Detail reference

KORAFLEX Basic FKB

KORAFLEX Basic FKB is an economic variant of trench heater ideal for project solutions. Manufactured from non-lacquered hot-dip galvanized steel and fitted with silver elox U-frames or frames suitable for Cross grilles.

Grilles

Depth [mm]	70, 90, 110 mm
Width [mm]	140, 200, 260, 320 a 420 mm
Length [mm]	800 to 3 000 mm (by 100 mm)
Heat output [W]	from 41 to 1 739 W
Max. operating pressure [MPa]	1.2 MPa
Max. operating temperature [°C]	90 °C
Connecting thread	inner G ½"
Cover grilles

Where a left-hand connection to the heating system is required, rotate the heat exchanger in the trench heater by 180°.

Cross grille – design solutions – the casing mustundergo alternation.
Cross grilles must be ordered together with trench heaters. These trench heaters will be fitted with Cross frame suitable for Cross grille.

Heat output [W] where t1/t2/ti / EN 16430. Measurements shown in mm including U-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
70	140	42	51	61	71	81	91	101	111	121	130	140	150	160	170	180	190	200	210	219	229	239	249	259	1,4629
70	200	76	90	105	120	135	150	165	179	194	209	224	239	254	268	283	298	313	328	342	357	372	387	402	1,4587
70	260	90	108	126	143	161	179	196	214	232	250	267	285	303	320	338	356	373	391	409	426	444	462	480	1,6148
70	320	102	124	146	168	189	211	233	255	276	298	320	342	364	385	407	429	451	472	494	516	538	559	581	1,5550
70	400	131	157	183	208	234	260	286	311	337	363	389	414	440	466	492	517	543	569	595	620	646	672	698	1,5235
90	140	50	62	74	86	98	110	122	134	146	158	170	182	194	206	218	230	242	254	266	278	290	302	314	1,5247
90	200	120	143	167	191	214	238	261	285	308	332	355	379	402	426	449	473	496	520	543	567	590	614	637	1,5373
90	260	153	183	213	243	273	303	333	363	393	423	453	483	513	543	573	603	633	663	693	723	753	783	813	1,5643
90	320	195	236	278	319	361	402	444	485	526	568	609	651	692	733	775	816	858	899	940	982	1023	1065	1106	1,4599
90	400	275	329	383	437	490	544	598	652	706	760	814	868	922	976	1029	1083	1137	1191	1245	1299	1353	1407	1461	1,4607
110	140	55	69	82	95	108	122	135	148	161	174	188	201	214	227	240	254	267	280	293	307	320	333	346	1,4888
110	200	142	170	198	226	254	282	309	337	365	393	421	449	477	505	532	560	588	616	644	672	700	728	755	1,4739
110	260	184	220	257	293	329	365	401	437	473	510	546	582	618	654	690	726	763	799	835	871	907	943	979	1,4385
110	320	237	287	338	388	438	489	539	589	640	690	740	791	841	891	942	992	1042	1093	1143	1193	1244	1294	1344	1,4622
110	400	327	391	455	520	584	648	712	776	840	905	969	1033	1097	1161	1225	1289	1354	1418	1482	1546	1610	1674	1739	1,4569

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

Accessories KORAFLEX FK

TRENCH HEATER COMPONENTS

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 laquered 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, cable length 2.5m or 5m
raised floor structural supports
½" × ½" 90° brass elbow for connection facilitation
10, 12 or 30cm flexible stainless steel hose
strengthened OSB cover for installation

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 U-frame Optional F-frame Optional Cross grille frame (on request)

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 reques)

KORAFLEX BASIC FKB - PRODUCT RANGE

70 mm

90 mm

110 mm

_{Measurements shown in mm}.

Width of trench heaters fitted with a Cross frame are identical to trench heaters fitted with an U-frame.

FK TRENCH HEATER INSTALLATION

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.

Recommended positioning of heat exchangers in trench heaters
Trench heaters should be positioned a maximum of 100mm 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°.

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.

KORAFLEX - Raised floor installations

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. Individual KORAFLEX Pool FKP trench heater casings cannot be combined in this way, and are available in P0 models only.

Connection to heating system KORAFLEX FK

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.

Catalogue KORAFLEX (43,5 MB)
Assembly instructions KORAFLEX - FKO,FKT,FKB
Technical data KORAFLEX FK
Raised floor installations 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: FKB-100/11/26-V1U1P0

KORAFLEX trench heater with natural convection, Basic model, length 100 cm, depth 11 cm, width 26 cm, counter-flow non-lacquered heat exchanger, U-frame, silver elox, right-hand connection to heating system, without lowered face.

KORAFLEX	Convection	Basic		Length/Depth/Width (cm)		Heat exchanger type	Heat exchanger colour	Frame	Frame colour	Connection side	Lowered face
F	K	B	-	100/11/26	-	V	1	U	1	P	0
						V counter-flow P* single-stream 0 without heat exchanger	1 non-lacquered 0 without heat exchanger	U U-frame 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

Basic

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
0 without heat
exchanger

U U-frame
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, depth of 70, 90 and 110 mm only.

Back to list

Contact form

For more information, don't hesitate to contact us.