SHW-I-S Rev H Installation & Service Manual Models: SNR126-065, SNR151-100, SNR201-100, SNA151-100, SNA201-100, SNA286-125, SNA401-125, AND SNA501-125 WARNING: If the information in these instructions is not followed exactly, a fire or explosion may result causing property damage, personal injury or death. -- 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.
Contents PLEASE READ BEFORE PROCEEDING ...................... 3 Hazard Definitions ...................................................... 3 THE SHIELD -- HOW IT WORKS ............................... 4-6 RATINGS ......................................................................... 7 1. DETERMINE WATER HEATER LOCATION Closet and Alcove Installations ........................................ 8 Provide Clearances .......................................................... 8 Flooring and Foundation ...........
Installation & Service Manual Please read before proceeding Hazard definitions The following defined terms are used throughout this manual to bring attention to the presence of hazards of various risk levels or to important information concerning the life of the product. DANGER DANGER indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury.
Installation & Service Manual The Shield - How it works... 1. Access cover - front Provides access to the gas train, heat exchanger and controls. 2. 3. 20. Ignition electrode Allows for the connection of the PVC air intake pipe to the water heater. 21. Line voltage junction box Air pressure switch Air shroud (501-125 Model Only_Not Shown) The air shroud directs air and gas flow into the blower. 5. Blower The blower pulls in air and gas through the venturi (item 32).
Installation & Service Manual The Shield - How it works...
Installation & Service Manual The Shield - How it works...
Installation & Service Manual Ratings HLW Model Number CSA Note: Change “N” to “L” for L.P. gas models.
Installation & Service Manual 1 Determine water heater location Installation must comply with: WARNING • Local, state, provincial, and national codes, laws, regulations, and ordinances. • National Fuel Gas Code, ANSI Z223.1 – latest edition. • National Electrical Code. • For Canada only: B149.1 Installation Code, CSA C22.1 Canadian Electrical Code Part 1 and any local codes.
Installation & Service Manual 1 Determine water heater location (continued) Figure 1-1 Closet Installation - Minimum Required Clearances 1/4" (6.35 MM) MINIMUM CLEARANCE AROUND HOT WATER PIPES 1" (25.4 MM) MINIMUM CLEARANCE AROUND VENT PIPE For closet installations, CPVC, polypropylene or stainless steel vent material MUST BE used in a closet structure due to elevated temperatures. Failure to follow this warning could result in fire, personal injury, or death.
Installation & Service Manual 1 Determine water heater location Table 1A Corrosive Contaminants and Sources Flooring and foundation Products to avoid: Flooring Spray cans containing chloro/fluorocarbons The Shield water heater is approved for installation on combustible flooring, but must never be installed on carpeting.
Installation & Service Manual 1 Determine water heater location When using an existing vent system to install a new water heater: WARNING (continued) When removing a water heater from existing common vent system: Failure to follow all instructions can result in flue gas spillage and carbon monoxide emissions, causing severe personal injury or death.
Installation & Service Manual 1 Determine water heater location Maintain minimum specified clearances for adequate operation. All installations must allow sufficient space for servicing the vent connections, water pipe connections, piping and other auxiliary equipment, as well as the appliance. 1. If air is taken directly from outside the building with no duct, provide two permanent openings to the equipment room (see FIG.
Installation & Service Manual 1 Determine water heater location (continued) IF NECESSARY FOR TIGHT CONSTRUCTION Figure 1-6_Combustion Air from Outside - Single Opening Figure 1-5_Combustion Air from Interior Space 3. If air is taken from another interior space, each of the two openings specified above should have a net free area of one square inch for each 1000 Btu/hr (22 cm2 per kW) of input, but not less than 100 square inches (645 cm2) (see FIG. 1-5).
Installation & Service Manual 1 Determine water heater location Combustion air requirements are based on the latest edition of the National Fuel Gas Code, ANSI Z223.1; in Canada refer to the latest edition of CGA Standard CAN B149.1. Check all local code requirements for combustion air. All dimensions based on net free area in square inches. Metal louvers or screens reduce the free area of a combustion air opening a minimum of approximately 25%.
