Viessmann Vitomax HS M75 - 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 M75

Installation Instructions24 pages

Questions and Answers

B
Barbara MartinezAug 15, 2025
What to do if the burner does not start in my Viessmann Vitomax HS M75 Boiler?
- K
  Karen JonesAug 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.
A
Amber RiceAug 18, 2025
Why is my Viessmann Boiler discharging from the safety valve?
- R
  Rachel StewartAug 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.
K
Kathryn BradyAug 21, 2025
What to do if the water level limiter switches off in my Viessmann Boiler?
- A
  Alexandra SalazarAug 21, 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
Mark MurphyAug 25, 2025
How to lower the flue gas temperature in my Viessmann Vitomax HS M75 Boiler?
- A
  angelica41Aug 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.
D
Diana DanielsAug 28, 2025
Why does the water level limiter keep switching off on my Viessmann Boiler?
- C
  Cynthia CastilloAug 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.
J
joseph89Aug 31, 2025
How to fix high water level in my Viessmann Vitomax HS M75?
- A
  Andrea CampbellAug 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
Shelly MatthewsSep 4, 2025
How to prevent oxygen corrosion in my Viessmann Boiler?
- G
  Garrett WeaverSep 4, 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.
A
Allison GarnerSep 7, 2025
Why is there steam knocking in my Viessmann Vitomax HS M75 Boiler's condensate container?
- V
  Vanessa ThomasSep 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.
J
Jose MartinSep 10, 2025
What causes steam hammer inside a Viessmann Vitomax HS M75?
- R
  ryan68Sep 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

Safety Precautions Explained

Explains hazard symbols, target audience, and regulations for safe operation.

Working on the System Safely

Details procedures for safe operation, hot surfaces, ESD, and repairs.

Functions

Detailed Component Functions

Shutdown and Preservation

Water Quality Management

Standard Requirements and Feedwater

Feedwater Specifications and Treatment

Commissioning Process

Commissioning Recommendations and Preparations

Provides guidance and essential checks before initial system startup.

Commissioning Sequence and Functional Checks

Details the step-by-step procedure for system commissioning, including functional checks.

System Monitoring and Faults

Operators Log and Fault Handling

Guides on maintaining the operator's log and responding to operating faults.

Repairs and Inspections

Maintenance and Safety Requirements

Comprehensive System Procedures

System Commissioning Steps

Step-by-step guide for initial system setup and startup, including checks.

Component Removal, Cleaning, and Checks

Procedures for removing components, cleaning, and checking seals and connections.

Burner Adjustment and Calibration

Troubleshooting Guide

Common Faults and Solutions

Identifies common system faults and provides measures to resolve them.

Summary

Safety Instructions

Safety Precautions Explained

Explains hazard symbols, target audience, and regulations for safe operation.

Working on the System Safely

Details procedures for safe operation, hot surfaces, ESD, and repairs.

Functions

Detailed Component Functions

Shutdown and Preservation

Water Quality Management

Standard Requirements and Feedwater

Feedwater Specifications and Treatment

Commissioning Process

Commissioning Recommendations and Preparations

Provides guidance and essential checks before initial system startup.

Commissioning Sequence and Functional Checks

Details the step-by-step procedure for system commissioning, including functional checks.

System Monitoring and Faults

Operators Log and Fault Handling

Guides on maintaining the operator's log and responding to operating faults.

Repairs and Inspections

Maintenance and Safety Requirements

Comprehensive System Procedures

System Commissioning Steps

Step-by-step guide for initial system setup and startup, including checks.

Component Removal, Cleaning, and Checks

Procedures for removing components, cleaning, and checking seals and connections.

Burner Adjustment and Calibration

Troubleshooting Guide

Common Faults and Solutions

Identifies common system faults and provides measures to resolve them.

Viessmann Vitomax HS M75 Specifications

General

Brand	Viessmann
Model	Vitomax HS M75
Category	Boiler
Language	English

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