REMKO EFS 50 User manual

Assembly and operating instructions
Read the instructions prior to performing any task!
REMKO fresh water station EFS 35/EFS 50
Instructions for users and specialists
0062-2017-09 Edition 2, en_GB

Installation and operating instructions (translation of the orig-
inal)
Read these operating instructions carefully before commis-
sioning / using this device!
These instructions are an integral part of the system and must
always be kept near or on the device.
Subject to modifications; No liability accepted for errors or mis-
prints!

Table of contents
1 Safety and usage instructions............................................................................................................. 4
1.1 General safety notes....................................................................................................................... 4
1.2 Identification of notes...................................................................................................................... 4
1.3 Personnel qualifications.................................................................................................................. 4
1.4 Dangers of failure to observe the safety notes................................................................................ 4
1.5 Safety-conscious working............................................................................................................... 4
1.6 Safety instructions for the operator................................................................................................. 5
1.7 Safety notes for installation and inspection tasks........................................................................... 5
1.8 Unauthorised modification and changes......................................................................................... 5
1.9 Intended use................................................................................................................................... 6
1.10 Safety-conscious working............................................................................................................. 6
1.11 Warranty........................................................................................................................................ 6
1.12 Transportation and packaging....................................................................................................... 6
1.13 Environmental protection and recycling........................................................................................ 6
2 Technical data........................................................................................................................................ 7
2.1 Unit data.......................................................................................................................................... 7
2.2 Pressure loss characteristic curves................................................................................................. 9
3 Unit description................................................................................................................................... 10
4Design and planning........................................................................................................................... 11
4.1 General notes................................................................................................................................ 11
4.2 Design of the storage tank............................................................................................................ 12
4.3 Influence of water quality on corrosion resistance........................................................................ 13
5 Circulation operation.......................................................................................................................... 15
6 Assembly and installation (specialist).............................................................................................. 15
6.1 Assembly and installation.............................................................................................................. 15
7 Commissioning (specialist)............................................................................................................... 18
7.1 General Information...................................................................................................................... 18
7.2 Filling the primary circuit............................................................................................................... 18
7.3 Commissioning the controller........................................................................................................ 19
7.4 Maximum dispensing medium flow rate........................................................................................ 20
7.5 Setting the Temperature................................................................................................................ 22
7.6 Commissioning report................................................................................................................... 25
8 Maintenance........................................................................................................................................ 25
9 Depiction of spare parts (specialist)................................................................................................. 26
10 Index..................................................................................................................................................... 28
3

1 Safety and
usage instructions
1.1 General safety notes
Carefully read the operating manual before com-
missioning the units for the first time. It contains
useful tips and notes such as hazard warnings to
prevent personal injury and material damage.
Failure to follow the directions in this manual not
only presents a danger to people, the environment
and the system itself, but will void any claims for
liability.
Keep this operating manual and the refrigerant
data sheet near to the units.
1.2 Identification of notes
This section provides an overview of all important
safety aspects for proper protection of people and
safe and fault-free operation.The instructions and
safety notes contained within this manual must be
observed in order to prevent accidents, personal
injury and material damage.
Notes attached directly to the units must be
observed in their entirety and be kept in a fully
legible condition.
Safety notes in this manual are indicated by sym-
bols. Safety notes are introduced with signal words
which help to highlight the magnitude of the danger
in question.
DANGER!
Contact with live parts poses an immediate
danger of death due to electric shock. Damage
to the insulation or individual components may
pose a danger of death.
DANGER!
This combination of symbol and signal word
warns of a situation in which there is immediate
danger, which if not avoided may be fatal or
cause serious injury.
WARNING!
This combination of symbol and signal word
warns of a potentially hazardous situation,
which if not avoided may be fatal or cause
serious injury.
CAUTION!
This combination of symbol and signal word
warns of a potentially hazardous situation,
which if not avoided may cause injury or mate-
rial and environmental damage.
NOTICE!
This combination of symbol and signal word
warns of a potentially hazardous situation,
which if not avoided may cause material and
environmental damage.
This symbol highlights useful tips and recom-
mendations as well as information for efficient
and fault-free operation.
1.3 Personnel qualifications
Personnel responsible for commissioning, opera-
tion, maintenance, inspection and installation must
be able to demonstrate that they hold a qualifica-
tion which proves their ability to undertake the
work.
1.4 Dangers of failure to observe
the safety notes
Failure to observe the safety notes may pose a risk
to people, the environment and the units. Failure to
observe the safety notes may void any claims for
damages.
In particular, failure to observe the safety notes
may pose the following risks:
nThe failure of important unit functions.
nThe failure of prescribed methods of mainte-
nance and repair.
nDanger to people on account of electrical and
mechanical effects.
1.5 Safety-conscious working
The safety notes contained in this manual, the
existing national regulations concerning accident
prevention as well as any internal company
working, operating and safety regulations must be
observed.
REMKO fresh water station
4

