U.S. Boiler Company Citadel CTDW 400 Installation, Operation And Maintenance Manual
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U.S. Boiler Company Citadel CTDW 400 Installation, Operation And Maintenance Manual

399-1000 mbh water heater indoor/outdoor
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INSTALLATION, OPERATION, AND
MAINTENANCE MANUAL
399-1000 MBH Water Heater Indoor/Outdoor
Water Heater Models
Model:
Installation Date:
Heating Contractor:
Address:
U.S. Boiler Company, LLC
CTDW 400
CTDW 500
CTDW 650
CTDW 800
CTDW 1000L
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
neighbor's phone. Follow the gas supplier's
instructions.
• If you cannot reach your gas supplier, call
the fire department.
Installation and service must be performed by
a qualified installer, service agency or the gas
supplier.
Serial Number:
System Type:
Phone/Email:
Lancaster, PA
PN: 111959-02
Save this manual for future reference.
 WARNING
WARNING
 DANGER
DANGER
Rev. 0, 4/23
www.usboiler.net

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  • Page 1 CTDW 650 Installation and service must be performed by CTDW 800 a qualified installer, service agency or the gas CTDW 1000L supplier. Model: Serial Number: Installation Date: System Type: Heating Contractor: Phone/Email: Address: U.S. Boiler Company, LLC Lancaster, PA www.usboiler.net...

  • Page 2: Table Of Contents

    Table of Contents I. Hazard Definitions Local Codes II. Read Before Proceeding Warranty Shipment Damage Connecting Gas Supply Line Gas Leakage (If you detect or smell gas...) Maintenance Product Identification Label Factory Test and Inspections Disclaimers and Local Codes III. Product Rating, Specifications, and Dimensional Data Unpacking and Inspection IV. Unpacking The Citadel Check Equipment...
  • Page 3 Table of Contents Common Condensate pump/Sump General Piping Guidelines IX. Water Piping Factory Supplied Relief Valve Package Standard Piping Components Scalding Water Quality Temperature Rise and Heat Exchanger Head Loss Pump Selection X. Water Piping Diagrams Guidelines and Requirements XI. Gas Piping Field Connecting Gas Supply Gas Pressure Switches General.

  • Page 4: Hazard Definitions

    I. Hazard Definitions The following terms are used throughout this manual to bring attention to the presence of hazards of various risk levels, or to important information concerning product life. It is critical all personnel read and adhere to all information contained in DANGER, WARNING, and CAUTIONS. All DANGERS, WARNINGS, and CAUTIONS are for reference and guidance purpose, and, therefore, do not substitute for strict adherence to applicable jurisdictional and professional codes and regulations.

  • Page 5: Gas Leakage (If You Detect Or Smell Gas

    II. Read Before Proceeding (continued) H. Factory Test and Inspections  DANGER DANGER  1. Prior to shipment, final air-fuel adjustments are performed by factory trained service personnel This appliance MUST NOT be installed in any location on each appliance. The factory emissions report where gasoline or flammable vapors are likely to be is posted on the back of the front jacket panel as present or, in an environment that contains corrosive...

  • Page 6: Product Rating, Specifications, And Dimensional Data

    III. Product Rating, Specifications, and Dimensional Data Citadel Water Heaters are condensing, high-efficiency, gas-fired appliances designed for use in direct domestic hot water heating systems where supply water temperature does not exceed 190°F. These water heaters have special coil type stainless steel heat exchangers, constructed, tested and stamped per Section IV of the ASME Boiler and Pressure Vessel Code, which provide maximum heat transfer and simultaneous protection against flue gas product corrosion.
  • Page 7 III. Product Rating, Specifications, and Dimensional Data (continued) LAMPW 400-500 dimensional for manual 4 " 8 " 2 " Side View 8 " 2 " 8 " 2 " 8 " 4 " 8 " 8 " 45" 2 " 2 "...
  • Page 8 III. Product Rating, Specifications, and Dimensional Data (continued) LAMPW 650-1000 dimensional for manual 4 " 8 " 8 " Side View 8 " 8 " 8 " 8 " 4 " 8 " 4 " 45" 2 " 8 " 2 "...

