Crono.X - Thermostat Vemer - Free user manual and instructions

Product Type	Electronic programmable thermostat
Model	Crono.X
Brand	Vemer
Power Supply	2 x 1.5V AA alkaline batteries
Battery Autonomy	Approx. 2 years (2500 mAh at 23°C)
Output Relay	Bistable relay, changeover contact 8A/250V~ (resistive)
Temperature Control Range	Heating: +2°C to +35°C; Air conditioning: +10°C to +35°C
Accuracy	±0.5°C
Display	LCD showing day, time, temperature, operation mode icons
Operation Modes	Automatic, Manual, Timer-controlled, Off
Programmable Profiles	7 preset daily profiles, user-customizable for each day
Temperature Levels	T0, T1, T2 (assignable per hour segment)
Settings Guard (Password)	Enabled via password (000-999) to prevent unauthorized changes
Automatic Daylight Saving Time	Enabled (last Sunday March/October) or user-configurable
External Sensor Option	X.TEMP (VN883500), max distance 40m, range -40°C to +60°C
Remote Control	Via phone dialer X.CODE BUS/Wave or general-purpose with clean contact
Differential (ON/OFF control)	Adjustable 0.1°C to 1.0°C
Proportional Control (Heating)	Band 0.5°C to 5.0°C; period 10, 20, or 30 min
Antifreeze Temperature	1°C to 10°C or disabled (when in Off mode)
Dimensions (W x H x D)	123.0 x 93.5 x 33.5 mm
Installation	Wall or 503 box (mounting at 150 cm recommended)
Protection Rating	IPXXD
Insulation Class	II
Operating Environment	0°C to +50°C, 20% to 90% RH non-condensing
Storage Temperature	-10°C to +65°C
Battery Replacement	Use alkaline AA only; replace within 1 minute to preserve settings
Safety Standards	Complies with EU Directives 2006/95/EEC, 89/336/EEC; harmonized standards EN 60730-2-7, EN 60730-2-9

Frequently Asked Questions - Crono.X Vemer

How do I set the current time and date?

Press the SET TIME/DATE key (). The seconds flash. Press √ to advance to minutes, use ↓/↑ to adjust, then press √ repeatedly to cycle through hours, year, month, and day. Press to exit or wait 45 seconds for auto-save.

How can I select a different weekly program?

In Automatic mode, press the PKG key. The display shows 'Pro P1'. Use ↓/↑ to choose from 7 preset programs (P1-P7) for each day of the week. Press √ to confirm each day. After Sunday, the device resumes normal operation.

What should I do if the battery indicator flashes?

A flashing display indicates low batteries. Replace both alkaline 1.5V AA batteries within 1 minute to avoid losing time/date settings. After replacement, all other settings remain stored.

How can I enable the settings guard to prevent tampering?

Hold down keys T and P simultaneously for a few seconds until 'BLOC' appears. To disable, repeat the same key combination. The default password is 123, changeable in Advanced Programming (parameter 'PAS').

Can I connect an external temperature sensor?

Yes, connect the optional X.TEMP sensor (VN883500) to the EXT NTC terminals (max 40m with shielded cable). In Advanced Programming, set parameter 'EST' to 'YES' and optionally select the control sensor ('SnS') to 'EST' for external temperature control.

How do I change the temperature control method from ON/OFF to Proportional?

Enter Advanced Programming by holding down the PRO key for 3 seconds until 'rEG' appears. Use ↓/↑ to select 'P' for Proportional (Heating only) or '0' for ON/OFF. Press √ to confirm. Then adjust band (bnd) and period (PEr) as needed.

What does the '---' error message on the display mean?

The '---' indicates a sensor fault (internal or external). In Heating mode, the relay will activate for 10 minutes every 4 hours to prevent freezing. In Air Conditioning mode, the relay stays off. Check sensor connections or replace if necessary.

How do I use the timer-controlled operation?

Press the TIMER key (⏱). The display shows '00 h' (hours) or '00 d' (days). Use ↓/↑ to set the duration (max 99). Press √ to start. The timer icon stays lit until expiry, then the device reverts to the previous mode.

Can I temporarily override the automatic schedule?

Press the MANUAL key (☐). The display shows 'SET' and a flashing temperature. Adjust with ↓/↑ and press √ or wait 45 seconds. To return to Automatic, press the same key for 3 seconds until the manual icon disappears.

How do I connect a phone dialer for remote control?

Connect the dialer (X.CODE WAVE for landline or X.CODE BUS for GSM) to the OUT BUS terminals. In Advanced Programming, set 'bUS' to 'YES' for RS485 (X.CODE BUS) or 'NO' for relay contact. Then follow dialer instructions for remote on/off.