1.6 Safety instructions for the oper-
ator
The operational safety of the units and compo-
nents is only assured providing they are used as
intended and in a fully assembled state.
nThe units and components may only be set up,
installed and maintained by qualified per-
sonnel.
nThe existing regulations concerning accident
prevention must be adhered to.
nDo not operate units or components with
obvious defects or signs of damage.
nContact with equipment parts or components
can lead to burns or injury.
nEnsure that electrical energy does not pose a
risk.
nRegulations of the VDE and the local energy
supply company must be adhered to.
NOTICE!
Material damage due to mineral oils!
Mineral oil products permanently damage
EPDM seal elements; the sealing properties
may therefore be lost. We do not take responsi-
bility or provide warranty replacements for
damage caused by seals that are damaged in
this way.
–It is essential that you prevent EPDM from
coming into contact with mineral oil sub-
stances.
–Use a lubricant that is free of mineral oil and
has a silicone or polyalkylene basis, such
as Unisilkon L250L and Syntheso Glep 1
made by Klüber, or a silicon spray.
1.7 Safety notes for installation and
inspection tasks
nThe operator must ensure that all inspection
and installation work is carried out by author-
ised and qualified personnel who have thor-
oughly read the operating manual.
nWorks on the pump/system may only be car-
ried out whilst at a standstill as a matter of prin-
ciple.
nAppropriate hazard prevention measures must
be taken to prevent risks to people when per-
forming installation, repair, maintenance or
cleaning work on the units.
nThe setup, connection and operation of the
units and its components must be undertaken
in accordance with the usage and operating
conditions stipulated in this manual and comply
with all applicable regional regulations.
nRegional regulations and laws as well as the
Water Ecology Act must be observed.
nThe power supply should be adapted to the
requirements of the units.
nThe units and components must be kept at an
adequate distance from flammable, explosive,
combustible, abrasive and dirty areas or
atmospheres.
nSafety devices may not be modified or
bypassed.
NOTICE!
Malfunction!
The fresh water module must be integrated into
the equipotential bonding system of the elec-
trical installation. If this is not ensured by the
pipe network, set up an approved potential
equalisation connection to the main potential
connection.
1.8 Unauthorised modification and
changes
The operational safety of the fresh water module
that was delivered is guaranteed only with
intended use in accordance with section 1.8 of the
operating instructions. Under no circumstances
should the threshold values specified in the data-
sheet be exceeded.
Modifications or changes to units and components
are not permitted and may cause malfunctions.
Safety devices may not be modified or bypassed.
Original replacement parts and accessories
authorised by the manufacturer ensure safety. The
use of other parts may invalidate liability for
resulting consequences.
5

