EAS ELECTRIC ETHKH160 Manual De Instrucciones página 60

The volume of the buffer tank(5) should be larger than 30L. The drain valve(21) should be installed at the lowest position of the water
circulating system.
Pump operation
With no room thermostat connected to the indoor unit(2) , the circulated pump (2.1) and (7) will operate as long as the unit is on for space heating/
cooling.
Details on pump configuration can be found under "Setting the pump speed".
Space heating and cooling
According to the season, the user will select cooling or heating through the user interface.
The unit (1) and (2) will operate in cooling mode or heating mode to achieve the target water flow temperature.
In heating mode, the 2-way valve(8) is open. Hot water is provided to both the fan coil units and the floor heating loops.
In cooling mode, the 2-way valve(8) is closed to prevent cold water running through the floor heating loops(FHL).
When several loops in the system by remotely controlled valves, it might be required to install a by-pass valve (26) to avoid the flow
switch safety device from being activated. See also "Application 2".
Wiring of the 2-way valve(8) is different for a NC (normal closed) valve and a NO (normal open) valve，the NO valve is unavailable to
this unit! Make sure to connect to the correct terminal numbers as detailed on the wiring diagram.
The ON/OFF setting of the heating/cooling operation is done by the user interface.
4.5 Application 5
■ Space heating with an additional boiler (alternating operation).
■ Space heating application by either the unit or by an additional boiler connected in the system.
■ The unit controlled contact (also called "permission signal for the additional boiler") is determined by the outdoor temperature (thermistor
located at the outdoor unit). See "Field settings/OTHER HEATING SOURCE"
■ Bivalent operation is possible for both space heating operation and domestic water heating operation.
■ If the additional boiler only provide heating for space heating, the boiler must be intergrated in the piping work and in the field wiring according
to the illustration of application A.
■ If the additional boiler is also provide heating for domestic hot water, the boiler must be intergrated in the piping work and in the field wiring
according to the illustration of application B.
■ If the temperature of water from the indoor unit is not high enough, Application C can be used. An additional 3-way value should be installed,
if the temperature of water from indoor unit is high enough, then the boiler will be bypassed; when the temperature is not high enough, the
3-way value will act and the water from indoor unit will flow through the boiler and be heated.
NOTE
NOTE
CAUTION
8
V.1