TM 10-4610-232-12
CAUTION
Do not switch valve positions until media filter pressure drops below 3 psig (21 kPa).
(2)
Backwash step 2, air/water backwash (approximately 1 minute).
(a)
Clean/flush outlet valve V5 (3) - closed.
(b)
Media filter inlet valve V16 (4) - closed.
(c)
Backwash inlet valve V15 (5) - open.
(d)
Backwash outlet valve V17 (6) - open.
(e)
Media filter outlet valve V35 (7) - closed.
(f)
Media filter flush valve V36 (8) - closed.
(g)
Air backwash valve V22 (9) - partially open. Do not let air system pressure drop below 150 psig (1034 kPa).
(h)
Push RAW WATER PUMP START (12).
NOTE
Remember to adjust feed flow to 30 gpm using the feed control valve.
(i)
Watch air blanket level indicator (13).
(j)
When level (red flags) reaches 3 inches from top, close air backwash block valve (9).
(3)
Backwash step 3, water backwash (10 minutes).
(a)
Clean/flush outlet valve V5 (3) - closed.
(b)
Media filter inlet valve V16 (4) - closed.
(c)
Backwash inlet valve V15 (5) - open.
(d)
Backwash outlet valve V17 (6) - open.
(e)
Media filter outlet valve V35 (7) - closed.
(f)
Media filter flush valve V36 (8) - closed.
(g)
Air backwash valve V22 (9) - closed. (This is the only valve that changes position.)
(h)
Push BOOSTER PUMP START (14).
NOTE
Remember to adjust feed flow to proper amount per Table 2-25 using the feed control valve.
(i)
After 10 minutes, push BOOSTER PUMP STOP(15) and RAW WATER PUMP STOP (16).
(4)
Backwash step 4, clean water backwash (two minutes).
(a)
Clean/flush outlet valve V5 (3) - open. (This is the only valve that changes position.)
(b)
Media filter inlet valve V16 (4) - closed.
(c)
Backwash inlet valve V15 (5) - open.
(d)
Backwash outlet valve V17 (6) - open.
(e)
Media filter outlet valve V35 (7) - closed.
(f)
Media filter flush valve V36 (8) - closed.
(g)
Air backwash valve V22 (9) - closed.
(h)
Set OPERATION MODE switch (1) to SYSTEM CLEAN position and push INITIATE (2).
(i)
Push BOOSTER PUMP START (14).
2-162 Change 12
