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hybrid
7
DESIGN AND OPERATING PRINCIPLE
Unit operation logic
Heat recovery
Warm stale extract air from the room flows into the unit, where it is filtered by the extract filter, then air flows through the heat exchanger
and is exhausted outside by the extract fan. Cold fresh air from the outside flows into the unit, where it is cleaned by the supply filter. Then
the air flows through the heat exchanger and is directed to the room with the supply fan.
Supply air is heated in the heat exchanger by transferring the heat energy of warm and humid extract air to the cold fresh air. The air
flows are fully separated while flowing through the heat exchanger. Heat recovery minimizes heat losses, which reduces the cost of space
heating in the cold season.
Without heat recovery for models with bypass
In Summer Cooling mode, the bypass damper is open and room air passes through the heat exchanger without heat transfer. The
temperature of the air is not changed after passing through the heat exchanger.
No heat recovery for models without bypass with S14 automation
Press the "Summer Cooling mode" button on the control panel. The supply fan will stop and only the exhaust fan will run. Open the
windows to allow air from the outside to enter the room.
Freeze protection
The unit has automatic heat exchanger freeze protection modes depending on the unit model. A freezing danger appears, if the exhaust
air temperature downstream of the heat exchanger is below +5 °C and the intake air temperature upstream of the heat exchanger is
below -3 °C.
In case of freezing danger, the supply fan is turned off in the Hybrid (Max) (E) (ERV) S14 units. After temperature increase the unit returns
to the previous operation mode.
In the Hybrid (Max) (E) (ERV) S21 units, there are two modes for frost protection: switching off the supply fan and preheating the air (if
there is a preheater). Mode selection and settings are described in the control system user’s manual.
UNIT DESIGN
1
2
2
3
4
9
9
4
5
6
7
7
7
8
1
10
11
12
A
A
1
Damper (for Hybrid Max (E) (ERV) units).
2
Filter.
3
Electric heater only for Hybrid Max E (ERV) units.
