EUROSTER UNI4 Manual de usuario

EUROSTER UNI4 –USER MANUAL 1

EUROSTER UNI4

Weather-based heating system controller

MANUFACTURER: P.H.P.U. AS, Chumiętki 4, 63-840 Krobia, Poland

In order to take full advantage of the controller capabilities and ensure proper operation of the

central heating system, please read this user manual carefully.

Manual version: 01.02.2021

1. APPLICATION

UNI4 is a universal controller designed to control a heating system equipped with:

◼Two independent CH zones with mixing valves (e.g. for floor heating, radiator heating)

◼DHW circuit

◼DHW circulation circuit (time-based control)

◼Heating source control

◼Feeding the buffer which supplies other zones

◼Ability to control cooling or heating zones with a switch-over between heating and

cooling by an external contact.

Heating system diagram

EUROSTER UNI4 –USER MANUAL 2

S1 –Feeding temperature sensor 1

(buffer –top)

S2 –Feeding temperature sensor 2

S3 –Buffer temperature sensor - bottom

S4 –CH1 zone temperature sensor

S5 –CH2 zone temperature sensor

S6 –DHW temperature sensor

S7 –Outdoor temperature sensor

R1 –CH1 zone room thermostat

R2 –CH2 zone room thermostat

1. Feeding source No. 1

2. Feeding source No. 2

3. Buffer tank

PB –Buffer pump (feeding no. 2)

P1 –CH1 zone pump

P2 –CH2 zone pump

P3 –DHW tank feeding pump

P4 –DHW circulation pump

M1 –230 V 3-point actuator of the mixing valve

in CH1 zone

M1 –230 V 3-point actuator of the mixing valve

in CH2 zone

Heating/cooling system diagram

In the case of active cooling, the function of the DHW tank and feeding source

temperature control is unavailable!

S4 –CH1 zone temperature sensor

S5 –CH2 zone temperature sensor

R1 –CH1 zone room thermostat

R2 –CH2 zone room thermostat

P1 –CH1 zone pump

P2 –CH2 zone pump

P4 –DHW circulation pump

M1 –230 V 3-point actuator of the mixing

valve in CH1 zone

M1 –230 V 3-point actuator of the mixing

valve in CH2 zone

1. Controller output for switching on the

heating or cooling device.

2. FUNCTIONS

2.1. CH zones

◼Control of the CH pump and the 3-point actuator of the mixing valve

◼Independent setting of temperature and weather curve for each zone

◼Independent control of each zone with a room thermostat and weekly schedule

◼Possibility to switch off any zone

◼Manual switching between summer and winter season

◼Selection of a zone operating mode if heating is not needed: by turning the pump on or

off or by decreasing the temperature with a mixing valve with the pump being switched

on permanently or by switching on the zone temporarily

◼Cooperation with the floor heating distributors

EUROSTER UNI4 –USER MANUAL 3

◼Switching off the heating automatically in case of outdoor temperature increase.

2.2. DHW circuit –filling the DHW tank

◼Controlling the weekly schedule

◼DHW priority

◼Temporary limitation of DHW priority

◼Disinfection of DHW circuits - with the schedule of periodic disinfection.

2.3. DHW circulation circuit

◼Controlling the weekly schedule

◼Time-base control (without temperature control)

2.4. Feeding

◼Automatic identification of the preset temperature and control of the heating source

◼Weekly schedule of the heating source operation

◼Cooperation with the heat buffer

◼Possible operation with two heating sources

◼Possible operation without feeding temperature sensor (cooperation with heat

distribution units).

2.5. Utility functions

◼Control of a gas-fired boiler or other heating devices with a voltage-free output (NO/NC

relay contacts)

◼Alarm output (230 V 50 Hz output)

◼Event log (the controller stores 15 last alarms or irregular situations)

◼Supported languages: Polish, English, German

◼Possibility to test each output

◼Overheating protection

◼Cooperation with systems with high feeding temperature (up to 110°C) – on customer’s

request

◼Frost protection

◼Anti-Stop algorithm –protection of pumps and valves against seizure.

◼Caution! The controller does not communicate with UNI2 and UNI3 controllers.

3. USER INTERFACE

3.1. Main screen

The following information is shown on the main screen:

◼Zone temperatures: current and preset (calculated with a weather-based algorithm)

◼Active devices (pump, mixer, boiler)

◼Controller status (anti-stop, disinfection, heating season: WINTER/SUMMER and others)

◼Time and date.

