Trench heaters -PKIOC for heating or cooling

• used for heating or cooling
• high heating and cooling output
• two-pipe systems
• stainless steel design Inox AISI 304 for dry environment only
• the narrowest type of compact dimensions
• possibility of control through BMS (Building Management System)
• standard finish Inox (unpainted stainless steel AISI 304)
• the convector use in for dry environment only




PKIOC 11/20              FI 11_20 BOK              PKIOC  13/34                                                            FI 13_34 BOK
Version Economic  

black coated galvanized steel with inner stainless steel case AISI 316, heat exchanger without surface finish

Version Exclusive * custom-made design  

black coated zinc galvanised steel case, black coated exchanger*

Version Inox * custom-made design stainless steel unpainted case AISI 304 stainless steel unpainted case AISI 304, unpainted exchanger (for dry environment only
width including the U/F type frame (mm) 204U/234F 344U/374F
floor case width (mm) 170 298
grid width (mm) 192 332
max. adjustable height (H max. mm) 108–132 133–160
case depth (mm) 108 133
length (L mm) 800 ,1 200, 1 600, 2 000, 2 400, 2 800 1 200, 1 500, 2 000, 2 500, 3 000
exchanger height (mm) 75 75
exchanger width (mm) 75 100
fans impeller diameter (mm) 40 60
connection to the heating system 2× G 1/2" vnitřní 2× G 1/2" vnitřní
case material stainless steel AISI 304 galv. steel, stainless steel 304, 316

PKIOC  11/20  

type                         PKIOC 11/20                         
Width cm                       20                        
Depth cm                       11                        
Length cm   80       120       160       200       240       280    
Noisiness – acoustic pressure 1m dB(A) 0 16,1 23,6 30,5 0 16,4 24,1 30,9 0 16,7 24,4 31,1 0 17,2 25 31,4 0 17,4 25,1 31,7 0 17,7 25,3 31,7
Max. input/voltage DC W/V   5,5/13,5       11/13,5       12/13,5       20/13,5      


Rpm.   Off 1 2 3 Off 1 2 3 Off 1 2 3 Off 1 2 3 Off 1 2 3 Off 1 2 3
Cooling output W  t1°C / hum.%                                                
6/12 °C 26/50 - 151 214 276 - 289 409 529 - 430 609 787 - 572 810 1047 - 713 1009 1304 - 853 1208 1562
Heat output W/EN 442 t1°C                                                
75/65 °C 20 74 542 696 850 142 1037 1332 1627 211 1544 1983 2422 281 2053 2636 3220 350 2558 3285 4013 419 3063 3934 4806

Correction factor kt
for a  variant temperature

difference Δt (K)



Table to




PKIOC 13/34 

type                  PKIOC 13/34                         
Width cm               34                        
Depth cm               13                        
Length cm   120       150       200       250       300    
Noisiness – acoustic pressure 1m dB(A) 0 28,6 33,1 39,3 0 28,9 33,5 39,8 0 29,3 34 40,4 0 29,6 34,4 40,9 0 29,9 34,8 41,4
Max. input/voltage DC W/V   9,5/13,5       14/13,5       18,5/13,5       23/13,5      


Rpm.   Off 1 2 3 Off 1 2 3 Off 1 2 3 Off 1 2 3 Off 1 2 3
Cooling output W  t1°C / hum.%                                        
6/12 °C 26/50 - 481 685 890 - 693 988 1283 - 1046 1492 1937 - 1399 1995 2591 - 1753 2499 3246
Heat output W/EN 442 t1°C                                        
75/65 °C 20 230 1725 2232 2738 331 2486 3216 3946 501 3754 4857 5959 670 5023 6498 7973 839 6291 8138 9986

Correction factor kt

for a variant temperature

difference Δt (K)


Table to



Standard delivery contains


  • galvanized steel case, surface finish RAL 9005 – black
  • inner case (stainless steel AISI 316)
  • Al/Cu heat exchanger with low water content and air vent
  • set of low-energy fans
  • connecting terminal (F Box)
  • 2 temperature switches (heating, cooling)
  • side cover metal sheets in colour
  • anodized Al frame, U profile, in the natural aluminium colour
  • fixing anchors for fastening the convector to the floor
  • a pair of stainless-steel elastic hoses for easy connection
  • chipboard cover plate protecting the heat exchanger from dust and dirt on building site
  • 25 mm height adjustment screws to compensate for the floor unevenness
  • the unit is packed in a durable packaging and with an installation manual

Optional accessories for complete finish

  • Execution Exclusive or Inox
  • colour of the anodized Al frame – natural aluminium, light and dark bronze for F profile or light or dark bronze in the U profile
  • black paint of the heat exchanger
  • shut off valve, thermostatic valve head or thermoelectric drive
  • covering plate with increased rigidity
  • case with noise-absorbing foil (reduction of noisiness by 1 to 3 dB)
  • Standard delivery is without regulation. Regulation must be ordered separately and according to technical parameters.

