Internal Air Fan Management; Introduction; Standard Operation; Modulating Function - Mitsubishi Electric s-MEXT-G00 006 Technical Manual

TM_s-MEXT_ME28relC_00_12_19_EN
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.
10.3

Modulating FUNCTION

The ventilation is modulated based on the adjustment step requested to the Master PAC-IF013B-E card.
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.
Technical manual
P23.01
P10.10-
P23.08%
Step no. 11
Step no. 0
0
P50.01 Cold setpoint
Figure 10-1: Standard fan representation
P23.01
P10.10-
P23.08%
Step no. 11
Step no. 0
0
P50.01 Cold setpoint
Figure 10-2: Modulating fan management representation
Fan
Request to the
Master PAC-IF
card
Cold Ramp (%)
100
P50.01+P20.18 Cold
setpoint + differential
Fan
Request to the
Master PAC-IF
card
Cold Ramp (%)
100
P50.01+P20.18 Cold
setpoint + differential
TRANSLATION OF THE ORIGINAL INSTRUCTIONS
85