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Page 10
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 19. 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
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
1.4
5.8
2.1
11.2
2.9
19.1
0.7
4.9
1.1
9.3
1.5
15.9
2.1
12.5
2.1
12.5
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
0.7
11.1
0.7
11.1
1.5
19.5
Adjustment Procedure
1.
Remote Temperature
Control for Heater
2.
3.
4.
5.
Main Circulating Loop
(With Own Pump)
Water Maintained
Less Than 110°F (43°C)
Water Temp
Rise
°
m
F
1.8
13
3.4
8
5.8
6
1.5
25
2.8
16
4.8
12
1.8
18
3.4
12
5.8
9
1.5
35
2.8
33
4.8
17
3.8
18
3.8
18
6.6
11
3.2
36
3.2
30
5.5
22
4.1
19
4.1
19
7.1
14
3.4
37
3.4
37
5.9
27
Turn on heater and open gate
valves A and B.
After 15 minutes, read T
.
1
If T
is less than 110°F (43°C),
1
slowly close valve B until T
climbs to 110°F (43°C).
If T
is greater than 110°F (43°C),
1
slowly close valve A until T
drops to 110°F (43°C).
Check after 5 minutes
operation and make final
adjustments.
°
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
1
1
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