415005 Topvex TR Operation and Maintenance Instructions

Topvex TR800, TR1300, TR1800, TR4000

Operation and Maintenance Instructions

Systemair Inc.

4.5 Cooling Recovery

If the extract air is colder than the outdoor air and cooling is required, the heat exchanger control is

reversed in order to return the cool extract air.

Note

The following is only valid if the cooling recovery function is set to Active in the program menu.

4.6 Exchanger Frost Prevention

If the exhaust air temperature falls below the frost threshold of the unit the exchanger frost prevention

function will be triggered and the unit will cycle between ventilation mode and the selected type of frost

prevention mode in order to prevent any frost build up within the unit.

Types of frost prevention mode:

Exhaust only:

During exhaust only frost prevention, the supply fan will shut down and the outdoor air damper will close

(interruption of the cold outdoor airow). The unit will keep extracting warm air for a dened period of time

preventing any frost build up before going back to normal ventilation mode.

Recirculation:

There are 3 different recirculation congurations. First is a 5th port conguration with continuous exhaust

set to “NO”. Second is a 5th port conguration with continuous exhaust set to “YES” in order to maintain

an uninterrupted rate of exhaust. The last option is an H-Type conguration where the unit exhaust air is

recirculated through the supply stream (continuous exhaust has to be set to “NO” for this conguration).

These congurations require a dedicated recirculation damper interlocked with the outdoor air damper in

order that as the outdoor air damper closes, the recirculation path is opened and vice versa.

During recirculation frost prevention, the outdoor air damper will close and the dedicated recirculation

damper will open. The unit will recirculate warm air for a dened period of time preventing any frost build up

before going back to normal ventilation mode.

Note

The following is only valid if the exchanger frost prevention function is set to Active in the program menu.