48
METEO GREEN HE R.S.I.
SOLUTION B
System
Temperature
External Probe
Heating call
Direct
High or Low
Installed
Rec07
TRADITIONAL SYSTEM – RADIATORS HIGH TEMP.
UNDERFLOOR HETING SYSTEM
With Parameter nr.20=1, and then with Par. nr. 21 and Par.22 we define the maximum and minimum limit of the Heating Set Point (SP).
With the external probe and the Rec07 request, the system can work in 2 ways, according to Parameter nr.44:
- If the Par.44=0, the thermoregulation is managed by the Rec07 which uses both its ambient probe and the boiler external one. With the parameter “HEAT
SLOPE”, we define the external probe curve and with the parameter “ROOM – INFL”, the compensation of the ambient probe. With the parameter “MIN
T-HS” (Minimum Flow Temperature) and the parameter “MAX T-HS” (Maximum Flow Temperature), we define the maximum and the minimum limit of
the calculated flow temperature.
Example for high temperature:
parameter “HEAT SLOPE”=2 and parameter “ROOM – INFL”=5. If we have an ambient temperature of 18°C vs 20°C
as ambient temperature set point, and 0°C outside, , we have accordingly a flow temperature of 67.5°C calculated by the Rec07 (“HEAT SLOPE”=2)
increased of (20-18) x 5 (“ROOM – INFL”)= 77,5°C.
Example for low temperature:
parameter “HEAT SLOPE”=0,5 and parameter “ROOM – INFL”=2. If we have an ambient temperature of 18°C vs 20° as
ambient temperature set point and 0°C outside, therefore we have a flow temperature of 30°C calculated by the Rec07 (“HEAT SLOPE”=0,5) increased
of (20-18) x2 (“ROOM – INFL”)= 34°C.
- The Rec07 defines the flow temperature thanks to the combined thermoregulation between the ambient probe and the external probe, always restricted
between “MAX T-HS” – Maximum Flow Temperature (80°C default) and “MIN T-HS” – Minimum Flow Temperature (30°C default).
- With Parameter nr. 44=1 (default), the external probe thermoregulation is managed by the boiler electronic PCB (AE02). With Parameter nr.45 it is
defined the thermoregulation curve: 20 (default) for systems with high temperature, 10 for systems with low temperature, but the value can be modified
according to the system characteristics. It is suggested to keep the Parameter nr.3 = 5 and use the Parameter nr.65 to define the reactivity value of the
external probe. If the house is new and well insulated, the Parameter nr.65 can be set at 20÷25 as the internal temperature varies more slowly than the
external one. If the house is scarcely insulated, it is advisable to set values between 10÷15. Rotating the ENCODER for Central Heating settings it is
possible to optimize the curve with a translation of ±5°C on the desired ambient temperature used for the thermoregulation calculation.
