Immergas MYTHOS HP - Boiler Switch-Off; Prolonged Inactivity; Permanent Shutdown

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INSTALLER
USERMAINTENANCE TECHNICIAN
TECHNICAL DATA
2.8 BOILER SWITCHOFF
Press key " " until the following symbol appears " "
In these conditions the boiler is to be
considered still live.
Disconnect the general switch outside the boiler and close the gas
cock upstream of the appliance.
Never leave the boiler switched on if le unused for prolonged pe-
riods.
2.9 RESTORE CENTRAL HEATING SYSTEM
PRESSURE
1. Periodically check the system water pressure (the boiler pres-
sure gauge should read a value between 1 and 1.2 bar).
2. If pressure falls below 1 bar (with the system cold), restore nor-
mal pressure via the cock located at the bottom of the boiler
(Par. 1.6).
3. Close the cock aer the operation.
4. If the pressure reaches values around 3 bar, there is a risk of
tripping the safety valve (in this case, remove water from a ra-
diator air vent valve until a pressure of 1 bar is achieved, or ask
for assistance from professionally qualied personnel).
5. In the event of frequent pressure drops, contact qualied sta
for assistance to eliminate the possible system leakage.
2.10 DRAINING THE SYSTEM
Emptying the system
1. Ensure that the lling cock is closed.
2. Open the draining cock (Parag. 1.29).
3. Open all vent valves.
4. At the end, close the emptying cock.
5. Close all previously opened vent valves.
If glycol was input in the system’s circuit, make sure it is
discharged into the waste water system, pursuant to re-
gulation EN 1717.
2.11 EMPTYING THE D.H.W. CIRCUIT
To do this, always close the domestic cold water inlet upstream of
the appliance.
Open any domestic hot water tap to discharge the pressure from
the circuit.
2.12 ANTIFREEZE PROTECTION
e boiler has an antifreeze function that switches the burner on
automatically when the temperature falls below 4°C (standard
protection to minimum temperature of -5°C).
All information about the frost protection can be found in the In-
staller section.
In order to guarantee the integrity of the appliance and the dome-
stic hot water heating system in zones where the temperature falls
below zero, we recommend the central heating system is protected
using anti-freeze liquid and installation of the Immergas Antifre-
eze Kit in the boiler.
2.13 PROLONGED INACTIVITY
In case of prolonged inactivity (e.g. second home), we recom-
mend:
1. to switch o the power supply;
2. to completely empty the heating circuit and the boiler D.H.W.
circuit. In systems that are drained frequently, lling must be
carried out with suitably treated water to eliminate hardness
that can cause lime-scale.
2.14 CLEANING THE CASE
1. Use damp cloths and neutral detergent to clean the boiler ca-
sing.
Never use abrasive or powder detergents.
2.15 PERMANENT SHUTDOWN
In the event of permanent shutdown of the boiler, contact profes-
sional sta for the procedures and ensure that the electrical, water
and gas supply lines are shut o and disconnected.