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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.
• Do not touch any electrical switch; do not use any phone in your
building.
• Immediately call your gas supplier from a near by phone.
Follow the gas supplier's instructions.
• If you cannot reach your gas supplier, call the fire department.
-- Installation and service must be performed by a qualified
installer, service agency, or the gas supplier.
Installation & Service
Manual
Models: SNR150-100, SNR200-100,
SNA285-125, SNA400-125, AND
SNA500-125
WARNING
This manual must only be used by a
qualified heating installer / service
technician. Read all instructions in this
manual before installing. Perform steps
in the order given. Failure to comply
could result in severe personal injury,
death, or substantial property damage.
Save this manual for future reference.
SWH-I-S Rev F
TM
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Table of Contents
Troubleshooting
Related Manuals for Shield SNR150-100
Summary of Contents for Shield SNR150-100
- Page 1 SWH-I-S Rev F Installation & Service Manual Models: SNR150-100, SNR200-100, SNA285-125, SNA400-125, AND SNA500-125 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.
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Page 2: Table Of Contents
2. GENERAL VENTING The Shield Control Module ..... . . 54 Direct Venting Options ......15-16 Status Display Screens . -
Page 3: Please Read Before Proceeding
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 indicates an imminently hazardous situation which, if not avoided, will result in death or serious DANGER injury. -
Page 4: The Shield - How It Works
Installation & Service Manual The Shield - How it works... Access cover - front 18. Heat exchanger inlet temperature sensor Provides access to the gas train and heat exchanger. This sensor monitors the inlet water temperature to the heat exchanger. - Page 5 The Shield - How it works... (continued) Models SNR150-100 -- SNA285-125 Front View - Models SNR150-100 -- SNA285-125 Rear View - Models SNR150-100 -- SNA285-125 Left Side (inside unit) -- Models SNR150-100 - Right Side (inside unit) -- Models SNR150-100 - SNA285-125 SNA285-125...
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Page 6: The Shield -- How It Works
Installation & Service Manual The Shield - How it works... Model SNA400-125 Rear View - Model SNA400-125 Right Side (inside unit) - Model SNA400-125 Model SNA500-125 Right Side (inside unit) - Model SNA500-125 Rear View - Model SNA500-125... -
Page 7: Ratings
Maximum allowed working pressure is located on the rating plate. NOTICE Notes: 1. Shield water heaters require special gas venting. Use only the vent materials and methods specified in the Shield Installation and Service Manual. 2. Standard Shield water heaters are equipped to operate from sea level to 4,500 feet only with no adjustments. -
Page 8: Determine Water Heater Location
The ventilating air openings shown in 4. The Shield water heater must be installed so that gas FIG.’s 1-1 and 1-2 are required for this control system components are protected from dripping arrangement. - Page 9 Installation & Service Manual Determine water heater location (continued) Figure 1-1 Closet Installation - Minimum Required Clearances 1" MINIMUM CLEARANCE AROUND HOT WATER For closet installations, CPVC WARNING PIPES AND VENT PIPE material MUST BE used in a closet structure elevated temperatures.
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Page 10: Flooring And Foundation
Dry cleaning/laundry areas and establishments Prevent combustion air contamination Swimming pools Install air inlet piping for the Shield water heater as described in Metal fabrication plants this manual. Do not terminate vent/air in locations that can allow contamination of combustion air. Refer to Table 1A, for... -
Page 11: Using An Existing Vent System To Install A New Water Heater
When using an existing vent system to existing common vent system: install a new water heater: Failure to follow all instructions can result Do not install the Shield water heater into WARNING DANGER in flue gas spillage and carbon monoxide a common vent with any other appliance. -
Page 12: Removing Water Heater From Existing Common Vent . 11 Combustion & Ventilation Air Requirements
Installation & Service Manual Determine water heater location Maintain minimum specified clearances for adequate If air is taken directly from outside the building operation. All installations must allow sufficient space for with no duct, provide two permanent openings to servicing the vent connections, water pipe connections, the equipment room (see FIG. - Page 13 1 Opening Directly Bottom Bottom Bottom from Outdoors, in Opening, in Opening, in Opening, in Opening, in Opening, in Opening, in SNR150-100 (246 cm (246 cm (484 cm (484 cm (968 cm (968 cm (323 cm SNR200-100 (323 cm (323 cm...
