seconds at Standby Mode. Figure 47 – Status Mode Screens Parameter A: Li or A: GA b: Fr Description Current Flow Unit (Li: Liters/min, GA: Gallons/min) Current Fan Speed RPM Value Lock Mode is In Use (ON) or Unused (OFF) C: Lc Lock Mode Allows user to lock out any temperature change.
3: In OFF System Reset (Factory Setting) 4: Fu GA Flow Unit 5: FH 00 Maximum Fan speed 6: FL 00 Minimum Fan speed 7: dr NO Reset Burner Operation Time 8: dI NO Reset Ignition Cycle 9: HA 0-2 High Elevation Mode 10: Cn 00 Cascade Address 11: CI 01 Number of Water Heaters to Run During Initial DHW Demand 12: Eh ON Vent Setup (Common/Individual Vent) 13: Ct 01 Cascade Parameter Restores System to Default Factory Settings (Burner operation time, Ignition cycles, and Supply p
open or shorts, etc.). The water heater shall enter a hard lockout if the condition indicates something more serious (flame, ignition, condensate line, etc.) To clear a hard lockout Error Code, press the Power button. The following screen will display when the water heater encounters an error.
Error Code Error Code Description Possible Remedies Er:35 Exhaust Sensor Open or Short This Error Code will go away when exhaust temperature decreases. If Error happens again: 1. Check exhaust temperature sensor. Ensure connections are secure. 2. Check sensor resistance. If resistance is zero, replace the sensor. 3. Check exhaust vent for blockage. 4. If the problem persists, replace the main control.
Error Code Error Code Description Er:72 Flame Signal Detected before Ignition Er:73 DIP Switch is abnormal Er:76 Poor Communication Er:78 Cascade Communication Error Possible Remedies This Error Code will go away when the condition is remedied. 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 secure. Normal operating settings are more than 2.
12:Eh - Choose the vent option (ON – Common vent; OFF – individual vent) – It is very important to choose the proper settings to avoid safety issues. NOTE: When common vent is selected, there will be a safety shutdown if one of the units loses power, or if there is an error with fan and or control board. WARNING: DO NOT attempt to Common Vent 150 model appliances. WARNING: DO NOT turn this function OFF when Common Venting the appliance.
5. Cascade Transition – Down Transition Transition 1 Over Capacity 5 to MAX 5 4-5 4 3-4 3 2-3 2 1-2 1 2 3 4 5 - The control valve reduces the flow when the load is over 80% of the total capacity.
2. AIR PRESSURE SWITCH Figure 52 – Air Pressure Switch Analysis Tree 3. Inlet / DHW / Operating Temperature SENSORS Figure 53 – Inlet / DHW / Operating Temperature Sensors Error Analysis Tree WHL-004 REV. 5.26.
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
Figure 54 – Flame Sight Glass DHW Inlet Temperature Sensor (7850P-015) Exhaust Temperature Sensor (7850P-070) Temperature (◦F) Resistance (Ω) -4 62162 5 48440 14 38045 23 30107 32 23998 41 19261 50 15562 59 12655 68 10353 77 8520 86 7051 95 5867 104 4908 113 4125 122 3485 131 2957 140 2520 149 2157 158 1854 167 1600 176 1386 185 1205 194 1051 203 920 212 808 Table 34 – Temperature Sensor Resistance DHW Outlet Temperature Sensor (7850P-019) HX (OP) Temperature Sensor (7850P-081) Temperature (◦F) Resista
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. TROUBLESHOOTING CHART POSSIBLE CAUSES POSSIBLE REMEDIES 1. Is the plug on the power supply cord unplugged 1. Reset the plug. from the electrical outlet? 2. Reset the circuit breaker. 2.
Ensure service switch and/or circuit breaker to water heater is turned ON Is there 120V at the service switch Nothing appears on the display control panel and no other water heater components are operating Control is not receiving 120V power Is the ON/OFF switch inside the water heater cabinet is turned on Check for 120V at the line voltage terminal block located inside the water heater cabinet Inspect the fuse.
Check the Status of the Control Panel Observe the Control Panel to ensure the water heater is powered on, and to check for any error codes. Clear any debris from the panel. Check Exhaust Vent and Intake Pipe Terminations Verify that the water heater exhaust vent and intake pipe terminations are clean and free of obstructions. Remove any debris from the exhaust vent or intake pipe openings.
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.
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. NOTE: Improper maintenance WILL VOID water heater warranty. 1. Disconnect electrical power to the water heater. 2. Close the shutoff valves on both hot water outlet and cold water inlet lines (V1 and V2). See Figure 58. 3.
