RIELLO SC ACS 25
The SC ACS 25 is an instant domestic hot water mixer. It uses a brazed, stainless steel plate heat exchanger and is ideal
for use in combination with DHW storage cylinders.
Temperature of the hot water delivered to the taps is regulated by the thermostatic mixing of water in the primary circuit.
The primary circuit pump is controlled by a flow switch in the DHW circuit, connected in series to the pump. The product
is equipped with two filling/drain cocks. When the shut-off valves are closed, these can also be used to flush out the heat
exchanger.
A domestic hot water recirculation kit is available for further convenience.
The SC ACS 25 instant hot water mixer comes complete with an insulated frame.
CONTENTS OF THE KIT
Description
Qty.
1 DHW mixer in packing 2 Instruction manual 1
1
GENERAL SAFETY INFORMATION AND PRECAUTIONS
READ THIS MANUAL THOROUGHLY BEFORE PERFORMING ANY WORK ON THE PRODUCT.
The manufacturer reserves the right to modify the product without notice for the purpose of introducing technical improvements or to facilitate production, installation and positioning. The illustrations in this manual may therefore differ
slightly from the actual product. The safety of the product and the accuracy of the instructions provided are nevertheless
guaranteed.
This manual forms an integral part of the product itself and must be kept in a safe place in order to avoid damage and to
permit rapid consultation throughout the working life of the product.
Ideally, this manual should be kept with the product where it can be consulted whenever needed. The manual should
always accompany the product if sold or transferred to a new owner, or stay with it if the owner moves house and leaves
it behind, so that the next user can consult it.
1
cod. Doc-0072118 - Rev. 2 (09/2014)
ENGLISH
DESCRIPTION
GENERAL SAFETY INFORMATION
INSTALLATION
Disconnect the product from the mains power supply before performing any work on it.
The product must be installed in conformity to the laws and standards applicable in the country of installation.
The manufacturer’s responsibility is limited to the supply of the product. The product must be installed in conformity to
applicable standards by suitably qualified persons employed by a company that assumes full responsibility for the completed installation.
The manufacturer cannot be held responsible for consequences deriving from the unauthorised modification of the product or from the use of non-original spare parts.
bbDo not expose the product to the elements. It is not designed for use outdoors
ELECTRICAL CONNECTIONS
The product must be installed and all electrical connections made by suitably qualified personnel in conformity to applicable standards.
The product’s mains power cable must be connected to a fused, two-pole switch (power supply 230 VAC, 50 Hz). The
product must be correctly connected to ground.
bbThe product must be connected to the mains power supply via an earth leakage breaker in accordance with applicable standards. Correct functioning is only guaranteed provided the product is used with the pump for which it is
designed. The manufacturer cannot be held responsible for the consequences of improper uses.
WATER CONNECTIONS
On completion of all transport or handling operations, always check the tightness of the water fitting ring nuts.
Take particular care when connecting the product to the water supply. When tightening a fitting, always hold the opposite
fitting steady with a second tool to avoid twisting the copper pipes.
bbThe product must be installed, connected and tested by suitably qualified persons, in conformity to applicable
standards and in accordance with the instructions provided in the documentation supplied with it. N.B.: All pipes
must be insulated in conformity to applicable standards.
It is essential to respect the following precautions when using the product:
-- Do not touch hot parts of the product such as the water inlet and outlet pipes. Contact with hot parts can cause painful
burns.
-- Do not splash water or any other liquid over the product.
-- Do not rest any objects on top of the product.
-- Do not expose the product to steam from a cooking hob.
-- Do not allow children or inexperienced persons to operate the product.
-- Do not touch the product when barefoot or wet.
-- Do not pull on the electrical cables.
