Section 3 – Installing the Control
3-29
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 Calculated Value
Standby
Capacity
For 4-hour standby time: 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
Capacity
For 4-, 5-, or 15-minute alarm time:
Total alarm curr. X 0.067 (4 min) 0.250 (15 min)
Total
Capacity
Add standby and alarm capacities
6. Use the Battery Selection Table to select the appropriate battery for the installation.
Table 6: Battery Selection Table
Capacity Recommended Battery Comment
4AH Yuasa NP4-12
7AH Yuasa NP7-12
12AH Yuasa NP12-12 Fits in large mercantile cabinet only.
14AH Yuasa NP7-12 Connect two in parallel.
17.2AH Yuasa NPG18-12 Fits in large mercantile cabinet only.
The standby battery is automatically tested for 10 minutes every 4 hours, beginning 4 hours after exiting
Programming mode. In addition, entry into the Test mode initiates a battery test. The VISTA-128BPT/VISTA-
250BPT also runs a 5-second battery test every 60 seconds to check if the battery is connected.
7. Connect the battery, referring to Figure 3-23.
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