AERCO Boiler Valve Controller (BVC) PRIOR to Serial-12-840-1 - Manual (Page 4)

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SAFETY PRECAUTIONS
WARNING
120 VOLTS AC IS USED IN THIS EQUIPMENT. DEATH ON
CONTACT OR SERIOUS PERSONAL INJURY MAY RESULT IF
EXPOSED CONNECTIONS ARE TOUCHED. THEREFORE,
EXERCISE EXTREME CARE WHEN CONNECTING POWER
WIRING TO THE UNIT. ALWAYS ENSURE THAT THE
EXTERNAL CIRCUIT BREAKER SUPPLYING LINE VOLTAGE
TO THE CONTROLLER IS TURNED OFF.
WARNING
THE BOILER VALVE CONTROLLER IS HOUSED IN A
LAMINATED FIBERGLASS ENCLOSURE. SINCE FIBERGLASS
IS AN INSULATOR, PROPER GROUNDING MUST BE
MAINTAINED BETWEEN THE INTERNAL EQUIPMENT AND
THE CONDUITS AND/OR CABLES ENTERING OR EXITING
THE ENCLOSURE.
WARNING
THE MOTORIZED VALVES USED IN THIS APPLICATION ARE
NOT INTENDED TO BE USED AS ISOLATION VALVES.