Siemens RLE132 User Manual

CE1N3334en
2015

-03-06

Buil

ding Technologies

HVAC Products

3

334

Synco™ 100

Immersion Temperature
Controller

RLE132

with 3

-position output

Immersion temperature controller for basic heating plants. Compact design with
3-position control. Used as a controller, minimum or maximum limiter.

Use

Plant types:

• Heating zones in heating plants

• Heating section of ventilation or air conditioning plants

• Flow temperature in heating plants

• DHW temperature

• Heat exchanger control

• Calorifier control

Building types:

• Residential buildings of all types

• Non-residential buildings of all types

Used as a limiter:

• Heating plants controlled by a heating controller with 3-position control, e.g. RVL4…,
RVP3…, RVP2…

Devices that can be controlled:

• Actuators with 3-position control

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Siemens Immersion temperature controller RLE132 CE1N3334en
Building Technologies 2015-03-06

Functions

• Control of the water temperature through 3-position control of a seat or slipper valve

• Minimum or maximum limitation of the flow or return temperature, or minimum

limitation of the boiler return temperature

• Outside temperature compensation

• Remote setpoint adjustment

• Setpoint changeover via external contact, can be selected to provide temperature

setback or legionella function

• Frost protection

• Load-dependent switching contact (e.g. for pump release)

• Test mode as a commissioning aid

Ordering

When ordering, please give type reference RLE132.

Equipment combinations

Actuators must meet the following specification:

• 3-position control

• Control contacts suited for AC 24…230 V, 2 A

• Running times:

− ≥30 s (30 s or 35 s)

− ≥120 s (120 s, 125 s, 135 s, 150 s or 160 s)

For auxiliary functions, the following products can be used:

Type of unit

Type ref.

Data Sheet

Outside sensor (for outside temperature compensation)

QAC22

N1811

Remote setpoint adjuster

BSG21.1

N1991

Scale 0…130 °C for remote setpoint adjuster

BSG-Z

N1991

As a limiter, the RLE132 can be used in connection with the following types of heating
controllers:

Type reference

Data Sheet

RVL470

N2522

RVL471

N2524

RVL472

N2526

RVP201, RVP211

N2464

RVP300

N2474

RVP310

N2475

RVP320

N2476

RVP330

N2477

RVP331

N2478

Technical design

When the water temperature deviates from the setpoint, the controller adjusts the
actuating device until the setpoint is reached again. The neutral zone is ±2 K. The
controller calculates and stores the running time of the connected actuator. Fully open
(100 %) corresponds to a heat demand of 100 % (also refer to section “Switching
contact”).
The controller provides 2 modes of operation (for details refer to section “Operating
modes“):

• Control with ECO

Main functions

Other functions

Mode of operation

as a controller

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Siemens Immersion temperature controller RLE132 CE1N3334en
Building Technologies 2015-03-06

• Control with boost

The following settings are required:

• Setpoint

• Control mode: A choice of 4 PI modes are available to suit the type of controlled

system (refer to chapter “Mechanical design”)

• P-band

The control signals of the heating zone controller (RVL4…, RVP3…, RVP2…) are
passed to the RLE132 which acts as a limiter.

1. If the temperature (e.g. the boiler return temperature) falls to a level 4 K above the

minimum limit value, the RLE132 interrupts the OPEN signals of the heating zone
controller. At the same time, it delivers CLOSE commands in the form of pulses to
the mixing valve’s actuator until the temperature rises again.

2. If the temperature falls to the minimum limit value, the RLE132 delivers a constant

CLOSE command to the mixing valve’s actuator until the temperature rises again.

3. If the temperature rises, the RLE132 releases the positioning commands of the

heating zone controller.

1. If the temperature (e.g. the flow temperature) rises to a level 4 K below the

maximum limit value, the RLE132 interrupts the OPEN signals of the heating zone
controller. At the same time, it delivers CLOSE commands to the mixing valve’s
actuator in the form of pulses until the temperature falls again.

2. If the temperature reaches the maximum limit value, the RLE132 delivers a

constant CLOSE command to the mixing valve’s actuator until the temperature falls
again.

3. If the temperature falls, the RLE132 releases the positioning commands of the

heating zone controller.

When using an outside sensor, the RLE132 provides outside temperature
compensation. If the outside temperature falls from +15 to –5 °C, the setpoint will be
continuously raised by 0 K to 26 K. Below an outside temperature of –5 °C, the
temperature increase will be kept constant.

T

A

Outside temperature

w

Current setpoint

wN Nominal setpoint

Where the controller is mounted in an inaccessible location, a remote setpoint adjuster
BSG21.1 can be connected to the RLE132 (terminals R1–M), thus enabling the
setpoint to be adjusted from a remote location. In this case, the controller’s setpoint
setting slider must be set to EXT.

In operating mode Control with ECO, the nominal setpoint is reduced by closing an
external potential-free contact across terminals D1–M.
This ensures energy savings, e.g. through night setback of space heating controlled by
a time switch.

In operating mode Control with boost, the nominal setpoint is raised by closing an
external potential-free contact across terminals D1–M.

Mode of operation

as a limiter

Minimum limitation

Maximum limitation

Outside
temperature

compensation

Remote adjustment

of setpoint

Operating modes

Control with

ECO

(setpoint decrease)

Control with boost
(setpoint increase)