Navien NCB300-28K Installation & Operation Manual Download Page 1

Page: 1 / 82

Navien LTD

Building 2, Guildford Business Park, Guildford, GU2 8XH

TEL 0844 332 2323 www.navien.co.uk

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

Condensing Combi Boiler

Installation & Operation

Manual

Version: 1.0(August, 2022)

Summary of Contents for NCB300-28K

Page 1: ...r 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 contac...

Page 2: ...tly 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 WHATTO DO...

Page 3: ...Switches 42 7 1 PCB DIP Switches 42 7 2 Front Panel DIP Switches 42 8 Connecting Electrical Supplies 43 8 1 Accessing the Terminal Strips 43 8 2 Connecting the Power Supply Cables 44 8 3 Connecting t...

Page 4: ...bour s phone call your gas provider and follow their instructions If you cannot reach your gas provider call the fire department Do not return to your home until authorised by your gas supplier or the...

Page 5: ...explosion Do not place combustibles such as newspapers or laundry near the boiler or flue system Doing so may result in a fire Do not place or use hair sprays spray paints or any other compressed gas...

Page 6: ...C Very low scald risk CAUTION 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 water supply shut off va...

Page 7: ...ural gas If LPG conversion is required use the conversion kit supplied with the boiler and attach the item matching the LPG GC No included in the kit The Codes of good practice and regulations refer t...

Page 8: ...the Heating and Hotwater Industry Council who manage and promote the Scheme Visit www centralheating co uk for more information Disposal of the Product This product should be handed in at a designated...

Page 9: ...ldren as they can be dangerous When you no longer wish to use the boiler disable any parts that could be potentially hazardous Installation Operation Manual User s Information Manual Boiler mounting t...

Page 10: ...NOx Classification Class 6 Category II2HY203P Type Heating and instantaneous hot water production Heat output adjustment Adjustable over entire Max Min output range Type of heating installation Close...

Page 11: ...valent elbow length 45 60 100 m 1 0 Max horizontal coaxial length 80 125 m 27 Max vertical coaxial length 80 125 m 28 Equivalent elbow length 90 80 125 m 2 2 Equivalent elbow length 45 80 125 m 1 0 Eq...

Page 12: ...dby mode PSB kW 0 003 0 003 0 003 Other items Standby heat loss Pstby kW 0 078 0 078 0 078 Ignition burner power consumption Pign kW 0 0 0 Annual energy consumption QHE GJ 7 5 8 1 8 1 Sound power leve...

Page 13: ...ts The following diagram shows the key components of the boiler Component assembly diagrams and particular parts lists are included in the Appendices Fan Motor Front Panel Ignitor Flame Rod Circulatio...

Page 14: ...About the Boiler 13 Fan Motor Front Panel Ignitor Flame Rod Circulation Pump Gas Valve PCB NCB300 37K NCB300 41K...

Page 15: ...e Venturi Mixing Chamber Primary Heat Exchanger Secondary Heat Exchanger Return Adapter Filter Assembly Gas Valve Central Heating Return Pressure Relief Valve Central Heating Supply DHW Inlet DHW Outl...

Page 16: ...uri Mixing Chamber Primary Heat Exchanger Secondary Heat Exchanger Return Adapter Filter Assembly Gas Valve Central Heating Return Pressure Relief Valve Central Heating Supply DHW Inlet DHW Outlet 3 W...

Page 17: ...aust Air intake 60 100 80 125 B Central heating supply 22 mm C Hot water outlet DHW 15 mm D Gas supply inlet 22 mm E Cold water inlet DHW 15 mm F Central heating return 22 mm OverheadView A 197 5 mm 2...

Page 18: ...operate the central heating mode 1 Press the Menu button to access the CH temperature setting mode 2 Select a heating temperature setpoint higher than current heating temperature When the boiler dete...

Page 19: ...s the central heating temperature range by k factor setting value and the applicable outdoor temperature range 20 15 10 5 0 10 15 20 25 5 20 30 40 50 60 50 70 80 90 4 3 5 3 2 5 2 1 5 1 2 0 6 1 0 2 Out...

