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CAUTION

Do not remove the front cover unless the power to the

boiler is turned off or disconnected.

Failure to do so may

result in electric shock.

The boiler has 2 sets of DIP switches on the main circuit board

(PCB) and 1 sets of DIP switches on the front panel. DIP switches

are used to control the functionality of the boiler. Set the DIP

switches appropriately, based on the installation environment.

7.1 PCB DIP Switches

Dip Switch 1 (Set of 8)

The DIP SW 1 on the circuit board configures operation status,

boiler model/capacity, burner type, and country.

2 3 4

5 6 7

Dip SW 1

Dip SW 2

1 2 3 4

Switch Function Setting

1 & 2

Operation

Status

Normal Operation

1-OFF, 2-OFF

20/23/28

LHWE

MIN

1-OFF, 2-ON

33LHWE

1-stage MIN

20/23/28

LHWE

Heating MAX

1-ON, 2-ON

33LHWE

Heating

2-stage MAX

3 & 4

Capacity

20LHWE

3-OFF, 4-OFF

23LHWE

3-ON, 4-OFF

28LHWE

3-OFF, 4-ON

33LHWE

3-ON, 4-ON

Burner

Type

Bekaert

5-OFF

6 & 7

Country

Europe

6-OFF, 7-OFF

Boiler

Type

Combi

8-OFF

System

8-ON

Dip Switch 2 (Set of 4)

The DIP SW 2 on the circuit board configures the external DHW

tank.

Switch Function

Setting

DHW Tank

Used

1-ON

Unused

1-OFF

7.2 Front Panel DIP Switches

Dip Switch (Set of 8)

The DIP SW on the front panel configures the fuel selection,

source of the heat demand, and temperature control standard.

1 2

4 5 6

7 8

Switch Function

Setting

1 & 2

Fuel

Selection

G20 (LNG)

1-OFF, 2-OFF

G25, G27(LNG)

1-OFF, 2-ON

G30 (LPG)

1-ON, 2-OFF

G31 (LPG)

1-ON, 2-ON

4 & 5

Heat

Demand

Panel

4-OFF, 5-OFF

OpenTherm

Remote Control

4-ON, 5-OFF

Room Stat

4-OFF, 5-ON

230 VAC Room

Stat (System boiler

only)

4-ON, 5-ON

Temperature

Control

Standard

Supply Water

6-OFF

Return Water

6-ON

7. Setting the DIP Switches

34 Setting the DIP Switches

Содержание NCB-20LHWE

Страница 1: ...ht 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 nei...

Страница 2: ...DIP Switches 34 7 2 Front Panel DIP Switches 34 8 Connecting Electrical Supplies 35 8 1 Accessing the Terminal Blocks 35 8 2 Connecting the Power Supply Cables 36 8 3 Setting the DIP Switches and Para...

Страница 3: ...r 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 fire department Do n...

Страница 4: ...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...

Страница 5: ...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...

Страница 6: ...If LPG conversion is required use the conversion kit supplied with the boiler The Codes of good practice and regulations refer to the latest versions of the same The installation must also comply wit...

Страница 7: ...s that could be potentially hazardous Installation Operation Manual User s Information Manual Boiler mounting plate Boiler registration Installers Club Card ErP Label Wall mounting bracket Tapping scr...

Страница 8: ...ciency rate SEDBUK 2009 89 0 89 1 89 0 89 1 NOx Classification Class 5 Category II2H3P Type Heating and instantaneous hot water production Heat output adjustment Adjustable over entire Max Min output...

Страница 9: ...Equivalent length of adapter 60 100 80 125 m 0 5 Max dual duct length 80 80 m 110 Equivalent elbow length 90 80 m 2 2 Equivalent elbow length 45 80 m 1 4 Hydraulic connection diameter Central Heating...

Страница 10: ...e regime 1 97 8 98 1 97 7 98 0 Auxiliary electricity consumption At full load elmax kW 0 036 0 045 0 048 0 045 At part load elmin kW 0 014 0 015 0 016 0 016 In standby mode PSB kW 0 003 0 003 0 003 0...