- Page 14 Installation & Service Manual Determine water heater location The combustion air supply must be completely free of any Combustion air requirements are based on the latest edition of the National Fuel Gas Code, ANSI Z223.1; in Canada refer flammable vapors that may ignite or chemical fumes which may be corrosive to the appliance.
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Page 15: General Venting
Installation & Service Manual General venting Direct venting options - Sidewall Vent Figure 2-2 Stainless Steel Two-Pipe Sidewall Figure 2-1 PVC/CPVC Two-Pipe Sidewall Termination Termination - See page 23 for more details - See page 22 for more details Figure 2-3 PVC/CPVC Concentric Sidewall Termination - See page 26 for more details... -
Page 16: Direct Venting Options
Installation & Service Manual General venting Direct venting options - Vertical Vent Figure 2-5 Stainless Steel Two-Pipe Figure 2-4 PVC/CPVC Two-Pipe Figure 2-6 PVC/CPVC Concentric Vertical Termination - See page 29 for Vertical Termination - See page 29 for Vertical Termination - See page 31 more details more details for more details... -
Page 17: Venting And Combustion Air
Vent) and the 3" Concentric Vent Kit available from IPEX Use only the materials listed in Table 2A WARNING are both approved for use on the Shield Water Heater. Both for vent pipe, and fittings. Failure to kits are listed to the ULC-S636 standard for use in Canada. -
Page 18: Pvc/Cpvc Air Intake/Vent Connections
Section 305, Table 305.4 or as local codes dictate. Figure 2-10 Near Water Heater Venting Models Figure 2-9 Near Water Heater Venting Models SNA285-125 - SNA500-125 SNR150-100 - SNR200-100 VENT VENT 3" CPVC PIPE INSTALLED IN THE WATER HEATER MUST BE USED FOR VENT CONNECTION 4"... -
Page 19: Air Inlet Pipe Materials
Installation & Service Manual General venting (continued) Air inlet pipe materials: When a sidewall or vertical rooftop combustion air supply system is disconnected for any reason, the air inlet pipe must be The air inlet pipe(s) must be sealed. Choose acceptable resealed to ensure that combustion air will be free of combustion air inlet pipe materials from the following list: contaminants and supplied in proper volume. -
Page 20: Stainless Steel Air Intake/Vent Connections
* = This adapter must be used in addition to the water heater adapter for Saf-T vent pipe as shown in FIG. 3-11, unless approved vent other than standard diameter is used. Consult a Heat Fab representative for questions. The Shield water heater uses model specific combustion air Minimum... -
Page 21: Vent & Air Piping
General venting (continued) Vent, air piping and termination: Table 2D Concentric Vent Kit Equivalent Vent Lengths The Shield water heater vent and air piping can be installed Equivalent Model through the roof or through a sidewall. Follow the procedures Number Vent Length in this manual for the method chosen. -
Page 22: Sidewall Direct Venting
Installation must comply with local NOTICE requirements and with the National Fuel Model Kit Number Vent Size Gas Code, ANSI Z223.1 for U.S. installations or CSA B149.1 for Canadian SNR150-100 -- SNR200-100 KIT30045 3 inch vent installations. SNA285-125 -- SNA500-125 KIT30046 4 inch vent... - Page 23 FROM BOILER VENT PIPE CONNECTION 12" MIN. 12" MIN BIRD SCREEN MODELS SNR150-100 THRU SNA500-125 VENT / AIR Figure 3-1E Alternate SS Venting Arrangement - TERMINATION 12" Typical Stainless Steel Sidewall Termination of Air and MIN. Vent w/Field Supplied Fittings, Utilizing FasNSeal’s 12"...