2
MAIN COMPONENTS
9
2
3
8
11
10
1
13
12
4
5
6
2
1 Pump
2 Ball valve, DN 20 1" M - 3/4” F
3 Red knob for primary circuit inlet valve
4 Blue knob for primary circuit return valve
5 Blue knob for cold water inlet valve
6 Black knob for non-return valve with DHW outlet temperature sensor
7 Non-return valve
8 Three-way mixer valve with thermostatic actuator, 35 - 65°C
9 Manual bleed valve, 3/8"
10 Brazed, stainless steel, plate heat exchanger with insulation
11 Flow switch
12 Filling/drain cock, 1/2”
13 Union for recirculation kit, 3/4” F
3
ENGLISH
7
WATER CIRCUIT
EAF
9
9
6
7 10 1
11
1
7
2
3
5
4
8
1
1
2
3
4
5
6
Shut-off valve
Three-way mixer valve
Modulating pump
Heat exchanger
Flow switch
Valve with temperature sensor
7 Non-return valve
8 Manual bleed valve
9 Manual drain valve
10 Recirculation pump (accessory kit)
11 Temperature sensor
TECHNICAL SPECIFICATIONS
DESCRIPTION
Thermal power absorbed with storage cylinder at 50°C and DHW water delivery
at 10-45°C
Water draw at 10-45°C with storage cylinder at 50°C
Thermal power absorbed with storage cylinder at 55°C and DHW water delivery
at 10-45°C
Water draw at 10-45°C with storage cylinder at 55°C
Thermal power absorbed with storage cylinder at 60°C and DHW water delivery
at 10-40°C
Water draw at 10-40°C with storage cylinder at 60°C
Maximum flow-rate primary
Minimum permissible temperature, DHW circuit
Maximum operating temperature
Maximum operating pressure, primary circuit
Opening pressure, primary circuit non-return valves
Opening pressure, DHW circuit non-return valves
Electrical power consumption
Power supply voltage
Power supply frequency
Index of protection
Net weight
Water capacity
4
SC ACS 25
37
kW
15
l/min
46
kW
19
l/min
54
kW
26
1200
2
90
10
28
28
45
230
50-60
54
16,1
5,2
l/min
l/h
°C
°C
bar
mbar
mbar
W
V
Hz
IP
kg
l
Domestic hot water production graph
30
42
10÷
°C
25
°C
48
10÷
50
10÷
20
°C
55
10÷
°C
15
ENGLISH
DHW flow rate
Produzione
ACS(l/min)
(l/min)
°C
45
10÷
10
5
40
45
50
55
60
Temperatura
prelievo
accumulo
(°C) (°C)
Temperature
of water
from storage
cylinder
65
70
NB: Correct functioning of the product is only guaranteed if the primary circuit inlet temperature is at least 5°C higher
than the DHW setpoint.
PUMP CURVES
H/m
p/kPa
Wilo-Yonos Para RS
15/6, 20/6, 25/6, 30/6
1-230 V - Rp1/2, Rp3/4, Rp1, Rp1 1/4
6
5
∆p
H/m
60
6
50
5
p/kPa
Wilo-Yonos Para RS
15/6, 20/6, 25/6, 30/6
1-230 V - Rp1/2, Rp3/4, Rp1, Rp1 1/4
50
∆p
-v
60
-v
40
4
30
3
2
20
2
20
1
10
1
10
0
0
4
3
0
m
ax
0
0,5
0
0
P1/W
1,0
0,2
2
1,5
2,0
0,4
4
2,5
3,0 Q/m³/h
0,6
6
0,8
8
ax
0
0,5
0
0
P1/W
1,0
0,2
2
1,5
2,0
0,4
4
2,5
0,8
8
20
20
0,5
1,0
1,5
2,0
2,5
Q/l/s
Q/Igpm
10
max
40
0
3,0 Q/m³/h
0,6
6
max
40
0
30
m
Q/l/s
Q/Igpm
10
40
0
3,0 Q/m³/h
5
0
0,5
1,0
1,5
2,0
2,5
3,0 Q/m³/h
0
OVERALL DIMENSIONS AND FITTING POSITIONS
400
65
MP - Primary inlet
RP - Primary outlet (return)
EAFS - Domestic cold water
inlet
UACS - DHW outlet
RS - Recirculation union
Depth (mm)
600
MP
RS
1” M
UACS EAFS
205
65
65
3/4” F
RP
65
WIRING DIAGRAM
230V
FLOW SWITCH
PUMP
6
SC ACS 25
1" M - 3/4" F
1" M - 3/4" F
1" M - 3/4" F
1" M - 3/4" F
3/4" F
250
SYSTEM SCHEMATIC
Example of wall mounted installation
DHW outlet
Recirculation
ENGLISH
Boiler
Primary
inlet
EAF
Primary outlet (return)
INSTALLATION
PRELIMINARY CHECKS
Carefully remove the packing and check that the product is complete and undamaged. If any defect or damage is detected, do not install or attempt to repair the product but return it to the retailer.
