Condair Dual 2 manual.pdf

3.2 Function
Spray valve Y6
Spray valve Y7
Capacity [%]
100
0
0
0
From the reversing osmosis system (RO system) the fully demineralized
water (also called permeate) is fed to the booster pump (9) via a shut-off
valve (7) and a filter (8). Depending on the current output requirements the
booster pump increases the water pressure to the required operating
pressure of approximately 7 bars (yield load).
From the booster pump the fully demineralized water is fed to the connector
box (16), either directly (on systems for exhaust air cooling) or via the silver
ionization unit (12) which degerminates the water.
If humidification is required, one or both spray valves (18) of the connector
box are opened, depending on the current humidification requirements (if
the optional third spray valve is available, the system opens one, two or all
three valves at a time).
The fully demineralized water is now fed to the respective spray nozzles
(21) producing fine aerosol fog. The air passing by the nozzles absorbs the
aerosol fog thus getting humidified. Aerosol fog not absorbed by the air is
retained in the post-evaporation elements (20) thus humidifying the air
passing through the post-evaporation elements. Excess water is flowing
down to the bottom of the post-evaporation elements and is led to the
siphon trap (19), via the drain in the water tub.
Control
The system is controlled by an external controller or by the PI controller built
into the control unit.
The standard system with a 2-valve connector box provides a 3-step
control corresponding to 1/3, 2/3 and 3/3 of maximum output. The first valve
opens at approximately 20% and the second one at approximately 50%.
If the humidification requirements reach approximately 80% both valves
are open.
Note: systems equipped with the optional third valve provide 7-step control
with respective humidification power.
Step 1 to 3
0 1 2 3
1
0
0
1
1
1
0 20 50 80 100
Control signal [%]
Spray valve Y6
Spray valve Y7
Spray valve Y8
Capacity [%]
0 1
Monitoring
The system continuously monitors the minimum and maximum pressure,
the conductance of the fully demineralized water, and the temperature of
the booster pump. If the conductance of the fully demineralized water
exceeds the admissible range (max. 15 µS/cm), the drain valve (14) of the
connector box opens and the water system is flushed until the conductance
meets the preset value. An error message is displayed if the conductance
value does not reach the admissible range within a certain period.
100
0
0
0
0
1
0
0
2
0
1
0
Step 1 to 7
3
0
0
1
4
1
1
0
5
1
0
1
6
0
1
1
7
1
1
1
0 15 27 39 51 63 75 87 100
Control signal [%]
9