- Page 24 Installation & Service Manual Sidewall direct venting Prepare wall penetrations Figure 3-2B Alternate Clearance to Gravity Air Inlets Use the factory supplied wall plate as a template to locate w/Field Supplied Fittings the vent and air intake holes and mounting holes. Air pipe penetration: Cut a hole for the air pipe.
- Page 25 Installation Code. 3. Use a sidewall termination plate as a template for correct 3. The air inlet of a Shield water heater is part of a direct vent location of hole centers. connection. It is not classified as a forced air intake with 4.
- Page 26 Figure 3-6 Concentric Sidewall Termination Lochinvar offers optional concentric combustion air and vent pipe termination kits (Factory Kit #CVK3003 for 3" diameter - Models SNR150-100 - SNR200-100 and #CVK3007 for 4" diameter - Models SNA285-125 - SNA500-125). Both combustion air and vent pipes must attach to the termination kit.
- Page 27 Sidewall direct venting (continued) Sidewall termination – optional concentric vent Figure 3-9 Concentric Vent Dimensional Drawing - Figure 3-10 Concentric Vent Dimensional Drawing - Models SNR150-100 -- SNR200-100 / CVK3003 Models SNA285-125 -- SNA500-125 / CVK3007 "A" "B" DIA. "C" DIA.
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Page 28: Sidewall Direct Venting
Installation & Service Manual Sidewall direct venting Sidewall termination – optional concentric vent Figure 3-12 Concentric Vent Sidewall Attachment Note: CVK3003 shown for illustration purposes. Multiventing sidewall terminations DO NOT use field-supplied couplings to CAUTION extend pipes. Airflow restriction will When two (2) or more direct vent appliances are vented near occur and may cause intermittent each other, each appliance must be individually vented (see... -
Page 29: Vertical Direct Venting
Installation & Service Manual Vertical direct venting Vent/air termination – vertical Follow instructions below when Rooftop vent and air inlet terminations WARNING WARNING determining vent location to avoid must terminate in the same pressure possibility of severe personal injury, death zone, unless vertical vent sidewall air is set or substantial property damage. - Page 30 CSA B149.1 Installation Code. 3. Space the air and vent holes to provide the minimum 3. The air inlet of a Shield water heater is part of a direct vent spacing shown in FIG. 4-1A, page 29. connection. It is not classified as a forced air intake with regard to spacing from adjacent water heater vents.
- Page 31 Installation & Service Manual Vertical direct venting (continued) Vertical termination – optional concentric vent Description and usage 2. Cut one (1) hole (5 inch diameter for #CVK3003 Lochinvar offers an optional concentric combustion air and installations or 7 inch diameter for #CVK3007 installations) vent pipe termination kit.
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Page 32: Vertical Direct Venting
Installation & Service Manual Vertical direct venting Vertical termination – optional concentric vent Do not operate the appliance with the rain DO NOT use field-supplied couplings to CAUTION WARNING removed recirculation extend pipes. Airflow restriction will combustion products may occur. Water occur. -
Page 33: Conventional And Sidewall Venting
Conventional and sidewall venting 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. The vent pipe may terminate either vertically (FIG. 5-1) above the roof line in a conventional vent manner or on a sidewall (FIG. -
Page 34: System Piping
Basic steps are listed below along with illustrations on the following pages (FIG.’s 6-2 thru 6-4), which will guide you through the installation of the Shield water heater. 1. BEFORE PROCEEDING WITH THE INSTALLATION, CLOSE THE MAIN WATER SUPPLY VALVE. After... -
Page 35: Water Chemistry
See the *piping illustrations included in this section, Corrosion due to water chemistry generally shows up first in FIG.’s 6-2 thru 6-4 for suggested guidelines in piping the Shield the hot water system because heated water increases the rate of water heater. -
Page 36: Piping Diagrams
Installation & Service Manual System piping Figure 6-2 Single Unit FLOW CHECK VALVE COLD WATER (TYPICAL) SUPPLY EXPANSION TANK BUILDING RETURN HOT WATER SUPPLY SYSTEM CIRCULATOR MIXING VALVE (IF REQUIRED, SEE PG.35) BALL VALVE (TYPICAL) UNION (TYPICAL) - Page 37 Installation & Service Manual System piping (continued) Figure 6-3 Multiple Units COLD WATER SUPPLY FLOW CHECK VALVE (TYPICAL) UNION EXPANSION (TYPICAL) TANK SYSTEM CIRCULATOR BUILDING RETURN HOT WATER SUPPLY BALL VALVE (TYPICAL) MIXING VALVE (IF REQUIRED, SEE PG.35)
- Page 38 Installation & Service Manual System piping Figure 6-4 Two Temperature - Single Unit FLOW CHECK VALVE (TYPICAL) THERMOMETER (TYPICAL) 180° HOT WATER SUPPLY MIXINGVALVE 140° HOT WATER SUPPLY LOW TEMPERATURE BALL VALVE BUILDING RETURN (TYPICAL) COLD WATER SUPPLY EXPANSION TANK UNION (TYPICAL) HIGH TEMPERATURE...
