Lennox GCWB95F-150 Application Manual
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Lennox GCWB95F-150 Application Manual

Lennox GCWB95F-150 Application Manual

Combi condensing gas boiler
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PRODUCT LITERATURE
Lennox Industries Inc.
Dallas, Texas
This manual has been prepared for use with the appropriate Installation, Operation and
APPLICATION
FOR USE WITH
GCWB95F-150
Maintenance Manual.
GUIDE
COMBI
CONDENSING
GAS BOILER
240013003 REV A [04/15/2020]

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Summary of Contents for Lennox GCWB95F-150

  • Page 1 APPLICATION PRODUCT LITERATURE Lennox Industries Inc. Dallas, Texas GUIDE FOR USE WITH GCWB95F-150 COMBI CONDENSING GAS BOILER This manual has been prepared for use with the appropriate Installation, Operation and Maintenance Manual. 240013003 REV A [04/15/2020]...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS Important Safety Information ..................3 Labor Saving Piping Manifold / Near Boiler Piping Connections........4 General Information - Hydronic Piping ................5 General Information - Wiring ..................7 Piping And Wiring Diagrams Piping Legend ........................8 GCWB9F-150 With Zone Circulator Pumps - Piping Diagram ..........9 GCWB9F-150 With Zone Pumps - Wiring Diagram ............

  • Page 3: Important Safety Information

    IMPORTANT SAFETY INFORMATION 1. General 3. Installation shall conform to requirements of Boiler installation shall be completed by qualified agency. authority having jurisdiction or in absence of such See Installation, Operation & Maintenance Manual for requirements: additional information. • United States •...

  • Page 4: Labor Saving Piping Manifold / Near Boiler Piping Connections

    NEAR BOILER PIPING CONNECTIONS GCWB95F-150 COMBI LEGEND Heating supply connection 11/4” sweat DHW outlet 1/2" sweat Drain connection for condensate 3/4" NPT Gas shutoff connection 3/4" NPT Cold DHW inlet tap 1/2" sweat 11/4” sweat Heating return connection PN 240013003 REV. A [04/15/2020]...

  • Page 5: General Information - Hydronic Piping

    GENERAL INFORMATION - HYDRONIC PIPING WARNING FOR YOUR SAFETY READ BEFORE OPERATING Burn and scald hazard! Manufacturer requires installation of field supplied anti-scald valve. DANGER Failure to follow these instructions could result in death or serious injury. General Information: Piping installation, materials, and joining methods shall conform to requirements of authority having jurisdiction or in absence of such requirements: •...
  • Page 6 GENERAL INFORMATION - HYDRONIC PIPING Provided Wiring and Piping illustrations Water 1st Degree Burn 2nd and 3rd Degree Burn Note are meant to show system concepts only. Temperature Exposure Time For Exposure Time For An Installer is responsible for all equipment Setting An Adult Adult...

  • Page 7: General Information - Wiring

    GENERAL INFORMATION - WIRING Electical Wiring Information: DO NOT use 120 V thermostat Note All field wiring shall conform to the authority having terminals (m1- #1 and #2). jurisdiction or, in the absence of such requirements to: • USA: National Electrical Code, ANSI/NFPA 70, •...

  • Page 8: Piping Legend

    PIPING LEGEND PIPING LEGEND TEMPERATURE & PRESSURE GAUGE ZONE VALVE EXPANSION TANK BALL VALVE FLAT PLATE HEAT EXCHANGER (COMBI ONLY) AIR SEPARATOR STRAINER CIRCULATOR MAGNETIC DIRT SEPARATOR DRAIN COMBINATION FILL FLOW CHECK VALVE BYPASS VALVE DIVERTER VALVE T&P OR RELIEF VALVE THERMOSTATIC MIXING VALVE PURGE VALVE PN 240013003 REV.

  • Page 9: Gcwb9F-150 With Zone Circulator Pumps - Piping Diagram

    GCWB95F-150 WITH ZONE CIRCULATOR PUMPS - PIPING DIAGRAM PN 240013003 REV. A [04/15/2020]...

  • Page 10: Gcwb9F-150 With Zone Pumps - Wiring Diagram

    GCWB95F-150- WITH ZONE PUMPS - WIRING DIAGRAM PN 240013003 REV. A [04/15/2020]...

  • Page 11: Gcwb9F-150 With Zone Pumps

    GCWB95F-150 WITH ZONE VALVES - PIPING DIAGRAM PN 240013003 REV. A [04/15/2020]...

  • Page 12: Gcwb9F-150 With Zone Valves - Piping Diagram

    GCWB95F-150 WITH ZONE VALVES - WIRING DIAGRAM PN 240013003 REV. A [04/15/2020]...

  • Page 13: Lbuffer Tank - Piping And Wiring Diagram

    LOW MASS - PIPING DIAGRAM Buffer Tank Piping When installing low mass systems, additional water mass may be required to avoid short cycling by the boiler. In these applications it is recommended that a buffer tank be installed. Buffer Tank on Central Heat Circuit Note: •...

