LGBGas–fired boiler
These terms are used throughout this manual to bring attention to the presence of hazards of various risk levels or to important information concerning the life of the product.
Control Supplement
LGB-4 & LGB-5 Series 2 – Natural gas
Universal Control System
Contents |
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Installation ....................... |
2 |
Gas piping ......................... |
3 |
Wiring ............................... |
4 |
Operating instructions ..... |
6 |
Verification testing .......... |
7 |
Parts ................................. |
8 |
Refer to |
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LGB • Installation • |
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Start-Up • Service • |
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Parts Manual |
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for additional information
Indicates presence of hazards that can cause severe personal injury, death or substantial property damage.
Indicates special instructions on installation, operation or maintenance that are important but not related to personal injury or property.
Control Supplement must only be used by a qualified installer/service technician. Read all instructions before installing. Failure to follow all instructions in proper order can cause severe personal injury, death or substantial property damage.
Part Number 550-141-918/0304
LGB-4 & 5 • Control Supplement • UCS • Nat. Gas
I Installation
Install pilot burner. See Figures 1a and 1b. Follow Figure 1b for pilot burner location, placing the burner with pilot bracket in the fourth position from the left for the LGB-4 and the fifth position from the left for the LGB-5, as shown.
Install gas controls and ignition control as shown in Figure 3 on page 7.
In Canada — mount rating plate on interior jacket panel.
Figure 1a
Pilot burner assembly
Figure 1b
Pilot location
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Part Number 550-141-918/0304 |
LGB-4 & 5 • Control Supplement • UCS • Nat. Gas
II Gas piping
Supply pipe sizing
Connect gas piping to boiler
Table 1
Gas supply pipe capacities
1.Size natural gas piping from Table 1. Size piping to provide proper inlet pressure to gas valve when operating at rated input.
a.Inlet gas pressure to manual main shut-off gas valve minimum 5" W.C., maximum 13" W.C.
b.If pressure to gas valve exceeds 13" W.C., install 100% lock-up gas pressure regulator upstream of hand valve.
c.To obtain approximate cubic feet per hour, divide input (Btu/hr) by 1000.
2.Size gas piping considering:
a.Diameter and length of gas supply piping.
b.Number of fittings.
c.Maximum gas consumption (including any possible future expansion).
d.Allowable pressure drop from gas meter to boiler. For pressure drops, see ANSI Z233.1 latest edition. Canadian installations must comply with B149.1 or B149.2 Installation Code.
3.Remove knockout disc from jacket panel side to which gas supply will be piped.
4.Follow good piping practices.
5.Pipe joint compound (pipe dope) must be resistant to corrosive action of liquefied petroleum gases. Apply sparingly only to male threads of pipe joints.
6.Install drip leg at inlet of gas connection to boiler. Where local code/utility requires, extend drip leg to floor.
7.Install ground joint union when required for servicing.
8.Support piping by hangers, not by boiler or its accessories.
9.Purge all air from supply piping.
10.Before operating boiler, check boiler and its gas connections for leaks.
Do not check for gas leaks with an open flame - use bubble test. Failure to use bubble test or check for leaks can cause severe personal injury, death or substantial property damage.
a.Close manual main shut-off valve during any pressure testing greater than 13" W.C.
b.Disconnect boiler and gas valve from gas supply piping during any pressure test greater than 13" W.C.
11.In Canada — manual main shut-off valve must be identified by installer.
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Pipe length, feet * |
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PIPE |
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(Natural gas capacities given in MBH) |
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(Specific Gravity 0.60 @ Pressure Loss of 0.30" W.C.) |
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SIZE |
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10 |
20 |
30 |
40 |
50 |
75 |
100 |
150 |
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1 1/4" |
1,050 |
730 |
590 |
500 |
440 |
360 |
305 |
250 |
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1 1/2" |
1,600 |
1,100 |
890 |
760 |
670 |
545 |
460 |
380 |
2" |
3,050 |
2,100 |
1,650 |
1,450 |
1,270 |
1,020 |
870 |
710 |
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2 1/2" |
4,800 |
3,300 |
2,700 |
2,300 |
2,000 |
1,650 |
1,400 |
1,130 |
3" |
8,500 |
5,900 |
4,700 |
4,100 |
3,600 |
2,900 |
2,500 |
2,000 |
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4" |
17,500 |
12,000 |
9,700 |
8,300 |
7,400 |
6,000 |
5,100 |
4,100 |
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*Include measured length of gas supply piping and allowance in feet for number and size of fittings.
Part Number 550-141-918/0304 |
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