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5
DIAL SETTINGS CONT.
D. ADDITIONAL INFORMATION:
Charts 1, 2, and 3 show the effect which dial settings have
upon boiler water temperature under varying outside air
temperatures. Some examples of how these charts may be
used are as follows:
Example 1 (See Chart 1) – To determine boiler water tempera-
ture for 10° outside air temperature and a #3 square dial
setting, move up on 10° line until it intersects the heavy line
for a #3 square dial setting. Then move horizontally to left
and read water temperature of 150°.
Example 2 (See Chart 1) – To determine square dial setting for
desired boiler water temperature of 210° at -20° outside
temperature, move up on -20° line to 210°. Since the heavy
line for a #4 square dial setting intersects at this point, the
square dial should be set at 4.
Example 3 – Note the effect of changing setting of the round dial
from “N” (Chart 1) to 4 divisions “warmer” than “N” (Chart 3).
Water temperature has been increased 20° for all outside
temperatures.
-20
-29
-10
-23
0
-17
10
-12
20
-7
30
-1
40
4
50
10
60
16
70°F
21°C
(27) 80
°C °F
(38) 100
(49) 120
(60) 140
(71) 160
(82) 180
(93) 200
(104) 220
(116) 240
5
4
3
2
1
N
1
2
3
4
5
Chart 1 — Round Dial Set at “N”
-20
-29
-10
-23
0
-17
10
-12
20
-7
30
-1
40
4
50
10
60
16
70°F
21°C
(27) 80
°C °F
(38) 100
(49) 120
(60) 140
(71) 160
(82) 180
(93) 200
(104) 220
(116) 240
1
2
3
4
5
N
5
4
3
2
1
-20
-29
-10
-23
0
-17
10
-12
20
-7
30
-1
40
4
50
10
60
16
70°F
21°C
(27) 80
°C °F
(38) 100
(49) 120
(60) 140
(71) 160
(82) 180
(93) 200
(104) 220
(116) 240
5
4
3
2
1
N
1
2
3
4
5
(127) 260
Chart 2 — Round Dial Set 2
divisions “COOLER” than “N”.
Chart 3 — Round Dial Set 4
divisions “WARMER” than “N”.