Citadel CTD 1000L Installation, Operation And Maintenance Manual
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Citadel CTD 1000L Installation, Operation And Maintenance Manual

399-1000 mbh hot water boiler indoor/outdoor
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INSTALLATION, OPERATION, AND
MAINTENANCE MANUAL
399-1000 MBH Hot Water Boiler Indoor/Outdoor
Model:
Installation Date:
Heating Contractor:
Address:
U.S. Boiler Company, LLC
Boiler Models
CTD 400
CTD 500
CTD 650
CTD 800
CTD 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: 111959-01
Save this manual for future reference.
 WARNING
WARNING
 DANGER
DANGER
www.usboiler.net
Rev. 0, 4/23

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Summary of Contents for Citadel CTD 1000L

  • Page 1 • If you cannot reach your gas supplier, call the fire department. CTD 500 CTD 650 Installation and service must be performed by a qualified installer, service agency or the gas CTD 800 supplier. CTD 1000L Model: Serial Number: Installation Date: System Type: Heating Contractor: Phone/Email: Address: U.S.

  • Page 2: Table Of Contents

    Factory Test and Inspections Disclaimers and Local Codes III. Product Rating, Specifications, and Dimensional Data Unpacking and Inspection IV. Unpacking The Citadel Check Equipment Installation and Operation Manual V. Citadel Boiler Component Identification General VI. Pre-Installation and Mounting Appliance Mounting Outdoor Installation Citadel 400-1000L Stacking Clearances...
  • Page 3 XII. Electrical Power Requirements Appliance Wiring Routing Field Connections System and Circulation Pump Wiring Check System Setup XIII. System Start-up Start the Citadel Combustion Air/Fuel Adjustment Field Conversion of Gas Type Pump Control Check Thermostat Operation Adjust Supply Water Temperature Testing of Controls and Safety Devices General Maintenance XIV. Service and Maintenance...

  • 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 boilers are condensing, high-efficiency, gas-fired, hot water boilers designed for space heating systems or indirect domestic water heating, where supply water temperature does not exceed 190°F. These boilers 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 8 " 8 " 43" 2 " 2 " 8 " 4 " 2 " 4 " 4 " 8 " 8 " 8 " 4 " Front View Rear View 10" Figure 1: Citadel 400-500 Dimensions CTD 400-1000L I&O Manual...
  • Page 8 8 " 4 " 43" 2 " 8 " 2 " 4 " 26 2 " 4 " 4 " 8 " 8 " 4 " 8 " Front View 10" Back View Figure 2: Citadel 650-1000L Dimensions CTD 400-1000L I&O Manual...

  • Page 9: Unpacking The Citadel

    Please read the instructions contained in this manual carefully as they provide important information Rear intake cover regarding the safe installation, use and servicing of this appliance. Figure 3: Citadel 400-1000L with Outdoor Trim CTD 400-1000L I&O Manual...

  • Page 10: Citadel Boiler Component Identification

    V. Citadel Boiler 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 Boiler Component Identification (continued) Figure 4: Component Identification CTD 400-1000L I&O Manual...

  • Page 12: Pre-Installation And Mounting

    VI. Pre-Installation and Mounting A. General  WARNING WARNING  1. Installation must conform to the requirements of the authority having jurisdiction or, in the absence Apply supplied silicone lubricant to the gasket of such requirements, to the National Fuel Gas inside the vent connector.

  • Page 13: Appliance Mounting

    C. Outdoor Installation Adhesives used to fasten building products and 1. The outdoor model of the Citadel is intended for other similar products installation only in warm climates. Above 32°F Excessive dust and dirt (0°C).

  • Page 14: Citadel 400-1000L Stacking

    D. Citadel 400-1000L Stacking a. Follow all previous instructions for mounting the bottom appliance. 1. The Citadel 400-1000L models may be installed in a stacked configuation. b. Use the included screws to secure the braces as shown in Figure 5.

  • Page 15: Clearances

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

  • Page 16: General Venting Guidelines

    8% from the air inlet portion when pressurized to 2. The Citadel is listed as a direct vent appliance but operating conditions in a neutral pressure room. can also be used with indoor air for combustion.

  • 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

    Ensure that the CPVC 90° Elbow is the first elbow used in the vent system as it exits the boiler. F. Venting for Outdoor Installation 1. The outdoor Citadel ships from the factory with an outdoor venting kit. Kits use DuraVent FasNSeal Boot Tee stainless steel vent pieces.

  • 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 VII. Venting (continued) c. When an air supply duct is used to supply b. Natural gas and propane installation code specifies combustion air, its discharge opening shall be venting systems and air supply for appliances. Air located where there is no possibility of cold air supply shall be provided when either an appliance affecting steam/water lines or other temperature or a combination of appliances has a total input...

  • Page 32: Removing Existing Appliance

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

  • 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) B. Condensate Neutralizer Installation NOTICE NOTICE 1. Some jurisdictions may require that the condensate be neutralized before being disposed of. Follow local Flue gas condensate is corrosive. Route condensate codes pertaining to condensate disposal. drain line in a manner such that any condensate leakage will not cause property damage.

  • Page 36: Hydronic Piping

    IX. Hydronic Piping Citadel boilers are designed to operate in a closed loop pressurized system. Minimum pressure in the boiler must  WARNING WARNING  be 14.5 psi (100 kpa). Proper operation requires a piping system that can provide sufficient water flow through the Failure to properly pipe appliance may result in boiler and meet the water quality requirements.
  • Page 37 IX. Hydronic Piping (continued) Flow Water Outlet 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 38: Standard Piping Components

    IX. Hydronic Piping (continued) C. Standard Piping Components  DANGER DANGER  1. Pressure Relief Valve (Required) a. The pressure relief valve must be installed with Scald Hazard. Pressure relief valve discharge shall spindle in vertical position. Installation of the be piped in such a way to prevent or eliminate pressure relief valve must comply with ASME potential burn risk.