An example screen with a description is shown below:

Additional heating source on (feeding no.2, without the buffer)

EUROSTER UNI4 –USER MANUAL 4

Additional heating source on (feeding no.2, with the buffer)

The symbols shown in the controller have the following meaning:

Pump operation

Mixer operation

No icon –thermostat operation off; flashing icon –thermostat operation on; active

symbol - heating switched on by a room thermostat

Anti-Stop algorithm active

Thermal cleansing of DHW

Main heating source active (feeding no. 1) –boiler relay output (NO-COM) shorted

Activated DHW priority function

Additional heating source active (feeding no. 2) –voltage at the buffer pump output

Frost protection switched on

3.2. Multifunction knob

The controller is operated with a multifunction knob. In addition to a rotary face used to

change the set value, it contains 4 buttons used for navigation (selecting between menu items:

up, down, next, previous) and a confirmation button located in the center of the knob, which

also clears the display of alarm warnings.

CAUTION! When changing a setting, the new value is only stored after being

confirmed with the center or right button.

3.3. LED

A light-emitting diode is located on the left-hand side of the display. The colors have the

following meaning:

◼Green: Operation, no errors

◼Red: An error has occurred

◼Blue: Menu active

◼Yellow: Output testing mode

3.4. Reset and restoring factory settings

To restore factory settings, press the Reset button and hold it for at least 5 s; the factory

settings window will be displayed.

The options are:

◼Reset –YES/NO

◼Language selection

◼Cooling –YES/NO

◼Store/EXIT

Select “Reset”, switch to YES, and confirm by selecting “Store/EXIT”.

CAUTION! Restoring factory settings may lead to improper operation of the system

and in extreme cases, it may lead to a failure or damage to the system.

EUROSTER UNI4 –USER MANUAL 5

3.5. List screens

The controller settings are arranged hierarchically, according to the zone -> parameters order.

Only the basic settings are available for the user. Advanced options are included in “Settings”

and are protected with an access code.

3.6. Setting screens

Adjustable parameters with comments are listed below.

3.6.1. User settings

CH1 zone

◼The preset temperature of the zone

It is the zone temperature maintained with the use of the mixer. When operating with

the weather sensor, there are three settings (based on which the heating curve is

established). When operating without the weather sensor, one setting is available.

◼Schedule

With the use of schedule a zone may be switched off for the selected time on selected

days of the week.

CH2 zone

◼Parameters identical to the CH1 zone

DHW circuit

◼DHW temperature

It is the tank temperature to be maintained by the controller.

◼DHW schedule

With the use of schedule, we may preset time to feed the DHW tank on selected days of

the week.

DHW circulation circuit

◼schedule

With the use of schedule, we may preset the time of DHW circulation circuit operation

on selected days of the week.

Heating season

Switching to the “SUMMER” season results in switching off the CH 1 and CH 2 zones, DHW

circuits operate normally.

Switching to the “WINTER” season results in switching on the CH zones and DHW circuits.

Date and time

In this window, a user may enter the current date and time. Please remember that the

operation of the schedules, control algorithms, and events log is only correct with the correct

settings.

Output testing

Testing all outputs by switching them on and off. Provides the possibility to check the correct

operation of all devices connected to the controller. After 2 minutes the controller exits the

testing mode and switches to automatic operation.

Settings

Entering advanced settings (installer settings).

3.6.2. Technician’s settings

The technician’s settings are available after entering the access code. The default code is “1,

2, 3”.

CAUTION! It is recommended to restore factory settings before configuring a new

controller.

Settings for CH 1 zone (identical ones for CH 2 zone)

◼Switching the zone on/off

EUROSTER UNI4 –USER MANUAL 6

Switching off the unused zone.

◼Mixer

◼Mixer dynamics

Determines the time of mixer response to changes in the zone temperature. An

excessive value may cause frequent cycling of the mixer, whereas the insufficient

value may cause slowness in achieving the preset temperature.

◼Mixer hysteresis

If the measured temperature of a zone differs from the preset one by half of the

value of preset hysteresis, then the mixer position is not corrected.

◼Alarm temperature

CAUTION! Alarm temperatures for all zones should be selected carefully.

Incorrect setting of temperature level may cause improper operation or major

failure of the system components.

The alarm temperature should be preset as the maximum safe temperature for a

particular zone.

◼Room thermostat

In this item, a user may switch off the inputs of room thermostats. In such a case the

central heating will be switched on regardless of the requests of thermostats.

◼Weather compensator

Weather compensation provides a possibility to achieve thermal comfort regardless of

external temperature. The only requirement is to connect an outdoor temperature

sensor.

After switching the weather compensation on, temperatures of the CH zones for three

outdoor temperatures should be set. Based on those the controller calculates the

currently required zone temperatures every 10 minutes.