  • Page 9: Unpacking The Citadel

    IV. Unpacking The Citadel  DANGER DANGER  A. Unpacking and Inspection 1. Move appliance to approximate installation Failure to assure the lifting forks are long enough location. to extend at least half way through the base will 2. Remove all crate fasteners. result in the appliance tipping and potentially falling.

  • Page 10: Citadel Water Heater Component Identification

    V. Citadel Water Heater Component Identification Communication Interface (Concert Control) 17. Hot/outlet water temperature sensor Digital User interface for operational control of the Dual element temperature sensor for high limit appliance. control. Main appliance control 18. Cold/Inlet water temperature sensor Receives and processes input signals from safety Used for monitoring the inlet water temperature and switches and sensors to control the appliance.
  • Page 11 V. Citadel Water Heater Component Identification (continued) Figure 4: Component Identification CTDW 400-1000L I&O Manual...

  • Page 12: Pre-Installation And Mounting

    Ensure air intake accelerated component failure. pipe termination is away from areas that may U.S. Boiler Company DOES NOT warrant failures contaminate the combustion air (see Table 4). In caused by mis-sized appliance applications. DO particular, avoid areas near chemical products NOT oversize the appliance to the system.

  • Page 13: Appliance Mounting

    VI. Pre-Installation and Mounting (continued) 5. An elevaded base/pad is required when the floor is Table 4: Corrosive Combustion Air Contaminants not level or in areas where water could accumulate Contaminants to Avoid: around the appliance. The base must be able to Spray cans containing chlorofluorocarbons support the weight of the appliance, water, and all (CFC’s)

  • Page 14: Citadel 400-1000L Stacking

    VI. Pre-Installation and Mounting (continued) D. Citadel 400-1000L Stacking a. Follow all previous instructions for mounting the 1. The CTD 400-1000L models may be installed in a bottom appliance. stacked configuation. b. Use the included screws to secure the brace as a.

  • Page 15: Clearances

    VI. Pre-Installation and Mounting (continued) NOTICE NOTICE E. Clearances This appliance is listed for zero inch clearance 1. The Citadel is listed for 0" clearance to combustible to combustible or noncombustible material, but materials. The clearances for serviceability are installing the appliance with smaller than the found in Table 5.

  • Page 16: General Venting Guidelines

    Common venting with other manufacturers' ap- to the rating of adjoining floor or ceiling. pliances or different U.S. Boiler Company models 5. For flue gas venting, have horizontal runs sloping is prohibited.

  • Page 17: Field Installation

    VII. Venting (continued) C. Field Installation 5. Design the air intake system to allow 3/8” (9.5mm) 1. A factory installed 4" PVC slip or 6" cast aluminum of thermal expansion per 10 ft. (3m) of CPVC/ collar provides a means for air intake connection. PVC pipe.
  • Page 18 VII. Venting (continued) Table 9: Listed Vent Manufacturers and Materials Make Stainless Steel Brand Polypropylene Brand DuraVent FasNSeal PolyPro Heat Fab Saf-T Vent EZ Seal* Z-Flex (Nova Flex Group) Z-Vent Z-DENS Centrotherm InnoFlue SW Rigid Note: Included appliance connection is a 3-in-1 adapter that permits Stainless Steel, Polypropylene, or CPVC. Adapting to Z-DENS requires 4"...

  • Page 19: Room Air For Combustion

    VII. Venting (continued) D. Room Air for Combustion  CAUTION CAUTION  1. If using room air for combustion (intake), install Use all CPVC vent kit components for vent piping the included screen to the intake opening of the near the appliance before transitioning to Schedule appliance.

