Description Of Controls; Emergency Stop; Extended Machine Inactivity; Start-Up After Extended Machine Inactivity - Mitsubishi Electric s-MEXT-G00 Installations, Bedienungs Und Wartungsanleitungen

s-MEXT-G00
INFORMATION
Failure to comply with the procedures can cause bad operation of
the machine and the system as a whole, resulting in early
deterioration
5.2

DESCRIPTION OF CONTROLS

The various controls are shown below, with their descriptions and functions. These controls
are positioned on the electrical panel
DOOR LOCKING SWITCH
Door locking electric switch: opens and closes the power supply circuit.

OFF (0) the machine is not powered.

ON (I) the machine is powered
MICROPROCESSOR DISPLAY
Microprocessor: manages the operation process, with the possibility of setting parameters
and monitoring operating conditions.
The operating details of the machine and interfaces can be found in the User Manual.
5.3

EMERGENCY STOP

Considering that there are no directly accessible moving parts in the machine, there is no
need to install an emergency stop device.
In any case, if installed this device would not reduce the risk as the emergency stop would
be identical to the normal stop using the main switch.
5.4

EXTENDED MACHINE INACTIVITY

In case of extended machine inactivity (e.g. seasonal shutdown), the specialist Engineer
must:

carry out a leak test on the system

opening of the line circuit breaker

for installations with R32, keep the units powered up to guarantee continuous
circulation or, in the case of disconnection from the power supply, perform Pump
Down to drain the refrigerant out of the room and close the valves of the condensing
unit.
5.5

START-UP AFTER EXTENDED MACHINE INACTIVITY

Before starting the machine, carry out all the maintenance activities.
The specialist Engineer must also carry out adequate checks, calibrations and the start-up
procedure.
In case of R32 system, before opening the valves, power up the internal units in order to
grant the proper air flow. After the valves opening, use a sniffer to check for any leakage.
6

FIRST DIAGNOSTICS

6.1

WHAT TO DO IF ...

List of actions to be taken in case of unit fault.
Fault Cause
External
Check that condensation is not too
Mr.Slim
low (fan speed too high for the
condensing
external temperature)
unit
Condensation Check the external controller
control condensation signal
Check that the fan is turning
Check the speed reference signal
Check that the air flow is correct
Fan Check that the filters are clean
Low inlet
Check that the coil is clean
pressure
Check the cold air recirculation
from nearby units
Check that the thermal expansion
valve inside the condensing unit is
not jammed shut
Cooling Check that there are no
circuit obstructed/crushed capillary tubes
Check that the dehydrator filter
inside the condensing unit is not
obstructed
UM_s-MEXT_G00_01_Z_07_21_ML
Intervention
Solution
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Fault Cause
Setting
R32
refrigerant Faulty
leakage
Setting
Ambient Incorrect unit
selection
temperature
too high
Faulty
Setting
Incorrect unit
selection
Ambient
Faulty
temperature
too low
Hot
Resources
Cold
Resources
Setting
Incorrect unit
selection
Ambient
humidity Faulty
too high
Humidifier
Cooling
circuit
Setting
Incorrect unit
Ambient
selection
humidity
Faulty
too low
Humidifier
Setting
Low Air
Flow
Fan
7

MAINTENANCE

7.1

MAINTENANCE INSTRUCTIONS

OBLIGATION
Both regular and extraordinary maintenance activities must be
carried out by AUTHORISED TRAINED INDIVIDUALS equipped
with all the necessary personal protective equipment.
The machine site of installation must meet all the safety
requirements
The procedures set by the Manufacturer must be followed.
Before any kind of maintenance is carried out the following measures must be observed:

isolate the machine from the power supply using the yellow/red switch on the main
door, which can be padlocked in the "open" position;

hang a "Maintenance - do not switch on" sign on the main switch;

use appropriate personal protective equipment (for example: helmet, insulating gloves,
protective goggles, safety shoes, etc.);

use tools that are in good condition and be sure to be familiar with the instructions
before putting them into practice;

in case of unit with R32, take actions to ensure enough air flow in the room (by using
an external fan or opening the windows) in order to prevent any above-limit R32
concentrations.
27
TRANSLATION OF THE ORIGINAL INSTRUCTIONS
English
Intervention
Solution
Check that the liquid line is not too
small
Check for leaks
Check the refrigerant quality
Check that valves/taps are closed
Increase the cold setpoint
Increase the ventilation setpoint
Areate the room, avoid any
possible ingtion point (open fires,
sparks), warn the maintenance
Decrease the setpoint
Check that the machine is not
undersized for the thermal load or
the air volume handled
Check the probe reading
Check for alarms
Increase the setpoint
Check that the machine is not
undersized for the thermal load or
the air volume handled
Check the probe reading
Check for alarms
Check the power supply to the
heaters (if applicable)
Check the heater safety thermostat
Check the operation of the
freecooling damper (if applicable)
Decrease the humidity setpoint
Check that the machine is not
undersized based on the latent
load
Check the humidity probe reading
Check the operation of the
humidifier
Check that the thermal expansion
valve is working correctly
Increase the humidity setpoint
Check that the machine is not
oversized based on the latent load
Check the humidity probe reading
Check the operation of the
humidifier
Check the speed settings of the
fans
Check the air flow setpoint or the
delta P in case of variable
adjustments
Check the power supply to the fan
Check the analogue output of the
speed reference from the controller
Check the reading and positioning
of the differential pressure
transducer in case of variable
adjustments
Check for system load losses
Check the cleanliness of the unit
filters
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