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4. DETERMINE OPERATING DC CURRENT PRIOR TO STARTUP
The VNX50HH-2 modules are designed and tested to operate correctly at 8 amps. If the feed water
meets the influent quality requirements for the VNX50HH-2, the current will be set independent of the
Feed Water Conductivity (FCE).
Set the power supply to operate in constant amperage mode and set the
amperage at 8 Amps DC.
Note – This procedure is different from our typical startup amperage calculation that would be calculated
based on the Feed Water Conductivity Equivalent (FCE).
5. START-UP PROCEDURE
5.1. Test interlocks
•
Test flow switches and other interlocks, including the RO interlock if applicable
•
Test pressure relief if applicable
•
Set alarm points
5.2. Notes on Recovery, Silica and Hardness
VNX50HH-2
•
VNX recovery of 90% is limited to systems with feed water total hardness of less than 1 ppm
as CaCO
. For systems operating with CEDI feed water hardness from 1 – 2 ppm as CaCO
3
the maximum water recovery is limited to 80%. In addition there is a minimum reject flow of
2.6 gpm per VNX modules.
•
For normal recovery of 80-90%, feed water silica must be ≤ 1 ppm as SiO
Table 5-1: Flow Range
Hardness
Recovery
(as CaCO
)
3
1-2 ppm
<1 ppm
Page 16
VNX50HH-2 CEDI Modules
Flow
Range
Minimum
80%
Nominal
Maximum
Minimum
90%
Nominal
Maximum
Concentrate
feed from
Dilute (CEDI
Dilute Feed
Product)
3
Gpm [m
/hr]
Gpm [m
25
[5.68]
5
50
[11.36]
10
62.5
[14.2]
12.5
25
[5.68]
2.6
50
[11.36]
5
62.5
[14.2]
6.2
2
Net Product
3
3
/hr]
Gpm [m
/hr]
[1.14]
20
[4.54]
[2.27]
40
[9.08]
[2.84]
50
[11.36]
[0.59]
22.4
[5.09]
[1.14]
45
[10.22]
[1.41]
56.3
[12.79]
IP-MAN-VNX50HH2
3
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Table of Contents
Troubleshooting
