flamco FlexFiller Direct G4, Installation And Operating Manual

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Manual FlexFiller Direct G4
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6 Product description
The FlexFiller Direct G4 is the most compact, wall-mounted, pressurisation unit in the portfolio. The
function of this pressurisation unit is to provide a means of automated water filling and top-up to
sealed heating and cooling systems. The equipment is designed to provide periodic water top-up to
compensate for minor losses in system pressure (e.g. slow leaks, air venting, etc.).
The FlexFiller Direct G4 is the latest in pumpless digital pressurisation technology for light
commercial and residential buildings. It’s a slim, wall-mounted pumpless top-up pressurisation unit,
with a top-up flow rate of up to 14 l/min depending on the mains or boosted mains, water pressure.
It is designed to be connected directly to a building’s incoming water supply using the included
flexible hose. It is there to fill and maintain the pressure of a heating or chilled water system without
the need for a pump.
This equipment is not designed to cope with sudden, substantial, losses of system
pressure (e.g. manual draining) or major water losses (e.g. large leaks). The equipment is
also not intended to be used for water boosting (potable) applications.
6.1 Operating principle
The following schematic shows the internal arrangement of the pressurisation unit:
1. Water enters the unit via the mains connection, isolation valve (IV) and through the back-flow
preventor.
2. Pressure sensors (P1 & P2) monitor the pressure in the mains water supply system and in the
heating or cooling system.
3. A solenoid inlet valve (S1) and a drain valve (S2) are activated when topping up is required.
4. The automatic air-vent (AAV) removes free air before it enters the sealed heating system.
5. Once the top up cycle is finished, the remaining water in the unit is removed by opening of the
drain valve (S2), to prevent legionella build up.
6. A filter on the mains supply to the unit is already installed. Where debris from the supply pipe is
expected, it is recommended to install an additional filter or Y-strainer on the mains water supply to
the unit.
Mains
System
Drain
AAV
IV IV
P
1
P
2
S
1
S
2
Icon Description
IV Isolation valve
P1 Pressure sensor to measure
mains water pressure
P2 Pressure sensor to measure
heating system pressure
S1 Valve to control mains water
inlet, normally closed (NC)
S2 Valve to control drain outlet,
normally open (NO)
AAV Automatic float air vent
Y Tundish