TM 10-4610-310-14
0022 00
SECOND PASS SETUP AND OPERATING PROCEDURE - continued
7. Place the control module MODE switch to the MAINTENANCE position. (NOTE: When the LWP is
operating in the MAINTENANCE MODE the system will not backwash or fast flush. This will conserve the
first pass product water so that the daily water production is maximized. If the operator observes any
significant TMP increases (greater than 4 psid in 4 hrs) during second pass operation a manual backwash
or fast flush can be initiated. See WP 0040 00)
8. Energize the control module by placing CB1 to the ON position. Do not operate the raw water pump.
9. Start up LWP following the normal operating instructions in WP 0008 00 and 0009 00. Do not operate the
antiscalant chemical pump nor the raw water pump. Set the antiscalant pump speed to 0. Follow the
chemical injection instructions for the hypochlorite injection in WP 0010 00.
CAUTION
The water level in the settling tank must be constantly monitored. Shutdown operations when it is almost empty.
Damage to equipment may result.
10. Adjust the RO feed pressure with reject control valve V11 to a product water flow rate of 2.25 gpm. (NOTE:
During operation of the second pass, the product flow rate will always be adjusted to 2.25 gpm.)
11. Measure the water quality of the second pass product water using the TDS and chlorine meters. The
product TDS should be less than 1 mg/liter in double pass mode after the NBC canisters at sampling hose.
See Figure 3.
SAMPLING HOSE
SOME
DETAILS
REMOVED FOR
CLARITY
Figure 3. Chemical Module Sampling Hose.