1.9 Intended use
The fresh water module is only permitted to be
installed in heating systems between the buffer
tank and the domestic water circuit. Depending on
the design, it may only be installed and operated
vertically!
Use only REMKO accessories in conjunction with
the fresh water module.
Any different or additional use is a non-intended
use. The manufacturer/supplier assumes no lia-
bility for damages arising from a non-intended use.
The user bears the sole risk in such cases.
Intended use also includes working in accordance
with the operating and installation instructions and
complying with the maintenance requirements.
The threshold values specified in the technical
data must not be exceeded.
1.10 Safety-conscious working
The safety notes contained in this manual, the
existing national regulations concerning accident
prevention as well as any internal company
working, operating and safety regulations must be
observed.
1.11 Warranty
For warranty claims to be considered, it is essential
that the ordering party or its representative com-
plete and return the "certificate of warranty" to
REMKO GmbH & Co. KG at the time when the
units are purchased and commissioned.
The warranty conditions are detailed in the "Gen-
eral business and delivery conditions". Further-
more, only the parties to a contract can conclude
special agreements beyond these conditions. In
this case, contact your contractual partner in the
first instance.
1.12 Transportation and
packaging
The units are shipped in sturdy transport pack-
aging or within the heat pump housing. Immedi-
ately check the units on delivery and make a note
of any damage or missing parts on the delivery
note. Inform the forwarding agent and contractual
partner. Claims under guarantee made at a later
date will not be accepted.
WARNING!
Plastic films and bags etc. are dangerous
toys for children!
Why:
- Leave packaging material are not around.
- Packaging material may not be accessible to
children!
1.13 Environmental protection and
recycling
Disposing of packaging
All products are packed for transport in environ-
mentally friendly materials. Make a valuable contri-
bution to reducing waste and sustaining raw mate-
rials. Only dispose of packaging at approved
collection points.
Disposing of the units and their components
For the manufacture of the units and components,
only recyclable materials have been used. Help
protect the environment by ensuring that the units
or components (for example batteries) are not dis-
posed of in household waste, but only in accord-
ance with local regulations and in an environmen-
tally safe manner, e.g. using authorised disposal
and recycling specialists or council collection
points.
REMKO fresh water station
6

2 Technical data
2.1 Unit data
Series EFS 35 EFS 50
Operating data
Maximum permitted pressure, primary bar 3
Maximum permitted pressure, secon-
dary
bar 10
Operating temperature °C 2-95
Pipe connections
Primary circuit (tank circuit) Inches 1 1/2" OT 2" OT
Secondary circuit (domestic water cir-
cuit) Inches 1" OT 1 1/4" OT
Equipment
Gravity brake mmWS 2 x 200 2 x 400
Primary pump HE pump with PWM control
W 4-70 6-140
Circulation pump (optional) HE pump with PWM control, 5-63 watts
Heat exchanger 40 Plates 60 Plates
Medium flow rate probe
(for technical data, see extra table) FlowSonic, measurement range: 1-133 l/min
Temperature sensor Pt 1000, fast
Materials
Valves Brass
Seals: O-rings Klingersil/EPDM
Flat seals AFM 34, asbestos-free
Plate heat exchanger Stainless steel 1.4400/solder: 99.99% Cu
Insulation EPP
Gravity brake Brass
Dimensions
Height (with insulation) mm 795
Width (with insulation) mm 602
Depth (with insulation) mm 298
Top axis-centre distance mm 120
Bottom axis-centre distance mm 100
7

Flow meter technical data
Series FlowSonic
Dimensions
Height mm 125
Top connection Inches 1" IT (DN20)
Bottom connection Inches 1" IT (DN20)
Hydraulics
Measuring range l/min 1-100
Maximum permissible temperature °C 100 (medium)
Maximum permissible pressure bar 16 (max. pressure surges 25 bar)
Usable medium Water (potable)
Cvs value 8
Flow measurement
Accuracy ± 10% (of measured value)
Reaction time sec. < 1
Equipment
Medium flow rate probe Ultrasonic sensors
Electrical specifications
Supply voltage V 5 V DC
Output signal
Uout = 0,03153 * V [l/min] + 0,35 V
V
l
min
( )
Power consumption mW < 100
Protection class IP 44
Wire colours
White Medium flow rate (V)
Green GND
Brown Supply voltage (+ 5 V)
Environment
Ambient temperature °C 0-70
Air humidity % rel. 0-95 (relative), non-condensing
REMKO fresh water station
8

