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REMKO
FIN-TUBE HEAT EXCHANGER
RWT 18/RWT 31
Operation · Technology
Edition GB-B08
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Contents
Safety notes
Environmental protection and recycling
Warranty
Intended use
Description
Operation
Care and maintenance
Installation instructions for qualified personnel
Installation
Before commissioning
Commissioning
Technical data
Dimensions: flange seal and flange lid
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Made by REMKO
Read these operating instructions carefully
before commissioning / using the device!
These instructions are an integral part of the unit and must
always be kept in the vicinity of the installation location or
on the unit itself.
This operating manual is a translation of the German original.
Subject to modifications; no liability accepted for errors or
misprints!
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REMKO FIN-TUBE HEAT EXCHANGER
Safety notes
Carefully read the operating manual
before placing the unit in service for
the first time. It provides useful tips
and notes ! such as hazard warnings
to prevent injury and material damage.
Failure to follow the directions in this
manual can endanger persons, the
environment and the equipment itself
and will void any claims for liability.
■ Keep this manual in the vicinity of
the units.
■ Only qualified personnel may set up
and install the units and components.
■ Set-up, connection, and operation
of the units and their components
must be done in accordance with
the operating conditions as specified
in this manual and comply with all
applicable local regulations.
■ Modification of the units and
components supplied by REMKO
is not permitted and can cause
malfunctions.
■ Units and components may not be
operated in areas where there is an
increased risk of damage. Observe
the minimum clearances.
■ The operational safety of units and
components is only assured if they are
fully assembled and used as intended.
Safety devices may not be modified
or bypassed.
■ Do not operate units or components
if there are obvious defects or signs of
damage.
■ The units and components must
be kept at a safe distance from
flammable, explosive, combustible,
aggressive and dirty areas or
atmospheres.
■ Installation, repair and maintenance
work may only be carried out
by authorised specialists. Visual
inspections and cleaning can be
performed by the operator as long
the equipment is disconnected from
the power.
■ Take appropriate precautions when
performing installation, repair or
maintenance work or cleaning the
unit to make sure the unit does not
pose a danger to persons.
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Environmental protection and recycling
Disposing of packaging
All products are packed for transport in
environmentally friendly materials. You
can make a valuable contribution to
reducing waste and to sustaining raw
materials by only disposing of packaging
at approved collection points.
Disposal of
components
The manufacturing process for the units
is subject to continuous quality control.
Only high-grade materials are used, the
majority of which can be recycled. You
can also contribute to environmental
protection by only disposing of
components in accordance with local
regulations and in an environmentally
safe manner, e.g. through authorised
disposal and recycling specialists or at
collection points.
Intended
use
Fin-tube heat exchangers are designed
to provide hot water or process hot
water tanks with additional, indirect
heat.
Any different or additional use is a nonintended use.
The manufacturer/supplier assumes no
liability for damages arising from a nonintended use. The user bears the sole risk
in such cases.
Using the equipment as intended also
includes working in accordance with
the operating manual and installation
instructions and complying with the
maintenance requirements.
Warranty
The warranty conditions are listed in the
"General terms and conditions".
Please contact your direct contract
partner first.
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REMKO FIN-TUBE HEAT EXCHANGER
Description
Fin-tube heat exchangers are designed
especially to provide hot water or
process hot water tanks with additional,
indirect heat, e.g. with a solar thermal
system.
The following heating media can be
used:
hot water, district hot water and district
steam, heat carriers such as Antifrogen
L, Antifrogen N, PKL 100 and PKL 300.
New tanks, whether these are
galvanised or clad with plastic, can be
equipped and existing systems can of
course be retrofitted with the built-in
fin-tube heat exchanger.
The SF-CU fin-tubes are made from
seamless tubing, and all connecting
points are hard-soldered with silver
solder. Once soldered, the heating
coils are galvanised, wrapped helically
and equipped with complete insulating
screw connections then mounted on an
enamelled flange plate in such a way
that they are electrically insulated.
A coated steel sheet cap lined with
a flexible foam insert covers the flange.
This reduces the heat emission.
The compact design of the fin-tube heat
exchanger makes it possible to use highperformance heating coils in the lowest
part of the tank.
This provides for the optimum use
of the tank's entire volume for heat
absorption. This also provides for
layering of the water in the tank that
facilitates heat exchange. The heating
coils also show little pressure loss inside
the tube.
Operation
To operate the fin-tube heat exchange
economically and to conserve energy,
the water temperature in the tank
should be set as low as possible.
A circulation pump that circulates the
heating medium between the heating
appliance and the heat coil is generally
needed to heat the tank.
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Care and maintenance
Care
■
Only clean the units with a damp
cloth.
(adding, for instance, a liquid
household cleaner.)
Do not use harsh, scouring or
solvent-based cleaners .
Maintenance
■
We recommend concluding a
maintenance contract with a
specialist firm, which includes annual
maintenance services.
NOTE
This will ensure that your
equipment always operates reliably!
