Viessmann Vitodens 100-W Installation and Start-up Guide
For use by a licensed professional heating contractor for typical installations.
Models
Vitodens 100-W, B1HA/B1KA
- Wall-Mounted, gas-fired condensing boilers
- On demand domestic hot water with Combi boiler
- Heating input: 21 to 125 MBH (6.2 to 36.6 kW)
- DHW boost function (B1HA only) 149 MBH (43.7 kW)
Important Information
This guide provides a quick overview for licensed professional heating contractors. It is not a substitute for the technical support literature supplied with the boiler and accessories. Failure to follow technical literature may lead to property damage, personal injury, or loss of life, and may void the warranty.
Codes: Installation must comply with local codes, or CAN/CSA-B149.1 or .2 (Canada) / National Fuel Gas Code ANSI Z223.1 (U.S.). Electrical wiring must comply with CSA C22.1 Part 1 (Canada) / National Electrical Code ANSI/NFPA 70 (U.S.). Also comply with ANSI/ASME CSD-1 and CSA B214-01 where required.
Fuel: The boiler is factory configured for Natural Gas. Use the supplied conversion kit for Propane Gas.
1. Unpacking and Included with Boiler
- Instruction manuals and fuel conversion kit
- Installation set
- Mounting hardware
- Flexible condensate discharge tubing
- Packaging
- Boiler wall mounting bracket
- Boiler
2. Boiler Installation Dimensions and Mounting Details
Refer to the "Dimensions and Installation" sections of the B1HA/B1KA Installation and Service Instructions for more detail.
Minimum clearances: 9% in. (250 mm) top, 178 mm (7 in.) sides, 14 in. (355 mm) front.
Dimensions: Height: 29% in. (760 mm), Width: 17½ in. (445 mm), Depth: 13% in. (340 mm).
3. Installation Fittings and Typical Piping Connections
Legend:
- A: Boiler heating system supply
- B: B1HA - Tank heating supply / B1KA - DHW connection with pressure relief valve (PRV)
- C: Boiler heating system return
- D: Gas connection
- E: B1KA - DCW connection
- F: B1HA - Tank heating return
- G: Low loss header (accessory)
Connections: Use closely spaced tees (4x the pipe diameter) for supply and return connections. Refer to the "Connections" section of the B1HA/B1KA Installation and Service Instructions for more detail.
IMPORTANT: Ensure the boiler bracket and boiler are securely fastened and level.
4. Boiler Condensate Connection
Install the flexible condensate discharge tube onto the boiler syphon discharge. Ensure the line is clear and not exposed to freezing temperatures.
Legend:
- A: Flexible condensate discharge tubing (from boiler)
- B: Condensate discharge tubing with clamps (field supplied) for connection to neutralization unit and/or sewage drain.
Neutralizer Unit: Optional. Consult local codes. Refer to "Neutralization Unit" Instructions.
5. Filling the Siphon with Water
Fill the siphon with 10 fl. oz. (0.3 liters) of water into the boiler adaptor before start-up.
6. Preparing for Vent Connection
The Vitodens 100-W comes with a pre-installed vent pipe adaptor. Install the venting system (single-pipe, two-pipe, or coaxial) through the side wall or roof, using the shortest possible route and a horizontal rise of 2 in./3.3 ft. (50 mm/1 m).
For single or two pipe systems: Remove the center section of the boiler flue adaptor air inlet cover and combustion air inlet cover, leaving the rubber seal in place.
For coaxial venting system: Keep the combustion air inlet cover installed and remove the boiler flue adaptor air inlet cover.
Venting Materials: Use only UL1738/ULC S636 certified venting components. Refer to "Rigid and Flex Pipe Venting Systems" Instructions.
7. Coaxial Vent System Boiler Connections
Maximum equivalent vent length:
- 60/100 & 80/125: 82 ft. (25 m)
- 100/150 & 110/160: 118 ft. (36 m)
Component Equivalent Length: 87° elbow/87° inspection tee = 1.6 ft. (0.5 m), 45° elbow = 1 ft. (0.3 m).
