Samsung RC090MHXEA Installation And Maintenance Manual page 17

Operating the System in heating mode using an external
thermostat and / or a boiler run signal from an under floor
manifold.
You have now set the unit up to run from an external signal; the controller no longer drives the
unit.
Using a field supplied room thermostat or signal from an under floor heating system. This is
wired to the thermostat terminals for radiators wire from B20 – B24, for under floor heating
wire to B20 - B22
When the contact is made the unit will start and the water temperature will be controlled by
the boiler, you will not have any control over it. The water temperature is determined by the
outdoor temperature; the colder it is outside the warmer the water. The unit is running in
weather comp mode, you set this up using field settings 2011-2032.
You will see 0.0C on the screen; this shows the unit under external control using weather
compensation function to work out the water temperature. You set this up in the field settings
2011 to 2031. If you need to boost the heating water temp this can be done by pressing the
silver up and down buttons. This boosts the radiators by up to +5 C but warning this will cost
more money to run.
The heat pump is operated using a signal from a room stat (field supply) or from the under
floor heating manifold only. When you make a run signal a sun will appear in the screen of the
RC, the pump will also start.
When an external stat or run signal is used most of the functions of the Samsung remote are
disabled. A waging finger shows at the bottom to show this.
All these buttons are disabled and the functions they control are also disabled
Note:
when the heating command is sent to the unit it will not start for 3 minutes. And
when the thermostat or signal is removed the pump will run on for up to 6 minutes.
www.samsungehs.co.uk Hendra – August 2013 17