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Navien NCB700-2S Plus 42K Installation & Operation Manual

Condensing combi boiler
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WARNING
If the information in these instructions is not followed exactly, a fire or explosion may
result, causing property damage or personal injury.
Do not store or use petrol or other flammable vapours and liquids in the vicinity of this or any
–
other appliance.
WHAT TO DO IF YOU SMELL GAS
–
Do not try to light any appliances.
●
Do not touch any electrical switch; do not use any phone in your building.
●
Immediately call the National Gas Emergency Helpline on (Freephone) 0800 111999 or your gas
●
supplier from a neighbour's phone. Follow the instructions received.
Installation and service must be performed by a Gas Safe registered installer, service agency or
–
the gas supplier.
Condensing Combi Boiler
Installation
& Operation
Manual
These appliances are for use with natural gas or LPG.
●
(An LPG conversion kit is included with the boiler.)
Type: B23-C13-C33-C53
●
Gas
Natural Gas
LPG
Keep this manual near this boiler for future reference
whenever maintenance or service is required.
Model
NCB700-2S+/42K
NCB700-3S/54K
NCB700-2S+/42K
NCB700-3S/54K

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Summary of Contents for Navien NCB700-2S Plus 42K

  • Page 1 Condensing Combi Boiler Installation & Operation Manual These appliances are for use with natural gas or LPG. ● (An LPG conversion kit is included with the boiler.) Type: B23-C13-C33-C53 ● Model NCB700-2S+/42K Natural Gas NCB700-3S/54K NCB700-2S+/42K NCB700-3S/54K Keep this manual near this boiler for future reference whenever maintenance or service is required.

  • Page 2: Table Of Contents

    8.4 Connecting the Room Stat or OpenTherm 2.2 Accessories 8.5 Connecting the Outdoor Temperature Sensor 2.3 Technical Data 8.6 OpenTherm® Protocol 2.4 Components 8.7 Connecting the Navien Smart Room Controller 2.5 Dimensions (Optional) 2.6 Operating Modes 2.7 Installation Procedure 9. Installation Check list 2.8 About the NaviCirc...

  • Page 3: 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 4 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 5 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 6 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 7 Pressure Vessels: Directive 2014/68/EU point, e.g. by handing it in at a duly authorised reseller when Navien, manufactures its products using a Quality Assurance purchasing a similar product, or at an authorised collection site system in compliance with Standard EN-ISO 9001:2015.

  • Page 8: About The Boiler

    2. About the Boiler 2.1 Items Included When you open the box, you will find the following items with the boiler. Check the box for each of the following items before installing 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.

  • Page 9: Technical Data

    2.3 Technical Data The following table lists the general specifications for the boiler. Specifications Unit NCB700-2S+/42K NCB700-3S/54K Heat input range 35.0/3.5 35.0/3.5 DHW heat input range 40.6/3.5 52.0/3.5 Heat output range @ 80/60°C 34.0/3.4 34.0/3.4 DHW output range 42.0/3.5 54.0/3.5 Condensing heat output range @ 50/30°C 37.1 37.1...
  • Page 10 Specifications Unit NCB700-2S+/42K NCB700-3S/54K Flue exhaust/Air intake system diameters Coaxial Ø60/100 and Ø80/125 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° Ø60/100 Max.
  • 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

    2.4 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 NCB700-2S+/42K About the Boiler...
  • Page 13 Mixing Chamber Dual Venturi Primary Heat Exchanger Secondary Heat Exchanger Expansion Vessel 3-Way Valve Gas Valve Return Adapter Filter Assembly Pressure Relief Valve Central Heating Supply Central Heating Return DHW Outlet DHW Inlet NCB700-2S+/42K About the Boiler...
  • Page 14 Flue Duct Fan & Motor Ignitor & Flame Rod Front Panel Circulation Pump Condensate Trap NCB700-3S/54K About the Boiler...
  • Page 15 Mixing Chamber Dual Venturi Primary Heat Exchanger Secondary Heat Exchanger Expansion Vessel Gas Valve 3-Way Valve Return Adapter Filter Assembly Pressure Relief Valve Central Heating Supply Central Heating Return DHW Outlet DHW Inlet NCB700-3S/54K 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: About The Navicirc

