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Page 12
Heat
Exch.
Model
Passes
175
2
4
250
2
4
325
2
4
400
2
4
*Pressure drop includes head loss of heat exchanger and through 30 feet (9.1 m) of pipe and normal fittings when heater
is installed with storage tank. Pipe and fittings are assumed to be 1-1/2 inch (38 mm).
Heater
Figure 20. Cold water application.
Water
Category
gpm
Soft
22
Normal
34
Hard
46
Soft
11
Normal
17
Hard
23
Soft
22
Normal
34
Hard
46
Soft
11
Normal
17
Hard
23
Soft
34
Normal
34
Hard
46
Soft
17
Normal
17
Hard
23
Soft
34
Normal
34
Hard
46
Soft
17
Normal
17
Hard
23
Table 4. Pump Performance Requirements.
To
Drain
T
1
A
Flow
Pressure*
Rate
Drop
L/s
ft.
1.4
5.8
2.1
11.2
2.9
19.1
0.7
4.9
1.1
9.3
1.5
15.9
5.8
1.4
2.1
11.2
2.9
19.1
0.7
4.9
1.1
9.3
1.5
15.9
2.1
12.5
12.5
2.1
2.9
21.7
0.7
10.4
0.7
10.4
1.5
18.1
2.1
13.3
2.1
13.3
2.9
23.4
11.1
0.7
0.7
11.1
1.5
19.5
Adjustment Procedure
1. Turn on heater and open gate
Remote Temperature
valves A and B.
Control for Heater
2. After 15 minutes, read T
3. If T
slowly close valve B until T
climbs to 110°F (43°C).
4. If T
slowly close valve A until T
B
drops to 110°F (43°C).
5. Check after 5 minutes
operation and make final
adjustments.
Main Circulating Loop
(With Own Pump)
Water Maintained
Less Than 110°F (43°C)
BRADFORD WHITE
Water Temp
Rise
°
m
F
1.8
13
3.4
8
5.8
6
1.5
25
2.8
16
4.8
12
18
1.8
3.4
12
5.8
9
1.5
35
2.8
33
4.8
17
3.8
18
18
3.8
6.6
11
3.2
36
3.2
30
5.5
22
4.1
19
4.1
19
7.1
14
37
3.4
3.4
37
5.9
27
.
1
is less than 110°F (43°C),
1
1
is greater than 110°F (43°C),
1
1
°
C
7
4
3
14
9
7
10
7
5
19
18
9
10
10
6
20
17
12
11
11
8
21
21
15
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