Buderus Logamax plus GB142-24 Servicing Instructions
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Buderus Logamax plus GB142-24 Servicing Instructions

Condensing gas boiler
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See also: Instructions for Installation and Servicing , Instructions

Servicing instructions

Logamax plus
GB142-24/30/45/60
WARNING!
Improper installation, adjustment, alteration, service or maintenance can
cause injury, loss of life or property damage. Refer to this manual. For
assistance or additional information consult a qualified installer, service
agency or the gas supplier.
NOTICE!
In the Commonwealth of Massachusetts this boiler must be installed by a
licensed Plumber or Gas Fitter.
Warning: If the information in these instructions is
not followed exactly, a fire or explosion may result
causing property damage, personal injury or death.
– Do not store or use gasoline or other flammable vapors and liquids in
the vicinity of this or any other boiler.
– What to do if you smell gas
• Do not try to light any boiler
• Do not touch any electrical switch; do not use any phone in your
building.
• Immediately call your gas supplier from a neighbor's phone. Follow
the gas supplier's instructions.
• If you cannot reach your gas supplier, call the fire department.
–
Installation and service must be performed by a qualified
installer, service agency or the gas supplier.
Notice:
This manual must be retained for future reference.
For installers
Please read thoroughly
before servicing
Condensing gas boiler

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Summary of Contents for Buderus Logamax plus GB142-24

  • Page 1: Servicing Instructions

    Servicing instructions Condensing gas boiler WARNING! Improper installation, adjustment, alteration, service or maintenance can cause injury, loss of life or property damage. Refer to this manual. For assistance or additional information consult a qualified installer, service agency or the gas supplier. NOTICE! In the Commonwealth of Massachusetts this boiler must be installed by a licensed Plumber or Gas Fitter.
  • Page 2 Updating of documentation Please contact us if you have any suggestions for improvements or corrections. Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!

  • Page 3: Table Of Contents

    Checking the fan unit; 120 VAC control 8.1.4 Checking the fan unit; supply cord (120V AC) 8.1.5 Checking the fan unit; tacho cable 8.1.6 Replacing the fan unit Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!

  • Page 4: Safety And General Instructions

    – If you find any defects, you must inform the owner of the sys- tem of the defect and the associated hazard in writing. Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!

  • Page 5: Observe These Instructions For Heating System Water

    For the installation and maintenance of the boiler you will need the standard tools for central heating, gas and water fitting. In addition, a handtruck with a fastening belt is very useful. Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!

  • Page 6: Abbreviations

    = Universal automatic burner control unit 3 = Locking boiler fault code = Wiring Centre WM10 = Controler for HK1, first Central Heating line = Two Port Zone Valve Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!

  • Page 7: Regulations And Guidelines

    Product approved air intake must be used. Installation shall be in strict compliance with the manufacturer's instructions. A copy of the installation. Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!

  • Page 8: Product Description

    ECO mode means that the temperature inside the hot water tank is 140 °F (60 °C), with a hysteresis ( T) of 18 °F instead of 9 °F Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!

  • Page 9: Operation

    – "Flue gas test" menu (page 10) – "Service Mode" menu (page 11) – "Manual Operation" menu (page 12) – "Settings" menu (page 12). Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!

  • Page 10: Flue Gas Test" Menu

    Deactivate flue gas test: Press and hold the chimney sweep button for more than 2 seconds, until the decimal point has disappeared. Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!

  • Page 11: Service Mode" Menu

    Deactivate service mode: Press and hold the "Chimney sweep" button for more than 2 seconds until the decimal point Press the "Service" button. has disappeared. Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!

  • Page 12: Manual Operation" Menu

    Deactivate manual operation: Press and hold the "Chimney sweep" button for more than 2 seconds until the flashing decimal point has disappeared. 4.2.4 "Adjustments" menu Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 13 Factory default setting "F 5" = 5 minutes. Have at least 5 min. passed without a button being pressed or was the power supply interrupted ? Press the "Service" button. Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!

