TM_s-MEXT_ME28relC_00_12_19_EN
Technical manual
TRANSLATION OF THE ORIGINAL INSTRUCTIONS
85
10
INTERNAL AIR FAN MANAGEMENT
10.1
INTRODUCTION
ATTENTION
Pay attention to the fans. They are kept on at reduced speed when the power is connected, even if the unit is switched off from the
terminal, and while the controller has not yet started, to ensure the dispersion of possible gas leaks.
The unit is fitted with EC radial evaporating fans. it is possible to adjust ventilation in two ways based on the cold request (settable using parameter P23.07):
•
STANDARD
•
MODULATING [default]
10.2
STANDARD OPERATION
Under normal operation conditions, the fan is operated always at the same speed, corresponding to the speed set by means of the user interface during testing.
P10.10-
P23.08%
P23.01
Cold Ramp (%)
Request to the
Master PAC-IF
card
0
Fan
100
Step no. 0
Step no. 11
P50.01 Cold setpoint
P50.01+P20.18 Cold
se differential
Figure 10-1:
Standard fan representation
10.3
Modulating FUNCTION
The ventilation is modulated based on the adjustment step requested to the Master PAC-IF013B-E card.
P10.10-
P23.08%
P23.01
Cold Ramp (%)
Request to the
Master PAC-IF
card
0
Fan
100
Step no. 0
Step no. 11
P50.01 Cold setpoint
P50.01+P20.18 Cold
se differential
Figure 10-2:
Modulating fan management representation
10.4
ECONOMY FUNCTION
There is also a function, called Economy, which consists of lowering the fan speed (at a given value) when no regulation devices are active (basically, when compressors,
heaters, humidifiers, etc. are not active).
The goal is to obtain energy savings, which may be remarkable if the device thermal load in the environment is arranged in different proportions depending on varying time
bands.
This function can be enabled in the fan configuration masks at the user terminal.
