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The SC ACS 80 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 LFWC controller (PWM control).
The system, which works with a low primary temperature, finds a wide use in thermal solar systems and in underfloor
heating.
3-way mixing valve: estabilishes the inlet water temperature (ideal function for the summer, in which the system exploites
solar thermal panels)
Description
1 DHW mixer in packing
2 Instruction manual
3 Circulation pump assembling instructions
4 Immersion sensors
5 Fuse
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 80
DESCRIPTION
CONTENTS OF KIT
Qty.
1
1
1
2
1
waste
collection
1
cod. Doc-0100461 - Rev. 1 (06/2021)
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Summary of Contents for Riello SC ACS 80
- Page 1 SC ACS 80 DESCRIPTION The SC ACS 80 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 LFWC controller (PWM control).
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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 High efficiency pump 2 Black template frame 3 Black handle with red thermometer (primary circuit) 4 Brazed plate iron steel heat exchanger with insulation 5 3-way mixing valve type “TV3” DN25 with electric actuator NRYC230; 6 Ball valve DN25 with nut 1” ½ 7 Red handle 8 Blue handle 9 Load / drain tap ½”... -
Page 4: Water Circuit
5 Manual air vent valve 10 DN25 ball valve TECHNICAL SPECIFICATIONS DESCRIPTION SC ACS 80 Thermal power supplied 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 at 10-45°C Water draw at 10-45°C with storage cylinder at 55°C... - Page 5 Domestic hot water production graph Mandata primario (°C) Primary inlet (°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. CHARACTERISTIC CURVES FOR PRIMARY CIRCUIT PUMPS Q [l/s] Q [lgpm] max.
- Page 6 DIMENSIONS AND FITTINGS EAFS UACS SC ACS 80 MP - Primary inlet 1" F RP - Primary outlet (return) 1" F EAFS - Domestic cold water 1" F inlet UACS - DHW outlet 1" F RS - Recirculation union 3/4” M...
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Page 7: Wiring Diagram
WIRING DIAGRAM PWM1 Primary circuit pump Ground iPWM2 Recirculation pump phase line L / primary pump PT1000 Recirculation (S1 optional) Neutral line N / primary pump PT1000 primary circuit (S3) Connect to controller terminal VFS1 Puffer high PT1000 Main voltages 230VAC / 50-60Hz Connection on the right part of the terminal board! Main side 230 VAC... -
Page 8: System Schematic
SYSTEM SCHEMATIC Example of wall mounted installation Primary inlet Cold water inlet DHW outlet Recirculation Primary outlet (return) In case of recirculation, provide a suitably sized expansion tank in order to avoid overpressure due to thermal ex- pansion and water hammer. INSTALLATION PRELIMINARY CHECKS Carefully remove the packing and check that the product is complete and undamaged. -
Page 9: Installation On The Wall
Installation 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. The product must be stored in a dry place where it is not subject to frost. - Page 10 Saturation index (PH -0.2<0<+0.2 water heating system. delta) Total hardness °Fr 7-15 The SC ACS 80 hot water mixer is made from materials Conductivity μS/cm 10…500 that conform to the requirements of Ministerial Decree Solid substances mg/l <30...
