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When a boiler is connected to heating coils located in air handling units (where they may be exposed to
refrigerated air circulation), the boiler piping system shall be equipped with a flow control valve or other
automatic means to prevent gravity circulation of chilled water through the boiler. Chilled water in the boiler
will create condensate on the boiler tubes, which will collect in the combustion chamber causing corrosion.
10.
PIPING OF BOILER TO SYSTEM (FIG.4)
Check all applicable local heating, plumbing and building safety codes before proceeding.
Be sure to provide unions and gate valves at inlet and outlet to boiler so that it can be easily isolated for
service.
This boiler is of a low mass design, which provides for instant heat transfer. Special attention to water flow
rates will ensure that temperature rise does not exceed 35°F (19.4°C). The following Table 3 is provided
as a guide.
For application in areas known to have hard water conditions, contact factory for recommendations.
Head Loss and Flow Vs Temperature Rise
Model
60
100
150
200
250
300
400
500
600
Figure 3
10 °F
USGPM
∆P ft.
USGPM
10.2
0.03
17.0
0.07
25.5
0.20
34.0
0.40
42.5
0.65
51.0
1.50
68.0
2.00
85.0
3.00
102.0
4.30
Table 3
20 °F
∆P ft.
USGPM
5.1
0.01
8.5
0.02
12.8
0.04
17.0
0.08
21.3
0.16
25.5
0.49
34.0
0.55
42.5
0.76
51.0
1.15
14
30 °F
∆P ft.
3.4
0.005
5.7
0.010
8.5
0.030
11.3
0.050
14.2
0.100
17.0
0.190
22.7
0.260
28.3
0.390
34.0
0.550
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