    2.8 About the NaviCirc The NaviCirc is a circulation device for standard domestic hot water pipes with a recirculation system. It allows domestic hot water pipes and secondary return pipe to connect to the NaviCirc and preheat hot water pipes by circulating hot water through the NaviCirc. This prevents hot water loss and heating time loss.
  • Page 21 2.8.2 Specifications Refer to the following table for product specifications. Items Specifications Water flow rate range 2.0–4.0 LPM Shutoff temperature 35°C Water temperature range 5–85°C Ambient temperature range 0–50°C Max water pressure 10 bar Installation operation Horizontal or Vertical Dimensions (mm) 142.7 x 99.8 x 55.6 Weight (kg) 2.8.3 Installation Requirements...

  • Page 22: Installing The Boiler

    Installing the boiler in a location Access to Utilities without a drain will void the warranty and Navien will not be Water–the installation location should be near where the responsible for water damage that occur as a result. For more ●...
  • Page 23 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, The minimum clearance in front with cupboard door Note...

  • Page 24: 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 centre for easy installation on The boiler is heavy. Always lift the unit with assistance. Be ●...

  • Page 25: Installing The System Piping

    For correct installation, the cold water supply pipe installation must comply with the The primary and secondary heat exchangers of the Navien Water Supply (Water Fittings) Regulations and Scottish Water NCB700 boiler are designed to attain the highest level of Byelaws, together with all other national and/or local regulations heat transfer in a compact design.

  • Page 26: Installing A Domestic Hot Water (Dhw) System

    22°C (number/ml). pr EN ISO 6222 example for the boiler. Navien is not responsible for performance issues of the domestic system by scaling or accumulation of dirt; suitable steps shall be taken by the installer and user to avoid water quality related issues.

  • Page 27: Installation Diagrams For The Navicirc

    4.3 Installation Diagrams for the NaviCirc 4.3.1 Instillation Diagram for Using the NaviCirc With a NCB Combi Boiler When the NaviCirc Is Directly Connected to a Tap The following diagram shows an example of an installation location of the NaviCirc used with a NCB combi boiler and directly connected to a tap.
  • Page 28 When the NaviCirc Is NOT Connected to a Tap The following diagram shows an example of an installation location of the NaviCirc used with a NCB combi boiler and NOT connected to a tap. The components in the dotted lines of the diagram must be installed to operate the NaviCirc. Air Vent NaviCirc Pressure Relief Valve...
  • Page 29 4.3.2 Using the NaviCirc With a Boiler Without a Recirculation Pump The following diagram shows an example of an installation location of the NaviCirc used with a boiler without a recirculation pump. The components in the dotted lines of the diagram must be installed to operate the NaviCirc. Pressure Relief Valve Air Vent Recirculation...

  • Page 30: Installing The Navicirc

    4.4 Installing the NaviCirc 4.4.2 Adjusting the Hot Water Pipes The hot water pipes need to be adjusted to connect water pipes to the NaviCirc. Adjustment methods for the hot water pipes 4.4.1 Choosing the Installation Location may vary depending on the types of the pipes. Install the NaviCirc on the hot water return pipe.
  • Page 31 4.4.3 Installing the Hot Water Return Pipe To preheat water with the NaviCirc, a hot water return pipe should be installed. If there is no hot water return pipe where the NaviCirc should be installed, install one. After installing the hot water return pipe, install the 15 mm X ½”...
  • Page 32 Installing the NaviCirc NOT Connected to a Tap If the wall cannot be drilled, secure the NaviCirc to the wall using the bracket with a double-sided tape and primer. 1. Cover the HOT OUT connection with the ½” stainless cap 1.
  • Page 33 Securing the NaviCirc Using Anchors and Screws CAUTION If the wall can be drilled, secure the NaviCirc to the wall using the three anchors and screws. Attach the bracket to the wall in the following direction. If the bracket is attached to the wall in the wrong direction, Choose the location to secure the NaviCirc, Note the lengths of flexible hoses are not appropriate for being...
  • Page 34 4.4.6 Checking for Water Leaks and Purging the 4.4.8 Installing the Pressure Relief Valve Air From Water Pipes Install a pressure relief valve on the cold water supply pipe. For more information on installation, visit the manufacturer’s After the NaviCirc is installed, check for water leaks on the website at www.caleffi.com and download its installation connections of the NaviCirc and water pipes and purge the air manual.
  • Page 35 max 1 m A. Assembly and disassembly should always be carried out while the system is cold and not in pressure. B. Position: the valve can be installed in any position except upside down. C. Shut-off: the valve on the pipe leading to the boiler should never be shut off in any way.
  • Page 36 The NaviCirc’s malfunction Contact Navien Technical Support. Check if the flexible hoses are excessively bent. If other Noises occur after installation. The flexible hoses may be bent. noises occur, contact Navien Technical Support. Installing the System Piping...

