Specifications

SARIgas Zoom Z – ZF Page 19
Rev.1
BLEEDING THE SYSTEM
If the air has not been completely bled from the system, the boiler will not work correctly. When the boiler has been
working in heating mode a few hours, bleed the system again as given on page 18.
If necessary, the system can be topped up with water.
PRECAUTIONS AGAINST FREEZING (house empty in the winter)
For short periods (12 – 24 hours)
- Turn the selector switch A to 'O'.
For long winter periods
The Zoom series of boilers are fitted with an "automatic antifreeze protection system" in the heating and hot water
circuit, which triggers when temperatures fall below 3 – 5°C.
This function activates the pump and the gas burner (at minimum rated output), as long as the boiler is electrically
driven and the knob A, Fig, 1, is turned to "I". When a temperature of around 35°C is reached in the heating circuit, the
"antifreeze system" is automatically deactivated. It is good practice, however, to protect the heating circuit with a
suitable, specific chemical additive (antifreeze) in a maximum proportion of 30% of the total water volume.
If the system is not protected with antifreeze, and the gas valves must be turned off upstream and the electrical supply
to the boiler turned off, empty the heating and the hot water circuits.
REGULATION WITH EXTERNAL CONTROL (optional)
The combination boiler can be controlled by an external regulation composed by:
- Remote Control; (code – set remote control 20572)
The remote control permits the control and the regulation of the combination boiler and the faults signalling (led).
The maximum distance between the combination boiler and the remote control must be 300 metres (Fig.26).
The remote control must be linked to the combination boiler using an independent electric pipe without cables under
voltage.
The remote control is easy to install and to use and it permits to the user to check the operating faults through the
luminous leds.
There are also other leds that permits to check the consumption of the boiler in real time. It’s also possible to link an
ambient thermostat to the remote control (see instructions below Fig.27 and 28).
- Ambient thermostat; It’s advisable to choose an high quality thermostat (with low differential). This ambient
thermostat must be linked to the connectors C and D of the regulation circuit (Fig.24). The electrical connection
must be cut off using a cable composed by two wires (in conformity with the local rules).
- Time clock; The time clock can be installed directly in the combination boiler using the set of components supplied
by SARIgas in order to make the installation easier. The time clock must be linked to the wires C and D after having
removed the existing electrical connection (Fig.29).
Warning: The wrong connection of the circuit “R1” with the circuit “M2” electrically connected, can cause
permanent damages on both circuits. Before connecting the electrical connection it is advisable
to verify visually the right position of both connectors.
WARNING: Before making the connections it’s necessary to disconnect the power supply.
WIRING DIAGRAM TO THE ROOM THERMOSTAT WIRING DIAGRAM TO THE POWER SUPPLY
WARNING: Fig.24 WARNING: Fig.25
In this king of connection, the existing connection wire
must be cut off from the connector C-D of the circuit M2.
The connecting wire to the C-D terminal must not be powered,
and must be connected to a "clean" On-Off contact.
Faulty connection of the C-D terminal: if the electric wire is
powered at 230 volt the adjustment card will burn out and
consequently cancel the guarantee terms.