Hitecsa EWNLM 115 Manual De Instalación, Funcionamiento Y Mantenimiento página 26

I.2.1 SET-POINT COMPENSATION
The Economy function enables the chiller assembly to operate energy-saving programmes whilst still providing the required level of comfort.
This function controls the maximum limit with sliding Set-point, modifying the Set-point value according to the actual system thermal load; when the load
decreases during summer months the Set-point increases, while when the load decreases during winter months the Set-Point decreases.
This function is destined for cooling applications, and is designed to control energy consumption while always respecting the real demands of the
system capacity. Within the Economy option it is possible to select one of three diverse Set-point adaptation curves depending on the type of system.
"Economy" function in Winter mode
y
S
L
M
H
x Load percentage (%)
y Set-point (°C).
S Value of Set-point set by user
L Use in buildings with very unbalanced loads.
M Intermediate situation between L and H (default).
Use in buildings with very similar loads.
H
High efficiency.
As an alternative to modification of the Set-point according to the real system load (Economy option), it is possible to compensate the set-point based on
the temperature of the outdoor air by purchasing the KEAP accessory.
This function modifies the Set-point value based on the temperature of the outdoor air. Based on this value, the set-point is calculated by adding (winter
cycle) or subtracting (summer cycle) an offset value to the Set-point set (see example below).
This function is activated both in winter mode as well as in summer mode. The function is activated only when a KEAP accessory is present.
Winter cycle
SC
OS
SI
It is possible to decide whether to activate the function in both functioning modes or only in one. If the Set-point compensation is enabled in relation to
the outdoor temperature, the Economy option is automatically disabled.
However, it is possible to decide to enable the set-point compensation in one cycle and enable the Economy function in the other cycle.
Precision
100%
RT
ST
OS = 7°C
RT = 25°C
ST = 20°C
T (°C) Outdoor air temperature
SC (°C) Calculated Set-point temperature
OS (°C) Set-point offset (calculated value)
SI (°C) Set-point set
RT (°C) Outdoor air temperature Set-point compensation
ST (°C) Outdoor temperature set
"Economy" function in Summer mode
y
H
M
L
Precision
S
x
x Load percentage (%)
y Set-point (°C).
S Value of Set-point set by user
L Use in buildings with very unbalanced loads.
M Intermediate situation between L and H (default).
Use in buildings with very similar loads.
H
High efficiency.
Summer cycle
SC
SI
OS
T
27
RT
ST
OS = 8°C
RT = 15°C
ST = 15°C
SECTION I: USER
100% x
T