Reflex Refexomat RSC, Operating Manual

Page: 22 / 70

Description of the device
Reflexomat with Basic controller — 20.06.2017 - Rev. C English — 13
4.4 Function
1 Water make-up with "Fillcontroll Auto" PIS Pressure sensor
2 Control unit SV Safety valve
3 Primary tank as expansion tank PV Solenoid valve
4 Secondary tank as additional expansion tank LIS Pressure load cell
WC Make-up line EC Expansion line
Expansion tanks
One primary tank and multiple optional secondary tanks may be connected. A diaphragm separates the tanks' interiors into an air and a
water space. preventing the ingress of atmospheric oxygen into the expansion water. The primary tank is connected to the control unit
downstream and connected hydraulically to the plant system. The pressure is protected at the air side by the "SV" safety valves of the
tanks.
Control unit
The control unit comprises one or – optionally – two "CO" compressor(s) and the "Reflex Control Touch" controller. Via the primary tank,
the pressure is measured with the “PIS" pressure sensor and the water level with the “LIS" pressure load cell and the values then
displayed in the controller display.
Maintaining pressure
• If the water is heated, it expands and the pressure increases in the plant system. If the pressure set at the controller is exceeded, the
"PV" solenoid valve opens and discharges air from the primary tank. Water flows from the system into the primary tank and the
pressure drops in the plant system until the pressure in the plant system and the primary tank is equalised.
• The pressure in the plant system drops when the water cools. When the pressure drops below the set value, the "CO" compressor
cuts in and delivers compressed air into the primary tank. This displaces water out of the primary tank into the plant system. The
pressure in the system rises.
Make-up
The addition of more water is controlled within the controller. The "LIS“ pressure load cell determines the water level and sends this
value to the controller of the pressure maintaining station. The controller actuates an external make-up device. Water is directly added
into the system in a controlled manner by monitoring the make-up time and the make-up cycles.
If the water level in the primary tank falls below minimum, a fault message is output from the controller and shown in the display.
Note!
For optional equipment for water make-up, see chapter 4.6 "Optional equipment and accessories" on page 14 .