SYSHRW – Installation Operation Manual (IOM HRW 03 N 13GB)

English
Outlet water tempera-
ture sensor
Water circuit inlet / outlet
differential pressostat
Water outlet
Water inlet
15SysHrw
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).
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 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.