IONPURE
®
VNX50HH-2 CEDI Modules
Page 19
IP-MAN-VNX50HH2
6.3. Cleaning Circumstances
The module may need CLEANING if:
•
product differential pressure increases by 50% without a change in temperature and flow, or
•
reject differential pressure increases by 50% without a change in temperature and flow, or
•
product quality declines without a change in temperature, flow, or feed conductivity, or
•
the module electrical resistance increases by 25% without a change in temperature.
The above factors may indicate module fouling or scaling. Contact your Local service Provider to
determine if the module needs cleaning or for the best cleaning procedure.
6.4. Sanitization Circumstances
The system may require periodic SANITIZATION if the product water calls for low levels of
bacteria (user specific requirement).
6.5. Required Cleaning and Sanitizing Equipment
The following equipment must be constructed of
material compatible with the recommended cleaning
solutions.
Thoroughly flush all plumbing and other equipment before cleaning or sanitization to remove debris that
might damage the system.
During cleaning, the following equipment is required:
Tank
Connect a tank to the VNX system. The tank should be large enough to accommodate solution
volumes as shown in this section. The cleaning solution will be prepared in this tank.
Pump
Install a cleaning pump between the system and the cleaning tank. The pump must provide a minimum
discharge pressure of at least 30 psig (2 bar) for VNX50-HH installations. For the best results, size
pumps for the maximum possible flow up to the values listed in Table 6-1.
The construction materials of the wetted surfaces in the pump must be compatible with the
cleaning solutions. Plastics generally work well with most cleaning chemicals.
During cleaning or chemical sanitization, adjust flow rates as follows to maintain flow velocity in
all spacers (use the highest flow rate possible per Table 6-1):
Table 6-1: Cleaning Flow Rates
VNX50-HH
min – max
Product Flow
25-50 gpm (5.7 -11.4 m
3
/hr)
Dilute Flow
30-75 gpm (6.8 – 17 m
3
/hr)
Reject Flow
Calculation
0.5 x Product Flow
Reject Flow
5-25 gpm (1.14 - 5.7 m
3
/hr)
Pump Capacity
30-75 gpm (5.7 - 17 m
3
/hr)
