Determining The Size Of The Standby Battery - Honeywell ADEMCO VISTA-40 Installation And Setup Manual

VISTA-40 Installation and Setup Guide
3. In Table 3, enter devices connected to the Alarm
Output. Calculate alarm currents, then add to get
the Alarm Output current subtotal.
Table 3: Alarm Output Current Load
Device Device Current X
Model # # of Units
Alarm Output Subtotal
(terminals 4 & 5 – 1.7A max.)

Determining the Size of the Standby Battery

The cabinet supplied with the control panel can house
batteries of up to 12V, 14AH (two 12V, 7AH batteries
wired in parallel). The VISTA-ULKT kit provides a
cabinet that can house batteries of up to 12V, 17.2AH
and that may be used with this panel. The total
standby current drawn from the auxiliary power and
polling loop outputs combined must be limited to
270mA when 14AH batteries are used; and to 390mA
when 17.2AH batteries are used.
DO NOT use Gates batteries (sealed lead-acid
type). These batteries require a different
charging voltage than is supplied by the panel.
Household Fire or Combination
U L
Household/Fire/Burglary installations require
the use of a backup battery that is capable of
providing 24 hours of standby time followed by
4 minutes of alarm time. UL1023 Household
Burglary-only installations require the use of a
backup battery that is capable of providing 4
hours of standby time followed by 4 minutes of
alarm time.
3-26
Total Current
Standby Alarm
XXXXXX
XXXXXX
XXXXXX
XXXXXX
XXXXXX
XXXXXX
XXXXXX
4. In Table 4, enter the total calculated subtotals of
all listed outputs from Tables 1 through 3, then add
to get the combined current.
Table 4: Total VISTA-40 Current Load
Polling Loop Subtotal (see Table 1)
Aux. Power Subtotal (see Table 2)
Alarm Output Subtotal (see Table 3)
VISTA-40 PCB Current (Includes 2-
wire smoke detector loading on
Total Current Load
Use Table 5 to determine the required backup battery
capacity and use Table 6 to determine the battery
model number. A dual battery harness is supplied
that allows two batteries to be wired in parallel for
increased capacity.
5. Using the total calculated from Table 4, calculate
the battery capacity required for the installation.
Table 5: Battery Capacity Calculation Table
Capacity Formula
Standby For 4-hour standby time:
Capacity Total standby current X 4 hours
X 1.4 contingency factor.
For 24-hour standby time:
Total standby current X 24
hours X 1.1 contingency factor.
Alarm For 4-, 5-, or 15-minute alarm
Capacity time:
Total alarm curr.
Total Add standby and alarm
Capacity capacities
Total Current
Standby Alarm
250mA 330mA
zone 1)
Calculated
Value
X 0.067 (4 min)
X 0.250 (15 min)