Weil-McLain LGB-20 - Manual (Page 5)

CSD-1 Control System - Natural gas
5 Part Number 550-141-815/1010
1. All wiring must be installed in accordance with the requirements of the National
Electrical Code and any additional national, state or local code requirements having
jurisdiction. All wiring external to boiler jacket must be N.E.C. Class 1.
2. The boiler must be electrically grounded in accordance with the National Electrical
Code, ANSI/NFPA No. 70-latest edition. Use 105 °C thermoplastic wire, or equivalent,
if any original wire must be replaced (except for pilot spark, sense and ground wires).
3. Wiring to boiler must be No. 14 gauge or heavier. Install in conduit.
4. A separate electrical circuit with a fused disconnect switch (15 amp. recommended)
should be used for the boiler.
5. Refer to wiring diagrams, Figure 3 (pages 6 and 7) and Figure 5 (page 9). See section,
“Wiring Procedure” on page 8.
6. Figure 5 on page 9 is the Field Wiring Diagram. See Figure 3, pages 6 and 7, for the
schematic and ladder wiring diagrams.
IV
Wiring
For your safety, turn off electrical power supply before making any electrical
connections to avoid possible electrical shock hazard.
1. Install water or steam trim components as required by CSD-1 latest edition. See the
boiler manual for tapping locations.
a. Water boilers require:
s
automatic reset limit control.
s
b. Steam boilers require:
s
reset limit control.
s
water cutoff.
III
Water and steam trim compo nents