12
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059705–00 REV. B
03
STEAM HEATING
EXAMPLE
To determine the ON cycle length, use the example values below:
•
Outdoor temperature = 30°F
•
Outdoor start = 55°F
•
Heat Adjustment = 7
1
Subtract the outdoor temperature from the Outdoor start (55–30 = 25°F).
2
Refer to Table 1 where the Heat Adjustment row ”7” intersects with the 25°F column. The Cycle-ON time is 14 minutes
(for a 60 minute cycle).
TABLE 1:
CYCLE LENGTH TABLE
*Heat Adjustment Setting—
See ”Heat Adjustment—Hot Water” on page 56
.
NOTE
For different cycle lengths based on the conditions of the above example, refer to the table below:
CYCLE LENGTH
DIVIDE BY
CYCLE-ON
20
3
5
30
2
7
90
2/3
21
OUTDOOR START MINUS OUTDOOR TEMPERATURE (ALL TEMPERATURES IN °F)
*
95
90
85
80
75
70
65
60
55
50
45
40
35
30
25
20
15
10
5
1
1
45
41
37
33
29
25
22
18
15
13
10
8
5
3
2
0
0
0
0
0
2
57
51
46
41
37
33
28
25
21
18
15
12
9
7
5
3
1
0
0
0
3
C
59
54
48
43
38
33
29
25
21
18
15
12
9
7
5
3
1
0
0
4
C
C
C
55
49
43
38
34
29
25
21
17
14
11
9
6
4
2
1
0
5
C
C
C
C
55
49
43
38
33
28
24
20
17
13
10
8
6
4
2
1
6
C
C
C
C
C
55
49
43
37
32
27
23
19
15
12
9
7
5
3
2
7
C
C
C
C
C
C
54
48
42
36
31
26
22
18
14
11
8
6
4
3
8
C
C
C
C
C
C
C
53
47
40
35
29
25
20
16
13
10
7
5
4
9
C
C
C
C
C
C
C
59
52
45
39
33
27
23
18
15
11
9
6
5
10
C
C
C
C
C
C
C
C
58
50
43
37
31
25
21
16
13
10
7
6
11
C
C
C
C
C
C
C
C
C
56
48
41
34
28
23
19
15
11
8
7
12
C
C
C
C
C
C
C
C
C
C
53
45
38
32
26
21
16
13
9
7
13
C
C
C
C
C
C
C
C
C
C
59
51
43
35
29
23
18
14
11
8
14
C
C
C
C
C
C
C
C
C
C
C
56
47
39
32
26
20
16
12
9
15
C
C
C
C
C
C
C
C
C
C
C
C
53
44
36
29
23
17
13
10
16
C
C
C
C
C
C
C
C
C
C
C
C
59
49
40
32
25
19
15
12
MINUTES ON (BASED ON 60 MINUTE CYCLE LENGTH)
C= CONTINUOUS OPERATION