Page 20: ...ation of the NCB300 boiler in its final location A detailed description is given of the procedure in the sequenced sections below Wall mounting Gas connection Electrical connections Flue gases exhaust...

Page 21: ...ion lines as possible For more information about the water supply refer to 4 2 Installing a Domestic Hot Water DHW System on page 24 Adequate Drainage The boiler produces a significant amount of conde...

Page 22: ...aundry or similar items do not obstruct access to the boiler or its flue system Adequate installation clearances CAUTION Do not install the boiler on carpeting Install the boiler in an area that allow...

Page 23: ...acket When mounted with the mounting bracket the boiler will have a 16 mm clearance from the back of the wall WARNING The boiler is heavy Always lift the unit with assistance Be careful not to drop th...

Page 24: ...underfloor heating component will have to be separated from the central heating appliance by means of a plate exchanger WARNING Tighten the boiler water connections taking care not to damage them Do...

Page 25: ...boiler Cold Water Supply Condensate Pipe Hot Water Supply Bottom View DHW Outlet Adapter Condensate Outlet Water Inlet Adapter Condensate Drain Hose When installing the DHW system follow these guidel...

Page 26: ...he risk of freezing during prolonged very cold spells one of the following methods of terminating condensate drainage pipe should be adopted Internal Pipework Wherever possible the condensate drainage...

Page 27: ...e installation should also be followed When a rain water downpipe is used as the termination NB only permissible if this downpipe passes to a combined foul and rainwater drainage system an air break m...

Page 28: ...k at plug hole 5 Sink or basin with integrated overflow 6 75 mm sink waste trap 75 450 1 7 6 4 2 3 5 Description 1 Boiler 2 Visible air break 3 75 mm trap 4 Soil and vent stack 5 Invert 6 450 mm minim...

Page 29: ...tube and facing away from house 7 Hole depth 400 mm minimum by 300 mm diameter 8 Minimum internal diameter 19 mm fall at least 45 mm per meter 9 Pipe size transition point 10 Minimum internal diameter...

Page 30: ...lation the inlet pressure must be over 0 5 bar For hot water supply to the second floor of a building the minimum pressure required is 1 0 bar The pipe diameter is not determined by the boiler connect...

Page 31: ...rect pressure will vary with each application 3 If the pressure is lower than the minimum pressure set 1 bar by default error code E302 will appear on the display 4 Fill the boiler with more water unt...

Page 32: ...current Gas Safety Installation and Use Regulations in accordance with BS 6891 However the following recommendations must be complied with at the least Before installing the gas pipes check the type o...

Page 33: ...nsed professional only Natural Gas Connection The gas supply must comply to the current Gas Safety Installation and Use Regulations in accordance with BS 6891 The nominal inlet working gas pressure me...

Page 34: ...measure the inlet gas pressure 1 Shut off the manual gas valve on the gas supply line pipe Gas Valve Opened Closed 2 Open a hot water tap The boiler should turn on and the gas in the gas supply line...

Page 35: ...end of the duct passes through must lead to the outside of the home There must be no hazardous materials or obstructions near the duct If the outlet passes through a wall made of combustible material...

Page 36: ...O From a vertical obstruction 300 P From an openable window 600 Q From an adjacent vertical terminal 600 R From an opening in the car port e g door window into the dwelling 1200 S Below a roof window...

Page 37: ...f air across it at all times A terminal must not be sited below 2 m where people have access to such as public footpaths access routes patios etc However If the terminal is fitted less than 2 m above...

Page 38: ...anagement Kit mm 1 Clearance no less than 200 mm from the lowest point of the balcony or overhang 2 1200 mm from an opening in a car port on the same wall i e door or window leading into dwelling 3 Th...

Page 39: ...int The flue system must be adequately supported at regular intervals between brackets of no more than 1 m for horizontal sections and no more than 2 m for vertical sections The fume extraction connec...

Page 40: ...nt as a decorative weather seals 6 2 1 Horizontal Coaxial Removal Type C13 Standard Removal System 80 125 Max length A 27 m 60 100 Max length A 8 m A Wall Extended Removal System 80 125 Max length A B...

