Technical data

Technical documentation

STZS ed. 06/03

ZEUS SUPERIOR

SAFETY DEVICES

Circulator antilock

The circulator (MP) is operated for 150 seconds after:

- 24 hours of inactivity with the SUM/WINT switch in SUMMER position

- 3 hours of inactivity with the SUM/WINT switch in WINTER position (radiator

antifreeze).

Delivery overheating

ventilation

If the temperature of the primary circuit read by the NTC central-heating sensor (NR)

exceeds 97°C, the fan is started until the temperature drops below 93 ºC.

NTC sensors faulty

(NR and NB)

The breakage of the d.h.w. sensor (NB) prevents operation in d.h.w. phase.

The breakage of the heat. sensor (NR) prevents operation in central-heating or d.h.w mode.

Pump post-circulation

To avoid overheating the water/gas exchanger, the pump is kept operating for:

- 150 seconds after a central heating, chimneysweep and heating antifreeze request

- 60 seconds after a d.h.w. request (in this case the electric 3-way valve is maintained in

d.h.w. position)

Sealed-chamber post-

ventilation

After burner switch-off after any type of request, the combustion chamber is washed and

the fan kept operating for 30 seconds.