Navien NCB-24LDWE Installation & Operation Manual

Condensing combi boiler, natural gas/lpg

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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-B33-B53-C13-C33-C43-C53-C63-C83 Model GC Number NCB-24LDWE 47-709-01 NCB-28LDWE 47-709-02 Natural Gas NCB-34LDWE 47-709-03 NCB-40LDWE 47-709-04...
Page 2: Table Of Contents
8.3 Connecting the Room Stat or OpenTherm 2.6 Operating Modes 8.4 Connecting the Outdoor Temperature Sensor 2.7 Installation Procedure 8.5 OpenTherm® Protocol 8.6 Connecting the Navien Smart Room Controller (Optional) 3. Installing the Boiler 3.1 Choosing an Installation Location 9. Installation Check list 3.2 Mounting the Boiler to the Wall...
Page 3: Safety Information
1. Safety Information The following safety symbols are used in this manual. Read and follow all safety instructions in this manual precisely to avoid DANGER 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 DANGER 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 BURN water supply shut-off valve is closed. Doing so may damage the boiler. To prevent burns: Do not use this boiler for anything other than its intended purpose, as...
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: 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 8: Technical Data
2.3 Technical Data The following table lists the general specifications for the boiler. Specifications Unit NCB-24LDWE NCB-28LDWE NCB-34LDWE NCB-40LDWE Heat input range 20.0/4.2 24.0/4.2 29.0/5.1 34.0/4.0 DHW heat input range 24.0/4.2 28.0/4.2 34.0/5.1 40.0/4.0 Heat output range @ 80/60°C 19.5/3.9 23.4/3.9...
Page 9 Specifications Unit NCB-24LDWE NCB-28LDWE NCB-34LDWE NCB-40LDWE 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 10 Annual fuel consumption Contact details Navien LTD, 3000 Hillswood Drive, Hillswood Business Park, Chertsey, Surrey, KT16 0RS, UK (*) 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 11: 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 Mounting Frame Front Panel Circulation Pump Condensate Trap NCB-24/28/34LDWE About the Boiler...
Page 12 Mixing Chamber Single Venturi Primary Heat Exchanger Air Pipe Secondary Heat Exchanger 3-way Valve Hot Water Heat Exchanger Gas Valve Return Adapter Filter Assembly Pressure Relief Valve Space Heating Supply Space Heating Return DHW Inlet DHW Outlet NCB-24/28/34LDWE About the Boiler...
Page 13 Flue Duct Fan & Motor Ignitor & Flame Rod Mounting Frame Front Panel Circulation Pump Condensate Trap NCB-40LDWE About the Boiler...
Page 14 Mixing Chamber Dual Venturi Primary Heat Exchanger Secondary Heat Exchanger 3-Way Valve Hot Water Heat Exchanger Gas Valve Return Adapter Filter Assembly Pressure Relief Valve Space Heating Supply Space Heating Return DHW Outlet DHW Inlet NCB-40LDWE About the Boiler...
Page 15: Dimensions
15 mm Gas supply inlet 22 mm Cold water inlet (DHW) 15 mm Space heating return 22 mm Overhead View Bottom View 128 mm 200 mm 75 mm 135 mm 75 mm *NCB-24LDWE/28LDWE: 358 mm NCB-34LDWE/40LDWE: 408 mm About the Boiler...
Page 16: Operating Modes
2.6 Operating Modes 2.6.2 Operating According to Outdoor Temperature Conditions The Outdoor Reset Control feature may be used to enhance 2.6.1 Operating in Space Heating Mode energy efficiency while maintaining optimal heating performance. With the Outdoor Reset Control, the space heating To operate the Space heating mode, press the Space heating temperature setting automatically changes according to the button on the front panel and select a heating temperature...
Page 17 2.6.3 Operating in DHW Mode Exhaust To operate in DHW mode, press the DHW button on the front Air In Air In panel and select a DHW temperature setpoint higher than current DHW temperature. 1. When a hot water tap is turned on in the home, the boiler flow meter detects DHW demand, the 3-way valve goes Ignitor Blow Fan...
Page 18: 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 NCB LDWE boiler in its final location. A detailed description is given of the procedure in the sequenced sections below: Wall-mounting »...
Page 19: 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 20 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. Install the boiler in an area that allows for service and Clean, debris and chemical-free combustion air maintenance access to utility connections, piping, filters, Do not install the boiler in areas where dust and debris may and traps.
Page 21: Mounting The Boiler To The Wall
3.2 Mounting the Boiler to the Wall WARNING Navien NCB LDWE 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 standard wall studs.
Page 22: 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 NCB LDWE 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 23: 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 NCB LDWE boiler provides domestic hot water Tighten the connection valves with care to avoid damage. continuously when flow is sensed by the flow sensor. This...
