Bacharach H25-IR - Manual (Page 24)

Preparing for Operation H25-IR
18 Instruction 3015-4342
2.7 External Relay Connections
The H25-IR includes four SPDT relays whose relay contacts are rated 2 A at 250 VAC (inductive) and 5 A at
250 VAC (resistive). External alarm devices (e.g., horns, bells, strobe lights, etc.) can be connected to these
relays and activated when their associated relay is energized. Refer to Section 2.5.3 Relays.
Locate the external relay connector on rear of unit (refer to Section 1.7.2 Rear View).
Secure the leads from the external device and its power source to the external relay connector as shown in the
diagram below. This diagram shows a typical alarm device being connected to Relay 1. Repeat this procedure,
as necessary, for the remaining relays.
Typical Relay 1 Wiring
 Each relay may be connected as normally open (NO), or normally closed (NC).
 The relay contacts are rated 2 A at 250 VAC (inductive) and 5 A at 250 VAC (resistive).
 Power for the external alarm devices is supplied from an external power source.
 Jumper the ‘Neutral’ line of an external power source to the ‘Common’ terminals on the relay connector.
 Connect one end of the alarm device to the ‘NO’ terminal of the desired relay.
 The other end of the alarm device is connected to the other leg of the external power source. For
protection, install an in-line fuse of the appropriate size and design for the external alarm device being
used.