Page 41: ...dy 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...

Page 42: ...that follow describe some typical flue configurations CAUTION Minimum Clearance to Metering devices and Relief equipment Maintain a minimum horizontal clearance of 1 22 m from electric meters gas mete...

Page 43: ...nfigures boiler type capacity burner type country and discharge of condensate function 1 2 3 4 5 6 7 8 ON DIP SW1 Switch Function Setting 1 Boiler Type SOLO ON COMBI OFF 2 Reserve 3 4 Capacity 28kW 3...

Page 44: ...t the time of installation Note The NCB300 boiler has an electrical protection degree of IPX4D The electrical connection must be made via a bipolar switch located on the same premises as the boiler Th...

Page 45: ...ether with the seal B 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 is sealed Note The boiler must be connected to t...

Page 46: ...ables our modulating range of OpenTherm room controls to be connected without any further modifications 1 2 3 4 5 6 NCB300 OpenTherm Protocol Room Controller 8 3 Connecting the Switched Live 230V The...

Page 47: ...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 devi...

Page 48: ...ngeover check the gas inlet pressure Check that the gas circuit is hermetically sealed Check that the control panel is working correctly Check that it functions normally when the boiler is switched on...

Page 49: ...quired for the boiler s operation Refer to the following table for detailed information b a d f c g e a Outdoor temperature compensation OTC Displayed when the outdoor temperature compensation OTC is...

Page 50: ...y temperatures Refer to the following table for detailed information a b c d e f a Menu button Access to the Main menu screen b Plus button Increases the temperature setting parameter or moves up c Ec...

Page 51: ...ting supply water temperature range is 40 C Absolute MIN to 90 C Absolute MAX The central heating temperature cannot be adjusted when the Outdoor Reset Control is used The central heating temperature...

Page 52: ...boiler will retain your settings during a power outage The DHW temperature cannot be adjusted when the Heat Demand function is set to OpenTherm 10 4 Resetting the Boiler If an error message appears y...

Page 53: ...is selected Item Description 1 ECO Mode Do not DHW Preheat 2 Non ECO Mode Always DHW Preheat 10 6 Accessing Basic Menu Items In the Main Menu screen you can view the boiler s operating conditions conf...

Page 54: ...ton or the Minus button to switch between the information items Press the Info button to return to the previous screen or menu Item Description 0 Supply Temp Heating supply temperature 1 Return Temp B...

Page 55: ...Setting range 0 20 min Default 3 min 6 Freeze protection Set the pump freeze protection temperature Setting range 6 C 10 C Default 10 C Note The system freeze protection temperature is set based on t...

Page 56: ...st procedures Press the ECO button to run a test procedure Note During the test mode the boiler stops combustion Item Description 7 Boiler Pump Delay Set the boiler pump off delay time Setting range 3...

Page 57: ...ting maximum operation mode oPE 3 DHW MAX Set the boiler to run in DHW maximum operation mode Press the Info button to return to the previous screen or menu Item Description 1 Fan Motor Test the fan o...

Page 58: ...2 Low water pressure Auto DHW Circulation E407 DHW Outlet thermistor Open or Short Circuit Alarm Controller PCB E515 Abnormal operation Relay feedback PCB Manual E517 Abnormal operation DIP switch set...

Page 59: ...l need to drain either both the central heating side and domestic hot water DHW side or one side only before performing maintenance tasks such as cleaning the adapter filter or to prevent the boiler f...

Page 60: ...s still connected Do not close the gas valve except for routine maintenance as this will limit additional freeze protection If the boiler will not be used for an extended period drain the boiler If th...

Page 61: ...as analyser A full strip down service is recommended at regular intervals or where analyser readings are not within correct safety standards 11 5 1 Interim Service For reasons of safety and economy it...

Page 62: ...cedures given throughout this manual and in component literature shipped with the boiler Failure to perform the service and maintenance could result in damage to the boiler or system Failure to follow...

Page 63: ...t the boiler is serviced annually Servicing must be performed by a competent person in accordance with BS 7967 4 After servicing complete the relevant Service Interval Record section of the Benchmark...