  • Page 20: General Termination

    VII. Venting (continued) G. General Termination b. When installed on the same wall, locate vent terminal 4 vent pipe diameters above 1. Use only listed vent/combustion air terminals. the combustion air terminal. The snorkle 2. Follow the termination configurations shown configuration can be used when penetrations are in Table 13, and see Table 16 for acceptable at the same hieght.
  • Page 21 VII. Venting (continued) 7. If window and/or air inlet is within 4 ft. (1.2 m) 13. Maintain minimum 24 in. (610 mm) horizontal of an inside corner, maintain at least 6 ft. (1.8 m) spacing between vent terminal and a building spacing between terminal and adjoining wall of corner.
  • Page 22 VII. Venting (continued) Table 14: Direct Vent Terminal Clearances Canadian Installations US Installations Clearance above grade, veranda, 18 in. (46 cm) 12 in (30 cm) porch, deck, or balcony 6 in (15 cm) for appliances ≤ 6 in (15 cm) for appliances 10,000 Btuh (3 kW), 12 in (30 ≤...
  • Page 23 VII. Venting (continued) Table 15: Other than Direct Vent Terminal Clearances Canadian Installations US Installations Clearance above grade, veranda, 18 in (46 cm) 12 in (30 cm) porch, deck, or balcony 6 in (15 cm) for appliances ≤ 10,000 Btuh (3 kW), 12 in (30 4 ft (1.2 m) below or to side of Clearance to window or door that cm) for appliances >...

  • Page 24: Vent And Combustion Air Terminations

    VII. Venting (continued) H. Vent and Combustion Air Terminations NOTICE NOTICE Methods of securing and sealing terminals to 1. Vent Piping the outside wall must not restrain the thermal a. Install fire stops where vent passes through expansion of the vent pipe. floors, ceilings or framed walls.
  • Page 25 VII. Venting (continued) Table 16: Table of Acceptable Terminations Flue Gas Vent Terminations Sidewall Roof Straight Termination Tee Termination Vertical Run Tee Termination Vertical Run 20°-45° Elbow Terminated Downward Velocity Cone Combustion Air Intake Terminations Sidewall Roof Two 90° Elbows Terminated Downward 90°...
  • Page 26 VII. Venting (continued) 6 Pipe Diameters Min. 24 in. Min. Bird Screen From Intake Vent & Intake Bird Screen Vent Vent & Intake 12 in. Min. Above Snow Line 4 Pipe Diameters min. Vent Combustion Combustion Grade/Snow Line 12 in. min. Above Snow Line Figure 9: Horizontal Sidewall Termination Figure 10: Slopped Roof Termination...

  • Page 27: Multiple Appliance Terminations

    VII. Venting (continued) I. Multiple Appliance Terminations  WARNING WARNING The joint between the terminal and the last  1. Vent Piping Terminations piece of pipe must be outside of the building. a. Multiple appliance vent terminations are shown in Figure 12. b. Each individual appliance must have its own The vent for this appliance shall not terminate: vent pipe and vent terminal unless a common 1.
  • Page 28 VII. Venting (continued) 6D Min.  WARNING WARNING  The required spacing between vent and combustion air terminals is to prevent flue gas recirculation. 4D Min. Recirculation of flue gas products into the combustion air supply can cause damage to property or the appliance.

  • Page 29: Polypropylene Venting

    VII. Venting (continued) K. Polypropylene Venting  WARNING WARNING  1. Running Flexible Polypropylene Vent (Liner) Asphyxiation Hazard. Vent systems made by listed PP Through Unused Chimney Chase vent system manufacturers rely on gaskets for proper a. It is the responsibility of the installing contractor sealing.
  • Page 30 VII. Venting (continued) NOTICE NOTICE Pressure drop for flexible polypropylene line is 20 % greater than from rigid pipe. Multiply measured flexible polypropylene liner length by 1.2 to obtain equivalent length. Maximum equivalent vent length of flexible poly- propylene liner is 48 ft. (14.6 m). Installation of a polypropylene vent system should adhere to the vent manufacturer's installation in- structions supplied with the vent system.
  • Page 31 This tions in this manual appliance operates at a positive vent pressure. U.S. Boiler Company takes no responsibility for v. A factory-built chimney used for venting an vent systems that create issues and or affect the appliance shall be certified.

