Navien NCB700-42C Installation & Operation Manual
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Navien NCB700-42C Installation & Operation Manual

Condensing combi boiler
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Condensing Combi Boiler
Installation & Operation
Manual
Getting Service
If your boiler requires service, you have several options for getting service:
Contact an official Technical Assistance Service (TAS) at 0844 332 2323 or go to the website
●
(www.navien.co.uk).
For warranty service, always contact an official Technical Assistance Service (TAS) first.
Contact the technician or professional who installed your boiler.
●
Contact a Gas Safe Registered engineer.
●
When contacting an official Technical Assistance Service (TAS), please have the following information
available:
Model number
●
Serial number
●
Date purchased
●
Installation location and type
●
Error code, if any appears on the front panel display
●
Navien LTD
Building 2, Guildford Business Park, Guildford, GU2 8XH
TEL 0844 332 2323 www.navien.co.uk
Version: 1.1(November, 2021)

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Summary of Contents for Navien NCB700-42C

  • Page 1 Serial number ● Date purchased ● Installation location and type ● Error code, if any appears on the front panel display ● Version: 1.1(November, 2021) Navien LTD Building 2, Guildford Business Park, Guildford, GU2 8XH TEL 0844 332 2323 www.navien.co.uk...
  • Page 2 These appliances are for use with natural gas or LPG. ● (An LPG conversion kit is included with the boiler.) Type: B23-B33-B53-C13-C33-C43-C53-C63-C83 ● Model GC Number NCB700-42C Natural Gas NCB700-54C NCB700-42C NCB700-54C Keep this manual near this boiler for future reference whenever maintenance or service is required.

  • Page 3: Table Of Contents

    2.7 Installation Procedure 8.5 Connecting the Outdoor Temperature Sensor 8.6 OpenTherm® Protocol 3. Installing the Boiler 8.7 Connecting the Navien Smart Room Controller (Optional) 3.1 Choosing an Installation Location 3.2 Mounting the Boiler to the Wall 9. Installation Check list 4.

  • Page 4: Safety Information

    1. Safety Information The following safety symbols are used in this manual. Read and DANGER follow all safety instructions in this manual precisely to avoid unsafe operating conditions, fire, explosion, property damage or personal injury. DANGER Indicates an imminently hazardous situation which, if not avoided, could result in severe injury or death.
  • Page 5 WARNING WARNING This appliance can be used by children aged from 8 years and above and persons with reduced physical, sensory or mental capabilities or lack of experience and knowledge if they have been given supervision or instruction concerning use of the appliance in a safe way and understand the hazards involved.
  • Page 6 CAUTION DANGER Do not turn on the boiler unless ● the water and gas supplies are fully opened. Doing so may damage the boiler. Do not turn on the water if the cold ● BURN water supply shut-off valve is closed. Doing so may damage the boiler.
  • Page 7 The Codes of good practice and regulations refer to the latest versions of the same. Navien ensures that this product contains no harmful The installation must also comply with the following European substances and that no harmful materials have been used in its Standards: manufacture.

  • Page 8: About The Boiler

    If it seems like there is a problem, do not use the boiler. Contact your supplier. Keep the included items out of the reach of children, as they can be dangerous. When you no longer wish to use the boiler, disable any parts that could be potentially hazardous. KD Navien NCB-24LDWE...

