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Instructions for ReplacingPiston Assembly and Seal KitReplacing Piston Assembly
See pages 17 and 18 for Parts Diagrams.
1. Place Iron Curtain System on bypass. (Close inlet and
outlet valves and open bypass valve.) See Figures 1, 2
& 3 on page 8.
2. Relieve pressure by manually advancing timer to back-
wash position (See page 10). Unplug control valve after
valve is shifted into backwash position (piston all the way
in) and piston has stopped moving. After pressure is
relieved, proceed.
3. With a 5/8" wrench
• Loosen fitting nuts on back of air recharge valve and
air bleedoff valves (3/8" white and black polytubing
connecting the control valve to aeration head) and
disconnect tubings from air recharge and air bleedoff
valves.
• Loosen remaining fitting nut on air bleedoff valve and
disconnect tubing. (3/8" black polytubing connecting
air bleedoff valve to drain fitting.)
4. While holding the powerhead assembly firmly, remove
the two capscrews holding powerhead backplate to
valve body and remove the powerhead and piston
assemblies. Note: Some piston seals and/or spacers
may come out of the valve body with the piston assembly.
If so, see Seal Kit Replacement instructions fo
r
re-installing them.
5. Remove connecting link pin that connects piston rod to
the connecting link on drive cam assembly and remove
piston assembly.
6. Inspect the inside of the valve to make sure that all piston
seals and spacers are in place. If piston seals and/or
spacers need to be re-installed or replaced, see Seal Kit
Replacement instructions.
7. Lubricate the piston and piston seals with silicone lubricant.
8. Start the piston into the valve body and slowly push the
piston assembly with end plug into the valve body. Push
piston rod in all the way, leaving only the connecting hole
end without teflon coating exposed.
9. Place two capscrews through holes in backplate, align
with female threads in valve body and turn capscrews a
couple turns to support powerhead assembly. Do not
completely tighten screws until connecting link pin is
installed. Caution: Be careful not to scratch exposed
piston rod.
10. Install connecting link pin, connecting piston rod to the
connecting link on drive cam. Note: If connecting link pin
hole and piston rod hole are not aligned, the drive motor
can be disengaged by grasping the motor shaft on the
upper left side of drive motor and pulling outwards. While
holding the motor shaft out, the drive cam can be turned
clockwise to move connecting link to align connecting
link hole with piston rod hole.
11. Tighten the two capscrews and plug in control valve
powercord.
12. Manually advance the timer to service position and allow
control valve to cycle until in the service position. See
page 10 for instructions on manually advancing timer.
13. Manually advance the timer to the backwash position
and allow to stop. Then advance timer to the beginning
of the air recharge cycle. Unplug the control valve
powercord.
14. Open inlet valve no more than 1/4 turn and allow system
to fill slowly. After a steady stream of water is seen at the
drain without excess air, proceed to the next step.
15. Close the bypass valve and open the inlet valve all the
way.
16. Plug in the control valve powercord. In approximately
four minutes, the aeration pump will automatically turn
on and begin to pump air into the aeration tank. Allow the
Iron Curtain Control Center to finish the remaining
cycles. Set time of day.
17. Open the outlet valve on the filter, then open the nearest
cold water faucet and allow the water to run until the air
stops spurting and discoloration is gone. Note: It is
normal for aerated water to appear effervescent.
Piston
Rod
Piston Assembly
Capscrews
Connecting Link Pin
End Plug
Connecting Link Pin