  • Page 32: Removing Existing Appliance

    VII. Venting (continued) M. Removing Existing Appliance NOTICE NOTICE When an existing appliance is removed from a common Please note that the information provided in this venting system, the common venting system is likely to be manual relative to the Canadian Standard is not too large for proper venting of the remaining appliances.

  • Page 33: Special Installation Requirements For Massachusetts

    VII. Venting (continued) N. Special Installation Requirements for Massachusetts 1. For all sidewall horizontally vented gas fueled equipment installed in every dwelling, building or structure used in whole or in part for residential purposes and where the sidewall exhaust vent termination is less than seven (7) feet above grade, the following requirements shall be satisfied: a.

  • Page 34: Condensate Disposal

    VIII. Condensate Disposal A. Condensate trap NOTICE NOTICE 1. The condensate trap is located inside the appliance Do not crimp condensate drain lines or reduce jacket behind the front door panel. drain line inner diameter size, unless adapting to a. The flue gas trap prevents flue gases from a neutralizer kit.

  • Page 35: Common Condensate Pump/Sump

    VIII. Condensate disposal (continued) C. Common Condensate pump/Sump NOTICE NOTICE 1. A common condensate pump/sump may be used. Flue gas condensate is corrosive. Route condensate Run separate piping from each condensate drain drain line in a manner such that any condensate to the sump.

  • Page 36: Factory Supplied Relief Valve Package

    IX. Water Piping (continued) Flow Outlet Water Connection Brass Bushing is installed by factory. Flow switch sensor and o-ring are shipped in a bag inside the jacket. Field Installed Factory Installed Figure 15: Relief Valve Package Assembly B. Factory Supplied Relief Valve Package Table 18: Outlet Piping Parts 1.

  • Page 37: Standard Piping Components

    IX. Water Piping (continued) C. Standard Piping Components  DANGER DANGER  1. Circulation/primary Piping The circulation piping includes both pipelines Scald Hazard. Temperature and pressure relief connecting the appliance to the tank. The pipe valve discharge shall be piped in such a way to diameter for 1 appliance should be sized no smaller prevent or eliminate potential burn risk.

  • Page 38: Scalding

    IX. Water Piping (continued) 8. Isolation Valves (Recommended)  DANGER DANGER  Isolation valves are useful for servicing and stopping water flow in the case of failure. Full port ball valves are required. 9. Mixing Valve/Anti-scald Valve (Recommended) A mixing valve is recommended when storing water at scalding hot temperatures.

  • Page 39: Water Quality

    IX. Water Piping (continued) E. Water Quality Table 20: Water Quality Requirements 1. The water directly in contact with the appliance Quality Parameter Min. Max. must meet the requirements in Table 20. Failure to Water Hardness (ppm) adhere to the water treatment requirements in this manual can cause damage not covered by warranty Total Dissolved Solids (ppm) to the appliance, pumps, or other components in...

  • Page 40: Temperature Rise And Heat Exchanger Head Loss

    IX. Water Piping (continued) F. Temperature Rise and Heat Exchanger Head Loss 1. The Citadel heat exchanger adds pressure drop to the system which must be accounted for in the design of the piping configuration and pump selection. 2. The system should be designed to maintain the operating water flow rate shown in Table 21 while never exceeding the range of absolute flow rates shown in Table 22.

  • Page 41: Pump Selection

    IX. Water Piping (continued) G. Pump Selection A Circulation pump is a required component for complete installation of this appliance. Choosing the appropriate pump is critical for the functionality, safe operation, and longevity of the appliance. Pumps should be sized for each particular installation based on the required flow rate, water hardness, and total pressure drop in the primary loop between the tank and the water heater.

