1 MOUNTING (3) Mount the power supply (I) Attach mounting bracket to box or wall. on mounting bracket. Single-gang box or wall “Screw or Wood screw (x 2) Connect DC +, ~ wires, observing polarity, Connector grounding wire, @ Plug AC cord into socket securely. 2 BEFORE ASKING FOR REPAIRS — i your intercom system does not work properly or malfunctions, do riot attempt to change or rectify wing, Ask qualified personnel. If the system Is not being used, PS-1820 can be unplugged.