  • Page 37: Connecting The Condensate Drain Line

    The condensate pipework must fall at least 50mm per metre away from the boiler, taking the shortest practical route to the The Navien NCB700 boiler creates condensation when it termination point. operates. This condensation has an acidic pH of 3-5. Follow all...
  • Page 38 External Pipework Where the condensate drain pipe terminates in a purpose- designed soakaway (see BS 6798 or boiler installation manual The use of an externally-run condensate drainage pipe, for soakaway design requirements) any above-ground section terminating at a suitable foul water discharge point or purpose- of condensate drainage pipe should be run and insulated as designed soakaway, may be also considered;...
  • Page 39 Description Description Boiler Boiler Visible air break Visible air break 75 mm trap 75 mm trap Soil and vent stack Sink, basin, bath or shower Invert Open end of condensate drainage pipe direct into gully 25 mm min below grating but above water level; end cut at 45° 450 mm minimum up to three storeys Sink lip Minimum internal diameter 19 mm...
  • Page 40 Description Description Condensate discharge pipe from boiler Boiler Pipe size transition point Visible air break Water/weather proof insulation 75 mm trap 43 mm 90° male/female bend Soil and vent stack External rain water pipe into foul water Invert External air break 450 mm minimum up to three storeys Air gap Minimum internal diameter 19 mm...

  • Page 41: Pipe Dimensions And Water Pressure

    4.6 Pipe Dimensions and Water Pressure 4.8 Filling the System The requirements recommended for the pipe dimensions and Follow the instructions to fill the boiler system. water pressure are as follows: The connection diameter for the domestic cold water inlet ●...

  • Page 42: Testing The Water System

    4.9 Testing the Water System WARNING Ensure that the boiler is full of water before firing the burner. Operating the unit without filling it will damage the boiler. Such damage is not covered by the warranty, and may result in property damage or severe personal injury. Perform a fill test after installing the boiler’s water system to make sure that the system has been installed properly.

  • Page 43: Connecting The Gas Supply

    5. Connecting the Gas Supply To connect the gas supply: WARNING 1. Connect the gas supply pipe 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 44: 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 45 To measure the inlet gas pressure: 5. Loosen the screws indicated in the figure below and connect a manometer to the pressure port. Reset the 1. Shut off the manual gas valve on the gas supply line pipe. manometer to zero before use. Opened Closed Gas Valve...

  • Page 46: Flue System

    6. Flue System 6.1 Flue Terminal Positions WARNING Improper flue of the boiler can result in excessive levels of CAUTION carbon monoxide, which can lead to severe personal injury. Flue should be performed only by a licensed professional. The terminal must be fitted with suitable protection if it ●...
  • Page 47 The minimum distances between the flue exhaust terminal and the building elements must comply with those shown in the following table: Flue outlet positions Window Terminal Position Min. distance (mm) Directly below an opening, air brick, windows, etc. 300* Below gutters, soil pipes or drain pipes 75*** Below eaves 200***...
  • Page 48 A terminal must not be sited under a car port roof. Note ● In certain weather conditions the terminal will emit a plume of steam. If possible avoid positioning the terminal where this ● may cause a nuisance, i.e. positions A, D, G, H, J or M. The flue terminal must be exposed to the external air and the position must allow the free passage of air across it at all times.
  • Page 49 Plume Management The appliance produces a plume of condensate, which can be seen in colder weather. This plume of condensation is harmless, but can be unattractive, particularly in the case of outlets on outside walls. For wall terminals a plume management kit is available as an option. 1000 1200 balcony...

