Horstmann HRT4-ZW User And Installation Instructions Manual page 4

Battery replacement
The HRT4-ZW runs on 2 x type AAA (Alkaline) non rechargeable batteries and is designed to give
a battery life of approximately two years.
Batteries should be
changed immediately
Low battery symbol
appears first when the
batteries are nearing
the end of their life
Remove the old batteries and replace them with two new AAA size
alkaline batteries ensuring that they are fitted correctly as indicated by
the terminal markings in the battery compartments.
Once the batteries are fitted, re-fit the thermostat to the wall plate
by engaging with the lugs at the top of the wall plate and push the
thermostat into position. Locate it over the captive screws at the base
of the wall plate and tighten so that the thermostat is locked into
position.
Check the temperature setting is correct and adjust if necessary.
Please dispose of the batteries responsibly.
ASR–ZW receiver unit
4
When the batteries are nearing the end of their life a low
battery symbol will appear in the display and the batteries
should be changed within a few days. If the batteries are
not changed at this point eventually a 'LO' battery message
flashes intermittently in the display and if this happens the
batteries should be changed immediately.
To change the batteries it is necessary to remove the
thermostat from the wall. To do this first undo the two
captive screws at the base of the thermostat and swing the
thermostat up and away from the wall plate.
The ASR–ZW receiver unit receives the Z-Wave radio
signals from the HRT4–ZW room thermostat.
In the unlikely event of a communication failure it is
possible to override the system and switch On and Off
using the On/Off buttons on the ASR-ZW receiver as a
local override.
If the override is used to override the HRT4-ZW
thermostat when it is functioning correctly then the
override will be cancelled by the next switching operation
of the thermostat and normal operation will be resumed.
In any case, with no further intervention, normal
operation will be restored within one hour of the override
being operated.