Watlow CPC400 - Manual (Page 84)

Chapter 3: Operation and Setup CPC400 Series User’s Guide
70 Watlow Anafaze Doc. 0600-2900-2000
• If the primary loop has both heat and cool outputs,
then the set point of the secondary loop is equal to the
Cascade low SP parameter when the cool output is at
100 percent, and is equal to the Cascade high SP when
the heat output is at 100 percent. See Figure 3.9.
• If the primary loop has only a heat output, then the set
point of the secondary loop is equal to the Cascade low
SP parameter when the heat output is at 0 percent,
and is equal to the Cascade high SP parameter when
the heat output is at 100 percent. See Figure 3.10.
• If the primary loop has only a cool output, then the set
point of the secondary loop is equal to the Cascade low
SP parameter when the cool output is at 100 percent,
and is equal to the Cascade high SP parameter when
the cool output is at 0 percent.
Figure 3.9 Secondary Set Point When Primary
Loop Has Heat and Cool Outputs
Figure 3.10 Secondary Set Point When Primary
Loop Has Heat Output Only
Set P
oint of Secondar
y Loop
(Engineer
ing Units)
High Set Point
Low Set Point
-100%
Output of Primary Loop (Percent of Full Scale)
100%
Set P
oint of the Secondar
y Loop
(Engineer
ing Units)
High Set Point
Low Set Point
0%
Output of Primary Loop (Percent of Full Scale)
100%