Страница 11: ...components of the boiler Component assembly diagrams and particular parts lists are included in the Appendices Fan Motor Front Panel Flue Duct Ignitor Flame Rod Circulation Pump Condensate Trap Mount...

Страница 12: ...enturi Mixing Chamber APS Primary Heat Exchanger Secondary Heat Exchanger Return Adapter Filter Assembly Space Heating Return Pressure Relief Valve Space Heating Supply Gas supply inlet Gas Valve Air...

Страница 13: ...NCB 33LHWE Fan Motor Front Panel Flue Duct Ignitor Flame Rod Circulation Pump Condensate Trap Mounting Frame PCB 13 About the Boiler...

Страница 14: ...Venturi Mixing Chamber Primary Heat Exchanger Secondary Heat Exchanger Return Adapter Filter Assembly APS Space Heating Return Pressure Relief Valve Space Heating Supply Gas supply inlet Gas Valve 14...

Страница 15: ...mm 440mm Supply Connections Description Diameter A Flue exhaust Air intake 60 100 80 125 B Space heating supply 22 mm C Gas supply inlet 22 mm D Space heating return 22 mm Overhead View 90mm 157 mm 18...

Страница 16: ...and the applicable outdoor temperature ranges Note To connect the outdoor temperature sensor to the boiler carefully follow the connection instructions provided in the 13 5 Outdoor Temperature Sensor...

Страница 17: ...location A detailed description is given of the procedure in the sequenced sections below Wall mounting Gas connection Electrical connections DIP switch settings Final check Water and condensate pipe...

Страница 18: ...inage The boiler produces a significant amount of condensate during operation This condensate must be removed from the boiler and suitably treated if national legislation so requires The boiler should...

Страница 19: ...l or other flammables are used or stored Ensure that combustible materials are stored away from the boiler and that hanging laundry or similar items do not obstruct access to the boiler or its flue sy...

Страница 20: ...ting bracket and hang the boiler on the bracket 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...

Страница 21: ...ubes could reduce boiler efficiency and cause it to malfunction Any pipes exposed to the elements or which could freeze in winter must be insulated with suitable insulating material CAUTION Failure to...

Страница 22: ...sate into a laundry tub as the alkali in laundry detergent will neutralise the acid in the condensate However other suitable waste drain locations may be used according to the local legislation CAUTIO...

Страница 23: ...ance between the boiler and the laundry tub or when the bottom of the boiler is lower than the top of the laundry tub 2 Place the free end of the drain line into an appropriate drain 3 If you are usin...

Страница 24: ...lling the boiler pipes the pump will run for 5 minutes and 20 seconds The boiler will operate normally after performing an air purge 4 6 Testing the Water System WARNING Ensure that the boiler is full...

Страница 25: ...e complied with at the least Before installing the gas pipes check the type of gas is compatible with the boiler Check that the gas meter in the home can measure the rate of gas supply required The ga...

Страница 26: ...t It must also be thoroughly secured to prevent it from tipping over which could cause an explosion If the boiler is used with propane a gas regulator suitable for this type of gas must be installed T...

Страница 27: ...s pressure reading on the manometer The gas pressure must fall within the ranges specified on page 8 3 Leave the faucet on until the boiler shuts down due to a lack of gas supply and then turn off the...

Страница 28: ...rectly joined using sealing gaskets Ensure that there are no leaks from any part of the removal circuit Switch off the boiler and wait for the pipes to cool down before cleaning the gas removal and ai...

Страница 29: ...gs 6 2 Selecting a Flue System WARNING The gas removal ducts must not be in contact with or near flammable materials and they must not pass through any structures or walls of buildings made of such ma...

Страница 30: ...140 min Wall Extended Removal System 80 125 Max length A B 1 x 90 elbow 68 2 2 65 8 m 60 100 Max length A B 1 x 90 elbow 20 1 3 18 7 m B A 80 125 Max length A B 1 x 45 elbow 68 1 67 m 60 100 Max leng...

Страница 31: ...ax length A B 1 x 45 elbow 70 1 69 m 60 100 Max length A B 1 x 45 elbow 21 1 20 m A B Minimum 350 mm Pipe Diameter mm Maximum Length m Elbow Equivalent Length m 60 100 21 45 1 0 80 125 70 6 4 Dual Duc...

