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

The water temperature acquired by the changeover sensor (QAH11.1 + ARG86.3) is
used by the controller to switch from heating to cooling mode, or vice versa. When the
water temperature lies above 28 °C, the controller switches to heating mode, below
16 °C it switches to cooling mode. If, immediately after switching on, the water tempera­ture lies between the 2 changeover points, the controller will start in heating mode. The
water temperature is measured at minute-intervals and the operational status updated.

Heating mode Cooling mode Automatic changeover

1

0

SDH

Y11

W

3021D01

T [°C]

1

0

SDC

Y11

W

T [°C]

3021D02

CM

HM

M

TW [°C]

3021D03

16 28

CM Cooling mode TW Water temperature

HM Heating mode w Room temperature setpoint

M Operating mode Y11 Manipulated variable “Valve“

SDC Switching differential “Cooling“ T Room temperature

SDH Switching differential “Heating“

The task of the changeover sensor is to initiate the change from heating to cooling
mode even if the two-port valves are shut down for a longer period of time. To ensure
this function, the valves are opened for one minute at 2-hour intervals during off hours.
(Note: this function is not effective when using thermal actuators)

The room temperature setpoint can be limited in increments of 1 K by making use of
the minimum and maximum limitation facility. Arbitrary setpoint readjustments can thus
be prevented.

Operating modes

The following operating modes are available:

Heating or cooling mode with automatic changeover and with manually selected fan
speed III, II or I. In normal operation, the controller maintains the adjusted setpoint.

The frost protection function is activated only when DIP switch no.4 is set to OFF.
Frost protection mode can be activated either

• by manually switching to standby

.

• by activating the external operating mode changeover switch, provided DIP switch

no.2 is set to OFF

If the room temperature falls below 8 °C, the controller will automatically switch to frost
protection mode. In that case, the heating valve opens and the fan operates at the se­lected speed. If the operating mode selector is in position standby

, the fan will oper­ate at speed I. The room temperature is maintained at a setpoint of 8 °C and the set­point adjusted by the user will be ignored.
If frost protection mode is locked (DIP switch no.4 in position ON), standby is locked
also, which means that the controller will not switch to standby but to OFF:

In energy saving mode, the setpoint of heating is 16 °C and the setpoint of cooling 28
°C, independent of the position of the setpoint knob. This operating mode will be acti­vated when input D1 for operating mode changeover is active and DIP switch no.2 is
set to ON.

Automatic
changeover

Purging function

Energy saver

Normal operation

Frost protection mode
(only with the RCC10)

Energy saving
mode

3

To avoid damage due to moisture in very warm or humid climatic zones resulting from
lack of air circulation in energy saving mode, the fan will not be switched off when se­lecting the function “Temperature-independent fan control“ (with DIP switch no.1)

A changeover switch can be connected to status input D1-GND. When the switch
closes its contact (caused by an open window, for instance), the operating mode will
change from normal operation to energy saving mode (provided DIP switch no.2 is set
to ON), or from normal operation to standby (provided DIP switch no.2 is set to OFF). If
the room temperature falls below 8 °C and if DIP switch no.3 is set to OFF, frost protec­tion mode will become active.
The operating action of the switch (N.C. or N.O.) can be selected.

Type summary

Type reference Features

RCC10

With input for return air temperature sensor

RCC10.1

Without input for return air temperature sensor,
without frost protection function

Mechanical design

The unit consists of two parts:

• A plastic housing which accommodates the electronics, the operating elements and

the built-in room temperature sensor

• A mounting base

The housing engages in the mounting base and snaps on.

The base carries the screw terminals. The DIP switches are located at the rear of the
housing.

Avoiding damage
resulting from mois­ture
(only with the RCC10.1)
Operating mode
changeover switch

4

3021Z01

256 13 4

1. Operating mode selector

(standby

, heating or cooling mode with manual selection of fan speed)

2 LEDs for indicating heating mode, cooling mode and fan operation

3 Setting facility for minimum setpoint limitation

(in increments of 1 K)

4 Setting facility for maximum setpoint limitation

(in increments of 1 K)

5 Room temperature setpoint knob

6 Set of DIP switches

DIP switch no. Meaning Position ON Position OFF

1 Fan control

Fan control is temperature­dependent in all operating

modes

Fan control in normal operation (and in
energy saving mode with the RCC10.1) is

temperature independent1)

2

Operating mode change­over via external switch

Changeover between normal
operation and energy saving

mode

Changeover between normal operation
and standby 1)

32)

Operating action of switch
for external operating
mode changeover

Changeover activated when
contact of switch is closed

(N.O.)

1)

Changeover activated when contact of
switch is open

(N.C.)

42)

Standby

Frost protection function not
enabled

Frost protection function enabled 1)

52) Switching differential

1 K in heating mode

1)

0.5 K in cooling mode

1)

4 K in heating mode
2 K in cooling mode

1) Factory setting

2) Only with the RCC10

The RCC10.1 comes with the following fixed settings:

• Switching differential in heating mode: 2 K

• Switching differential in cooling mode: 1 K

• Standby: OFF, no frost protection

• Operating action of switch for external

operating mode changeover: N.O.

Accessories

Description Type reference

Adapter plate 120 x 120 mm for 4“ x 4“ conduit boxes ARG70
Adapter plate 96 x 120 mm for 2“ x 4“ conduit boxes ARG70.1
Adapter plate for surface wiring 112x130 mm ARG70.2

Setting and operating
elements

Legend

5

Engineering notes

In systems with automatic changeover, the temperature sensor can be replaced by an
external switch for manual changeover.
In systems with continuous heating operation, no sensor will be connected to the con­troller’s input.
With continuous cooling operation, the controller input (B2–M) must be bridged.

