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InsTAllATIon - gAs ConneCTIons
gAs ConneCTIons
WARNING
1. Installation 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. All field gas piping must be pressure/leak tested prior to
operation. Never use an open flame. Use a soap solution
or equivalent for testing.
3. Gas pressure to appliance controls must never exceed
14" W.C. (1/2 psi).
4. To reduce the opportunity for condensation, the minimum
sea level input to the appliance, as indicated on the serial
plate, must not be less than 5% below the rated input, or
5% below the minimum rated input of dual rated units.
CAUTION
1. Purging of air from gas lines should be performed as
described in the National Fuel Gas Code, ANSI Z223.1
(NFPA 54) - latest edition, or in Canada CSA-B149 codes.
2. When leak testing the gas supply piping system, the
appliance and its combination gas control must be isolated
during any pressure testing in excess of 14" W.C. (1/2 psi).
3. The unit should be isolated from the gas supply piping
system by closing its field installed manual shut-off
valve.This manual shut-off valve should be located within
6' of the heater.
4. Turn off all gas before installing appliance.
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 14.1 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 14.2. 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 14.2
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 14.1).
4. Use 2 wrenches when connecting field piping to units.
5. Provide a sediment trap before each unit in the line where
low spots cannot be avoided. (see Figure 14.1).
6. When pressure/leak testing, pressures above 11" 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.
14
figure 14.1 - recommended sediment Trap/manual
shut-off valve Installation - side or Bottom gas
Connection
➀
GAS
SUPPLY LINE
GROUND
MANUAL
SHUT-OFF
VALVE
GAS
SUPPLY LINE
PLUGGED
3"
1/8" NPT TEST
MIN.
GAUGE CONNECTION
SEDIMENT
TRAP
Table 14.1 - sea level manifold Pressure &
gas Consumption
manifold Pressure
model
( " W.C.):
size
CFH
55
Gal/Hr. Propane
Orifice Drill Size
CFH
65
Gal/Hr. Propane
Orifice Drill Size
CFH
85
Gal/Hr. Propane
Orifice Drill Size
CFH
110
Gal/Hr. Propane
Orifice Drill Size
CFH
135
Gal/Hr. Propane
Orifice Drill Size
CFH
156
Gal/Hr. Propane
Orifice Drill Size
CFH
180
Gal/Hr. Propane
Orifice Drill Size
CFH
215
Gal/Hr. Propane
Orifice Drill Size
CFH
260
Gal/Hr. Propane
Orifice Drill Size
CFH
310
Gal/Hr. Propane
Orifice Drill Size
Table 14.2 - gas Pipe Capacities - natural gas
Pipe
length (ft.)
1/2"
3/4"
10
132
278
20
92
190
30
73
152
40
63
130
50
56
115
60
50
105
70
46
96
80
43
90
100
38
79
125
34
72
150
31
64
➀ C apacities in cubic feet per hour through Schedule 40 pipe with maximum
0.3" W.C. pressure drop with up to 14" W.C. gas pressure. Specific gravity is 0.60
for natural gas and 1.50 for propane gas.
➁ F or pipe capacity with propane gas, divide natural gas capacity by 1.6. Example:
What is the propane gas pipe capacity for 60 feet of 1-1/4" pipe? The natural gas
capacity is 400 CFH. Divide by 1.6 to get 250 CFH for propane gas.
6-563.7
JOINT
UNION
TO
CONTROLS
➀ M anual shut-off valve is in the
"OFF" position when handle is
perpendicular to pipe.
natural
Propane
# of
3.5
10
orifices
54.0
22.1
n/a
0.61
4
50
1.10 mm
65.6
26.3
n/a
0.73
5
1.75 mm
57
81.0
34.0
n/a
0.9
5
47
1.25 mm
105.0
44.0
n/a
1.2
5
43
54
128.6
54.0
n/a
1.5
6
43
54
147.6
62.0
n/a
1.7
6
41
1.50 mm
171.4
72.0
n/a
2.0
7
41
53
204.8
86.0
n/a
2.4
9
42
54
247.6
104.0
n/a
2.9
9
38
52
295.2
124.0
n/a
3.4
12
41
53
natural gas
1"
1-1/4" 1-1/2"
2"
520
1050
1600
3050
350
730
1100
2100
285
590
890
1650
245
500
760
1450
215
440
670
1270
195
400
610
1150
180
370
560
1050
170
350
530
930
150
305
460
870
130
275
410
780
120
250
380
710
➀ ➁
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