Page 24: 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 13 mm fitting at the bottom of the boiler. Use only corrosion-resistant material for the drain line, such as PVC or CPVC.
Page 25: 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 26: 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 apliance. 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 27: 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 28 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 29: 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 30: 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 25 mm, as long as the flue terminal is extended to 1.
Page 31: 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 32: Dual Duct Systems
6.3.2 Vertical Coaxial Removal (Type C 6.4 Dual Duct Systems 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 33 Extended Removal System 6.4.2 Vertical Dual Duct Removal (Type C 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 34: 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 35: Setting The Dip Switches
7. Setting the DIP Switches 7.2 Front Panel DIP Switches CAUTION Dip Switch (Set of 8) 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 36: Connecting Electrical Supplies
8. Connecting Electrical Supplies Remove the boiler’s front cover by loosening the four screws securing it to the case. WARNING Improperly connecting the electrical supplies can result in electrical shock and electrocution. Follow all applicable electrical codes of the local authority having jurisdiction. Connecting the electrical components should be performed only by a licensed professional.
Page 37: 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 38: Connecting The Room Stat Or Opentherm
As the Navien NCB series boiler has a dedicated connector for the Navien Smart Room Controller on the back of the front 8.4 Connecting the Outdoor Temperature...
Page 39: 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 40: Operating The Boiler
10. Operating the Boiler 10.1 Turning the Boiler On or Off 10.2 Adjusting the Temperature To turn the boiler on or off, press the Power button. 10.2.1 Adjusting the Space Heating Temperature To adjust the heating temperature: 1. Press the Space heating button. The space heating temperature will flash.
Page 41 10.2.2 Adjusting the DHW Temperature 3. Press + (Up) or – (Down) buttons until the desired temperature appears on the display. WARNING Before adjusting the water temperature, read “To prevent burns:” on page 5 carefully. Water above 52°C can cause instant scalding or severe burns.
Page 42: Viewing Basic Information
10.3 Viewing Basic Information Display Description Outdoor reset curve To view information about the boiler, press the ECO button for 2 -: Not in use. seconds. 1: Finned tube baseboard 2: FAN coil 3: Cast iron baseboard 4: Low mass radiant 5: High mass radiant 6: Radiator 7: Custom (set by installer)
Page 43: Setting The Parameters
10.5 Setting the Parameters 4. Press the ECO button and enter your 4-digit password. Use the + (Up) or – (Down) buttons to increase or decrease numbers and the Summer/Winter button to move between You can modify parameter settings for boiler operations, such digits.
Page 44 Configuring the Outdoor Reset Control Mode Setting the Heat Load for the Outdoor Reset Control Mode Display Description Display Description Outdoor Reset heat load types 1: Finned tube baseboard Outdoor Reset enabled 2: FAN coil 3: Cast iron baseboard 4: Low mass radiant 5: High mass radiant Outdoor Reset disabled 6: Radiator...
Page 45 Setting the Boost Interval Time Setting the Lowest Outdoor Temperature Display Description Display Description Lowest outdoor temperature Boost interval time (min) (°C) The boost interval time may be set to prevent interruption in Lowest outdoor temperature space heating while using the Outdoor Reset Control mode, not in use due to changes in heat load conditions.
Page 46 Setting the Min Heat Capacity for Space Heating Setting the Pump Overrun Time Display Description Display Description Space heating min heat Pump overrun time (min) capacity (%) This menu is used to configure the desired space heating The pump overrun time is the duration the circulation pump capacity.
Page 47 Setting the DHW Wait Time Setting the Burner-On Temperature Display Description Display Description DHW wait time (min) Burner-on temperature (°C) The DHW wait time is the duration that the boiler maintains the During space heating, the boiler turns on the burner when DHW supply mode after a DHW demand.
Page 48 Setting the Supply Absolute MIN Temperature Setting the Return Absolute MIN Temperature Display Description Display Description Supply absolute Min set point Return absolute MIN set point (°C) (°C) This menu can be used to change the minimum supply This menu can be used to change the minimum return temperature range in Supply Control mode.
