Crown TWZ065, Руководство по установке

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FIGurE 9.4: tWO-PIPE lIFt sYstEM
X Wiring
WARNING
• 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 - The boiler should be provided with its own 15A branch circuit with fused disconnect. 120VAC power con -
nections are made inside the L7248L cold start control or the L7224A warm start control as follows (also see Figures. 10.0
thru 10.2):
• Hot (“black”) - Terminal “L1”
• Neutral (“white”) - Terminal “L2”
• Ground (“green” or bare) - Ground screw on case of L7248L or L7224A.