Installation & Service Manual 2 General venting Direct venting options - Sidewall Vent IMG00464 Figure 2-1 Two-Pipe Sidewall Termination - See page 23 for more details IMG00464 Figure 2-2 PVC/CPVC Concentric Sidewall Termination - See page 27 for more details Direct venting options - Vertical Vent IMG00466 IMG00466 IMG00466 Figure 2-3 Two-Pipe Vertical Termination - See page 30 for more details Figure 2-4 PVC/CPVC Concentric Vertical Termination - See page 32 for more details Figure 2-5 Vertic
Installation & Service Manual 2 General venting Install vent and combustion air piping DANGER The Shield water heater must be vented and supplied with combustion and ventilation air as described in this section. Ensure the vent and air piping and the combustion air supply comply with these instructions regarding vent system, air system, and combustion air quality. See also Section 1 of this manual.
Installation & Service Manual 2 General venting (continued) Requirements for installation in Canada 1. 2. 3. 4. Installations must be made with a vent pipe system certified to ULC-S636. The first three (3) feet of plastic vent pipe from the appliance flue outlet must be readily accessible for visual inspection. The components of the certified vent system must not be interchanged with other vent systems or unlisted pipe/fittings.
Installation & Service Manual 2 General venting Materials Air inlet pipe materials: The air inlet pipe(s) must be sealed. Choose acceptable combustion air inlet pipe materials from the following list: PVC, CPVC, Polypropylene or ABS Dryer Vent or Sealed Flexible Duct (not recommended for rooftop air inlet) Galvanized steel vent pipe with joints and seams sealed as specified in this section. Type “B” double-wall vent with joints and seams sealed as specified in this section.
Installation & Service Manual 2 General venting (continued) Optional room air NOTICE Optional room air is intended for commercial applications. Combustion air piping to the outside is recommended for residential applications. Commercial applications utilizing the Shield water heater may be installed with a single pipe carrying the flue products to the outside while using combustion air from the equipment room.
Installation & Service Manual 2 General venting PVC/CPVC 1. This product has been approved for use with the PVC/CPVC vent materials listed in Table 2D. Installing vent and air piping WARNING The vent connection to the appliance must be made with the starter CPVC pipe section provided with the appliance if PVC/CPVC vent is to be used. The field provided vent fittings must be cemented to the CPVC pipe section using an “All Purpose Cement” suitable for PVC and CPVC pipe.
Installation & Service Manual 2 General venting Polypropylene (continued) The installer must use a specific vent starter adapter at the flue collar connection. The adapter is supplied by the vent manufacturer to adapt to its vent system. See Table 2F for approved vent adapters. Discard CPVC starter piece. All vent connections MUST be secured by NOTICE the vent manufacturer's joint connector (FIG. 2-9). Insulation should not be used on WARNING polypropylene venting materials.
Installation & Service Manual 2 General venting Stainless steel vent Installation of a stainless steel vent system should adhere to the stainless steel vent manufacturer’s installation instructions supplied with the vent system. NOTICE This product has been approved for use with stainless steel using the manufacturers listed in Table 2G. Use only the materials, vent systems, and terminations listed in Tables 2G and 2H. DO NOT mix vent systems of different types or manufacturers.
Installation & Service Manual 3 Sidewall direct venting Vent/air termination – sidewall WARNING WARNING Follow instructions below when determining vent location to avoid possibility of severe personal injury, death, or substantial property damage. A gas vent extending through an exterior wall shall not terminate adjacent to a wall or below building extensions such as eaves, parapets, balconies, or decks.
Installation & Service Manual 3 Sidewall direct venting Vent/air termination – sidewall Figure 3-1C Alternate PVC/CPVC/SS/ Polypropylene Venting Arrangement (if Space Allows) w/Field Supplied Fittings TO BOILER INTAKE AIR CONNECTION 6. Locate terminations so they are not likely to be damaged by foreign objects, such as stones or balls, or subject to buildup of leaves or sediment.
