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Installing the Control
3-35
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-128BPEN Current Load
Total Current
Standby
Alarm
Polling Loop Subtotal (see Table 1)
Aux. Power Subtotal (see Table 2)
Alarm Output Subtotal (see Table 3)
VISTA-128BPEN PCB Current
(Includes 2-wire smoke detector
loading on zone 1)
250mA 330mA
Total Current Load
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.
UL
Household Fire or Combination 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.
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