  • Page 14: Function

    Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!

  • Page 15: Structure Diagram "Function

    Current heating system pressure. air purging phase proceeding. See page 20. okay? See chapter 6, 7 and 7.2. Press the "Service" button. page 16 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 16 9 °F (5 K) lower than temperature- the temperature set interrupted? dependent on the BC10 regulator? or RC? page 17 page 19 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 17 The "Burner" LED goes off. goes off. The blower stops. page 18 the supply temperature lower than the preset hot water temperature plus 63 °F (35 K)? Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 18 The primary circulation pump stops. The tank filling pump is stopped. Is there a heat request from the room or outdoor temperature-dependent regulator? page 16 page 19 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 19 30 seconds. temperature 11 °F (6 K) lower than the The primary circulation pump stops. target value? The blower stops. page 16 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!

  • Page 20: Symptoms

    4 using the RC control device or a service tool. codes shown will also flash. Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 21 30 seconds and maximum 1 minute. table 2 Display indications on the BC10 basic controller only visible using the service tool is being carried out Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 22 203 °F (95 °C). table 2 Display indications on the BC10 basic controller only visible using the service tool is being carried out Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 23 2 Display indications on the BC10 basic controller only visible using the service tool is being carried out Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 24 2 Display indications on the BC10 basic controller only visible using the service tool is being carried out Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 25 2 Display indications on the BC10 basic controller only visible using the service tool is being carried out Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 26 During startup after replacing the KIM or the UBA 3. During a fault in the UBA 3 or if the KIM is not recognized. table 3 LED on the UBA 3 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!

  • Page 27: Diagnosis

    Logamax plus GB142 does not enter the heating mode. Structure diagram for troubleshooting: page 44. Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 28 Is there any indication on the BC10 display? Turn the operating switch on the BC10 to position “0” (OFF). See page 9, par. 4.2. page 31 page 30 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 29 Measure the relevant part of the cable loom. See page 126. Replace the cable loom or the Is the cable loom okay? affected part thereof. page 83 page 31 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!

  • Page 30: Check The Fuse On The Rear Of The Uba 3

    “1” (ON). See page 9, par. 4.2. Replace the external primary Is there any indication on the circulation pump. BC10 display? Replace the fuse again. See page 84. page 31 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!

  • Page 31: Turn The Operating Switch On The Bc10 To Position "0" (Off). See Page 9, Par

    Make the heating system ready for operation. Turn the operating switch on the BC10 to position “1” (ON). See page 9, par. 4.2. Logamax plus GB142-15/24/30/45/60 okay. Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 32 Is the supply cord okay? page 83 Replace the supply cord of the transformer and replace the fuse again. See page 84. page 31 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 33 Check that the "Hot water mode" LED on the BC10 is lit. See page 8, fig 2. Is the LED lit? page 35 page 31 page 34 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 34 Are such items detected? Place the affected components out of service. page 31 page 83 Not hot water, branch 002 Not hot water, branch 003 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 35 Does the burner in the that corresponds with the fault code. boiler activate? Is a tank filling pump fitted? page 36 page 39 page 31 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!

  • Page 36: Yes

    Check the cable loom of the device. Replace the cable Is the cable loom okay? loom. Replace the circuit board. Is the tank filling pump running? page 31 page 83 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 37 As described for the primary circulation pump, the tank filling pump must be turned in the direction of rotation of the pump using a screwdriver. page 37 page 31 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 38 Is the capacitor of the tank filling pump okay? Replace the tank filling pump. Replace the capacitor. page 31 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 39 If the required inlet gas pressure is not Is the inlet gas pressure available, you should consult the relevant okay? gas utility company. page 31 page 40 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 40 Are such items detected? Place the affected components out of service. page 83 page 31 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 41 See "Adjustments" menu on page 12. enough? Is a hot water tank connected? page 31 page 83 Is a tank pump fitted? page 42 page 83 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 42 Replace the Is the cable loom cable loom. okay? Replace the connection board. Is the DHW circulation pump running? page 31 page 83 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 43 As described for the primary circulation pump, the DHW circulation pump must be turned in the direction of rotation of the pump using a screwdriver. page 43 page 31 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 44 DHW circulation Replace the capacitor. pump okay? Replace the DHW circulation pump. page 31 Hot water but no central heating continued -3 no central heating Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!