8. Flue Connection for Single or Two Pipe Systems
Maximum equivalent vent length:
- 2 in. (51 mm): 98 ft. (30 m)
- 3 in. (76 mm): 164 ft. (50 m)
- 4 in. (102 mm): 200 ft. (61 m)
Component Equivalent Length: Standard long sweep elbows = 1.6 ft. (0.50 m), 45° elbow = 1 ft. (0.3 m).
9. Combustion Air Connection for Two Pipe Systems
Maximum equivalent vent length:
- 2 in. (51 mm): 98 ft. (30 m)
- 3 in. (76 mm): 164 ft. (50 m)
- 4 in. (102 mm): 200 ft. (61 m)
Component Equivalent Length: Plastic pipe 90° elbow = 5 ft. (1.52 m), 45° elbow = 3 ft. (0.91 m).
10. Typical Single Pipe and Coaxial Pipe Venting Layouts
Refer to the "Rigid and Flex Pipe Venting Systems" Instructions supplied.
11. Typical Two Pipe Venting Layouts
Refer to the "Rigid and Flex Pipe Venting Systems" Instructions supplied.
Venting Material Equivalent Length:
- Stainless steel: 3 ft. (0.91 m) for 87° elbow, 2 ft. (0.61 m) for 45° elbow
- CPVC plastic pipe: 5 ft. (1.52 m) for 87° elbow, 3 ft. (0.91 m) for 45° elbow
- PP(s): 1 ft. (0.30 m) for 87° elbow, 1.6 ft. (0.50 m) for 45° elbow
12. Accessing the Electrical Connections
Loosen the two retaining screws and remove the front cover. Press the two retaining tabs and lower the control console.
Terminal Block: Connect room thermostat(s) and outdoor temperature sensor. Connectors for DHW tank temperature sensor.
Refer to the "Control Connections" section of the B1HA/B1KA Installation and Service Instructions for more detail.
13. Connecting DHW Tank Temperature Sensor (B1HA) Optional
Sensor Connection: Install the supplied tank temperature sensor into the tank. Attach the factory-installed connectors into the supplied temperature sensor connector.
Tank Temperature Controller (Field Supplied): Connect the field supplied controller by cutting and stripping the two red connectors. Connect the controller wiring and the stripped wiring with wire connectors.
Refer to the "Tank Temperature Controller" manufacturer's Instructions for more detail.
14. Fixed Setpoint With or Without Room Temperature Thermostat
Connect jumper A to terminals 1 and 2. Connect switching relay C with a 24VAC thermostat B to terminals 1 and 2.
Refer to the “Control Connections” section of the B1HA/B1KA Installation and Service Instructions for more detail.
15. Weather-Compensated With or Without Room Temp. Thermostat
Connect jumper A to terminals 1 and 2. Connect outdoor temperature sensor D to terminals 3 and 4.
Alternatively, connect a switching relay C with a 24VAC thermostat B to terminals 1 and 2, and connect the outdoor temperature sensor D to terminals 3 and 4.
Refer to the “Control Connections” section of the B1HA/B1KA Installation and Service Instructions for more detail.
16. Converting from Natural Gas (NG) to Liquid Propane Gas (LPG)
IMPORTANT: The boiler control MUST be programmed for Liquid Propane Gas (LPG) after fuel conversion and system installation. Apply new labels as shown.
Refer to the “Fuel Conversion and Labelling Instructions” supplied with the conversion kit.
17. Boiler Conversion Liquid Propane Gas Labels and Programming
Legend:
- A: CSA Rating Plate
- B: Field Conversion Label
- C: Gas Type Label
Refer to the “Fuel Conversion and Labelling Instructions” supplied with the conversion kit.
18. Boiler Power Supply
120/1/60 12A Power Supply with disconnect and protection. The Vitodens 100-W comes with a pre-installed power cord with a 3-prong plug for simplified installation. The power cord can be cut for hard wiring.
Refer to the “Control Connections” section of the B1HA/B1KA Installation and Service Instructions for more detail.
19. Filling and Bleeding the Heating System
IMPORTANT: Prior to filling, thoroughly flush the entire heating system. Use only potable quality water. Fill and remove air from the heat exchanger.
Procedure:
- Attach bleeding tube B to bleeding port A.
- Use key C to bleed the air.
- Once complete, close bleeding port A and remove bleeding tube B.
