Vapour Production Regulation; Cylinder And Line Initial Pre-Wash; Reset Cylinder Hour Counter; Dilution Drain - Mitsubishi Electric s-MEXT-G00 006 Technical Manual

TM_s-MEXT_ME28relC_00_12_19_EN
The immersed electrode humidifier produces vapour by heating cylinder water to ebullition. Vapour production regulation. Heat is obtained from the flow of electricity through
the water in the cylinder. This procedure is performed by applying voltage to the electrodes (network) immersed in the water.
Initially, when the cylinder is new or after it has been cleaned, the quantity of current almost exclusively depends in the type of supply water: the saltier the water, the more it
conducts current, and the earlier it reaches the required steam production level. Over time, the salt deposit in the cylinder increases (as it does not evaporate with the water),
contributing towards reaching nominal production.
At full capacity, the required production level is automatically maintained by adjusting the absorbed current and maintaining the water level in the cylinder.
The salt deposits that build up over time progressively exhaust the cylinder. To prevent excessive buildup, the humidifier periodically automatically discharges and replaces a
certain amount of water
8.2.2

Vapour production regulation

The production of vapour by the integrated humidifier constantly depends on the humidification demand according to ambient humidity adjustment.
The programme adjusts humidity according to the reading of the humidity probe, the humidity setpoint and the humidity differential. Using the PID control the humidity level is
taken to the "Humidity setpoint" value as quickly as possible. The production of vapour is proportional to the PID outlet demand.
The humidify setting parameter is under the "Set point" menu.
The range of values that may be set for the set point depend on the activation or deactivation of the dehumidify function. In particular:
•
Dehumidification enabled The maximum humidify set point is the dehumidify setpoint - 5%.
•
Dehumidification disabled The maximum humidify set point is 99%.
This avoids overlapping of the set points and not to have a dead zone on adjustment.
The humidify differential parameter (regulation band) is under the "Regulations" menu, which can be accessed by entering the "Service" password.
For the default values, see the parameters table.
The humidifier is enabled/disabled when demand (PID outlet) is 10% greater or lower. The maximum production of vapour (P0 parameter in the CPY controller module) is set
by default to 100%.
To change the maximum vapour adjustment set the relative parameters under the "Optional" menu, which can be accessed by entering the "Service" password.
8.2.3

Cylinder and line initial pre-wash

Allows to clean the water lines and cylinder, most importantly after the hydraulic connections and/or replacing the cylinder.
The cylinder is filled and emptied 3 times in order to remove any impurities present in the pipes and cylinder.
The lines and the cylinder can be pre-washed at any time, using the screen or using terminal M2.7.
Pre-washing using the screen:
1. Access the "Manual" menu by entering the "Service" password.
2. Enable manual operations on the humidifier.
3. Access the pre-wash start mask, without the serial humidification request.
The service also finds the manual discharge override command in the same mask.
Pre-washing via terminal M2.7:
1. Switch off the CPY board.
2. Short circuit M2.7 on M2.5.
3. Switch on the CPY board.
4. Pre-washing starts.
8.2.4

Reset cylinder hour counter

The reset can be performed in the following way:
1. Access the "Manual" menu by entering the "Service" password.
2. Enable manual operations on the humidifier.
3. Access the mask used to reset the cylinder operating hours.
The cylinder hour counter must be reset whenever the cylinder is changed in order to allow it to start rapidly.
8.2.5

Dilution drain

The humidifier drains and replaces automatically a part of water contained in the cylinder, in order to prevent excess concentration of salts following the evaporation process.
The drain valve is activated for a set time when internal conductivity exceeds the maximum limit. This situation is indirectly detected by calculating evaporation speed. The
electrodes are not powered during automatic draining to ensure the drained water is not live.
8.2.6

Periodic drain

It is recommended that this function is enabled through parameter P27.16 when using water rich in substances such as humus and slit. The humidifier drains and
automatically replaces the water in the cylinder to prevent the accumulation of these substances. The function requires the humidifier to drain and replace the water in the
cylinder after 24h (P27.17) of continuous operation (continuous production of steam).
The parameters for enabling and configuring the function are in the "Optional" menu, which can be accessed by entering the "Service" password.
8.2.7

Drain due to inactivity

When the function is enabled, using parameter P27.18, the humidifier drains all the water in the cylinder after 3 days (P27.19) of inactivity (not producing steam) to avoid
stagnation and hygiene risks.
The parameters for enabling and configuring the function are in the "Optional" menu, which can be accessed by entering the "Service" password.
8.2.8

Alarm management

The terminal displays the active alarms.
Technical manual
TRANSLATION OF THE ORIGINAL INSTRUCTIONS
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