Bosch D370B, D370C Installation Manual

D370B/D370C

Installation Instructions

24 V/110 V Wall Mount Door Holder

Notice

Carefully follow these instructions to prevent damage to the equipment.

Installation Standards

Install, test, and maintain the D370B/D370C 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 D370B/D370C to operate in alarm.

Bosch is not responsible for improperly installed, tested, or maintained devices.

1.0 Overview

Use these instructions to install the D370B/D370C 24 V/110 V Wall Mount Door Holder. The D370B/D370C can be surface or flush mounted.

The installation procedure includes:

• Installing the surface mount backbox, if required,

• Connecting the electromagnet to the circuit wiring,

• Installing the electromagnet in the backbox, and

• Installing the catch plate.

The D370B/D370C 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.

Use the D370B/D370C for flush-mounted applications. Each door holder includes all hardware necessary to mount it in a backbox and attach the catch plate to a standard door. You can attach the D370B/D370C to a door that swings open to within 3 in. (7.6 cm) of a single-gang backbox (Figure 1).

Figure 1: D370B/D370C Installation – Top View

1 - 3 in. (7.6 cm) maximum 2 - Door 3 - D370B/D370C Catch Plate mounted to the

door

4 - D370B/D370C Electromagnet flush mounted

to the backbox

5 - Wall

Use extension rods if the door does not swing open within 3 in. (7.6 cm) of the backbox. Extension rods are available in lengths of 1 in. (2.5 cm) to 4 in. (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.

When you cannot flush mount, use the D372B/D372C Series Backbox to surface mount the D370B/D370C Electromagnet.

D370B/D370C

2.0 Installation

2.1 Installing the D372B/D372C Backbox

You can flush mount the D370B/D370C to a standard single-gang backbox or surface mount it to the D372B/D372C Backbox.

Verify the backbox can withstand the stress the door exerts on it through the

The D372B/D372C Backbox accepts electrical conduit through knockouts in the top, bottom, and back (Figure 2).

Figure 2: D372B/D372C Backbox Installation

D370B/D370C Electromagnet.

2.2 Connecting the D370B/D370C to Circuit Wiring

The D370B/D370C operates on 24 VDC, 24 VAC, or 120 VAC. The D370B/D370C 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

Refer to Figure 3 for the D370B/D370C terminal locations.

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)

1 - D372B/D372C Backbox 2 - Conduit knockout 3 - Attachment screws (4)

1. Align the backbox with the catch plate location on

the door. Refer to Section 2.4 Mounting the Catch Plate to the Door on page 3 for the catch plate location and alignment.

2. Securely mount the backbox to the wall.

3. Connect the wiring conduits to the backbox.

4. Pull the circuit wiring through the conduit and into

the backbox.

Figure 3: D370B/D370C Terminal Locations

CLH

1 - Terminal C 2 - Terminal L

3 - Terminal H

Do not loop wires under the terminal screws. Break the wires and reconnect them.

2 Bosch | 2/06 | 33851D

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