Crown Boiler BB100H User Manual
Page 12
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Add the total equivalent length of the elbows determined in step 3 to the to the total straight pipe length
4)
determined in Step 2. The result is the total equivalent length.
Refer to Table 5.2, 5.3, or 5.5 as appropriate for the type of Bimini Buddy being installed. Verify that the
5)
equivalent length calculated in Step 4 is less than that shown for the combination of boiler, circulator, and
indirect water heater (BB100I only) being installed. In the case of the BB100I, the pressure drop through the
indirect water heater must be considered. The indirect water heater being used must have a pressure drop less
than that shown in Table 5.3 at the DHW flow rate shown to work reliably with the BB100I. Table 5.4 shows
the pressure drop and flow information for Crown indirect water heaters. These are grouped by “class” and that
class is shown in Table 5.4.
Table 5.2: BB100H (Heat Only) Maximum Equivalent Boiler Loop Length
Boiler Model
Circulator
Flow Rate
(GPM)
Max. Boiler Temp
Rise (F)
Pipe
Size
Max Equivalent Length of
Shaded Piping in Figure 5.6
BWC070
Taco 008
6.0
21
1”
179
BWC090
Taco 0014
8.0
20
1”
121
BWC120
Taco 0014
8.0
27
1”
152
BWC120
Taco 0014
9.0
24
1”
80
BWC120
Taco 0013
12.0
18
1”
37
BWC151
Taco 0014
8.0
34
1”
92
BWC151
Taco 0014
11.0
25
1”
54
BWC151
Taco 0013
14.0
19
1”
45
Table 5.3: BB100I (IWH) Maximum Equivalent Boiler/IWH Loop Length
Boiler
Model
Circulator
CH Mode
DHW Mode
Pipe
Size
Max
Equivalent
Length of
Shaded Piping
in Figure 5.7
Flow
Rate
(GPM)
Max.
Boiler
Temp
Rise (F)
Flow
Rate
(GPM)
Max. IWH
Pressure
Drop (ft
wc)
Indirect
Water Heater
Class in
Table 5.4
Note
BWC070
Taco 008
6.25
20
6.0
1.7
A
1
1”
79
BWC090
Taco 0014
8.0
20
7.5
2.6
A
1
1”
55
BWC120
Taco 0014
8.75
26
8.0
3.0
A
1”
37
BWC151
Taco 0014
9.25
29
8.0
5.0
B
2
1”
79
Notes:
“Class A” models shown in Table 5.4 may not achieve claimed first hour rating due to inadequate boiler water flow.
1.
MS-79 will not achieve claimed first hour rating due to inadequate boiler output.
2.
Some models shown in Table 5.4 have 3/4” boiler connections. These must be increased to 1” directly at the indirect
3.
water heater connection.
Table 5.4: Crown Indirect Water Heaters
Indirect
Water
Heater
Class
Flow Rate
(GPM)
Max. IWH
Pressure
Drop (ft wc)
Crown Indirect Water Heater Models
A
6.0
7.5
8.0
1.7
2.6
3.0
MS-26, MS-40, MSH-40, MT040GBR, MT050GBR, MT050GBR,
MT065GBR, MT080GBR
B
8.0
5.0
MS-40, MS-53, MS-79, MSH-53