  • Page 50: Flue Installation

    The Navien flue system used is a push fit flue system, ● which does not require screws to be fitted at each flue joint.
  • Page 51 6.2.1 Horizontal Coaxial Removal (Type C 4. Ensure flue weather seal is fitted correctly to ensure a good weathered seal. Then the internal (white) decorative weather seal can be fitted. Standard Removal System Wall 5. Although weather seals can be used, the flue must be installed that prevents lateral movement.
  • Page 52 6.2.2 Vertical Coaxial Removal (Type C Standard Removal System Ø60/100 => Max. length: A+B-(1 x 45°elbow) = 20-1.2=18.8 m Ø80/125 => Max. length: A+B-(1 x 45°elbow) = 68-1.2=66.8 m Ø60/100 => Max. length: A=21 m Ø80/125 => Max. length: A=70 m Pipe Diameter Maximum Equivalent...

  • Page 53: 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 54: Setting The Dip Switches

    7. Setting the DIP Switches 7.2 Front Panel DIP Switches CAUTION Dip Switch (Set of 2) Do not remove the front cover unless the power to the boiler is turned off or disconnected. Failure to do so may The DIP SW on the front panel configures the fuel selection. result in electric shock.

  • Page 55: 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 56: 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 57: Connecting The Switched Live (230 V)

    8.3 Connecting the Switched Live (230 V) 8.5 Connecting the Outdoor Temperature Sensor The boiler is designed to be connected to a switched live. The switched live cables are to be connected to terminals 5 The boiler is designed to be able to function with an outdoor (Switched Live In) and 6 (AC Live Out) of the boiler terminal strip.

  • Page 58: Connecting The Navien Smart Room Controller (Optional)

    Controller (Optional) Instead of using your boiler with a generic room thermostat, you can connect the Navien Smart Room Controller to the boiler and benefit from various additional features and more efficient control of the heating system using a mobile device.

  • Page 59: 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 60: 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 61 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 62: Turning The Boiler On Or Off

    2. Check the gas type. LNG (G20) ● LNG (G25_G27) (not available) ● LPG (G30) ● LPG (G31) ● 3. Select the Heat Demand. Navien Thermostat ● Panel ● Switched Live ● CH Thermostat ● OpenTherm ● 4. DHW Preheat Usage Not usage (Default) ●...

  • Page 63: 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 64: 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 65 1: Supply Temperature 5. Central Htg Control 2: Return Temperature Default: Supply Temperature ● Set the heat demand control type for Navien Thermostat, Panel, Switched Live, CH 6. CH Heat Demand Thermostat and OpenTherm. Default: Navien Thermostat ● Press the Up button (...
  • Page 66 10.6.3 Setting the DHW Operation The graph shows how the set temperature is determined. K-factor values can be set using the front panel. To set the boiler’s DHW operation, press the Menu button ( and then select “3. DHW Operation”. Outdoor Temperature Compensation 4 3.5 3 -10 -15 -20 -25...
  • Page 67 10.6.4 Setting the Schedule Programming DHW Preheat To set the boiler’s schedule programming operation, press the Item Description Menu button ( ), and then select “4. Schedule Programming”. 1. ECO (Preheat OFF) Turn off the DHW Preheat. Set to detect DHW usage for 2.
  • Page 68 10.6.5 Viewing Error History 10.6.6 Viewing Other System Information To view the error history, press the Menu button ( ), and then To view the miscellaneous system information, press the Menu select “5. Error History”. button ( ), and then select “6. EMS Data”. A list of 10 recent errors are displayed on the screen, with the Press the Up button ( ) or the Down button (...