USER MANUAL Crono.X Vemer

Diagram showing two mechanical or electrical component states with directional arrows indicating motion (no text or symbols)

APERTURA SPORTELLINO FRONTALE

Line drawing of a portable electronic device with control panel and indicator lights (no text or symbols)

DIMENSIONI
(mm)

MESSAGGI DI ERRORE

■ Adjustment of time and date pag. 41

■ Automatic operation pag. 42

- Program selection pag. 42

- Program customizing pag. 43

- Winter temperature profi les pag. 45

- Summer temperature profi les pag. 46

■ Manual operation

- Manual operation selection pag. 47

- Setting the manual temperature pag. 47

■ Device off mode

■ Winter-heating/summer-air conditioning modes

■ Timer-controlled operation

- Timer-controlled off type pag. 49

- Timer-controlled manual type pag. 49

- Timer-controlled automatic type pag. 49

■ Control by telephone dialler

- Configuration for X.CODE BUS pag. 51

- Configuration for X.CODE Wave and general-purpose phone dialer pag. 51

■ Other available functions

- Maximum and minimum daily temperature pag. 54

- On/off or proportional temperature-control method pag. 56

- Aantifreeze temperature pag. 58

- Unit of measurementage pag. 58

- External sensor pag. 59

The CRONO.X thermostat performs 1B-type actions and is aimed for household or similar premises, under a normal pollution degree.

During product installation and operation, it is necessary to observe the following instructions:

1) The instrument must be installed by a qualified person
2) Disconnect power supply while installing the unit
3) Do not power or connect the product if any part of it is damaged
4) Connect the product considering the diagrams described in the following manual and on the instrument

User Manual

ELECTRONIC PROGRAMMABLE THERMOSTAT CRONO.X

Read all the instructions carefully

■ CRONO.X is a weekly programmable thermostat that unites ease of use with some innovational functions not featured by traditional household temperature controllers.

More specifi cally, this device is singled out by 6 features:

1) It displays or controls the temperature in a room situated at a maximum distance of 40m by the use of an optional sensor (mod. X.Temp cod. VN883500)
2) A settings guard function is available in order to avoid unauthorized tampering when the device is used in public premises.

3) The system's on-off status can be remote-switched by landline or cellular GSM phone. This is especially useful when the house is not used permanently or it is a holiday home.

To implement this function it is necessary to install a device that receives calls or SMSs and interfaces with the programmable thermostat (phone dialer mod. VN782900 X.Code Wave for landline phone, VE072500 X.Code Bus for GSM network)

4) Daylight saving time/solar time switching can be automatically enabled or disabled

5) The cut-in differential can be adjusted from 0,1°C to 1,0°C

6) Temperature control can be set to ON/OFF mode or Proportional mode with selectable band and periods, the latter being especially appropriate in very large rooms with a strong thermal drift (sheds, systems including fan-coils, aluminum or cast-iron radiators, etc.)

Also, when in manual mode, CRONO.X works as an ordinary thermostat.

Conversely, when in automatic mode: one of the three user-defined temperature levels can be chosen for each hour segment of the day.

CRONO.X controls both heating and air-conditioning systems.

TECHNICAL SPECIFICATIONS

Code

Model

Description

Power

supply

VE081600 CRONO.X electronic programmable thermostat 2x1,5V (AA) batteries

• 4 available operation modes: Automatic, Manual, timer-controlled, off
• when in automatic mode, 7 temperature profi les can be selected and changed by the user
• when in automatic mode, the user can assign one of three temperature levels (T1, T2, T3) to each hour segment
• The device is suitable for the control of heating and air-conditioning systems
  • Automatic solar/daylight saving time switching (can be disabled)
• Settings guard function for use in public premises (tampering protection)
• Optional external sensor (X.TEMP code VN883500) for temperature control or reading (max 40 m; -40°C ÷ +60°C)
• Remote control using a dedicated phone dialer by Vemer (X.CODE WAVE and X.CODE BUS) or by general-purpose phone dialer with a potential-free output contact
  • Maximum and minimum daily temperature reading
• Antifreeze temperature to be selected from 1^ to 10^ (can be disabled)
  • Power supply: 2 alkaline batteries 1,5V (AA-size)
• Battery autonomy: approximately 2 years (for alkaline batteries 2500mAh at 23^ )
• Standby charge for battery replacement: approximately 1 minute
• Output: bistable relay with changeover contact 8A/250Vca (resistive load) 2000VA (resistive load)

- Termination:

- relay output: 3-pole terminal strip, max. section of cables 1.5 mm ^4

- external sensor input and telephone dialer: 4-pole terminal strip, max. section of cables 1.5 mm ^2

- Installation:

-on wall

- to cover a 503 box

• Temperature-control range:

- HEATING mode Automatic/Manual operation: +2°C ÷ +35°C

- AIR-CONDITIONING mode Automatic/Manual operation: +10°C ÷ +35°C

- ON/OFF control cut-in differential: adjustable from 0,1°C to 1,0°C

- Proportional control with adjustable band and period

- Accuracy: ± 0.5^

• Operating conditions:
• temperature 0^ C ÷ +50°C
• relative humidity 20% ÷ 90%, non-condensing
  • Storage temperature: -10^ ÷ +65^
  • Protection rating: IPXXD
  • Insulation class: II

INSTALLATION AND ASSEMBLY

It is advisable to install the programmable thermostat in a zone in which the temperature is the closest to the room average value.

