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Danfoss Termix VVX-I - User Manual

Danfoss Termix VVX-I
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InstallationGuide
TermixVVX-I
1.0TableofContents
1.0TableofContents.............................................1
2.0Functionaldescription......................................2
3.0Safetynotes.....................................................3
3.1SafetyNotesgeneral............................................3
4.0Mounting........................................................4
4.1Mounting...........................................................4
4.2Start-up..............................................................6
4.3Electricalconnections.............................................7
5.0Design.............................................................8
5.1Design...............................................................8
5.2Schematicdiagram................................................9
6.0Controls..........................................................10
6.1Heatingcircuit......................................................10
6.2DHWtemperaturecontrol........................................14
6.3Other.................................................................14
6.4Extras................................................................16
6.5Maintenance........................................................16
7.0Troubleshooting..............................................17
7.1Troubleshootingingeneral......................................17
7.2TroubleshootingDHW............................................17
7.3TroubleshootingHE...............................................18
7.4Disposal.............................................................19
8.0Declaration......................................................23
8.1Declarationofconformity........................................23
DanfossDistrictEnergy
VI.EH.G3.02/LUK40440
DEN-GT
1

Questions and Answers

  • S
    scottwagnerAug 6, 2025
    What to do if hot water is only in some taps of my Danfoss Termix VVX-I Water Heater?
    • J
      jessicahernandezAug 6, 2025
      If you're experiencing hot water in some taps but not others with your Danfoss Water Heater, it could be due to cold water mixing with the domestic hot water (DHW), possibly from a defective thermostatic mixing valve, which would need checking or replacement. Another cause could be a defective or clogged non-return valve on the circulation valve, which would need replacement or cleaning.
  • M
    Mary Davis MDAug 11, 2025
    Why does the temperature drop when tapping water from my Danfoss Water Heater?
    • M
      Michael JohnsAug 11, 2025
      A temperature drop during tapping from your Danfoss Water Heater can occur if there's scaling on the plate heat exchanger, in which case you should replace or rinse it out. Alternatively, the DHW flow might be larger than the substation was designed for, so try reducing the DHW flow.
  • K
    Kimberly DiazAug 16, 2025
    How to fix too high tap water temperature on my Danfoss Water Heater?
    • J
      Jennifer LambAug 16, 2025
      If the tap temperature is too high on your Danfoss Water Heater, especially with a high DHW tap load, the thermostatic valve might be adjusted to too high a level. Check and adjust the setting of the thermostatic valve.
  • E
    Elizabeth MorrisonAug 21, 2025
    What to do if thermostatic control valve does not close on Danfoss Termix VVX-I?
    • G
      gina18Aug 21, 2025
      If the thermostatic control valve on your Danfoss Water Heater isn't closing, the temperature difference between the DH supply and the DHW set point might be too low. Try lowering the set point temperature or increasing the DH supply temperature.
  • E
    Erica CoxAug 27, 2025
    How to increase the idle temperature on my Danfoss Water Heater?
    • L
      Laura PowellAug 27, 2025
      If the idle temperature is too low on your Danfoss Water Heater (for stations equipped with IHPT), the set point might be too low. Turn the thermostat in the (+) direction to increase it.
  • R
    randy59Oct 31, 2025
    Why is there too little or no DHW from my Danfoss Water Heater?
    • D
      Debbie CochranOct 31, 2025
      There could be several reasons for too little or no domestic hot water (DHW) from your Danfoss Water Heater. The strainer in the supply or return line might be clogged, requiring cleaning. The DHW circulation pump may be out of order or set too low, so check the circulation pump. A non-return valve could be defective or clogged, needing replacement or cleaning. There might be no electricity, so check the power supply. The automatic controls could be set incorrectly; refer to the enclosed instructions for the electronic controller to adjust the DHW settings. The plate heat exchanger might have scaling, requiring replacement or rinsing. A motorized valve could be defective, needing a check (using the manual function) or replacement. The temperature sensors or the controller itself could be d...

Summary

Safety Notes

General Safety Instructions

Covers critical safety warnings, authorized personnel, pressure, temperature, and connections.

Mounting and Installation

Start-up Procedures

Indirect Heating Start-up

Step-by-step guide for filling, pressure checks, and system heating.

Start-up Operations

Instructions for re-tightening connections and pump settings during start-up.

Electrical Connections

Electrical Connection Guidelines

Covers safety notes, voltage, disconnection, sensor placement, and authorized electricians.

Controls and Settings

Heating Circuit Controls

Details differential pressure controller, HE temperature control, and RAVK controller settings.

Thermostatic Temperature Adjustment

Explains how to adjust temperature settings using thermostatic controllers.

DHW Temperature Control

DHW Temperature Adjustment

Guidance on adjusting DHW temperature and using the IHPT 180 controller.

Other Components

Maintenance

Routine Maintenance and Inspections

Outlines recommended inspection points like strainers, meters, temperatures, and connections.

Maintenance Personnel Requirement

Specifies that maintenance must be performed by qualified and authorized personnel.

Troubleshooting

Danfoss Termix VVX-I Specifications

General IconGeneral
ControlThermostatic control
Heat exchanger materialStainless steel
Maximum working pressure10 bar
ApplicationDomestic hot water preparation
Connection sizes3/4 inch
Capacity rangeVaries depending on model. Consult specific model datasheet for exact capacity range.

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