  • Page 69: Accessing Advanced Menu Items

    10.7 Accessing Advanced Menu Items 10.6.7 Setting the Display Options To set the front panel display options, press the Menu button ), and then select “7. Configuration”. 10.7.1 Viewing Service Information To view the service information about the boiler, press the Back button ( ) and the Menu button ( ) simultaneously for...
  • Page 70 10.7.2 Viewing Input and Output Status 10.7.3 Setting the Operation Parameters To view the boiler’s input and output status, press the Back To set the boiler’s operation parameters, press the Back button button ( ) and the Menu button ( ) simultaneously for ) and the Menu button ( ) simultaneously for 3 seconds,...
  • Page 71 Press the Back button ( ) to return to the previous screen or Item Description menu. Set the central heating minimum heat capacity limit. Item Description Setting range: Central heating ● Set the central heating supply minimum capacity (%) – 10.
  • Page 72 10.7.4 Diagnosing the Boiler System Item Description Set the service notification To run a series of test procedures for a system diagnosis, press the Back button ( ) and the Menu button ( according to the operating times. simultaneously for 3 seconds, and then select “4. Test Mode”. Setting range: 300 –...
  • Page 73 10.7.5 Setting the Special Operation Modes Item Description Test the 3 way valve operation. To operate the boiler in special operation modes, press the Back button ( ) and the Menu button ( ) simultaneously for The 3 way valve is turned on ●...

  • Page 74: 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 75: 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 76: 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 77: Routine Servicing

    If hot water will not flow and you suspect that the boiler is frozen, follow these steps: Navien advises on an interim service inspection with a flue gas 1. Press the Power button ( ) on the front panel to turn off analyser.
  • Page 78 Checking all Piping for Leaks WARNING Eliminate all system or boiler leaks. Continual fresh makeup water will reduce boiler life. Minerals can build up in sections, Follow the service and maintenance procedures given ● reducing heat transfer, overheating heat exchanger, and causing throughout this manual and in component literature heat exchanger failure.
  • Page 79 Inspecting the Ignition and Flame Detector Electrodes Checking the CO₂ 1. Remove the ignition and flame detector electrodes from the 1. Check the CO₂ readings at full load and low load. boiler heat exchanger. 2. Check the CO readings and combustion performance 2.
  • Page 80 5. Once the front cover is removed, place it in a safe location to 1. Press the Power button ( ) on the front panel to turn off prevent accidental damage. the boiler. 6. Loosen the five screws holding the front panel and remove the front panel.
  • Page 81 8. Remove the screw connecting the fan motor assembly 11. Remove the rubber packing at the top of the cover and put and the mixing chamber, and then remove the fan motor a Phillips screwdriver into the hole, and then loosen the assembly.
  • Page 82 Navien recommends to use a hose. confirm that all components are correctly assembled, fixed ● and supported. Check that manufacturer’s max. flue lengths If the water pressure of the hose is too high, water ●...
  • Page 83 Start SET BOILER TO MAXIMUM RATE In accordance with boiler instructions, set boiler to operate at maximum rate (full load combustion to stabilise. Do not insert analyser probe during this Note period to avoid possible “flooding” of sensor. CARRY OUT FLUE INTEGRITY CHECK USING ANALYSER Insert analyser probe into air inlet test point and allow readings to stabilise.
  • Page 84 From previous page VERIFY FLUE INTEGRITY Analyser readings indicate that combustion products and inlet air > 20.6% < 0.2% < = less than or > 20.6% equal to > = greater than or < 0.2% equal to CHECK CO AND COMBUSTION RATIO AT MAX. RATE TURN OFF APPLIANCE AND CALL With boiler still set at maximum gas rate, insert analyser probe into ATAG TECHNICAL HELPLINE FOR...