Do not install it too near doors, windows, sources of heat, direct sunlight or in places in which there is too much or too little air flow.

Installing the programmable thermostat about 150 cm from the floor is recommended.

Mounting can be on a wall or on a 503 box.

PLACEMENT REMOVAL

Diagram showing two mechanical or electrical component states with directional arrows indicating rotation or movement (no text or symbols present)

FRONT FLAP OPENING

Line drawing of a rectangular electronic device with control panel and indicator lights (no text or symbols)

DIMENSIONS

(mm)

DEVICE DESCRIPTION

FRONT VIEW

FUNCTIONS OF KEYS

Value up

Value down

Manual operation

WINTER-HEATING mode

SUMMER-AIR CONDITIONING mode (only accessible using a sharp tool)

Reset (only accessible using a sharp tool)

To set T0 for Automatic operation

To set T1 for Automatic operation

To set T2 for Automatic operation

System off

Timer-controlled operation

Hourly programming for automatic operation; hold it down for 3 sec. to enter advanced programming

To set the time and date; hold it down for 3 secs. to enable or change the solar/daylight saving time

To confirm the settings

DISPLAY

INITIAL STARTUP - TOTAL RESET

This procedure enables correct operation of the CRONO.X on first startup, or resets factory settings (Default settings).

Revert to factory settings - TOTAL RESET

• Place 2 alkaline batteries 1.5V – AA size, with correct polarity
• Press R: all the segments will appear on the display
• Press √ within 3 secs: the reading “DEF” will appear After a few seconds the reading “12:00” will flash on the display.
• Press Ⓗ: the minutes will flash
• Press Ⓗ: all the segments will be continuously lit, the hour, minutes and the temperature measured will appear as well as a set of small squares indicating daily programming

CRONO.X will operate in automatic mode (cfr. page 42).

- Set the time (cfr. page 41)

Default settings are:

Operation WINTER-HEATING

Mode AUTOMATIC

Hourly schedule MON-FRI PRG1; SAT-SUN PRG2

Temperature T0 5.0°C

Temperature T1 15.0°C

Temperature T2 18.0°C

Antifreeze temperature 6.0°C
Temperature control method	ON/OFF
Cut-in differential 0.3°C
Automatic solar/daylight time switching	YESWinter → Summer: last Sunday in March at 2:00 AMSummer → Winter: last Sunday in October at 3:00 AM
External sensor NO
Date 01-May-2005

ADJUSTMENT OF TIME AND DATE

To set time and date

• Press 📂: the seconds will flash
• Press √: the minutes will flash
  • To enter the minutes press for
• Press √: the hours will flash
• To enter the hours press ↓ or ↑
• Press √: the year will flash
  • To enter the current year, press for
• Press √: the month will flash
  • To enter the current month, press ↓ or ↑
• Press √: the day will flash
  • To enter the present day, press ↓ or ↑
• Press √: the seconds will flash again

- Press 📄: the device will resume normal operation

Note

If no key is pressed for 45 seconds when in the time and date programming procedure, the programmable thermostat will store the changes effected and will resume normal operation.

AUTOMATIC OPERATION

When in automatic mode it is possible to assign one of the three available temperatures to each of the 24 hour segments: T0, T1 or T2.

This enables the user to find his/her home comfortably heated in the hour segments of his/her preference; when the user is not in or at night, the device will see to keeping a lower room temperature.

Seven preset daily temperature profiles (Programs) are available for both WINTER-HEATING and SUMMER-AIR CONDITIONING operating modes.

Each of these profi les can be customized following specifi c user requirements.

The display will show the temperature associated to the 24 hours as follows:

• 2 “small squares” on top of each other: to adjust the temperature starting from the set value by pressing key T (temperature T2)
• 1 “small square”: to adjust the temperature from the set-point, by pressing key ☑ (temperature T1)
• no “small square”: to adjust the temperature from the set-point, by pressing key T8 (temperature T0)

Factory settings (Default) feature the temperature profi le corresponding to Program 1 for Monday through Friday; Program 2 for Saturday and Sunday (refer to the profi les on page 45).

PROGRAM SELECTION

This procedure changes operating hours and temperature profiles, choosing among the seven available preset programs, and assigning these to each of the days in the week.