2.2 Pressure loss characteristic curves
A
B
C
Grundfos UPM2 15-75 CIL
Grundfos UPM2 25-75
1
2
EFS 35
Fig. 1: Pressure loss characteristic curve EFS 35
A: Pressure [mWS]
B: Medium flow rate [m3/h]
C: Pressure [kPa]
1: Secondary/2: Primary
A
B
C
EFS 50
1
2
Fig. 2: Pressure loss characteristic curve EFS 50
A: Pressure [mWS]
B: Medium flow rate [m3/h]
C: Pressure [kPa]
1: Secondary
2: Primary
9

3 Unit description
The fresh water station is a pre-installed valve
group that was checked for leak tightness; it is
used to transfer heat between the buffer tank and
the domestic water circuit. It contains a pre-set
controller and important valves for operating the
system:
nBall valves in the primary circuit
nPiston valves in the secondary circuit
nSafety valve in the secondary circuit
nPre-installed controller
nTemperature probe on the cold water supply
nTemperature probe on the heating supply
nUltrasonic flow rate meter on the domestic hot
water outlet
nPrimary pump that can be shut off
nBall valve for filling/drainage, for bleeding the
heat exchanger and the pump
NOTICE!
A check for pressure and leak tightness after
successful installation must always be per-
formed before commissioning
REMKO GmbH & Co. KG herewith confirms
that the supplied product corresponds to the
UBA (German Environment Agency)
positive list.
A
B
C
E
1
2
3
4
76
8
9
10
11
5
D
12
13
14
Fig. 3: Product description
A: Primary side: Return to the buffer tank
B: Secondary side: Hot water circulation, return
C: Secondary side: Cold water inlet
D: Secondary side: Hot water outlet
E: Primary side: Inlet from the buffer tank
1: Ball valve with gravity brake
2: Primary pump
3: Check valve with drain valve
4: Circulation pump
5: Piston valve (green) with drain valve
6: Piston valve (blue) with drain valve
7: Piston valve (red) with temperature probe
8: Ultrasonic flow rate meter FlowSonic
9: Ball valve for filling/drainage and temperature
probe
10: Plate heat exchanger
11: Circulations pipe
12: Temperature probe (primary cycle)
13: Safety valve and temperature probe
14: Ball valve with gravity brake
REMKO fresh water station
10

4 Design and planning
4.1 General notes
The fresh water station is a fresh water module
that heats domestic water according to the contin-
uous flow heater principle. In order to ensure fault-
free operation of the fresh water station, the
system must fulfil certain prerequisites. Before
installation, take some time for planning.
CAUTION!
Danger of scalding due to hot water!
Due to external circulation in the primary circuit,
water with a temperature of up to 90 °C can
leak out at the dispensing connection.
–No external pumps are permitted to be
installed between the fresh water module
and the buffer tank.
–The fresh water module is not permitted to
be connected to a heating cycle distributor.
Installation example
The operating mode can be bivalent alternative.
This hydraulic diagram serves merely to assist in planning activities;
the hydraulic system on site must be planned and laid out by the installer!
Subject to technical changes!
MPS 800
oder/or
MPS 1000
A
B
C
FB
KW WW
D
E
Fig. 4: Fresh water station with optional circulation set and optional return distribution
(diagram with missing hydraulic components!)
A: Outdoor unit
B: Indoor unit
C: Storage tank
D: Circulation
E: Fresh water station
FB: Floor heating cycle
KW: Cold water
WW: Hot water
11

