POLA Xfarm User Manual

44
D. Installation - Ventilation
Air-exchange (works on Step 0 of ventilation).
Inside the Exchange band, starting from a minimum % percentage, the program will switch programmed
Step (Step Air Exchange) of ventilation with On-Off time duration calculated according to indoor
temperature.
Working time will be increased according to temperature to reach the complete ventilation step capacity,
until to Exchange max. %.
i.e. when considering the following sets:
- Ventilation = 28.0° (see par. C.1)
- Air exchange = 10%
*3
(see par. C.1)
- Cycle duration = 10
m
.00
s
- Exchange band = 1.0°
- Exchange max. % = 100%
- Step Air Exchange = 1
The system will work as follows:
- Below 27.0° (28.0° Ventilation Set - 1.0° Exchange band) the ventilation step 1 (Step Air
Exchange=1) will work 1 minute every 10 minutes of the cyle (10% of Cycle duration).
This for any temperature below 27.0°.
- When T = 27.1° Step one will work 2 minutes and will pause for 8 minutes (Cycle duration= 10
m
);
for every 0.1° increase in temperature the “On working time” will increase by 1 minute and the “Off
working time” will decrease by 1 minute accordingly (being the cycle duration still 10
m
) to reach 10
m
(100%) of “On working time” at 28.0° (Ventilation Set).
The max percentage can be limited (Exchange max. %).
When setting Exchange max. % = 0 the “On working time” is kept fixed as per value Air exchange
programmed in Settings>Climate (par. C.1).
- Beyond 28.0° (Ventilation Set) Step 1 is always on.
*1
This value (as set in Settings>Climate, see par.C.1) can be influenced by the outdoor temperature,
see par. D.1.3.8.3.
Working structure of “Air-exchanges” in ON-OFF Normal Ventilation Mode
100%
75%
50%
25%
0%
ON ON
Time cycle
Time cycle
ON ON
Time cycle
OFF
ON
*1
*1 Relay output in the time
OFF
OFF
ON ONOFF
STEP 0
VENTIL.
Maximum % controlled by
Exchange maximum %
Exchange band
STEP 1
VENTIL.
Ventilation temperature probe
Step 1 relative set
Minimum % controlled by
Air exchange %
*1
Set referred to the
Ventilation set
*1
Minimum time on the relay=
Minimum on. The relationship time
On / time Off is calculated every 0.1°
of the Exchange band.

POLA Xfarm Specifications

General

Brand	POLA
Model	Xfarm
Category	Controller
Language	English