Dispose of packaging in compliance with applicable law.
bbMake sure that the installation position provides easy visibility of and access to the safety valves.
bbConnect the safety valves to a drain in conformity to applicable standards.
bbInstall the product as near as practical to the storage cylinder. The product is designed to work with a pipe length
of 4 metres (inlet and return) between itself and the storage cylinder.
bbDisconnect the product from the mains power supply before performing any work on it.
bbThe product must be installed in conformity to the laws and standards applicable in the country of installation.
bbThe manufacturer’s responsibility ends with the supply of the product. The product must be installed in conformity
to applicable standards by suitably qualified persons employed by a company that assumes full responsibility for
the completed installation.
INSTALLATION AND PUTTING INTO SERVICE
Bear in mind the following before installing the product:
-- The product is designed to mix domestic hot water from a storage cylinder. Any other use, or any use incompatible with
the product’s technical specifications, is considered improper. Do not connect the product directly to a boiler.
-- The product is not designed to be operated by children or persons with limited physical, psychological, sensorial or
mental capacities.
-- If the piping needed to connect the product to the water system is damaged, it must be replaced by a suitably qualified
person.
-- The installation must conform to all applicable laws and standards.
bbInstallation and connection of the product must be performed by an authorised, specialist company. The company
installing the product assumes all responsibility for ensuring that the installation and functioning of the product
conform to applicable standards.
7
bbThe product must be stored in a dry place where it is not subject to frost. The product must be installed where it is
protected against splashes of water. Ambient temperature in the place of installation must not exceed 40°C during
functioning of the product.
bbIt is recommended to install the product as near as practical to the storage cylinder in order to avoid unnecessary
heat loss from the connecting pipes.
WALL MOUNTING
bbHandle with care!
Remove the product from its packaging and remove the
polypropylene cover.
470
bbMake sure that the bracket (3) is perfectly vertical.
2
465
-- Unscrew the screws (2) and remove the mounting
bracket (3) from the rear of the product.
-- Fix the mounting bracket (3) to the wall with 12 mm wall
plugs (not supplied).
3
2
8
4
2
5
-- Tighten the screws (3) from the front of the product until
it is firmly secured to the bracket.
9
3
ENGLISH
-- Attach the product to the bracket (3) by inserting the
screws (2) through the slots (4) in the back panel, using
the side guides (5) to align it.
-- Slide the product down until the screws lie at the top of
the slots.
WATER CONNECTIONS
CONNECTION TO THE WATER CIRCUIT
1
3
2
4
5
2
6
K
7
1
2
3
4
5
6
Safety valve
Shut-off valve
Pressure gauge
Non-return valve
Pressure reducer valve (necessary for K>=6 bar)
Fine mesh filter
7 Expansion vessel (accessory)
K Fitting for domestic cold water supply
bbThe pipes between the product and the storage cylinder should be kept as short as possible.
bbConnect the product to the domestic cold water supply as shown.
bbInstall a filter in the domestic hot water circuit to capture impurities and protect the circuit. Also install a
non-return valve and an expansion vessel along the
domestic cold water supply.
UNIT OF
WATER PARAMETER MEASURE
If the water supply is harder than 25 to 30 °Fr, a suitable
treatment system should be installed upstream from the
water heating system to prevent corrosion and the formation of limescale.
PH
Saturation index (PH
delta)
Total hardness
Conductivity
Solid substances
Free chlorine
Hydrogen sulphide
Ammonia
Bicarbonate
Bicarbonate/Hydrogen
sulphide
Sulphur
Nitrate
Nitrite
Sulphate
Manganese
Dissolved iron
Free, aggressive carbon dioxide
Bear in mind that, because of the low thermal conductivity
of limescale, even deposits of only a couple of millimetres
in thickness can significantly reduce the efficiency of the
water heating system.
