LGBGas–fired boiler
Control Supplement
LGB-6 to LGB-23 Series 2 – Natural gas
Universal Control System
Contents |
|
I. Installation ..................... |
2 |
II. Gas piping ...................... |
4 |
III. Wiring ............................ |
5 |
Sequence of operation ....... |
5 |
Wiring procedure ............... |
8 |
IV.Operating instructions . 9 |
|
V. Verification testing ..... |
10 |
VI.Parts list ....................... |
11 |
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.
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 damage.
This Control Supplement must only be used by a qualified installer/service technician. Read these instructions completely before beginning the installation. Failure to follow these instructions can cause severe personal injury, death or substantial property damage.
Part Number 550-141-916/0304
LGB-6 to LGB-23 Series 2 – Control Supplement
I Installation
1.Assemble pilot burner and flame sensor to main burners with pilot brackets. See Figures 1 and 2 (page 3). Install ground wiring as shown in Figures 1 and 2 (page 3).
2.Reinstall burner assemblies. See Table 1, below for pilot burner and flame sensor locations.
3.Install gas controls and ignition control panel as shown in Table 2, below and Figure 5 on page 10.
4.LGB-21 through LGB-23 require High Gas Pressure Switch Control Carton - 7" and 5" W.C. Attach pressure switch to interior jacket panel. See Figure 5 on page 10.
5.Canada only - mount rating plate on interior jacket panel.
Table 1 |
|
Boiler |
Flame Sensor* |
Pilot Burner* |
|
Boiler |
Flame Sensor* |
Pilot Burner* |
||||
Pilot burner and flame sensor |
Model |
No. 1 |
No. 2 |
No. 1 |
No. 2 |
|
Model |
No. 1 |
No. 2 |
No. 1 |
No. 2 |
|
Number |
|
Number |
||||||||||
locations |
|
|||||||||||
LGB-6 |
2 |
-- |
9 |
-- |
|
LGB-15 |
2 |
16 |
13 |
27 |
||
|
|
|
||||||||||
|
|
LGB-7 |
2 |
-- |
11 |
-- |
|
LGB-16 |
2 |
18 |
15 |
29 |
|
|
LGB-8 |
2 |
-- |
13 |
-- |
|
LGB-17 |
2 |
18 |
15 |
31 |
|
|
LGB-9 |
2 |
-- |
15 |
-- |
|
LGB-18 |
2 |
20 |
16 |
33 |
|
|
LGB-10 |
2 |
-- |
16 |
-- |
|
LGB-19 |
2 |
20 |
16 |
34 |
|
|
LGB-11 |
2 |
-- |
16 |
-- |
|
LGB-20 |
2 |
22 |
16 |
36 |
|
|
LGB-12 |
2 |
-- |
16 |
-- |
|
LGB-21 |
2 |
22 |
16 |
36 |
|
|
LGB-13 |
2 |
14 |
11 |
23 |
|
LGB-22 |
2 |
24 |
16 |
38 |
|
|
LGB-14 |
2 |
16 |
13 |
25 |
|
LGB-23 |
2 |
24 |
16 |
38 |
|
|
* From left burner |
|
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|
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Table 2
Gas control arrangement
Boiler |
7" |
Inlet Pipe Size |
5" |
Inlet Pipe Size |
|||
Model |
W.C. |
W.C. |
|||||
|
|
|
|
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Number |
Carton |
Left base |
Right base |
Carton |
Left base |
Right base |
|
LGB-6 |
A and B |
1" |
-- |
A and B |
1 ¼" |
-- |
|
LGB-7 |
A and B |
1" |
-- |
A and B |
1 ¼" |
-- |
|
LGB-8 |
C and D |
1" |
-- |
C and D |
1 ¼" |
-- |
|
LGB-9 |
C and D |
1" |
-- |
C and D |
1 ¼" |
-- |
|
LGB-10 |
E, F and G |
1 ¼" |
-- |
E |
1 ½" |
-- |
|
LGB-11 |
E, F and G |
1 ¼" |
-- |
F and G |
2" |
-- |
|
LGB-12 |
E, F and G |
1 ¼" |
-- |
F and G |
2" |
-- |
|
LGB-13 |
H |
1" |
1" |
H |
1 ¼" |
1 ¼" |
|
LGB-14 |
I |
1" |
1" |
I |
1 ¼" |
1 ¼" |
|
LGB-15 |
J |
1" |
1" |
J |
1 ¼" |
1 ¼" |
|
LGB-16 |
J |
1" |
1" |
J |
1 ¼" |
1 ¼" |
|
LGB-17 |
J |
1" |
1" |
J |
1 ¼" |
1 ¼" |
|
LGB-18 |
K |
1 ¼" |
1" |
K |
1 ½" |
1 ¼" |
|
LGB-19 |
L |
1 ¼" |
1 ¼" |
M |
1 ½" |
1 ½" |
|
LGB-20 |
L |
1 ¼" |
1 ¼" |
N |
2" |
1 ½" |
|
LGB-21 |
L |
1 ¼" |
1 ¼" |
O |
2" |
2" |
|
LGB-22 |
L |
1 ¼" |
1 ¼" |
O |
2" |
2" |
|
LGB-23 |
L |
1 ¼" |
1 ¼" |
O |
2" |
2" |
|
2 |
Part Number 550-141-916/0304 |
Universal Control System – Natural gas
I Installation – continued
Figure 1
Pilot burner assembly, typical
Figure 2
Main flame sensor assembly
Part Number 550-141-916/0304 |
3 |
LGB-6 to LGB-23 Series 2 – Control Supplement
II Gas piping
Table 3
Natural gas supply pipe sizing
1.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 outlet to boiler. For pressure drops, see ANSI-Z223.1 – latest edition. Canadian installations must comply with B149.1 or B149.2 Installation Code.
2.Size natural gas piping from Table 3, below. 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 7" W.C. standard (5" on special order) – maximum 13" W.C.
b.If pressure to gas valve exceeds 13" W.C., install positive dead-end lockup gas pressure regulator upstream of hand valve.
c.To obtain approximate cubic feet per hour, divide input (BTU/HR) by 1000.
3.Remove gas supply knockout disc from jacket panel.
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 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 – BUBBLE TEST. Failure to use bubble test or test for leaks can cause severe personal injury, death or substantial property damage.
a.Close manual main shut-off valve during any pressure testing at less than 13" W.C.
b.Disconnect boiler and gas controls from gas supply piping during any pressure test greater than 13" W.C.
11.Set gas pressure switch as follows or to local inspector’s requirements (LGB-21 through LGB-23 only):
a.High – 14" W.C.
12.Canada only - manual main shut-off valve must be identified by installer.
Pipe |
|
*Pipe length, in feet (Natural Gas capacities, listed in MBH) |
|
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Size |
10 |
20 |
30 |
40 |
50 |
75 |
100 |
150 |
1 ¼" |
1,050 |
730 |
590 |
500 |
440 |
360 |
305 |
250 |
1 ½" |
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 |
2 ½" |
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 |
|
|
|
|
|
|
|
|
|
4" |
17,500 |
12,000 |
9,700 |
8,300 |
7,400 |
6,000 |
5,100 |
4,100 |
*Include measured length of gas supply piping and allowance in feet for number and size of fittings.
4 |
Part Number 550-141-916/0304 |
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