Standard contents -
hot-dip galvanized steel casing, non-lacquered -
non-lacquered Al/Cu heat exchanger with bleed valve -
aluminium U-frame, silver elox -
metal cover plate -
levelling set screws and 4 anchors -
spacers for correct installation and concreting -
hardboard cover to protect trench heater from contamination -
durable packaging, installation instructions | Optional accessories -
Choice of grilles -
Cross grille – design solutions – necessary to order together with trench heater -
light/dark bronze and black elox or RAL colour chart lacquered aluminium U-frame -
silver, light/dark bronze and black elox or RAL colour chart lacquered aluminium F-frame -
thermostatic head with incorporated control and immersion remote sensor -
lockshield, thermostatic valve -
24V DC power supply -
24V DC or 230V AC room thermostat for regulation -
24V DC or 230V AC thermoelectric actuator -
raised floor structural supports -
½" × ½" 90° brass elbow for connection facilitation -
flexible stainless steel hose -
strengthened OSB cover for installation |
TRENCH HEATER COMPONENTS
 | 1hot-dip galvanized steel casing, non-lacquered 2choice of grille (please order separately) 3choice of aluminium frame 4Al/Cu heat exchanger 54 anchors 6levelling set screws 7metal cover plate 8brackets 9spacers for correct installation and concretin |
Suitable grilles
| Roll-up aluminium silver | Linear aluminium silver | Roll-up aluminium dark bronze
| Linear aluminium dark bronze 
|
| Roll-up aluminium light bronze 
| Linear aluminium light bronze 
| Roll-up aluminium black elox - NEWS  | Linear aluminium black elox - NEWS  |
| Roll-up steel | Linear steel | Roll-up stainless steel | Linear stainless steel |
| Roll-up natural / lacquer beech 
| Roll-up natural / lacquer oak 
| Roll-up natural / lacquer mahogany
(upon request)  | Cross (upon request) |
Frames
| U-frame | F-frame | Cross frame - Lowered
casing edge |
 |  |  |
Decorative U-shaped and F-shaped frames are available as standard in aluminium with silver, black, dark bronze or light bronze elox finishes. U-frame and Cross frames are available also in black elox. Frames may also be lacquered (powder coated) using colours from the RAL colour chart. Frames are in every case supplied as a component of trench heaters, and the type required must be specified when ordering in the Order Code.
FK TRENCH HEATER INSTALLATION
Construction recommendations
To ensure correct operation, it is essential that the following principles are respected.
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Trench heaters must be installed horizontally with the heat exchanger on the window side. For the grille to function correctly, the upper edge of the casing must be straight and level (not buckled or bent).
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The maximum recommended distance of the trench heater from the wall/window is 100 mm.
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The size of the trough in the floor for the trench heater installation should be at least 100 mm bigger (both in length and width) than the convector.
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We recommend connecting the trench heater to the heating system using a lockshield and thermostatic valve. The heat exchanger connection is by an inner G½ thread. Following connection to the heating system, bleed and carry out a pressure test.
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When concreting, the trench heater must be levelled using the set screws provided and fastened to the floor using the anchors provided. The anchors keep the trench heater in place while pouring concrete.
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Using anchors will extend the bottom width of the trench heater by 42 mm from each side.
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While pouring concrete, the trench heater may be weighed down.
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While pouring concrete it is particularly important to brace the trench heater to prevent longitudinal buckling. Trench heaters are fitted with spacers for this purpose. (Please note: FKP models as standard are, however, not equipped with spacers.) Following concreting, these spacers are easily removed.
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While pouring concrete or anhydrite it is essential to seal all connection openings to prevent leakage.
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Where the trench heater is not concreted in, floor supports are recommended to be used to incorporate the trench heater into a raised floor. Standard trench heater models are not self-supporting.
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We recommend insulating the outer side of the trench heater casing along the length of the heat exchanger with polystyrene to prevent heat loss into the floor.
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To avoid contaminating the trench heater, we recommend maintaining the protective hardboard cover in place during construction work. The board, which is included in the standard contents, is not suitable for walking on and serves solely to protect the trench heater from contamination during installation. Strengthened OSB covers for installation purposes are available as option extras.
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Trench heaters fitted with stainless steel casings installed in humid environments – marked KORALEX Pool FKP – are equipped as standard with overflow drains. During installation, the pipe at the bottom of the trench heater must be connected to piping with sufficient gradient to drain overflow water. We recommend installing a U-bend to prevent odour.
Recommended positioning of heat exchangers in trench heaters
• Trench heaters should be positioned a maximum of 100 mm from windows. In order to achieve maximum performance, the recommended position for heat exchangers in the trench heater is always on the window side. This results in natural air flow, whereby warm air rises and cool air is drawn into the trench heater. In this way, cool air at the window is screened and the air in the room is heated.
TRENCH HEATER INSTALLATION
1 - trench heater with natural convection, 2 - heat exchanger, 3 - grille, 4 - U-frame, 5 - F-frame, 6 - set screws, 7 - anchors, 8 - up to 300mm deep dividing partition, 9 - window, 10 - floor level, 11 - grout,
12 - expansion joint, 13 - insulation, 14 - concrete filler, 15 - sub-floor
Raised floor installations
• Structural supports for raised floor trench heater installations offer stable and effective solutions. Structural supports are manufactured from non-lacquered steel and are suitable for raised floors of a depth of up to 500 mm. Structural supports are suitable for
Optimal FKO and
Basic FKB models.
Supports must be ordered together with trench heaters due to structural alterations to convector casings! Components of several types of raised floor support are integral parts of the trench heater body.
Trench heater multiple installations
Casing types according to water connections and lowered sides for multiple installations
• Lowered trench heater casing sides are used where invisible connections are desired between trench heaters (multiple trench heaters around a room, eg. in administrative buildings, restaurants, hotels, etc.). When ordering grilles, care must be taken to include information in the order code that the grilles required are to be used with trench heaters with lowered faces.
Heating
Natural convection
Low energy consumption