■
Regularly check the function of
the safety valve.
The expansion water amount at
maximum heat (approx. 80°C) represents
approx. 3.5% of the tank capacity.
When the safety valve test knob is lifted
or in the “Test” position, the water must
flow unhindered out of the safety valve
body into the drainage funnel.
Water should not drip from the safety
valve if the tank is not hot or if hot water
has been removed. If this does occur,
either the pressure in the water pipe is
greater than the permitted value or the
safety valve is defective. If the pressure in
the water pipe is higher than permitted,
a pressure relief valve must be used.
If the water is hard and when operating
the tank at more than 60°C, install a
standard descaling device upstream from
the tank or regularly clean the fin-tube
heat exchanger. The cleaning must be
done by a qualified specialist. To do so,
proceed as follows:
1. Remove the fin-tube heat exchanger.
2.. Carefully knock the limescale off or
clean the fin-tube heat exchanger
in a container filled with limescale
solvent.
3. Flush the fin-tube heat exchanger
thoroughly.
4. Replace the fin tube heat exchanger.
! ATTENTION
This can cause the cold water
supply and parts of the storage tank
connection fitting to become hot!
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REMKO FIN-TUBE HEAT EXCHANGER
Installation instructions
for qualified personnel
General installation notes
■
When in operation, the fin-tube heat
exchanger's heating coils must be
covered sufficiently with water on all
sides.
■
The thermally induced water flow
may not be obstructed.
■
As a rule, fin-tube heat exchangers
are installed horizontally in the tank.
■
Please take into account that
changes in the length of the
connecting lines caused by
temperature fluctuations must be
compensated for by expansion
elements or by suitable piping.
Installation of the fin-tube heat
exchanger
■
Check the contents of the packaging
for completeness and check the
unit for visible transport damage.
Immediately notify your contract
partner of any deficiencies.
For the proper installation of the the
heating cartridge, proceed as follows:
1. Unscrew and remove the insert
14, together with the complete
electrically insulated pipe fitting
(4, 15 to 18), from the connecting
fitting 6.
2. Remove the cover plate 3.
3. Carefully install the flange plate 19.
Do not bend the heat exchanger's
fins when inserting it in the tank!
4. Place the flange seal in the
supporting disc and seal this with the
flange using 8 M12 x 35 screws or 8
M12 nuts for a Ø 180 flange (RWT
18) or with 12 M12 x 35 screws or
12 M12 nuts for a Ø 240 flange
(RWT 31).
Tighten screws and nuts diagonally.
The max. torque is 35 Nm.
! ATTENTION
Make sure not to damage the
protective current bleeder resistor
1 on the brass strap 11 when
securing the screws or nuts!
5.
Insert the flexible foam disc 13 (heat
insulation) and the coated cover
plate. Both insulating plastic bushings
2 must be installed in the cover plate
3 to provide insulation)
.
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6.
Using the union nut 17, seal the insert
14 and insert the insulation clip 15.
7. Screw the insert 14 flat onto the
connecting fitting 6 until is rests against
the insulating plastic bushing 2.
8. Insert the insulating sleeves 4 into the
insert 14 and into the adapter nipple 18.
9. Establish the supply line to
the heating circuit and connect it to
the adapter nipple 18.
10. Screw the union nut 17 to the
adapter nipple 18; counter pressure
is provided by the the hex plate.
The max. torque is 15 Nm.
1 620 resistor
2 Insulating plastic
bushing
3 Cover plate
4 Insulating sleeve
5 Heat exchanger
6 Connecting fitting
7 Insulating sleeve
8 O-ring
9 Plastic angle
10 Swash plate
11 Brass strap
12 Hex nut
13 Flexible foam disc
14 Insert
15 Insulation clip
16 O-ring
17 Union nut
18 Adapter nipple
19 Flange plate
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REMKO FIN-TUBE HEAT EXCHANGER
Installation
General Information
■
Do not continually top up the water
level in the storage tank. This will
prevent corrosion damage to the tank.
■
In hard water areas, connect a
standard descaling device upstream
of the tank.
Electrically insulated installation
electrically insulated connecting fittings
To protect inadequately coated areas
against corrosion, magnesium anodes
or external current anodes are generally
installed in enamelled or in plastic clad
steel hot water tanks.
This protection against corrosion
provided by the use of cathodes
becomes problematic if heating coils
that are not insulated are also installed.
Heating coils that are not insulated
quickly consume the anodes. The
defective areas form a galvanic element
together with the valuable heating coil
materials that can cause the defective
area's substrate to decompose.
Insulating connecting fittings prevent
this galvanic element from forming and
in this way provide significant protection
against corrosion in coated steel hot
water tanks.
The insulated connections use insulate
the heating coils both against the tank
wall and against the metal connecting
lines and comply with DVGW data sheet
specifications.
W 511.
Protection against corrosion when using
different metals in the installation
The resistance of copper to corrosion
caused by contact with drinking water
is long proven. Copper has proven itself
as a working material especially given
the fact that chlorine is often present in
drinking water.