  • Page 9: Technical Data

    2.3 Technical Data The following table lists the general specifications for the boiler. Specifications Unit NCB700-42C NCB700-54C Heat input range 34.8/3.5 34.8/3.5 DHW heat input range 40.8/3.5 52.4/3.5 Heat output range @ 80/60°C 34.0/3.4 34.0/3.4 DHW output range 42.0/3.5 42.0/3.5 Condensing heat output range @ 50/30°C...
  • Page 10 Specifications Unit NCB700-42C NCB700-54C Flue exhaust/Air intake system types B23-B33-B53-C13-C33-C43-C53-C63-C83 Flue exhaust/Air intake system diameters Coaxial Ø60/100 and Ø80/125–Dual duct Ø80/80 Max. gas pipe pressure drop Max. horizontal coaxial length Ø60/100 Max. vertical coaxial length Ø60/100 Equivalent elbow length @ 90° Ø60/100 Equivalent elbow length @ 45°...
  • Page 11 Annual fuel consumption Contact details Navien LTD, Building 2, Guildford Business Park, Guildford, GU2 8XH (*) High-temperature regime means 60 °C return temperature at heater inlet and 80 °C feed temperature at heater outlet. (**) Low temperature means for condensing boilers 30 °C, for low-temperature boilers 37 °C and for other heaters 50 °C return temperature (at heater inlet).

  • Page 12: Components

    The following diagram shows the key components of the boiler. Component assembly diagrams and particular parts lists are included in the Appendices. Flue Duct Fan & Motor Ignitor & Flame Rod Front Panel Circulation Pump Condensate Trap NCB700-42C About the Boiler...
  • Page 13 Mixing Chamber Single Venturi Primary Heat Exchanger Secondary Heat Exchanger Air Pipe 3-Way Valve Gas Valve Return Adapter Filter Assembly Pressure Relief Valve Central Heating Supply Central Heating Return DHW Outlet DHW Inlet NCB700-42C About the Boiler...
  • Page 14 Flue Duct Fan & Motor Ignitor & Flame Rod Front Panel Circulation Pump Condensate Trap NCB700-54C About the Boiler...
  • Page 15 Mixing Chamber Single Venturi Primary Heat Exchanger Secondary Heat Exchanger Air Pipe Gas Valve 3-Way Valve Return Adapter Filter Assembly Pressure Relief Valve Central Heating Supply Central Heating Return DHW Outlet DHW Inlet NCB700-54C About the Boiler...

  • Page 16: Dimensions

    2.5 Dimensions The following diagrams show the dimensions of the boiler and the table lists the supply connections. 440 mm Supply Connections Description Diameter Ø60/100, Flue exhaust/Air intake Ø80/125 Central heating supply 22 mm Hot water outlet (DHW) 15 mm Gas supply inlet 22 mm Cold water inlet (DHW)

  • Page 17: Operating Modes

    2.6 Operating Modes Exhaust Air In Air In 2.6.1 Operating in Central Heating Mode To operate the central heating mode: Ignitor Blow Fan 1. Press the Menu button ( ) to access the Main menu and select “2. Central Htg Operation” by pressing the OK button Heat Exchanger Circulation...
  • Page 18 The following table lists the central heating temperature When there is no further DHW demand, the burner ● range by k-factor setting value and the applicable outdoor switches off and the 3-way valve remains in DHW mode temperature range. position during a wait time (5 minutes by default), so that it can work more efficiently and provide more flexibility if the taps are continuously turned on and off.

  • Page 19: Installation Procedure

    2.7 Installation Procedure The flow diagram below provides a step-by-step description of the recommended procedure for clear, easy installation of the NCB700 boiler in its final location. A detailed description is given of the procedure in the sequenced sections below: Wall-mounting »...

  • Page 20: Installing The Boiler

    Installing the boiler in a location Carefully consider the following factors when choosing an without a drain will void the warranty and Navien will not be installation location: responsible for water damage that occur as a result. For more information about condensate drainage, refer to “4.3 Connecting...
  • Page 21 Adequate installation clearances Clearance from: Indoor Installation 250 mm minimum CAUTION Front 600 mm minimum Bottom 200 mm minimum Do not install the boiler on carpeting. Sides 5 mm minimum Install the boiler in an area that allows for service and maintenance access to utility connections, piping, filters, Clean, debris and chemical-free combustion air and traps.

  • Page 22: Mounting The Boiler To The Wall

    3.2 Mounting the Boiler to the Wall WARNING Navien NCB700 boilers come with an upper mounting bracket that is pre-drilled at 400 mm on center for easy installation on The boiler is heavy. Always lift the unit with assistance. Be ●...