CAUTION! Temperatures must meet the condition of T10ºC ≤ T0ºC ≤ T-20ºC

otherwise, the control will not work properly.

◼Maintenance operation –if a given zone does not require heating (the schedule is

not selected or room thermostat contact is open) the controller will respond in the

following way:

◼stop –the pump will be switched off and the mixer closed,

◼time-based –the zone will be switched on for a preset time with the preset idle

time, the zone temperature will be decreased by the value of the "Reduction”

setting,

◼continuous –the pump does not switch off, the mixer reduces the zone

temperature by the value of the "Reduction” setting.

Settings for DHW circuit

◼Switching the circuit on/off

In this item, a user may switch off the DHW circuit if not used.

◼Hysteresis

It is a difference between the temperature at which the tank feeding pump is switched

off and on.

EUROSTER UNI4 –USER MANUAL 7

◼DHW allowance

The “DHW allowance” parameter determines the value by which the temperature of the

heating source must exceed the temperature of the tank. Setting a higher temperature

ensures adequate heating capacity and compensates for the heat loss due to the

imperfect insulation of pipes connecting the boiler to the tank.

If the temperature of the heating source is not sufficiently high, then the DHW tank

feeding pump is not switched on.

◼DHW priority

Switching on the DHW priority means that the controller switches off the CH zones for

the time when DHW is heated, this way the temperature preset for the tank is achieved

as fast as possible.

◼Priority operation time, priority break time

The time limit for the DHW priority operation prevents excessive cooling of rooms when

the tank may not be properly heated in a reasonable time.

To use this function, the priority break time must be set to a value other than zero.

The DHW tank is being heated for the period preset by the “Priority operation time”

parameter ( icon displayed), then the DHW priority is switched off for the “Priority

break time” ( icon flashing in the display). Subsequently, the DHW priority is

switched on again.

◼Disinfection

Switch on/off

This item enables a user to switch on periodic disinfection according to the schedule.

Schedule

Selecting adequate days results in switching on the disinfection at 0.00.

The proper cleansing consists in heating the DHW tank to the temperature of 70°C and

flushing the pipes with hot water.

The disinfection ( icon active in the display) may last for 2 hours maximum. If the

preset temperature of the tank is reached within 2 hours, the disinfection is successful.

If the tank fails to reach the temperature of 70°C in 2 hours, the disinfection is stopped

and the message informing of unsuccessful disinfection is displayed.

Activate

Activates disinfection manually on a one-off basis.

◼Alarm temperature

If the tank is fed by another, additional heating source and the tank temperature

exceeds the alarm temperature, then the controller switches on the DHW pump which

cools down the tank. It is indicated with an error of DHW overheating. The pump is

switched on only if the feeding temperature is lower than the preset alarm temperature

of the DHW tank.

CAUTION! When the alarm is activated please take special precautions to avoid

getting burned by the domestic hot water.

Settings for DHW circulation circuit

◼Switching the circuit on/off

This item enables a user to switch off the circulation circuit when not used.

◼Circulation operating time setting range from 1 to 99 minutes

◼Circulation idle time setting range from 1 to 99 minutes

Feeding no. 1

◼S1 sensor on/off

Switching the feeding temperature sensor (main heating source) on or off.

If the sensor is off, then the CH 1, CH 2 zones, and DHW circuit operate according to

their operating algorithms and disregard the feeding temperature.

If the S1 sensor is on, the following parameters are available.

EUROSTER UNI4 –USER MANUAL 8

◼Boiler relay output (feeding no. 1) determines the way of boiler relay operation:

◼AUTO –the temperature preset for the feeding temperature sensor will be

established automatically depending on the demand for heat in individual zones.

The preset temperature will be determined based on the formula: the highest

temperature of the CH 1, CH 2 zone, DHW circuit + the “Allowance” parameter

◼TEMP –maintains constant preset temperature on the S1 feeding sensor

When the temperature on the feeding sensor drops by the value of the hysteresis,

then the boiler relay is switched on.

◼Schedule

Hourly schedule of boiler operation. Provides the possibility to select the time of heating

source operation. The function is handy if, e.g. the electric heating operates in the 2nd

charging rate.

◼Feeding temperature (the parameter is available with the following settings: Boiler

relay output –TEMP) –S1 sensor temperature setting, above which the boiler relay

output will be switched off.

◼Hysteresis –the parameter determining the number of degrees by which the feeding

temperature must drop below the preset temperature (or calculated in AUTO mode),

for the boiler relay to be activated.

◼Alarm temperature

When the feeding alarm temperature is exceeded, the alarm algorithm is activated in

an attempt to cool down the boiler.

