MODEL: N74A1-63510/N74A3-63610/N74B1-63510B/N74B3-63610B
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the requirement.
⑥ Exchange factor
Exchange factor =E/ (k×1000)
In this formula, E——Resin working exchange capability（mol/m
3
）， it
is related to the quality of resin. Down-flow regeneration, take 800～900.
Up-flow regeneration, take 900～1200.
K——Security factor, always take 1.2～2. It is related to the hardness
of inlet water: the higher the hardness is, the bigger the K is.
⑦ Regeneration time：The whole cycle for generation is about two hours.
Please try to set up the regeneration time when you don’t need water
according to the actual situation.
The calculation of parameters for each step is only for reference, the
actual proper time will be determined after adjusting by water exchanger
supplier. This calculation procedure of softener is only for industrial
application; it is not suitable for small softener in residential application.
3.5.Parameter Enquiry and Setting
3.5.1 Parameter Enquiry
When light on, press and hold both and for 5 seconds to
lift the button lock status; then press and light on, enter to program
display mode; press or to view each value according to below
process.（Press exit and turn back to service status.）
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