1. Press PKG: the following reading will appear

1. Press ↩ or ↗ to select the hourly schedule to be assigned to Monday (cfr. page 45 for Winter-Heating, or page 46 for Summer-Air conditioning)

2. Press √ to confirm; the day of the week will change

3. Repeat steps 2 and 3 to select the hourly schedule to be assigned to the remaining days of the week

4. After the Sunday schedule is confirmed the device exits programming and resumes normal operation

PROGRAM CUSTOMIZING

This procedure changes the temperature profile (hourly schedule) to suit special requirements, assigning the desired temperature to each of the 24 hour segments.

Every hour of the day can be associated 1 of the three available temperatures (T0, T1, T2).

When in SUMMER-AIR CONDITIONING MODE, temperature T0 equals system OFF. A temperature change delay of 15, 30 or 45 minutes can be set for every hour.

Both WINTER-HEATING programs and SUMMER-AIR CONDITIONING programs can be customized independently.

For example, program P1 for WINTER-HEATING, can feature totally different hours and temperatures from the P1 program for SUMMER-AIR CONDITIONING.

1. Press PRG: the following reading will appear

1. Press for to select the hourly program that best meets the specific requirements
2. Press PRO: the current time will appear (minutes will be zeroed) and the associated "small squares" will flash;
3. Press ↓ or ↑ to move to the hour segment whose assigned temperature needs to be modified
4. If you wish to delay the temperature change by 15, 30 or 45 minutes, press the key below once, twice or three times 📋
5. Press T or Tt. select the temperature to be assigned to the hour segment

Temperature T0: no small square

TC Temperature T1: 1 small square

Temperature T2: 2 small squares on top of each other

1. Repeat the steps from 4 to 6 for all the hour segments whose associated temperature needs to be changed
2. Press PRO to store the changes and make the customized hourly program available.
3. If you wish to alter another program, repeat the steps from 2 to 8.
4. Press or to select the hourly schedule to be assigned to Monday (cfr. page 45 for Winter-Heating, or page 46 for Summer-Air conditioning)
5. Press √ confirm; the day of the week will change
6. Repeat steps 10 and 11 to select the hourly schedule to be assigned to the remaining days of the week
7. After the Sunday schedule is confirmed the device exits the programming and resumes normal operation

T0, T1 AND T2 temperatures correspond to the values that will be kept when in automatic operation mode, following the selected schedule and program (temperature profile).

- Press to set temperature T0 (no “small square”) for WINTER-HEATING mode min = +2.0°C; max = T1 for SUMMER-AIR CONDITIONING mode system off (the display will read “---”)

- Press to set temperature T1 (one “small square”) for WINTER-HEATING mode min = T0; max = T2 for SUMMER-AIR CONDITIONING mode min = +10°C; max = T2

- Press to set temperature T2 (two “small squares”) for WINTER-HEATING mode min = T1; max = +35.0°C for SUMMER-AIR CONDITIONING mode min = T1; max = +35.0°C

- Press to confirm or else wait for 45 seconds

DEFAULT TEMPERATURE PROFILES (PROGRAMS): WINTER-HEATING MODE

P1

Note: Program 7 keeps temperature T0 all day long; no “small square” will be shown on the display

DEFAULT TEMPERATURE PROFILES (PROGRAMS): SUMMER-AIR CONDITIONING MODE

P1

P2

P3

P4

P5

P6

P7

T2
T1
	0	1		2	3	4		5	6		7	8	9		1	0	1	1	1	2	1	3	1	4	1	5	1	6	1	7	1	8

Note: Program 7 keeps temperature T0 all day long and the system is permanently off; no “small square” will be shown on the display

Manual operation is enforced when one wishes to temporarily discontinue Automatic operation and set a different temperature.

Then the temperature will not be governed by the program schedule, but by the manually selected temperature: In this case CRONO.X will behave as an ordinary thermostat.

This status is indicated by the symbol 📋 on the display.

1) Press: the reading

will appear, in which the temperature to be set fl ashes (time, day and temperature may differ from the example)

2) Press for to set the desired temperature
3) Press √ confirm or wait for 45 seconds; the display will then read the time, the temperature measured and the icon ☐; the reading "SET" will disappear

SETTING THE MANUAL TEMPERATURE

1) Press ↓ or ↑: the reading "SET" will appear up on the right and the temperature previously set in manual mode will flash
2) Press for to set the desired temperature
3) Press √ to confirm or else wait for 45 seconds: the display will read the temperature measured again

To exit the manual operation mode

Press 📄 for 3 seconds: the device will resume automatic operation mode and the icon 📄 will disappear

DEVICE OFF

When in this status the programmable thermostat is completely disabled or else it keeps the antifreeze temperature (which can be altered by the user).

The antifreeze temperature is determined by the parameter “OFF” in Advanced Programming (cfr. pages 56 and 58).

