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EQJW 24

Product catalog summary

Overview: The EQJW 245 is a heating controller designed for local or district heating systems, featuring two independent control loops to optimize energy efficiency through time-optimized switching and temperature limitations for both heating and drinking water.

Key Features:

Weather-dependent supply-temperature control and drinking water heating.
User-friendly interface with a large LCD.
Communication via Modbus/RTU or proprietary device bus.
Weekly and calendar switching programs with optimized switching times.
Automatic summertime/wintertime changeover.
Frost-protection and anti-jamming functions for valves and pumps.
Screed curing and legionella protection functions.
Connection options for room temperature sensors or operating units.
Relay outputs for control units and pumps, with additional multifunctional relay output.
Manual mode and logbook for system irregularities.

Technical Specifications:

Power Supply: 230 V~, ±15%, 50...60 Hz.
Control Characteristics: Supply temperature PI control, drinking water 2-point control.
Temperature Ranges: Supply and return temperatures 0...140 °C, outside temperature –50...50 °C, domestic-hot-water temperature 20...90 °C.
Inputs/Outputs: 8 relay outputs, 1 digital or pulse input, 8 analogue inputs.
Interfaces: RS-485, Modbus, device bus (TAP).
Structural Design: Weight 0.4 kg, housing dimensions 144 mm × 96 mm.

Operation and Functionality:

Manages up to two separate weather-dependent controls for secondary supply temperature and drinking-water control.
Temperature sensors provide precise measurements for outside, supply, return, drinking water, and room temperatures.
Microprocessor calculates output signals based on setpoints, control parameters, and operating mode.
Switching programs allow for individual adaptation to optimize comfort and energy consumption.
Frost-protection and temporary temperature change functions enhance system efficiency and flexibility.
Modbus interface enables communication and connection with multiple controllers and room operating units.

Intended Use: The EQJW 245 is intended for use as described in the operation section, adhering to all related product regulations. Modifications are not permissible.

Engineering Notes: The controller must remain connected to the mains power supply year-round.

Special Functions:

Room-temperature connection and frost-protection facility are adjustable on the SERVice level.
Anti-jamming function for pumps activates daily if not operated for 24 hours.
Multifunctional relay output can be configured for various functions.
Supply and return temperature limitations are set on the SERVice level.
Anti-legionellae function increases drinking water temperature at regular intervals.
Optimizing switching times ensures energy-efficient operation.

Functionality Overview: The EQJW 245 device includes a primary function accessible at the service level, with an additional function for screed curing. It supports four weekly switching programs with up to 48 commands each and a calendar switching program with up to 20 commands. The minimum switching interval is 10 minutes or 1 day, prioritizing energy-efficient modes.

Temperature Management: The device detects outside temperature and communicates it to other controllers via a device bus. Parameterization occurs at the communication level.

Logbook and Communication: A logbook records events like control offsets or incorrect measurements, secured by a password. The EQJW 245 communicates via an RS 485 interface using the Modbus/RTU protocol, functioning as a slave device.

Notification System: Alarm texts can be sent as SMS to mobile phones using a modem and the TAP protocol.

Disposal and Environmental Information: Disposal must comply with local laws, with additional material information available in the product's environmental declaration.

Heating Characteristics: The document includes a graph showing heating characteristics for a foot point temperature of 20°C, with various slopes and outside temperatures.

Control Models: Eight different control models are described, focusing on weather-dependent supply-temperature control for various heating circuits and drinking water systems.

Technical Drawings: The document provides a connection diagram and dimension drawing for installation reference.