Mounting location: on a wall or inside the fan coil unit. Not in niches or bookshelves, not
behind curtains, above or near heat sources and not exposed to direct solar radiation.
Mounting height is about 1.5 m above the floor. The connecting wires can be run to the
controller from a recessed conduit box.

Check the settings of the DIP switches no.1 through no.5 (with the RCC10) and of no.1
and no.2 (with the RCC10.1) and change them, if required. If setpoint limitation is re­quired, use the minimum and maximum limitation facility (energy saver). After applying
power, the controller makes a reset during which the fan LED flashes, indicating that
the reset has been correctly made. This takes about 3 seconds. Then, the controller will
be ready to operate.

• Prior to fitting the changeover sensor, thermal conductive paste must be applied to

the location on the pipe where the sensor is placed

• The cables used must satisfy the insulation requirements with regard to mains poten-

tial

• Sensor inputs B1–M and B2–M carry mains potential. If the sensor’s cables must be

extended, the cables used must be suited for mains voltage

The controller is supplied with Mounting Instructions.

Technical data

Operating voltage AC 230 V +10/-15 %
Frequency 50/60 Hz
Power consumption max. 6 VA
Control outputs Q1, Q2, Q3

Rating

AC 230 V
max. 600 VA

Control output Y11 (N.O. contact)

Rating

AC 230 V
max. 300 VA

Control output Y12 (N.C. contact)

Rating

AC 230 V
max. 300 VA

Signal input B1 for return air sensor QAH11.1, Safety class II

NTC resistor 3kΩ at 25°C

Signal input B2 for changeover-sensor QAH11.1, Safety class II

NTC resistor 3kΩ at 25°C

Mounting, installation
and commissioning
notes

Power supply

6

Status input D1 and GND
Contact sensing
Insulation against mains
Operating action
With the RCC10
With the RCC10.1

SELV DC 6-15V / 3-6 mA
4 kV, extra insulation

selectable (N.O. / N.C.)
(N.O.)

Perm. cable length with copper cable 1.5 mm

2

for connection to terminals B1, B2 and D1

80 m

Setpoint setting range 8...30 °C

Max. control deviation at 25 °C max. ±0.7 K

Switching differential in heating mode SDH

(selectable)

1 K or 4 K

Switching differential in cooling mode SDC

(selectable)

0.5 K or 2 K

Setpoint «Energy saving mode », heating 16 °C
Setpoint « Energy saving mode », cooling 28 °C
Setpoint «Standby » 8 °C
Operation

Climatic conditions
Temperature
Humidity

to IEC 721-3-3
class 3K5

0...+50 °C
<95 % r.h.

Transport

Climatic conditions
Temperature
Humidity
Mechanical conditions

to IEC 721-3-2
class 2K3

−25...+70 °C

<95 % r.h.
class 2M2

Storage

Climatic conditions
Temperature
Humidity

to IEC 721-3-1
class 1K3

−25...+70 °C

<95 % r.h.

conformity to

EMC directive
Low voltage directive

89/336/EEC
73/23/EEC and 93/68/EEC

N474

C-Tick conformity to

EMC emission standard

AS/NSZ 4251.1:1994

Product standards

Automatic electrical controls for household and
similar use

EN 60 730 – 1 and
EN 60 730 – 2 - 9

Electromagnetic compatibility

Emissions
Immunity

EN 50 081-1

EN 50 082-1
Safety class II to EN 60 730
Pollution class normal
Degree of protection of housing IP 30 to EN 60 529
Connection terminals Use solid wires or prepared

stranded wires.

2 x 0.4-1.5 mm

2

or 1 x 2.5 mm2
Weight 0.25 kg
Colour of housing front white, NCS S 0502-G (RAL9003)

Operational data

Environmental
conditions

Norms and standards

General

7

Connection terminals

LB1*MB2 D1GND

NQ1Q2Q3 Y11N

3021G01

Y12

SELV

L, N Operating voltage AC 230 V
B1* Status input “Return air temperature sensor“
M Measuring neutral “Return air temperature
sensor“
B2 Status input “Changeover sensor“
D1, GND Status input for potential-free operating mode
changeover switch
(operating action can be selected)
Q1 Control output “Fan speed I“ AC 230 V
Q2 Control output “Fan speed II'“AC 230 V
Q3 Control output “Fan speed III'“ AC 230 V
Y11 Control output '“Valve“ AC 230 V
(N.O. contact, for N.C. valves)

Y12 Control output “Valve“' AC 230 V
(N.C. contact, for N.O. valves)

* Only with the RCC10

Connection diagrams

L

LB1 M B2

D1

GND

Q1 Q2 Q3 Y11 N

NNI II III

N

B1* B2

S1

N1

M1 Y1

3021A01

Y12

B1* Return air temperature sensor (QAH11.1)

B2 Changeover sensor

(QAH11.1 temperature sensor + ARG86.3

changeover mounting kit)

M1 Three-speed fan

N1 RCC10 / RCC10.1 room temperature

controller

S1 External operating mode changeover switch

Y1 MVE... / MXE... zone valve

* Only with the RCC10

Dimensions

96,6

114,15

42,8

3021M01

90

4

4

3021M02

28 28

2828

26

30

3530

11,8

104

4

Unit/baseplate

8

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LXRCC10-AGU-0509-E

Due to Lennox’s ongoing commitment to quality, the Specifications, Ratings and Dimensions are subject
to change without notice and without incurring liability.
Improper installation, adjustment, alteration, service or maintenance can cause property damage or
personal injury.
Installation and service must be performed by a qualified installer and servicing agency

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