Hitachi YUTAKI S80 Series - Page 44

2. Features and benets
TCGB0075 rev.0 - 11/2012
44
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Three different possible water temperature set-point conguration modes for each zone
• OTC Points: Water target is selected by an Outside Temperature Compensated (OTC) control that is dened by 4
different points (Minimum and maximum water outlet temperature vs Minimum and maximum outdoor ambient tempe-
rature).
Outdoor ambient temperature (ºC)
Water temperature
set point ºC
(44) Tsh
n
h
(20) Tshr
n
l
Tah
n
l (-20)
Tah
n
h (20)
Water outlet temperature
set-point (ºC)
Outdoor ambient
temperature(ºC)
Temperature setting at low
ambient temperature
Temperature setting at high
ambient temperature
Low ambient
temperature
High ambient
temperature
• OTC Gradient (Only for heating space): Water target is selected by an Outside Temperature Compensated (OTC)
control that is dened by a different gradient of the curve. The initial point of the curve is always 20ºC-20ºC (Water
outlet target 20ºC at outdoor ambient temperature of 20ºC).
Water outlet temperature set-point (ºC)
Outdoor ambient temperature (ºC)
• Fixed temperature: Water target value is dened by a xed temperature set by the user.
Outdoor ambient temperature (ºC)
Water temperature
set point ºC
Tf
n
Water outlet temperature
set-point (ºC)
Outdoor ambient
temperature(ºC)
Fixed water outlet
temperature setting