Page 13
Jandy
®
Commercial Horizontal Sand Filter | Installation & Operation Manual
ENGLISH
• 34-Series: 7.4”
• 42-Series: 8.9”
A
Figure 5. Free Board Measurement
NOTE:
Remove any plastic and tape from the diffusers
after the sand is poured in the filter and before
starting the system.
4.3 Reinstall Access Hatch
CAUTION
Ensure that the O-ring is completely clean and lubricated with a non-
petroleum based lubricant. Before subjecting the filter to pressure,
ensure that the handle is resolved as tightly as possible so that a
good seal is achieved.
WARNING
Follow these instructions carefully. Improper lid installation can cause
product failure or also cause the filter lid to be blown off, which may
result in death, serious injury or property damage.
WARNING
Never attempt to adjust or remove the lid when the pump is running
or there is pressure in the system. This can cause product failure or
also cause the filter lid to be blown off, which may result in death,
serious injury or property damage.
Inspect the lid and tank for any damage before installing the lid. A
damaged lid or tank could cause the lid to be blown off, which may
result in death, serious injury or property damage.
1. Ensure the tank access hatch seat is clean and
free of all media grains.
2. Clean the gasket seal and install in a reverse
order to removal.
3. Assure that all hatch hardware is clean and free
of media.
4. Secure the fastening hardware in standard
torque pattern in 1/3 increments ensuring a
torque setting of the 30 ft. lbs.
5. Confirm torque setting once filter is in operation
and at normal operating pressure.
4.4 Initial Backwash Cycle
1. Open all filter tank manual air relief valves.
2. a) If equipped with an automatic backwash
controller, set the controller to the "backwash"
position. Ensure that the valves have rotated
to allow water from the pump through the filter
influent line. Also ensure that the effluent valve is
diverting the water to waste.
b) If equipped with manual backwash valves,
ensure that the valves have rotated to allow
water from the pump through the filter influent
line. Also ensure that the effluent valve is rotated
to divert the water to waste.
3. Turn on recirculation pump to begin the initial
backwash cycle.
• Observe media through access hatch. Media
should rise 3 to 4 inches.
• Inspect backwash flow to waste to assure
no sand removal, only media fines. The
difference between fines and sand is
distinctive.
• Adjust influent and effluent valves to slow
flow if needed to prevent sending media to
sewer.
4. If system has multiple tanks, this adjustment
may be required for each tank as clean media
increases flow available to backwash the next
tank.
• You may need to pause this procedure to
allow pool fill to replace displaced water.
• Be sure to restart initial backwash sequence
on the last tank that was not completed.
