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Commercial dehumidifier TTK 655 S
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  2. Products ‑ HighPerformance
  3. Dehumidification
  4. Condensation dehumidifiers, mobile
  5. Commercial dehumidifiers of the TTK‑S series
  6. TTK 655 S

Commercial dehumidifier TTK 655 S

The show piece of the Trotec standard series

Commercial dehumidifier TTK 655 S

Standard at Trotec, but far from being a matter of course everywhere

The top model of our commercial dehumidifier standard series is truly outstanding in every respect when compared to the competition:

The TTK 655 S can condense up to 100 litres per day. That is more than 4 litres per hour! This is made possible by a perfect cooperation of a high-performance heat exchange and fan system which can circulate and dehumidify air flow rates of 925 m³/h. The powerful 1.9 kW compressor ensures a high dehumidification capacity in large rooms, even at room temperatures below 10 °C – and the high-quality hot gas automatic defrost of the TTK 655 S guarantees a much more efficient dehumidification performance without pausing on a time interval during which no defrosting occurs.

"Dry-ve time music" – listen to it play...

Use it for construction drying today and clearing water damage tomorrow – common changes of site and use in rough construction site conditions are no problem for this condenser dryer: The rotary compressor of the TTK 655 S not only makes it possible to transport it just about anywhere, they also allow you to start the dehumidifier immediately after positioning. Transport is quick and easy thanks to the ergonomic construction and carriage design with a bar handle and large wheels. Uneven terrain and stairs are no problem. And the non-marking rubber wheels of the TTK 655 S leave no marks on your floorboards or other sensitive flooring indoors. To prevent hazardous dust or moisture from gathering on the electronics, not only the electronic components of the dehumidifier, but also all other components of the TTK 655 S are safely enclosed and attractively combined in the practice-optimized German industrial design - protected design patent.

Commercial dehumidifier TTK 655 S
Commercial dehumidifier TTK 655 S
Commercial dehumidifier TTK 655 S

Investment protection for your drying devices

Particularly during construction drying operations in summer or when drying water damages, it is very likely that climate conditions arise which may significantly shorten the lifetime of condenser dryers – regardless of the make. We as manufacturer care about the fact that for process-related reasons your condenser dryers often have to be replaced much too soon, hence we have prepared a valuable practical recommendation relating to the investment protection of your drying devices. Click here to find out more ...

Technical construction drying

Did you know that every construction dryer is at the same time a commercial dehumidifier, but that not every commercial dehumidifier is automatically a real construction dryer? Here you can find out the reasons for this, and why hot gas defrosting makes the decisive difference ...

Environmentally friendly refrigerant R-454C

Hydrofluorolefin (R-454C) as environmentally friendly refrigerant in dehumidifiers

Every year, several million tonnes of environmentally harmful CO2 emissions (greenhouse gases) are emitted into the air by synthetic refrigerants. For this reason, the utilization of alternative refrigerants has become one of our key objectives. By using hydrofluorolefin (R-454C) as refrigerant, this dehumidifier makes a valuable contribution to protecting our climate.

The natural refrigerant hydrofluorolefin (R-454C) is an organic compound belonging to the group of hydrocarbons. Unlike synthetic refrigerants the environmentally friendly hydrofluorolefin (R-454C) comes with neither ozone depletion potential (ODP = 0) nor a noteworthy greenhouse effect (GWP = 146).

Additional bonus for the environment: Owing to its excellent thermodynamic properties, hydrofluorolefin (R-454C) is a particularly energy-efficient refrigerant thereby additionally reducing your energy costs. 

TTK 655 S – special equipment features

Clearly arranged control panel – protected by protective bars.
Clearly arranged control panel – protected by protective bars.
Optionally available MID operating hours counter

The sophisticated technology of the TTK 655 S, which can be controlled by a hygrostat, requires only a few settings, which can be made on a central control panel in a time-saving manner. To protect the operating elements, the control panel is safely installed between two protective bars.

All operating elements at a glance:

  1. Bars protecting the operating elements
  2. Operating hours counter integrated as standard
  3. Optionally also available as dual counter for operating hours and energy consumption (MID-compliant)
  4. Dehumidification performance selection switch
  5. Compressor overheating protection indicator
The bar handle for transport of the TTK 655 S can be adjusted in height, which means that the handle's position can be adjusted for space-saving storage.
Height-adjustable bar handle for transport
The bar handle for transport of the TTK 655 S can be adjusted in height, which means that the handle's position can be adjusted for space-saving storage.
Height-adjustable bar handle for transport
Two stacking grooves make it possible to stack equally sized TTK S commercial dehumidifiers stably to save space.
Stackable to save space
Development, design, production: 100 % Trotec. The robust carriage design of the TTK 655 S illustrates practice-optimised German industrial design, protected as design patent.
Robust design from EU high-quality manufacturing

Active value retention thanks to integrated compressor heating protection with automatic switch-off function

In drying applications with extremely high humidity levels and simultaneously high temperatures – for instance during water damage restoration – refrigerant dryers are quickly brought to the limits of their capacity (red range). This is where the catchy "rule of 35" applies: drying water damages with more than 35 degrees reduces the lifetime of the dryer to less than 35 %!

This is however not a question of component quality, but pure physics, which applies to all refrigerant dryers on the market regardless of the manufacturer.

Whilst at a moderate humidity level of about 70 % RH most professional condenser dryers can operate in temperatures of up to 35 °C without difficulty, very high humidity values at a simultaneously high room temperature cause considerably more energy to be fed to the humid room air, which then also has to be "worked off" by the refrigerant.

Consequently, the refrigerant pressure in the system is increased enormously leading to destructive load on the compressor.