Installation & Service Manual 3 Sidewall direct venting (continued) Figure 3-3B Alternate Clearance to Forced Air Inlets w/ Field Supplied Fittings Figure 3-4A PVC/CPVC Sidewall Termination Assembly IF LESS THAN 10’ 36” MIN. VENT FORCED AIR INLET 7’ MIN. ABOVE ANY PUBLIC WALKWAY BIRD SCREEN (TYPICAL) AIR PIPING AIR CENTERLINE WIDTH VENT PIPING VENT PLATE WALL PLATE VENT CAP GALVANIZED THIMBLE Prepare wall penetrations 1. 2. 3. 4. 5. 6. 7. 8. 9.
Installation & Service Manual 3 Sidewall direct venting Prepare wall penetrations (Alternate Field Supplied Option) 1. 2. Air pipe penetration: a. Cut a hole for the air pipe. Size the air pipe hole as close as desired to the air pipe outside diameter. Figure 3-5A Multiple Vent Terminations (must also comply with Figure 3-1A) 12" MIN. BETWEEN EDGE OF AIR INLET AND ADJACENT VENT OUTLET VENT Vent pipe penetration: a. Cut a hole for the vent pipe.
Installation & Service Manual 3 Sidewall direct venting (continued) Sidewall termination – optional concentric vent Description and usage Lochinvar offers optional concentric combustion air and vent pipe termination kits (Factory Kit #CVK3003 for 3" diameter - Models 126-065 - 201-100 and #CVK3007 for 4" diameter Models 286-125 - 501-125). Both combustion air and vent pipes must attach to the termination kit.
Installation & Service Manual 3 Sidewall direct venting Sidewall termination – optional concentric vent Figure 3-9 Concentric Vent Dimensional Drawing Models 126-065 -- 201-100 / CVK3003 Figure 3-10 Concentric Vent Dimensional Drawing Models 286-125 -- 501-125 / CVK3007 "A" "C" DIA. "B" DIA. "D" 3" (76 MM) "E" "G" "H" DIA. "B" DIA.
Installation & Service Manual 3 Sidewall direct venting (continued) Sidewall termination – optional concentric vent Figure 3-12 Concentric Vent Sidewall Attachment Note: CVK3003 shown for illustration purposes. CAUTION DO NOT use field-supplied couplings to extend pipes. Airflow restriction will occur and may cause intermittent operation. 9. Cement appliance combustion air and vent pipes to the concentric vent termination assembly. See FIG. 3-12 for proper pipe attachment. 10.
Installation & Service Manual 4 Vertical direct venting Vent/air termination – vertical WARNING Follow instructions below when determining vent location to avoid possibility of severe personal injury, death or substantial property damage.
Installation & Service Manual 4 Vertical direct venting (continued) Vent/air termination – vertical Prepare roof penetrations 1. Air pipe penetration: a. Cut a hole for the air pipe. Size the air pipe hole as close as desired to the air pipe outside diameter. 2. Vent pipe penetration: a. Cut a hole for the vent pipe.
Installation & Service Manual 4 Vertical direct venting Vertical termination – optional concentric vent Description and usage Lochinvar offers an optional concentric combustion air and vent pipe termination kit. Both combustion air and vent pipes must attach to the termination kit. The termination kit must terminate outside the structure and must be installed as shown in FIG. 4-4. Field supplied pipe and fittings are required to complete the installation.
Installation & Service Manual 4 Vertical direct venting (continued) Vertical termination – optional concentric vent WARNING Do not operate the appliance with the rain cap removed or recirculation of combustion products may occur. Water may also collect inside the larger combustion air pipe and flow to the burner enclosure. Failure to follow this warning could result in product damage or improper operation, personal injury, or death. DO NOT use field-supplied couplings to extend pipes.
Installation & Service Manual 5 System piping System water piping methods 2. If this water heater is installed in a closed water supply system, such as the one having a backflow preventer in the cold water supply, provisions must be made to control thermal expansion. DO NOT operate this water heater in a closed system without provisions for controlling thermal expansion. Warranties do not cover damages from thermal expansion such as pressure bulges and/or deformities.
