Lennox LXRCC10 Application Manual
Providing indoor climate comfort
Application guide
LXRCC10-AGU-0509-E
LXRCC10 Remote control
Room Temperature Controllers
LX
RCC10…
for two-pipe fan coil units
Output for on / off valve actuator
Outputs for three-speed fan
Control depending on the room or return air temperature (RCC10)
Automatic heating / cooling changeover
Operating modes of RCC10: normal, energy saving and frost protection mode or
OFF
Operating modes of RCC10.1: normal and energy saving mode or OFF
Operating mode changeover input for remote control
Function for avoiding damage resulting from moisture (RCC10.1)
Selectable control parameters (RCC10)
Operating voltage AC 230 V
Use
Typical use:
• Control of the room temperature in individual rooms that are heated or cooled with
two-pipe fan coil units.
• For opening or closing a valve and for switching a three-speed fan.
Suitable for use in systems with
• automatic heating / cooling changeover
• continuous heating or cooling operation.
1
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 temperature
2
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