23
A. GENERAL
1. All fuel piping to the Series PBC™ boiler is to be in
accordance with local codes. In the absence of local
regulations refer to the National Fuel Gas Code, ANSI
Z223.1/NFPA 54.
2. Size and install fuel piping to provide a supply of gas
sufficient to meet the maximum demand of all
appliances supplied by the piping.
3. Series PBC™ boilers are intended for operation with
Natural Gas or Propane with sulfur content of less than
105 ppm (150 mg/m
3
) peak with an annual average of
less than 20 ppm (30 mg/m
3
). Excessive sulfur content
in fuel input can result in black deposits resembling
coffee grounds in the combustion chamber of the boiler.
B. FUEL LINE SIZING
1. The required flow rate of gas fuel to the boiler can be
determined by the following.
The gas heating value can be supplied by the gas
supplier.
2. As an alternative, use Table 5.1 to determine the
required gas flow rate which uses typical heating values
for natural gas and liquefied petroleum (LP) gas.
3. Table 5.1 shows the maximum flow capacity of
several pipe sizes based on 0.3" of pressure drop.
a. The values shown are based on a gas specific
gravity of 0.60 (Typical for natural gas).
b. Multiply the capacities listed by the correction
factors listed for gas with a specific gravity other
than 0.60 to obtain the corrected capacity.
4. Size and install the fuel gas supply piping for no more
than 0.5 inches of water pressure drop between the
gas regulator and the boiler.
C. GAS SUPPLY PIPING - INSTALLATION
FUEL PIPING
5. FUEL PIPING
Pipe
Length
ft (m)
1/2" NPT
Pipe
3/4" NPT
Pipe
1" NPT
Pipe
1-1/4"
NPT
Pipe
1-1/2"
NPT
Pipe
10
(3.0)
132
(3.7)
278
(7.9)
520
(14.7)
1,050
(29.7)
1,600
(45.3)
20
(6.1)
92
(2.6)
190
(5.4)
350
(9.9)
730
(20.7)
1,100
(31.1)
30
(9.1)
73
(2.1)
152
(4.3)
285
(8.1)
590
(16.7)
890
(25.2)
40
(12.2)
63
(1.8)
130
(3.7)
245
(6.9)
500
(14.2)
760
(21.5)
50
(15.2)
56
(1.6)
115
(3.3)
215
(6.1)
440
(12.5)
670
(19.0)
60
(18.3)
50
(1.4)
105
(3.0)
195
(5.5)
400
(11.3)
610
(17.3)
70
(21.3)
46
(1.3)
96
(2.7)
180
(5.1)
370
(10.5)
560
(15.9)
80
(24.4)
43
(1.2)
90
(2.5)
170
(4.8)
350
(9.9)
530
(15.0)
90
(27.4)
40
(1.1)
84
(2.4)
160
(4.5)
320
(9.1)
490
(13.9)
100
(30.5)
38
(1.1)
79
(2.2)
150
(4.2)
305
(8.6)
460
(13.0)
The values are based on a specific gravity of 0.60 (typical for
natural gas). See Table 4.3 for capacity correction factors for
gases with other specific gravities.
Specific
Gravity
0.50
0.55
0.60
0.65
0.70
0.75
Correction
Factor
1.10
1.04
1.00
0.96
0.93
0.90
Specific
Gravity
0.80
0.85
0.90
1.00
1.10
1.20
Correction
Factor
0.87
0.84
0.82
0.78
0.74
0.71
Specific
Gravity
1.30
1.40
1.50
1.60
1.70
1.80
Correction
Factor
0.68
0.66
0.63
0.61
0.59
0.58
Table 5.1: Pipe Capacity:
Maximum Capacity of pipe in cubic feet per hour (cubic meters
per hour) with a pressure drop of 0.3" of water (75 Pa).
Boiler Input Rate
Gas Heating Value
Input Rate
(
ft³
/
hr
)
=
(
Btu
/
hr
)
(
Btu
/
ft³
)
Figure 5.1:
Suggested Near Boiler Gas Piping
Use a backing wrench on the gas valve inside of the
unit when threading the gas pipe into the gas valve
flange. Over torqueing the gas valve can cause
damage to the blower, gas valve or other components
inside the unit.
CAUTION
Содержание PBC-34
Страница 1: ...PBC Gas Boilers PBC 34 PBC 40 PBC 52 Combination Installation Operation Maintenance Manual Series...
Страница 22: ...20 WATER PIPING AND CONTROLS Figure 4 6 Recommended Central Heat Piping...
Страница 23: ...21 Figure 4 7 Recommended Domestic Hot Water Piping WATER PIPING AND CONTROLS...
Страница 31: ...29 Figure 7 2 Wiring Schematic and Connection ELECTRICAL CONNECTIONS...
Страница 45: ...E LIGHTING OPERATING PROCEDURES 43 START UP PROCEDURE...
Страница 57: ...THIS PAGE INTENTIONALLY LEFT BLANK...
Страница 60: ...58 REPAIR PARTS Figure 13 2 PBC 34 Combustion Components...
Страница 62: ...60 REPAIR PARTS Figure 13 3 PBC 40 and PBC 52 Combustion Components...
