AERMEC WMT21 Manuel D'installation page 59

DESCRIPTION OF EXTENDED CONFIGURATION PARAMETERS
The extended installer configuration parameters are shown in table 2 and
explained below.
C01 and C02: These parameters define the thresholds for the automatic
changeover function: if the function is not used this information is not
applied.
The C01 parameter represents the lower threshold, while C02 represents
the upper threshold.
C03 and C04: These parameters set the proportional band amplitude
when in heating and in cooling mode respectively.
These paramaters can be set in the range shown in the table, yet the lower
limit could be higher, being related to the hysteresis value stored in P19.
C05 and C06: these parameters are used to set the integral time
respectively for regulation in heating mode and in cooling mode.
When set to zero no integral action is performed.
C7 and C8: respectively represent the minimum power percentage of the
heating and cooling proportioning valve.
The minimum power is the opening percentage of the proportional valve
below which the fan is kept off to avoid that the fan blows when the valve
has not yet opened the water flow.
C09: Sets the number of speeds of the fan motor used in the system.
Typically Fan motors are 3 speeds type, but this parameter allows 1 and 2
speeds motors to be managed also.
C10: Determines which fan speeds can be set with the " " button.
In certain installations it may be necessary to limit " " button function.
Table 3 shows the available combinations.
C11, C12 and C13: When the fan is controlled via the proportional output,
these parameters define the speeds associated with fixed speed settings
1, 2 and 3.
These parameters are not used if the fan is controlled by the relays.
C14: When the fan is controlled via the proportional output, this parameter
defines the minimum speed that should be maintained when the electric
heater is on in an electric heater system (P01=2 or 3).
C15 and C16: They represent the lower and upper limit of the fan's
proportional output signal. The parameters can be edited within a range
of 0.0 .. 10.0 V.
With these parameters the output voltage can be customized which is
useful to limit the minimum and maximum speed of the fan's motor.
C17, C18 and C19: These parameters allows to set which function must
be associated to the 3, 4 and 16 inputs.
Table 4 shows which functions can be associated to each input. It is the
installer's responsibility that each function is not associated to more than
one input.
See the "External inputs - terminals 3, 4 and 16" section for further
information.
C20: Determines which operating modes can be set with the button
" ". In certain installations it may be necessary to limit button " "
function.
Table 5 shows the available combinations.
C21: This parameter configures the integration "∆ set point" of the
electric heater system.
See the "Integrating electric heater system" section for further
information.
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