10
VUT/VUE 550/900 PBW EC
www.ventilation-system.com
WATER HEATER CONNECTION
In order to attain maximum power the water heater should be counterflow connected.
In case of the direct-flow connection, the water heater has lower power but higher frost-resistant properties.
Mixing unit diagram (not included in the delivery set) of the water heater is shown in the following figure.
Direct flow connection
Water inlet
Water outlet
Water outlet
Water inlet
Counterflow connection
MIXING UNIT DIAGRAM
M
1
2
2
3
5
6
4
7
8
9
1. Water heater
2. Shutoff valves
3. Circulation pump
4. Bypass damper
5. Boiler
6. Regulating valve of the
heater with an actuator
7. Non-return valve
8. Coarse filter
9. Water pressure sensor (nc).
HEAT MEDIUM REGULATING VALVE ACTUATOR
Caution!
The unit operates in two modes: Winter and Summer.
The Winter mode is activated at outdoor temperature below +10 °C.
At higher outdoor temperature the unit operates in Summer mode.
In Summer mode the unit operates regardless of the return heat medium temperature in the mixing unit.
In Winter mode the unit has following temperature limits: the unit will not be turned on at a return heat medium temperature below
+40 °C.
When the return heat medium temperature r40 °С and higher, the unit will turn on with a delay of 90 seconds.
The unit turns off when the return heat medium temperature falls below +20 °C.
