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4)
Add the total equivalent length of the elbows determined in step 3 to the to the total straight pipe length
determined in Step 2. The result is the total equivalent length.
5)
Refer to Table 5.2, 5.3, or 5.5 as appropriate for the type of Bimini Buddy being installed. Verify that the
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
BWC070
BWC090
BWC120
BWC120
BWC120
BWC151
BWC151
BWC151
Table 5.3: BB100I (IWH) Maximum Equivalent Boiler/IWH Loop Length
Boiler
Model
Circulator
BWC070
Taco 008
BWC090
Taco 0014
BWC120
Taco 0014
BWC151
Taco 0014
Notes:
1.
"Class A" models shown in Table 5.4 may not achieve claimed first hour rating due to inadequate boiler water flow.
2.
MS-79 will not achieve claimed first hour rating due to inadequate boiler output.
3.
Some models shown in Table 5.4 have 3/4" boiler connections. These must be increased to 1" directly at the indirect
water heater connection.
Indirect
Water
Heater
Flow Rate
Class
(GPM)
6.0
A
7.5
8.0
B
8.0
Circulator
Flow Rate
(GPM)
Taco 008
6.0
Taco 0014
8.0
Taco 0014
8.0
Taco 0014
9.0
Taco 0013
12.0
Taco 0014
8.0
Taco 0014
11.0
Taco 0013
14.0
CH Mode
Flow
Max.
Flow
Rate
Boiler
Rate
(GPM)
Temp
(GPM)
Rise (F)
6.25
20
6.0
8.0
20
7.5
8.75
26
8.0
9.25
29
8.0
Table 5.4: Crown Indirect Water Heaters
Max. IWH
Pressure
Drop (ft wc)
1.7
MS-26, MS-40, MSH-40, MT040GBR, MT050GBR, MT050GBR,
2.6
MT065GBR, MT080GBR
3.0
5.0
MS-40, MS-53, MS-79, MSH-53
Max. Boiler Temp
Pipe
Rise (F)
Size
21
1"
20
1"
27
1"
24
1"
18
1"
34
1"
25
1"
19
1"
DHW Mode
Max. IWH
Indirect
Pressure
Water Heater
Drop (ft
Class in
wc)
Table 5.4
1.7
A
2.6
A
3.0
A
5.0
B
Crown Indirect Water Heater Models
10
Max Equivalent Length of
Shaded Piping in Figure 5.6
179
121
152
80
37
92
54
45
Max
Note
Equivalent
Length of
Pipe
Shaded Piping
Size
in Figure 5.7
1
1"
79
1
1"
55
1"
37
2
1"
79
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