35
HEAT REQUEST FROM THERMOSTAT or POR
(Programmable Timer)
In this case the outlet setpoint depends on the outdoor
temperature for obtaining a reference ambient temperature of
20°C. There are 2 parameters that compete to calculate the
output setpoint:
-
slope of the compensation curve (KT)
-
offset on the reference ambient temperature.
SELECTING THE COMPENSATION CURVE
The compensation curve for heating maintains a theoretical
temperature of 20°C indoors, when the outdoor temperature
is b20°C and -20°C. The choice of the curve
depends on the minimum outdoor temperature envisaged
(and therefore on the geographical location), and on the
delivery temperature envisaged (and therefore on the type of
system). It is carefully calculated by the installer on the basis
of the following formula:
KT = T. outlet envisaged - Tshift
20- min. design external T
Tshift = 30°C standard system
25°C
floor installations
If the calculation produces an intermediate value between two
curves, you are advised to choose the compensation curve
nearest the value obtained.
Example: if the value obtained from the calculation is 1.3, this
is between curve 1 and curve 1.5. Choose the nearest curve,
i.e. 1.5.
The settable KT values are as follows:
radiator system: 1.0-3.0
under floor heating system 0.2-0.8.
Using the REC10CH it is possible to set the selected
thermoregulation curve:
- select TECHNICAL
WEATHER COMPENSATION
CLIMATIC CURVES
-
select the heating zone and set the climatic curve.
OFFSET ON THE REFERENCE AMBIENT TEMPERATURE
In any event, the user can indirectly modify the value of
the HEATING setpoint inserting an offset on the reference
temperature that can vary within the range -5-+5 (offset 0 =
20°C).
NIGHT COMPENSATION
Whenever a programmable timer is connected to the
ROOM THERMOSTAT input, the NIGHT COMPENSATION
function can be enabled as follows: TECHNICAL menu
WEATHER COMPENSATION
CLIMATIC CURVES
MAIN.
In this case, when the CONTACT is CLOSED, the heat
request is made by the flow sensor, on the basis of the outdoor
temperature, to obtain a nominal ambient temperature on DAY
level (20°C).
The opening of the contact does not produce a switch-off, but
a reduction (parallel translation) of the climatic curve on NIGHT
level (16°C). Also in this case, the user can indirectly modify
the value of the HEATING setpoint inserting once again an
offset on the reference DAY temperature (20°C) rather than
NIGHT (16°C) that can vary within the range [-5 - +5].
PARALLEL NIGHT-TIME REDUCTION
DELIVER
Y TEMPERA
TURE
(°C)
OUTSIDE TEMPERATURE (°C)
Riduzione notturna P ARALLELA
10
20
30
40
50
60
70
80
90
-20
-15
-10
-5
0
5
10
15
20
Te mperatura Esterna
Te
mperatura di
Curva climatica GIORNO
C urva climatica NOTTE
16 °C
20 °C
DAY
temperature
curve
NIGHT
temperature
curve
DELIVER
Y TEMPERA
TURE
(°C)
OUTSIDE TEMPERATURE (°C)
WEATHER COMPENSATION CURVE
20 °C
25 ° C
15 °C
10
20
30
40
50
60
70
80
90
-20
-15
-10
-5
0
5
10
15
20
25
30
THERMOREGULATION CURVES
OUTSIDE TEMPERATURE (°C)
DELIVERY TEMPERATURE (°C)
20
30
40
50
60
70
80
90
100
-20
0,2
0,4
0,6
0,8
1,0
1,5
2,0
2,5
3,0
T HT
T LT
-15
-10
-5
0
5
10
15
20
T HT
std systems heating temperature set point (jumper
pos.1 not inserted)
T LT
floor systems heating temperature set point (jumper
pos.1 inserted)
6.3 FIRST COMMISSIONING
-
Carry out the procedure as detailed in “6.1 Preliminary
checks”.
- Ensure that all services (gas, water, electricity) are supplied
and turned ON at the appliance.
- Ensure that the appliance has been set to HEATING AND
HOT WATER (WINTER - access via STATE menu).
- Ensure that any time control and/or temperature control is
calling for heat.
OFF
HOT WATER ONLY
HEATING AND HOT WATER
BOILER
BOILER
MAIN ZONE
STATE
42
°C
MENU
STATE
SET
INFO
HOT WATER TEMPERATURE
FRI
1.3
bar
09/04/2021
12:17
PLANT
-
When any heat request is generated and the burner is lit,
the “ ” icon appears on the display. The boiler will start
up and continue working until the set temperatures are
reached, after which it will then go back to standby.
VENT CYCLE FUNCTION
b
When the appliance is switched on for the first time or
whenever the electrical supply has been switched off
and then restored, an automatic vent cycle is carried out
lasting 6 min. When the vent cycle is in progress, all heat
requests are paused except for domestic hot water ones
when the boiler is not set to OFF, and a sliding message
at the foot of the page appears on the main page of the
REC10. In this condition the green and red LEDs are
alternately displayed every 0.5 second.
