Mechanical Keyswitch; Powering Up The System; Internal Zones; Mechanical Keyswitch Wiring - Regency 4720 Installation Manual

Regency ® Model 4720 Control/Communicator Installation Manual (P/N 150476, Rev. A)

Mechanical Keyswitch

7.6
A normally open mechanical keyswitch may be wired between Terminals 14 (loop power) and 38 (Zone
16). Figure 7.6a shows a mechanical keyswitch connected to the Model 4720 along with Ready and Armed
Lights.
Note 1: When a mechanical keyswitch is used, you lose the use of Zones 13 through 16.
Note 2: If a mechanical key is used, you must select the Muxed (4203) Touchpads option during system
programming.
Note 3: The keyswitch option is not to be used in UL applications since supervision annunciation is not provided.

Powering Up the System

8
Note: In UL Fire applications, the system will power up as soon as you plug in the transformer. It is not necessary to flip
the switch.
Wire each accessory and auxiliary device with the power down. After you install each one, test it by applying
power again.

Internal Zones

9
This section applies to the 16 internal zones of the Model 4720 only. For information on wiring of the expansion
zones, refer to Section 12. Zones 1 through 16 (Terminals 23 through 38) may be used with normally open
contacts, normally closed contacts, or a combination of both. The illustrations below show the different types of
zone configurations. Loop power is available from Terminals 11-14.

Mechanical Keyswitch Wiring

Figure 7.6a:
31
Revised 10/98
0476G11A.DSF