Riello SC ACS 40 User manual

1
ENGLISH
SC ACS 40
SC ACS 40 is an instantaneous domestic hot water production module that uses the working principle of a stainless steel
plates exchanger.
The setting of the domestic hot water outlet temperature (secondary side) happens with the modulation of the primary
circuit flow rate through a variable flow pump controlled by MFWC controller (PWM control).
Description Qty.
1 DHW mixer in packing 1
2 Instruction manual 1
3 Circulation pump assembling instructions 1
4 Immersion sensors 1
5 Fuse 1
DESCRIPTION
CONTENTS OF KIT
At the end of its life, the product
should be not be disposed of
as solid urban waste, but rather
it should be handed over to a
differentiated waste collection
centre.
cod. Doc-0100459 - Rev. 1 (06/2021)

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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 im-
provements 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.
GENERAL SAFETY INFORMATION
INSTALLATION
Disconnect the product from the mains power supply before commencing 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 ends with the supply of the product. The product must be installed using best pro-
fessional practices, 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 prod-
uct or from the use of non-original spare parts.
b Do 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 appli-
cable 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.
b The product must be connected to the mains power supply via an earth leakage breaker in accordance with appli-
cable 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.
b The 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.
- Wear protective gloves and safety shoes before handling the product.

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ENGLISH
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37 2 3
11
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6
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MAIN COMPONENTS
1 Galvanised insulated backplate
2 Ball check valve, DN 20 3/4” F – 1” M
3 Ball valves, DN 20 3/4” F - 1" M
4 Pump (primary circuit)
5 Non-return valve (recirculation circuit)
6 Safety valve, 10 bar (secondary circuit)
7 Filling/drain cock, 1/2”
8 Flow meter and temperature sensor (secondary circuit)
9 Brazed, stainless steel, plate heat exchanger
10 Electronic control unit
11 Piping

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WATER CIRCUIT
TECHNICAL SPECIFICATIONS
5
3
3
6
77
8
4
12
7
7
EAF
1 Primary circuit high efficiency pump
2 Plate heat exchanger
3 Load / drain tap
4 Manual air vent
5 Recirculation kit
6 Vortex flow sensor
7 DN20 ball valve
8 Safety valve
DESCRIPTION SC ACS 40
Thermal power supplied with storage cylinder at 50°C and DHW water delivery at 10-45°C 72 kW
Water draw at 10-45°C with storage cylinder at 50°C 29,5 l/min
Thermal power absorbed with storage cylinder at 55°C and DHW water delivery at 10-45°C 90 kW
Water draw at 10-45°C with storage cylinder at 55°C 37 l/min
Thermal power absorbed with storage cylinder at 60°C and DHW water delivery at 10-48°C 116,7 kW
Water draw at 10-48°C with storage cylinder at 60°C 44 l/min
Maximum flow-rate primary 1850 l/h
Minimum permissible temperature, DHW circuit 5 °C
Maximum operating temperature 90 °C
Maximum operating pressure, primary circuit 10 bar
Opening pressure, primary circuit non-return valves 28 mbar
Opening pressure, DHW circuit non-return valves 28 mbar
Absorbed electric power 48 W
Power supply voltage 230 V
Power supply frequency 50-60 Hz
Control unit protection category 40 IP
Net weight 19,2 kg
Water capacity 6,6 l

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ENGLISH
Domestic hot water production graph
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.
10÷42 °C
10÷45 °C
10÷48 °C
10÷50 °C
10÷55 °C
Produzione ACS (l/min)
Mandata primario (°C)
40
0
5
10
15
20
25
30
35
40
45
45 50 55 60 65
70
Primary inlet (°C)
DHW ow rate (l/min)