Installation & Service Manual 5 System piping (continued) The following chart (Table 5A) details the relationship of water temperature and time with regard to scald injury and may be used as a guide in determining the safest water temperature for your applications. Table 5A Approximate Time / Temperature Scald Chart Piping components Check valves: Field supplied. Check valves are recommended for installation as shown in FIG.’s 5-2 thru 5-4.
Installation & Service Manual 5 System piping Figure 5-2 Single Unit COLD WATER SUPPLY FLOW CHECK VALVE (TYPICAL) SYSTEM CIRCULATOR MIXING VALVE (IF REQUIRED) BUILDING RETURN HOT WATER SUPPLY EXPANSION TANK BALL VALVE (TYPICAL) UNION (TYPICAL) IMG00471 NOTICE 36 Please note that these illustrations are meant to show system piping concept only, the installer is responsible for all equipment and detailing required by local codes.
Installation & Service Manual 5 System piping (continued) Figure 5-3 Multiple Units COLD WATER SUPPLY BUILDING RETURN FLOW CHECK VALVE (TYPICAL) SYSTEM CIRCULATOR BALL VALVE (TYPICAL) MIXING VALVE (IF REQUIRED) EXPANSION TANK HOT WATER SUPPLY UNION (TYPICAL) IMG00473 NOTICE Please note that these illustrations are meant to show system piping concept only, the installer is responsible for all equipment and detailing required by local codes.
Installation & Service Manual 5 System piping Figure 5-4 Two Temperature - Single Unit 180° HOT WATER SUPPLY 140° HOT WATER SUPPLY THERMOMETER (TYPICAL) COLD WATER SUPPLY FLOW CHECK VALVE (TYPICAL) SYSTEM CIRCULATOR (TYPICAL) MIXING VALVE LOW TEMPERATURE BUILDING RETURN EXPANSION TANK BALL VALVE (TYPICAL) HIGH TEMPERATURE BUILDING RETURN UNION (TYPICAL) IMG00474 NOTICE 38 Please note that these illustrations are meant to show system piping concept only, the installer is responsible for all eq
Installation & Service Manual 6 Gas connections Connecting gas supply piping 1. Install ground joint union for servicing, when required. 2. On Models 126-065 -- 286-125 install a manual shutoff valve in the gas supply piping outside water heater jacket when required by local codes or utility requirements. 4. Support piping with hangers, not by the water heater or its accessories. WARNING 3. In Canada – When using manual main shutoff valves, it must be identified by the installer.
Installation & Service Manual 6 Gas connections WARNING WARNING Failure to apply pipe sealing compound as detailed in this manual can result in severe personal injury, death, or substantial property damage. Shield water heaters are typically shipped ready to fire on natural gas. Check the water heater rating plate to determine which fuel the water heater is set for. In order to operate on LP gas contact the factory, an orifice MUST BE installed or a gas valve adjustment MUST BE made.
Installation & Service Manual 6 Gas connections (continued) Table 6A Natural Gas Pipe Size Chart Capacity of Schedule 40 Metallic Pipe in Cubic Feet of Natural Gas Per Hour (based on .60 specific gravity, 0.30" w.c.
Installation & Service Manual 6 Gas connections 17. Check burner performance by cycling the system while you observe burner response. The burner should ignite promptly. Flame pattern should be stable. Turn system off and allow burner to cool, then cycle burner again to ensure proper ignition and flame characteristics. Figure 6-4 Inlet Gas Supply Check - Models 126-065 -- 286-125 Gas pressure The gas pressure must remain between 4 inches w.c. (natural), 8 inches w.c. (LP) minimum and 14 inches w.c.
Installation & Service Manual 7 Field wiring WARNING ELECTRICAL SHOCK HAZARD – For your safety, turn off electrical power supply before making any electrical connections to avoid possible electric shock hazard. Failure to do so can cause severe personal injury or death. Wiring must be N.E.C. Class 1. NOTICE If original wiring as supplied with the water heater must be replaced, use only type 105°C wire or equivalent.
