Mandik Climatix, Operating Instructions Manual

Page: 29 / 83

KJM MANDÍK
–
Detailed operating instructions
M&C KJMPNO 07/2022
MANDÍK, a.s.,
www.mandik.cz
29
specified in the frequency converter parameters. Therefore, the run-out values should be
the same.

Speed (%,%,%) – speed values for three-stage fan speed control by external contacts.
ModeSwitches = 3xSpeed must be set in the configuration.

MinSpeed (36%) – used to protect the motor against thermal overload when operating at
speeds lower than 18 Hz for long periods of time (36% is for the rated speed of 50 Hz).
This applies mainly to frequency converter controlled motors.

MaxSpeed (100%) – used to limit the fan power to prevent the individual Comfort and
Economy regimes from setting fan power in excess of their operating point according to
the unit's technical specifications. A bigger amount of supply air can cause, for example,
incorrect operation of the manostats (exceeding the pressure drop) of filters,
recuperator, etc.

Delay (30 s) – delay of the supply fan switching on after the exhaust fan switching on. This
function is particularly important in a recuperator configuration where the warm air
supplied to the recuperator by the exhaust fan heats the recuperator before the supply
fan starts.

Release (1 to 31) – indication that the conditions for starting the AC unit fans have been met.
The value is given by the sum of the weights of all the 5 conditions with weights of 1 to 16.
The weights of the conditions needed to start the fans are in Tab. 1.
Condition Weight Condition description
1 1 There is no fault blocking the operation of the fans.
2 2
One of the operating regimes is selected ( Comfort ,
Economy , Tempering , or Freecooling ).
3 4
Unit operation is not blocked by another component
(service switch, boiler room, air flow sensor, etc.).
4 8
Standard operating requirement to turn on the fans
(
Heat , Cool or Ventilate ) that is not blocked by too low
or high supply air temperature.
5 16
Forced on fans with a higher priority than the standard
operating requirement (unit ventilation, poor air quality
or humidity, etc.).
Table 1 - Fan start release

Release < 15 – Fans are not running, all the necessary conditions are not met.

Release = 15 – Fans are running, all the necessary conditions are met.