Computherm Q7 rf User manual

COMPUTHERM

Q7RF

Programmable wireless (radio-frequency)

digital room thermostat

Operating Instructions

NEW

software!

For Evaluation Only.

Edited by Foxit PDF Editor

GENERAL DESCRIPTION OF THE THERMOSTAT

The

COMPUTHERM

Q7RF type switched-mode room thermostat is suitable

to regulate the overwhelming majority of boilers and air conditioners available

in Hungary. It can easily be connected to any gas boiler or air conditioning

device that has a double wire connector for a room thermostat, regardless of

whether it has a 24V or 230V control circuit.

The device can be programmed according to customer-specic requirements

so that the heating/cooling system heats/cools your residence or ofce to

the required temperature at the dates and times specied by you, to reduce

energy costs while maintaining comfort. Separate temperature programs can

be prepared for each day of the week. For each day, beside 1 xed switching

time, 6 adjustable switching times can be set and a different temperature can

be assigned to all 7 switching times.

The device consists of two units. One of them is the portable control unit

(thermostat),whiletheotherunitisthereceiverthatcontrolstheboiler.Because

there is a wireless (radio-frequency) connection between the two units, no

cable is required between the thermostat and the boiler. The two units have

been tuned in the factory so that they operate at the same frequency. The

trouble-free operation is ensured by its own security code. The installation

and connection of the receiver unit is described in Section 9.

To increase the lifetime of the batteries, the thermostat will not transmit signals

continuously. Instead it will repeatedly transmit the actual signal every 8

minutes. Therefore, the regulation of the heating or cooling will continue even

after a blackout.

The portability of the thermostat offers the following advantages:

no need to lay a cable, which is especially advantageous when old

• buildings are being modernized,

the optimal location of the device can be selected during operation,• itisalsoadvantageouswhenyouintendtolocatethethermostatindifferent• rooms in the course of the day (e.g. in the living room during the day but

in the bedroom at night).

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Boiler

Reciever

230V AC

50-60 Hz

Thermostat

230V AC

50-60 Hz

The effective range of the transmitter incorporated in the thermostat is

approximately 50m in open terrain. This distance may become considerably

shorter within a building, especially when a metal structure, reinforced

concrete or adobe wall stands in the way of radio waves.

The switching sensitivity of the thermostat can be set to ±0.1°C, ±0.2°C

(default setting) or ±0.3°C. This gure means the temperature difference

between the adjusted value and the actual temperature measured during

the switching process. In case of the ±0.2°C switching sensitivity and

heating mode for example, if the set temperature is 20°C, then the device

switches the boiler on at 19.8°C or below, and switches it off at 20.2°C or

above. Please refer to Section 2.4 for the modication of the factory default

switching sensitivity of ±0.2°C.

The thermostat is equipped with a pump protection function, which,

to prevent the pump from sticking, switches on the boiler for a one minute

period at 12:00 p.m. every day if the pump has not been switched on in

a programmed manner for more than 24 hours (e.g. outside the heating

season). See the activation of the pump protection function in Section 2.5.

This wireless (radio-frequency) thermostat can also be easily extended with

the

COMPUTHERM

Q1RX socket if needed, with which the thermostat is

able to control boilers or any other electrical devices operating on 230V

(50Hz; max. 10A) (e.g. fan heaters, pumps, zone valves, etc.) according to

the room temperature.

The information shown on the liquid crystal display of the

thermostat includes the following:

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The days of the week

Time

Manual control indicator

Programme number

Current temperature

of the room

Temperature

modication until the

next manual interference

Timed manual control

indication

Low battery voltage

Sign of heating/cooling

Set temperature

Vertical angle:

30 - 45° Latch

1. LOCATION OF THE DEVICE

The thermostat of the

COMPUTHERM

Q7RF type device can be freely moved

in your residence. It is reasonable to locate it in a room used regularly or

for many hours per day so that it is in the direction of natural ventilation in

the room but protected from drought or extreme heat (e.g. direct sunlight,

refrigerator, chimney, etc). Its optimal location is 1.5 m above oor level. It can

be placed on its own stand or can be mounted on a wall.

IMPORTANT WARNING! If the radiator valves in your flat are equipped

with a thermostatic head, adjust it to maximum temperature or replace

the thermostatic head of the radiator valve with a manual control knob

in the room where the room thermostat is to be located, otherwise the

thermostatic head may disturb the temperature control of the flat.

2. PUTTING THE THERMOSTAT INTO OPERATION,

BASIC SETTINGS

2.1 Inserting batteries

Pressing the lock on the upper side of the housing of the thermostat, remove

the back cover of the thermostat as shown in the gure below.

The battery compartment is in the inner side of the front panel of the housing.