Installation & Service Manual 7 Field wiring 44 LOW WATER CUTOFF BUILDING MANAGMENT SYSTEM ALARM BELL IMG00552 Figure 7-3 Low Voltage Field Wiring Connections
Installation & Service Manual 7 Field wiring (continued) Figure 7-4 Control Inputs/Outputs LOUVER PROVING SWITCH INPUTS LOW VOLTAGE CONNECTION BOARD LOW WATER CUTOFF ENABLE SWITCH TANK SENSOR INLET TEMPERATURE SENSOR OUTLET TEMPERATURE / HIGH LIMIT SENSOR FLUE GAS SENSOR BLOCKED AIR PRESSURE SWITCH FLAME SENSOR BLOCKED DRAIN SWITCH CONTROL BOARD DOOR TEMPERATURE SWITCH IMG00484 DISPLAY PANEL LOW VOLTAGE CONNECTION BOARD ALARM BELL OUTPUTS RUN TIME CONTACTS LOUVER RELAY WHR PUMP IGNITOR
Installation & Service Manual 8 Condensate disposal Condensate drain 1. This water heater is a high efficiency appliance that produces condensate. 2. Slope condensate tubing down and away from the water heater into a drain or condensate neutralizing filter. Condensate from the Shield water heater will be slightly acidic (typically with a pH from 3 to 5). Install a neutralizing filter if required by local codes. A Neutralizer Kit is available from the factory (KIT3087).
Installation & Service Manual 9 Start-up Chlorine concentration less than 200 ppm WARNING 1. Do not fill the water heater or operate with water containing chlorine in excess of 200 ppm. 2. Filling with chlorinated fresh water should be acceptable since drinking water chlorine levels are much lower. 3. Do not use the water heater to directly heat swimming pool or spa water. Propane water heaters only – Your propane supplier mixes an odorant with the propane to make its presence detectable.
Installation & Service Manual 9 Start-up Start the water heater Check flame and combustion 1. Read and follow the Operating instructions in FIG.’s 9-2 and 9-3, pages 49 and 50. 1. Shut the water heater down by pressing the UP button for five (5) seconds. If water heater does not start correctly 1. Check for loose connections, blown fuse or service switch off. 2. Locate the flue sensor in the vent connection. Remove the flue sensor and grommet from the unit.
Installation & Service Manual 9 Start-up (continued) Figure 9-2 Operating Instructions - Models 126-065 -- 286-125 49
Installation & Service Manual 9 Start-up Figure 9-3 Operating Instructions - Models 401-125 -- 501-125 50
Installation & Service Manual 10 Operating information General How the water heater operates The Shield water heater combines an advanced stainless steel heat exchanger, electronic control module, and tank that allows fully condensing operation. The blower pulls in air and pushes flue products out of the heat exchanger and flue piping. The control module regulates blower speed to control the water heater firing rate.
Installation & Service Manual 10 Operating information Water heater temperature regulation Adjustable control parameters Operating temperature (target) Date and time The electronic control module senses water temperature in the tank and regulates water heater ignition and firing rate to achieve a target temperature. The target temperature can be set between 60°F and 185°F. The control uses an internal clock for the night setback feature and for logging of events.
Installation & Service Manual 10 Operating information (continued) Table 10B Temperature Parameter Settings Code p01 Manual Reset High Limit Set Point 210 32 210 p02 Night Setback Set Point 0 0 90 p03 Maximum Tank Set Point 125 32 190 p04 HW Pump Delay 0:30 -- HW Temp 125 0:00 0:40:00 60 185 Installer adjustable parameters To access the Installer Adjustable Parameter Menu, press and hold the ENTER and DOWN buttons simultaneously for five (5) seconds.
Installation & Service Manual 10 Operating information Shield control module Use the control panel (FIG. 10-1) to set temperatures, operating conditions, and monitor water heater operation.
Installation & Service Manual 11 Maintenance Maintenance and annual startup Table 11A Service and Maintenance Schedules Service technician Owner maintenance (see the following pages for instructions) General: • Address reported problems • Inspect interior; clean and vacuum if necessary; • Clean condensate trap and fill with fresh water Daily • Check water heater area ANNUAL START-UP • Check for leaks (water, gas, flue, condensate) • Verify flue and air lines in good condition and sealed tight • Che
Installation & Service Manual 11 Maintenance WARNING Follow the service and maintenance procedures given throughout this manual and in component literature shipped with the water heater. Failure to perform the service and maintenance could result in damage to the water heater or system. Failure to follow the directions in this manual and component literature could result in severe personal injury, death, or substantial property damage.
