75
HEATING WITH OUTDOOR SENSOR AND ROOM THERMOSTAT
For proper use of the outdoor sensor it is compulsory to fit the room thermostat which adjusts delivery tempe-
rature T1 to ambient conditions.
For each outdoor temperature reading between the set T4 (via parameter n
°
6, adjustable between –20
°
C and
+10
°
C) and 30
°
C there corresponds a delivery temperature T1 between the T1 temperature set by the user on
the boiler (phase. n
°
4) and the minimum operating temperature fixed at 55
°
C (see boiler operation curve).
The graph-illustrated example shows T4 set to -10
°
C and delivery temperature set to 75
°
C. If, for example, the
outdoor sensor detects a temperature of –5
°
C and the room thermostat is requesting heat (contact closed) the
boiler will “try” to reach a delivery temperature of 65
°
C. If the room thermostat continues requesting heat the
delivery temperature increases by 10
°
C every ten minutes. Vice versa, if the thermostat contact opens the
delivery temperature falls by 1
°
C each elapsed minute. The chapter “PARAMETER DISPLAY AND
MODIFICATION” (page 69) shows admissible parameter values regarding outdoor sensor operation. The
values must be adjusted as follows:
Phase N
°
5
T1 heating minimum temperature adjustable between 15
°
C and 25
°
C.
6
T4 minimum outdoor temperature range –20
°
C to +10
°
C (adjusted on the basis of minimum design
temperature)
b
BOILER TYPE: adjusted to 00 (fixed): adjustment valid for installation of room temperature thermostat with
outdoor sensor.
BOILER OPERATION CURVE
