Functions
The controller acquires the room temperature with its integrated sensor or external
room temperature sensor (QAA32) or external return air temperature sensor (QAH11.1)
– if used (optional with the RCC10) – and maintains the setpoint by delivering control
commands to the 2-point-valve.
The switching differential with the
•
RCC10 is adjustable; it can be 1 or 4 K in heating mode and 0.5 or 2 K in cooling
mode
•
RCC10.1 is fixed; it is 2 K in heating mode and 1 K in cooling mode
The fan is switched to the selected speed via control output Q1, Q2 or Q3.
When the function “Temperature-dependent fan control“ is activated (can be selected
with DIP switch no.1), the fan is switched on / off depending on the temperature, that is,
together with the valve.
It is switched off by
•
leaving the heating or cooling sequence, provided the function “Temperature-
dependent fan control “ is activated, or
•
manually changing to standby , provided plant conditions do not call for frost
protection mode (only with the RCC10), or
•
activating an external operating mode changeover switch, provided plant conditions
do not call for energy saving or frost protection mode (only with the RCC10), or
•
turning the controller’s power supply off.
The heating or cooling valve receives the
OPEN
command via control output Y11 when
1. the measured room temperature lies by half the switching differential below the
setpoint (heating mode) or above the setpoint (cooling mode), and
2. the valve has been fully closed for more than one minute.
The heating or cooling valve receives the
CLOSE
command via control output Y11
when
1. the measured room temperature lies by half the switching differential above the
setpoint (heating mode) or below the setpoint (cooling mode), and
2. the valve has been fully open for more than one minute.
Note: control output Y12 delivers a control command which is inverted to the control
command at output Y11 and can be used for normally open valves
The RCC10 provides control either depending on the measured room temperature or
depending on the fan coil unit’s return air temperature. Changeover is automatic if a
QAH11.1 cable temperature sensor is connected.
Fan operation
Heating and
cooling mode
ON
OFF
Return air tempera-
ture
2
