OPERATORS MANUAL
ORION II
Orion II 500-10000 Operators
Page 26 of 95
Manual Part no: DOMAON0100 Issue A
April 2008
The first softener (SOF11-01) is regenerated in this way, however, the secondary softener (SOF11-
02) is regenerated after every third primary softener regeneration.
The softeners are interlocked so that only one can regenerate at a time and the sensor detects
hardness at a point at which there is enough spare capacity in the softener to allow it to continue
whilst the other unit passes through a regeneration sequence.
If the second sensor detects hard water whilst it should be in service the unit shuts down and alarms.
A user with operator level security access can manually initiate a regeneration and if necessary
manually step each unit through the regeneration sequence using the HMI.
Sample valves V11-01, V11-03 and V11-09 can be used to sample the water to establish the
performance of the softeners.
Where the feed water has been dechlorinated the Standard Base Exchange Softener softener option
can be used, although it should be recognised that CarboSoft provides an excellent degree of
protection from oxidative damage to the RO and CEDI modules should an unexpected quantity of
chlorine appear in the feed water.
RO and CEDI modules on units supplied without CarboSoft softeners will not carry warranty
against oxidative damage.
5.1.6 Cartridge Filtration
5µm cartridge depth-filters are located downstream of the softeners to remove particles from the
water to protect the RO system. The filter cartridges are contained in a housing designated FI11-01.
Local pressure indication (PI11-02 & PI11-03) is used as a guide to cartridge replacement with
cartridges being replaced when the pressure drop across the housing reaches 1.5bar. A manual
valve, V11-04 is used for isolation of the filter housing during cartridge replacement and a drain
valve V11-06 allows the housing to be drained before filter replacement.
5.1.7 Recirculation Loop
A pump (PU11-01) recirculates water from TK30-01 through the softeners and back to TK30-01.
This is used during HWS to circulate hot water through the softeners to sanitise them.
The pump also maintains a flow of water trough the loop during normal operation to prevent
stagnation.
The pump is controlled by a flow meter (FT11-02) which has two set points
–
High Flow for HWS
Lower Flow for Operation
An automatic valve (VA11-07), fitted with a limit to open device (set up on commissioning) is located
on a branch on the outlet of FT11-02 and is opened during Cooling Stages 1&2 following hot water
sanitisation (HWS) to cool system.
