Download  Print this page

Bosch Model GWH 425 User Manual page 12

Indoor model flow modulated with standing pilot suitable for heating potable water only -
Hide thumbs

Advertisement

Installation instructions
FOR NATURAL GAS
Maximum Capacity of pipe in Cubic Feet of Gas per Hour for Gas Pressure of 0.5 Psig or less and a Pressure drop
of 0.3 in Water Column (0.75mbar).(Based on a 0.60 Specific Gravity Gas) Btu numbers given in thousands.
Copper tubing is prohibited for use with Natural Gas in the Commonwealth of Massachusetts and not recommended
elsewhere.
Follow boxed numbers for piping just one GWH 425 PN (example: ¾" B.I. Natural Gas pipe for 20 ft (6. 1 m). will
handle 190,000 btu's (55.7 kWh). For multiple appliances combine the total btu input load and then refer to
applicable chart below.
Nominal
Iron
Pipe
Internal
Size
Diameter
inches
inches
10
20
3/4
0.824
278
190
1
1.049
520
350
1 1/4
1.380
1050 730
Length of Flexible Corrugated Stainless Steel Tubing (CSST), Feet
Tube
size,
inches
EHD*
10
20
30
1/2
18 EHD 82
58
47
3/4
23 EHD 161 116
96
1
30 EHD 330 231
188
1 1/4
37 EHD 639 456
374
FOR LP GAS
Maximum Capacity of Pipe in Thousands of BTU per Hour of Undiluted Petroleum Gases (at 11 inches Water Column Inlet
Pressure) (Based on a Pressure Drop of 0.5 Inch Water Column).
N o m ina l
Iro n pipe
s ize
10
20
30
inc he s
1/2
291 200 160 137 122 110 94
3/4
608 418 336 287 255 231 197 175
1
1145 787 632 541 480 434 372 330
Maximum Capacity of Semi-Rigid copper Tubing in
Thousands of BTU per Hour of Undiluted Liquefied
Petroleum Gases (at 11 inches Water Column Inlet
Pressure).
(Based on a Pressure Drop of 0.5 Inch Water Column)
* Source National Fuel Gas Code NFPA 54, ANSI Z223. 1
- No Additional Allowance is necessary for an ordinary
number of fittings
Fig. 14
12
Length of Black Iron Pipe, Feet
30
40
50
60
70
152
130
115
105
96
285
245
215
195
180
590
500
440
400
370
40
50
60
41
37
34
83
75
68
* EHD = Equivalent Hydraulic Diameter. The greater the
162
144
131
value of EHD, the greater the gas capacity of the tubing
325
292
267
Black Iron Pipe
Lenght of pipe, Feet
40
50
60
80
100
125
84
74
155
292
80
90
100
125
150
90
84
79
72
170
160
150
130
120
350
320
305
275
250
* EHD = Equivalent Hydraulic Diameter. The greater the
value of EHD, the greater the gas capacity of the tubing.
Length of Flexible Corrugated Stainless Steel Tubing (CSST), Feet
Tube
size
inches
EHD*
150
200
1/2
18 EHD 129 91
67
58
140
120
3/4
23 EHD 254 183
265
227
1
30 EHD 521 365
1 1/4
37 EHD 971 661
Outside
diameter
Inch
10
20
3/8
39
26
1/2
92
62
5/8
199 131 107
3/4
329 216 181 145 131 121 112 104
175
200
64
59
55
110
100
225
210
.
10
20
30
40
50
74
64
58
151
131
118 107
297
256
227 207
528
449
397 359
Copper (LP gas only)
Length of Tubing, Feet
30
40
50
60
70
80
21
19
_
_
_
50
41
37
35
31
29
90
79
72
67
62
60
53
90
100
_
_
_
27
26
59
55
95
90
6 720 608 034

Advertisement

loading

  Related Manuals for Bosch Model GWH 425

This manual is also suitable for:

Protankless gwh-425-pn-nProtankless gwh-425-pn-l