Installation Instructions

D371B/D371C | Installation Instructions | 1.0 Overview
2 Bosch | 2/06 | 33852C
Notice
Carefully follow these instructions to
prevent damage to the equipment.
Installation Standards
Install, test, and maintain the D371B/D371C according
to these instructions, the National Fire Protection
Association (NFPA) 72, local codes, and the authority
having jurisdiction (AHJ).
Failure to follow these instructions can
result in the failure of the D371B/D371C to
operate in alarm.
Bosch is not responsible for improperly installed,
tested, or maintained devices.
1.0 Overview
Use these instructions to install the D371B/D371C
24 V/110 V Floor Mount Door Holder.
The installation procedure includes:
• Installing the floor-mounted bracket,
• Attaching the backbox to the bracket,
• Connecting the electromagnet to the circuit wiring,
• Installing the electromagnet in the backbox, and
• Installing the catch plate.
The D371B/D371C operates on 24 VDC, 24 VAC, or
110 VAC. It provides up to 110 lb (49.9 kg) of holding
force for fire door or other magnetic applications.
Each door holder includes all hardware necessary to
install the floor-mount bracket, attach the backbox to
the bracket, mount the electromagnet in the backbox,
and attach the catch plate to a standard door. Install
the bracket on a door that swings open to within 5 in.
(12.7 cm) of a single gang backbox (Figure 1).
Figure 1: D371B/D371C Installation – Plan View
2
1
4
3
6
7
5
1 - Bracket
2 - D371B/D371C Electromagnet
3 - D371B/D371C Catch Plate
4 - Swivel base
5 - Door
6 - Floor
7 - Conduit
Use extension rods if the door does not swing open
within 5 in. (12.7 cm) of the backbox. Extension rods
are available in lengths of 1 in. to 4 in. (2.5 cm to
10 cm). The 40 in. (10 cm) hinged extension rod
compensates for misaligned catch plates and
electromagnets.
Use the D378 Extension Rod Wrench
when installing extension rods.