4.2 Design of the storage tank
You can use the following table to calculate the approximate required volume of the buffer tank.
Temperature in buffer tank [°C] HW temperature [°C] set on
controller
Reqd. Storage tank volume per
litre of HW [Litre]
50 45 1.3
60
45 0.8
50 1.0
55 1.4
70
45 0.7
50 0.8
55 0.9
80
45 0.5
50 0.6
55 0.7
Sample calculation for the design of the buffer tank:
Temperature of buffer tank: 50 °C, required dispensing medium flow rate at water valve: 20 l/min
DHW temperature set on the controller: 45 °C
How large must the Storage tank be if a 20-minute dispensing operation is to take place without reheating?
20 l/min x 20 min = 400 l
400 l x 1.3 = 520 l ð The heated part of the buffer tank must be 520 litres in size.
The required buffer volume for 1 litre of water
is calculated using the following formula:
VP
VW
PV =
Bv: Required buffer volume
Vb: Volume of buffer
Vh: Volume of hot water
If there is a large temperature spread between the
buffer and the drinking water (e.g. 90-45): 0.5
If there is a medium temperature spread between
the buffer and the drinking water (e.g. 70-45): 0.7
If there is a low temperature spread between the
buffer and the drinking water (e.g. 55-45): 1.0
The hot water volume depends on the position
of the installed S 08 probe (Smart Control hot
water probe). The higher this is installed on the
buffer tank, the lower the hot water volume.
REMKO fresh water station
12

4.3 Influence of water quality on corrosion resistance
This chapter is intended to provide an overview of the corrosion resistance of stainless steels and soldering
materials in tap water at room temperature. The table lists several important chemical components, but the
actual corrosion is a very complex process that is influenced by many different components in combination
with each other. This table is therefore a considerable simplification.
Explanations:
"+" = Good resistance under normal conditions
"0" = Corrosion can occur, especially if other factors are rated as 0
"-" = Use not recommended
Plate material Soldering mate-
rial
Water content
Concentra-
tion (mg/l or
ppm)
Time limits
for analysis
AISI
304
AISI
316
254
SMO
Cop
per
Nick
el
Stai
nles
s
Alkalinity (HCO3) < 70 Within 24 hrs. + + + 0 + +
70-300 + + + + + +
> 300 + + + 0/+ + +
Sulphate 1) (SO42-)< 70 No limit + + + + + +
70-300 + + + 0/- + +
> 300 + + + + + +
HCO3- / SO42- > 1.0 No limit + + + + + +
< 1.0 + + + 0/- + +
Electrical conductivity < 10 µS/cm No limit + + + 0 + +
10-500 µS/cm + + + + + +
> 500 µS/cm + + + 0 + +
pH 2) < 6.0 Within 24 hrs. 0 0 0 0 0 +
6.0-7.5 + + + 0 + +
7.5-9.0 + + + + + +
> 9.0 + + + 0 + +
Ammonium (NH4+)< 2 Within 24 hrs. + + + + + +
2-20 + + + 0 + +
> 20 + + + - + +
Chloride (Cl-)
See also table "Chloride content"
Ä on page 14
< 100 No limit + + + + + +
100-200 0 + + + + +
200-300 - + + + + +
> 300 - - + 0/+ + +
Free chlorine (Cl2) < 1 Within 5 hrs + + + + + +
1-5 - - 0 0 + +
> 5 - - - 0/- + +
13

