RLC-SVX19J_SHORT-GB
19
Optional Free-Cooling
Figure 11 – Flow chart - Free cooling - Glycol free version
Note:
glycol free cooling chilled water setpoint should be in the range of [4°C - 20° C]. Glycol is fi lled on the free
cooling coils on valve item 4 (3/4”).
Note for installation
All Submittal, lifting diagram, neoprene pads positioning and wiring diagrams have been supplied with chiller order.
The maximum pressure of the Glycol side when unit is equipped with free cooling is 400 kPa for Glycol free option
or 600kPa for Direct free cooling except on evaporator side for glycol free 1000 kPa Refer to unit nameplate for rated
value.
Pump operation with Glycol free : it is requested to have a minimum water side pressure of 250 kPa to avoid
cavitation.
Glycol free option : To avoid component damage, a fi lter (1 mm mesh) must be supplied by the customer and
installed at the unit inlet.
Unit is shipped without glycol content on the free cooling circuit.
Free cooling loop venting must be performed by using Manual override mode to run the free cooling pump and
opening free cooling and closing bypass valve.
At 10 to 20°C ambient, the expansion shall be pressurized at 250 kpa. It should be checked when glycol loop is not yet
fi lled or glycol pressure is near zero.
All Free-cooling units must be freeze-protected with at least 30% Ethylene Glycol in the cooling loop circuit which is
the most convenient percentage in order to protect the unit against freezing. Upon receipt, make sure that there is no
remaining test water in the free cooling circuit as it may freeze during winter periods.
Protection coverage with 30% Ethylene Glycol:
- Freezing point without burst effect = -13°C
- Freezing point with burst effect = -50°C.
Water can be trapped in BPHE and specifi c care must be taken to remove it completly from BPHE during off mode if
drainage is the winter protection chosen.