  • Page 42: Water Piping Diagrams

    X. Water Piping Diagrams Figure 16: Single Water Heater, Single Tank Hot Water Return System Circulator Cold Water Supply Recirculation FIlter Expansion Tank Check Valve Mixing Valve Union Hot Water Supply Thermometer T & P Relief Valve Strage Tank Water Heater Circulator Isolation Valve Y-Strainer 1.
  • Page 43 X. Water Piping Diagrams (continued) Figure 17: One Water Heater, One Tank, Two Temperatures Check Valve High Temp Water Supply Thermometer Low Temp Water Supply Recirculation Filter Low Temp High Temp Union Return Return Cold Water Supply Expansion Tank T&P Relief Valve Storage Tank Wate Heater Y-Strainer...
  • Page 44 X. Water Piping Diagrams (continued) Figure 18: Two Water Heaters, Two Tanks System Circulator Check Valve Cold Water Supply How Water Return Mixing Valve Recirculation Filter Hot Water Supply Expansion Tank Thermometer Union T&P Relief Valve Water Heater Circulator Isolation Storage Tank Valve Union Isolation Valve...

  • Page 45: Gas Piping

    XI. Gas Piping A. Guidelines and Requirements 12. Purge all air from gas lines. All installation must conform to the National Fuel Gas 13. Install manual shutoff valve in accordance with Code ANSI Z223.1/NFPA54, and/or local codes. In Can- state and local requirements. ada, installation must conform to the latest edition of 14.
  • Page 46 XI. Gas Piping (continued) Maximum capacity of schedule 40 black pipe in CFH* Table 26:  Natural Gas, Inlet Pressure 14.0 in wc (3.4 kPa)or less; 0.5 in wc (0.12 kPa) Pressure Drop Nominal Inside Length of Pipe (Ft) Pipe Size Diameter (In) (In)

  • Page 47: Gas Pressure Switches

    XI. Gas Piping (continued)  WARNING WARNING  Table 28: Specific Gravity Correction Factors Specific Correction Specific Correction Failure to properly pipe gas supply to appliance may Gravity Factor Gravity Factor result in improper operation and damage. Always 0.60 1.00 0.90 0.82 assure gas piping is absolutely leak free and of the proper size and type for the connected load.

  • Page 48: Electrical

    XII. Electrical A. General.  DANGER DANGER  Install wiring and electrically ground the appliance in Electrical Shock Hazard: Ensure all electrical accordance with authority having jurisdiction or, in the connections are disconnected before attempting absence of such requirements, follow the National installation or service of electrical components or Electrical Code, NFPA 70, and/or Canadian Electrical connections of the appliance or building.

  • Page 49: System And Circulation Pump Wiring

    XII. Electrical (continued) 2. Wire the tank sensor to the terminals labeled "Tank  WARNING WARNING  Sensor" (or "Header Sensor") on the low voltage PCB. Do not use the "DHW Sensor" terminals for the Appliance must be electrically grounded as re- tank sensor as these terminals are used for indirect quired by National Electrical Code ANSI/NFPA water heating with boiler models.
  • Page 50 XII. Electrical (continued) Figure 22: Low Voltage Connections PCB CTDW 400-1000L I&O Manual...
  • Page 51 XII. Electrical (continued) ITEMS SUPPLIED BY INSTALLER SERVICE OVERCURRENT SWITCH PROTECTION/ (OPTIONAL) DISCONNECT POWER SUPPLY 120/60/1 FLAME CONTROL IGNITER SENSOR COMBUSTION PANEL 120 VAC CONNECTIONS PCB GROUND SCREW TRANSFORMER 6.3A SLOW LWCO BLOW FUSE INLET / RETURN SENSOR SYSTEM PUMP GND TO CONTROL DHW PUMP/...
  • Page 52 XII. Electrical (continued) 120VAC/60Hz/1Ph (Line Voltage) 120V 120V Line L Line N Combustion (120V Conn.) B1-3 P3-6 P3-9 B1-1 Ground to control box B1-2 P3-3 Internal, non replaceable via mounting screws 24VDC P2-3 Display Power Supply Wiring Legend P2-1 P2-2 Factory Wire Harness Internal, non replaceable...
  • Page 53 XII. Electrical (continued) LWCO P3-12 L2-1 L2-3 P3-2 24V Transformer 24V Fuse, F3 Size 400: 1.6A Slow Blow 24V Transformer Control Panel Size 500-1000: 2.4A fast acting Ground Screw P8-8 L3-1 L3-2 Igniter Flame Sensor Enable/Disable Enable/ Enable/ P8-12 Control J8-3 J8-2 Disable...

