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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.
Description
1 DHW mixer in packing
2 Instruction manual
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
centre.
SC ACS 25
DESCRIPTION
CONTENTS OF THE KIT
Qty.
1
1
waste
collection
1
cod. Doc-0100455 - Rev. 1 (06/2021)
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Summary of Contents for Riello SC ACS 25
- Page 1 SC ACS 25 DESCRIPTION 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.
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Page 2: General Safety Information And Precautions
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. -
Page 3: Main Components
MAIN COMPONENTS 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"... -
Page 4: Water Circuit
5 Flow switch 11 Temperature sensor 6 Valve with temperature sensor TECHNICAL SPECIFICATIONS DESCRIPTION SC ACS 25 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 l/min Thermal power absorbed with storage cylinder at 55°C and DHW water delivery... - Page 5 Domestic hot water production graph Temperatura prelievo accumulo (°C) Temperature of water from storage cylinder (°C) 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. PRESSURE DROP OF THE DHW SECONDARY CIRCUIT...
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Page 6: Pump Curves
PUMP CURVES p/kPa p/kPa Wilo Para RS Wilo Para RS 15/6, 20/6, 25/6, 30/6 15/6, 20/6, 25/6, 30/6 1-230 V - Rp1/2, Rp3/4, Rp1, Rp1 1/4 1-230 V - Rp1/2, Rp3/4, Rp1, Rp1 1/4 Q/m³/h Q/m³/h Q/l/s Q/l/s Q/Igpm Q/Igpm DHW RECIRCULATION PERFORMANCE CURVES P (m H 1,00... -
Page 7: Wiring Diagram
OVERALL DIMENSIONS AND FITTING POSITIONS SC ACS 25 MP - Primary inlet 1" M - 3/4" F RP - Primary outlet (return) 1" M - 3/4" F EAFS - Domestic cold water 1" M - 3/4" F inlet UACS - DHW outlet 1"... -
Page 8: System Schematic
SYSTEM SCHEMATIC Example of wall mounted installation DHW outlet Recirculation Primary inlet 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 de- tected, do not install or attempt to repair the product but return it to the retailer. Dispose of packaging in compliance with applicable law. - Page 9 The 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.
- Page 10 - 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.
- Page 11 WATER CONNECTIONS CONNECTION TO THE WATER CIRCUIT 1 Safety valve 7 Expansion vessel (accessory) 2 Shut-off valve K Fitting for domestic cold water supply 3 Pressure gauge 4 Non-return valve 5 Pressure reducer valve (necessary for K>=6 bar) 6 Fine mesh filter The pipes between the product and the storage cylinder should be kept as short as possible.
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Page 12: Putting Into Service
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 coun- try 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. -
Page 13: Flushing The Heat Exchanger
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). - Page 16 RIELLO S.p.A. Via Ing. Pilade Riello, 7 37045 - Legnago (VR) The manufacturer strives to continuously improve all products. Appearance, dimensions, technical specifications, standard equipment and accessories are therefore liable to modification without notice.
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