Valve Operation - AERMEC AER503IR Manuel D'utilisation Et D'installation

VALVE OPERATION

If a shut-off valve is installed (
position of the probe can be managed both
upstream and downstream of the valve itself
(on the standard position available in the heat
exchanger). The difference between the two
options lies in how ventilation is managed. If
the water probe is upstream of the valve (
2=1) or is not installed, there is an exchanger
pre-heating function that enables the fan 2'40''
after the first opening of the valve.
If the thermostat uses continuous ventilation, the valve operating logic is as shown below:
The AER503IR thermostat, in the 2 pipe fancoil control configuration (P05 = 0 or P05 = 2), can control, via the DC2 output, a modulating valve (in
the case of a 4 pipe fan coil this output will not be active), the voltage profile of this analogue output is described in the figures below:
Valve control logic with thermostat ventilation
HEATING SETTING
SET CALDO
100%
DEAD BAND
ZONA MORTA
Y1: 2 pipes Y1: 2 tubi
Y2: 4 tubi
Y2: 4 pipes
1.2°C
°C
1.0°C
1.8°C
The valve in question (for the heat exchange
pre-heating function) is Y1 in the case of a 2
=1), the
P0
pipe system (
1
of a 4 pipe system, it is Y2 (
inhibition time is then calculated automatically
according to how long the valve has remained
closed; in this way, it can vary from a minimum
of 0' 00'' to a maximum of 2' 40'' . This ventilation
P0
enabling delay in relation to the opening of the
valve is reset if the electric heater is enabled,
the purpose being to guarantee greater safety
for the user.
The figure below indicates the valve operating
logic if the thermostat is used with thermostat-
Heating setting
Valve
Valve
COOLING SETTING
SET FREDDO
Y1: 2/4 pipes Y1: 2/4 tubi
0.5°C
°C
0.7°C
1.2°C
=0) whereas in the case
P0
5
=1). The fan
P0
5
Cooling setting
Dead band
Heating setting
Cooling setting
Dead band
Valve control logic with continuous ventilation
HEATING SETTING
SET CALDO
100%
Y1: 2 pipes Y1: 2 tubi
Y2: 4 tubi
Y2: 4 pipes
1.0°C
1.8°C
controlled ventilation logic or modulated logic.
As you can see, in HEATING mode the valve is
used by exploiting the capacity of the terminal
to dispense heat even when ventilation is
disabled (stack effect). On the one hand, this
takes advantage of the stack effect, and on the
other it avoids the continuous opening and
closing of the valve (that takes a few minutes
to respond), which means the water in the
terminal is always circulating during normal
operation.
In COOLING mode, thermostat control of the
valve is not synchronised with that of the fan.
This helps take full advantage of the cooling
capacity of the machine, and ensures more
precise room temperature control.
Valve
Valve
COOLING SETTING
SET FREDDO
DEAD BAND
ZONA MORTA
Y1: 2/4 pipes Y1: 2/4 tubi
0.7°C
1.2°C
25