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Page 39: Gas Connections Connecting Gas Supply Piping
4. Support piping with hangers, not by the water heater or its required. accessories. The gas valve and blower will not support 2. On Models SNR150-100 -- SNA285-125 install a manual WARNING the weight of the piping. Do not attempt to shutoff valve in the gas supply piping outside water heater... -
Page 40: Natural Gas
14 inches w.c. maximum. Figure 7-3 Inlet Pipe with Backup Wrench Propane gas: WARNING Shield water heaters are typically shipped ready to fire on natural gas. Check water heater rating plate to determine which fuel the water heater is set for. -
Page 41: Check Inlet Gas Supply
5130 4720 Shield water heaters are typically shipped ready to fire on natural gas. Check the water heater rating plate to WARNING 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. -
Page 42: Gas Pressure
(dynamic) mode. If an in-line regulator is used, it must be a minimum of 10 feet from the Shield water heater. Figure 7-4 Inlet Gas Supply Check - Models SNR150/100 It is very important that the gas line is properly purged by the -- SNA285-125 gas supplier or utility company. -
Page 43: Field Wiring
Installation & Service Manual Field wiring Installation must comply with: ELECTRICAL SHOCK HAZARD – For WARNING your safety, turn off electrical power 1. National Electrical Code and any other national, state, supply before making any electrical provincial, or local codes, or regulations. connections to avoid possible electric shock hazard. - Page 44 Installation & Service Manual Field wiring Figure 8-3 Low Voltage Field Wiring Connections...
- Page 45 Installation & Service Manual Field wiring (continued) Figure 8-4 Control Inputs/Outputs INPUTS LOW VOLTAGE CONNECTION TANK SENSOR BOARD LOW WATER CUTOFF INLET TEMPERATURE SENSOR OUTLET TEMPERATURE / HIGH LIMIT SENSOR FLUE GAS SENSOR BLOCKED AIR INLET PRESSURE SWITCH FLAME SENSOR BLOCKED DRAIN SWITCH CONTROL BOARD DISPLAY PANEL...
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Page 46: Condensate Disposal Condensate Drain
2. Slope condensate tubing down and away from the water increase to 1 inch. heater into a drain or condensate neutralizing filter. Condensate from the Shield water heater will be slightly condensate line must remain acidic (typically with a pH from 3 to 5). -
Page 47: Start-Up
Installation & Service Manual Start-up Chlorine concentration less than 200 ppm Propane water heaters only – Your propane WARNING supplier mixes an odorant with the propane 1. Do not fill the water heater or operate with water to make its presence detectable. In some containing chlorine in excess of 200 ppm. - Page 48 10. Replace the top panel on the unit. again until corrected. Failure to comply 11. Place the Shield water heater back into normal operation. could result in severe personal injury, death, or substantial property damage. You must replace the flue sensor to WARNING prevent flue gas spillage into the room.
- Page 49 Installation & Service Manual Start-up (continued) Figure 10-2 Operating Instructions - Models SNR150-100 -- SNA285-125...