  • Page 45: Part Thereof

    See page 116, paragraph 8.1.33. Can a pressure indication be read out on the display? page 83 page 29 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!

  • Page 46: Faults With A Fault Code

    Locking boiler-fault code - (dash) No communication between UBA 3 and Other display code. BC10. Press the "Reset" button. fault message page 83 page 31 Operating code -A Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 47 (page 91). sensors okay? Check the primary circulation pump. Replace the primary Is the primary circulation pump okay? circulation pump. page 83 page 31 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 48 See page 116. Is the blocking boiler-fault code cleared from the display? page 83 page 31 Operating code 2F Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 49 (page 91). sensors okay? Check the primary circulation pump. Replace the primary Is the primary circulation circulation pump. pump okay? page 31 page 83 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 50 Check the primary circulation pump; check that the supply cord is not broken. Is the supply cord okay? Replace the supply cord. page 83 page 31 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 51 Is the pressure sensor Clean the pressure sensor. soiled? Replace the pressure sensor. See page 116. Has the malfunction been repaired? page 83 page 31 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 52 (page 91). sensors okay? Check the primary circulation pump. Replace the primary Is the primary circulation circulation pump. pump okay? page 31 page 83 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 53 (page 91). sensors okay? Check the primary circulation pump. Replace the primary Is the primary circulation circulation pump. pump okay? page 31 page 83 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 54 Has the malfunction been repaired? Check that the mains voltage is 120V AC. Sufficient mains voltage? Have the electrical system tested. page 31 page 83 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 55 Fully switch off the heat request and check that the blower is still operational after 1 minute. Is the blower still operational? page 83 page 31 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 56 Replace the tacho wire. See page 88. Attempt to rectify the fault by temporarily replacing the blower. See page 88. Has the malfunction been repaired? page 31 page 83 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 57 Try to remedy the fault by integrating another provisional blower. See page 88. Has the malfunction been repaired? page 83 page 31 Locking boiler-fault code 3P (flashing) Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 58 Blower wheel loose? Attempt to rectify the fault by temporarily fitting another blower. See page 88. Has the malfunction been repaired? page 83 page 31 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 59 Check the supply or return sensor (page 89). Are the supply and Replace the supply and return sensor return sensors okay? (page 91). page 31 page 83 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 60 See page 126. Replace the cable loom or the affected part Is the wiring thereof. okay? page 31 page 83 Locking boiler-fault code 4E (flashing) Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 61 Check the wire to the safety sensor for signs of short circuiting (page 92). Replace the cable loom or the affected part Is the wire okay? thereof. page 62 page 62 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 62 Check the safety sensor (page 89). Is the safety sensor okay? Replace the safety sensor (page 91). page 31 page 83 Locking boiler fault code 4P Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 63 Check the supply and return sensor (page 89). Replace the supply and return sensor Are the supply and return (page 91). sensors okay? page 31 page 83 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 64 Check the supply and return sensor (page 89). Are the supply Replace the supply and return sensor and return sensors okay? (page 91). page 31 page 83 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 65 See page 93. Is the resistance of the Replace the hot surface ignitor. hot surface ignitor See page 94. okay? page 66 page 71 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 66 See page 127, table 5. Was the Fit the correct gas orifice. correct gas orifice See page 127, table 5. fitted? page 67 page 71 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 67 Measure the ionization current. See page 95. Is the ionization current page 71 okay? page 71 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 68 UBA 3. See page 99. Replace the cable loom or the affected part Is the wiring okay? thereof. page 83 page 71 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 69 UBA 3 mounting base. Replace the cable loom or the affected part Is the wiring okay? thereof. page 71 page 83 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 70 Check whether the overall gas-conduit network is of sufficient capacity. Is the overall gas-conduit Reinforce the gas-conduit network. network of sufficient capacity? Consult the utility company. page 71 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 71 Did you go through all structure diagrams thru 35 ? page 65 page 83 page 31 6A Branch 08 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 72 See page 108, par. 8.1.26. Replace the gas valve. Is the burner still under See page 101. pressure? page 77 page 31 Locking boiler fault code 6C-2 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 73 Measure the gas/air ratio during the startup phase. See page 108. Adjust the gas/air ratio. Is the gas/air ratio correctly See page 108. adjusted? page 74 page 77 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 74 Measure the ionization current. See page 95. Is the ionization current page 77 okay? page 77 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 75 Did you find a blockage? Deal with blockage. If the required inlet gas pressure is not available, you should consult the relevant gas utility company. page 77 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 76 Is the overall gas-conduit Reinforce the gas-conduit network. network of sufficient capacity? Consult the gas utility company. page 77 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 77 Did you go through all structure diagrams thru 14? page 29 page 83 page 31 locking boiler fault code 6L Zijtak 1e 5 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 78 Remedy the fault using the structure diagram that corresponds with the fault code. page 31 Locking boiler-fault code 7C Locking boiler-fault code 7L (flashing) Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 79 Check the contact between the UBA 3 and the UBA 3 mounting base. Is the contact okay? Restore the contact. page 31 page 83 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 80 Locking boiler-fault code. 2 9 0 Press the button. "Reset" fault message page 31 page 83 Locking boiler fault codes 9A, 9H, 9P, 9U, E Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 81 Measure the resistance of the two gas valve coils. See page 101, par. 8.1.22. Replace the gas valve. Is the resistance correct? See page 101. page 31 page 83 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 82 Try to remedy the fault by integrating another provisional pressure sensor. See page 116. Has the malfunction been repaired? page 31 page 83 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 83 See on the back side of this document. Remedy the fault using the structure diagram Has a new fault occurred? from this document that corresponds with the fault code. page 31 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!

