Required Battery Maintenance - Honeywell WEB-645 Installation Instructions Manual

Required Battery Maintenance

Typically, regular maintenance includes eventual replacement of the 12V sealed lead-acid backup battery (unless a WEBs-AX
unit installed without the battery—see "Battery-less option" on page 14).
Battery life expectancy is a function of its discharge cycles (the number of discharges and their depth) and the ambient
temperature of the battery during normal operation. In most applications, the battery should see relatively few discharges.
Therefore, ambient temperature has more to do with determining the life expectancy of the battery than does any other factor.
If the controller is installed in a conditioned space, the battery should provide dependable service for approximately three years
(average). In an environment where the operating temperature is higher (that is, 50ºC or 122ºF), you should only expect the
battery to last approximately one year.
The battery is automatically float-charged during normal operation (while power is applied to the unit). The controller monitors the
battery and periodically loads the battery to test its ability to maintain battery-backed functions. You should investigate any battery
trouble message. Check the voltage level and its connections to the unit. Replace the battery as required.
To order a new battery, see the "Standard Replacement Parts" section on page 14.
REPLACING THE 12V BATTERY
The battery is secured in the enclosure by a metal bracket and a nut (2V sealed lead-acid battery in WEB-645-AX enclosure.).
Fig. 5. 2V sealed lead-acid battery in WEB-645-AX
enclosure.
Item Description
1 6-position power connector (unplug when replacing battery).
2 Enclosure mounting stud and Keps nut securing battery strap.
3 Metal battery bracket (bottom hooks into slot in enclosure bottom).
4 Quick-connect Faston battery terminals.
5 12V 1.2Ah sealed lead-acid battery, with 0.187" Faston quick-connect terminals.
WARNING
When replacing the battery or harness, maintain proper polarity as marked on the label inside the unit. Although
the controller is fully protected against shorted battery terminals, the battery itself is not internally protected.
Use extreme care to not short circuit the battery. A shorted battery may overheat rapidly and damage the power
wiring harness or cause other physical harm to the hardware.
WEB-645, CP-645 NETWORK CONTROLLER
13 62-0432—01