VDH MC3-SC, Manual, Page: 26 / 45

MC3-SC Stepped Controller
Document no.: 140744 version 1.3
Page 26 of 45
section 4.7).
P 601 When an external release contact is defined, the system waits for this period of time
after that contact has been made before opening the evaporator valve, e.g. when
combined with a flow sensor. When the contact is broken, the evaporator valve
closes immediately.
P 610 to
P 613
These parameters can be used to help calibrate the temperature sensors. If a sensor
registers 0.5°C too high, then this parameter should be set to -0.5 so that a correct
reading will be obtained.
P 620 Setpoint for the cooling thermostat. This can also be adjusted from the touchscreen.
P 621 Differential for the cooling. If the temperature differs from the setpoint by more than
this amount, the cooling will come on (and turn off again once it is below the
setpoint).
P 622 Delta-T for the suction side from the requested setpoint temperature. If the
thermostat is leading, the requested suction side will be this many degrees below
the setpoint.
P 623 Switch-on delay for the cooling. The temperature must be above the setpoint plus
the differential for this many minutes before the cooling comes on. This is for
example to enable a stepped cooling approach.
P 630 Time interval for which the fan comes on before the evaporator valve opens.
P 631 Time interval for which the fan continues to run after the evaporator valve closes.
P 640 When the defrosting sensor observes a temperature that is below this value, the
evaporator valve will be closed until the temperature has risen by one degree.
4.9 Production data
P 991 The software version of the controller’s internal software
P 992 The controller’s serial number
P 993 The controller’s production date