DOMUSA TEKNIK MINNY Installation And Operating Instructions Manual Download

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MINNY

8.3

Heating circuit 2 functioning (Optional

Heating circuit 2 functioning (Optional))))

All the models in the

Minny

range of boilers have the option of controlling a second heating circuit.

This requires the installation of a second circulation pump on the boiler. To correctly install this
pump, carefully follow the instructions given in the “Installing heating circuit 2” section of this
manual.

Heating circuit 2 will work with the selected boiler setpoint temperature (see “

Selecting the boiler

setpoint temperature

”) and the temperature of room thermostat 2 (

TA2

) (if the boiler has one). The

burner and the heating pump of circuit 2 (

) will begin to function until the installation reaches

the selected boiler setpoint temperature (or the temperature on room thermostat 2, if the unit has
one). When the temperature of the installation drops below the selected boiler temperature, the
burner will start up again, running the heating cycle.

NOT

NOTE

E:::: When the heating function is disabled, if OFF is selected circuit 2 will

When the heating function is disabled, if OFF is selected circuit 2 will

When the heating function is disabled, if OFF is selected circuit 2 will also be disabled

also be disabled

also be disabled....

ADDITION

ADDITIONAL FUNCTIONS

AL FUNCTIONS

The

Minny

boiler is equipped with an electronic control for efficiently regulating automatic boiler

functioning. It also has the following additional control features:

9.1

Pump anti

Pump anti----block function

block function

This function prevents the boiler circulation pumps from seizing up if they have been out of use for
a long period. This system remains enabled while the boiler is plugged into the mains.

9.2

Anti

Anti----frost function

frost function

This function protects the boiler from freezing up during cold weather. If the boiler temperature
drops to below 6 ºC, the heating circulation pump will start up. If the boiler temperature continues
to drop and reaches 4 ºC, the burner will start up, heating the installation. When this function has
been activated, it will continue working until the boiler reaches 8ºC. This system remains on
standby while the boiler is plugged into the mains.

9.3

Boiler pressure sensor function

This function prevents boiler failure caused by a low water level or excess pressure in the boiler. The
pressure is detected by a pressure sensor

((((9

9))))

, and its value appears on the control panel display (see

“

Digital display

”). If the pressure drops below 0.5 bar, the electronic control blocks boiler

functioning and triggers the "

" alarm on the display. If boiler pressure exceeds 2.5 bar, the "

warning will flash on the display to warn of the excess pressure. If this should occur we recommend
calling the nearest

Technical Assistance Service

, and slightly draining the boiler

9.4

Telephone relay connection

The

Minny

boiler is designed to enable a phone relay to be connected for switching the boiler on

and off. This feature allows the boiler to be switched on and off remotely, from any location, by
means of a phone call. The relay is connected to the boiler via terminal strip

(see “

Electrical

Connection Diagram

”). When the telephone relay contact closes the boiler switches on. When the

contact opens, the boiler switches off and remains in anti-frost protection and pump anti-block
mode.