English
INTERCONNECTED CONVEYANCES
Return conveyance
Supply conveyance
Rubber
hose
Main
circuits
40mm
40mm
2%mini
16 SYSHRW
11.2. RECOMMENDATIONS FOR CLEANING AND FLUSHING OUT THE SYSTEM
1. Before commissioning an appliance for the first time, the water loop must be cleaned and rinsed out
to remove any dirt and manufacturing debris.
If the appliances are equipped with isolation valves (either electric or pressostatic), the water supply
and return conveyance circuits to and from each machine must be connected to each other. This will
avoid any dirt being introduced into the units.
Flushing water through the units is acceptable if they are
not equipped with water flow control devices.
2. The system must be filled from the mains water supply. All
air bleeds must be open during filling. Close the air bleeds
once the system is filled.
The installer must start the main circulation pump with the
water top-up tap on the pressure reduction valve in the
open position. Check the air bleeds by increasing order of
height to ensure water flows freely throughout the entire
system.
Power supply to the cooling tower must be shut down,
and the water loop temperature regulation thermostat
must be set at 27 °C.
As the water circulates through the system, the installer
must seek out and repair any possible pipe work leaks.
The drain cocks, on the lowest points on the circuit, must be open for flushing out and chasing out
any impurities. Ensure that the mains water valves are adjusted to allow water to enter at the same
speed as it exits. Check the pump inlet pressure gauge and manually adjust the compensating valve
to maintain the same pressure before and after the opening of the drain taps. Flushing must be
performed for at least two hours, or longer if necessary, until clear and clean water is obtained at the
drain taps.
3. Stop the additional heating and the water circulation pump. Open all the bleed points and the drain
taps to empty the system completely. The short-circuited water supplies and returns must now be
connected to the units’ inlet and outlet connections. It is recommended to use Teflon tape on the
pipe connector threads. Do not use sealing paste on the hoses’ rotating connecters.
7.
Use steel, copper or P.V.C. pipes for the condensates drainage pipe. Each unit is supplied with a
connector for condensates drainage.
8.
The condensates drainage line must comprise a siphon and run from the unit on a downward slope
of at least 2%. Generally, the siphon
is connected directly to the unit’s
condensates drainage outlet. A length
of plastic pipe can be used between
the siphon and the condensates
drainage line.
A complete condensates drainage
system with copper or P.V.C. pipe can
also be used.
Screw-on connectors shall be fitted
to facilitate drainage pipe removal if
copper pipe is used for the drainage
pipe work.
9.
No point of the condensates drainage
pipe work should be located above
the level of one of the units’ condensate drainage outlet connection.
10.
The circuits’ high points must be bled of air.
11.
Comply with current regulations in terms of dielectric isolation of the connectors and the pipe
work.