  • Page 84: Actions

     Switch on the power supply of the heating system on the circuit breaker.  Set the main switch on the BC10 to "1" (On). Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!

  • Page 85: External Connection Board Fuse

    8: DHW tank pump 120V 60Hz (connection color grey) pos. 9: DHW recirculating pump 120V 60Hz (connection color lilac) pos. 10: main connection 120V 60Hz (connection color white) pos. 11: Fuse holder Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!

  • Page 86: Checking The Fan Unit; 120 Vac Control

     Switch on the power supply of the heating system on the circuit breaker.  Set the main switch on the BC10 to "1" (On). Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!

  • Page 87: Checking The Fan Unit; Supply Cord (120V Ac)

     Switch on the power supply of the heating system on the circuit breaker.  Set the main switch on the BC10 to "1" (On).  Fit the casing. fig. 10 UBA 3 installation base Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!

  • Page 88: Checking The Fan Unit; Tacho Cable

     Remove both cable plugs from the fan unit (see fig. 12, pos. 1). fig. 12 Disconnect the cable plug from the fan unit Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!

  • Page 89: Checking The Supply/Return/Safety/Hot-Water Temperature Sensors

     Switch off the power supply of the heating system on the circuit breaker.  Set the main switch on the BC10 to "0" (Off).  Remove the casing. fig. 14 Checking the supply/return sensors Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 90 18,787 15,136 12,268 10,000 8,197 6,754 5,594 4,656 3,893 3,271 2,760 2,339 1,990 1,700 1,458 1,255 1,084 table 4 Sensor resistance values (target values) Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!

  • Page 91: Checking The Hot-Water Temperature Sensor

     Switch on the power supply of the heating system on the circuit breaker.  Set the main switch on the BC10 to "1" (On). Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!

