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Setting the regulation and safety devices
After starting up the unit, set the following set points (see
the microprocessor control manual):
•
Room temperature (cooling and heating set point);
•
Relative room humidity (humidification and
dehumidification set point);
•
Dirty filter differential pressure switch: see paragraph
"Setting the dirty filter sensor".
The settings of the safety devices must not be modified.
R410A
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Maximum and minimum water temperatures
The maximum and minimum water temperatures for chilled
water circuits and for hot water re-heat circuits are: 5°C ÷
90°C.
The accepted maximum amount of ethylene glycol is 50%.
Setting the pressostatic valve (optional on
chilled water cooled models only)
The pressostatic valve, by controlling the water flow, prevents
the condensing pressure falling too low and at the same time
minimises water consumption. When necessary, set the
pressostatic valve by turning the regulation knob (the pressure
increases when turning it clockwise) until the condensation
pressure stabilizes to recommended* checking the pressure
with a gauge fitted to the pressure tapping of the compressor
discharge valve.
* R410A :pressure 26 bar = temperature 45°C
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Setting the air flow sensor
The FS differential pressure switch intervenes if the fan (or
one of the fans) stops working.
The factory set point of the FS differential pressure switch is
at 0.5 mbar (= 50Pa).
As the difference in pressure between the suction and
discharge of the fans depends on the air flow, it may be
necessary to calibrate the instruments after installation,
checking that the contact closes when the fans are in
operation.
To set the FS pressure switch, carry out the following proce-
dure:
t e
•
simulate a fan fault by stopping a fan; check that the
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pressure switch intervenes;
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•
if the pressure switch does not intervene, gradually
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increase the setting until the pressure switch switches
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off:
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- using an adjustment screw, set the differential pressure
switch on a scale (from 0.5 to 4.0 mbar - from 50 to 400
Pa).
Setting the dirty filter sensors
The PFS differential pressure switch is set according to the
loss of load dependent on the dirt inside the filters and the air
flow.
The PFS differential pressure switch must be set at 3 mbar
(=300 Pa).
To set the PFS pressure switch, carry out the following pro-
cedure:
•
gradually cover the surface of the air filter and check
that the pressure switch intervenes when the filter is about
50-60 % covered;
•
if the pressure switch does not intervene, gradually lower
the setting, if it cuts in too soon, increase the setting:
- using a star screw driver turn the regulation screws of
the pressure switch to the desired value.
27
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Troubleshooting
