Trane CVHE Troubleshooting Manual page 120

The following graph illustrates the reset functions of the above examples:
20
18
16
14
12
MR = 10.5
10
8
6
RR = .35
4
2
0
The following graph shows the reset function for Return CWR:
Reset Ratio
+50
+70
+30
_______________________
10 14
6
5.4 9 12.6
11.2
4.8 8
4.2 7 9.8
8.4
3.6 6
7
5
3
2.4 4 5.6
1.8
3
4.2
2
1.2 2.8
1 1.4
.6
0 0
0
Note: This graph assumes Maximum Reset is set to 20 degrees.
CVHE-SB-32A
Degrees of Reset vs Outdoor Air Temp
5.25
SR = 80
SR = 90
Outdoor Air Temp
Return CWR
+100
20
18
16
14
12
10
8
6
4
2
0
30 27 24
MR = 17
RR = -.7
7
21 18 15 12
TWE-TWL
Positive Reset Ratio
Negitive Reset Ratio
MR = Maximum Reset
SR = Start Reset (F)
RR = Reset Ratio
30 deg Start Reset
20 deg Start Reset
10 deg Start Reset
9 6 3 0
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