Plate material Soldering mate-
rial
Water content
Concentra-
tion (mg/l or
ppm)
Time limits
for analysis
AISI
304
AISI
316
254
SMO
Cop
per
Nick
el
Stai
nles
s
Hydrogen sulphide (H2S) < 0.05 No limit + + + + +
> 0.05 + + 0/- + +
Free (aggressive)
Carbon dioxide (CO2)
< 5 No limit + + + + + +
5-20 + + + 0 + +
> 20 + + + - + +
Overall hardness (°dH) 4.0-8.5 No limit + + + + + +
Nitrate 1) (NO3-)< 100 No limit + + + + + +
> 100 + + + 0 + +
Iron 3) (Fe) < 0.2 No limit + + + + + +
> 0.2 + + + 0 + +
Aluminium (Al) < 0.2 No limit + + + + + +
> 0.2 + + + 0 + +
Manganese 3) (Mn) < 0.1 No limit + + + + + +
> 0.1 + + + 0 + +
1) Sulphates and nitrates act as inhibitors for pitting corrosion caused by chlorides in pH-neutral environ-
ments
2) Generally, a low pH (below 6) increases the risk of corrosion and a high pH (over 7.5) reduces the risk of
corrosion
3) Fe3+ and Mn4+ are strong oxidisers and can increase the risk of local corrosion in stainless steels
SiO2 over 150 ppm increases the risk of calcification
Chloride content
Highest temperature
60 °C 80 °C 120 °C 130 °C
= 10 ppm SS 304 SS 304 SS 304 SS 316
= 25 ppm SS 304 SS 304 SS 316 SS 316
= 50 ppm SS 304 SS 316 SS 316 Ti / 254 SMO
= 80 ppm SS 316 SS 316 SS 316 Ti / 254 SMO
= 150 ppm SS 316 SS 316 Ti / 254 SMO Ti / 254 SMO
= 300 ppm SS 316 Ti / 254 SMO Ti / 254 SMO Ti / 254 SMO
> 300 ppm Ti / 254 SMO Ti / 254 SMO Ti / 254 SMO Ti / 254 SMO
REMKO fresh water station
14

5 Circulation operation
The fresh water station is (optionally) equipped
with a circulation pump. Three possible operating
modes are stored in the controller to operate the
circulation pump (also see the operating instruc-
tions of the controller).
nPulse-controlled operation (as necessary /
requirement):
Actuating a hot water dispensing connection
for a short time (dispensing impulse: ~2 sec-
onds) starts the circulation pump. The circula-
tion pump then runs for a few minutes (adjust-
able).
nTime-dependent operation:
Operation of the circulation pump can be
adjusted on a weekly timer within a freely-
selectable period. In this operating mode, cir-
culation begins at the start of the period that is
set. Circulation is deactivated after the set
period expires.
nTemperature-dependent operation:
In this operating mode, circulation is only
started if the temperature falls below the min-
imum temperature that can be set on the circu-
lation temperature probe within the operation
period. Circulation is deactivated after the
adjustable target temperature is reached or
after the set period expires.
Any of the operating modes can be combined, e.g.
time-dependent and temperature-dependent oper-
ation. In this case, circulation is only active if the
temperature falls below the temperature on the cir-
culation temperature probe and the time window is
active. Outside this time window, the circulation
pump can be activated via a dispensing pulse if
pulse-controlled operation is also activated.
NOTICE!
In the delivered state, circulation is not acti-
vated (see the operating instructions of the con-
troller). If the REMKO circulation pump is
installed, the operating mode must be activated
urgently. The speed of the circulation pump
must be specified via the PWM signal. ( Factory
setting: 0 % ).
6 Assembly and installa-
tion (specialist)
6.1 Assembly and installation
DANGER!
Danger due to electric shock!
–Remove the power plug before carrying out
electrical work on the controller!
–Plug the power plug of the controller back in
to a socket only after completing all installa-
tion works. In this way, you can prevent the
motors from starting up accidentally.
NOTICE!
To avoid damage to the system, the installation
location must be dry, capable of carrying the
load and frost-free.
If the fresh water station is not installed directly on
the storage tank, note the following points:
1. Determine the installation location of the
fresh water module near to the buffer tank.
On the heating side, the pipes must not
exceed a length of 4 m for DN 32.
2. During installation, you can use a drilling
template as an assembly aid. One can be
found on the station.
3. Transfer the dimensions for the holes to the
wall.
4. Drill the holes and insert the enclosed wall
plugs.
5. Turn the screws into the wall plugs until
around 40 mm is sticking out of the wall.
6. Remove the station from the packaging.
7. Remove the front insulation jacket.
15

