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AB Industrietechnik srl – Via Julius Durst, 70 – 39042 BRESSANONE (BZ) Italy – Tel: +39 0472/830626 – [email protected] – www.industrietechnik.it
With heating recovery conditions:
If temperature of regulation sensor drops below WHS, the on/off bypass damper is deactivated (with
183
=0), icon is
switched on, the modulating rotary heat exchanger changes speed from the minimum to maximum when Treg changes from
WHS to (WHS -
178
).
The modulating rotary heat exchanger reaches its minimum speed if Treg >= WHS:
- with
183
=0 minimum speed of modulating rotary heat exchanger is equal to 0. The bypass is activated if Treg >= (WCS +
178
), icon
is switched off,
- with
183
≠
0 minimum speed of modulating rotary heat exchanger is not equal to 0, icon is switched off and the bypass
remains OFF.
During operation, the ON or OFF icons indicate the status of the heat exchanger:
Icon status
Indication
ON icon is on
Rotary heat exchanger running, heat recovery in progress
OFF icon is flashing
Rotary heat exchanger stopped for free heating or free cooling
OFF icon is on
Rotary heat exchanger stopped, heat exchanger off
By Modbus, it is also possible to see the status of the heat exchanger (see
“41. Modbus (for AHU-xMxSx1 models)” page 137
).
Note
:
Frost protection of heat exchanger is considered for rotary modulating heat exchanger. If a frost protection of heat ex
-
changer occurs, the rotary modulating heat exchanger is forced to run at maximum speed;
If parameter 1
86
≠ 1 and 3, on/off bypass is forced to OFF.
If parameter
186
=1 or 3, on/off bypass is forced to ON.
