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
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