Fig. 5: Distance between the holes
8. Hang the fresh water module onto the
screws. Tighten the screws so that the insu-
lation on the sides is flush to the wall.
9. Connect the pipes of the fresh water module
EFS 35 to the system in accordance with
Fig. 6, or the fresh water module EFS 50 in
accordance with Fig. 7.
Piping of the fresh water station EFS 35
1. Primary side:
Return flow to the buffer tank,
1 1/2” connection, OT,
Piping at least DN 25, 28 x 1.5 mm,
maximum length 2 m
2. Secondary side:
Hot water circulation, return flow,
1” connection, OT, flat-sealing
3. Secondary side:
Cold water inlet,
1” connection, OT, flat-sealing
4. Secondary side:
Hot water outlet,
1” connection, OT, flat-sealing
5. Primary side:
Inlet from the buffer tank,
1 1/2” connection, OT,
Piping at least DN 25, 28 x 1.5 mm,
maximum length 2 m
A
B
1
2
3
5
4
Fig. 6: Piping of the fresh water station
A: Pipe distance from the wall (primary) = 95 mm
B: Pipe distance from the wall
(secondary) = 167 mm
Piping of the fresh water station EFS 50
1. Primary side:
Return flow to the buffer tank,
2” connection, OT,
Piping at least DN 32, 35 x 1.5 mm,
maximum length 2 m
REMKO fresh water station
16

2. Secondary side:
Hot water circulation, return flow,
1” connection, OT, flat-sealing
3. Secondary side:
Cold water inlet,
1 1/4” connection, OT, flat-sealing
4. Secondary side:
Hot water outlet,
1 1/4” connection, OT, flat-sealing
5. Primary side:
Inlet from the buffer tank,
2” connection, OT,
Piping at least DN 32, 35 x 1.5 mm,
maximum length 2 m
A
B
1
2
3
5
4
Fig. 7: Piping of the fresh water station
A: Pipe distance from the wall (primary) = 95 mm
B: Pipe distance from the wall
(secondary) = 167 mm
Integration in a domestic connection group
(safety assembly)
Please note!
A domestic connection group (safety assembly)
is required despite an integrated safety valve
(DIN 1988)!
Installation example
A
Fig. 8: Installation example
A: Fresh water station
1: Shut-off valve
2: Pressure reducer
3: Test device
4: Backflow preventer
5: Connection point for measuring device
6: Shut-off valve
7: Safety valve with drainage line and funnel trap
8: Through-flow membrane expansion vessel
(recommended if pressure fluctuations are
anticipated on the domestic connection side)
A
Fig. 9: Integration in a domestic connection group
A: Domestic connection group (safety assembly)
17

7 Commissioning (specialist)
7.1 General Information
NOTE:
Open the valves in the pipes and the fresh water
station slowly, in order to prevent pressure
shocks.
Function of the gravity brake
The primary circuit is equipped with a gravity brake
in the ball valve, in order to prevent undesired
gravity circulation.
The gravity brake must be opened to bleed and
clean the system. To do this, turn the ball valve to
the 45° position. The gravity brake is out of opera-
tion.
All ball valves and valves must be opened com-
pletely (0°) in order to operate the system.
B
A
C
0°
45°
90°
14
Fig. 10: Setting the gravity brake
A: 0° position - Gravity brake in Operation, only
flowing in flow direction.
B: 45° position - Gravity brake out of Operation,
flowing in both directions.
C: 90° position - Ball valve closed, no flow.
7.2 Filling the primary circuit
If the storage tank is (partially) filled
CAUTION!
Danger of scalding due to hot water!
The system is under pressure. By opening the
ball valve for filling/drainage, water of up to
90 °C can leak out of the ball valve for filling/
drainage, which may cause bodily injury.
–Open the ball valve for filling/drainage
slowly and from a safe distance.
1. Open the ball valve (F) by turning it to the 0°
position.
2. Fill the storage tank using the filling valves
provided by the customer until you reach an
operating pressure of 1.5 bar*. Use the
heating water in accordance with VDI 2035 /
ÖNorm H5195-1.
3. Connect a hose to the ball valve for filling/
drainage (B). Carefully actuate the ball valve
for filling/drainage (B) and allow the air to
bleed out.
4. Connect the ball valve for filling/drainage (B).
5. Close the ball valve (F) by turning it to the
90° position.
6. Open the ball valve (G) slowly by turning it to
the 45° position.
7. Carefully actuate the ball valve for filling/
drainage (B) and allow the air to bleed out.
8. Connect the ball valve for filling/drainage (B).
9. After bleeding, check the operating pressure
of the storage tank and increase it if neces-
sary.
10. Open the ball valves (F) and (G) completely
by turning them to the 0° position.
1.5 bar in the primary circuit = recommended
minimum value.
The system pressures that depend on the design
and the components of the heating system are
also crucial for the pressure
REMKO fresh water station
18