Installation & Service Manual 11 Maintenance (continued) Check expansion tank 1. Expansion tanks provide space for water to move in and out as the water expands due to temperature increase or contracts as the water cools. Tanks must be approved for potable water systems. See Section 5 - System Piping for suggested best location of expansion tanks. Check water heater relief valve 2. After following the warning directions, if the relief valve weeps or will not seat properly, replace the relief valve.
Installation & Service Manual 11 Maintenance Check burner flame Handling ceramic fiber materials 1. Inspect flame through observation window. REMOVAL OF COMBUSTION CHAMBER LINING 2. If the flame is unsatisfactory at either high fire or low fire, turn off water heater and allow water heater to cool down. Remove the burner and clean it thoroughly using a vacuum cleaner or compressed air. Do not use compressed air to clean burner if performed inside a building. 3. Remove the burner, reference FIG.
Installation & Service Manual 11 Maintenance (continued) 3. Remove the nuts securing the heat exchanger access cover to the heat exchanger and set aside. 4. Figure 11-3 Rope Gasket - Heat Exchanger Door Remove the heat exchanger access cover, burner, and gas/air arm assembly. ROPE GASKET WARNING The water heater contains ceramic fiber materials. Use care when handling these materials per instructions in this manual. Failure to comply could result in severe personal injury. 5.
Installation & Service Manual 12 Troubleshooting WARNING Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation. Always disconnect power to the water heater before servicing. Failure to comply could result in severe personal injury, death, or substantial property damage. Never jumper (bypass) any device except WARNING for momentary testing as outlined in the Troubleshooting chart.
Installation & Service Manual 12 Troubleshooting (continued) Table 12A Troubleshooting Chart - No Display FAULT CAUSE - No 120 VAC supplied to unit. CORRECTIVE ACTION • Check external line switch, fuse, or breaker. • Check wiring harness connection between display board and main control board. Connect harness at both points. No Display No Burner Operation Unit Does Not Modulate Above 50% - Bad display board. • Replace board. - Bad main control board. • Replace the main control board.
Installation & Service Manual 12 Troubleshooting Checking temperature sensors The water heater temperature sensors (inlet water, outlet water, tank water, and flue) are all resistance type devices. The following tables show the correct values for the sensors at various temperatures. Use an ohmmeter to read the resistance of the sensor at a known temperature. If the resistance of the sensor does not closely match its corresponding table, replace the sensor.
Installation & Service Manual 12 Troubleshooting (continued) Table 12D Troubleshooting Chart - Noisy System FAULT CAUSE CORRECTIVE ACTION - Supply gas problem. Natural gas pressures should be between 4 inches w.c. and • Refer to Section 6 - Gas Connections for detailed 14 inches w.c. LP gas pressures should information concerning the gas supply. be between 8 inches w.c. and 14 inches w.c. Noisy Operation - Gas/air mixture problem.
Installation & Service Manual 12 Troubleshooting Table 12E Troubleshooting Chart - Fault Messages Displayed on Water Heater Interface ERROR CODE DESCRIPTION CORRECTIVE ACTION • Reset control module. E00 Invalid lockout code. • Switch power OFF and ON. • Replace control module. E01 The control module has detected parameter settings that are corrupted. • Replace control module. • Vent/air intake lengths exceed the maximum allowed lengths. Refer to Section 2 - General Venting for proper lengths.
Installation & Service Manual 12 Troubleshooting (continued) Table 12E (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Water Heater Interface ERROR CODE E06 DESCRIPTION CORRECTIVE ACTION • Adjust the set point of the auto reset limit to a higher setting up to a maximum of 200°F. Reference Section 10 - Operating Information for adjusting procedures. • Verify that the system is full of water and that all air has been properly purged from the system.
