Disconnect Switch (Hochiki America Model Hcvr-Ds Or Som-R-Ds) - Hochiki FirePro Xtinguish Installation And Operation Manual

12.3.3 Disconnect Switch (Hochiki America model HCVR-DS or SOM-R-DS)

To comply with NFPA requirements, a Disconnect Switch (model HCVR-DS or SOM-R-DS) may be installed
in the EXTING circuit. The purpose of this switch is to help prevent accidental activation of the aerosol
generators during testing and maintenance of the system.
The Disconnect Switch must not be used to Abort an activated release countdown sequence!
Install the Disconnect Switch as indicated on the plans. A single-gang back box (or similar) must be used to
securely mount the SOM-R-DS switch. Ensure that all connections are secure and protected. See Figure
12.3.3.
Under normal circumstances the Disconnect Switch is in the Enable position. When the switch is moved to the
Disable position, the HCVR-3 control panel will indicate a trouble. As long as the switch remains in the Disable
position, the HCVR-3 is disconnected from the sequential activator modules, preventing the panel from
activating the aerosol generators. System testing and maintenance may be performed while the Disconnect
Switch is in the Disable position.
WARNING: ALWAYS ensure that the HCVR-3 panel is in a normal state before returning
the Disconnect Switch back to the Enable position! Setting the switch to Enable while
the HCVR-3 is in a release state will activate the aerosol generators!
The Disconnect Switch must be
installed between the HCVR-3
panel and the first HCVR-SQA
module!
-
+
HCVR-3
EXTINGUISHING
OUTPUT
+
EXTING
-
Switch is shown in the Disconnected (Disabled) position.
24 volt Auxiliary power is not shown in these diagrams.
24 VDC power is necessary for proper operation of the HCVR-SQA module.
Figure 12.3.3 – Disconnect Switch Diagram and Circuit Wiring
FirePro Xtinguish I&O Manual
Disconnect
Switch
DISABLE
All circuit connections to be made
inside of electrical back box
Red Red
Yellow Yellow
Page 55 of 113
HCVR-SQA Sequential
Activator Module
IN EXT +
HCVR-SQA
Module
IN EXT -
Aerosol generator connections
To next HCVR-SQA
(if applicable)
OUT to other HCVR-
SQA modules
V1.05 UL