Bosch Appliances D2071A manual Initiating Circuit Alarm Relay, Mode 1 and Mode 2 Restrictions

D2071A Operations & Installation Guide 2.0 Installation

2.3.3Mode 3

Mode 3 (Figure 6) uses a 1.8 kΩ EOL resistor at the end of the loops. Trouble Reports are sent on an open circuit. This mode is required for sprinkler supervision in NFPA 72 central station and remote station slave applications or for Trouble Reports from the FACP. Use Mode 3 for 72 central station slave applications.

Figure 6: Mode 3 Class “B” Wiring

10

11

1

NO10

C 11

NC

1 - 1.8 kΩ EOL resistor

The Mode 3 status conditions are:

Alarm (Closed): 0.0 VDC to 1.7 VDC

Normal: 1.9 VDC to 5.8 VDC

Trouble (Open): 6.0 VDC to 10.2 VDC

D2071A transmits an Alarm Report for a trouble condition using a Mode 1 or Mode 2 circuit to monitor FACP trouble output or sprinkler valve tamper.

2.3.4Mode 1 and Mode 2 Restrictions

Use Mode 3, not Mode 1, for sprinkler supervision (stand-alone) in NFPA 72 remote station installations. Only use Mode 2 when a NC valve tamper device must be used, and only on AHJ approval.

Refer to Section 1.5 Listings and Approvals on page 4 for more information about modes and the NFPA requirements.

2.3.5Wiring

Stand-alone Applications

1.Connect the supervision devices such as valve tamper switches (up to 20 for each circuit) to Terminals 10 and 11 (Zone 2) or Terminals 11 and 12 (Zone 3) as shown in Figures 4 through 6 on pages 11 and 12.

2.Program Class “B” Mode for the wiring configuration you use. Use no more than 100 Ω resistance on the sensor loops for the Class “B” circuits.

Slave Communicator Applications

1.When connecting the D2071A to an FACP, use the Mode 3 configuration for the slave communicator applications (Figures 4 through 6).

2.Connect Terminals 10 and 11 (Zone 2) or Terminals 11 and 12 (Zone 3) to the trouble outputs (dry closure) on the FACP.

3.Connect Terminal 10 or 12 to the NO contact and connect Terminal 11 to the C contact.

4.Install a 1.8 kΩ resistor between the NO and NC contacts.

5.Program Class “B” Mode for Mode 3.

2.3.6Class “B” Circuit Parameters

1.Using a voltmeter measure the voltage across the terminal connections to determine the electrical condition of the Class “B” supervisory circuits (refer to Figures 4 through 6 for loop voltages).

2.Connect the loop and power the D2071A.

2.4Initiating Circuit Alarm Relay

Use Terminals 16, 17, and 18 for initiating circuit alarm relay connections.

When using the optional Initiating Circuit Alarm Relay, install a D136 Relay in Socket K6. The D136 provides a Form “C” dry contact, rated at 2 A maximum current at 30 VDC (power from an independent supply). The relay activates (reverse state) when the Class “A” Alarm Initiating Circuit (Zone 1) goes into an alarm condition. It deactivates when the circuit restores to normal.

•Terminal 17 is the common (C) terminal.

•Terminal 16 is the normally closed (NC) terminal.

•Terminal 18 is the normally open (NO) terminal.

In a normal state Terminals 16 and 17 have continuity. When activated, Terminals 17 and 18 have continuity.

2.4.1Installation

To install a D136 Relay into socket K6 (labeled ALARM RELAY):

1.Slide back the D2071A cover to expose the socket (Figure 7 on page 13).

The D136 Relay has two pins on one side and three pins on the other side.

2.Place the relay into the socket with the pins oriented as shown in Figure 7.

3.Attach the relay flush left or flush right.

1 2 Bosch 09/04 74-06200-000-F