  • Page 14: Optional Equipment

    OPTIONAL EQUIPMENT Optional Equipment IMPORTANT: Sensors supplied with this boiler are proprietary to the manufacturer. Use of alternate market sensors WILL diminish boiler performanc Outdoor Air Sensor, if used. 1k Ω A. Boiler automatically recognizes sensor when used. B. See Chart 1 for sensor data. Sensor part number BD710487302V C.

  • Page 15: Gcwb9F-150 Floor Standing - Combi Wiring Diagram

    ACCESSORIES Accessories: • Use lower value of range as the desired Kt value. 1. 1k Ω Outdoor Temperature Sensor Kit - (Example): to deliver 186°F water @ OT of -20°F = Kt range is 90 thru BD710487302V 25. Select 25. Use Outdoor Sensor Kit with Heating Only or Combi Boilers.
  • Page 16 Demand is activated above 3V and the heating setpoint is calculated in proportion to deviation from 3 to 10 V DC, to give a setpoint that goes from minimum to maximum. GCWB95F-150 P78=1 P78 = 2...
  • Page 17 150F FLOOR STANDING - COMBI WIRING DIAGRAM MODEL 150F - Combi PN 240013003 REV. A [04/15/2020]...

  • Page 18: Altitude Effects On Boiler Performance

    ALTITUDE EFFECTS ON BOILER PERFORMANCE Model GCWB95F-150 MODELS 125/150 CALCULATED EFFECTS OF HI-ALTITUDE ON BOILER PERFORMANCE 160,000 140,000 120,000 DHW MODE 100,000 HEAT MODE 80,000 60,000 NET RATNG HEAT MODE 40,000 2,000 4,000 6,000 8,000 10,000 ALTITUDE (FEET) MODELS 165/205...
  • Page 19 A - LOW WATER CUTOFF • Locate LWCO sensing device in the supply Low Water Cut Off piping, above the minimum height of boiler. These guidelines are supplied when necessary to install See Figure A-2, Piping Diagram. an additional Low Water Cut Off (LWCO), for sensing a low water level condition in a boiler, as required by the •...

  • Page 20: Low Water Cutoff Application

    LOW WATER CUTOFF Piping Diagram - LWCO Location Arrange piping to prevent Note water dripping onto boiler. Illustrations are meant to Note show system piping concept only. Installer is responsible for all equipment and detailing required by authority having jurisdiction. Low Water Cutoff (LWCO) (See Figure 6-5 for detail) Purge Valve...
  • Page 21 LOW WATER CUTOFF Low Water Cutoff - Detail PN 240013003 REV. A [04/15/2020]...

  • Page 22: Error Code Table

    ERROR CODE TABLE NOTE: When instructed press and hold the 'Reset' for between 1-3 seconds to reset the boiler. Initial Fault Finding Checks 1. Check that gas, water and electrical supplies are available at the boiler. Table Of Error Codes 2.

  • Page 23: Troubleshooting Chart

    TROUBLESHOOTING CHART PN 240013003 REV. A [04/15/2020]...
  • Page 24 TROUBLESHOOTING CHART Domestic hot water 15 and 384 is flashing or re-occurs regularly Turn on mains power. check all PCB connections, if this has no effect replace Go to section 'A' the PCB. The display illuminates Error 110 or 133 or 134 or 135 or 125 or 384 or If the E11 o is still flashing.

  • Page 25: Fault Solution Sections

    FAULT SOLUTION SECTIONS Fault Finding Solutions Sections Power supply 120V Main terminals L and N Check electrical supply Connection OK at connector x1 0 Integrity of the fuse Replace fuse Main or Display Display PCB fault PCB - X1 0 connector illuminated Check wiring Mains terminals L &...
  • Page 26 FAULT SOLUTION SECTIONS Temperature sensor faulty. Check correct location and wiring Temperature sensors faulty. _ _ �.,, Replace sensor , _ _ Cold resistance approximately ° 10k0 @ 77 F (CH sensor) ° 20k0 @ 77 F (Flue sensor) (resistance reduces with increase in temp.) Gas at burner Ensure gas is on and purged .----------------, NO...
  • Page 27 FAULT SOLUTION SECTIONS Overheat thermostat operated or Check for and correct any system faulty. faults (water circulation). Allow to cool. Continuity �I across thermostat terminals � Replace safety thermostat '---------------' more than 1.5 ohm Is E11 O is still flashing Check Flow, Return, Replace PCB sensors.
  • Page 28 Verify the position of the Service key Remove the obstruction on the flue pipe Check obstruction in the flue duct Performs the calibration function (see the Service manual) Check the electrical connection between Ru and pcb PRODUCT LITERATURE Lennox Industries Inc. Dallas, Texas...

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