T9901018-1
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no moisture forming on the surface of the cooling coil after at least 15 minutes of
operation at 10°C water flow temperature.
NB
. If the outdoor unit has just been switched off via the controls it will require a few
minutes to start cooling again after the controls switch it back on.
If necessary adjust the angle of the outlet grille louvres in the air discharge of the dry
cooling unit to suit the air stream required in the room. Take care not to push objects
into the outlet grille.
Using the Siemens RDG400 manual room control take a mental note of the room air
temperature displayed on the screen and rotate the knob on the manual room control
clockwise and set the target temperature to above the room temperature. Check that
the water pump(s) and outdoor unit switches off. The fans in the dry cooling unit will
stay on.
Set the knob of the Room Over Temperature Alarm very high and using a multimeter
check that contacts 10 to 11 go open contact. Set the knob very low and check that
contacts 10 to 11 then go closed contact. Then set the knob to the setting that is
required by the operator to indicate there is a room over temperature alarm situation.
If a condensate disposal system has been installed check that it
operates correctly by filling the drain tray with some water and that
the water completely drains away from the unit. If a condensate
pump is being used ensure this is operating correctly and if possible
simulate a pump alarm fault condition to check that the alarm will
function. Some condensate pumps may require distilled water to do
this working test.
Switch off electrical power to the Thermoscreens dry cooling unit and the Mitsubishi
Electric outdoor unit. Replace the bottom access panel, air inlet grilles (with air filters)
and plastic end caps (see ‘To gain access inside the Dry Cooling Unit’, page 9). Switch
electrical power back on to the dry cooling unit and the outdoor unit and fully test all
operating parameters as above using the Siemens RDG400 manual room control.
Hand-over to End-User
Before leaving site it is important that there is a 'Hand-Over Meeting' to hand-over the
dry cooling system to the end user or their representative. This should include a full and
clear explanation of how the system operates and a demonstration showing the dry
cooling system running. Be sure to explain that the air inlet grilles and the air filters
inside the grilles must be regularly vacuum cleaned and the unit serviced at regular
intervals.
Fully explain and demonstrate the operation of the Siemens RDG400 Manual Room
Control. Also the remote On/Off, room over temperature alarm & Mitsubishi error signal,
if used. Explain that the fans in the Thermoscreens dry cooling unit can be switched off
in an emergency at the local electrical On/Off Switch/Isolator to the dry cooling unit.
Ensure that all instructions and manuals are handed to the end user or their
representative.
Fill tray with water
