LGB-5 CSD-1 Series 2 Propane gas – Control Supplement
8Part Number 550-110-682/0304
For your safety, turn off electrical
power supply before making any
electrical connections to avoid
possible shock hazard.
A strain relief bushing and adapter
must be used at each point where
wiring passes through the boiler
jacket or control cases to protect
wiring insulation.
The boiler limit controls and low
water cutoff(s) are exterior to the
boiler jacket, and must be wired per
N.E.C. class 1 in conduit. The wire
(No. 14 gauge or heavier) and
conduit for these controls is supplied
by the installer — it is not included
with the boiler.
Assembly illustration and wiring
diagrams
This Supplement contains a schematic and ladder
wiring diagram.
The diagrams show limit control and low water cutoff
connections for both water and steam boilers.
See Figure 5, pages 12 and 13 for a typical finished
assembly.
General
Refer to LGB Manual for further information.
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 line voltage wiring external to
boiler jacket must be N.E.C. class 1.
Provide a separate electrical circuit with a fused
disconnect switch (15 amp recommended) to supply
the boiler. Wiring to the boiler must be No. 14 gauge
or heavier, installed in conduit.
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
and sense wires and 125 °C pilot burner ground wire).
Wiring procedure
1. Mount all controls as directed in Section C of this
Supplement. Refer to the assembly illustration,
Figure 5, page 12 for component locations.
2. Mount the junction box supplied with the boiler
on the inside left (or right) side of the jacket as
shown in the assembly illustration (using screws
and nuts provided). The junction box must be
mounted on the same end of the boiler as the
controls will be mounted.
3. Attach the transformer/relay to the junction box.
4. Mount the CSD-1 control panel on the jacket
interior panel as shown in the assembly
illustration, Figure 5, page 12 (using screws and
nuts provided).
5. Crimp connect ¹⁄₄" spade terminals (provided) to
the pilot gas valve wires (if not already done in
Section A of this Supplement). Connect the pilot
valve black wire to the ignition control PV
terminal. Connect the pilot valve white wire to the
main gas valve TR terminal.
6. Connect pilot burner ground wire, spark wire and
sense wire to ignition control as directed in wiring
diagram and Figure 2, page 5.
7. The main gas valve wires are pre-attached to the
CSD-1 control panel. Connect these wires as
shown in the wiring diagram.
8. Use minimum 14-gauge thermoplastic wire
(105 °C or better), supplied by installer, to
complete wiring of the remaining components
according to the appropriate wiring diagram and
the assembly illustration. Route all wiring to
external components (limit controls and low water
cutoffs) in conduit per N.E.C. class 1.
Wiring
D
