RH CGS-240, Manual

Page: 63 / 148

Subsystems
CGS-240 Manual 6/15/2021
Page 63 of 148
While the initial fill of a new system may require up to 2 liters of distilled
water to reach the desired presaturator water level needed, ongoing
water usage by the system is rather low.
The tank may be refilled (or topped-up) at any time, even while the
system is running. The distilled water supply tank should always have a
minimum level of at least a few inches (several centimeters) of water,
keeping the suction tube inlet below the water level.
It is the operators responsibility to ensure that there is sufficient water in
this supply tank at all times. When full, there is sufficient water for at
least 24 hours continued operation at the highest temp/humidity
generator conditions.
Use of deionized water is not recommended as it tends to be ionically
aggressive to stainless steel and may cause pitting of the presaturator
and saturator. Distilled water, even that which is purchased at local
grocery or discount stores, is generally preferred over deionized water.
6.3.2 PRESATURATOR LIQUID LEVEL SYSTEM
The presaturator liquid level system maintains the water level within the
presaturator. This is done automatically utilizing an electronic tube liquid
presence sensor, a high-pressure pump, P2, and a liquid level sensor
within the presaturator, When activated, the pump P2 pulls water from
the distilled water supply, through a suction tube, past the tube liquid
presence sensor and into the high pressure pump P2. Water is pressurized
through P2 and enters the presaturator. Since this high-pressure pump
can fill the presaturator while the system is generating humidity, the
system can operate for extended periods without the need to shut down.
The water level of the presaturator is detected by the ECB with a
conductivity measurement of the liquid level probe, LLP, which is
connected to ANALOG LEVEL INPUTS - LVL 4. This circuit converts the
conductivity analog signal to a digital signal level and routes it through
jumper 4 to the digital LEVEL INPUTS
– LVL4 to be sensed by the ECB
software. An LED at LEVEL INPUTS - LVL4 indicates a low water level
when ON.
This low presaturator water level is sensed by the
ECB software which then activates the high-
pressure pump, P2, by creating a 24 VDC square
wave on DC CONTROL - RLY 4. The square wave
sequentially activates/deactivates the solenoid of
P2 causing it to pump water into the presaturator.
When water is detected at the preset liquid level
sensor, the LED turns off.
Figure 6.16
Figure 6.18
P2
LLT
Figure 6.17
LLP