Modine HD Serie Manuel D'installation Et D'entretien page 15

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InsTAllATIon - gAs ConneCTIons
IMPORTANT
To prevent premature heat exchanger failure, the input to the
appliance, as indicated on the serial plate, must not exceed
the rated input by more than 5%.
1. Installation of piping must conform with local building codes,
or in the absence of local codes, with the National Fuel Gas
Code, ANSI Z223.1 (NFPA 54) - latest Edition. In Canada,
installation must be in accordance with CSA-B149.1.
2.
Piping to units should conform with local and national
requirements for type and volume of gas handled, and
pressure drop allowed in the line.Refer to Table 15.1 to
determine the cubic feet per hour (CFH) for the type of gas
and size of unit to be installed. Using this CFH value and the
length of pipe necessary, determine the pipe diameter from
Table 15.2. Where several units are served by the same
main, the total capacity, CFH and length of main must be
considered. Avoid pipe sizes smaller than 1/2". Table 15.2
allows for a 0.3" W.C. pressure drop in the supply pressure
from the building main to the unit. The inlet pressure to the
unit must be 6-7" W.C. for natural gas and 11-14" W.C. for
propane gas. When sizing the inlet gas pipe diameter, make
sure that the unit supply pressure can be met after the 0.3"
W.C. has been subtracted. If the 0.3" W.C. pressure drop
is too high, refer to the Gas Engineer's Handbook for other
gas pipe capacities.
3.
Install a ground joint union with brass seat and a manual
shut-off valve adjacent to the unit for emergency shut-
off and easy servicing of controls, including a 1/8" NPT
plugged tapping accessible for test gauge connection (See
Figure 15.1).
4.
Provide a sediment trap before each unit in the line where
low spots cannot be avoided. (See Figure 15.1).
5.
When Pressure/Leak testing, pressures above 14" W.C.
(1/2 psi), close the field installed shut-off valve, disconnect
the appliance and its combination gas control from the gas
supply line, and plug the supply line before testing. When
testing pressures 14" W.C. (1/2 psi) or below, close the
manual shut-off valve on the appliance before testing.
Table 15.2
gas pipe Capacities
gas pipe Capacities (up to 14" W.C. gas pressure through schedule 40 pipe)
length
of pipe
1/2"
(feet)
Natural
Propane
10
132
83
20
92
58
30
73
46
40
63
40
50
56
35
60
50
32
70
46
29
80
43
27
100
38
24
125
34
21
150
31
20
Cubic feet per Hour with pressure drop of 0.3" W.C.
natural gas - specific gravity - 0.0
propane gas - specific gravity - 1.50
3/4"
Natural
Propane
Natural
278
175
520
190
120
350
152
96
285
130
82
245
115
82
215
105
66
195
96
60
180
90
57
170
79
50
150
72
45
130
64
40
120
figure 15.1
recommended sediment Trap/manual shut-off valve
Installation - side or Bottom gas Connection
SUPPLY LINE
GAS
SUPPLY LINE
3"
MIN.
Manual shut-off valve is in the "OFF" position when handle is perpendicular to pipe.
Table 15.1 manifold pressure & gas Consumption
model
BTu/Cu. ft.
size
specific gravity
manifold pressure In. W.C.
CFH
Gal/Hr. Propane
30
Sec/cu. ft.
Orifice Drill Size
CFH
Gal/Hr. Propane
45
Sec/cu. ft.
Orifice Drill Size
CFH
Gal/Hr. Propane
0
Sec/cu. ft.
Orifice Drill Size
CFH
Gal/Hr. Propane
75
Sec/cu. ft.
Orifice Drill Size
CFH
Gal/Hr.Propane
100
Sec/cu.ft.
Orifice Drill Size
CFH
Gal/Hr.Propane
125
Sec/cu.ft.
Orifice Drill Size
pipe diameter
1"
1-1/4"
Propane
Natural
Propane
328
1050
662
221
730
460
180
590
372
154
500
315
135
440
277
123
400
252
113
370
233
107
350
221
95
305
192
82
275
173
76
250
158
6-583.2
GAS
GROUND
MANUAL
JOINT
SHUT-OFF
UNION
VALVE
CONTROLS
PLUGGED
1/8" NPT TEST
GAGE CONNECTION
SEDIMENT
TRAP
natural
propane
1050
2500
no. of
0.0
1.53
orifices
3.5
10.0
28.6
12.0
.33
126
300
49
56
42.9
18.0
.50
84
200
49
56
57.1
24.0
.66
63
150
49
56
71.4
30.0
.83
50
180
49
56
95.2
40
1.09
38
90
45
55
119
50
1.37
30
72
42
53
1-1/2"
Natural
Propane
Natural
1600
1008
3050
1100
693
2100
890
561
1650
760
479
1450
670
422
1270
610
384
1150
560
353
1050
530
334
930
460
290
870
410
258
780
380
239
710
TO
2
3
4
5
5
5
2"
Propane
1922
1323
1040
914
800
725
662
586
548
491
447
15

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