  • Page 23: Installing The System Piping

    For correct installation, all the requirements and recommendations described in the The primary and secondary heat exchangers of the Navien Regulation for Heating Installations in Buildings (RITE) must NCB700 boiler are designed to attain the highest level of be complied with, together with all other national and/or local heat transfer in a compact design.

  • Page 24: Installing A Domestic Hot Water (Dhw) System

    Use only pipes, fittings, valves, and other components (such ● as solder), that are approved for use in potable water systems. The Navien NCB700 boiler provides domestic hot water Tighten the connection valves with care to avoid damage. ● continuously when flow is sensed by the flow sensor. This Keep the hot water piping system as short as possible, to ●...

  • Page 25: Pipe Dimensions And Water Pressure

    Before connecting the condensate drain, choose one of the To connect the condensate drain: following disposal options: 1. Connect a drain line to the condensate trap. The condensate trap outlet will allow 21.5 mm. Use only corrosion-resistant material for the drain line, such as PVC or CPVC.

  • Page 26: Pressure Relief Valve

    4.5 Pressure Relief Valve 4.7 Testing the Water System The requirements recommended for the pressure relief valve are as follows: WARNING The pressure relief valve is calibrated to be activated at a ● maximum pressure of 3 bar, and all the pipes and connections Ensure that the boiler is full of water before firing the burner.

  • Page 27: Connecting The Gas Supply

    5. Connecting the Gas Supply To connect the gas supply: WARNING 1. Connect the gas supply pope to the connection located on the underside of the appliance. If a gas type other than the one specified on the boiler ● reference plate is used, it could cause a fire or even an 2.

  • Page 28: Gas Pipe Material

    5.1 Gas Pipe Material 5.3 Measuring the Inlet Gas Pressure WARNING WARNING The boiler must be left running for 10 minutes before The boiler cannot function properly without sufficient inlet checking the gas pressure, to obtain thermal equilibrium. gas pressure. Measuring the inlet gas pressure should be performed by a licensed professional only.
  • Page 29 3. Leave the faucet on until the boiler shuts down due to a lack 5. Loosen the screws indicated in the figure below and of gas supply, and then turn off the hot water faucet. connect a manometer to the pressure port. Reset the manometer to zero before use.

  • Page 30: Flue System

    6. Flue System The minimum distances between the flue exhaust terminal and the building elements must comply with those shown in the WARNING following table: Improper flue of the boiler can result in excessive levels of carbon monoxide, which can lead to severe personal injury. Flue should be performed only by a licensed professional.

  • Page 31: Selecting A Flue System

    For vertical ducts, the outlet must be at least 60 cm Dual Duct System Note ● from any opening. For dual duct system, fit the components as shown in the figure: The dimensions (B, C, D, and E) may be reduced to ●...

  • Page 32: Coaxial Systems

    6.3 Coaxial Systems 6.3.1 Horizontal Coaxial Removal (Type C Standard Removal System B 500 or 1,000 140 min W all Ø60/100 => Max. length: A+B-(1 x 45°elbow) = 20-1 = 19 m Ø80/125 => Max. length: A+B-(1 x 45°elbow) = 68-1 = 67 m Ø60/100 =>...

  • Page 33: Dual Duct Systems

    6.4 Dual Duct Systems 6.3.2 Vertical Coaxial Removal (Type C Standard Removal System 6.4.1 Horizontal Dual Duct Removal (Type C Standard Removal System Ø60/100 => Max. length: A=21 m Ø80/125 => Max. length: A=70 m Extended Removal System Ø80/80 => Max. length: A+B+C-(1 x 90°elbow) = 110-2.2 = 107.8 m Minimum 350 mm Ø60/100 =>...
  • Page 34 6.4.2 Vertical Dual Duct Removal (Type C Extended Removal System Minimum 370 mm Ø80/80 => Max. length: A+B+C+D+E+F-(4 x 90°elbow) = 110-(4 x 2.2) = 101.2 m Pipe Diameter Maximum Equivalent Elbow (mm) Length (m) Length (m) Ø80/80 90° Ø80/80 => Max. length: A+B+C+D-(2 x 45°elbow) = 110-(2 x 1.4) = 107.2 m Pipe Diameter Maximum...

