Immergas MINI NIKE 3 E - Page 12

12
2-2
INSTALLATORUSER
MAINTENANCE TECHNICIAN
2.7 BOILER SHUTDOWN.
For complete boiler switch-o, press the “o”
button, disconnect the onmipolar switch outside
of the boiler and close the gas cock upstream
from the appliance. Never leave the boiler
switched on if le unused for prolonged periods.
2.8 RESTORE CENTRAL HEATING
SYSTEM PRESSURE.
Periodically check the system water pressure.
e boiler pressure gauge should read a pressure
between 1 and 1.2 bar.
If the pressure is below 1 bar (with the circuit cool)
restore normal pressure via the cock located in the
lower part of the boiler (Fig. 2-2).
N.B.: close the cock aer the operation.
If pressure values reach around 3 bar the safety
valve may be activated.
In this case, remove water from an air vent valve
of a radiator until 1 bar is reached or ask for as-
sistance from an authorised company.
In the event of frequent pressure drops, contact
qualied sta for assistance to eliminate the pos-
sible system leakage.
2.9 SYSTEM DRAINING.
To drain the boiler, use the special draining
valve (Fig. 2-2)
Before draining, ensure that the lling valve is
closed.
2.10 ANTIFREEZE PROTECTION.
The boiler has an anti-freeze function that
switches on automatically when the temperature
falls below 4°C (standard protection to minimum
temperature of -5°C). In order to guarantee the
integrity of the appliance and the domestic hot
water heating system in zones where the tempera-
ture falls below zero, we recommend the central
heating system is protected using anti-freeze
liquid. In the case of prolonged inactivity (second
case), we also recommend that:
- disconnect the electric power supply;
- the central heating circuit and boiler domestic
hot water circuit must be drained. In systems
that are drained frequently, lling must be car-
ried out with suitably treated water to eliminate
hardness that can cause lime-scale.
Key:
1 - Filling valve
2 - Draining valve
Bottom view.
2.11 CASE CLEANING.
Use damp cloths and neutral detergent to clean
the boiler casing. Never use abrasive or powder
detergents.
2.12 DECOMMISSIONING.
In the event of permanent shutdown of the boiler,
contact professional sta for the procedures and
ensure that the electrical, water and gas supply
lines are shut o and disconnected.