RHOSS TCHEY 105 Mode D'emploi page 24

I.2.1 SET-POINT COMPENSATION
The Ec onomy function enables the c hiller assembly to operate energy-savi ng programmes whilst still providing the r equired level of comfort.
This func tion controls the maxi mum limit with sliding Set-poi nt , modifying the Set-point value acc ording to the actual s ystem ther mal load; when the l oad
decreas es during summer months the Set-point increases, while when the load decreas es during wi nter months the Set-Poi nt decreas es.
This func tion is des tined for cooling applications , and is designed to control energy consumption while al ways respecting the real demands of the
system capacity. Withi n the Ec onomy option it is possible to s elect one of three di verse Set- point adaptati on c urves depending on the type of s ys tem.
"Econom y" function in W inter mode
y
S
L
M
H
Load percentage (%)
x
Set-point (°C)
y
Value of Set-point set by user
S
Use in buildings with very unbal anced loads.
L
Inter mediate situation between L and H ( default).
M
Use in buildings with very si milar loads.
H
High efficienc y.
As an alternati ve to modification of the Set-poi nt according to the real s ystem l oad (Economy option), it is possible to compensate the set-point based on
the temperature of the outdoor air by purchasing the KEAP access ory.
This func tion modifies the Set-point value bas ed on the temperature of the outdoor air. Bas ed on this val ue, the set-point is calcul ated by adding (winter
cycle) or subtracting (summer c ycle) an offset value to the Set-point s et (see example bel ow).
This func tion is acti vated both in winter mode as well as in summer mode. T he func tion is acti vated only when a KEAP access ory is present.
W inter cycle
SC
OS
SI
It is possible to decide whether to acti vate the function in both functi oning modes or only in one. If the Set-poi nt compens ation is enabled in rel ati on to
the outdoor temperature, the Economy opti on is automaticall y disabled.
However, it is possibl e to decide to enable the set-point compens ation in one c ycle and enable the Economy functi on i n the other c ycle.
Precision
100%
RT
ST
OS = 8°C
RT = 25°C
ST = 20°C
T (°C) Outdoor air temper ature
SC (°C) Calculated Set-point temperature
OS (°C) Offset Set-point (calculated value)
SI (°C) Set-point s et
RT (°C) Outdoor air temper ature Set-point compens ation
ST (°C) Outdoor temperature s et
"Econom y" function in Summer mode
y
H
M
L
Precision
S
x
Load percentage (%)
x
Set-point (°C)
y
Value of Set-point set by user
S
Use in buildings with very unbal anced loads.
L
Inter mediate situation between L and H ( default).
M
Use in buildings with very si milar loads.
H
High efficienc y.
Summer cycle
SC
SI
OS
T
24
RT
ST
OS = 8°C
RT = 15°C
ST = 15°C
SECTION I: USER
100%
x
T