Computherm Q7 User manual

COMPUTHERM Q7
Programmable, digital room thermostat
Operating Instructions

GENERAL DESCRIPTION OF THE THERMOSTAT
The COMPUTHERM Q7 type switched-mode room thermostat
is suitable to regulate the overwhelming majority of boilers 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 24 V or
230 V control circuit.
The device can be pro-
grammed according to
customer-specific require-
ments so that the heating/
cooling system heats/cools
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your residence or office to the
required temperature at the
dates and times specified by
you, to reduce energy costs
while maintaining comfort.
Separate independent daily
temperature programs can
be prepared for each day
of the week. Six switching
times (which can be set at
10-minute intervals) can be
selected at your discretion
every day, and separate tem-
peratures (which can be ad-
justed in 0.5°C increments)
can be selected for each
switching time.
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The buttons of the thermostat
HOLD
DAY
LIGHT
COPY
PROG
SET
RESET

The switching sensitivity of the thermostat can be selected:
±0.2°C (factory default setting, recommended for radiator-based
heating systems) or +0/-0.2°C (this setting is recommended for
underfloor heating). This figure means the temperature difference
between the adjusted value and the actual temperature measured
during the switching process. For example, if the factory default setting
is 20°C on the thermostat then the device switches on the boiler at
19.8°C or below this level and switches it off at 20.2°C or above.
(Please refer to Section 2.3 for the modification 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 3.4.
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The information shown on the liquid crystal
display of the thermostat includes the following:
The days of the week
Time
Manual control indicator
Programme number
Current temperature
of the room
Set temperature
Timed manual control
indication
Dead battery
Sign of boiler in operation
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1. LOCATION OF THE DEVICE
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 floor level.
IMPORTANT WARNING!
If the radiator valves in your flat are equipped with a thermostatic
head, replace the thermostatic head of the radiator valve with
manual control knob or adjust it to maximum temperature in the
room where the room thermostat is to be located, otherwise the
thermostatic head may disturb the temperature control of the flat.
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2. INSTALLATION OF THE THERMOSTAT
• Pressing the lock on the
upper side of the hous-
ing of the thermostat, re-
move the back cover of the
thermostat as shown in the
figure below.
• With the help of the screws
provided and some tools fas-
ten the rear panel of the de-
vice to the wall.
• Using a small screwdriver,
remove the cover of the ter-
minal block from the inner
side of the rear panel.
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Vertical angle:
30 - 45°
Latch

•The output relay of the thermostat has three potential-free
connection points, i.e. No. 1 (NO); No. 2 (COM) and No. 3 (NC),
which are located under an inner cover on the inner side of the rear
panel. To control heating, connect the two connection wires of the
device to be controlled to terminals No. 1 (NO) and No. 2 (COM), i.e.
to the normally open terminals of the relay, while the two connection
wires of the cooling equipment should be connected to terminals
No. 2 (COM) and No. 3 (NC), i.e. to the normally closed terminals
of the relay.
•To prevent electric shock, replace the inner cover removed for
the connection of wires after the assembling process has been
completed.
ATTENTION! The device must be installed and connected by a
qualified professional. Always follow the manufacturer’s instructions
when connecting the thermostat to any heating or cooling appliance.
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The voltage appearing at terminal No. 1, No. 2or No. 3depends only
on the system being controlled, therefore the dimensions of the wire
are determined by the type of the device to be controlled. The length
of the wire is of no significance.
3. PUTTING THE THERMOSTAT INTO OPERATION,
BASIC SETTINGS
3.1 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
figure above.
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 flashes the day, time and program number as
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well as 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 or graphite pencil).
After the batteries have been inserted, press the “SET” button. After
the “SET” button is pressed, the display stops flashing, the thermostat
goes to the main screen and the setting process can be started. After
inserting the batteries, snap the front panel of the device into the rear
panel mounted on the wall.
3.2 Setting current day and hour
Press the “DAY” button. At this time only the serial number of the
day will flash on the display of the thermostat and the hour and minute
values can be seen.
Usingthelargeorbuttononthefrontpanelofthedevice,
set the serial number of the current day (Monday 1; Tuesday 2;
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Wednesday3,etc.).
Press the “DAY” button again. At this time the number indicating
the day stops flashing and becomes visible continuously while the
numbers indicating the hour will flash on the display. Using the
large or button 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 flashing and become visible
continuously, while the numbers indicating the minute will begin
flashing.Usingthelargeorbuttononthefrontpanelofthe
device, set the minute value of the current time.
Whenyouwishtomodifysettings,pleasepressthe“DAY” button
again to return to the initial settings. If you wish to finish settings,
acknowledge them by pressing the “SET” button. At this point adjusted
data are recorded and the device goes back to the main screen.
(After approximately 10 seconds, the settings are automatically
acknowledged and the device goes back to the main screen).
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3.3 Setting switching sensitivity
According to factory default settings, the switching sensitivity is
±0.2°C (the display indicates this setting with symbol “S:1”) which
can be modified to +0/-0.2°C (the display indicates this setting with
symbol “S:2”). The required switching sensitivity can be set by
pressing ”DAY”, “COPY” and the large or buttons one after
the other, after going back to the main screen by pressing the “SET”
button. Setting “S:1” (±0.2°C switching sensitivity) or “S:2” (+0/-0
.2°C switching sensitivity) is acknowledged by pressing the “SET”
button. (After approximately 10 seconds, the settings are automati-
cally acknowledged and the device goes back to the main screen).
Pressing the “RESET” button the switching sensitivity is reset to fac-
tory default setting, i.e. to ±0.2°C level (“S:1”).
The ±0.2°C switching sensitivity ensured by factory default
settings (the display shows symbol “S:1” for this setting) is primarily
recommended for radiator-based central heating systems (e.g.
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where plate radiators are installed) with low thermal inertia, while
the +0/-0.2°C switching sensitivity (the display shows symbol “S:2”
for this setting) is recommended to control heating systems with high
thermal inertia (e.g. underfloor heating).
3.4 Activation of the pump protection function
Underthefactorydefaultsettings,thepumpprotectionfunction
is inactive. It can be activated or switched off by pressing “DAY”,
“PROG” and the large or buttons one after the other, after
going back to the main screen by pressing the “SET” button. Setting
“HP:OFF” (switched-off) or “HP:ON” (activated) is acknowledged
by pressing the “SET” button. (After approximately 10 seconds
settings are automatically acknowledged and the device goes back
to the main screen). By pressing the “RESET” button, the pipe
protection function is reset to factory default setting (“HP:OFF”).
To prevent the pump from sticking, the activated pump
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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 on the thermostat for this period, e.g. +10°C, to
prevent the boiler from unnecessary start-ups when the weather
turns cold temporarily).
4. PROGRAMMING THE THERMOSTAT
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. Six separate switching times can
be selected at your discretion for each day of the week, and a separate
temperature can be set for each switching time. The temperature set for a
given switch will remain valid until the time of the next switch. Accordingly,
the thermostat will keep the temperature set for switching time P1 until

