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ENABLE
NIGHT PURGE
HEVAC CONTROL AGENCIES PTY LTD. 7/54 HOWLEYS RD.
NOTTINGHILL, VIC. 95627888
www.hevac.com.au
17/10/19
With this feature enabled it is possible to setup a low running cost building night time ventilation purge cycle, to vent
built up heat from within the building with cooler outside air in order to reduce the cost of mechanical cooling during
occupancy hours at startup. During the user programmable
enable times
, if the
room temperature is above the
main set point
and the measured
outdoor temperature is cooler
by an adjustable amount to the room
temperature, this software will cause the supply fan (connected to relay 5) to energise & the modulating motorised
economy cycle dampers (connected to analog output Y1) to reposition to the full fresh air mode. These output
states are maintained until the room temperature drops to a settable temperature difference in relation to the outside
air temperature or / & the O/A temperature rises above the room temperature setpoint, or the enable time ends.
"On Temp Diff " is the amount of temperature that the outside air has to
be cooler then the room temperature before purge mode is allowed to
trigger night time purge ventilation mode.
"Off Temp Diff " is the temperature difference to the room temperature for
purge cycle to turn off. This cycle can repeat during the programmed
night purge period, But always subject to the room temperature being
above the normal operating control setpoint.
The purge cycle ends regarless at the programmed end operating time.
PRESS UP or DOWN
BUTTONS TO ALTER VALUE
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