CLIVET WSAN-YMi 21, Manual For Installation, Use And Maintenance, Page: 36 / 156

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7 TYPICAL APPLICATIONS
Pump operation and space heating
The pump (1.8) and (10) will operate when there is request for heating from A and/or B. Pump (23.1) will operate only when there is
request for heating from B.
The outdoor unit will start operating to achieve the target water flow temperature.
The target water leaving temperature depends on which room thermostat is requesting heating.
When the room temperature of both zones is above the thermostat set point, the outdoor unit and pump will stop operating.
NOTE
Make sure to correctly configure the room thermostat installation on the user interface. Refer to chapter Start-up and configuration /
ROOM THERMOSTAT,
It is the installers’ responsibility to ensure that no unwanted situations can occur (e.g. extremely high temperature water going
towards floor heating loops, etc.)
The supplier does not offer any type of mixing station.
Dual set point control only provides the possibility to use two set points.
When only zone A requests heating, zone B will be fed with water at a temperature equal to the first set point.
This can lead to unwanted heating in zone B.
When only zone B requests heating, the mixing station will be fed with water at a temperature equal to the second set point.
Depending on the control of the mixing station, the floor heating loop can still receive water at a temperature equal to the set point of
the mixing station.
Be aware that the actual water temperature through the floor heating loops depends on the control and setting of the mixing station.
NOTE
The wiring of room thermostat 5A (for fan coil units) and 5B(for floor eating loops) should follow 'method C' as described in see
chapter Electrical connections / ROOM THERMOSTAT, and the thermostat which connect to port 'C' (in the outdoor unit) should be
placed on the zone where floor heating loops is installed(zone B), the other one connect to port 'H' should be placed on the zone
where fan coil units are installed (zone A).
NOTE
The volume of balance tank(8) should be greater than 40L (for 5~9kW unit, greater than 20L)
The drain valve (6) should be installed at the lowest positon of the system.
An independent backup heater can be selected and installed in the door.
Pump (10) and pump (23.1) should be controlled by outdoor unit and connect to corresponding port in the outdoor unit (refer to
Connection for other components/For outside circulation pump P_o and For tank loop pump P_d and mix pump P_c).
The advantage of the dual set point control is that the heat pump will/can operate at the lowest required water flow temperature when
only floor heating is required.
Higher water flow temperatures are only required in case fan coil units are operating.
This results in better heat pump performance.