Dehumidification Setpoint Limit; Humidify; Introduction; Integrated Humidifier - Mitsubishi Electric s-MEXT-G00 006 Technical Manual

TM_s-MEXT_ME28relC_00_12_19_EN
7.3

DEHUMIDIFICATION SETPOINT LIMIT

Limits for the humidification and dehumidification setpoints are set on the controller to ensure correct operation of the humidification and dehumidification functions.
In particular, the dehumidification setpoint should always be:
Greater than or equal to the Humidification setpoint + 5% (fixed ready-only value).
Greater than or equal to the minimum limit for the dehumidification setpoint.
The first condition permits the creation of a dead zone between the dehumidification and humidification logics. This condition is considered only if the unit is configured to
work with complete humidity control (with humidification and dehumidification).
The second condition is always present if the unit is configured to control dehumidification and protects the unit by preventing it from working in conditions of low humidity -
conditions that could cause the unit to run at low evaporation temperatures.
Operation in the two conditions described above can be summarised with the chart below:
Differential P20.21
Minimum dehumidification setpoint
The Dehumidification and Humidification setting parameters are under the "Set Point" menu. The Dehumidification and Humidification differential parameters are under the
"Regulations" menu, which can be accessed by entering the "Service" password.
The Dehumidify set point minimum limit parameter is under the "Safety" menu, which can be accessed by entering the "Factory" password.
OBLIGATION
All changes made to the minimum limit of the dehumidifcation setpoint must be authorised by MEHITS who will provide the new minimum value to be
set for the single unit in use.
8

HUMIDIFY

8.1

INTRODUCTION

The software allows the humidification to be performed by the integrated humidifier installed on the unit.
Activating the humidify device is enabled:
1. After regulation consent.
2. If there is no humidity probe alarm.
3. If the humidifier has not been temporarily disabled for maintenance.
8.2

INTEGRATED HUMIDIFIER

In case of built-in humidifier, disabling may also occur in the following cases:
•
If the network communication (serial RS485) is interrupted, CPY stops the KUE unit by opening the contactor, and then remains on standby without producing
steam, and the "Humidifier Offline" alarm is displayed.
When communication with the external controller is reinstated, CPI automatically meets the demand of the external controller, and the alarm disappears.
•
When the driver M2.4 and M2.5 (enable) contact is opened.
8.2.1

Operating principle

The integrated humidifier belongs to the steam humidifier category, and, in particular, consists of an OEM Carel immersed electrode humidifier.
Configure the type of humidifier in use under the "Optional" menu that can be accessed with the "Service" password.
INFORMATION
The relationship between the value of the parameter and the set type of cylinder is described in annex C.
Technical manual
Dehumidification setpoint limit depending on
the HUMIDIFICATION setpoint
Humidify
P50.04
5% fixed
P14.10
Figure 7-8: Chart of management of the limit of the dehumidification setpoint
Dehumidify
P50.03
Differential P20.20
TRANSLATION OF THE ORIGINAL INSTRUCTIONS
82
RH (%)
ambient