20
fig. 9 Water Pressure Switch
PLATE HEAT-EXCHANGER
11
Plate heat-exchanger is the secondary heat-exchanger used in monothermic types for heating the
domestic water. In need of domestic hot water, the 3 way electric valve sends the central heating
water from the primary heat-exchanger to the plate heat-exchanger. Heat of the central heating
water is transferred to the domestic water in the plate heat-exchanger. 12 plate type are used in 24
kW boilers while 14 plate type are used in 28 kW boilers. The plate heat-exchanger is mounted
using two bolts on the monothermic hydroblock. Leakage in the inlet and outlet of central heating
and domestic hot water circuits is prevented using O-rings.
Table 12 Plate Heat-Exchanger
Hydroblock connection Bolts (2 pieces)
Plate heat-exchanger water inlet & outlet onnections O-rings (4 pieces)
fig. 10 Plate Heat-Exchanger
WATER FLOW SENSOR
12
The water flow sensor measures the domestic hot water flow rate. It is integrated in the inlet
manifold of the hydroblock in both bithermic and monothermic types.
A turbine in the water flow sensor rotates during flow and supports a magnet. The turbine creates a
magnetic field. The hall effect sensor reacts to the magnetic field and sends data to the main board.
The main board controls the domestic hot water delivery according to the flow rate values delivered
from the water flow sensor. When the water flow rate reaches 3 lt/min, domestic hot water delivery
begins. When the rate is below 2.5 lt/min, domestic hot water delivery is stopped.
The hall effect sensor is on the water flow sensor and can be easily mounted or removed.
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