7.3 Commissioning the controller
DANGER!
Danger due to electric shock!
Check whether the probes and pumps to the
controller are connected and whether the con-
troller housing is closed. Only then should you
insert the power plug into the socket.
1. Remove the controller's front panel (see the
controller instructions).
2. In the selection menu of the controller, select
manual operation ("H1"). Switch the PWM
signal of the pump on ("100 %").
3. Allow the pump to run for a few minutes in
order to bleed the fresh water station.
4. If you are still hearing air noises after this
point, carefully actuate the bleeder (M), while
the pump is still running, and allow the air to
escape.
5. If you no longer hear any air noises, switch
the pump off. To do this, select manual oper-
ation ("H1") in the selection menu of the con-
troller.
6. Set the pump to automatic operation ("A").
7. Slowly open the piston valves on the secon-
dary side ("G" and "H").
8. Öffnen Sie eine Trinkwarmwasser-Zapfstelle
(z. B. Wasserhahn) mit einem Durchfluss von
mindestens 10 l/min und lassen Sie das
Wasser ca. 2 Minuten lang laufen, um den
Sekundärkreis zu entlüften. Schließen Sie
danach alle Zapfstellen im Sekundärkreis.
9. Use the pre-assembled power supply cable
to connect the fresh water station to the
mains (230 V, 50 Hz).
10. Ensure that the fresh water station is cor-
rectly included in the equipotential bonding of
the system.
11. Set the required domestic hot water tempera-
ture on the controller (see the following
page).
12. The fresh water station is now ready for oper-
ation.
MO A
Fig. 11: Primary circuit
H G
Fig. 12: Secondary circuit
19

7.4 Maximum dispensing medium flow rate
The following diagram shows the maximum dispensing medium flow rate depending on the storage tank
temperature; this assumes a pre-set hot water temperature of 45 °C at the dispensing connection. The inte-
grated controller prevents the temperature from decreasing as long as the maximum medium flow rate is not
exceeded.
B
0
10
20
30
40
50
60
A
0
20
40
60
80
100
120
140
70 °C
90 °C 80 °C
65 °C
80
90
100
70
160
180
200
220
240
1
2
50 °C
Friwa EFS 35
Friwa EFS 50
Fig. 13: Maximum dispensing medium flow rate
A: Dispensing medium flow rate [l/min]
B: Power [kW]
1: Hot water temperature: 45 °C
2: Buffer storage temperature
Boundary conditions:
Cold water temperature: 10 °C,
Maximum pressure loss on the domestic water
side of the fresh water station: 1000 mbar
The following examples explain the relationships
between the individual variables of the hot water
temperature, the dispensing medium flow rate and
the buffer tank temperature, and show how these
affect the transmission capacity of the fresh water
station.
The hot water temperature that is set in the
Smart Control controller (S 08 probe) is the ref-
erence temperature for the buffer tank. Factory
setting: 45 °C.
Example 1
Hot water temperature at the dispensing connec-
tion: 45 °C
Temperature in the buffer tank: 60 °C
EFS 35
ð Maximum dispensing medium flow rate: 50 l/
min, transmission capacity: 121 kW
EFS 50
ð Maximum dispensing medium flow rate: 77 l/
min, transmission capacity: 187 kW
Example 2
Hot water temperature at the dispensing connec-
tion: 45 °C
Maximum dispensing medium flow rate: 60 l/min
EFS 35
REMKO fresh water station
20