Data Sheet for Product

10/16
Building Technologies Fan-coil controller for wall mounting ACR12 CE1N3578en
HVAC Products 03.10.2005
(3) All controllers can be set to either 2 or 4 pipe controllers. The difference between
the REF7090521 or REF7090523 and the REF7090520 or REF7090522 is the re-
lay instead of the second valve output. The default setting of P09 and P10 for
REF7090521 or REF7090523 is "ON" or 1 and for REF7090520 or REF7090522
"OFF" or 0. If the REF7090520 or REF7090522 controllers are used to control an
electric heater, then an external relay must be used and P09 and P10 must be set
accordingly.
(4) This setting defines that the C/O is set to heating only when the water temperature
goes above 39 °C and that the fan-coil is completely switched off if the water tem-
perature falls below 35 °C (in heating mode).
(5) The modulating action on valve actuators is optimised for STA21 or STP21 actua-
tors only.
Terminal assignment
GND
B2
DU1 M
Y1
Y10
Q14*
N
N
L
Q1
Q3
Q2N
REF7090520 and REF7090522 // * REF7090521 and * REF7090523
GND
Measuring neutral for
control input
DU1 Operating mode control input, SELV
L, N Power supply AC 230 V
M
Measuring neutral for sensor
B2 Changeover- or return air sensor QAH11
Y1 4-pipe application / control output for valve (heating) / AC 230 V
2-pipe application / control output for valve (heating or cooling) / AC 230 V
Q1 Control output for fan speed 1 / AC 230 V
Q2 Control output for fan speed 2 / AC 230 V
Q3 Control output for fan speed 3 / AC 230 V
4-pipe application / control output for valve (cooling) / AC 230 V Y10
2-pipe application / control output for external heater relay / AC 230 V
Q14 Control output for electric heater / AC 230 V