  • Page 35: Measuring Flue Length

    Carefully study the diagrams representing the different types of removal and select the one that best suits the conditions of your installation. To choose the removal accessories required for each installation, see the list of accessories on the NAVIEN price list. Maximum Total Length Pipe Diameter...

  • Page 36: Setting The Dip Switches

    7. Setting the DIP Switches DIP SW2 CAUTION Switch Function Setting Do not remove the front cover unless the power to the Reserve boiler is turned off or disconnected. Failure to do so may result in electric shock. Reserve Reserve The boiler has 2 sets of DIP switches on the main circuit board 5&6 Country...

  • Page 37: Connecting Electrical Supplies

    8. Connecting Electrical Supplies 2. Unfasten the 2 latches (at the top) and remove 2 screws (at the bottom) to remove the front cover and gain access to WARNING the internal components. Improperly connecting the electrical supplies can result in electrical shock and electrocution. Follow all applicable electrical codes of the local authority having jurisdiction.

  • Page 38: Connecting The Power Supply Cables

    8.2 Connecting the Power Supply Cables 4. Insert all these elements in the cable gland and press on the lid “A” until the cable is sufficiently fixed in place and the unit To correctly establish the boiler’s electrical connection, follow is sealed.

  • Page 39: Connecting The Switched Live

    As the Navien NCB700 boiler has a dedicated connector for the Navien Smart Room Controller on the back of the front panel, terminal connection at the terminal block is not required.

  • Page 40: Installation Check List

    After installing the boiler, review the following checklist. Complete the boiler start-up process by carrying out the checks listed in the table below. If you have additional questions or need assistance with installation, contact an official Technical Assistance Service (TAS), or refer to the technical support section of Navien’s website (www.navien.co.uk). Check Value measured...

  • Page 41: Operating The Boiler

    10. Operating the Boiler 10.1 Using the Front Panel The front panel allows you to adjust the temperature and view the operating status or error codes. Remove the protective sheet from the front panel before using it. 10.1.1 Icons and Digital Display The icons and digital display on the front panel provide important information required for the boiler’s operation.
  • Page 42 10.1.2 Buttons Using the buttons on the front panel, you can turn on or off the boiler, monitor the current operation status, and set the values required for the boiler’s operation, such as central heating and DHW supply temperatures. Refer to the following table for detailed information. Menu button Back button Access to the Main menu screen.

  • Page 43: Turning The Boiler On Or Off

    LNG (G20) ● LNG (G25_G27) (not available) ● LPG (G30) ● LPG (G31) ● 3. Select the Heat Demand. Navien Thermostat ● OpenTherm ● CH Thermostat ● Switched Live ● 4. Once the Setup Wizard is finished, a summary of the settings will be displayed.

  • Page 44: Resetting The Boiler

    3. Press the Up button ( ) or the Down button ( ) until the 3. Press the OK button ( ) to select the DHW temperature desired temperature appears on the display. You can adjust ( ). The highlighted section will flash. the temperature while the display is flashing.