The Antifreeze default temperature is 6^ C but can be set from 1^ C to 10^ C. To shut down the system set “---”

When in OFF status, the time, day of the week and the temperature will still be read.

To select the off operation status

Press Ⓐ: only the time, day and temperature will be displayed.

To exit the off operation status

Press ☐: the device will resume the previous operation mode (Manual or Automatic).

WINTER-HEATING /SUMMER-AIR CONDITIONING OPERATION MODES

CRONO.X controls both Heating and Air-conditioning systems.

Depending on the selection, the device's control mode is indicated by the flame icon for WINTER – HEATING or by the snowflake icon for SUMMER – AIR-CONDITIONING.

The factory setting is WINTER-HEATING.

To select winter-heating or summer-air conditioning:

1) Press using a sharp tool, the display will read

(WINTER-HEATING operation)

2) Press for to select SUMMER-AIR CONDITIONING

3) Press √ confirm or else wait for 45 seconds

This very useful function makes it possible to temporarily change, for a user-definable term, the normal functioning of the programmable thermostat.

The timing can be selected in hours (max 99) or days (max 99) and is indicated by the symbol 📄

There are three types of timer-controlled operation:

TIMER-CONTROLLED OFF TYPE

The starting operating mode is OFF and it is kept for a determined term (hours or days), after which the device resumes the previous operating mode (Manual or Automatic).

This type of timer-controlled operation can be used during vacations, so that automatic mode is discontinued.

TIMER-CONTROLLED MANUAL TYPE

The Starting operating mode is MANUAL and it is kept for a determined term (hours or days), after which the device resumes Automatic operation.

This type of timer-controlled operation can be used to keep for a few hours (or days) a temperature different from the Automatic set-point.

For example, this can be selected on a very chilly winter evening, to raise the temperature for a couple of hours using the manual operation mode. Then the user will not need to remember to set the CRONO.X back to automatic before going to bed.

TIMER-CONTROLLED AUTOMATIC TYPE

The Starting operating mode is AUTOMATIC and it is kept for a determined term (hours and days), after which the device switches back to the OFF mode.

This is used to switch the CRONO.X off for a certain time or a day when nobody is going to be in.

If the timing is in hours, the timer trips when the hour expires; if it is in days, the timer trips at midnight.

If during a timing term the operation mode is switched – for example from timer-controlled manual to automatic or off, the timing is called off.

The timer count includes the hour in which the programming occurs; similarly, if the timing is in days, the count also includes the current day.

E.g.: if the timer is set at 13:52 and it is set for 1 hour, it will trip when the hour elapses, i.e. at 14:00.

If the clock is adjusted when the timer is set, the latter will not be updated.

To select timer-controlled operation

1) Press the display will read

and “00” will flash

2) To set the timer in hours, pres: the reading

will appear, with "00" flashing

3) To set the timer (in hours or days), press ↓ or ↑
4) Press √ to confirm or wait for 45 seconds; the icon will stay lit on the display until the timing expires

CONTROL BY TELEPHONE DIALLER

The CRONO.X programmable thermostat can be remote-controlled through a telephone.

This feature is especially useful to control the heating in second homes, as this makes it possible to prepare a warm environment.

To implement this function it is necessary to connect up a device or dialer that receives calls or SMSs and interfaces with the programmable thermostat.

Phone dialers are available for landline phones (VN782900 X.Code Wave) or for GSM cellular phones (VE072500 X.Code Bus).

• Using the X.CODE BUS and RS485 serial communication protocol it is possible to change the CRONO.X operation mode (Manual, Automatic or OFF), change the temperature set-point, and receive on a cell phone a message summarizing the settings and the temperature measured in the premises.
• The use of the X.CODE WAVE or X.CODE BUS with the output relay clean contact, makes it possible to switch the operation mode of the CRONO.X from Manual or Automatic to Off and the other way round.

Dialer clean contact OPEN → Operating mode AUTOMATIC or MANUAL Dialer clean contact CLOSED → Operating mode OFF (Antifreeze temperature where enabled)

In this case it is not possible to receive the measured temperature reading.

CONFIGURATION FOR X.CODE BUS (code VE072500) WITH RS485

After connecting the two terminals OUT BUS in the CRONO.X up to those marked BUS on the X.CODE BUS, respecting polarity.

• Go to Advanced Programming (cfr. pages 57-59) and set the “6U5” parameter to Yes
• Confir rm by
• The “Rdr” – memory address – will appear
• Hold down the ON/OFF key in the X.CODE BUS for at least 5 seconds: the ON/OFF led will flash
• Wait for approximately 10-20 seconds: as soon as the ON/OFF led stops blinking: the phone dialer will be configured
• Press √ on the CRONO.X to confirm all the remaining Advanced Programming parameters, or else allow 45 seconds to return to normal operation

As for how to send SMS messages to switch the device on or off, refer to the instructions for the X.CODE BUS.

