Detail reference

KORAFLEX Thin FKT

KORAFLEX Thin FKT is a trench heater with lowest unit height. It is particularly suited to interiors with low floor depth, and as a secondary heating unit for shielding cold from French windows.

ECONOMIC version – basic version, black lacquered galvanized steel casing, non-lacquered heat exchanger
EXCLUSIVE version – black lacquered galvanized steel casing, RAL 9005 black lacquered heat exchanger

Grilles

ECONOMIC version	basic version, black lacquered galvanized steel casing, non-lacquered heat exchanger
EXCLUSIVE version	black lacquered galvanized steel casing, RAL 9005 black lacquered heat exchanger
Depth [mm]	60 mm
Width [mm]	140, 200, 260, 320 mm
Length [mm]	800 to 3 000 mm (by 100 mm)
Heat output [W]	from 43 to 644 W
Max. operating pressure [MPa]	1.2 MPa
Max. operating temperature [°C]	90 °C
Connecting thread	inner G ½"
Cover grilles Thin trench heaters may only be fitted with Thin grilles, and after casing modifications Cross grilles. No other grilles are available for this range.

Where a left-hand connection to the heating system is required, rotate the heat exchanger in the trench heater by 180°.
The design of trench heater casing does not allow substituting Thin and Cross grilles after ordering.

Note, please, that grilles must be ordered together with the trench heaters, as the casing must undergo alternation.

Thin grilles are not available in linear design.

Heat output [W] where t1/t2/ti / EN 16430. Measurements shown in mm including Thin-frame.

Input temperature [°C]

Output temperature [°C]

Air temperature [°C]

ΔT

ΔT = 50 °C		Length [mm]																							Temperature exponent
Height [mm]	Width [mm]	800	900	1000	1100	1200	1300	1400	1500	1600	1700	1800	1900	2000	2100	2200	2300	2400	2500	2600	2700	2800	2900	3000	Temperature exponent
60	140	43	53	63	73	83	93	104	114	124	134	144	154	164	175	185	195	205	215	225	235	246	256	266	1,3030
70	200	87	105	122	139	156	173	190	207	224	242	259	276	293	310	327	344	362	379	396	413	430	447	464	1,5168
70	260	100	120	139	159	179	198	218	238	257	277	296	316	336	355	375	395	414	434	454	473	493	512	532	1,7953
70	320	114	138	162	186	210	234	258	282	306	331	355	379	403	427	451	475	499	523	548	572	596	620	644	1,6785

Standard contents

RAL 9005 black laquered galvanized steel casing
Economic – non-lacquered Al/Cu heat exchanger with bleed valve
Exclusive – RAL 9005 black lacquered Al/Cu heat exchanger with bleed valve
aluminium T-frame for Thin grille, 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

Thin or Cross grille
Cross grille – design solutions – necessary to order together with trench heater
silver, light/dark bronze and black elox or RAL colour chart lacquered aluminium frame for Thin grille
thermostatic head with incorporated control and immersion remote sensor
24V DC power supply
24V DC or 230V AC room thermostat for regulation
24V DC or 230V AC thermoelectric actuator, cable length 2.5m or 5m
lockshield, thermostatic valve
½" × ½" 90° brass elbow for connection facilitation
10, 12 or 30 cm flexible stainless steel hose
strengthened OSB cover for installation purposes

TRENCH HEATER COMPONENTS

1black laquered galvanized steel casing

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

FRAMES

Standard Thin grille frame Optional Cross grille frame (upon request)

Suitable grilles

KORAFLEX THIN FKT - PRODUCT RANGE DEPTH 60 mm

Typ 60/140	Typ 60/200

Typ 60/260	Typ 60/320

Measurements shown in mm. The given widths of trench heaters are identical for both models fitted with Thin or Cross grille frames.

FK TRENCH HEATER INSTALLATION

Construction recommendations

To ensure correct operation, it is essential that the following principles are respected.

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).
The maximum recommended distance of the trench heater from the wall/window is 100 mm.
The size of the trough in the floor for thrench heater installation should be at least 100 mm bigger (both in length and width) than the convector.
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.
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.
Using anchors will extend the bottom width of the trench heater by 42 mm from each side.
While pouring concrete, the trench heater may be weighed down.
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.
While pouring concrete or anhydrite it is essential to seal all connection openings to prevent leakage.
Where the trench heater is not concreted in, floor supports are recommended to use to incorporate the trench heater into a raised floor. Standard trench heater models are not self-supporting.
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.
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.
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.

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 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.

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

Alterations to technical specifications reserved

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 heaters are fitted as standard with right-hand connections to the heating system; a left-hand connection is achieved simply by rotating the heat exchanger 180°.

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.

Catalogue KORAFLEX (43,5 MB)
Assembly instructions KORAFLEX - FKO,FKT,FKB,
Technical data KORAFLEX FK
Connection to heating system KORAFLEX FK
Accessories KORAFLEX FK
Pressure losses KORAFLEX FK
Temperature gradient conversions KORAFLEX FK

Licon Heat - BIM data (Building Information Modeling)

ORDER CODE

Example order code: FKT-100/06/20-V1T1P0

KORAFLEX trench heater with natural convection, Thin model, length 100 cm, depth 6 cm, width 20 cm, non-lacquered heat exchanger, T-frame for Thin grille, silver elox, right-hand connection to heating system, without lowered face.

KORAFLEX	Convection	Thin		Length/Depth/Width (cm)		Heat exchanger type	Heat exchanger colour	Frame	Frame colour	Connection side	Lowered face
F	K	T	-	100/11/26	-	V	1	T	1	P	0
						V counter-flow P* single-stream 0 without heat exchanger	1 non-lacquered 5 RAL 9005 9 other colour RAL 0 without heat exchanger	T for Thin grille C for Cross grille 0 without frame	1 silver elox 2 dark bronze elox 3 light bronze elox 5 black elox 9 other RAL colour 0 without frame	right	0 without lowered face 1 lower face – input side 2 lower face – opposite input side 3 both sides lower

KORAFLEX

Convection

Thin

Length/Depth/Width (cm)

Heat exchanger
type

Heat exchanger
colour

Frame

Frame colour

Connection
side

Lowered
face

100/11/26

V counter-flow
P* single-stream
0 without heat
exchanger

1 non-lacquered
5 RAL 9005
9 other colour RAL
0 without heat
exchanger

T for Thin grille
C for Cross grille
0 without frame

1 silver elox
2 dark bronze elox
3 light bronze elox

5 black elox
9 other RAL colour
0 without frame

right

0 without lowered face
1 lower face – input side
2 lower face – opposite input side
3 both sides lower

P* – single-stream heat exchangers are fitted as standard in trench heaters 140 mm wide.

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