Installation and Setup
22
homexpert
tm
by Honeywell THR840DUK Digital Thermostat
23
Installer setup functions
Function
Description
Setting Options
7: ES
ECO default temperature
18°C **
Options: 5° to 35°C
8: HC
Heating/Cooling options
0: No central cooling system installed **
1: Allows switching between heating and cooling systems
Thermostat cannot control cooling unless you select 1
9: OS
Frost protection temperature
5°C **
Options: — (none) or 5° to 16°C
10: EH
Electric heat
0: Resistive loads <3 A **
1: Resistive loads 3 to 8 A
See page 23 for important information
11: FS
RESET TO FACTORY DEFAULT
0: No change
1: Select 1 to restore default settings. All customised
settings will be lost.
Enter Installer Setup (see page 27), then press
p
or
q
for access to system settings
NOTE:
See descriptions of functions on page 24.
Customised settings for your system
Your heating system
Changes required
Setting Options
Standard gas boiler
(<30kW)
None
No change
Zone Valve
None
No change
Oil boiler
Function 1: Ot
Function 2: Cr
Set to 4 minutes
Set to 3 CPH
Thermal actuator
Function 2: Cr
Set to 12 CPH
Electric heating
Function 2: Cr
Function 10: EH
Set to 12 CPH
Set to 1 if load > 3A
Your cooling system
Changes required
Setting Options
Heat pump/air conditioner
Function 1: Ot
Function 2: Cr
Function 8: HC
Set to 4 minutes
Set to 3 CPH
Set to 1
Fan coil
Function 8: HC
Set to 1
NOTE:
After changing the above settings to accommodate a cooling system, you can switch the thermostat to
control either heating or cooling (see page 9).
This Manual: http://www.manuallib.com/file/2598268
