Honeywell THOR VM1 Reference Manual page 49

7. Press the push button to disconnect the UPS. The UPS battery maintains its charge but is disconnected from the power
circuitry of the Thor VM1.
8. Reattach the access panel, torquing the M3 screws to 4-5 inch pounds using a #2 Philips bit.
9. When the Thor VM1 is attached to external power, the UPS battery is automatically reconnected.
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