  • Page 45: Accessing Basic Menu Items

    10.6 Accessing Basic Menu Items Item Description 8. Inlet Temp Inlet temperature (°C) In the Main Menu screen, you can view the boiler’s operating conditions, configure the central heating and DHW 9. DHW Temp DHW temperature (°C) temperatures, and review error history. Press the Menu button ) to enter the Main Menu screen.
  • Page 46 1: Supply Temperature 5. Central Htg Control 2: Return Temperature Default: Supply Temperature ● Set the heat demand control type for Navien Thermostat, OpenTherm, CH Thermostat 6. CH Heat Demand and Switched Live. Default: Navien Thermostat ● Press the Up button (...
  • Page 47 If you select DHW Schedule, you can select the certain day to 10.6.3 Setting the DHW Operation schedule the central heating modes. To set the boiler’s DHW operation, press the Menu button ( and then select “3. DHW Operation”. Item Description Schedule a command for each 1.
  • Page 48 The schedule settings and checking function cannot Note be used when the Heat Demand function is set to Navien Thermostat. A list of 10 recent errors are displayed on the screen, with the most recent error displayed at the top of the list.
  • Page 49 10.6.6 Viewing Other System Information 10.6.7 Setting the Display Options To view the miscellaneous system information, press the Menu To set the front panel display options, press the Menu button button ( ), and then select “6. EMS Data”. ), and then select “7. Configuration”. Press the Up button ( ) or the Down button ( ) to switch...

  • Page 50: Accessing Advanced Menu Items

    10.7 Accessing Advanced Menu Items 10.7.2 Viewing Input and Output Status To view the boiler’s input and output status, press the Back button ( ) and the Menu button ( ) simultaneously for 10.7.1 Viewing Service Information 3 seconds, and then select “2. Input/Output Status”. To view the service information about the boiler, press the Back button ( ) and the Menu button (...
  • Page 51 10.7.3 Setting the Operation Parameters Press the Back button ( ) to return to the previous screen or menu. To set the boiler’s operation parameters, press the Back button ) and the Menu button ( ) simultaneously for 3 seconds, Item Description and then select “3.
  • Page 52 Item Description Item Description Set the central heating Set the service notification minimum heat capacity limit. according to the operating times. Setting range: Central heating ● minimum capacity (%) – Setting range: 300 – 36500 ● 10. CH Min Limit 20.
  • Page 53 10.7.5 Setting the Special Operation Modes Press the Up button ( ) or the Down button ( ) to switch between the test procedures. Press the OK button ( ) to run a To operate the boiler in special operation modes, press the Back test procedure.

  • Page 54: Error Codes

    10.8 Error Codes When an error code appears on the front panel, refer to the following chart for a definition and possible remedy for the situation. Item Error Code Description Reset E001 Overheating of heat exchanger Manual E003 Ignition failure Manual E004 False flame detection...

  • Page 55: Maintaining The Boiler

    11. Maintaining the Boiler 11.1 Cleaning the Boiler 3. Disconnect the power supply from the boiler. 4. Close the gas valve. CAUTION Make sure the boiler is turned off and the power supply is disconnected before cleaning the boiler. The boiler may remain hot for several minutes after it is turned off.

  • Page 56: Cleaning The Return Adapter Filter

    The water that remains in the plumbing lines CAUTION will drain out. Damage due to freezing is not covered by the Navien limited warranty. If the boiler is connected to a circuit that could freeze, the circuit pipes must be suitably insulated. All pipes installed outdoors must be insulated according to applicable legislation.

  • Page 57: Maintenance Schedules

    11.5 Maintenance Schedules If hot water will not flow and you suspect that the boiler is frozen, follow these steps: 1. Press the Power button ( ) on the front panel to turn off Owner maintenance the boiler. Check boiler area ●...
  • Page 58 Addressing the Reported Problems WARNING Inspect any problems reported by the owner and correct before proceeding. Follow the service and maintenance procedures given ● throughout this manual and in component literature shipped with the boiler. Failure to perform the service Inspecting the Installation Area and maintenance could result in damage to the boiler or system.
  • Page 59 Checking the Ignition Ground Wiring WARNING 1. Check that the ground wire is in good condition and securely attached to the boiler casing. Failure to inspect for the above conditions and have them repaired can result in severe personal injury. 2.

