351579-YTS-B-0608
24
Johnson Controls Unitary Products
Table 8: Modulating Gas Heat
Stages of Gas Control (% of Full Heat Output)
Gas Valve Signal for High and Low Fire
Gas Heat
Module
Step
Input
Output
% of Total
Output
LF1
HF1
LF2
HF2
1
1
69,333
55,466
26%
Off
Off
On
Off
2
106,666
85,333
40%
Off
Off
On
On
3
165,332
132,266
62%
On
Off
On
Off
4
202,665
162,132
76%
On
Off
On
On
5
229,332
183,466
86%
On
On
On
Off
6
266,666
213,333
100%
On
On
On
On
Gas Heat
Module
Step
Input
Output
% of Total
Output
LF1
HF1
LF2
HF2
LF3
HF3
2
1
69,333
55,466
13%
Off
Off
On
Off
Off
Off
2
106,666
85,333
20%
Off
Off
On
On
Off
Off
3
165,332
132,266
31%
On
Off
On
Off
Off
Off
4
202,665
162,132
38%
On
Off
On
On
Off
Off
5
229,332
183,466
43%
On
On
On
Off
Off
Off
6
266,666
213,333
50%
On
On
On
On
Off
Off
7
325,331
260,265
61%
On
Off
On
Off
On
Off
8
362,664
290,132
68%
On
Off
Off
Off
On
On
9
389,331
311,465
73%
On
On
On
Off
On
Off
10
426,664
341,331
80%
On
On
On
On
On
Off
11
495,997
396,798
93%
On
On
On
Off
On
On
12
533,330
426,664
100%
On
On
On
On
On
On
Gas Heat
Module
Step
Input
Output
% of Total
Output
LF1
HF1
LF2
HF2
LF3
HF3
LF4
HF4
3
1
69,333
55,466
9%
Off
Off
On
Off
Off
Off
Off
Off
2
106,666
85,333
13%
Off
Off
On
On
Off
Off
Off
Off
3
165,332
132,266
21%
On
Off
On
Off
Off
Off
Off
Off
4
202,665
162,132
25%
On
Off
On
On
Off
Off
Off
Off
5
229,332
183,466
29%
On
On
On
Off
Off
Off
Off
Off
6
266,666
213,333
33%
On
On
On
On
Off
Off
Off
Off
7
325,331
260,265
41%
On
Off
On
Off
On
Off
Off
Off
8
362,664
290,132
45%
On
Off
Off
Off
On
On
Off
Off
9
389,331
311,465
49%
On
On
On
Off
On
Off
Off
Off
10
426,664
341,331
53%
On
On
On
On
On
Off
Off
Off
11
495,997
396,798
62%
On
On
On
Off
On
On
Off
Off
12
533,330
426,664
67%
On
On
On
On
On
On
Off
Off
13
586,663
469,330
73%
On
On
On
On
On
Off
On
Off
14
655,996
524,797
82%
On
On
On
Off
On
On
On
Off
15
693,329
554,663
87%
On
On
On
On
On
On
On
Off
16
762,662
610,130
95%
On
On
On
Off
On
On
On
On
17
799,995
639,996
100%
On
On
On
On
On
On
On
On
