Data Sheet for Product

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Building Technologies Fan-coil controller for wall mounting ACR12 CE1N3578en
HVAC Products 03.10.2005
Application
For controlling the room temperature in individual rooms and zones which are heated
and cooled by fan-coils. The controllers are suitable for 2- or 4-pipe applications with
manual and automatic fan control. They control:
• a 3-speed fan
• either two valve actuators for 4-pipe applications
• or one valve actuator and an electric heater for 2-pipe applications.
Functions
• Changeover between heating and cooling operation is either automatically, driven by
the room temperature (4-pipe) or with the changeover sensor QAH11 (2-pipe) or
manually.
• Selection of operating mode with a window contact, an occupancy detector or the
standby button on the controller.
• Control of 3 fan speeds automatic or manual
• Outputs for one (REF7090521, REF7090523) or two (REF7090520, REF7090522)
thermal valves with pulse duration modulation for heating and /or cooling, AC 230 V
• REF7090521, REF7090523 with relay output for an electric heater with up to 2 kW.
Type summary
Note that the type references which are in brackets in the table below are for
comparison reasons only.
Application Operating panel Type reference
Analogue
REF7090521
(ACR12.420/ALG)
2-pipe fan-coil with or
without electric heater
With display
REF7090523
(ACR12.421/ALG)
Analogue
REF7090520
(ACR12.440/ALG)
4-pipe fan-coil
With display
REF7090522
(ACR12.441/ALG)
Cable sensor for changeover or return air temperature
Valve actuator for VD100 valve or V_P46 valve
Valve actuator for V_P47
QAH11
STA21 *
STP21 *
* max. 1 actuator per output is allowed
Ordering
When ordering, please specify the type references as shown in the „Type summary“.