REPLACEMENT PARTS Figure 58 – 150 Model Cabinet Replacement Parts NUMBER 1 2 3 4 4-1 4-2 4-3 5 6 6-1 6-2 7 8 9 DESCRIPTION Exhaust Assembly Exhaust and Intake Packing Air Intake Assembly Water Inlet Valve Assembly Cold Water Temperature Sensor Water Inlet Filter Cap Cold Water Filter Bracket (Igniter, Air Pressure Switch) Hot Water Pipe Assembly Hot Water Plug Hot Water Temperature Sensor Igniter Condensate Trap Siphon Air Pressure Hose PART NUMBER 7850P-117 7850P-118 7850P-119 7850P-018 7850P-015 785
Figure 59 – 150 Model Heat Exchanger Replacement Parts NUMBER 1 2 3 3-1 3-2 3-3 3-4 3-5 4 4-1 4-2 4-3 4-4 DESCRIPTION Burner Fixing Bracket Blower Connector Packing Burner Assembly Ignition Rod Ignition Rod Gasket Overheat Switch (Burner) Burner Head Packing Burner Head Gasket Heat Exchanger Assembly Heat Exchanger Semi Assembly Condensate Bay Exhaust Temperature Sensor Secondary Heat Exchanger Packing Heat Exchanger Brackets (Left) Heat Exchanger Brackets (Right) PART NUMBER 7850P-133 7850P-225 7850
Figure 60 – 150 Model Combustion System Replacement Parts NUMBER DESCRIPTION Fan and AGM Assembly NG Fan and AGM Assembly LP Fan O-Ring Conversion Nozzle and Needle (NG) Conversion Nozzle and Needle (LP) AGM (Actuator) Silencer Body Gas Valve Assembly Gas Valve PART NUMBER 7850P-150 1 7850P-151 1-1 7850P-002 1-2 7850P-003 7850P-153 1-3 7850P-154 1-4 7850P-152 1-5 7850P-155 2 7850P-156 2-1 7855P-034 Table 39 – 150 Model Combustion System Replacement Parts NUMBER 2-2 2-3 3 4 5 6 7 8 9 10 DESCRIPTION
Figure 61 – 199 Model Cabinet Replacement Parts NUMBER 1 2 3 3-1 3-2 3-3 4 5 6 7 7-1 7-2 DESCRIPTION EXHAUST ASSY CASE DOOR ASSY FRONT COVER DISPLAY PANEL BRACKET DISPLAY PANEL IGNITION TRANSFORMER GAS INLET NIPPLE OVERHEAT SENSOR DHW SUPPLY PIPE ASSY DHW SUPPLY PIPE WATER OUTLET SENSOR PART NUMBER 7850P-021 7850P-044 7850P-108 7850P-109 7850P-024 7850P-023 7850P-045 7850P-043 7850P-050 7850P-020 7850P-063 7850P-019 NUMBER 11 12 13 14 15 16 17 18 18-1 18-2 18-3 18-4 8 N/A N/A 19 9 10 SIPHON ASS
Figure 62 – 199 Model Heat Exchanger Replacement Parts NUMBER 31 31-1 31-2 31-3 PART NUMBER 7850P-032 7850P-033 7850P-070 7850P-071 NUMBER 36 37 38 39 DESCRIPTION FLAME DETECTOR SENSOR MIXING VALVE H/X TEMPERATURE SENSOR H/X OVERHEAT SWITCH PART NUMBER 7850P-031 7850P-054 7850P-081 7850P-051 7850P-034 40 DHW OUTLET PIPE 7850P-049 31-5 31-6 32 32-1 32-2 DESCRIPTION HEAT EXCHANGER ASSY EXHAUST PIPE ASSY (UP) EXHAUST TEMPERATURE SENSOR EXHAUST GASKET 1 EXHAUST PIPE ASSY (DOWN) W/ CONDENSATE COLLE
Limited Warranty for Residential Tankless Water Heaters Westinghouse warrants each instantaneous water heater and its parts to be free from defects in materials and workmanship according to the following terms, conditions, and time periods. UNLESS OTHERWISE NOTED THESE WARRANTIES COMMENCE ON THE DATE OF INSTALLATION. This limited warranty is only available to the original owner of this water heater, and is non-transferable.
15. Damages, malfunctions, or failures caused by operating the water heater with an empty or partially empty tank (“dry firing”), or failures caused by operating the water heater when it is not supplied with potable water, free to circulate at all times. 16. Failure of the heater due to the accumulation of solid materials and lime deposits. 17. Any damage or failure resulting from improper water chemistry, or heating anything other than potable water.
MAINTENANCE REPORT 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 installation location could result in water heater failure, property damage, personal injury, or death. Such product failures ARE NOT covered under warranty.
FINAL INSPECTION Check list Homeowner Verify that you have completed entire check list. WARNING: FAILURE TO DO SO COULD RESULT IN SERIOUS INJURY OR DEATH. Review what you have done with the homeowner. TECH SIGN OFF th Table 42 - *Continue annual maintenance beyond the 4 year as required. WHL-004 REV. 5.26.
MAINTENANCE NOTES WHL-004 REV. 5.26.
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.
