EVCO EC6708 - Manual (Page 12)

Every Control S.r.l.
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FUNCTIONING
Manual power steps loading/unloading - Condensing quantity regulation
To load/unload manually the power step:
d) if the actual status of the power step is OFF keep pushed for
four seconds at least the up key (passed four seconds the
instrument displays On, the new status of the power step) ...
d’) ... if the actual status of the power step is ON keep pushed for
four seconds at least the down key (passed four seconds the
instrument displays OFF, the new status of the power step)
e) after the modification push and release the set key (to the
release of the set key the instrument displays the label St 2
again).
To turn out from the manual power steps loading/unloading proce-
dure:
f) repeat the passage n or n’ of the chapter Configurator Menu
on the page 25.
Additional informations
• the manual unloading of the power step of a choked compres-
sor gives the unloading of the power step of the respective
choking valve.
CONDENSING QUANTITY REGULATION
Condensing quantity regulation happens through the condenser fans.
The parameter F A establishes the condenser fans functioning: it is
function of the quantity read by the condensing probe (in this case the
instrument automatically divides the proportional band in equal frac-
tions according with the number of relay outputs associated to the
condenser fans, for instance 4, it activates the condenser fans with
sequence every time the quantity read by the condensing probe rises
above the condenser fans activation setpoint of a fraction of propor-
tional band and it deactivates them with sequence when the quantity
read by the condensing probe falls below the value to which the
activation happened of a fraction of proportional band) ...
... or function of the power steps loading/unloading (in this case a
power step loading/unloading gives the automatic activation/deacti-
vation of a condenser fans).
The parameter F d establishes the method used by the instrument to
compute which condenser fans to activate or deactivate: with fixed
sequence (in this case if the users associated to the outputs K5, K6, K7
and K8 are condenser fans, the instrument activates them beginning
from that associated to the output K5 and it deactivates them with the
reversal method) or balancing the total working hours (in this case the
instrument activates the condenser fans with sequence beginning from
that with the lower number of total working hours and it deactivates
them with the reversal method).
Speaking of condensing quantity regulation
• the parameter Hr 1 ... 8 permits to display the total working