CONFIGURATION FOR X.CODE WAVE (code VN782900), X.CODE BUS (code VE072500) and for PHONE DIALERS WITH CLEAN OUTPUT CONTACT

After connectig the 2 OUT BUS terminals in the CRONO.X up to those marked as relay output contacts in the X.CODE WAVE, X.CODE BUS or other dialer for landline phone or GSM cell phone with a clean output contact.

• Go to Advanced Programming (cfr. pages 57-59) and set the "6U5" parameter to n0
• Confirm by

- Press √ confirm all the remaining Advanced Programming parameters, or else allow 45 seconds and return to normal operation

As for how to send the commands switching the device on or off, refer to the instructions for the X.CODE WAVE, X.CODE BUS or relevant phone dialer.

OTHER AVAILABLE FUNCTIONS

SETTINGS GUARD (PASSWORD)

When enabled, this function inhibits keyboard operation.

Changing any parameter is only allowed after a special configuration area has been accessed and the correct password has been entered (number from 000 to 999).

The password is selected in parameter “PAS” of the Advanced Programming area (cfr. pages 57 and 59).

The default password is 123.

To enable the settings guard

- From the Automatic, Manual or OFF operating modes: hold down the keys TP and T are ananeously for a few seconds; the display will read

and will resume the previous operation mode (Automatic, Manual or off)

To disable the settings guard

• Hold down the keys T* T* naneously for a few seconds
• To select the password (parameter "PAS" – Advanced Programming), press or
• Press to confirm

AUTOMATIC SOLAR/DAYLIGHT TIME SWITCHING

CRONO.X changes the time from daylight saving to solar on the last Sunday in March at 02:00; from solar to daylight saving on the last Sunday in October at 03:00.

This function too can be disabled, or else the date and hour in which the time switch occurs can be changed.

To alter the solar-daylight saving time switch

Hold down for approximately 3 seconds: the following reading will appear

(If the reading is "CHANGE OFF" press ↓ or ↑ to switch it to "On")

• Daylight saving time solar time switching

1) Press √ to confirm: the following reading will appear

2) Press PRO to change the settings: "L5E" will flash
3) Press or to select the week of the month in which the Daylight saving → Solar time switch is to take place (“1ST” for first, “2ND” for second, “3RD” for third, “4TH” for fourth, “LST” for last)
4) Press √ to confi rm: the Sunday segment will fl ash
5) Press ↓ or ↑ to select a day of the week
6) Press √ to confirm: "03" will flash
7) Press ↓ or ↑ no select a month
8) Press √ to confi rm: "02:00" will fl ash
9) Press ↓ or ↑ to select the time
10) Press √ to confirm: All segments will be continuously lit

• Solar time→ daylight saving time switching

Press √: the following reading will appear

Follow the instructions from step 2) to 9)

Press √ to confirm and exit the settings

MAXIMUM AND MINIMUM DAILY TEMPERATURE

CRONO.X stores the external and internal minimum and maximum values measured over the day (external temperature only if an external sensor is provided).

- To view these values just press (for the minimum temperature) or (for the maximum temperature)

This function is available when in Automatic and off mode, but not when in manual mode.

- To set the minimum or maximum readings to zero, just hold down ▼ or ↑ for at least 3 seconds until the display reads “---”

The maximum value will be identified as “H I”, the minimum as “L0”.

LOW BATTERY LEVEL INDICATOR

When the batteries are about to be dead the display will start to flash.

When in this condition, relay changeover is not guaranteed: it is therefore advisable to replace the batteries (cfr. page 60 “BATTERY REPLACEMENT”).

ADVANCED PROGRAMMING

Advanced programming makes it possible to change some parameters and view some system data.

The user-selectable parameters are:

PARAMETER READING	DEFAULT PAR	AMETER RANGE	GE NOTES
Temperature control method	rEG 0		Q = ON/OFF P = PROPORTIONAL
Control band(ONLY when rEG=P and WINTER-HEATING operating mode)	bnd	00.5 °C 00.5°C ÷ 05.0°C
Control period(ONLY when rEG=P and WINTER-HEATING operating mode)	PER	10 minutes 10 - 20 - 30 minutes
Differential(ONLY when rEG=O)	d IF	00.3 °C 00.1°C ÷ 01.0 °C
Antifreeze temperature(only when in WINTER-HEATING mode)	OFF	06.0 °C	01.0 °C ÷ 10.0 °C“---” = disabled	The temperature is kept pressing the OFF key
Unit of measurement	dEG	C	C=CelsiusF=Fahrenheit
External sensor	EST n0		n0 = not providedYES = external sensor is connected	External probeX.TEMPcode VN883500(optional)
Control sensorONLY when ESt=YES)	SnS Int		Int = internalEST = external
RS485 output enabled(Out Bus)	bus	YES	YES = enabledn0 = disabled	Phone-control output
Memory address(ONLY when bUS=YES)	Adr			Upon initial start-up procedure, default parameters are enforced an a new address is generated
Settings guard password	PAS	123 000 + 999		For use in public premises
Total number of hours of output operation	tot	000 000 + 65535 (7 years)		Total number of hours when output relay in ON status
Battery charge status	bAt		100% ÷ 0%	The initial value depends on the battery charge
Display brightness adjustment	Cnt	80 ÷ 15

