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Installation and service instructions
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Please follow these safety instructions closely to
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Auxiliary components, spare and wearing parts
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Any usage beyond this must be approved by the man-
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Removing the front panel
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3. Remove the installation kit from the gas pipe.
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Fitting the boiler to the pre-plumbing jig
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Take care not to injure your hands.
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The "System certificate" and "Skoberne GmbH flue
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Opening the control unit enclosure (cont.)
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5 4 3 2 1
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Routing connecting cables/leads
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A Floating contact (when connecting, remove jumper
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Power supply and KM BUS connection of accessories
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Multi boiler system:
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Total heating output
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Fitting the front panel
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6. Activate the venting function with "Yes" or "
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Settings and explanations
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4. Compare the device list with the system compo-
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3. To view a summary of the system configuration,
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1. To change the gas type on the control unit, see
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Supply pressure (flow pressure)
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Burner in operation
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The pump speed and consequently the pump rate are
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Residual head of the integral circulation pump
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Tap the following buttons:
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Escaping flue gas poses a risk to health.
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Check burner gasket A and burner gauze assembly
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A Ignition electrodes
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1. Drain the boiler on the DHW side.
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Escaping gas leads to a risk of explosion.
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Outside temperature in °C
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Boiler water or
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Boiler control unit
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3. Enter the password "viservice".
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■ Parameters are split into the following groups:
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Parameter values in bold are factory settings.
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"LON subscriber number"
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"Interval until the next service"
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"Maximum cylinder temperature"
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"Pump idle time"
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"Maximum flow temperature limit, heating circuit"
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"Time limit for comfort mode"
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"Wireless outside temperature sensor"
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"Function, input DE1 at extension EA1"
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"Display correction for outside temperature"
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"Fault messaging delay"
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"SCOT correction factor, flue length"
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"LON subscriber monitoring"
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"Operating mode, internal circulation pump"
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"Additional function for DHW heating"
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"DHW circulation pump for DHW heating"
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"Controller amplification of speed control"
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"Frost protection function for solar circuit"
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"Minimum collector temperature"
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"Priority for DHW cylinder"
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"Temperature limits, frost protection function"
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With economy function outside tem-
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"Room temperature hook-up"
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"Setting range, set day temperature"
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Screed drying disabled
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"Pump start heating circuit pump A1, standby mode"
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6. Tap "Code" or "
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Neuron chip software version
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Diverter valve set to heating mode
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Regulates as if the outside
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Mixer is being closed.
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Burner in a fault state
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CO limiter sensor fault
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Mixer regulates to 20 °C flow
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3. If the boiler needs to be removed:
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04. Remove the 4 screws from the fitting assembly.
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Checking the temperature sensors
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2. Measure the sensor resistance across "X3.1" and
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Checking the plate heat exchanger
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Checking the temperature limiter
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Checking the fuse
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Check flow temperature sensor
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The following details are required when ordering
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Serial no. 7570778, 7570780, 7570784, 7570786
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Overview of assemblies (cont.)
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Diaphragm grommet DN 60
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Heat cell assemb
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Boiler flue connection
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Burner gasket (wearing part)
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Diaphragm expansion vessel 10 l
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Hydraulic assembly, system boiler
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Air vent valve
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Control unit assembly
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Control unit VBC138-A10.0xx
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Touch-up spray paint, white, 150 ml can
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Internal H1 extension
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Internal H2 extension
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fÖ A Power supply for additional accessories
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Digital input 1
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Temperature profile 4: Parameter F1:4
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Boiler water temperature sensor
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Switching mode power supply
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Settings and test values
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Gas condensing system boiler (type B2HB)
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Rated heating output range (to EN 15502-1)
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Available in the following countries
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Viessmann products can be recycled. Components
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Vitodens 200-W, type B2HB and B2KB
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Hortonwood 30, Telford
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