Data Sheet for Product

ManualsBrandsSiemens ManualsBuilding automationHBRAS Report sponsored by Siemens

CE1N3577en

27.05.2004

Siemens Building Technologies

HVAC Products

577

ACR12.481/ALG

Heat Pump controller

for wall mounting

ACR12.481

ON / OFF outputs for controlling a compressor and a reversing valve

Modulating output for an electric heater (if available)

P or PI control behaviour selectable

3-speed fan control, automatic and manual

Configurable for single cooling mode or for manual or automatic switching

between heating and cooling.

Potential-free input for window contact or occupancy detector

Inbuilt room temperature sensor or external return air sensor

Alarm input for heat pump alarms

Three operating modes: Comfort / Economy / Standby

The status of the operating mode switch

( Î ) and the changeover switch

(

/ ) are memorised at power failure.

Summary of content (14 pages)

PAGE 1
3 577 ACR12.481/ALG ACR12.481 Heat Pump controller for wall mounting ON / OFF outputs for controlling a compressor and a reversing valve Modulating output for an electric heater (if available) P or PI control behaviour selectable 3-speed fan control, automatic and manual Configurable for single cooling mode or for manual or automatic switching between heating and cooling.
PAGE 2
Use For controlling the room temperature in individual rooms and zones which are heated and cooled with standalone heat-pumps. The controllers are suited for single mode heat-pumps as well as for heat-pumps with a reversing valve or with an electric heater. This is achieved by managing the following equipment: • a 3-speed fan • a compressor • a reversing valve or an electric heater Functions • Changeover between heating and cooling operation automatically or manually.
PAGE 3
If no external sensor is connected and the terminals B2 and M are short-circuited, then the internal sensor is used automatically. Setpoints For comfort operation, the set-points can be defined in the parameter mode. The heating set-point is normally set to 21 °C and the cooling set-point to 23 °C. The room user can adjust the set-points within the limits defined by P13 (maximum ± 6 K). This produces a maximum set-point range of the default set-points of 15...27 °C in heating operation and 17...
PAGE 4
Cooling with compressor, heating with electric heater Y [%] YHE YC 100 80 QH Xp QH QK Xp Y YHE YC YR WH 3575D03 50 WK Xdz Heating demand Cooling demand P-band Positioning variable Electric heater output Compressor output Reversing valve output WH WK 50% QK Xp Heating set-point Cooling set-point Electric heater If no reversing valve is available then the output of the controller can be used for switching an external relay for an electric heater.
PAGE 5
With 10 % control of the heating or cooling valve, the fan switches to speed I, with 80 % to speed II and with 100 % to speed III. The switching hysteresis of the fan speeds are shown in the following diagram. QH [%] 100 80 50 10 Xp 0 WH 3575D04 Q3 Q2 Q1 0 Xdz 10 50 WK 80 100 Xp QK [%] Ventilation in neutral zone OFF. (parameter P08 = 1). If a return air sensor is used (B2, M) then the fan is switched ON for 2 min every 30 min.
PAGE 6
If an alarm occurs then all outputs are switched off and the text “Err” is shown in the display. The operating mode is switched to standby and nothing can be done until the alarm disappears. When it disappears, the pointer to the standby sign ( ) appears in the display in addition to “Err”. By pressing the Standby / AUTO /Fan-speed key, the alarm can now be reset and the operating mode is changed back to AUTO and the text “Err” disappears.
PAGE 7
Wiring diagrams Circuit with normally closed contacts. (Parameter P03 = 1) Window Contact Nbr. 1 GND DU1 ACR12.481 Nbr. 1 Window Contact Nbr. 2 GND DU1 ACR12.481 Nbr. 2 Circuit with normally open contacts. (Parameter P03 = 0) Window Contact Nbr. 3 GND Window Contact Nbr. 1 DU1 GND ACR12.481 Nbr. 3 DU1 ACR12.481 Nbr. 1 Window Contact Nbr. 2 GND DU1 ACR12.481 Nbr. 2 Window Contact Nbr. 3 GND DU1 ACR12.481 Nbr. 3 Parameters 15 parameters (P01...
PAGE 8
Nbr.
PAGE 9
Terminal assignment GND DU1 DU1 GND M B2 N, L Y1 Q1 Q2 Q3 Y10 M B2 N N L N Y1 Q1 Q2 Q3 Y10 Operating mode control input, SELV Measuring neutral for control input Measuring neutral for sensor Return air sensor QAH11.
PAGE 10
A max L T B2 AC 230 V / 50/60 Hz SA B2 L M DU1 GND SELV N Q1 Q2 Q3 3 N S1 760 VA max. N Y10 N Y1 YC M1 3577D07 Heat pump with electric heater and return air sensor and alarm input. 3.5 VA max. YHE 3.5 VA max. The alarm contact is wired serially with the return air sensor. An open input at B2, M means alarm. The compressor is operated through an external relay YC. The electric heater is also operated through an external relay YHE.
PAGE 11
• The connecting wires inside the controller must be placed such that no pressure will be exerted on components when the cover of the controller is closed (also refer to Installation Instructions G3577). • The outputs to the fan motor are micro interruptions only. This means, that in error cases more than one output can be switched on at the same time.
PAGE 12
Technical data Operating voltage L, N Frequency Power consumption Max. fuse in supply line AC 230 V ±10 % 50 / 60Hz 3 VA (without field devices) 10 A Overvoltage category III Electrical connections Max. cross-sectional area per terminal 2 wires each with 1.5 mm2 or 1 wire with 2.5 mm2 Outputs Fan control Q1, Q2, Q3 Max. load, cos ϕ > 0.9 Type of automatic action according to EN60730 AC 230 V 3.3 A 1.
PAGE 13
98 135 143 Dimensions 3575M01 39 43 56 85,5 143 30 58 28 28 2,2 7,4 4,1 61,6 98 13/12 Siemens Building Technologies HVAC Products Heat-pump controller for wall mounting ACR12.481 CE1N3577en 27.05.
PAGE 14
/12 Siemens Building Technologies HVAC Products 2004 Siemens Building Technologies Ltd Subject to change Heat-pump controller for wall mounting ACR12.481 CE1N3577en 27.05.