IOM SYSCW AR R513A (IOM CWAR 02 N 1GB/12.21)

English
INTERCONNECTED CONVEYANCES
Rubber hose
Main return pipe work
Main water supply pipe work
Spherical
dome valve
18 SYSCW-AR R513A
8. Use steel, copper or P.V.C. pipes for the condensates drainage pipe. Each unit is supplied with a
connector for condensates drainage.
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.
1. Before commissioning an appliance for the rst 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 ow control devices.
2. The system must be lled from the mains water supply. All air
bleeds must be open during lling. Close the air bleeds once
the system is lled.
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 ows 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
ushing 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 Teon 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 ushing.
However, nowadays numerous countries forbid the introduction of phosphates into their wastewater
networks. Therefore, it is now recommended that the system is ushed 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.
At this stage, the recommended percentage of anti-freeze can be added. Use commercial quality
anti-freeze specically 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 ow 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 ows.
12.3. RECOMMENDATIONS FOR CLEANING AND FLUSHING OUT THE SYSTEM