Legend:
- A: Bleeding port (installed)
- B: Bleeding tube (supplied)
- C: Bleeding port key (supplied)
Refer to the “Start-up, Inspection and Maintenance” section of the B1HA/B1KA Installation and Service Instructions for more detail.
20. Touch Screen User Interface
Control and display elements:
- A: Display value or "F" (fault)
- B: Temperature in °F/°C
- C: Heating mode
- D: DHW heating
- E: Display value or fault code
- F: Fault indicator
- G: Burner fault reset
- H: Temperature in °F/°C
- I: On-screen buttons
- J: Commissioning setting active (contractors only)
- K: DHW comfort function active (only for B1KA)
- L: Current burner output (each bar = 20%)
- M: DHW comfort function not active (only for B1KA)
- N: Service setting active (contractors only)
- O: Burner in operation
On-screen buttons:
- MODE: Selecting/terminating functions
- ▼/▲: Changing or selecting values
- OK: Accepting values/confirming selection
- ◀: 1 step back
The control unit is preset for standard operation. Factory presets can be adjusted.
21. Fault Display
In case of a fault, the display will flash and the fault code appears. Perform combustion analysis after clearing faults.
Refer to the “Troubleshooting” section of the B1HA/B1KA Installation and Service Instructions for more detail.
22. Setting the Central Heating Temperature Fixed Set Point
Operation with or without room temperature thermostat.
The default heating water temperature is set to 158°F (70°C).
Procedure:
- Tap MODE.
- Tap ▼/▲ until the desired heating water temperature flashes and "r" is displayed.
- Tap ▼/▲ until the required heating water temperature is displayed.
- Tap OK to confirm.
Note: Set the central heating temperature using these steps when not using an outdoor temperature sensor.
23. Setting the Central Heating Temperature Weather-compensated
Weather-compensated operation with or without room temperature thermostat.
The left side of the display shows the current boiler water temperature. The right side displays the current outdoor temperature.
The default slope of the heating curve is 1.4, and the shift is 20 (or 68 if the display is set to °F).
Refer to the “Operation” section of the B1HA/B1KA Operating Instructions for more detail.
24. Adjusting the Heating Curve Set Point
Displays current set point temperature parameter.
Procedure:
- Tap ▼/▲. The set parameter flashes and "r" will be displayed.
- Use ▼/▲ to select the parameter.
- OK to confirm.
Note: When adjusting this setting, allow time for the system to heat the home to the required temperature.
Default setting: 20 (or 68 if the display is converted to °F).
25. Adjusting the Heating Curve Slope
Changing the slope: The gradient of the heating curves changes.
Procedure:
- Tap MODE.
- Tap ▼/▲ until CONFI flashes.
- Tap OK to acknowledge. "P" is displayed in the left field. The right field flashes.
- Tap ▼/▲ until "12" is set.
- Tap OK to acknowledge. "1" flashes in the left field.
- Tap ▼/▲ until "5" is set.
- Tap OK to acknowledge. "0" or "1" flashes in the right field.
- Tap ▼/▲ to set the gas type, "1" (Liquid Propane) and "0" (Natural Gas).
- Tap OK to acknowledge.
- Turn OFF power, then turn power ON. The parameters are saved.
Heating Curve Slope Values:
- Underfloor heating system: slope 0.2 to 0.8 (displayed as 02 and 08)
- Low temperature heating system: slope 0.8 to 1.6 (displayed as 08 and 16)
- Heating system with boiler water temperature > 167°F (75°C): slope 1.6 to 2.0 (displayed as 16 and 20)
Default setting: 14.
Example Settings:
- Typical Radiant: slope 6 & set point 68
- Typical Baseboard: slope 24 & set point 68
- Typical Fan Coil: slope 8 & set point 95
Refer to the “Operation” section of the B1HA/B1KA Operating Instructions for more detail.