Page 64: ...the gas valve and remove the gas pipe Remove 2 screws here Loosen the hex nut here 1 Press the Power button on the front panel to turn off the boiler 2 Disconnect the power supply to the boiler 3 Tur...

Page 65: ...located at the back of the burner 1 3 2 11 Remove the ten bolts connecting the mixing chamber and the heat exchanger and then remove the mixing chamber burner and the chamber bracket 8 Remove the scre...

Page 66: ...s are in voids The Flue Gas Analyser should be of the correct type as specified by BS 7967 Prior to its use the flue gas analyser should have been maintained and calibrated as specified by the manufac...

Page 67: ...has been visually checked in accordance with the yellow Prior to CO and combustion ratio check box above before proceeding to the Check CO and combustion ratio at maximum rate stage below SET BOILER...

Page 68: ...te at combustion to stabilise CHECK CO AND COMBUSTION RATIO AT MINIMUM RATE gas sampling point Allow readings to stabilise before recording Is CO less than 350ppm and CO CO2 ratio less than 0 0040 BOI...

Page 69: ...responsible for the connection utilization repair or servicing of gas utilization equipment or accessories who is experienced in such work familiar with all precautions required and has complied with...

Page 70: ...bove the gas valve where it is attached to the fan motor assembly Carefully remove the two screws by hand using a Phillips screwdriver and pull the gas inlet pipe away from the fan assembly to access...

Page 71: ...ter or measure the gas valve outlet pressure could result in damage to the valve causing potential severe personal injury or substantial property damage Navien NCB300 boilers are shipped ready to fire...

Page 72: ...boiler before accessing the DIP switches 1 2 O N Figure 6 Set the DIP switches Switch Function Setting 1 2 Fuel Selection G20 LNG 1 OFF 2 OFF G30 LPG 1 ON 2 OFF G31 LPG 1 ON 2 ON Table 1 The DIP Switc...

Page 73: ...several hot water fixtures and set the boiler to operate Measure the CO2 value at low fire If the CO2 value is not within 0 5 of the value listed in Table 2 the gas valve set screw will need to be adj...

Page 74: ...mp Low water pressure S W RETURN_Temp SUPPLY_Temp Dip s w 8pin Dip s w 4pin BURNER HTL OUTLET_Temp 5 4 3 6 2 CN12 HTL INLET_Temp 2 3 4 CN8 1 CN2 P E 1 2 3 4 1 6 7 8 5 1 0 1 1 1 2 9 1 4 1 3 Flow Sensor...

Page 75: ...C12V Fan Hall Sensor BLDC FAN DC15V Vent Separation Detector Supply Thermistor Outlet Thermistor 1 Return Thermistor UART Communication Interface FRONT PANEL Communication Interface FUSE Inlet Thermis...

Page 76: ...perature sensor is on a North or Northeast side of a structure under eaves where the sensor is shielded from direct sunlight Avoid placing sensor in close proximity of heat sources that may affect cor...

Page 77: ...their responsibility to register with the manufacturer within the allotted time period It is essential that the boiler is serviced in line with the manufacturer s recommendations at least annually Th...

Page 78: ...s complete DHW mode gas rate m3 hr or ft3 hr Central heating output left at factory settings Yes No If no what is the maximum central heating output selected KW Dynamic gas inlet pressure mbar Central...

Page 79: ...service in accordance with the manufacturers instructions and BS 7593 It is only acceptable to not have undertaken this if the service engineers attendance visit was in between annual services to att...

Page 80: ...service in accordance with the manufacturers instructions and BS 7593 It is only acceptable to not have undertaken this if the service engineers attendance visit was in between annual services to att...

Page 81: ...Memo...

Page 82: ...Memo...

Search results

Summary of Contents for NCB300-28K

Reviews:

Related manuals for NCB300-28K

Brands by name

Popular brands

Navien NCB300-28K, Installation & Operation Manual

Search results

Summary of Contents for NCB300-28K

Reviews:

Related manuals for NCB300-28K

Brands by name

Popular brands