CAUTION! The alarm algorithm heats zones to temperatures approximate to

alarm temperatures. It is important to ensure a safe level of alarm

temperature for each zone.

◼Pump starting temperature

Above this temperature, the pumps of CH 1, CH 2 zones, and DHW circuit are activated.

◼Allowance (the parameter is available with the following settings: Boiler relay output –

AUTO)

The parameter determines by how much the feeding temperature must exceed the

temperature calculated by the controller for zones.

Feeding no. 2

◼S2 sensor on/off

Provides the possibility to switch on the support of buffer pump –the additional heating

source.

◼Switch-on temp.

Exceeding the switch-on temperature results in switching on the buffer pump and

switching off the feeding relay (boiler relay output). and

◼Hysteresis –the parameter determining by how many degrees must the S2 sensor

temperature drop below the switch-on temperature, so that the buffer pump relay is

switched on.

◼Feeding alarm temperature

When the feeding alarm temperature is exceeded, the alarm algorithm is activated in

an attempt to cool down the boiler.

◼Buffer on/off

When buffer operation is active, two preset temperatures for buffer heating are

available:

◼Top temperature (S1 sensor) –it is a preset temperature, up to which the top

part of the buffer will be heated

◼Bottom temperature (S3 sensor) –it is a preset temperature, up to which the

bottom part of the buffer will be heated

The buffer is heated by the buffer pump. The temperature at the S2 sensor must

exceed the temperature of the buffer by 3°C so that the buffer pump is switched on.

The preset top and bottom temperatures are not displayed.

EUROSTER UNI4 –USER MANUAL 9

Correction of sensors

Correction of temperature sensors allows to correct temperature reading errors, such as the

ones resulting from improper contact between the sensor and the pipe.

Automatic operation

The function enabling automatic switch-off of the CH 1 and CH 2 zones if the temperature of

the S7 sensor (outdoor sensor) exceeds the preset value of the "Switch-off temperature".

The heating will be restarted if the external temperature drops below the preset value of

"Switch-on temperature".

The automatic operation mode is available when the outdoor temperature sensor is connected

and WINTER season selected.

Events

The device records hazardous events. The display shows subsequently: Event number (since

the installation), date, time, and comments, e.g.: 11. 19-09 14:16:38 DHW overheating

4. INSTALLATION

4.1. Connection

◼Prior to the commencement of any installation works read this manual carefully!

Incorrect installation and handling of the controller result in loss of manufacturer's

warranty.

◼Prior to mounting or dismantling the controller make sure that it is de-energized.

Connection and disconnection of temperature sensors should also be performed when

the device is de-energized.

◼Voltages hazardous to life are present on the controller and its connections, therefore

only qualified and authorized technicians may be entrusted with the installation of the

controller.

◼Install the controller in the circuit with proper electrical protections, in accordance with

current regulations.

◼The performed electric connections and cables used shall be adequate to the applied

loads and must conform to all requirements.

◼Do not install the controller in rooms of increased humidity, protect it against water and

other liquids.

◼The controller is designed to be mounted on a 35 mm DIN rail in a protective cabinet.

◼Do not install any controller showing signs of mechanical damage.

◼The controller is not a safety component. Additional protection devices must be used in

systems prone to the risk of damage due to the failure of control systems.

CAUTION! Euroster Uni4 controller and a heat emitting device are connected to the

“BOILER RELAY” output and must be powered from the same phase of the power

system.

CAUTION! When connecting power cables, pay particular attention to the correct

connection of PE conductors.

The temperature sensors are not suitable to be immersed in liquids.

The controller interacts only with actuators equipped with limit switches.

The controller must be installed in a place where ambient temperature does not exceed 40°C.

All necessary cables must be laid prior to mounting the device.

Screw the electric cables to the connection blocks according to the description and drawing.

Make sure to keep the proper designation of the cables. Screw the neutral conductors to N

terminals, phase conductors to L terminals, and grounding conductors to PE terminals. Connect

the device using a cable with a minimum diameter of 0.75mm².

The controller is equipped with seven temperature sensors. It is not necessary to connect

sensors for the switched-off zones/functions.

The controller sensors may be connected in any way, with no need to keep cable polarity. At

installation avoid leading the sensors parallel to live cables. Moreover, make sure to provide

the proper contact with measured surfaces.

The outdoor temperature sensor should be installed in a shaded place, away from windows and

doors, at a height of approximately 2 m above ground.

EUROSTER UNI4 –USER MANUAL 10

A room thermostat control may be switched on or off for each central heating zone. It is only

allowed to use thermostats with a voltage-free normally open (NO) contact. It is

recommended to use Euroster devices.

The connection diagram is shown below.

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