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19Function of the System
3
MTD-ERV 350 Methods of Operation
The MTD-ERV 350 has been designed and produced as a system for controlled ventilation of residential buildings. It
comprises two air fl ows that hygienically exchange their energy.
· Polluted air is drawn off by the exhaust air fan (A) from,
for example, the kitchen, toilet and shower (B).
· The heat exchanger (C) absorbs the heat from the exhaust air.
· The supply air fan (D) draws in fresh air from outside (E).
· The heat exchanger (C) heats up the intaken air using the heat absorbed from the exhaust air.
· If a moisture exchanger is installed (option), moisture is also transferred from the exhaust air to the sup-
ply air (for further information, see section 2.1.6).
· The heated fresh air is delivered into the living rooms and bedrooms (F).
· The now cooled polluted air from the kitchen, bathroom and toilet is discharged into the atmosphere (G).
· The bypass (H) allows the exhaust air to be discharged to the atmosphere without passing through the
heat exchanger so that no heat is transferred to the fresh air (for further information, see section 2.1.3).
· The preheater (I) (option) ensures preheating of outside air so that balanced ventilation with heat recov-
ery is assured even with moderate to severe frost (up to 150 m³/h at -15° C) (for further information, see
section 3.4.2).
· The post-heater (J) (option) additionally heats the supply air (after it has already been heated in the heat
exchanger) before it is delivered into the living rooms (for further information, see section 3.4.3).
The balanced ventilation system contributes to energy saving, a healthy room climate and an optimum living climate
and prevents problems with moisture.
3.4. Additional Options
Only for MTD-ERV 350 Luxury versions, with the exception of the preheater that can be installed in any MTD-
ERV 350.
Please refer to the identifi cation plate on the top of the MTD-ERV 350 to determine whether you have
a basic or luxury version of the system.
These are external devices that can be connected to the MTD-ERV 350 Luxury versions (preheater
also to Basic versions).
3.4.1. Preheater in MTD-ERV 350
All MTD-ERV 350 systems with “VV” in the device name (see identifi cation plate on the top of the MTD-ERV
350) are equipped as standard with a preheater. All other MTD-ERV 350 versions can be equipped with a pre-
heater as an option.
The preheater is a heating element that is in-
stalled in the outside air duct of the MTD-ERV 350
just upline of the heat exchanger. The preheater
heats the cold outside air before it reaches the
heat exchanger in the event of moderate to se-
vere frost. In this way the heat exchanger is pro-
tected against freezing in addition to the standard
frost protection system.
The advantage of the preheater compared with the
standard frost protection system is that balanced
ventilation can be maintained even in the event of
frost. In the event of a frost risk, the intake of out-