26. Fault Codes
Diagnostics table: Faults with fault display on control unit
| Fault code in display window | System characteristics*1 | Cause | Corrective measures |
|---|---|---|---|
| 0A | Burner blocked | CO limiter (if installed) has responded. CO concentration too high. Gas pressure switch (if installed) has responded. Gas pressure too low. | Check the heating system. Remove the cause of escaping CO. Check the gas supply. |
| 0b | Burner blocked | Low water, pump or flow switch defective | Check water pressure, circulation pump, flow switch. |
| 0C | Burner blocked | Mains voltage too low | Check the power supply. |
| 10 | Constant mode | Outdoor temperature sensor shorted out | Check the optional outdoor temperature sensor and wiring. |
| 18 | Constant mode | Outdoor temperature sensor wire broken | Check the outdoor temperature sensor and wiring. |
| 30 | Burner blocked | Boiler water temperature sensor shorted out | Check the boiler water temperature sensor. |
| 38 | Burner blocked | Boiler water temperature sensor wire broken | Check the boiler water temperature sensor. |
| 50 | No DHW heating | Tank temperature sensor shorted out | Check sensor. |
| 51 | No DHW heating | Outlet temperature sensor shorted out | Check sensor. |
| 52 | Burner blocked | Flow sensor shorted out | Check connections and wire; replace sensor if required. |
| 58 | No DHW heating | Tank temperature sensor wire broken | Check sensor. |
| 59 | No DHW heating | Outlet temperature sensor wire broken | Check the sensor. |
| 5A | Burner blocked | Flow sensor wire broken | Check connections and wire; replace sensor if required. |
| A3 | Burner blocked | Flue gas temperature sensor incorrectly positioned. No flame formation during sensor test. | Position flue gas temperature sensor correctly. Repeat sensor test if necessary. |
| F2 | Burner in fault mode | Fixed high limit tripped | Check heating system water level, circulation pump. Bleed system. Check fixed high limit and cables. Reset control. |
| F3 | Burner in fault mode | Flame signal is already present at burner start | Check ionization electrode and cable. Reset control. |
| F4 | Burner in fault mode | No flame signal is present | Check ignition electrodes and wires. Measure ionization current, check gas pressure, gas valve, ignition, ignition module, condensate drain. Reset control. Check ignition cable resistance (4.5K to 5K ohms). |
| F8 | Burner in fault mode | The combination gas valve closes too late | Check gas valve. Check air and gas flow paths. Reset control. |
| F9 | Burner in fault mode | Blower speed too low at burner start | Check blower, blower cables and supply, blower control. Reset control. |
| FA | Burner in fault mode | Blower not at stand-still | Check blower, blower connecting cables and blower control. Reset control. |
| FC | Burner blocked | Electrical fan control (control unit) faulty | Check fan connecting cable; replace cable or control unit if required. Reset control. |
| Fd | Burner blocked | Burner control unit fault | Check ignition electrodes and cables. Check for strong interference (EMC) field; correct if applicable. Reset control. Replace control unit if fault persists. |
| FF | Burner blocked | Burner control unit fault | Check ignition electrodes and cables. Check for strong interference (EMC) field; correct if applicable. Reset control. Replace control if fault persists. |
| A9 | Regulated operation without OpenTherm device | Communication fault | Check connections and wire; replace OpenTherm device if required. |
| b0 | Burner blocked | Flue gas temperature sensor shorted out | Check sensor. |
| b7 | Emergency mode | Burner control unit fault | Reset boiler control. |
| b8 | Burner blocked | Flue gas temp. sensor wire broken | Check sensor. |
| E3 | Burner in fault mode | Fault in safety chain | Check fixed high limit and cables. Check control unit, replace if required. |
| E5 | Burner blocked | Internal fault | Check ionization electrode and cable. Press reset. |
| F0 | Burner blocked | Internal fault | Replace the control unit. |
| F1 | Burner in fault mode | Maximum flue gas temperature exceeded | Check heating system fill level, circulation pump and bleed system. Reset control. |
Activating boiler pump (bleeding program):
- Close the gas shut-off valve.
- Switch ON the power supply.
- Tap MODE.
- Tap ▼/▲ until CONFI flashes.
- Tap OK to confirm. "P" appears in the left display. The right display flashes.
- Use ▼/▲ to select "12".
- Tap OK to confirm. "1" flashes in the left display.
- Tap OK to confirm. "0" flashes in the right display.
- Use ▼/▲ to select "1".
- Tap OK to confirm. Filling is activated. The boiler circuit pump runs, the 3-way diverter valve moves to its center position. This function terminates automatically after 30 min. or when the ON/OFF switch is switched off.
Refer to the “Operation” section of the B1HA/B1KA Operating Instructions for more detail.
