Viessmann Vitomax HS M93 - User Manual

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Operating and service instructions

for contractors

Viesmann

Vitomax HS

Type M73

Type M75

Type M93

Type M95

High pressure steam boiler

VITOMAX HS

5837984 GB 1/2019

Please keep safe.

Other manuals for Viessmann Vitomax HS M93

Installation Instructions24 pages

Questions and Answers

M
Megan TurnerAug 14, 2025
What to do if the burner does not start in my Viessmann Boiler?
- C
  Caleb BraunAug 15, 2025
  If the Viessmann Boiler's burner doesn't start, first check if the mains isolator is switched ON to ensure voltage is present. If the burner fault indicator is illuminated, press the reset button on the burner control unit. Also, verify the fuel supply line for any obstructions and check the shut-off valves. Finally, examine the safety equipment, in case the safety chain has been activated.
D
dustin11Aug 18, 2025
Why is my Viessmann Vitomax HS M93 Boiler discharging from the safety valve?
- E
  ebyrdAug 18, 2025
  If the Viessmann Boiler's safety valve is discharging, verify that the discharge pressure matches the maximum permissible operating pressure; replace the safety valve if required. Inspect the pressure regulator and pressure limiter adjustments, correcting them if the operating pressure is too high. Clean the valve seat if it's contaminated, and clear any blockages in the water trap pipe.
W
William JacksonAug 21, 2025
What to do if the water level limiter switches off in my Viessmann Boiler?
- B
  brittanyjacksonAug 22, 2025
  If the water level limiter switches off on your Viessmann Boiler, open the shut-off valve in the feedwater line. Also, check the mains water connection to ensure there is feedwater in the feedwater tank. You should also determine the cause of the damage to the water pump and water level controller in accordance with the installation instructions.
M
Melissa FreemanAug 25, 2025
How to lower the flue gas temperature in my Viessmann Vitomax HS M93?
- S
  Summer YorkAug 26, 2025
  If the flue gas temperature is too high in your Viessmann Boiler, clean the boiler to address any contamination on the flue gas and water sides that may be reducing heat transfer. Also, check the burner heating output to ensure that the rated boiler heating output is not exceeded.
M
mikaylanelsonAug 27, 2025
Why does the water level limiter keep switching off on my Viessmann Vitomax HS M93 Boiler?
- D
  daniellethomasAug 28, 2025
  If the water level limiter switches off and you notice severe water level fluctuations in your Viessmann Boiler, drain water from the boiler and feedwater tank, then refill with treated water. Blow down more frequently, and check the water treatment system. Also, check and adapt the electrode length.
D
Douglas LopezAug 31, 2025
How to fix high water level in my Viessmann Boiler?
- G
  Gene ReedAug 31, 2025
  If the water level is too high in your Viessmann Boiler, install a steam trap to ensure the steam distributor above the boiler is adequately drained. Additionally, check the electrode length, in case the water level is set too high.
S
Seth WeberSep 3, 2025
How to prevent oxygen corrosion in my Viessmann Vitomax HS M93?
- B
  bradleythomasSep 3, 2025
  To prevent oxygen corrosion on the water side of your Viessmann Boiler, check the water treatment system and injection system in accordance with VdTÜV guideline if you are topping up with unsuitable water. If the boiler is often taken out of service without being preserved, switch to standby (95 °C) instead of a complete shut down.
S
Shannon OsborneSep 7, 2025
Why is there steam knocking in my Viessmann Vitomax HS M93 Boiler's condensate container?
- C
  Courtney BeckSep 7, 2025
  If you hear steam knocking inside the condensate container or feedwater tank of your Viessmann Boiler, install or clean the check valve (observe the flow direction) because the check valve in the feedwater line might be missing or faulty. Identify and repair any faulty steam trap in the system. Reduce steam pressure, as U-bends might buckle.
M
mcarsonSep 12, 2025
What causes steam hammer inside a Viessmann Vitomax HS M93 Boiler?
- C
  Corey GarciaSep 12, 2025
  If there's steam hammer inside your Viessmann Boiler, connect the feedwater line to the correct connector, ensuring that feedwater is fed in at the feedwater connector.

Summary

Safety instructions

Hazard Symbol Explanation

Explains hazard symbols for safety and environmental protection.

System Operation Safety

Outlines key safety measures for system operation and maintenance tasks.

Information

Authorized Usage

Specifies the authorized applications and limitations for the boiler system.

High Temperature Systems (>110°C)

Outlines requirements and considerations for high-temperature boiler systems.

Shutdown and Preservation

Boiler Shutdown Procedure

Boiler Preservation Techniques

Explains wet and dry preservation techniques for boiler idle periods.

Operational Interruption Guidelines

Water Quality

Standard Water Quality Values

Specifies the standard parameters and limits for boiler feedwater and water quality.

Water Treatment System Requirements

Boiler Water Quality Requirements

Commissioning

Commissioning Recommendations

Covers approvals, expert presence, and reporting for system commissioning.

Commissioning Preparations

Commissioning Sequence Steps

Details the step-by-step process for system startup and functional checks.

Monitoring

Monitoring Recommendations

Operating Fault Handling

Guides on immediate actions, hazard prevention, and shutdown protocols for operating faults.

Repairs and Inspection

Maintenance Procedures

Inspection Guidelines

Troubleshooting

Burner Startup Issues

Diagnoses and provides measures for burner startup failures.

High Flue Gas Temperature

Saturated Steam Production

Summary

Safety instructions

Hazard Symbol Explanation

Explains hazard symbols for safety and environmental protection.

System Operation Safety

Outlines key safety measures for system operation and maintenance tasks.

Information

Authorized Usage

Specifies the authorized applications and limitations for the boiler system.

High Temperature Systems (>110°C)

Outlines requirements and considerations for high-temperature boiler systems.

Shutdown and Preservation

Boiler Shutdown Procedure

Boiler Preservation Techniques

Explains wet and dry preservation techniques for boiler idle periods.

Operational Interruption Guidelines

Water Quality

Standard Water Quality Values

Specifies the standard parameters and limits for boiler feedwater and water quality.

Water Treatment System Requirements

Boiler Water Quality Requirements

Commissioning

Commissioning Recommendations

Covers approvals, expert presence, and reporting for system commissioning.

Commissioning Preparations

Commissioning Sequence Steps

Details the step-by-step process for system startup and functional checks.

Monitoring

Monitoring Recommendations

Operating Fault Handling

Guides on immediate actions, hazard prevention, and shutdown protocols for operating faults.

Repairs and Inspection

Maintenance Procedures

Inspection Guidelines

Troubleshooting

Burner Startup Issues

Diagnoses and provides measures for burner startup failures.

High Flue Gas Temperature

Saturated Steam Production

Viessmann Vitomax HS M93 Specifications

General

Fuel	Natural gas, light fuel oil
Control system	Vitocontrol
Fuel type	Oil / Gas
NOx emissions	Low NOx emissions
Construction	Three-pass boiler
Efficiency	Up to 95%

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