  • Page 39: Water Quality

     WARNING WARNING  of the heat exchanger causing subsequent overheating The Citadel is not designed for the heating of swimming and eventual failure. pool water. Scale can form from high water hardness and slow water 6. Before connecting the appliance, insure the system velocities.

  • Page 40: Oxygen Contamination

    IX. Hydronic Piping (continued) E. Oxygen Contamination b. Eliminate and/or repair fittings which allow 1. Continuous addition of make-up water will oxygen absorption. constantly add oxygen to the system and lead c. Use of non-permeable materials in the distribution to corrosion. Black oxide sludge (magnetite, system.

  • Page 41: Temperature Rise And Heat Exchanger Head Loss

    IX. Hydronic 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 operate within the recomended range shown in Table 24.

  • Page 42: Water Piping Diagrams

    X. Water Piping Diagrams Figure 16: Single Boiler, Primary/Secondary Piping System Pump Air Vent To System Expansion Tank Purge Valve Make Up Water From System Pressure Reducing Valve Check Valve Isolation Valve Y-Strainer Boiler Pump No more than 12 inches or 4 pipe diameters At least 18"...
  • Page 43 X. Water Piping Diagrams (continued) Figure 17: Multiple Boiler, Primary/Secondary with Common Header Piping System Pump To System Air Vent Purge Valve Make Up Water From System Pressure Reducing Valve Expansion Tank Check Valve Y-Strainer Boiler Pump No more than 12 inches or 4 pipe diameters At least 18"...
  • Page 44 X. Water Piping Diagrams (continued) Figure 18: Single Boiler with Indirect Domestic Water Heater From System Expansion Tank System Pump Air Vent Purge Valve To System Y-Strainer Boiler Pump Make Up Water Flow Switch Pressure Reducing Valve (factory supplied) DHW Pump Hot Water Check Valve Cold Water...

  • Page 45: Gas Piping

    XI. Gas Piping 12. Purge all air from gas lines. A. Guidelines and Requirements 13. Install manual shutoff valve in accordance with All installation must conform to the National Fuel Gas state and local requirements. Code ANSI Z223.1/NFPA54, and/or local codes. In Can- 14.
  • Page 46 XI. Gas Piping (continued) Maximum capacity of schedule 40 black pipe in CFH* Table 25:  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

    Older or non-lock-up type regulators may result in nuisance lockouts on gas pressure drops or spikes. The Citadel and all other appliances must be firing at maximum capacity to properly measure the inlet gas pressure.

  • 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 Header Sensor to the terminals labeled  WARNING WARNING  "Header Sensor" on the low voltage PCB. Appliance must be electrically grounded as re- a. Avoid placing the senor near potential sources of quired by National Electrical Code ANSI/NFPA electrical noise such as transformers, power lines, 70-latest edition.
  • Page 50 XII. Electrical (continued) Figure 22: Low Voltage Connections PCB CTD 400-1000L I&O Manual...
  • Page 51 COMBUSTION AIR DAMPER AND PROVING SWITCH ARE REQUIRED IF USING ROOM AIR FOR COMBUSTION WITH MOTORIZED DAMPER(S) OR LOUVER(S). ENERGY MANAGEMENT SYSTEM WIRING CAN BE DONE WITH RJ45 PLUGS OR USING SCREW TERMINALS A, B AND C LABELED 'EMS (DELTA ONLY)'. Figure 23: Citadel 400-1000L Wire Schematic CTD 400-1000L I&O Manual...
  • Page 52 Pump L Pump N System Pump LWCO P3-12 L2-1 L2-3 P3-2 24V Transformer Figure 24: Citadel 400-1000L Wire Diagram 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...
  • 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

    Each Citadel Series appliance is tested at the are within the limits given in Table 28. factory and adjustments to the air fuel mixture d.
  • 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 Boiler Ratings III. Product Rating, Specifications, and Dimensional Data Table 2: Citadel Boiler Specifications Table 3: Appliance Connection Sizes IV. Unpacking The Citadel V. Citadel Boiler Component Identification Table 4: Corrosive Combustion Air Contaminants VI. Pre-Installation and Mounting Table 5: Citadel 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...

  • 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: Citadel 650-1000L Dimensions Figure 3: Citadel 400-1000L with Outdoor Trim IV. Unpacking The Citadel Figure 4: Component Identification V. Citadel Boiler Component Identification Figure 5: Citadel 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...

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

    APPENDIX C: Default Light-off and Modulation Rates CTD 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

    APPENDIX D: Gas Valve and Pressure Switch Tubing Schematics CTD 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 CTD 400-1000L I&O Manual PROPERTY OF...
  • Page 69 LIMITED WARRANTY FOR CITADEL COMMERCIAL CONDENSING BOILERS Stainless Steel Heat Exchangers and Parts/Accessories Subject to the terms and conditions set forth below, U.S. Boiler Company, Lancaster, Pennsylvania hereby extends the following limited warranties to the original owner of a commercial grade water boiler or U.S. Boiler Company supplied parts and/or accessories manufactured and shipped on or after June 1, 2019: One Year Limited Warranty On Commercial Boilers and Parts / Accessories Supplied by U.S.
  • 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:

Ctd 400Ctd 500Ctd 650Ctd 800

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