MODEL: N74A1-63510/N74A3-63610/N74B1-63510B/N74B3-63610B
28
3.4.Parameter settlement
① Service timeT1
Water treatment capacity：
Q=V
R
×K÷Y
D
（m
3
）
Hardness of Inlet Water (mmol/L)
Exchange factor (mmol/L) 400~1000.
Down-flow regeneration, take 400~750.
Up-flow regeneration, take 450~1000.
If the inlet water hardness is higher, the
factor is smaller.
Resin volume (m
3
)
By hours: T1=Q÷Q
h
（Hour）
Water treatment capacity per hour (m
3
/h)
Water treatment capacity（m
3
）
By days： T1=Q÷Q
d
（Day ）
Water treatment capacity per day (m
3
/d)
Water treatment capacity (m
3
)
② Backwash time T2
It is subject to the turbidity of inlet water. Generally, It is suggested to
be set 10～15 minutes. The higher the turbidity is, the longer backwash
time can be set. However, if the turbidity is more than 5 FTU, it should be
better to install a filter in front of the exchanger.
③ Brine & Slow rinse time T3
T3=(40～50)×H
R
（min.）
Generally, T3=45H
R
（min.）
In this formula, H
R
——the height of resin in exchange tank (m.)
④ Brine refill time T4
Down-flow regeneration：T4＝0.45×V
R
÷Brine refill speed (min.)
Up-flow regeneration：T4＝0.34×V
R
÷Brine refill speed (min.)
In this formula, V
R
—— Resin volume (m
3
)
The Brine refill speed is related to inlet water pressure. It is suggested
to lengthen 1~2 minutes of calculated brine refilling time to make sure there
is enough water in tank. （The condition is that there is a level controller
installed in the brine tank）
⑤ Fast rinse time T5
T5=12×H
R
（min.）
Generally, the water for fast rinse is 3~6 times of resin volume. It is
suggested to be set 10~16 minutes, but subject to the outlet water reaching
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