Functional Diagram; Acs Design And Operation - Vents PA 01W Operation Manual

Outdoors
Digital Input
Digital Output
Analogue Input
Analogue Output
Design. Designation
ATV1 Frequency Transformer.
Pump dry running relay.
DD1
Pressure safety switch on supply air lter.
PD1
Supply air lter.
F1
Supply fan.
M1
M2 Circulation Pump.
P1 Control panel.
Q1 Hydronic Coil Heat Exchanger.
Q2 Freon chiller.
SM1 Supply air damper actuator.
SM2 Three-way valve actuator.
TE1 Ambient temperature sensor.
Return water temperature sensor.
TE3
Heat exchanger freezing protection sensor.
TE4
TE5 Supply air temperature sensor.
Fig. 2
The ACS operates in two modes: «Heating» or «Cooling». The «Heating» or «Cooling» mode is
selected automatically according to the outdoor temperature. if the outdoor temperature is in excess
of Тперех. parameter value (as set from the controller menu, Тперех. parameter (see Table 2), factory
setting +5°С) the system runs in the «Cooling» mode whereas on temperature dropping below the
Тперех. threshold value the system switches to the «Heating» mode.
The fans are started and shut down using button (1) (see Fig. 10) on the control panel.
The air flow (fan speed) is set by button (3) also located on the control panel (see Fig. 10)
The controller activates and deactivates the water coil circulation pump, controls the heat-
transfer medium valve and opens and closes the ambient air damper automatically.
In the «Cooling» mode the ACS additionally performs the following functions:
When the fan is on the ACS maintains the supply air temperature at the pre-set level (set
from the control panel) by actuating the water coil valve;
On fan shutdown the ACS shuts off the water coil valve and closes the supply and exhaust
air valves.
autOMatiC COntrOl SYSteM (aCS) DeSiGn anD OperatiOn

FunCtiOnal DiaGraM

Indoors
CCU
5