To enter advanced programming and change the parameters

1) Hold down for 3 secs until the display reads "rEO"
2) Press for to select the desired value
3) Press √ to confi rm
4) Repeat steps from 2) to 3) to change the remaining Advanced Programming parameters
5) After confirming the parameter “[n]” the device resumes the previous operating status (Automatic, Manual or System Off)

Description of advanced programming parameters

TEMPERATURE-CONTROL METHOD (rEO)

The choice of the temperature-control method depends on the features of the system it is applied to.

In most cases ON/OFF temperature-control is recommended (which is the default choice), but Proportional temperature control is preferable in premises with a high thermal drift (large rooms, fan-coil systems, cast-iron radiators, etc)

The Proportional method can only be selected for the WINTER-HEATING mode.

- On/off temperature control (☐)

It is the common control method with most thermostats and programmable thermostats.

This methods ensures accurate temperature control in nearly all systems.

When in the ON/OFF control method, CRONO.X's behavior depends on a user-definable parameter: The cut-in differential (dIF), also called hysteresis.

- Winter-heating

The system connected to the output of the programmable thermostat will be switched on when the temperature drops below the set-point by a value equaling the cut-in differential (dIF); the system is switched off when the temperature set-point is exceeded.

E.g.: Tset = 20.0°C; dIF = 00.3°C (Tset = Manual or Automatic temperature set-point).

When the temperature drops below 19.7^ C (Tset-dIF), the system switches on and stays on until the temperature exceeds 20.0^ C (Tset).

- Summer-air conditioning

The system connected to the output of the programmable thermostat will be switched on when the temperature exceeds the set-point by a value equaling the cut-in differential (dIF); the system is switched off when the temperature drops below the set-point.

E.g.: Tset = 20.0°C; dIF = 00.3°C (Tset = Manual or Automatic temperature set-point).

When the temperature exceeds 20.3^ C (Tset+dIF), the system switches on and stays on until the temperature drops below 20.0^ C (Tset).

• Proportional temperature control (P)

This temperature-control method improves performance with some particular systems, and helps keep a constant temperature in the premises.

It ONLY applies to WINTER-HEATING operation, whether in Automatic or Manual mode.

It is defined by two parameters:

• Control band (bnd; 0.5^ C ÷ 5.0^ C)
• Control period (Per; 10 min – 20 min – 30 min)

In the interval defined by the Control Period (Per), 10 - 20 - 30 minutes, the output will switch to ON for a time span that is proportional to the difference between the set-point and the temperature measured.

At the end of every Control Period, CRONO.X reads the temperature measured and compares it with the set-point: based on the difference between the 2 values, it then keeps the output ON for a proportional time accordingly.

When the temperature measured is close to the set-point, the output will stay ON for a short time calculated on the total Control Period (Per) (e.g. 2 min for Per = 20 min).

When the temperature measured is far from the set-point, the output will stay ON for nearly all the Control Period (e.g. 19 min for Per = 20 min).

If the temperature measured is lower than the set-point and the difference is greater than the Control band value (bnd), then the output will stay ON for the entire Control Period.

If the temperature measured is higher than the set-point and the difference is greater than the Control band value (bnd), then the output will stay OFF for the entire Control Period.

Notes on the selection of proportional control parameters

Optimized Proportional Control depends on a correct choice of parameters.

Control Period Selection (PEr):

10 min for low thermal-drift systems (fan-coil type)

20 min for medium thermal-drift systems (e.g. aluminum radiators)

30 min for high thermal-drift systems (e.g. cast-iron radiators)

Control Band Selection (bnd):

wide band (5°C) for systems with a high thermal gradient narrow band (0.5°C) for systems with a low thermal gradient

EXAMPLES

fan-coil system bnd = 3.0°C PEr = 10 min radiator system → bnd = 0.5°C PEr = 20 min

ANTIFREEZE TEMPERATURE (OFF)

Enabled ONLY for WINTER-HEATING operation.

Denotes the temperature that is kept when the programmable thermostat is in OFF status (key ①).

It can be set from 1^ C to 10^ C; factory setting is 6.0^ C.

It can be overridden selecting “---”.

UNIT OF MEASUREMENT (dEG)

To select the unit of measurement in degrees Celsius (C) or Fahrenheit (F).