Installation & Service Manual 12 Troubleshooting Table 12E (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Water Heater Interface ERROR CODE E08 E09 DESCRIPTION Louver proving switch open. • Check wiring to louver proving switch. • Check louver proving switch. The blocked drain switch has detected excessive condensate build up inside the unit. • Check condensate tube from unit to floor drain for proper installation and obstructions.
Installation & Service Manual 12 Troubleshooting (continued) Table 12E (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Water Heater Interface ERROR CODE DESCRIPTION CORRECTIVE ACTION The flue temperature has exceeded 250°F. • Inspect the heat exchanger. Reference page 58 of this manual for the procedure on how to clean the flue side of the heat exchanger. b05 The flue temperature has exceeded 240°F. • Inspect the flue sensor and associated wiring.
Installation & Service Manual 12 Troubleshooting Table 12E (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Water Heater Interface ERROR CODE DESCRIPTION E21 (will require a manual reset once the condition One or both of the outlet sensors has has been corrected. Press opened or shorted. the RESET button on the display to reset.) CORRECTIVE ACTION • Check the sensor and its associated wiring. Repair or replace the sensor or wiring if damaged.
Installation & Service Manual 12 Troubleshooting (continued) Table 12E (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Water Heater Interface ERROR CODE DESCRIPTION CORRECTIVE ACTION • Check 120 vac supply to the transformer. b06 120 vac input to the main control board has dropped below 80 vac. • Check wiring connections at the low voltage terminal strip. • Check the wire size/length to remote devices. • Replace the transformer. • Check 24V.
Installation & Service Manual 12 Troubleshooting Combustion Analysis Procedure 1. Shut the water heater down by pressing the UP button for five (5) seconds. 8. Replace the flue sensor and grommet into the vent connection. 2. Locate the flue sensor in the vent connection. Remove the flue sensor and grommet from the unit. Note: Combustion measurements will be made at this point. 9. Place the Shield water heater back into normal operation. WARNING 3.
Installation & Service Manual 12 Troubleshooting (continued) Gas valve adjustment procedure If adjustment of the gas valve is deemed necessary, use the following procedures: (Note: The procedures below are model specific.) Figure 12-3 Gas Valve Adjustment: Model 401-125 Models 126-065 -- 286-125 Locate the throttle adjustment screw on the side of the venturi valve (FIG. 12-2).
Installation & Service Manual 13 Diagrams Figure 13-1 Ladder Diagram JUNCTION BOX 120VAC NEUTRAL GROUND TERMINAL STRIP 120V SUPPLY "L" L IN TERMINAL STRIP 120V SUPPLY "N" L OUT INTEGRATED CONTROL 1 X1-1 F2 X1-6 DHW PUMP DHW PUMP CONTACTS 2 BLOWER 3.15A 3 F1 X1-2 5A X4-3 JUNCTION BOX DHW PUMP RELAY DHW PUMP RELAY F3 .
ALARM CONTACTS CN1 9 RUN-TIME CONTACTS 7 24V LOUVER COM RELAY ENABLE SWITCH 8 6 4 3 2 1 TANK SENSOR S4 X6-10 X6-14 BL GY X2 X5-4 X5-12 CONNECTION BOARD CN3-2 CN3-1 CN3-3 5 CN2-5 BK X4-14 CN2-4 CN2-3 BK BK X4-7 X4-13 CN2-2 BK X4-6 CN2-6 BK CN2-9 BK CN2-1 CN2-10 CN2-8 BK BK BK CN2-7 BK X4-8 BK GAS VALVE R/BK BDS CN3-4 X5-2 O X5-10 PK X5-11 O/BK S1a GY S1b LWCO 10 APS OUTLET SENSOR X5-6 PK/BK S2 OUTLET SENSOR INLET SENSOR X5-5 W/BK S3a FLUE SENSOR X5-13 PR
Notes 74
Notes 75
Revision Notes: Revision A (ECO #C12258) initial release. Revision B (ECO #C12665) reflects the addition of the CSA Low Lead Content logo. Revision C (ECO #C11814) reflects the addition of Metal Fab and Security Chimney to the manual.