Insert 2 AA alkaline batteries (LR6 type) in accordance with the diagram in

the battery compartment. After the batteries have been inserted, the display

ashes the day, time and program number as well as the adjusted and

measured temperatures. (If this information fails to appear on the display,

press the “RESET” button with a wooden or plastic stick. To press the button,

do not use any electrically conductive materials, e.g. graphite pencil.) After

the batteries have been inserted, snap the front panel of the device into the

rear panel and press the “SET” button. After the “SET” button is pressed,

the display stops ashing, the thermostat goes to the main screen and the

setting process can be started.

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2.2 Setting the current day and time

Press the “SET” button to go to the main screen, then press the “DAY” button.

At this time only the serial number of the day will ash on the display of the

thermostat and the hour and minute values can be seen.

Using the large and buttons on the front panel of the device, set the

serial number of the current day (Monday 1; Tuesday 2; Wednesday 3, etc.).

Press the “DAY” button again. At this time the number indicating the day stops

ashing and becomes visible continuously while the numbers indicating the

hour will ash on the display. Using the large and buttons on the front

panel of the device, set the hour value of the current time. Press the “DAY”

button again. At this time the numbers that indicate the hour stop ashing

and become visible continuously, while the numbers indicating the minute will

begin ashing. Using the large and buttons on the front panel of the

device, set the minute value of the current time.

When you wish to continue modifying the settings, please press the “DAY”

button again. If you wish to nish settings, conrm them by pressing the “SET”

button. At this point adjusted data are recorded and the device goes back to

the main screen (if no buttons are pressed for at least 15 seconds, the settings

are automatically conrmed and the device goes back to the main screen).

2.3 Switching between the heating and cooling mode

There is a possibility to easily switch between the heating and cooling mode

of the thermostat. The output terminals No. 1 and No. 2 of the receiver unit

are closed below the set temperature in heating mode, and they are closed

above the set temperature in cooling mode (taking the switching sensitivity

into account). The closed state of the output terminals No. 1 and No. 2 are

indicated by the icon in the bottom left corner of the display in case of both

modes.

To switch between the two modes, rst press the “SET” button to go to the

main screen. Then press the “SET” button again and hold it down and press

the “COPY” button, too. After this, the notice “HE AT ” or “ ” appears in

place of the time characters, according to the selected mode. Following this,

switch between the modes using the large and buttons, then conrm

it by pressing the “SET” button (if no buttons are pressed for at least 15

seconds, the setting is automatically conrmed). After this conrmation, the

device goes back to the main screen.

2.4 Setting the switching sensitivity (accuracy)

The switching sensitivity means the temperature difference between the

adjusted value and the actual temperature measured during the switching

process. A smaller switching sensitivity results in steadier room temperature

and therefore in higher comfort. The heat loss of the room (building) does not

depend on the switching sensitivity.

If higher comfort is needed, the switching sensitivity should be set so that it

provides a steadier room temperature. On the other hand, please also take

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into account that the boiler should not switch on and off multiple times in an

hour’s time except at low outside temperatures (e.g. -10°C), since the frequent

on and off switches of the boiler reduce its efciency and hence increases the

gas consumption. We recommend using the ±0.1°C switching sensitivity for

heating systems with high thermal inertia (e.g. underoor heating), the ±0.2°C

(factory default setting) and ±0.3°C switching sensitivity for heating systems

with low thermal inertia (e.g. at panel radiators).

To change the switching sensitivity, rst press the “SET” button to go to the

main screen. Then press the “DAY” and “COPY” buttons one after the other.

Following this, select the desired switching sensitivity using the large and

buttons. The notices “S:1 ”, “S:2 ” and “S:3 ” indicate ±0.1°C, ±0.2°C and

±0.3°C, respectively. Finally, conrm the setting by pressing the “SET” button

(if no buttons are pressed for at least 15 seconds, the setting is automatically

conrmed). After this conrmation, the device goes back to the main screen.

2.5 Activation of the pump protection function

Under the factory default settings, the pump protection function is inactive.

In order to activate or deactivate it, rst press the “SET” button to go to the

main screen. Then press the “DAY” and “PROG” buttons one after the other.

Following this, activate or deactivate this function using the large and

buttons. The notices “HP:ON” and “HP:OF” indicate activated and deactivated

state, respectively. Finally, conrm the setting by pressing the “SET” button

(if no buttons are pressed for at least 15 seconds, the setting is automatically

conrmed). After this conrmation, the device goes back to the main screen.

To prevent the pump from sticking, the activated pump protection function

switches on the boiler for a one minute period at 12:00 p.m. every day outside

the heating season. (The pump protection function can accomplish its task only

if the boiler is in working order in the summer, too. It is reasonable to set a low

temperature level, e.g. +10°C, on the thermostat for this period, to prevent the

boiler from unnecessary start-ups when the weather turns cold temporarily).

