Bosch D371B, D371C Installation Manual

D371B/D371C

Installation Instructions

24 V/110 V Floor Mount

Door Holder

D371B/D371C | Installation Instructions | 1.0 Overview

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

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.

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2.0 Installation

2.1 Installing the Floor-Mount Bracket

Verify the bracket mounting can withstand the stress the door exerts on it through the

The D371B/D371C is packaged with the backbox mounted on the bracket. The backbox accepts electrical conduit through knockouts at the top, bottom, and back (Figure 2).

Figure 2: D371B/D371C Bracket Mounting

D371B/D371C Electromagnet.

D371B/D371C | Installation Instructions | 2.0 Installation

2.2 Attaching the Backbox to the Bracket

Refer to Figure 3 when attaching the backbox to the bracket.

Figure 3: Backbox to Bracket Mounting

1 - Floor-mount bracket 2 - Floor mounting anchor screws (4)

1. Remove the four backbox mounting screws.

2. Position the bracket so the backbox aligns with the

catch plate location on the door. Refer to Section 2.4 Mounting the Catch Plate to the Door on page 5 for the catch plate location and alignment.

3. Securely mount the bracket to the floor.

1 - Floor mount bracket 2 - Backbox 3 - Backbox screws (4) 4 - Anchor screws (4)

1. Mount the backbox to the bracket and connect the

wiring conduit.

2. Pull the circuit wiring through the conduit and into

the backbox.

The D371B/D371C operates on 24 VDC, 24 VAC, or 120 VAC. The D371B/D371C terminals accept wires between 12 AWG (2.3 mm) and 22 AWG (0.8 mm). You can wire 120 VAC to either Terminal L or Terminal H depending on the required holding force (Table 1).

Table 1: Specifications

Input Voltage

24 VDC nominal (18 VDC to 30 VDC)

24 VAC nominal (18 VAC to 30 VAC)

120 VAC nominal (90 VAC to 150 VAC)

Terminal C = Common Terminal L = Low voltage Terminal H = High voltage

Terminal Connections

Current Draw

Holding Force

C&L 20 mA 40 lb

(18 kg)

C&L 19 mA 40 lb

(18 kg)

C&H 20 mA 35 lb

(16 kg)

C&L 100 mA 110 lb

(50 kg)

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