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10.4 External T+H Probe
This probe is available for all the units.
It also allows the reading of the external temperature and humidity.
Probe 1 is connected via Modbus to the Fieldbus port defined using the parameter of the controller at address 133.
11 INTERNAL AIR FAN MANAGEMENT
11.1 Introduction
The unit is fitted with EC radial evaporating fans. It is possible to adjust the ventilation in two ways based on the cold request
(settable using parameter P23.07):
•
Standard.
•
In modulation (set by default).
11.2 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.
11.3 Modulation operation
Under normal operating conditions, the fan modulates based on the demand to the inverter compressor.
In case of S-MEXT units, the ventilation is modulated based on the adjustment step requested to the Client PAC-IF013B-E.
11.4 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 economy function is only possible if the modulation function is 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.
Version 38
P23.01
P10.10-
P23.08%
Step no. 11
Step no. 0
0
P50.01 Cold setpoint
Figure 11-1: modulating fan management representation.
Fan
Request to the
Client PAC-IF card
Cold ramp (%)
100
P50.01+P20.18 Cold
setpoint + differential
158
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