  • Page 92: Checking The Supply/Return/Safety Sensors Cable

     Connect the measuring device to the plug on the cable harness.  Connect the heating system to the power supply, insert the main fuse or switch on the circuit breaker. Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!

  • Page 93: Checking The Hot Surface Ignitor; Resistance

     Remove the UBA 3 by pulling it forward as indicated by the arrow (see fig. 21, pos. 2).  Set the volt-ohm-multimeter to "Resistance testing". fig. 21 Dismantling the UBA 3 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 94 (see fig. 24, pos. 1).  Restore the plug and socket connection of the hot surface ignitor.  Fit the casing. Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!

  • Page 95: Testing The Ionization Current

     Remove the UBA 3 by pulling it forward as indicated by the arrow (see fig. 26, pos. 2). fig. 26 Dismantling the UBA 3 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 96 27 Testing the earth connection circuit of the ionization electrode (1) UBA3 fig. 28 Testing the earth connection circuit of the ionization electrode (2) Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!

  • Page 97: Checking The Ionization Electrode; Replace If Necessary

     Switch on the power supply of the heating system on the circuit breaker.  Set the main switch on the BC10 to "1" (On). fig. 31 Checking the ionization electrode Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!

  • Page 98: Checking The Gas Control Valve; Cable Connections

    (see fig. 33).  Fit the casing. Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!

  • Page 99: Checking The Gas Control Valve; Cable Connection Between Gas Control Valve And Uba 3 Installation Base

     Set the main switch on the BC10 to "1" (On). fig. 36 Testing the cable between the gas control valve and the UBA 3 installation base Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!

  • Page 100: Ohming Out The Gas Control Valve

     Switch on the power supply of the heating system on the circuit breaker.  Set the main switch on the BC10 to "1" (On). fig. 39 Testing the resistance on the gas burner ass’y (1) Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!

  • Page 101: Replacing The Gas Control Valve

    (2)  Remove the cable plug from the gas control valve (see fig. 42, pos. 1). fig. 42 Removing the gas control valve plug Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 102 1) of the burner cover and remove the burner cover with the fan unit and the gas burner fitting. fig. 45 Loosening the retaining clips Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 103  Switch on the power supply of the heating system on the circuit fig. 48 Dismantling the gas orifice breaker.  Set the main switch on the BC10 to "1" (On). Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!

  • Page 104: Checking The Control Unit; Connections To The Boiler

    [-/h/\| ) after some time, the fault is caused by the cable fig. 51 Installing the cover of the connection box between the On/Off thermostat and the boiler. Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 105 8: DHW tank pump 120V 60Hz (connection color grey) pos. 9: DHW recirculating pump 120V 60Hz (connection color lilac) pos. 10: Main connection 120V 60Hz (connection color white) pos. 11: Fuse holder Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!

  • Page 106: Bleed The Gas Supply Pipe

     Switch on the power supply of the heating system on the circuit breaker.  Set the main switch on the BC10 to "1" (On). Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!

  • Page 107: Measuring The Inlet Gas Pressure (Flow Pressure)

    If the inlet gas pressure is too high, a gas pressure regu- lator is to be integrated upstream of the gas valve. Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!

  • Page 108: Measure And Adjust The Gas/Air Ratio

    Adjusting the gas/air ratio  Check the testing nipple for leaks.  Fit the casing.  Set the main switch on the BC10 to "1" (On). Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!

  • Page 109: Measuring The Carbon Monoxide Content (Co)

     Pull the 4 plugs from the external connection board (see fig. 63, pos. 1, 2, 3 and 4). fig. 63 Pulling the external connection board plug Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 110  Remove the external connection board (see fig. 65). fig. 65 Removing the external connection board  Remove the transformer shield (see fig. 66). fig. 66 Removing the transformer shield Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!