The ACS 20 hot water mixer is made from materials
that conform to the requirements of Ministerial Decree
174/2004 (Italy) implementing Council Directive 98/83/
EC.
All fittings are assembled in the factory. It is nevertheless
advisable to check their tightness after installing the product. It is also necessary to test the product for water tightness at operating pressure when putting it into service.
bbValues in excess of those specified in the table
alongside can damage the product and automatically invalidate the warranty. It is therefore important
to analyse the water to ensure that all values are
within the limits given in the table.
10
MAXIMUM
PERMISSIBLE
VALUE FOR
COPPERBRAZED HEAT
EXCHANGERS
7-9 (indicative of
saturation)
-0.2<0<+0.2
°Fr
μS/cm
mg/l
mg/l
mg/l
mg/l
mg/l
15-30
10…500
<30
<0.5
<0.05
<2
<300
mg/l
>1.0
mg/l
mg/l
mg/l
mg/l
mg/l
mg/l
<1
<100
<0.1
<100
<0.1
<0.2
mg/l
<20
ELECTRICAL CONNECTIONS
The following instructions are mandatory.
1 Use a multi-pole, magnetic thermal, earth leakage breaker and disconnector that conforms to legislation in the country of installation.
2 Respect the L (Phase) - N (Neutral) polarity. Keep the ground wire about 2 cm longer than the power wires.
3 Make sure the product is correctly connected to ground.
aaIt is strictly forbidden to use water pipes to ground the product.
aaDo not route the power cable near hot surfaces (like hot water pipes). Use a suitable class of cable if there is any
bbThe manufacturer declines all responsibility for damage caused by failing to ground the product adequately or by
failure to respect the wiring diagrams provided in this manual.
PUTTING INTO SERVICE
bbCAUTION! Completely fill the water circuit before
Pos.
1
2
3
4
5
6
7
putting the product into service.
-- Check that the ring nuts of all the water fittings are tight.
-- Fill the system and check it for water tightness.
-- Open the cold water and hot water shut-off valves slowly in order to avoid pressure surges.
-- Bleed the system as follows:
-- Open a hot water tap near the product and unscrew
the thermostat knob as far as it will go.
-- Open the bleed screw on the pump upstream to
bleed air from the storage cylinder side of the system. Continue until all the air has been bled from the
system.
-- Adjust the thermostat knob to the desired water temperature.
t (*C)
35
40
45
50
55
60
65
DEFAULT SETTING
ADJUSTMENT STOP
3
Default setting
1
2
bbAll fittings are assembled in the factory. It is never-
theless advisable to check their tightness after installing the product. It is also necessary to test the
product for water tightness at operating pressure
when putting it into service.
Adjustment stop
bbCheck the expansion vessel regularly in accord-
6
ance with applicable standards.
4
5
-- Set the pump to function at a constant pressure differential. This ensures a constant head within the permitted flow rate range.
-- Fit the insulation.
-- On completion of installation, check the product to ensure that it functions correctly and does not leak.
11
ENGLISH
possibility of contact with parts at temperatures above 50°C.
FLUSHING THE HEAT EXCHANGER
-- Shut off the DHW flow by closing the ball valves (1a)
and (1b) for the cold water inlet and hot water outlet
respectively.
-- Attach the flushing fluid supply to the cold water inlet
valve (2a).
-- Attach the flushing fluid drain to the DHW outlet valve
(2b). Pump flushing fluid through the heat exchanger
until it is clean.
2b
2a
1b
1a
CHECKS
On completion of the installation, perform the checks listed in the table below.
DESCRIPTION
OK
All automatic or manual filling pumps removed.
Safety valve calibrated to 6 bar, and flow open.
Drain pipe from safety valve routed suitably.
Expansion vessel correctly located and pre-charged to 2.5 bar.
12
RIELLO S.p.A.
37045 Legnago (VR)
Tel. 0442630111 - Fax 0442630371 - www.riello.it
As part of the company’s ongoing commitment to perfecting its range of products,
the appearance, dimensions, technical data, equipment and accessories
may be subject to variation.
Download PDF
Similar pages