Maintenance Operations - Immergas Zeus Maior 24 Instruction Booklet

Zeus Maior 24 Instructions

Maintenance Operations

Lack of water in boiler.
Periodically check the system water pressure. Make sure that the pressure in the system is between 1
and 1.2 bar. N.B. Close the filling valve on completion. If pressure valves reach around 3 bar the safety
valve may be activated. In this case contact a service technician for assistance. In the event of frequent
pressure drops, contact your plumber to eliminate system leakage.
System flow NTC sensor fault.
If a problem is detected with the system delivery NTC sensor, the boiler will not start; call a qualified techni-
cian.
Domestic circuit NTC sensor fault.
If the unit detects an problem in the domestic circuit NTC sensor, the boiler will not produce domestic hot
water; call a qualified technician.
No water circulating.
This occurs if there is overheating in the boiler due to insufficient water circulation through the boiler - check
that shutoff valves are not closed and that the system is free of air . Check that the circulating pump is run-
ning freely. If necessary, remove the pump cover screw and manually rotate the pump impellor using a flat
bladed screwdriver. If lockout occurs repeatedly, contact a qualified technician for assistance.
Draining the system.
To drain the boiler, use the special drain cock. Before draining, ensure that the filling valve is not con-
nected.
Draining the DHW tank.
To drain the tank, use the special drain cock. N.B.: Before carrying out this operation, close the tank cold
water inlet cock and open any domestic circuit hot water cock to allow air to enter the tank.
Anti-freeze protection.
The boiler comes standard with an anti-freeze function that starts the pump and burner when the water tem-
perature inside the boiler falls below 4°C and stops on exceeding 42°C. The anti-freeze function is opera-
tional if the boiler is in normal mode and not in "lockout" status, and is electrically connected with the main
switch is set to Summer or Winter. To avoid continued operation in the event of prolonged absence, the
system should be drained completely or anti-freeze should be added to the heating system water. In both
cases the boiler domestic water circuit must be drained. In appliances subject to frequent draining, the sys-
tem must be refilled with suitably treated water. Do not use hard water to fill the system or there will be
scale formation in the boiler.
Casing Cleaning:
Use damp cloths and neutral
detergent to clean the boiler casing. Never use abrasive or powder
detergents.