Nor-Cal SDC15 Controller - Manual (Page 66)

• When using the Heat/Cool control (C26 = 1), the display and setting can be
made.
• When MV ≥ 50%, the control is changed to the PID (heat).
• When MV < 50%, the control is changed to the PID (cool).
• When the heat/cool change is set at “energy saving” (C27 = 1), the heat/cool
change is suppressed to indirectly obtain the energy saving effect. However,
when the heat/cool dead zone (C28) is less than 0.0%, the energy saving effect
cannot be obtained.
• How the relationship between the output (heat) and output (cool) is made for the
PID control result (MV) is set.
Constants oL and oH function as shown in the Figure below.
5-16
Chapter 5. DETAILED DESCRIPTION OF EACH FUNCTION
100.0%
0.0%
Heat MV
100.0%
Cool MV
0.0%
0.0% 50.0% 100.0% MV
100.0%
0.0%
Heat MV
100.0%
Cool MV
0.0%
0.0% 50.0%
Dead zone
Dead zone > 0.0% Dead zone = 0.0%
100.0% MV
100.0%
0.0%
Heat MV
100.0%
Cool MV
0.0%
0.0% 50.0%
Absolute value of
dead zone
Dead zone < 0.0%
100.0% MV
100%
100%
0%
Cool
MV
Heat
MV
MV
oH
(cool)
oL
(cool) oL
(heat)
oH
(heat)