Ariston ALTEAS X FF - Page 16

Training manual ALTEAS X and GENUS X
Pag. 16 di 84
The pump is full modulating.
The pump speed change in relation with the boiler
power
PUMP
Speed control
Performed from the flow and return NTC. If
the temperature rise 102°C a lock out occurs,
indicated on the display with 1 01.
Overheat control
NORMAL BOILER OPERATION
After flame detection the boiler is free to
modulate the power according to the required
thermal load. Modulation is carried out
between the maximum heating power values
(adjustable from the control panel with
parameter 231) and the minimum power
value (set made on the gas valve). The shut
down temperature of the burner is operated
as follows:
 1° min after flame detection:
T off = T set-point + 8°C
 2° min after flame detection:
T off = T set-point + 6°C
 starting from the 3
rd
min after flame
detection:
T off = T set-point + 4°C
This logic is used to prevent the burner from
shutting down too quickly with the system at
temperature.
Next ignition can be delayed from 0 to 7
minutes (default value = 2 min., adjustable
from the control panel with parameter 236)
FLAME
MODULATION
N.B. Starting from heating request, the “limit temperature” (88°C, not adjustable fixed
value) remains on executed by the primary exchanger outlet probe (NTC 1).
If there is a bad circulation through the heating system, the automatic by-pass can be
opened (max capacity 350 l/h).