To be sure, the dehumidifiers will at first continue to operate, but noticeably above their limit "deep in the dark red range", resulting in an extremely shortened remaining lifetime.

All the same, there is no way around the application of a condenser dryer for such drying tasks – desiccant dehumidifiers need considerably more energy to achieve the same level of drying performance and are therefore not a reasonable alternative, especially in terms of economics.

Integrated compressor heating protection

This is why the commercial dehumidifiers of the TTK-S series have an integrated compressor heating protection ensuring active value retention of your devices:

Sensors permanently monitor the thermal load of the compressor. If the temperature is within the defined operating range, the integrated heating protection indicator emits long pulses to indicate that the dehumidifier is operating ideally.

As soon as the temperature exceed the critical threshold of 35 °C, the automatic function switches the compressor off in order to protect it while the fan keeps on running. The compressor is automatically activated again once the temperature falls below the 35 °C threshold.

This protection not only significantly extends the lifetime of your dehumidifiers, it also prevents thermal damages to materials located in the room and the building structure.

A few practical benefits:

  • Development, design, production: 100 % Trotec
  • High dehumidification performance even at low temperatures
  • Maximum protection against dust and moisture for all electrical components
  • Compressor overheating protection with automatic switch-off function
  • Extremely maintenance-friendly design
  • Portable and easily stored anywhere thanks to its rotary compressor
  • Practical stacking groove for stable, space-saving storage and transport
  • Stackable with equally dimensioned models
  • MID-compliant dual counter for operating and kilowatt hours
  • optionally available
  • Practice-optimised German industrial design — protected design patent

Plug-in installation condensate pump available as accessory

Accessory tip:

Installation condensate pump for continuous operation

Suitable for all TTK-S models, a plug-in condensate pump is also optionally available, which can be installed very easily instead of the collection container and allows for automatic condensate discharge via the 5-m drain hose supplied. With a pump performance up to a distance of 50 m and a maximum delivery head of 4.3 metres, this pump is ideally suitable for longer unattended dry keeping applications in continuous operation – just add it to your order right away!

Proper energy billing for existing equipment without meters?

You're using this or another electrical appliance without MID-compliant energy consumption meter of which you have to report the current consumption to insurance companies? Then the BX50 MID is the perfect solution. Just install it between the device and a fixed socket – done!

Fan assistance for construction drying

Fan assistance

Quicker construction drying by air circulation

The drying time can be reduced by half if construction dryers and fans are combined. In doing this, each dryer is supplemented with a fan, which significantly improves the drying performance and thus also the duration of the drying process.

The increased air circulation results in a quicker evaporation of the humidity, for the higher the flow rate at the material surface, the sooner will the drying process be completed.
The axial fans of the TTV series and TTV-S series are especially suitable to provide assistance with regard to the drying process.

Protective cover

A handy protective cover is optionally available for all commercial dehumidifiers of the TTK-S series.

This way, weather conditions, dust etc. can no longer affect the dehumidifier TTK 655 S.


Further information can be found here.

TTK-S series – convenient protective covers
Commercial dehumidifiers of the TTK-S series

All Commercial dehumidifiers of the TTK-S series in direct comparison:

To find the Commercial dehumidifier of the TTK-S series which exactly meets your requirements, please consult the concise overview of all Commercial dehumidifiers of the TTK-S series from Trotec, which we're providing to you here so that you can compare them directly to each other.

Models which you do not wish to include in your comparison can be easily dismissed with only one click.

Technical data by comparison


Luftentfeuchter TTK 655 S show in Trotec online shop

Technical data

Technical data
General information
  Article number
Dehumidification performance
  At 20 °C / 60 % RH [l/24h] 44
  At 30 °C / 80 % RH [l/24h] 91
  Max. [l/24h] 100
Air flow rate
  Level Max. [m³/h] 925
Recommended room size construction drying
Recommended room size dry keeping
Ambient conditions
  Min. temperature range [°C] 5
  Max. temperature range [°C] 32
  Min. humidity range [% RH] 50
  Max. humidity range [% RH] 90
Electrical values
  Mains connection 220 - 240 V, 50 Hz
  Nominal current consumption [A] 9.5
  Power input [kW] 2.1
  Recommended fusing [A] 16
Electric connection
  Connection plug CEE 7/7
  Cable length [m] 3
  Rotary piston compressor
  refrigerant R-454C
  Amount of refrigerant [g] 1,050
  GWP factor 146
  CO2 equivalent 0.15 t
  Pressure suction side [MPa] 0.6
  Pressure outlet side [MPa] 2.8
  Max. permissible pressure [Mpa] 3
Sound values
  Distance 1 m [dB(A)] 56
Functions and features
  Automatic fault diagnosis system
  Automatic switch-off
  Operating button for draining residual water
  Auto restart function
  Connection for external condensate drain
  Memory function
  Fan rundown function
  Length (packaging excluded) [mm] 620
  Width (packaging excluded) [mm] 515
  Height (packaging excluded) [mm] 858
  (packaging excluded) [kg] 55
Equipment, features and functions
Automatic defrost system
  Hot gas
Automatic dehumidification
  Non-stop dehumidification
  Analogue hygrostat
  stages 1
Condensate tank monitoring
  Container available
  Overflow protection with automatic switch-off
  Filling level warning light to indicate a full water tank
Room air filter
  Readily accessible
Operating hours counter
  Operating hours counter
  Power meter
  Carry/transport handle(s)
  Non-marking full-rubber wheels
  Adjustable bar handle
  Carriage design
Condensate drain
  Hose connection possible
  Hose included in the scope of delivery
  Condensate pump
  Recommended hose size [mm] 15
Control panel
  Protective bar
Shelf life
Housing design
  Steel coated

 standard equipment

 optionally available

 not available



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