- Page 50 Installation & Service Manual Start-up Figure 10-3 Operating Instructions - Models SNA400-125 -- SNA500-125...
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Page 51: Operating Information
45°F: Modulation • Below 45°F, the internal pump operates constantly. The Shield water heater is capable of modulating its firing • Below 37°F, the burner turns on. • The burner and pump will turn off if water rate from a minimum of 20% to a maximum of 100%. -
Page 52: Water Heater Temperature Regulation
Installation & Service Manual Operating information Water heater temperature regulation Tank Differential Operating temperature (target) Once the tank set point is satisfied, the tank temperature must drop below the set point by this amount before the heater will The electronic control module senses water temperature in fire again. -
Page 53: Sequence Of Operation
Installation & Service Manual Operating information (continued) Sequence of operation OPERATION DISPLAY HTR: Standby 1. When the tank temperature falls below the set point minus the differential, the control will start the burner. TANK: 123.8F(129) 2. The control connects 120 VAC to the blower. The blower does not run at this time. -
Page 54: The Shield Control Module
Installation & Service Manual Operating information Shield control module Use the control panel (FIG. 11-1) to set temperatures, operating conditions, and monitor water heater operation. Figure 11-1 Control Panel • Press once to go into Menu Mode • Press again to exit Menu Mode •... -
Page 55: Status Display Screens
Installation & Service Manual Operating information (continued) Status display screens Status Display Screens By using the Previous/Next ( , ) arrow keys on the electronic control module display panel, you can navigate through the five (5) display screens. Each screen will contain two (2) viewable items. The following is a description of the individual items and what they can display: Screen Display shows:... -
Page 56: Status Display Screens
Installation & Service Manual Operating information Status Display Screens (cont’d) By using the Previous/Next ( , ) arrow keys on the electronic control module display panel, you can navigate through the five (5) display screens. Each screen will contain two (2) viewable items. The following is a description of the individual items and what they can display: Screen Display shows:... -
Page 57: Maintenance Maintenance And Annual Startup
Installation & Service Manual Maintenance Maintenance and annual startup Table 12A 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; Daily • Clean condensate trap and fill with fresh •... -
Page 58: Address Report Problems
Installation & Service Manual Maintenance Follow the service and maintenance procedures given throughout this manual and in component literature WARNING 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. -
Page 59: Flue Vent System And Air Piping
Installation & Service Manual Maintenance (continued) Flue vent system and air piping Safety relief valves should be re-inspected AT WARNING LEAST ONCE EVERY THREE YEARS, by a Visually inspect the entire flue gas venting system and air licensed plumbing contractor or authorized piping for blockage, deterioration or leakage. -
Page 60: Inspect Ignition & Flame Sense Electrodes
Installation & Service Manual Maintenance Inspect ignition and flame sense Figure 12-2 Burner Assembly electrodes 1. Remove the ignition and flame sense electrodes from the water heater heat exchanger access cover. 2. Remove any deposits accumulated on the ignition/flame sense electrode using sandpaper. If the electrodes cannot be cleaned satisfactorily, replace with new ones. -
Page 61: Cleaning Water Heater Heat Exchanger
Oiled bearing circulators • Wear long-sleeved, loose fitting clothing, gloves, and eye protection. 1. The circulator shipped with the Shield water heater is water- lubricated. No oiling is required. Apply enough water to the combustion chamber lining to prevent airborne dust. -
Page 62: Troubleshooting
Installation & Service Manual Troubleshooting Check control module fuses Label all wires prior to disconnection WARNING when servicing controls. Wiring errors ALWAYS check control module fuses before can cause improper and dangerous NOTICE replacing control module or any major operation. Always disconnect power to components (blower, etc.). -
Page 63: Troubleshooting Chart - No Display
Installation & Service Manual Troubleshooting (continued) Table 13A Troubleshooting Chart - No Display FAULT CAUSE CORRECTIVE ACTION - No 120 VAC supplied to unit. • Check external line switch, fuse, or breaker. • Check wiring harness connection between display board main control board. -
Page 64: Checking Temperature Sensors
Installation & Service Manual 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. -
Page 65: Troubleshooting Chart - Noisy System
Installation & Service Manual Troubleshooting (continued) Table 13D 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 7 - Gas Connections for detailed 14 inches w.c. -
Page 66: Troubleshooting Chart - Fault Messages Displayed
Installation & Service Manual Troubleshooting Table 13E Troubleshooting Chart - Fault Messages Displayed on Water Heater Interface FAULT DESCRIPTION CORRECTIVE ACTION • Check supply voltage for proper polarity. Flame Sequence • Check external wiring for voltage feedback. (will require a manual The flame detector circuit is seeing a flame •... - Page 67 • Inspect the burner. Reference page 60 of this manual for removal and cleaning procedures. Replace if necessary. • Replace the main control board. • Ensure gas valve switch is ON (Models SNR150-100 GV/Relay and SNA285-125). Fail • Check wiring harness connection at the gas valve and...