2.6 Calibrating the thermometer of the thermostat

There is a possibility to calibrate the thermometer of the thermostat (to correct

the measured temperature). In order to do this, rst press the “SET” button to

go to the main screen. Then press the “DAY” and “HOLD” buttons one after

the other. After this, the notice “ ” appears in place of the time characters,

and the correction value appears in place of the measured temperature

(0.0°C by default). Following this, set the desired correction value using the

large and buttons between -3.0°C and +3.0°C, in 0.1°C increments.

Finally, conrm the setting by pressing the “SET” button (if no buttons are

pressed for at least 15 seconds, the setting is automatically conrmed). After

this conrmation, the device goes back to the main screen. The correction

of the measured temperature takes effect a couple of seconds after the

conrmation.

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3. PROGRAMMING THE THERMOSTAT

3.1 A brief introduction to programming

• Programming means the setting of switching times and selection of

accompanying temperature levels. The device can be programmed for a

one-week period. Its operation is automatic, and it will cyclically repeat the

programs that have been keyed in. For each day, beside 1 xed switching

time, 6 adjustable switching times can be set. For all switching times a

different temperature can be assigned between 5 and 35°C, in 0.5°C

increments. The temperature set for a given switch will remain valid until

the start time of the next switch. Accordingly, the thermostat will keep the

temperature set for switching time P0until switching time P1is reached.

After switching time P1the temperature selected to switch P1will be valid

until the time of the next switch (P2).

• The start time of switch P0is 00:00, which cannot be changed, only its

temperature can be adjusted. So under the factory default settings, the

thermostat performs only one switch (P0) every day, which is in effect

from 00:00 until 00:00 the next day.

Note:Settingjustoneswitchforaday(factorydefaultsetting)isreasonable

only if a constant temperature is needed all day. (For example, if for every

weekday a constant 16°C, and for every weekend a constant 22°C is

needed.) Otherwise, from both a comfort and an energy-efciency point

of view, it is recommended to activate more than one switch for each day.

Furthermore, it is advised that a comfort temperature is used only those

times, when the room or building is in use, since every 1°C decrease of

temperature saves approximately 6% energy during a heating season.

As opposed to common belief, keeping a at warm requires more energy

than heating it up. (When using a stove, more gas is needed to keep a pan

of water boiling than to just keep it warm.)

• The P1-P6switches are deactivated by factory default (their start time is

--:--), but they can be activated at need. Their start time can be freely

setbetween 00:10 and 23:50 at 10-minuteintervals giventhe constraint,

thattheirstarttimeshouldbeinincreasingorderandadifferenceofatleast

10 minutes should be between them. This minimum 10-minute difference

is going to be preserved even if a previously activated switch is modied,

in order to avoid co-occurring or overlapping switches. In such a case,

the device automatically increases the start time of the affected switches

until a difference of at least 10 minutes between them is reached. If the

start time of a switch would be later than 23:50 because of this automatic

modication, then that switch is deactivated instead.

• In order to enter the programming mode, press the “SET” button and

hold it down and press the “PROG” button, too. During the programming

the values being adjusted are ashing on the display. The modication

of these values can always be done using the large and buttons.

The conrmation of a value is always done by pressing the “PROG”

button, after which the next value can be adjusted. The program can be

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saved by pressing the “SET” button. A more detailed description of the

programming steps can be found in Section 3.3.

• If there are days, for which the same program is needed, than it is sufcient

to create that program only once, since it can be easily copied to another

day using the “COPY” button as described in Section 3.4. If the same

program is needed for every day, then there is also a possibility to create

the program of all the days together (by selecting 1 2 3 4 5 6 7 together

during the selection of days). But be aware: if the program of all the days

are created together, than their program can only be modied together.

Therefore, if a different program is needed for at least one day, then the

program of the days should be created separately, and the repeated

programs should be copied using the “COPY” button.

• A separate program can be created for the heating and cooling mode,

and these programs are preserved when switching between the modes.

Therefore, if the thermostat is used for both heating and cooling, then

there is no need to modify the program of the thermostat every time a

switch between these modes is performed.

3.2 Recommendations for creating a heating program

The average comfort needs of a person can usually be satised by a

temperature of 19-21°C during the night, and a temperature of 22-23°C during

the day. During that time of the day, when the family is at work or school, only

a lower temperature is needed. As heating up and cooling down usually takes

a long time, it is reasonable to set the start time of the switches 0.5-1 hour

before the desired time of the modied temperature. The programmability of

the thermostat provides a perfect solution for this.

For an average working family, a program similar to the one below is

recommended:

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Temperature

Time