  • Page 111: Automatic Air Purging System; Replacing

     Remove the casing.  Close the maintenance shut-off valves and drain the Logamax plus GB142. (see fig. 69). fig. 69 Draining the Logamax plus GB142 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 112  Set the main switch on the BC10 to "1" (On). fig. 72 Dismantling the valve case for the automatic air purging system Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!

  • Page 113: Burner; Replacing

     Remove both cable plugs from the fan unit (see fig. 75, pos. 1). fig. 75 Disconnecting the cable plug from the fan unit Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 114 GB142-60 has a different shape.  Remove the burner (see fig. 78, pos. 4). fig. 78 Removing the burner Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!

  • Page 115: Sight Glass; Replacing

     Switch on the power supply of the heating system on the circuit breaker.  Set the main switch on the BC10 to "1" (On). fig. 81 Loosening the screws of the sight glass Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!

  • Page 116: Condensate Trap; Replacing

     Switch on the power supply of the heating system on the circuit breaker.  Set the main switch on the BC10 to "1" (On). fig. 84 Loosening the pressure sensor Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!

  • Page 117: Heat Exchanger; Replacing

     Remove both cable plugs from the fan unit (see fig. 87, pos. 1). fig. 87 Disconnecting the cable plug from the fan unit Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 118 GB142-60 has a different shape.  Remove the burner (see fig. 90, pos. 4). fig. 90 Removing the burner Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 119 92 Disconnect the plug and socket connection of the return sensor fig. 93 Disconnect the plug and socket connection of the safety sensor Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 120  Pull the earth cable from the hot surface ignitor (see fig. 96, pos. 2).  Dismantle the mounting plate (see fig. 96, pos. 3). fig. 96 Replacing the hot surface ignitor Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 121  Open the four latches of the condensate collector (see fig. 99, pos. 1). fig. 99 Opening the latches of the condensate collector Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 122  Pull the supply pipe out of the heat exchanger (see fig. 102, pos. 1). WARNING! Water will be released. fig. 102 Removing the supply pipe Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 123  Loosen the 6 fastening screws of the flue gas adapter (see fig. 105, pos. 1). fig. 105 Loosening the fastening screws Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 124  Set the gas/air ratio again. See paragraph 8.1.26, page 108. fig. 108 Gas shut-off valve closed (1), gas shut-off valve open Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!

  • Page 125: Uba 3; Replacing

     Switch on the power supply of the heating system on the circuit breaker.  Set the main switch on the BC10 to "1" (On). fig. 109 Dismantling the UBA 3 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!

  • Page 126: Appendix

    230 VAC 10 VAC 120 VAC 10 VAC 120 VAC 24 VAC 0 VAC 24 VRAC 24 VRAC 120 VAC fig. 110 Electric circuit diagram Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 127  The article number of the Venturi is located on both clamps of the Venturi (see fig. 111, pos. 1 and 2). fig. 111 Venturi article number Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!

  • Page 128: Spare Parts

    73904s Mounting plate 7098852 UBA cover 7099047 Seal mounting plate (5 pc) 7098850 UBA 3 - 120V 7099707 ** not shown in exploded views Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 129 Coupling nut pump 73481s Seal pump (10 pc) 15022s Coupling nut pump 15020 Conversion set pump 73149 Condensate drain set, incl. pos. 44 8718600686 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 130 Spare parts Exploded view Logamax plus GB142-24/30 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 131 Spare parts Exploded view Logamax plus GB142-45/60 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
  • Page 132 Unites States and Canada Bosch Thermotechnology Corp. 50 Wentworth Avenue Londonderry, NH 03053 Tel. 603-552-1100 Fax 603-584-1681 www.buderus.us U.S.A. Products manufactured by Bosch Thermotechnik GmbH Sophienstrasse 30-32 D-35576 Wetzlar www.buderus.com Bosch Thermotechnology Corp. reserves the right to make changes without notice due to continuing...

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Logamax plus gb142-30Logamax plus gb142-45Logamax plus gb142-60

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