Bpt TH 450 - PI Programme Selection Guide

40
Programme Cycle duration Minimum ON time Proportional Range Type of system
P1
10 minutes 1 minute 1.5°C
Base for gas burner,
convector heaters,
zone valves, aluminium
radiators
P2
5 minutes 1 minute 1.5°C Electric radiators
P3
20 minutes 2 minutes 1.5°C
Radiant or underfloor
systems, cooling
P4
5-10-15-20-25-30-35-40
minutes
from 1 to 5 minutes from 1°C to 3°C
Table 1
Proportional/integral programme selection (refer to
table 1)
19.1- Open the cover.
19.2- Make sure that the unit is in MANUAL operating
mode.
19.3- Press button P three times (fig. 61).
On the display, in place of the hour, will be dis-
played and, in place of the indication for the tempera-
ture, will appear .
19.4 - Press button (forward) or (backwards) (fig.
64) to select the integrated proportional control system.
On the display, in place of the temperature, will
appear (fig. 64).
19.5 - Press button P on the display. In place of the
time will appear (fig. 65).
19.6 - Press button (forward) or (backwards)