V Gas piping
Size and connect gas supply piping per EGH Manual, Section V.
The gas supply can enter from either the right or left side of the jacket. Be sure the gas train is directed to the correct side.
Support gas line securely. Do not support weight of gas line off of boiler gas train.
Purge air from gas piping and perform gas line and gas connection leak test per Section V of the EGH Manual.
VI Wiring
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.
Assembly illustrations and wiring diagrams
This Supplement contains three wiring diagrams and associated assembly illustrations. Refer to the following, as applicable:
•Water boilers
•Steam boilers, gravity return — Figures 7 and 8
•Steam boilers, pumped return — Figures 9 and 10
General
Refer to EGH Manual, Section VI 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).
Wiring procedure
1.Mount all controls as directed in Section III of this Supplement. Refer to the assembly illustration for the type of boiler installed (Figure 6, 8 or 10).
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). Mount the junction box 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
5.Crimp connect ¹⁄₄" spade terminals (provided) to the pilot gas valve wires if not already done in Section I of this Supplement.
6.If optional vent damper is installed, make sure damper harness has been routed through a strain relief bushing in the jacket and damper actuator as directed in Section I of this Supplement. Secure damper harness conduit to top of jacket with clamps provided.
7.The main gas valve wires are
Connect these wires as shown in the wiring diagram.
8.Use the wiring harness provided with the boiler to complete wiring of the remaining components according to the appropriate wiring diagram and assembly illustration.
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