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Installation and Setup
18
homexpert
tm
by Honeywell THR840DUK Digital Thermostat
19
Activate batteries and mount thermostat
Remove the thermostat cover (see page 13). Discard the plastic tab
inside to activate the batteries, then replace batteries. The thermostat
should display the current room temperature.
Replace the thermostat front cover, then mount the thermostat on the
wall bracket as shown at left.
NOTE: This symbol will flash on the screen when battery
power is low. Remove cover and replace batteries with
two fresh AA alkaline batteries.
System test
After installation, you should check to make sure the system is
working properly.
1 Check the power supply to make sure the heating system is on.
2 Press the p button to raise target temperature to maximum
(35°C).
If the system is set up properly, the “heating” symbol should
appear on the thermostat display, and the heating system should
begin running.
3 To stop the test, press the q button to lower the target
temperature to an appropriate level. The heating system should
turn off and the “heating” symbol on the thermostat screen should
disappear.
Set temperature to maximum
35.0
°
c
35.0
°
c
Heat should turn on