  • Page 60: Appendices

    Gas Orifice (refer to below table) ● This boiler is configured for Natural Gas at the factory. If conversion to Propane Gas is required, use the conversion kit Model supplied with the boiler. NCB700-42C Ø4.4/Ø6.4 Ø3.65/Ø3.95 WARNING NCB700-54C Ø4.8/Ø7.5 Ø4.0/Ø5.65 This conversion kit must be installed by a qualified service Table 1.
  • Page 61 Figure 2-1 and Figure 2-2. Gas Inlet Pipe Gas Valve 7. Remove the front panel assembly. Figure 2-1. NCB700-42C Internal Components Gas Inlet Pipe Gas Valve Figure 2-2. NCB700-52C Internal Components Appendices...
  • Page 62 Navien NCB700 boilers are shipped ready to fire natural gas only. Location B: Remove 4 screws...
  • Page 63 Replace the old Orifice piece with the new part for use with LP gas. Ensure that the Orifice is properly seated inside the port before proceeding to the next step. 11. Replace the gas inlet pipe to its original position and use all screws to secure all connections.
  • Page 64 Gas Type cover. This must be removed first. d. After Gas Setup Wizard is done, operate at 1-stage MIN 8.90% 8.35% mode. NCB700-42C For operation mode selection, refer to “10.7.5 Note 10.40% 10.25% Setting the Special Operation Modes” on 8.90% 8.35%...

  • Page 65: Cleaning The Heat Exchanger

    Gas type [20 mbar] [37 mbar] Model Output Consumption Gas flow Gas flow Load Kcal/h Max. 30,960 36.0 36.8 3.941 0.375 NCB700-42C Min. 2,924 1.479 0.141 Max. 30,960 36.0 36.8 3.941 0.375 NCB700-54C Min. 2,924 1.479 0.141 12.2 Cleaning the Heat Exchanger 2.
  • Page 66 6. Loosen the five screws holding the front panel and remove Remove the five bolts securing the chamber brackets. the front panel. 10. Remove the two screws connecting the ignition transformer to the heat exchanger and then remove the ignition transformer.
  • Page 67 It is important to keep electric parts of the boiler Note ● safe from water. Navien recommends to use a hose. ● If the water pressure of the hose is too high, water ● may splash to other electric parts of the boiler.

  • Page 68: Wiring Diagram

    12.3 Wiring Diagram BLDC FAN Valve Outdoor Sensor 8 6 4 2 CN 5 7 5 3 1 DHW_INPUT CN 12 R/ C 5 4 4 CN 14 PUMP WAV V/V 3WAY -Valve CN 4 CN 11 Dual Ventury MIX V/V (NCB 700 ) CN 4 PIN 1...

  • Page 69: Ladder Diagram

    12.4 Ladder Diagram Appendices...

  • Page 70: Outdoor Temperature Sensor (Optional)

    3. Run the wires into the device body through the grommet opening. 4. Connect the wires to the terminal block. 5. Attach the cap to the body. Navien Outdoor Temperature Sensor Outdoor Temperature Sensor Installation Guidelines Avoid areas with temperature fluctuations by direct sunlight, ●...
  • Page 71 GAS BOILER SYSTEM COMMISSIONING CHECKLIST This Commissioning Checklist is to be completed in full by the competent person who commissioned the boiler as a means of demonstrating compliance with the appropriate Building Regulations and then handed to the customer to keep for future reference. Failuretoinstallandcommissionaccordingtothemanufacturer’sinstructionsandcompletethisBenchmarkCommissioningChecklistwillinvalidatethe warranty.Thisdoesnotaffectthecustomer’sstatutoryrights.
  • Page 72 SERVICE RECORD It is recommended that your heating system is serviced regularly and that the appropriate Service Interval Record is completed. Service Provider BeforecompletingtheappropriateServiceRecordbelow,pleaseensureyouhavecarriedouttheserviceasdescribedinthemanufacturer’sinstructions. Alwaysusethemanufacturer’sspecifiedsparepartwhenreplacingcontrols. SERVICE 01 SERVICE 02 Date: Date: Engineername: Engineername: Companyname: Companyname: TelephoneNo: TelephoneNo: GassaferegisterNo: GassaferegisterNo: Atmax.rate: COppm AND CO ²...
  • Page 73 Memo...
  • Page 74 Memo...
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