Computherm Q3 User manual

COMPUTHERM

digital room thermostat

Operating Instructions

NEW

software!

For Evaluation Only.

Edited by Foxit PDF Editor

GENERAL DESCRIPTION OF THE THERMOSTAT

The

COMPUTHERM

Q3 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.

Temperature can be measured and set more precisely as compared

to simple, conventional thermostats. In heating mode, in accordance

with the selected switching sensitivity, the thermostat switches the

boiler or any other appliances on and off below and above the adjusted

temperature, respectively, and contributes to reduce energy costs while

maintaining comfort. In cooling mode it switches the opposite way.

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

±0.2°C (default setting). This means the difference between the ad-

justed temperature

and the actual tem-

peraturemeasured

during the switch-

ing process. In

case of the ±0.2°C

switching sensi-

tivity and heating

mode for example,

if the set tempera-

ture is 20°C, then

the device switch-

Temperature

measurement unit

Room temperature

is displayed

Set temperature

is displayed

Sign of heating

Sign of cooling

The information shown on the liquid crystal

display of the thermostat

includes the following:

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

above. Please refer to Section 4.1 for the modication of the factory

default switching sensitivity of ±0.2°C.

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 oor

level.

IMPORTANT WARNING!

If the radiator valves in your at 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 at.

2. INSTALLATION OF THE THERMOSTAT

To install the thermostat, detach the

• rear panel of the thermostat from the

front panel by loosening the screws at

the bottom of the cover as shown in the

gure.

With the help of the screws provided and

• some tools fasten the rear panel of the

device to the wall.

Using a small screwdriver, remove the cover of the• terminal block from the inner side of the rear panel.

The thermostat controls the boiler or air conditioner

through a potential-free alternating relay that has the

following connection points: No. 1 (NO); No. 2 (COM)

and No. 3 (NC). These connection points are located

under an inner cover on the inner side of the rear

panel.

Connectthetwoconnectionpointsoftheheatingorcoolingequipment

• to be controlled to terminals No. 1 (NO) and No. 2 (COM), i.e. to the

normally open terminals of the relay. If you would like to operate

an old boiler or any other device that has no connection points for

thermostats, then the No. 1 (NO) and No. 2 (COM) connection points

of the thermostat should be connected to the mains cable of the

device, similarly as a switch would be connected.

To prevent electric shock, replace the inner cover removed

for the connection of wires after the assembling process

has been completed.

ATTENTION! Always consider the loadability of the thermostat

and follow the manufacturer’s instructions of the heating or cooling

equipment. The device must be installed and connected by a

qualied professional. The voltage appearing at terminals No. 1 and

No. 2 depends 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 signicance.

3. PUTTING THE THERMOSTAT INTO OPERATION

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

housing. Insert 2 AA alkaline batteries (LR6 type) in accordance

withthediagraminthebatterycompartment.Afterthebatterieshave

been inserted, the display ashes the measured room temperature.

(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).

4. BASIC SETTINGS

After removing the rear panel of

the device, the following factory

default settings can be modied

by relocating the jumpers (black

plugs) located on the base

panel.

4.1 Selecting the Switching Sensitivity (Accuracy)

The switching sensitivity of the thermostat can be selected or

adjusted by the uppermost jumper.

With factory default settings the jumper is located on the central

and right pins, resulting in a switching sensitivity of ±0.2°C. It can

be modied to ±0.1°C by relocating the jumper onto the left and

central pins. 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 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), and the ±0.2°C switching sensitivity (factory

default setting) for heating systems with low thermal inertia (e.g.

at panel radiators).

4.2 Switching between the Heating and Cooling Mode

The heating or the cooling mode of the thermostat can be selected

by the central jumper.

With factory default settings the jumper is located on the central

and right pins, which selects the heating mode. By relocating the

jumper onto the left and central pins, the cooling mode can be

selected. The output terminals No. 1 and No. 2 of the thermostat

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

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