Topvex FR800, FR1600, FR3800 Operation and Maintenance Instructions
Systemair Inc.
21
4.5 Cooling Recovery
Iftheextractairiscolderthantheoutdoorairandcoolingisrequired,theheatexchangercontrolis
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
(interruptionofthecoldoutdoorairow).Theunitwillkeepextractingwarmairforadenedperiodoftime
preventing any frost build up before going back to normal ventilation mode.
Recirculation:
Thereare3differentrecirculationcongurations.Firstisa5thportcongurationwithcontinuousexhaust
set to “NO”.Secondisa5thportcongurationwithcontinuousexhaustsetto“YES” in order to maintain
anuninterruptedrateofexhaust.ThelastoptionisanH-Typecongurationwheretheunitexhaustairis
recirculated through the supply stream (continuous exhaust has to be set to “NO” forthisconguration).
Thesecongurationsrequireadedicatedrecirculationdamperinterlockedwiththeoutdoorairdamperin
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
damperwillopen.Theunitwillrecirculatewarmairforadenedperiodoftimepreventinganyfrostbuildup
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.
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