Страница 32: ...2 m D C A B Minimum 370 mm Pipe Diameter mm Maximum Length m Elbow Equivalent Length m 80 80 110 45 1 4 Extended Removal System 80 80 Max length A B C D E F 4 x 90 elbow 110 4 x 2 2 101 2 m D E C F B...

Страница 33: ...total length of the tubes must not exceed the maximum value defined If the removal installation includes elbows while calculating the total length you must take into account that each elbow has a resi...

Страница 34: ...AX 1 ON 2 ON 33LHWE Heating 2 stage MAX 3 4 Capacity 20LHWE 3 OFF 4 OFF 23LHWE 3 ON 4 OFF 28LHWE 3 OFF 4 ON 33LHWE 3 ON 4 ON 5 Burner Type Bekaert 5 OFF 6 7 Country Europe 6 OFF 7 OFF 8 Boiler Type Co...

Страница 35: ...IPX5D The electrical connection must be made via a bipolar switch located on the same premises as the boiler The switch must have a minimum pole separation of 3 mm 8 1 Accessing the Terminal Blocks Th...

Страница 36: ...he 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 the supply te...

Страница 37: ...witches and Parameters for the Terminal blocks 1 and 2 The DIP SW on the front panel that configures source of the heat demand is listed in the following table Switch Function Setting 4 5 Heat Demand...

Страница 38: ...controls to be NCB LHWE OpenTherm Protocol Room Controller 1 2 3 4 5 6 8 5 Terminal block 2 Connection The terminal block 2 is located below the front panel External devices powered by 230 VAC such as...

Страница 39: ...connector for the Navien Smart Room Controller on the back of the front panel terminal connection at the terminal block is not required Simply connect the Navien Smart Room Controller cable to the 2 p...

Страница 40: ...3 port diverter valve rated at 230VAC 3 port diverter valve 3 way valve CH CAUTION Be The boiler is supplied for connection the above valves to 230VAC Ensure it is connected to the right terminal fore...

Страница 41: ...41 Wiring Examples for Different Applications...

Страница 42: ...portdiverter valve CylinderTemp Sensor L Call L E N COM N DHW L CH L Orange Gray White Blue Green Yellow Junction box Note Use a junction box to make wiring connections A junction box is not included...

Страница 43: ...Sensor L Call L E N COM N DHW L CH L Gray Gray Brown Green Yellow Green Yellow Blue Brown Blue COM NO NC Orange Orange M COM NO NC M Junction box Note Use a junction box to make wiring connections The...

Страница 44: ...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 Check that the heating sys...

Страница 45: ...t temperature setting will be stored automatically Note Take note of the original heating temperature in case you want to restore it to the default The default space heating temperature range is 40 C...

Страница 46: ...he information types Display Description Space heating supply water temperature C Space heating return water temperature C External DHW tank temperature C with cylinder temp sensor 11 2 2 Adjusting th...

Страница 47: ...aller Boost interval time set by installer Space heating water pressure in Bar To exit information mode press the Reset button 11 4 Setting the Operation Mode 1 Using the Front Panel press and hold th...

Страница 48: ...timal space heating It helps limit the cost for space heating by preventing unnecessary fuel consumption and minimises air pollution 11 5 Setting the Parameters You can modify parameter settings for b...

Страница 49: ...et heat load types 1 Finned tube baseboard 2 FAN coil 3 Cast iron baseboard 4 Low mass radiant 5 High mass radiant 6 Radiator 7 Custom Outdoor Reset heat load not selected This mode is used to configu...

Страница 50: ...emperatures reach the set values for boiler operation stop temperatures The boiler will not resume space heating until the duration elapses even when the space heating supply or return temperatures re...

Страница 51: ...errun time is the duration the circulation pump continues to run between the space heating supply or return temperature reaching the set point and the burner turning off If the space heating supply or...

Страница 52: ...the return temperature are based on the return absolute MAX temperature range Return Absolute MAX Temperature Range Range Remarks MIN set point 10 C 70 C Default 65 C Setting the Burner On Temperature...

