Detcon 840-RD - Manual (Page 18)

7.0 Opti ons
7.1 Option for Battery Back-up Operation
This option provides a nominal 1 hour of battery back-up power to the Gas Detection Alarm System. The
battery back-up system consists of two 12 VDC / 0.8 Amp-hour batteries in series, along with the requisite
low voltage cut-off circuitry. The batteries may be isolated during exchange or while in long-term storage
by using the battery disconnect switch shown in Figure 4. The low voltage cut-off circuit is designed to
disconnect the battery supply if the voltage is drained below 20 VDC. This is for battery protection
purposes. There is a battery restore switch on the Motherboard PCB, which must be pressed after the low
voltage cut-off is triggered. This is only necessary if the unit is going to be restored under battery power.
It is not necessary if restored under VAC power.
8.0 Spar e Par ts
500-U05077-001 Motherboard
PCB
500-U05073-LCD Controller Board PCB W/ LCD Display
000-003606-000 Replaceable Power Supply with cables
340-121200-000 12 VDC Batteries (Optional)
360-BR2330 Date/Time Clock NICAD Battery
9.0 War ranty
Detcon, Inc., as the manufacturer, warrants under intended normal use each new Model 840-N4X controller
to be free from defects in material and workmanship for a period of one year from the date of shipment to
the original purchaser. Should the controller fail to perform in accordance with published specifications
within the warranty period, return to Detcon, Inc., for necessary repairs or replacement. All warranties and
service policies are FOB the Detcon facility located in The Woodlands, Texas.
Model 840-RD Operator Manual Rev. 0 Page 14 of 14