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 – Propane gas
Universal Control System
Contents |
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Installation ....................... |
2 |
Conversion (Natural/Propane ...) 2 |
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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 550-141-919/0304
LGB-4 & 5 • Control Supplement • UCS • Propane
I New installation Conversion from natural gas to propane gas
1.Remove all burners from base box assembly. Remove 3.95 mm natural gas main burner orifices in manifold. Install 2.40 mm propane main burner orifices. Use pipe dope sparingly only on male ends. Use pipe dope compatible with propane gases. Do not overtighten orifices.
2.Install pilot burners. See Figure 1. Follow Table 1 for electronic pilot burner and standing pilot burner (Q327) locations on manifold.
3.Install gas controls and ignition control as shown in Figure 3 on page 7 or Figure 4 on page 8. Use Propane Control Carton, Number 4 and 5.
4.Attach pilot switch box to interior jacket panel (see Figure 3 or 4, pages 7 and 8). Connect thermocouple from standing pilot to switch box. Cut 60" pilot tubing into 2 pieces to make connections from pilot valve to pilot switch box and from pilot switch box to standing pilot.
5.Attach:
a.550-223-710 label above or to the left of boiler operating instruction label. Place so that this label reads first.
b.550-223-796 label next to rating label.
c.Wiring diagram on door.
d.Canada only - mount rating plate on interior jacket panel.
6.Proceed to section III, Gas Piping.
IIExisting installation Conversion from natural gas to propane gas
This conversion is to be installed by a Weil-McLain distributor or other qualified agency in accordance with the manufacturer's instructions and all codes and requirements of the authority having jurisdiction. Failure to follow instructions could result in serious injury or property damage. The qualified agency performing this work assumes responsibility for this conversion.
For your safety, turn off electrical power supply before making any electrical connections to avoid possible electrical shock hazard.
1.These instructions are for use with Propane Control Carton Number 4 and 5.
2.Remove jacket door(s) and access panel.
3.Disconnect wiring and tubing from existing pilot burner.
4.Remove all burners. Remove 3.95 mm natural gas main burner orifices in manifold. Install 2.40 mm propane main burner orifices. Use pipe dope sparingly only on male ends. Use pipe dope compatible with propane gases. Do not overtighten orifices.
5.Remove and discard existing electronic pilot burner from pilot burner tube. Replace with electronic pilot burner in carton.
6.Attach Q327 standing pilot to burner tube in kit. Connect pilot tubing and thermocouple to pilot.
7.Re-install burners. See Table 1 for location of pilot burners.
8.Attach pilot switch box to jacket. See Figure 3 or 4, pages 7 and 8. Connect thermocouple to pilot switch box. Cut 60" pilot tubing into 2 pieces to make connections from tee in pilot line to pilot switch box and from pilot switch box to standing pilot.
9.Remove natural gas valve train.
10.Install propane gas valve train and fittings from carton. (See paragraph 4, page 3 of this Supplement.)
11.Re-install access panel(s).
12.See Figure 3 or 4, pages 7 and 8, for propane piping.
13.Wire per wiring diagram, pages 4 – 5. Add splices as needed.
Attach:
a.550-223-710 label above or to the left of boiler operating instruction label. Place so that this label reads first.
b.550-223-796 label next to rating label.
c.Wiring diagram over diagram on door (one on each base).
14.To place in operation,follow instructions on constant burner pilot light-up label and boiler operating label.
15.Replace jacket doors.
2 |
Part Number 550-141-919/0304 |
LGB-4 & 5 • Control Supplement • UCS • Propane
Figure 1
Pilot burner assembly
Table 1
Pilot and flame sensor locations
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Electronic |
Standing |
|
Boiler |
pilot |
pilot |
Propane |
model |
burner * |
burner * |
carton |
LGB-4 |
4 |
2 |
4 and 5 |
LGB-5 |
5 |
2 |
4 and 5 |
* Burner position, counting from left to right
III Gas piping
1.Contact gas supplier to size pipes, tanks and regulator.
a.Inlet gas pressure to manual main shut-off gas valve minimum 11" 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.
2.Remove knockout disc from jacket panel side to which gas supply will be piped.
3.Follow good piping practices.
4.Pipe joint compound (pipe dope) must be resistant to corrosive action of liquefied petroleum gases. Apply sparingly only to male threads of pipe joints.
5.Install drip leg at inlet of gas connection to boiler. Where local code/utility requires, extend drip leg to floor.
6.Install ground joint union when required for servicing.
7.Support piping by hangers, not by boiler or its accessories.
8.Purge all air from supply piping.
9.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.
10.In Canada - manual main shut-off valve must be identified by installer.
Part Number 550-141-919/0304 |
3 |
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