NOHMI BOSAI
NOHMI BOSAI FRRU004-DCM4 Dual Single Contact Module
Manufacturer: NOHMI BOSAI
Model: FRRU004-DCM4
Features of FRRU004-DCM4
- One simple LED for status indication
- NFPA Class A (Styles 6 & 7) and Class B (Style 4) for SLC
- NFPA Class A (Style D) and Class B (Style B) for IDC
- Electronic address setting
- Downsized unit
- Easy installation
Description
- “The Dual Contact Module (FRRU004-DCM4) monitors multiple contact points, each assigned a unique address from a single device. You can configure the FRRU004-DCM4 to supervise either a normally open or closed contact. Additionally, it supports Class A wiring for single contact monitoring, and Class B wiring for supervising two contacts.When properly wired, the FRRU004-DCM4 stays fully supervised. A red LED clearly shows the module’s status—flashing under normal conditions and glowing steadily when a contact is activated. If a malfunction occurs, the LED turns off. When monitoring two contacts, the module prioritizes conditions, with activation taking precedence, followed by an open circuit, and lastly, normal operation.”
Specifications of FRRU004-DCM4
| No. | Item | Specification (In case of one contact supervising) | Specification (In case of two contacts supervising) |
|---|---|---|---|
| 1 | Rated voltage range of SLC input power (S+,S-) | 22.0 to 24.0V | 22.0 to 24.0V |
| 2 | Maximum SLC 24 VDC standby current (S+,S-) | 250µA | 250µA |
| 3 | Maximum SLC 24 VDC alarm current (S+,S-) | 1mA | 1mA |
| 4 | IDC input circuit wiring style | NFPA Class A (Style D) | NFPA Class B (Style B) |
| 5 | End-of-line resistor for IDC | N/A | 5.1kΩ, 1/2W |
| 6 | Maximum wiring resistance of IDC | 100Ω | 100Ω |
| 7 | Maximum wiring capacitance of IDC | 1µF | 1µF |
| 8 | Operating temperature range | 0°C to 49°C (32°F to 120°F) | 0°C to 49°C (32°F to 120°F) |
| 9 | Operating humidity range | 0 to 93% (non-condensing) | 0 to 93% (non-condensing) |
| 10 | Address per module | 1 Address | 2 Addresses |
| 11 | Dimensions | 106mm (4.17 inches) (H) x 106mm (4.17 inches) (W) x 29mm (1.14 inch) (D) | 106mm (4.17 inches) (H) x 106mm (4.17 inches) (W) x 29mm (1.14 inch) (D) |
| 12 | Applicable electrical box for installation | North American 64mm (2-1/2 inches) deep 2-gang box | Standard 4 inches square box 38mm (1-1/2 inch) deep box |
Installation
Figure 1: Installation into the compatible electrical box
Wiring Diagram
Figure 2: Wiring diagram in case of one contact supervising
Figure 3: Wiring diagram in case of two contacts supervising (Normally-open contact)
Figure 4: Wiring diagram in case of two contacts supervising (Normally-closed contact) (Not recognized as NFPA Initiating Device Circuit)