  • Page 54: System Start-Up

    XIII. System Start-up  DANGER DANGER A. Check System Setup  1. Verify that the venting, water piping, gas piping Do not use matches, candles, or other open flame and electrical system are installed properly. Refer ignition sources to check for leaks. to installation instructions contained in this manual.
  • Page 55 XIII. System Start-up(continued) FOR YOUR SAFETY READ BEFORE OPERATING/P OUR VOTRE     SECURITE LISEZ AVANT DE METTRE EN MARCHE WARNING: If you do not follow these instructions exactly, a fire or explosion may result causing property damage, personal injury or loss of life. AVERTISSEMENT: Quiconque ne respecte pas à...

  • Page 56: Combustion Air/Fuel Adjustment

    XIII. System Start-up(continued) 4. Begin commissioning the appliance. Visually inspect e. If high fire O is too low (CO is too high), increase flame via sight glass window. On high fire the flame (decrease CO ) by turning the throttle screw should be stable and mostly blue.

  • Page 57: Field Conversion Of Gas Type

    XIII. System Start-up(continued) c. If low fire O is too high (CO is too low), decrease  WARNING WARNING  (increase CO ) by turning the offset screw clockwise in 1/4 turn increments and check O Make sure that all adjustments at high fire are (or CO ) after each adjustment.

  • Page 58: Pump Control

    XIII. System Start-up(continued) E. Pump Control H. Testing of Controls and Safety Devices Ensure the appropriate pump parameters are selected Prior to placing the appliance in operation, the in the Pumps menu of the Concert control. Refer to installing contractor or other responsible personnel the Concert Control manual for more information.

  • Page 59: Service And Maintenance

    XIV. Service and Maintenance IMPORTANT PRODUCT SAFETY INFORMATION IMPORTANT PRODUCT SAFETY INFORMATION REFRACTORY CERAMIC FIBER PRODUCT REFRACTORY CERAMIC FIBER PRODUCT  WARNING WARNING  The Repair Parts list designates parts that contain refractory ceramic fibers (RCF). RCF has been classified as a possible human carcinogen.

  • Page 60: General Maintenance

    XIV. Service and Maintenance A. General Maintenance  WARNING WARNING  1. Keep the area around the appliance free from combustible materials. (Gasoline and other Read and understand the entire manual before flammable vapors and liquids) attempting installation, start-up, operation, or 2.
  • Page 61 XIV. Service and Maintenance (continued) 2. Igniter Electrode a. Disconnect power to the unit and remove ignition  DANGER DANGER  electrode from the burner door. This appliance uses flammable gas, high voltage b. Visually inspect igniter assembly (ceramic electricity, moving parts, and very hot water under insulators, bracket, and graphite gasket) for high pressure.
  • Page 62 XIV. Service and Maintenance (continued)  DANGER DANGER  Failure to properly secure the burner/blower/gas valve assembly to the heat exchanger could lead to property damage, personal injury or loss of life. Read, understand and follow all the instructions and warnings contained in ALL of the component instruction manuals.

  • Page 63: Restarting After Prolong Shutdown

    XIV. Service and Maintenance (continued) 6 X M10 screws Figure 30: Burner Door Opening D. Restarting after Prolong Shutdown After prolonged shutdown, it is recommended that the steps in "System Start-up" and "Service and Maintenance" in this manual be performed. E. Troubleshooting Refer to the troubleshooting section in the Concert Control manual on how to navigate the Limit String Status screen which shows an active safety limit status...