Temperature
Time
7:00 9:00 12:30 15:00 17:30 23:00
switching time P2 is reached. After switching time P2 the temperature
selected to switch P2 will be valid.
Note! The software of the thermostat will only enable increasing consecutive times
to be set, in accordance with the serial number (P1; P2; etc.) of the switches.
Withfactorydefaultsettingsthedevicewillperformthefollowing
switches each day of the week:
P1 7:00 20°C
P2 9:00 17°C
P3 12:30 20°C
P4 15:00 19°C
P5 17:30 22°C
P6 23:00 17°C
The following diagram
shows the temperature
pattern according to
factory default settings for
24 hours a day.
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The temperature pattern, of course, can be freely modified so that a
temperature curve is available for each day of the week to meet your
needs in the best possible way.
4.1 Programming steps:
•Pressthe“SET” button to go back to the main screen.
•Press the “SET” button again and hold it down and press the
“PROG” button, too. At this point the device gets into programming
mode and the numbers indicating the days of the week (1 2 3 4 5
6 7) are flashing on the display.
•Select the day to be programmed or all days of the week by
pressing, or pressing repeatedly, the large........or........button
on the front panel of the device. If you wish to write the same
program for each day of the week, it is reasonable to choose all
days of the week (1 2 3 4 5 6 7) simultaneously, this way there is
no need to perform separate programming of the days. If you wish
to write a different program for each day, programming should

be performed separately for each day of the week, selecting the
days one by one. (If there are days for which you intend tocreate
the same program, it is sufficient to create the program only
once, because it can easily be applied to any other day with the
help of the “COPY” button as described in Section 4.2).
•Pressthe“PROG” button again. At that point the next programming
step should be done, i.e. the starting time of switch P1 should be
set, which is indicated on the display of the device by flashing the
time value to be set.
•Set the starting time of switch P1 by pressing, or pressing
repeatedly, the large........or........button on the front panel of the
device. (The time can be set at 10-minute intervals).
•Pressthe“PROG” button again. At this point the next programming
step should be performed, i.e. the temperature of switch P1
should be set, which is indicated on the display of the device by
flashing the temperature value to be set.
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•Set the temperature level of switch P1 by pressing, or pressing
repeatedly, the large........or........button on the front panel of the
device. (The temperature can be set in 0.5°C increments).
•Pressthe“PROG” button again. At this point the next programming
step should be performed, i.e. the starting time of switch P2
should be set. As in the previous steps, the time value to be set
will flash on the display.
• Ifyoudonotneedallthesixswitcheseveryday,thenyoucan
omit the switch adjustment by pressing the “DAY” button while
the temperature or time of the unnecessary switch is being set.
The display shows this process by means of lines (- - - -), which
appear on the time and temperature segments. The omitted
switch can be restored or activated at any time by repeating the
steps described above. (ATTENTION! After reactivating a switch
that has been omitted before, inspect and correct, if required,
the device so that the times of switches are consecutive, in
accordance with the serial numbers of the switches!)
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•Similarly to the previous steps, with the help of “PROG” button and
the large and/or buttons perform settings until the time and
temperature of switch P6 is set.
•After the temperature of switch P6 has been set, by repeated
pressing of the “PROG” button the set values can be inspected and
data can be modified by repeating the steps described above.
•Afteryouhavesetallvalues,pressthe“SET” button to acknowledge
set values and to go back to the main screen. (After approximately
10 seconds the set values will be automatically acknowledged and
the device will go back to the main screen).
•Set values can be freely modified at any time by repeating the
programming steps.
4.2 Copying a program with the help of the “COPY” button
•Pressthe“SET” button to go back to the main screen.
•Pressthe“COPY” button for approximately 5 seconds to activate
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the “COPY” function. The notice “COPY” appearing in place of
the hour characters and the flashing serial number 1 indicating
Monday shows that conditions are ready for copying a program.
•Selecttheday(e.g.2)whoseprogramyouwishtocopytoanother
day or other days by pressing, or pressing repeatedly, the
large........or........button on the front panel of the device.
•Press the “COPY” button to copy the program of the selected
day. After copying has been finished, the flashing of the number
indicating the day that has been copied stops and will become
visible continuously, while the notice “COPY” can also be seen.
•Select the day (e.g. 3) to which you wish to copy the program
of the day copied beforehand (e.g. 2) by pressing, or pressing
repeatedly, the large........or........button on the front panel of the
device. After selecting the number that indicates the day, press the
“COPY” button to copy the program to the selected day.
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