For degrees ^ C, the minimum increase is 0.1 ^ C.

For degrees ^ F, the minimum increase is 0.2^ F.

SONDA ESTERNA (EST)

When enabled, this parameter displays the temperature measured by the external sensor model X.TEMP code VN883500 (optional) connected to the dedicated terminal (EXT NTC).

Temperature range: -40.0^ ÷ +60.0^ .

The external sensor can be installed at a maximum distance of 40 meters.

TEMPERATURE CONTROL SENSOR (5n5)

This parameter can only be viewed if the external sensor is enabled (ESt = YES).

It determines whether temperature control will be based on the temperature measured by the built-in sensor (Int) or by the External sensor (ESt).

ENABLING RS485 OUTPUT (605)

The terminals marked OUT BUS are dedicated to the remote control of CRONO.X through a phone dialer.

Select “YES” if the phone dialer connected is a X.CODE BUS code VE072500 for the GSM network and RS485 serial communication is used.

Select “nO” if the phone dialer connected provides a potential-free contact; (e.g. VN782900 X.CODE WAVE for landline phone and X.CODE BUS for GSM network used with a relay output).

As for operating the CRONO.X with a phone dialer, cfr. page 50.

MEMORY ADDRESS (Adr)

This can only be viewed if (bUS = YES).

It is a numeric value that identifies the device when connected to other devices (e.g. X.CODE BUS) through RS485 communication.

SETTINGS GUARD PASSWORD (PRS)

This is very useful when only authorized users are allowed to alter the settings (e.g.. offi ces, public premises, schools,...).

The selection may range between 000 and 999.

As for the instructions to enable the password-controlled settings, cfr. the description on page 52.

TOTAL OPERATING HOUR COUNT (tot)

The value indicates the number of hours in which the output relay was ON, i.e. when the contact between COM and NA was closed.

BATTERY CHARGE STATUS (BAT)

It indicates the battery charge percentage.

A full battery charge (100%) corresponds to 2.8V battery voltage; 0% corresponds to 1.8V (dead batteries).

DISPLAY BRIGHTNESS ADJUSTMENT (cnt)

It is meant to improve the CRONO.X display view by adapting it to the light existing in the premises in which it is installed.

Brightness ranges from 0 (light) and 15 (dark).

Default value is 8.

A brighter display uses more power and therefore causes battery autonomy to be shorter.

BATTERY REPLACEMENT

Use alkaline batteries only 2 x 1.5V (LR6 - AA size)

After removing the old batteries, place the new ones within one minute to avoid erasing the time and date settings (all the other settings will stay stored).

ERROR MESSAGES

When there is a fault that prevents correct operation, e.g. failure of the temperature-control sensor, the display reads “---” in place of the relevant temperature reading (from internal or external sensor).

• In case of sensor failure when CRONO.X is in WINTER-HEATING mode, the relay will go on for 10 minutes every 4 hours to prevent the system from freezing
• In case of sensor failure when CRONO.X is in SUMMER/AIR-CONDITIONING mode, the relay will stay permanently off

CONNECTION

Relay output

The system control must be connected between the relay output contacts COM and NA.

The relay contact is potential free (clean contact).

The maximum contact capacity is 8A/250Vca

External sensor (EXT NTC)

An optional NTC temperature sensor model X.TEMP (code VN883500) can be connected between terminals EXT NTC

This sensor can be placed at a maximum distance of 40 m (use a shielded cable).

The X.TEMP sensor can be used to read the temperature in another room or to control the temperature (only when SNS=YES and REG=EST).

Input for telephone dialer (OUT BUS)

The CRONO.X can be remote-switched on and off through a phone dialer. It is possible to connect a landline dialer (X.CODE WAVE code VN782900) or GSM dialer (X.CODE BUS code VE072500) or other dialer with a clean output contact, between the OUT BUS terminals. When connecting up a X.CODE BUS code VE072500 that uses the RS485 output, it is necessary to observe the correct connection polarity.

HARMONISED REFERENCE STANDARDS

Conformity with EU Directives:

2006/95/EEC amended by 93/68/EEC (Low Voltage Electrical Equipment) 89/336/EEC amended by 92/31/EEC and 93/68/EEC (EMC)

is declared with reference to the following harmonized standards:

Safety:

EN 60730-2-7: “Automatic electrical controls for household and similar use. Part 2: Particular requirements for timers and time switches” EN 60730-2-9: “Automatic electrical controls for household and similar use. Part 2: Particular requirements for temperature sensing controls”

Electromagnetic compatibility:

EN 61000-6-1: “Electromagnetic compatibility (EMC) - Part 6-1: Generic standards - Immunity for residential, commercial and light-industrial environments” EN 61000-6-3: “Electromagnetic compatibility (EMC). Part 6-3: Generic standards - Emission standard for residential, commercial and light-industrial environments”

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