Wiring - Crown Boiler TWB Series Installation Instructions Manual

FIGURE 10.4: TWO-PIPE LIFT SYSTEM
• All wiring and grounding must be done in accordance with the authority having jurisdiction
or, in the absence of such requirements, with the National Electrical Code (ANSI/NFPA 70).
• Disconnect electrical power to the boiler and heating system before servicing. Positively
assure that no voltage is present. Lock electrical boxes to prevent someone from
inadvertently restoring power before the heating system is safe to operate.
• Never defeat or jump out safety devices.
• Protect each boiler circuit with a properly sized over-current protection device.
• Make electrical connections carefully according to the boiler's wiring diagram and
instructions.
• Wire additional field supplied safety limits, such as low water cutoffs and temperature limit
devices, in series with the 120V circuit used to power the boiler. Do not alter the boiler's
factory wiring when adding an additional limit device.
1) 120 Volt Wiring - Provide the boiler with its own 15A branch circuit with fused disconnect. 120VAC power connections are
made inside the Hydrolevel 3250-Plus hot water boiler control as follows (also see Figures. 11.0 and 11.1):
• Hot ("black") - Terminal "L1"
• Neutral ("white") - Terminal "L2"
• Ground ("green" or bare) - Ground screw on case of 3250-Plus.
The heating circulator is field wired to terminals C1 (hot) and C2 (neutral) in the 3250 Plus control. Use 14ga BX cable, or
other wiring compliant with local codes, (not supplied) to make this connection.
XI Wiring
WARNING
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