Bosch Pro Tankless GWH-450-ES Series Manual page 13

Restrictor definition
Use table below to define which restrictor to be used.
Total equivalent
length (ft)
18 -28
28 -40
40 -65
65 -100
18 -28
28 -50
50 -75
75 -100
Table 4 Restrictors
Selecting a restrictor (sample)
Described example was done taking as
i
example Fig. 15.
Use table below to define which restrictor to be used.
Part 3 feet
Number of
parts
Equivalent
length/part
Total equivalent
length/part
Number of
parts
Equivalent
length/part
Total equivalent
length/part
Part 4 feet
Number of
parts
Equivalent
length/part
Total equivalent
length/part
Table 5 Selecting a restrictor
In above example, total equivalent length is 63 feets.
Using table 4 we conclude that the restrictor to be used
is:
• GWH450ES NG - restrictor 50
• GWH450ES LPG - restrictor 55.
6 720 607 915
Restrictor
Ø
44
47
50
55
47
50
55
60
1 foot 90°
10 ----- 1
3.0 1.0 6.0
30.0 ----- 6.0
6 ----- 1
1.5 0.5 3.0
9.0 ----- 3.0
1 foot 90°
----- ----- -----
2.0 0.5 1.0
----- ----- -----
Total equivalent
45° out/in
length
----- 1
3.0 12.0 48.0
----- 12.0
----- 1
1.5 3.0 15.0
----- 3.0
----- -----
----- -----
----- -----
----- -----
Total:
Above table should be used to define the
i
correct restrictor for each type of
installation.
Installation instructions
0
63
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