  • Electrical regulation and regulation elements 

  • Regulation is identical for all OC convectors

Profiles of aluminium frames

 Standard design – U frame

               U RÁMEČEK                                U rámeček

 Standard PK design contains silver U profile. Profile colour is equal with grid colour, for other colours.

Selectable version – F frame

   F RÁMEČEK               F rámeček

When the selectable frame F is ordered, it is attached separately to convector (not installed on convector). Frame colours are identical with aluminium grid colours.

PKIOC 11/20

FI 11_20 BOK




FI 11_20 PUD

* For all manufactured lengths of PKIOC 11/20 the average distance for the connection is 160 mm.
* In case of floor convector PKIOC 11/20 the linear floor grid could not be manufactured as a standard product. Previous consultation is necessary and if possible the convector case is adapted.

PKIOC 13/34

FI 13_34 BOK


FI 13_34 PUD

* In case of floor convector PKIOC 13/34 the linear floor grid could not be manufactured
as a standard product. Previous consultation is necessary and if possible the convector case is adapted


Convector installation – construction part Licon PKIOC

Convector installation – construction recommendations Several general principles must be fulfilled to ensure proper functioning of the convector.
• A properly installed element has the exchanger located further away from the window.
• It is recommended to use the standard stainless-steel hoses with stainless-steel jacketing which always form a part of the delivery (unless recommended otherwise) for interconnecting the exchanger and the distributing pipeline. In practice they provide a better access under the heat exchanger without having to dismantle the heating system, e.g. during cleaning.
• We recommend connecting the heating system with the use of stop valves and a thermostatic valve.
• Always connect the supply of the heat-carrying medium to the heat exchanger's pipe that is further away from the fan. In case of the 34 cm width the OR-J3 heat exchanger is used; the heatcarrying medium enters through one pipe and leaves through another one.
• The PKWOC exchanger is a four pipe unit; one circuit feeds the heating circuit and the other one the cooling circuit.
• Properly installed convector is laid horizontally with the convector's case edges intact and not bent to ensure correct function of the walkable grid and the bleeding of the exchanger possible.
• Correctly installed convector's decorative frame is at the floor level with a margin of +2 mm.
• We recommend to keep the cover plate on the convector for the entire duration of the building work to prevent any dirt falling inside the convector. The standard plate is not walkable, but a plate with increased load bearing capacity can be ordered.
• The fans set is held down to the convector's case using magnets. In case of the stainless steel version the set of fans will be mounted using dry zips. This system allows you to remove the fans from the convector during the installation to avoid their damage or soiling, etc. They can be easily taken out for cleaning also during standard operation.
•The floor convector must be firmly set in the floor. The setting screws are only used for horizontal levelling of the convector case.
• Before concreting the convector must be fixed to the floor using anchoring screws that will prevent vertical shifting of the convector during subsequent pouring of concrete. When the concrete is poured the convector can be loaded vertically. During concreting the convector must be cross-braced to prevent deformation of the case. When pouring other material (e. g. anhydride) seal thoroughly all openings of the convector to prevent it from flooding.
• The convector's PKBOC setting screw consists of a flag used as a ground anchor. This type does not contain anchors.
• We recommend the fixing and sound proof insulation to be done in such a way that will allow a thin concrete to be poured to the convector's bottom and its sides. Optimal noise reduction is achieved by direct embedding of the convector in concrete.
• Installing the fan convector in free space can result in increased noise, therefore we recommend to order a case with noise absorbing foil.
• Installation into double layer floors is described later.
• Cooled convectors (PKIOC, PKWOC) have built-in as standard a water (condensate) drain. During the installation do not forget to interconnect the case at the bottom of the convector with a pipeline with guaranteed gradient for wastewater or condensate removal. We recommend to equip the drain with an odour trap.
• Convectors PKBOC are intended for use in swimming pool areas. The separation barrier is used to capture water from the pool, but cannot serve as the standard pool water overflow. This part is always placed closer to the pool. The heating part with the exchanger and fans must be always further away from the pool. The convector is provided with drainage holes in each corner, 2×. Installation, operation and maintenance of this equipment require special conditions. Please read them thoroughly on our website or in the manual.

Caution: Floor convector PKBOC with forced convection must be positioned so as to prevent even short term flooding of the section fitted with the motor and the fans.

Possibilities of convector incorporation by floor types

  1. Installation by embedding in concrete
  2. Installation in low double floor
  3. Installation in raised double floor

Dimensions of the mounting holes

Weights and water volumes

Type 11/20 13/34
steel kg/linear meter  -  13
stainless steel kg/1 linear meter 6,4 10,9
l/1 linear meter 0,5 0,56

 Assembly instruction 24-PKOC, PKIOC, PKWOC
 Assembly instruction Regulace_24V
Assembly instruction PM
Ordering codes PKIOC
Connection diagram
Regulation and acoustics

12-V convector regulation - termination of sale
Starting from March 2020 we terminate production and sale of 12-V convector regulation. This type of regulation can by fully replaced by 24-V version. This regulation is safe and fulfills  all requirements and functions  our convectors demand.
Thank you for your understanding.

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