Page 49: Resetting The Boiler
Setting the LCD Back Light Setting a New Password This menu may be used to set the status of LCD back light. Display Description Default: ON Display Description Change password LCD back light maintains minimum brightness. This menu may be used to set a new password to access the parameter setting menu.
Page 50: 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 51: 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. The boiler is designed for indoor installation only. If the boiler is connected to a circuit that could freeze, the circuit pipes must be suitably insulated.
Page 52: Maintenance Schedules
If hot water will not flow and you suspect that the boiler is 11.5 Maintenance Schedules frozen, follow these steps: 1. Press the Power button on the front panel to turn off the Owner maintenance boiler. Check boiler area 2. Close the gas valve. Daily Check pressure / temperature gauge Check flue piping...
Page 53 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 54 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 55: Appendices
Included Items: 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. NCB-24LDWE Ø5.7 Ø4.5 WARNING NCB-28LDWE Ø5.7 Ø4.5...
Page 56 6. Loosen the four screws indicated in the figure. 8. With the internal components exposed, locate the gas inlet pipe and the gas valve in the middle of the unit, as shown in Figure 2-1 and Figure 2-2. Gas Inlet Pipe Gas Valve 7.
Page 57 Attempting to alter or measure the gas valve outlet pressure could result in damage to the valve, causing potential severe personal injury or substantial property damage. Navien NCB LDWE boilers are shipped ready to fire natural gas only. Appendices...
Page 58 Packing Packing Gas Orifice Gas Orifice Packing O-ring Figure 5-1. Exploded View of Gas Pipe Assembly Figure 5-2. Exploded View of Gas Pipe Assembly (NCB-24/28/34LDWE) (NCB-40LDWE) DANGER See Figure 5-2. Inspect the O-ring between the venturi and gas valve inlet adapter whenever they are disassembled. The O-ring must be in good condition and must be installed.
Page 59 Fuel 1 & 2 Model Gas Type Selection G30 (LPG) 1-ON, 2-OFF G31 (LPG) 1-ON, 2-ON 9.27% 8.78% NCB-24LDWE 10.40% 10.00% Table 1. The DIP Switch Setting by Fuel Selection 9.20% 8.65% NCB-28LDWE DANGER 10.42% 10.00% 9.10% When conversion is required, be sure to set the front 8.50%...
Page 60 The set screw is located behind the screw-on Note cover. This must be removed first. Gas type [20 mbar] [37 mbar] Model Load Kcal/h Max. 16,770 19.5 20.0 2.142 0.804 NCB-24LDWE Min. 3,354 0.450 0.169 Max. 20,124 23.4 24.0 2.570 0.964 NCB-28LDWE Min. 3,354 0.450 0.169...
Page 61: Cleaning The Heat Exchanger
12.2 Cleaning the Heat Exchanger 4. Using a Phillips screwdriver, remove four screws (two at the bottom and two at the top) of the front cover assembly to gain access to the internal components. WARNING Before cleaning the heat exchanger, make sure the boiler is off.
Page 62 7. Use a Phillips screwdriver to remove the two screws (four Remove the five bolts securing the chamber brackets. screws for NCB-40LDWE) where gas inlet pipe is attached to the fan motor assembly. Loosen the hex nut located above the gas valve and remove the gas pipe. Remove 2 screws here...
Page 63 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 64: Wiring Diagram
12.3 Wiring Diagram Appendices...
Page 65: Ladder Diagram
12.4 Ladder Diagram Appendices...
Page 66: Outdoor Temperature Sensor (Optional)
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, and where the temperature may not be representative of true outdoor temperature.
Page 67 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. CONTROLS Optimum start control Fitted...
Page 68 SERVICE RECORD It is recommended that your heating system is serviced regularly and that the appropriate Service Interval Record is completed. Service Provider SERVICE 01 SERVICE 02 ² % ² % ² % ² % SERVICE 03 SERVICE 04 ² % ²...
Page 69 Memo...
Page 70 Memo...
Page 71 Memo...
Page 72 Model number Serial number Date purchased Installation location and type Error code, if any appears on the front panel display Version: 1.00 (Jun.17.2016) Navien LTD 3000 Hillswood Drive, Hillswood Business Park, Chertsey, Surrey, KT16 0RS, UK TEL 0844 332 2323 www.navien.co.uk...

This manual is also suitable for:

Ncb-34ldwe Ncb-40ldwe Ncb-28ldwe

Navien NCB-24LDWE Installation & Operation Manual

1 Safety Information

2 About the Boiler

3 Installing the Boiler

4 Installing the System Piping

5 Connecting the Gas Supply

6 Flue System

7 Setting the DIP Switches

8 Connecting Electrical Supplies

9 Installation Check List

10 Operating the Boiler

11 Maintaining the Boiler

12 Appendices