Safety Devices - Immergas ZEUS Maior Manual

Technical Documentation
Max. central heating power
trimmer
(MAX. HEAT. POW.)
Min central heating power
trimmer
(MIN HEAT. POW.)
Circulator antiblock
device/3-way diverter valve
No ignition block
Safety thermostat block
(E4)
Insufficient circulation
Post-circulation pump
NTC probe breakage
(B1 and B2)
STZM@ ed 05/04
This trimmer is used to adjust maximum output in the central heating phase, adapting it
to system requirements (from the minimum up to the maximum set on the gas valve).
This trimmer is used to adjust the minimum modulated output in the central heating phase
(from minimum to 2/3rds of the maximum set on the gas valve).
This adjustment is possible in the first 60 seconds after ignition in the central heating mode.

Safety devices.

The circulator (M1) and 3-way diverter valve (M3) are turned on for 60 seconds after:
- 24 hours of inactivity with the SUMMER/WINTER main switch on SUMMER.
- 3 hours of inactivity with the SUMMER/WINTER main switch on WINTER (radiator
antifreeze).
If, within 24 seconds from the start of the ignition cycle, the detection electrode (E2) fails
to detect the flame on the burner, boiler operation is blocked.
To start the appliance working again put the main switch (S5) momentarily on RESET
and make either a domestic hot water or central heating request.
The (red) LED H2 turns on to signal this fault.
If the overtemperature safety thermostat contact opens boiler operation is blocked.
To get the boiler working again put the main switch (S5) momentarily on RESET and
then make either a domestic hot water or central heating request.
The (red) LED H2 flashes to signal this fault.
To prevent the water-gas exchanger from overheating in the case of a blocked pump or
if there is not much water circulating in the primary circuit, when the central heating
NTC delivery probe (B1) detects an increase in temperature that exceeds 5°C/second, the
burner is switched off.
The (red) LED H2 turns on and the (yellow) LED H1 flashes to signal this fault.
To prevent the water-gas exchanger from overheating the circulator (M1) is kept working
for:
- 150 seconds at the end of a central heating (room thermostat opens), chimneysweep or
central heating antifreeze request.
- 60 seconds at the end of a domestic hot water request. In this case, the electric 3-way
diverter valve is kept in the d.h.w. position.
A d.h.w. probe (B2) malfunction stops operation in the d.h.w. mode.
A delivery probe (B1) malfunction stops operation in both the heating and d.h.w.
modes.
The (yellow) LED H2 flashes to signal breakage.
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Technical Documentation
ZEUS Maior @