- Page 68 • Verify that the water heater is piped properly into the heating system. Refer to Section 6 - System Piping for the proper piping methods for the Shield water Manual Reset heater. High Limit •...
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Page 69: Corrective Action
Installation & Service Manual Troubleshooting (continued) Table 13E (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Water Heater Interface FAULT DESCRIPTION CORRECTIVE ACTION The actual fan RPM is 30% higher than • Vent/air intake lengths exceed the maximum allowed what is being called for. - Page 70 • Verify that the water heater is piped properly into the parameters for the water heater. heating system. Refer to Section 6 - System Piping for the proper piping methods for the Shield water heater. • Check for 120 VAC to the water heater pump motor on a call for heat.
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Page 71: Troubleshooting Chart - Fault Messages Displayed
• Verify that the water heater is piped properly into the heating system. Refer to Section 6 - System Piping for the proper piping methods for the Shield water heater. Service Blk While the unit is in Service Mode, the outlet •... -
Page 72: Combustion Analysis Procedure
Obstruction • Check for obstructions at the vent/air intake terminals. • Refer to Section 7 - Gas Connections for the proper gas supply for the Shield water heater. Gas Supply Pressure • Refer to page 60 of this manual for burner removal and cleaning procedures. -
Page 73: Gas Valve Adjustment Procedure
(Note: The procedures below are model specific.) Models SNR150-100 -- SNA285-125 Locate the throttle adjustment screw on the side of the venturi valve (FIG. 13-2). Using a screwdriver, turn the screw a 1/4 turn clockwise to decrease CO... -
Page 74: Diagrams
Installation & Service Manual Diagrams Figure 14-1 Ladder Diagram 120VAC JUNCTION BOX NEUTRAL GROUND TERMINAL STRIP TERMINAL STRIP 120V SUPPLY "L" 120V SUPPLY "N" PUMP RELAY PUMP "L" PUMP "N" PUMP TERMINAL TERMINAL STRIP STRIP INTEGRATED CONTROL PUMP RELAY COIL X1-6 X1-3 DHW PUMP... -
Page 75: Wiring Diagram
Installation & Service Manual Diagrams (continued) Figure 14-2 Wiring Diagram LOW VOLTAGE WARNING DISPLAY 120 VAC DISCONNECT POWER HIGH VOLTAGE BEFORE SERVICING INTEGRATED CONTROL JUNCTION BOX DEPICTS OPTIONAL ITEMS INTERFACE CONNECTION BOARD PUMP X1-5 PUMP RELAY CN2-9 X6-10 EXTERNAL LIMITS CN2-3 X6-5 X1-3... - Page 76 Revision Notes: Revision A (ECO #C02299) initial release. Revision B (ECO #C02870) reflects the addition of a mixing valve to the piping diagrams (FIG.’s 6-2 and 6-3, pgs. 32 - 34). Revision C (ECO #C02738) reflects edits made to the Gas Valve Adjustment Procedure for Model SNA400-125 on page 69.
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