SYSHRW – Installation Operation Manual (IOM HRW 01 N 21GB)

English
Outlet water tempera-
ture sensor
Water circuit inlet / outlet
differential pressostat
Water outlet
Water inlet
17SYSHRW
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 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. PROTECTION AGAINST FREEZING
On all appliances, anti-freezing protection is provided by a temperature probe connected to the regulator.
This shuts down the SYSHRW if the water outlet temperature is below 10°C (cooling mode) or 13°C (heating
mode) for 5 seconds.
A fault code 111110000 (5 ashes) is then generated.
After 20 minutes’ stoppage, if the temperature rises over 13°C, the fault is cancelled automatically and the
SYSHRW is authorised to restart.
Note:
If 3 default codes 111110000 (5 ashes) are generated in less than one hour, then the regulator switches
the SYSHRW to total safety shutdown mode.
Am additional protection is assured by a differential pressostat. This safety device is tted on the plate
exchanger water side in order to guarantee that water circulates in the installation on one hand, and that
there is an adequate minimum water ow on the other hand.
Note:
The "differential pressostat" provides "total safety shutdown" the second time it is activated.
It can be reset manually by switching off the mains supply to the appliance.
The alarm fault code generated is code 100000000 (1 ash).