Weil-McLain LGB-5 Manual page 5

LGB-5 CSD-1
Install pilot burners & orifices — EXISTING installation
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 the LGB-5
propane control carton
2. Remove jacket door and access panel.
3. Disconnect wiring and tubing from existing pilot
burner and main flame sensor.
4. Remove all burners.
a. Remove 3.95 mm natural gas main burner
orifices in manifold.
b. Install 2.40 mm propane gas main burner
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.
Figure 2
Electronic pilot burner
assembly to main burner
Part Number 550-110-682/0304
Series 2 Propane gas – Control Supplement
only.
Use pipe dope sparingly only on
male ends. Use pipe dope compatible
with propane gases. Do not
overtighten orifices. Failure to follow
these guidelines could result in severe
personal injury, death or substantial
property damage.
7. Reinstall burners. See Figures 1 and 2 for pilot burner
mounting and locations.
8. See Figure 3, page 6 for propane piping.
9. Replace elbow in pilot gas line with tee. Install pilot
shutoff valve for standing pilot in one side of tee and
electronic pilot shutoff valve in the other side, as
shown in Figure 3, page 6.
10. Attach pilot switch box to jacket. See Figure 5 (page
12). Connect thermocouple to pilot switch box. Cut
60" pilot tubing (provided) into 2 pieces to make
connections from tee in pilot line to pilot switch box
and from pilot switch box to standing pilot.
11. Remove natural gas valve train.
12. See following section in this Supplement for
installation of propane gas valve train.
13. Reinstall access panel.
14. Wire per wiring instructions and wiring diagrams in
this Supplement. Add splices as needed.
15. Attach:
a. 550-223-710 label at boiler operating instruction
label. Place so that this label reads first.
b. 550-223-796 label at rating label.
c. Wiring diagram over diagram on door (one on
each base).
16. To place in operation, follow instructions in the
Manual and this Supplement
LGB
.
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