Application B
If application B is selected, the control cable connect to the boiler should also connect to the 3-way valve (16)
4
AHS
1
10
5
5
16
9.1
11
12
9
M
2
3
8
9.2
6
7
FCU1
FCU2
FCUn
1 outdoor unit
2 Y-shape filter
3 shut-off valve (field supply)
4 wired controller (optional)
5 non-return valve (field supply)
6 drain valve (field supply)
7 fill valve (field supply)
8
buffer tank (field supply)
9
balance tank (field supply)
9.1 air purge valve
9.2 drain valve
10 expansion vessel (field supply)
11 Pump 2: outside circulation pump (field supply)
12 collector (field supply)
16 Motorised 3-way valve (field supply, field control)
FCU 1...n fan coil units
AHS additional heating source
NOTE
If the volume of balance tank (9) larger than 30L, the buffer tank(8) is unnecessary, otherwise the buffer tank(8) should be installed and the
total volume of buffer tank and balance tank should larger than 30L.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, which can provide additional heating source and ensure better
performance of the system when the ambient temperature is low.
Operation
When heating is required, either the unit or the boiler starts operating, depending on the outdoor temperature.
■ As the outdoor temperature is measured via the outdoor unit air thermistor, make sure to install the outdoor unit in the shade, so that it is not
influenced by the sun’s heat.
■ Frequent switching can cause corrosion of the boiler at an early stage. Contact the boiler manufacturer.
■ During heating operation of the unit, the unit will operate to achieve the target water flow temperature set on the controller.
■ During heating operation of the boiler, the boiler will operate to achieve the target water flow temperature set on the controller.
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