
14 Product Overview 2596643-B_EN_2010_Condair GS_OM
Water Management
The humidier is equipped with a level control unit that monitors the water level in the tank. The tank
is supplied with water from the water supply, and from the secondary heat exchanger in CS models. A
vacuum break valve is used to prevent siphoning in the drain connection.
In the CS model, a secondary heat-exchanger promotes higher efciencies. This is achieved by using
the heat from the exhaust gas to pre-heat the cold ll water entering the tank.
The level control unit is connected to the top and bottom of the tank to monitor water level inside the
tank. The level control unit is equipped with a control board and consists of two magnetic oats (one is
the level oat and one is the safety oat) that measure the water level. The water levels in the tank are
indicated with 3 LEDs on the control board and are monitored by the control software.
Water Levels:
– L5 (yellow LED lights) – high water level
– L4 (green and yellow LED light) – intermediate water level
– L3 (green LED lights) – middle water level
– L2 (green and red LED light) – intermediate water level
– L1 (red LED lights) – low water level
On initial start-up, the dual ll valve lls the tank and the level control unit. A start-up test monitors the
water level as the tank and level control unit lls, and ensures proper functioning of the unit.
Note: A fault message "Float Level" may appear at any time. This indicates an invalid combination of
readings from the control software (for example, if L5 and L1 LEDs activate at the same time).
1. Water enters the level control unit via the hose connected to the tank The water level reaches rst
the safety oat, then the level oat.
2. As water lls the level control unit and reaches the L1 level, the control software performs a test to
verify proper functioning of the dual ll valve and the drain pump.
a) The ll valves lls the tank until the water level L5 is reached (detected by the level control unit).
b) Then, the drain pump energizes to lower the water level to just below L3.
Note: The water levels should appear in ascending then descending order; L1, L2, L3, L4, L5, L4,
L3. A fault message "Fill Check Fault" appears if the water level does not rise to level L5. A fault
message "Drain Check" appears if the water level does not drop below the level L3.
3. When the test is complete, the dual ll valve activates and the water level should rise to level L3.
4. If a demand signal is present, the humidier begins the combustion sequence.
5. The drain pump and dual ll valves maintain the water level between levels L2 and L5.
If "Float Check" is enabled during steam production, the control software will activate the drain sequence
every 24 hours (adjustable to any time of day) to verify proper functioning of the level control unit, dual
ll valve, and the drain pump.