Catalog excerpts

EQJW 245: Heating controller with two control loops for local or district heating, equitherm How energy efficiency is improved Function for time-optimised switching on/off of heating. Limitation of the maximum admissible temper- atures for the heating and the drinking water ■ Weather-dependent supply-temperature control and heating of drinking water ■ Convenient to use with modern operating concept (turn and press) and large LCD • Communication via Modbus/RTU or proprietary device bus • Convenient weekly and calendar switching programmes with optimisation of switching times • Automatic summertime/wintertime changeover • Two independent control loops • Min./max. limitation for supply and return temperatures • Frost-protection facility and anti-jamming function for valve and pump • Screed curing (floor-drying function) • Function for protecting against legionellae • Connection of room temperature via room-temperature sensors or room operating unit ■ Nil 000 inputs for the outside, supply, drinking water, return flow and room temperatures or for the room operating unit • Relay outputs for activating control units, pumps, additional multifunctional relay output • Pulse input for measuring and limiting flow or energy • Manual mode • Notification by text message Technical data Power supply Control characteristic Supply temperature_ PI control _ Control parameters Proportional band_2...100 K_ Integral action time 15...1000 s Switching difference for drinking wa- 1 ...19 K Temperature ranges Normal temperature_0...40 °C_ Running time of valve 30...300 s_ Cycle time Running time of the valve + 15 Ambient conditions Admissible ambient temperature 0...50 °C Admissible ambient humidity 5...95% rh, no condensation Storage and transport temperature -25...65 °C_ Number of outputs 8 relays SAUTER Right of amendment reserved © 2015 Fr. Sauter AG

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Product data sheet Configurable relay3) Number of inputs Switching current approx. 1mA Analogue inputs Operation Timer 1 digital or pulse, 8 analogue Digital inputs 6 Ni1000, 2 Ni1000 or room operating unit Back-up power supply Number of switching commands Weekly switching programme Min. switching interval Calendar switching programme Number of switching commands RS-485, device interface (similar to RS-232) Housing material Fire-retardant thermoplastic Structural design Wall, panel and top-hat rail Screw terminals Standards and directives Type of protection (when fitted in pan- IP 40 (EN 60529)...

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Product data sheet controller. The microprocessor in the controller uses these values to calculate the signals for the outputs. Using the stored control model, the calculation of the output signals is based on the specified setpoints, the current control offset, the set control parameters and the operating mode, along with the current actual values. These signals are processed further via switching amplifiers. The results are the ON/OFF commands of the relay outputs for the control unit(s) and the pumps. The room is supplied with the heat required to keep the room temperature constantly at the...

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Product data sheet Actual value Actual value of the supply temperature Room-temperature setpoint Additional technical data Measuring accuracy Time constant for processing of measured values Neutral zone for supply temperature Minimum pulse duration for control 250 ms unit Follow-on time for heating pump Heating characteristic Curved, without influence of extraneous heat Damping of outside temperature Can be set on the SERVice level with time constants up to approx. 48 hours; can be (de)activated Summertime/wintertime heating limit ON means summer → winter OFF means winter → summer ON for Taged<...

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Product data sheet Anti-jamming function for pump The anti-jamming function for the pump is enabled on the SERVice level. Every day at midday, a pump is activated for approx. 60 seconds if it has not been operated for the previous 24 hours. This function is active in all operating modes apart from the manual mode. Multifunctional relay output One of the output relays (terminal 12) can be parameterised for a wide range of functions. This means the output can be used as a pilot clock output, as a collective alarm, for controlling a circulation pump or a 2nd charging pump. It is also possible to...

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Product data sheet Characteristics Heating characteristics for foot point TI = 20 °C Slope 2,5 Flow temp. Outside temp. Limiting characteristic of the return temperature TRF max. TL0 (RF) TL0BW (RF) Control models • Weather-dependent supply-temperature control (secon- • Weather-dependent supply-temperature control (secondary) with additional control valve in the secondary cir- dary) with drinking-water control via control valve in the cuit for 2nd heating circuit • Weather-dependent supply-temperature control (secon- • Weather-dependent supply-temperature control for 2 dary) for a maximum of...

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• Weather-dependent supply-temperature control and drinking water circuit via separate control valve • Weather-dependent supply-temperature control for 2 zones with connection of the drinking water circuit via a control valve • Weather-dependent supply-temperature control for one zone via a control valve and direct connection of the drinking water circuit and a second zone • Weather-dependent supply-temperature control (secon- dary) and direct connection without mixing control for drinking water circuit Connection diagram WSAUTER Right of amendment reserved © 2015 Fr. Sauter AG

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EQJW 24

EQJW 24

Catalog excerpts

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