The heat transmitters also comply with
the requirements specified by DIN 1988
and DIN 4753.
When copper comes into contact with
water, copper ions are released to the
water.
Copper pipes do not pose a problem
because a dense, strongly adhering
top layer quickly forms.
In galvanised steel pipes installed downstream however, the released copper ions
can quickly cause corrosion.
To prevent corrosion when different
metals are used in the installation, the
outside of the heating coils is galvanically
tin-plated.
A protective current bleeder resistor is
installed to protect the fin-tube heat
exchanger against current-induced
corrosion.
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NOTE
Installation may only be performed
by authorised specialists.
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Before commissioning
Commissioning
The warm water tank must be filled with
water before it is put into service for
the first time.
While heating up, the expansion water
generated in the internal boiler should
drip out of the safety valve if there is
a pressure-tight connection and out
of the overflow mixer tap if there is a
connection that is not under pressure.
! ATTENTION
The warm water drain pipe as well
as parts of the safety equipment
may become hot.
NOTE
Commissioning should only be
performed and documented by
specially trained personnel.
During initial filling, the discharge valve
must be open. The warm water tank is
completely full when water, bubble free,
runs out of the valve's discharge pipe.
Once the water has been heated
successfully, the set temperature,
the actual temperature of the water
produced and that shown on any
temperature indicator should be
approximately the same.
Heating the water in the tank causes its
volume to increase.
While heating up, the expansion water
generated in the internal boiler should
drip out of the safety valve.
This dripping is necessary to the function
of the unit, and must not be prevented
by retightening the valves.
! ATTENTION
The warm water drain pipe as well
as parts of the safety equipment
may become hot.
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REMKO FIN-TUBE HEAT EXCHANGER
Technical data
Series RWT 18 RWT 31
Operating mode Additional, indirect heat
max. operating temperature °C 95
max. operating pressure bar 10
Heat exchanger surface m
Installation length mm 440 530
Connection Inches 3/4 AG 1 AG
Contents l 1.50 2.50
Flange
Immersion sleeve for the sensor no yes
EDP no. 260200 260210
We reserve the right to modify the dimensions and design as part of the ongoing technical development process.
2
Ø
1.40 3.10
180 / 8-hole 240 / 12-hole
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Type RWT 18 cycle outputs
VL/BW 560 l/h 680 l/h 780 l/h
°C
1)
kW
2)
l/h
3)
mbar4)kW
2)
l/h
3)
mbar4)kW
2)
l/h
3)
90/45 27.2 670 100 30.4 748 150 34.2 842 200
80/45 20.7 510 100 23.7 583 150 27.2 670 200
70/45 14.8 364 100 16.8 414 150 18.7 460 200
60/45 9.2 226 100 10.7 263 150 11.8 290 200
50/45 4.4 108 100 5.3 130 150 5.7 140 200
90/60 20.9 360 100 24.1 415 150 27.9 481 200
80/60 14.2 245 100 16.5 284 150 18.4 317 200
70/60 7.8 134 100 9.2 159 150 10.4 179 200
1) Supply temperature/domestic water temperature
2) Cycle output
3) Hot water output
4) Pressure loss
Type RWT 31 cycle outputs
VL/BW 860 l/h 1040 l/h 1200 l/h
°C
1)
kW
2)
l/h
3)
mbar4)kW
2)
l/h
3)
mbar4)kW
2)
l/h
3)
90/45 37 909 100 42.5 1044 150 47.5 1167 200
80/45 28 688 100 33 811 150 37 909 200
70/45 21 516 100 24 590 150 27 663 200
60/45 12.5 307 100 15 369 150 16.5 405 200
50/45 6 147 100 7 172 150 8 197 200
90/60 27 464 100 32 550 150 36.5 628 200
80/60 19 327 100 22.5 387 150 26 447 200
70/60 9.7 167 100 11.2 198 150 13.3 229 200
1) Supply temperature/domestic water temperature
2) Cycle output
3) Hot water output
4) Pressure loss
mbar
mbar
4)
4)
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REMKO FIN-TUBE HEAT EXCHANGER
Dimensions: flange seal and flange lid
RWT 18
D180 flange seal
RWT 31
ø 240
116
150
180
D180 flange lid
each 8 x Ø M12
116
150
180
D240 flange lid
ø 172
ø 235
We reserve the right to modify the dimensions and design as part of the ongoing technical development process.
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D240 flange seal
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REMKO INTERNATIONAL
... and also right in your neighbourhood!
Take advantage of our experience and advice
REMKO GmbH & Co. KG
Klima- und Wärmetechnik
Im Seelenkamp 12 D-32791 Lage
Postfach 1827 D-32777 Lage
Telephone +49 5232 6 06-0
Fax +49 5232 6 06-260
e-mail info@remko.de
Website www.remko.de
We reserve the right to make technical changes and provide no warranty as to the accuracy of this data!
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