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7
Gas connections
Table 7A Natural Gas Pipe Size Chart
Capacity of Schedule 40 Metallic Pipe in Cubic Feet of Natural Gas Per Hour
(based on .60 specific gravity, 0.30" w.c. pressure drop)
Pipe
Size
10
20
(Inches)
1/2
131
90
3/4
273
188
1
514
353
1 1/4
1,060
726
1 1/2
1,580
1,090
2
3,050
2,090
2 1/2
4,860
3,340
3
8,580
5,900
4
17,500 12,000
AQUAS Fire Tube boilers are typically shipped ready to fire on natural gas. Check boiler rating plate to
⚠WARNING
determine which fuel the boiler is set for. If set to natural gas, it may be converted to LP by installing an LP
venturi (see page 13). In order to operate on LP gas, an LP venturi MUST BE installed. Failure to comply
could result in severe personal injury, death, or substantial property damage.
Check inlet gas supply
CSA or UL listed flexible gas connections
NOTICE
are acceptable, but you must exercise
caution to ensure that the line has adequate
capacity to allow your boiler to fire at full
rate. Consult with local codes for proper
installation or service procedures.
DO NOT adjust gas valve outlet pressure.
⚠WARNING
The gas valve is factory-set for the correct
outlet pressure. This setting is suitable
for natural gas and propane, requiring
no field adjustment.
alter the gas valve outlet pressure could
result in damage to the valve, causing
potential severe personal injury, death, or
substantial property damage.
The gas piping must be sized for the proper flow and length
of pipe, to avoid excessive pressure drop. Both the gas meter
and the gas regulator must be properly sized for the total gas
load.
If you experience a pressure drop greater than 1 inch w.c.,
the meter, regulator, or gas line is undersized or in need of
service. Perform the steps below when checking inlet gas
supply:
1.
Turn the main power switch to the "OFF" position.
2.
Shut off gas supply at the manual gas valve in the gas
piping to the appliance.
(continued)
Length of Pipe in Straight Feet
30
40
50
60
72
62
55
N/A
151
129
114
104
284
243
215
195
583
499
442
400
873
747
662
600
1,680
1,440
1,280
1,160
2,680
2,290
2,030
1,840
4,740
4,050
3,590
3,260
9,660
8,270
7,330
6,640
Attempting to
Installation & Operation Manual
70
80
90
100
N/A
N/A
N/A
N/A
95
89
83
79
179
167
157
148
368
343
322
304
552
514
482
455
1,060
989
928
877
1,690
1,580
1,480
1,400
3,000
2,790
2,610
2,470
6,110
5,680
5,330
5,040
3.
Loosen the set screw one (1) full turn from inside the
pressure tap on top of the gas valve. Place the tubing of
the manometer over the tap once the set screw is
loosened as shown in FIG. 7-3.
4.
Slowly turn on the gas supply at the field installed
manual gas valve.
5.
Turn the power switch to the "ON" position.
6.
Locate the pinhole button above the RESET button on
the display board (FIG. 11-1 on page 68). Insert a thin
wire (such as a paper clip) into the hole and press the
button once and hold for 5 seconds to place the boiler
into Service Mode. In Service Mode the boiler will fire at
ignition speed and will then modulate up to full fire.
7.
Observe the gas supply pressure as the burner fires at
100% of rated input. Percent of burner input will be
displayed on the control panel.
8.
Ensure inlet pressure is within specified range.
Minimum and maximum gas supply pressures are
specified in this section of the manual.
9.
If gas supply pressure is within normal range and no
adjustments are needed, proceed on to Step 11.
10. If the gas pressure is out of range, contact the gas utility,
gas supplier, qualified installer, or service agency to
determine the necessary steps to provide proper gas
pressure to the control.
11. Place the boiler back into normal operation by pressing
STOP.
125
150
175
200
N/A
N/A
N/A
N/A
70
63
58
N/A
131
119
109
102
269
244
224
209
403
366
336
313
777
704
648
602
1,240
1,120
1,030
960
2,190
1,980
1,820
1,700
4,460
4,050
3,720
3,460
45
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