AERCO Modulex EXT 1530 - 3060 - Manual (Page 45)

MODULEX EXT 1530, 1912, 2295, 2677, 3060 BOILERS
Installation, Operation & Maintenance Manual
WARNING!
DANGER OF FATAL ACCIDENT DUE TO ELECTRIC SHOCK!
120 VAC connections may be present on the external connection
board when power is supplied to the boiler.
The electrical connections must be carried out only by a qualified
person. Before carrying out the connections or any other operation
on the electrical parts, always switch off and disconnect the
electricity supply and ensure for yourself that it cannot be
accidentally turned on.
3.24.3 Service Relay Requirement
Upstream of the electrical connection, a service relay is required (not supplied) which, when the
additional electrical safety devices intervene, shuts down the electrical supply to the on-off fuel
valve fitted on the gas supply circuit, but NOT to the boiler, so as to guarantee the running of the
pump and permit the boiler to cool down.
3.24.4 Electrical Requirements
• No changes may be made to the wiring of the boiler.
• All connections should be designed in accordance with the applicable regulations.
• Label all wires prior to disconnection when servicing controls. Wiring errors can cause
improper and dangerous operation.
NOTE
Verify proper operation of the boiler after all servicing operations.
OMM-0095_0E AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 45 of 138
GF-139 Phone: 800-526-0288 12/01/14