  • Page 85: Appendices

    12. Appendices 12.1 Gas Conversion Procedure: 1. Turn off both gas and water supply to the boiler. This boiler is configured for Natural Gas at the factory. If conversion to Propane Gas is required, use the conversion kit 2. Unfasten the 2 latches (at the top) and remove 2 screws (at supplied with the boiler.
  • Page 86 7. Remove the front panel assembly. 9. Loosen the hex nut at location A - the connection above the gas valve where it connects to the pipe. See Figure 3 for reference. Once the hex nut is loose, carefully separate the pipe from the gas valve.
  • Page 87 Attempting to alter or measure the gas valve outlet ● pressure could result in damage to the valve, causing Gas Orifice potential severe personal injury or substantial property damage. Navien NCB700 boilers are shipped ready to fire O-ring natural gas only. Packing Gas Orifice Packing Figure 5-2.
  • Page 88 Replace the old Orifice piece with the new part for use with LP 14. Turn on the gas and water supply to the boiler. gas. Ensure that the Orifice is properly seated inside the port 15. Measure and adjust the gas/air ratio. before proceeding to the next step.
  • Page 89 c. Fully open several hot water fixtures and set the boiler d. After Gas Setup Wizard is done, operate at 1-stage MIN to operate, and proceed Gas Setup Wizard. mode. For proceeding Gas Setup Wizard for gas type For operation mode selection, refer to “10.7.5 Note Note selection, refer to “10.3 Start-Up Wizard”...

  • Page 90: Wiring Diagram

    12.2 Wiring Diagram BLDC FAN Valve Outdoor Sensor 8 6 4 2 7 5 3 1 DHW_INPUT CN12 5 4 4 CN14 PUMP WAV V/V 3WAY-Valve CN11 Dual Ventury MIX V/V (NCB700) PIN1 Recirculation Pump(NCB700) CN10 CN13 ADOPTOR Dip s/w 2 3 4 2 3 4 6 7 8...

  • Page 91: Ladder Diagram

    12.3 Ladder Diagram LIVE NEUTRAL 240 VAC FILTER Relay 1 Igniter Relay 2 Circulation Pump Relay 3 3WAY DC15V Transformer BLDC-FAN Primary Speed Control NCB500/700 Combi Secondary Series Only Water Adjustment AC130 Valve Mixing DC30V Valve Trans DC24V DC 9V DC12V Flow Control Flow Control...

  • Page 92: Outdoor Temperature Sensor (Optional)

    12.4 Outdoor Temperature Sensor (Optional) The boiler is designed to be able to function with an outdoor temperature sensor (10kΩ @ 25°C). Connect the sensor cables to the terminals 3 and 4 of the boiler terminal strip. For more information on the boiler terminal strip, refer to “8.5 Connecting the Outdoor Temperature Sensor”...
  • Page 93 Benchmark Commissioning & Warranty Validation Service Record It is a requirement that the boiler is installed and commissioned to the manufacturer’s instructions and the data fields on the commissioning checklist completed in full. To instigate the boiler warranty the boiler needs to be registered with the manufacturer within one month of the installation.
  • Page 94 GAS BOILER SYSTEM COMMISSIONING CHECKLIST & WARRANTY VALIDATION RECORD Address: Boiler make and model: Boiler serial number: Commissioned by (PRINT NAME): Gas Safe registration number: Company name: Telephone number: Company email: Company address: Commissioning date: Heating and hot water system complies with the appropriate Building Regulations? Optional: Building Regulations Notification Number (if applicable): Time, temperature control and boiler interlock provided for central heating and hot water Boiler Plus requirements (tick the appropriate box(s))
  • Page 95 SERVICE & INTERIM BOILER WORK RECORD It is recommended that your boiler and heating system are regularly serviced and maintained, in line with manufacturers’ instructions, and that the appropriate service / interim work record is completed. Service provider When completing a service record (as below), please ensure you have carried out the service as described in the manufacturers’ instructions. Always use the manufacturers specified spare parts.
  • Page 96 SERVICE & INTERIM BOILER WORK RECORD It is recommended that your boiler and heating system are regularly serviced and maintained, in line with manufacturers’ instructions, and that the appropriate service / interim work record is completed. Service provider When completing a service record (as below), please ensure you have carried out the service as described in the manufacturers’ instructions. Always use the manufacturers specified spare parts.
  • Page 97 Memo...
  • Page 98 Memo...
  • Page 100 Serial number ● Date purchased ● Installation location and type ● Error code, if any appears on the front panel display ● Version: 1.2 (July, 2022) Navien LTD Building 2, Guildford Business Park, Guildford, GU2 8XH TEL 0844 332 2323 www.navien.co.uk...

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