ROTEX Heating Systems GmbH
7
6
Tap water operation
RHOB*AAV1H in combination with indirectly fired tank
The hot water supply takes precedence over the heating. When a tank sensor is used,
any CH request will be interrupted when the tank sensor detects a temperature of
5 degrees lower than the set value. After the fan has switched on (code
3
) and there
has been an ignition (code
4
), the boiler controller will switch to domestic water
operation (code
6
). When a tank thermostat is used, the heat request will start when
the thermostat is opened, and it will end when the thermostat closes again. The
fanspeed, and therefore the power of the unit, is in that case controlled by the boiler
controller on the basis of a fixed leaving water temperature. The domestic hot water
temperature can be set between 40°C and 65°C. The set tank temperature is displayed
on the operating panel during domestic hot water operation. You can press the service
button during tap water operation to read the actual tank temperature.
2.4
PC Interface
The boiler controller is provided with an interface for a PC. A PC can be connected by
means of a dongle, and the associated software. This facility enables you to follow the
behavior of the boiler controller, the unit and the heat installation over a long period.
2.5
Test programs
There is an option in the burner relay, to bring the unit into a test status.
Activating a test program, will switch on the unit with a set fan rotations per minute,
without the control functions intervening.
The safety functions do remain active.
The test program is ended by pressing and simultaneously.
Test programs
Description of program
Button combination
Display reading
Burner on with minimum DHW
capacity (see parameter d par. 7.2)
and
“L”
Burner on with set maximum CH
power (see parameter 3 par. 7.2)
and (1x)
“h”
Burner on with maximum DHW power
(see parameter 3 par. 7.2)
and (2x)
“H”
Switching off test program
and
Current operation
situation
During test mode the following data can be read :
• By pressing the button continuously in the display the CH water pressure is shown.
• By pressing the button continuously in the display the ionisation current is shown.
2.5.1
Frost protection
•
The unit is fitted with frost protection in order to prevent it from
freezing. If the temperature of the heat exchanger drops too low, the
pump will start running until the temperature of the heat exchanger
is sufficiently high. If the frost protection intervenes, the code
7
will
be displayed (heating up exchanger).
•
If the installation (or a part thereof) can freeze, the coldest place
should be fitted with an (external) frost thermostat on the return
pipe. This must be connected in accordance with the electrical
diagram (see par. 10.2).
Note
When the unit is switched off (
-
on the service display), the unit frost protection will
remain active, however a heating request from an (external) frost thermostat will be
ignored.