Страница 53: ...Setting Setting Remark DHW Heat Demand Default Cylinder temp sensor Setting the Return Absolute MIN Temperature Display Description Return absolute MIN set point C This menu can be used to change the...

Страница 54: ...n to save it The new password is displayed on the front panel for 3 seconds before the boiler returns to the parameter setting mode Note If you do not press the INFO button in 10 seconds after setting...

Страница 55: ...s reset the boiler to resolve the problem To reset the boiler press the Reset button If resetting the boiler does not solve the problem refer to the Troubleshooting section of this manual or contact T...

Страница 56: ...th the space 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 from freezing when it will n...

Страница 57: ...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 the power or gas supplies...

Страница 58: ...g season and or when there is a problem 12 5 Maintenance Schedules Owner maintenance Daily Check boiler area Check pressure temperature gauge Monthly Check flue piping Check condensate drain Periodica...

Страница 59: ...perty damage 1 Inspect all water and gas piping and verify to be leak free 2 Look for signs of leaking lines and correct any problems found Checking the Flue System and Air Piping 1 Visually inspect t...

Страница 60: ...w the proper shutdown procedure and to schedule an annual start up at the beginning of the next heating season WARNING Failure to inspect for the above conditions and have them repaired can result in...

Страница 61: ...r 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 all of the req...

Страница 62: ...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 Valve Gas Inlet Pipe Figure 2 1 20 23 28LHWE Internal Compon...

Страница 63: ...tion A Loosen the hex nut here Figure 3 2 Detaching Gas Inlet Pipe from Gas Valve and Fan Motor Assembly NCB 33LHWE Once the Gas Orifice is exposed remove the two screws that hold the part in place Re...

Страница 64: ...good condition and must be installed Failure to comply will cause a gas leak resulting in severe personal injury Replace the old Orifice piece with the new part for use with LP gas Ensure that the Ori...

Страница 65: ...the DIP switches could cause carbon monoxide poisoning resulting in severe personal injury 14 Turn on the gas and water supply to the boiler 15 Measure and adjust the gas air ratio a Loosen the screw...

Страница 66: ...lue is not within 0 5 of the value listed in Table 2 the gas valve set screw will need to be adjusted If adjustment is necessary locate the set screw as shown in Figure 8 Using a 5 32 in or 4 mm Allen...

Страница 67: ...removing the front panel label all wires and make sure all wires are disconnected 13 2 Cleaning the Heat Exchanger WARNING Before cleaning the heat exchanger make sure the boiler is off To properly m...

Страница 68: ...screws here Loosen the hex nut here NCB 20 23 28 33LHWE Remove 4 screws here Loosen the hex nut here NCB 33LHWE 8 Remove the screw connecting the fan motor assembly and the mixing chamber and then re...

Страница 69: ...keep electric parts of the boiler 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 Keep the water pr...

Страница 70: ...sor HEATING Supply Temp Sensor HEATING Return Temp Sensor B B B B B B B B Exhaust Temp Sensor B B COLOR CODE B Blue BK Black BR Brown O Orange R Red W White Y Yellow YG Yellow Green P Purple Air Press...

Страница 71: ...71 13 4 Ladder Diagram 3 15A Appendices...

Страница 72: ...n 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 correct temperature sen...

Страница 73: ...and then handed to the customer to keep for future reference GAS BOILER SYSTEM COMMISSIONING CHECKLIST CONTROLS Optimum start control Fitted Fitted Fitted Fitted ALL SYSTEMS Yes Yes CENTRAL HEATING MO...

Страница 74: ...the appropriate Service Interval Record is completed Service Provider SERVICE RECORD SERVICE 01 AND AND SERVICE 02 AND AND SERVICE 03 AND AND SERVICE 04 AND AND SERVICE 05 AND AND SERVICE 06 AND AND S...

Страница 75: ...Memo...

Страница 76: ...Memo...

Страница 77: ...Memo...

Страница 78: ...Memo...

Страница 79: ......

Страница 80: ...ervice If your boiler requires service you have several options for getting service www navien co uk Contact the technician or professional who installed your boiler Contact a Gas Safe Registered engi...

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