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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 set 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:
•
simulate a fan fault by stopping a fan; check that the
pressure switch intervenes;
•
if the pressure switch does not intervene, gradually
increase the setting until the pressure switch switches
off:
- using an adjustment screw, set the differential pressure
switch on a scale from 0.5 to 4.0 mbar (from 50 to 400
Pa).
MAINTENANCE
Three-monthly checks
Carry out the following checks every three months:
•
check the power supply;
•
check the alarm status;
•
check the working temperatures;
•
check the correct operation of the local/remote controls;
•
check air filters, eventual cleaning or replacement;;
•
check the efficiency of the condensing drain;
•
check the steam cylinder is clean, replacing it if
necessary.
Six-monthly checks
Carry out the following checks every six months:
•
repeat these checks on a three-monthly basis;
•
check and clean if necessary the cooling coil;
•
check the operation of the humidifier (if present: see...)
Annual checks
Carry out the following checks annually:
•
repeat these checks on a six-monthly basis;
•
check the varnish and the nuts and bolts
•
check the hinges, rabbets and gaskets
•
check the cables and wiring
•
tighten the terminal blocks
•
check and reset if necessary the safety device settings
(pressure switches, thermostats, protection devices);
•
check the operation of the post heating electrical heaters;
•
check the fittings, operation and absorption of the fan/s
motor;
•
check and if necessary reset the regulation devices
setting;
•
check and if necessary replace the seal of the hydraulic
circuits/s and tighten the unit couplings;
•
check and reset if necessary the water regulation valve/
valves setting.
•
ripetere i controlli semestrali.
WARNING! Before removing the internal
protection panels, disconnect the power supply
by turning the main isolating switch D5 to
position "O", then wait until the fans stop and
the electrical heaters cool down.
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.