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Page 11: 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 12: Flushing The Heat Exchanger
FLUSHING THE HEAT EXCHANGER - Intercept the flow and close the ball valves ref. C (AFS) e D (DHW) - Introduce the fluid from the valve ref. D1 - Spill the fluid from the valve ref. C1 for the necessary flushing time. -
Page 13: About The Controller
ABOUT THE CONTROLLER The MFWC controller enables efficient use and operational control of the mixer system. For each of the single setting procedures, the keys are assigned to specific functions and explained. The controller menu contains key words for the measured values and settings, as well as help texts and graphs. Main features of the MFWC controller: - Backlit display showing text and graphic content - Simple viewing of current measurement values... -
Page 14: Terminal Connection Diagram
Other specifications and dimensions Housing ..........3-part, ABS plastic Overall dimensions . -
Page 15: Menu Sequence And Menu Structure
DISPLAY AND PROGRAMMING Display The display (1), with full text and graphics mode, is self-explanatory to all intents and purposes, making the controller easy to use. The LED (2) lights up green when a relay is activated. The LED (2) lights up red when the operating mode is "Off". -
Page 16: Commissioning Help
The following menus are available 1. Measured values Measured sensor values 2. Statistics Operating hours counters 3. Operating mode Automatic mode, manual mode, or controller Off 4. Settings Management of parameters required for normal operation 5. Protections Functions for preventing damage to the system and injury to users 6. -
Page 17: Measured Values
1.MEASURED VALUES Menu “1. Measured values” indicates the current temper- 1.Exit Measured values atures measured. Quit the menu by pressing “esc” or se- lecting “Exit Measured values”. 1.1.Hot water 0°C 1.2.Flow rate 0 l/min If “Error” appears on the display instead of the measurement value, then there may be a defective or incorrect temperature sensor. -
Page 18: Operating Mode
3. OPERATING MODE Menu “3. Operating mode” allows selection of the desired 3.Exit operating mode mode of operation: automatic, off, or manual. 3.1.Auto To quit the menu, press “esc” or select “Exit operating mode”. 3.2.Manual 3.1 Automatic Info Automatic is the normal operating mode of the controller. Only automatic mode guarantees correct operation of the system, taking account of the current temperatures and the selected parameter settings! -
Page 19: Protective Functions
4.4.3 Circ. hysteresis = Switch-off hysteresis of the circulation pump If the temperature exceeds TminS2 by this value, the circulation pump is switched off. 4.4.4 Circ. maximum Flow rate = Maximum flow rate of the circulation pump If the flow rate measured at sensor 6 exceeds this value (because water is being drained from the system) the circulation pump is switched off. -
Page 20: Special Functions
5.3 Discharge Protection If the temperature in the primary circuit is not always guaranteed to suffice, this function is used. With this function activated: When no storage sensor is connected: If the setpoint temperature is not reached after 60 seconds, the currently measured temperature -3°C is used as new setpoint temperature. - Page 21 The indicated percentages are guide values that may vary to a greater or lesser extent depending on the system, pump and pump stage. 6.2.2 Min speed This is where the minimum speed of the pump connected to relay R1 is set. During the setting procedure, the pump runs at the selected speed so that the flow rate can be determined.
- Page 22 Adjustable flow rate in l/h, at which the additional pump is switched on. 6.5.8.3. Flow rate off Adjustable flow rate in l/h, at which the additional pump is switched off. 6.5.8.4. Delay The additional pump is switched on with a delay of the time set here. 6.5.9 Primary mixer By activating this function, the water in the primary circuit is mixed with that of the return through a mixing valve.
- Page 23 6.5.11.3. Followup time Follow up time for the relay after output V1/V2 is switched off. 6.5.12. Parallel operation V2 Activates in parallel the relay assigned with V2 0-10 V / PMW output. (see 6.5.9.) 6.5.13. Always on Relay is permanently switched on. High efficiency pumps with a 0-10V / PWM signal can be powered using the additional function “Always on”...
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Page 24: Service Data
When this function is active, the controller’s clock changes automatically to and from DST (DST, Daylight Saving Time). 6.14. Eco display mode When this function is active, the controller’s backlight is automatically switched off when no button has been pressed for 2 minutes. -
Page 25: Malfunctions And Error Messages
MALFUNCTIONS MALFUNCTIONS AND ERROR MESSAGES If the controller detects a malfunction, the red LED blinks and the warning symbol appears on the display. If the malfunction resolves itself, the warning symbol becomes an information symbol and the red LED stops (Flashing LED + blinking. - Page 26 DEFAULT PARAMETER SETTINGS TABLE MENU DESCRIP- SETTINGS RAN- NOTE DESCRIPTION DEFAULT SC ACS 80 NOTE TION 4. SETTINGS T set 30°C ÷ 90°C 45°C T max. 50°C ÷ 95°C 55°C "1÷12 / 1÷20 / 2÷40 / VFS type 5÷100 l/min 5÷100 / 10÷200 /...
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Page 27: Menu Description
MENU DESCRIP- SETTINGS RAN- NOTE DESCRIPTION DEFAULT SC ACS 80 NOTE TION 6.2.2 Min. speed 10 ÷ 95 % RECIRCULATION V2 Pump Recirculation pump 6.3.1 Pump type 0 - 10V -PWM PWMs 6.3.2 Pump (Solar) Recirculation 6.3.3 Output signal normal / inverted Normal 6.3.4... - Page 28 RIELLO S.p.A. Via Ing. Pilade Riello, 7 37045 - Legnago (VR) www.riello.com The manufacturer strives to continuously improve all products. Appearance, dimensions, technical specifi cations, standard equipment and accessories are therefore liable to modifi cation without notice.