homexpert THR842DUK User Manual page 13

Installation and Setup
Customised settings for your system
Your heating system Changes required
Standard gas boiler None
(<30kW)
Zone Valve None
Oil boiler Function 1: Ot
Function 2: Cr
Thermal actuator Function 2: Cr
Electric heating Function 2: Cr
Your cooling system Changes required
Heat pump/air conditioner Function 1: Ot
Function 2: Cr
Function 8: HC
Fan coil Function 8: HC
NOTE: After changing the above settings to accommodate a cooling system, you can switch the thermostat to
control either heating or cooling (see page 10).
Setting Options
No change
No change
Set to 4 minutes
Set to 3 CPH
Set to 12 CPH
Set to 12 CPH
Setting Options
Set to 4 minutes
Set to 3 CPH
Set to 1
Set to 1
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Description of functions
Ot Minimum boiler off time: Check proper setting
for your system (see page 24).
Cr Cycles per hour: Check proper setting for your
system (see page 24).
Pb Proportional band width: If your heating system
is oversized for your home, you can compensate
by increasing the width of the control proportional
band up to 3°C.
tO Temperature offset: In some cases, the
thermostat must be installed in a location that
does not accurately control temperature for
optimum comfort in other rooms. You can set the
thermostat to compensate for this by adjusting
the offset.
uL Maximum temperature: When the p button
is pressed, the thermostat will not allow a target
temperature above the maximum you set.
homexpert by Honeywell THR842DUK Wireless Digital Thermostat
tm
LL Minimum temperature: When the q button is
pressed, the thermostat will not allow a target
temperature lower than the minimum you set.
ES ECO default temperature: This is the default
target temperature when the thermostat is in ECO
mode (see page 11).
HC Heating/cooling options: When set to 1, the
thermostat can control both heating and cooling
systems (see page 9).
OS Frost protection temperature: Minimum
temperature allowed when the thermostat is off
(see page 8).
LC Loss of communications: Determines how the
system operates if wireless signal is lost between
thermostat and relay box.
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