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CO2 ECONOMY CYCLE OVERRIDE SETTINGS
HEVAC CONTROL AGENCIES PTY LTD. 7/54 HOWLEYS RD.
NOTTINGHILL, VIC. 95627888
www.hevac.com.au
18/10/19
Enable this feature if a CO2 sensor is connected to the controller for air quantity
control to reduce CO2 build up, by either overriding the economy cycle damper
operation connected to analogue output terminal Y1 (to increase fresh air intake)
or / &
to control an internal relay set for on/off CO2 control. Typical settings (factory
default if enabled ) are to proportionally modulate open the economy cycle damper
set to the fresh air mode as CO2 levels exceeds 700 ppm and cause full fresh air
mode if levels reach 1000 ppm, or with this latest update can now alternatively just
operate a relay for on/off CO2 control ..ie for energising a fresh air fan.
To edit settings, press the fascia button labeled “
ENTER
” to have the LCD display
jump to the 1
st
menu item in the menu tree “
SET CLOCK
”, using the DOWN arrow
button scroll down the menu until “
X7 CO2 SENSOR CONFIGURATION
” is
displayed. To then enable this feature, Press the “
ENTER
” button followed by the
“
DOWN
” arrow button to change the “DISABLED” setting to ‘ENABLED”. Either
except the default settings of (Y1 damper output) start at 700 and range over 300
ppm or edit the values with the “
UP
” or “
DOWN
” buttons, press “
ENTER
” to confirm
settings. Note so as not to lose temperature control in extreme outside air
temperatures, O/A temperature limits can be set to inhibit full fresh mode due to
high CO2 levels when the outside air temperature is either to hot or too cold
(adjustable). In this menu set the high and low outside air temperatures where fresh
air mode output signal (due to CO2 control) should be restricted (factory settings
are: below 10c and above 35c), the now restricted CO2 generated Y1 output signal
is adjustable from 0 to 100% (factory setting is 50%).
