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

Temperature modulated with electronic ignition - normal duty suitable for recirculating potable water only
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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
13

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