KORAFLEX Pool FKP

pool design

KORAFLEX Pool FKP is manufactured from AISI 316 stainless steel and is ideal for humid environments. The Pool convector is finished with a hem, therefore no frames can be fitted.

Unsuitable for saltwater pools.

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Technical data Demand

Heating
Natural convection
Pool solution

Depth [mm]	90, 110 mm
Width [mm]	200, 260, 320, 400 mm
Length [mm]	800 to 3 000 mm (by 100 mm)
Heat output [W]	from 120 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°. Individual KORAFLEX Pool trench heater casings can not be combined into multiple series, and are manufactured solely as P0 models, frame substituted with hem, with counter-flow heat exchangers. Where a linear grille is selected, technical consultation is necessary, as the casing may need to undergo alteration. Linear grilles must be ordered together with trench heaters.

Heat output [W] where t₁/t₂/t_i EN 442. Measurements shown in mm, including hem.

Inlet temperature in °C

Outlet temperature in °C

Air temperature in °C

ΔT

ΔT = 50 °C		Length [mm]																							Temperature exponent
Depth [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
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

AISI 316 stainless steel casing, non-lacquered

Al/Cu RAL 9006 grey lacquered heat exchanger with bleed valve

frame substituted by casing edges finished with hem

AISI 316 stainless steel cover plate

levelling set screws and 4 anchors

hardboard cover to protect trench heater from contamination

durable packaging, installation instructions

Optional accessories

aluminium cover grille of your choice suitable for FKP

regulating valve set, angle or straight

thermostatic valve, angle, straight or axial

thermostatic pressure-independent valve, angle, straight or axial

brass elbow ½" × ½" 90°

stainless steel flexible hoses

thermoelectric actuator TEP 230 or TEP 24

SIEMENS thermostat RAA21 or RDE 100.1

thermostatic head with capillary tube

24 V DC power supply unit

OSB cover board with increased stiffness for installation purposes

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	Linear aluminium black elox

HEM FINISHING

KORAFLEX Pool FKP trench heaters are suitable for installation in humid environments. Fitted with built-in drainage and a sloping base. However, these trench heaters are not watertight and must not be flooded for long periods. For ideal operating conditions, we recommend using water with a pH of 7.2 – 7.6, with a maximum chlorine content of 1mg/l. Changes in these values – in particular lower pH values – will result in more aggressive water and corrosion of non-stainless steel components. Pool trench heaters installed in humid environments must be cleaned regularly with clean water and dried thoroughly. In case of visible calcareous deposits or oxidation, use a stainless steel cleaner followed by a suitable metal treatment product. For long-term satisfaction, it is essential that basic maintenance of the stainless steel components is carried out. Further information can be found in the installation manual and Operating and warranty conditions, available to download at websites.

FK TRENCH HEATER INSTALLATION

Construction recommendations

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

A properly installed trench heater must be positioned horizontally, with the heat exchanger oriented towards the window. The trench heater casing must have straight, non-deformed upper edges to ensure correct operation of the cover grille.

Installation of the trench heater is possible
• in a concrete floor (standard construction solution)

• in a plinth – for renovations or additional modifications
• in raised floors – using special supports designed for this purpose - For KORAFLEX Pool (FKP, FVP) installation of raised floor supports is not recommended for design reasons.

In all cases, it is necessary to anchor the trench heater firmly to prevent it from being stepped on and to ensure that all technical installation requirements are met. We recommend leaving the cover plate in place throughout the construction work to prevent contamination of the trench heater’s internal space. A non-walkable hardboard cover is supplied as
standard for basic protection. For installation purposes, an OSB cover with increased rigidity can be ordered as an optional accessory.

The recommended installation distance of the trench heater from the window / wall is max. 100 mm.
The installation opening should be at least 100 mm larger than the convector dimensions in both length and width.
For trench heaters with natural convection (without fan), for lefthand connection to the heating system it is sufficient to rotate the heat exchanger by 180°.
When using fixing anchors, the bottom width of the trench heater is increased by 42 mm on each side.
During concreting, the trench heater must be levelled horizontally using the levelling set screws and fixed using fixing anchors, which prevents the trench heater from shifting during subsequent concrete pouring.
We recommend connecting to the heating system using a lockshield and a thermostatic valve. The connection to the heat exchanger is an inner thread G ½". After connection to the heating system, bleed the trench heater and carry out a pressure test.
We recommend thermally insulating the trench heater before installation on the outer longer sides of the casing (e.g. polystyrene) to prevent heat losses into the floor.
For trench heaters with a fan, we recommend fixing and sound insulation by pouring lean concrete along the sides and under the bottom of the casing.
During concrete pouring, the trench heater must be loaded vertically.
During concreting, it is very important to brace the trench heater to prevent longitudinal bending. For this purpose, spacers are installed in the trench heater. After concreting, these spacers can be easily removed.
During concrete or anhydrite pouring, thoroughly seal all openings into the trench heater to prevent it from being filled with building material. We also recommend insulating the trench heater casing against moisture.
If the trench heater will not be concreted in, we recommend using one of the raised floor installation variants. The standard version of the trench heater is not self-supporting.
KORAFLEX Variant F2V and F4V trench heaters with cooling and Pool versions (FKP, FVP) for humid environments are equipped as standard with a built-in condensate or overflow water drain. The F2V 11/20 variant and the Pool version have a drain tube positioned towards the wall. During installation of all the above-mentioned types, it is necessary to connect the tube at the bottom of the trench heater to piping with a secured slope for the drainage of overflow water or condensate. We recommend fitting the drain with an odour trap.
The fans are attached to the trench heater casing using magnets. In the stainless steel version, the fans are attached with hook-and-loop fasteners. This system allows the fans to be removed from the trench heater during installation to prevent damage or contamination. During normal operation, they can also be removed in the switched-off state and cleaned. In all model lines except the Pool line, the fans are installed so that the airflow is directed straight towards the window.
KORAFLEX Pool (FKP, FVP) trench heaters are designed for use near swimming pools. The separation partition serves to collect water from the pool, but cannot function as a standard pool overflow. This part is always positioned closer to the pool. The heating section with the heat exchanger and fans must always be positioned further from the pool. KORAFLEX Pool is equipped with two drain tubes. Installation, operation and maintenance of these units require special conditions, which can be found on our website or in the installation instructions. Not suitable for saltwater pools.
The electrical installation design must be carried out by a person with the appropriate professional qualifications and must comply with the relevant standards.
Installation and servicing of the electrical system must be performed by a qualified person with the appropriate electrotechnical qualifications.
Before commissioning, an initial inspection of the electrical installation must be carried out in accordance with the applicable standards.

TRENCH HEATER MULTIPLE INSTALLATIONS

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

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. This way, cool air at the window is screened and ambient air 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 INSTALLATION

_{Alterations to technical specifications reserved.}

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

ORDER CODE

Example of order code: FKP-100/11/26-V6P0P0

KORAFLEX trench heater with natural convection, Pool model, length 100 cm, depth 11cm, width 26 cm, counter-flow RAL 9006 grey lacquered heat exchanger, finished with hem, right-hand connection to heating system, without lowered face.

KORAFLEX	Convection	Pool		Length/Depth/Width (cm)		Heat exchanger type	Heat exchanger colour	Frame	Frame colour	Connection side	Lowered face
F	K	P	-	100/11/26	-	V	6	P	0	P	0
						V counter-flow 0 without heat exchanger	6 RAL 9006 lacquer 0 without heat exchanger	P hem	0 without frame	P right	0 without lowered face

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