Heating With Outdoor Sensor And Room Thermostat - Joannes EPOCA 25-29 NS Installation And Maintenance Manual

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.
T4 minimum outdoor temperature range –20°C to +10°C (adjusted on the basis of minimum design
6
temperature)
b BOILER TYPE: adjusted to 00 (fixed): adjustment valid for installation of room temperature thermostat with
outdoor sensor.
BOILER OPERATION CURVE
75