AERMEC PXA I Gebruiks- en installatiehandleiding - Pagina 2
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Congratulations
for
thermostat.
Made
rules, the "PXA E" is easy to use and will be with you for many years to come.
The PXA I regulation thermostats are control panels for fan coils for
installation on the machine.
They control the fan coil functioning in accordance with the mode set, the
room temperature and the water temperature in the circuit to maintain the
set temperature in the room.
The panels must be used on four- or two-pipe plus PLASMACLUSTER
purifier systems with the possibility of connecting two On - Off valves
to cut off the supply of water to the
®
coils or one valve and a
air purifier.
Each control panel can control a
single fan coil.
The control panel only consists of
mains voltage (230V) electrical
circuits; all the inputs for the probes
and controls must therefore be
correspondingly insulated for this
voltage.
The valve servo commands must also
be scaled for 230V.
PXA meets the requirement of the
Low Voltage directives 73/23 (EN
60730-1, EN 60730-2-9, EN 60335-
1) and electromagnetic compatibility
directive 89/336 (EN 61000-4-1, EN
55011, 55022, 55014).
The panel may only be opened and
installed by specialised personnel.
Cut off the supply voltage before
removing the lid of the control panel.
Touching live components could
electrocute you. This is particularly
true also for the setting of contacts
on the Sw1 and Sw2 cut outs.
OPERATION
The thermostat's job is to keep the temperature set on selector (B)
constant in the room.
Frost Protection, with selector switch (A) in the OFF, position it
prevents premises that are uninhabited for long periods from falling
to temperatures below 7°C, which would make them difficult to heat
again when they are to be reused. If the fan coil is fed with warm
water it will start in AUTO until the room temperature is 9°C.
The Frost Protection function must be programmed by the installation
engineer.
All Off, selector (A) in the OFF position, the fan coil is completely off.
VENTILATION
In the two-pipe system, the thermostat makes it possible to enable
the heating ventilation only if the temperature of the water exceeds
35° or 39°C (programmable in the installation phase); in the same
way, the ventilation in the cooling mode is only enabled if the
water temperature is less than 17°C or 22°C (programmable during
installation).
Ventilation is delayed compared with the start and turn off
commands.
The functions described on the one hand prevent unwanted cold
ventilation in winter mode and, on the other, allow all the terminals
to come on and go off depending on the temperature of the water.
The ventilation mode is set with selector (A).
Manual mode (selector in position V1, V2, V3) the fan uses On-Off
cycles on the selected speeds.
Automatic mode (selector in AUTO position) the fan speed is
managed by the microprocessor of the PXA.
The delay between opening or closing of the warm water valve and
the turning on or off of the fan can last for up to 2' 40".
6
purchasing
the
PXA
with
top
quality
C
-
A
I Aermec
electronic
materials
rigourously
The panel comprises:
– (A) on-off selector switch and ventilation speed;
– (B) temperature selector;
– (C) blue / red/ fuchsia leds, operation mode (Cooling/ Heating/
Antifreeze/ Autotest)
®
– (D) yellow led, fan coil operation, Autotest.
B
D
+
AUTOMATIC CHANGE OVER AIR SIDE
The control makes it possible to automatically set the fan coil
functioning mode at heating or cooling.
- In the two-pipe no valve systems or those with probe up line
from the valve, the functioning mode change is determined by the
temperature of the water circulating in the system.
- In the four-pipe no valve systems or with probe up line of the
valve,the functioning mode change is determined by the temperature
of the water circulating in the plant if this is at a value higher than
the enabling threshold. If the temperature of the water circulating is
lower than the disabling threshold, the functioning mode change is
determined by the difference between the temperature measured in
the room and the set temperature.
- In two-pipe systems with probe downline from the valve and
in all the systems without water temperature probes, the change
of operational mode is determined by the difference between the
temperature measured in the room and the set temperature.
control
panel
with
abiding
by
safety
V1 = Minimum speed
V2 = Medium speed
V3 = Top speed