MTD ERV 350, ERV 365 manual Definition of Terms

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2.Instructions for the User

This chapter describes how you should use the MTD-ERV 350.

Congratulations, you are now the owner of the MTD-ERV 350,

the heat recovery unit from Zehnder Com- fosystems. We wish you every comfort.

ing the summer months. Admitting the cool night air on warm days allows the room temperature in thehometobereduced.Thebypassfunctionsauto- matically.You simply have to set your comfort tem- perature. See section 2.3.2 for further information. The MTD-ERV 350 then maintains this temperature as closely as possible.

2.1Definition of Terms

The MTD-ERV 350 has the following functions:

•Balanced ventilation.

•Heat recovery.

•Bypass for free cooling.

•Frost protection.

•Chimney sweep control.

•Moisture recovery (option).

Theseterms/propertiesaredescribedinmoredetail briefly in the following sections.

Ensure that the comfort temperature in winter is not set below the tem- perature you prefer.

If the comfort temperature in winter is below the preferred temperature, it is possible for the heating to be switched on with the bypass open. That is a waste of energy.

2.1.1Balanced Ventilation

TheMTD-ERV350isabalancedventilationsys- tem.Thisisthemosteconomicalandbalanced form of ventilation for homes. In a balanced ventilation system, polluted air from kitchen, bathroom, toilet and possibly even store room is drawn off and replaced by an equal volume of fresh air in the living room and bedroom.Air gaps under the doors ensure good air circula- tion in the home.This air circulation is literally balanced.

Ensure that these gaps are not covered by, for example, rubber door seal strips or high-pile carpets. This would prevent the system from operating optimally.

2.1.4 Frost Protection

The MTD-ERV 350alsohasafrostprotectionsystem. This protects the heat exchanger (or the optional combined heat and moisture exchanger, see sec- tion 2.1.6) from freezing.The risk of freezing exists in the winter months with moderate to heavy frost. The MTD-ERV 350 is equipped as standard with an automatically activated frost protection system that

-when there is a risk of frost - temporarily reduces the supply of outside air so that condensa- tionintheexchangercannotfreeze.Apreheatercan also be installed in the MTD-ERV 350 as an option. Thishastheadvantagethatthebalancedventilation then remains operational.The inlet of cold outside air then no longer needs to be reduced.In addition, this option offers greater comfort as the supply air is again preheated to more or less room temperature. If there is no preheater installed in your MTD-ERV 350, ask your installer about the possibilities.

2.1.2 Heat Recovery

Apartfromensuringtherightbalancebetweensup- plyandexhaustair,theMTD-ERV 350alsooffersthe advantagethattheheatfromtheexhaustairisgiven off to the fresh, generally cooler outside air.This is made possible by the integral heat exchanger. In this way, roughly 95% of the discharged heat is re- covered.The supply air can enter the rooms almost at room temperature. Draughts are now a thing of the past.

2.1.3 Bypass for Free Cooling

Apart from transferring heat from the exhaust air to the fresh, generally cooler outside air, the MTD- ERV 350 also offers the possibility of discharging the warmer exhaust air directly into the atmosphere without passing through the heat exchanger.This is madepossiblebytheintegralbypass.Thebypassis an additional circulating air duct that (temporarily) interrupts the heat transfer between the exhaust air and supply air.The cool outside air is then not pre- heated before it enters the dwelling.

The bypass is used particularly on warm days dur-

2.1.5 Chimney Sweep Control

The MTD-ERV 350alsohasachimneysweepcontrol system.This is a system that prevents the MTD-ERV 350 from creating an imbalance in the ventilation system, i.e. between the supply and exhaust air. The chimney sweep control system functions auto- matically.Thissystemblocksorresetsotherventila- tion control systems that could possibly create an imbalance in the ventilation system and that can be automatically switched on and off by the software. One example of this is that the supply and exhaust air fans cannot be switched off separately when the chimney sweep control system is active.

The chimney sweep control system is employed in dwellings with open fire, as here air can be drawn back by the draught of the chimney. If problems occur with the smoke discharge via the draught of the chimney, this situation must on no account be caused (or exacerbated) by the MTD-ERV 350.The chimney sweep control system then interacts with the existing ventilation control systems in such a waythattheMTD-ERV 350cannot(orcannolonger) cause an imbalance in the ventilation system.

Instructions for the User 3