Recommendations For Cleaning And Flushing Out The System - Iom CWAR 01-N-3ALL Manuel D'installation Et De Maintenance

8. No point of the condensates drainage pipe work should be located above the level of one of the
units' condensate drainage outlet connection.
9. The circuits' high points must be bled of air.
10. Comply with current regulations in terms of dielectric isolation of the connectors and the pipe work.

10.2. 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.
Po w e r s u p p l y t o t h e c o o l i n g t o w e r m u s t b e s h u t d o w n , a n d t h e w a t e r l o o p
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.
4. Formerly, sodium tri-phosphate used to be recommended as a cleaning agent for
flushing. However, nowadays numerous countries forbid the introduction of phosphates into their
wastewater networks. Therefore, it is now recommended that the system is flushed out with
hot water (30 °C).
5. Fill the system again with clean water. Test the water acidity level (litmus paper), and treat as
required to obtain a slightly alkaline water quality (pH 7.5 to 8.5).
At this stage, the recommended percentage of anti-freeze can be added. Use commercial quality anti-
freeze specifically intended for air conditioning systems. Do not use automobile radiator anti-freeze.
6. On the main electrical cabinet, adjust the heater set temperature point at 20 °C and the cooling tower
set temperature at 30 °C. Connect the power supply to all motors and start the circulation pumps.
When the normal flow level has been reached through all components, including the cooler (irrespective of the
season) and when the air is bled form the system and the loop temperature has stabilised, each appliance is ready
to be checked, tested and started for balancing the air and water flows.
INTERCONNECTED
Return conveyance
Supply conveyance
Rubber
hose
11
CONVEYANCES
Main circuits