  • Page 64: Appendix A: Tables

    APPENDIX A: Tables I. Hazard Definitions II. Read Before Proceeding Table 1: Citadel Water Heater Ratings III. Product Rating, Specifications, and Dimensional Data Table 2: Citadel Water Heater Specifications Table 3: Appliance Connection Sizes IV. Unpacking The Citadel V. Citadel Water Heater Component Identification Table 4: Corrosive Combustion Air Contaminants VI. Pre-Installation and Mounting Table 5: CTD 400-1000L Clearances Table 6: Vent and Combustion Air Pipe Diameters and Maximum Lengths VII. Venting Table 7: Equivalent lengths of Vent and Combustion Air Components Table 8: Vent and Combustion Air Equivalent Length Calculation Worksheet Table 9: Listed Vent Manufacturers and Materials Table 10: Stainless Steel Vent Terminations Table 11: Polypropylene Vent Terminations Table 12: Combustion Air and Flue Gas Flow Rates Table 13: Recommended Venting Configurations and Material Options Table 14: Direct Vent Terminal Clearances Table 15: Other than Direct Vent Terminal Clearances Table 16: Table of Acceptable Terminations Table 17: Condensate Neutralizer Kit VIII. Condensate Disposal...

  • Page 65: Appendix B: Figures

    APPENDIX B: Figures I. Hazard Definitions II. Read Before Proceeding Figure 1: Citadel 400-500 Dimensions III. Product Rating, Specifications, and Dimensional Data Figure 2: CTD 650-1000L Dimensions Figure 3: CTD 400-1000L with Outdoor Trim IV. Unpacking The Citadel Figure 4: Component Identification V. Citadel Water Heater Component Identification Figure 5: CTD 400-1000L Stacking Brackets and Display Rotation VI. Pre-Installation and Mounting Figure 6: Side by Side installation Figure 7: Outdoor Venting Installation VII. Venting Figure 8: Vent Terminal Clearances Figure 9: Horizontal Sidewall Termination Figure 11: Flat Roof Vent Terminations Figure 10: Slopped Roof Termination Figure 12: Multiple Appliance Direct Vent Termination Figure 13: Flexible Vent in Masonry Chimney with Separate Combustion Air Intake Figure 14: Condensate Drain Assembly VIII. Condensate Disposal Figure 15: Relief Valve Package Assembly IX. Water Piping Figure 16: Single Water Heater, Single Tank...

  • Page 66: Appendix C: Default Light-Off And Modulation Rates

    APPENDIX C: Default Light-off and Modulation Rates CTDW Model Parameter 650 NG 650 LP 800 NG 800 LP 1000L Max Power MBTU 1000 CH/DHW Max. Modulation Rate (RPM) 8000 7700 5550 5700 6400 6400 6800 Minimum Modulation Rate (RPM) 1600 1300 1050 1100 1200...
  • Page 67 APPENDIX D: Gas Valve and Pressure Switch Tubing Schematics CTDW 400-1000L I&O Manual...
  • Page 68 APPENDIX D: Gas Valve and Pressure Switch Tubing Schematics (continued) REV: DATE: DWN: ENG: APPD: APPD: FIRST USE MATERIAL PART NUMBER TITLE CTDW 400-1000L I&O Manual PROPERTY OF...
  • Page 69 If a claim is made under this warranty during the “No Charge” period from the date of shipment, U.S. Boiler Company will, at its option, repair or replace the heat exchanger (not including labor). If a claim is made under this warranty after the expiration of the “No Charge”...
  • Page 70 U.S. Boiler Company, LLC P.O. Box 3020 Lancaster, PA 17604 1-888-432-8887 www.usboiler.net...

This manual is also suitable for:

Citadel ctdw 500Citadel ctdw 650Citadel ctdw 800Citadel ctdw 1000l

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