Pentair PRF 1035CS Service Manual page 3

EQUIPMENT INSTALLATION continued
• Operating water temperature is between 35°F (1°F) and
100°F (38°C).
• Working water pressure range is 20 to 125 psi (1.38 to 8.6
bar; 0.14 to 0.86 MPa). In Canada the acceptable working
water pressure range is 20 to 100 psi (1.38 to 6.89 bar;
0.14 to 0.69 MPa).
• Use only salt salts designed for water softening. Do not
use ice melting, block, or rock salts.
• Follow state and local codes for water testing. Do not use
water that is micro biologically unsafe or of unknown quality.
• When filling media tank, do not open water valve
completely. Fill tank slowly to prevent media from exiting
the tank.
• When installing the bypass water connection, connect to
the plumbing system first. Allow heated parts to cool and
cemented parts to set before installing any plastic parts.
Do not get primer or solvent on O-rings, nuts, or the valve.
System Recharge Cycles (9-Cycle Operation)
Service (Downflow):
Untreated water is directed down through the resin bed and up
through the riser tube. The hardness ions attach themselves
to the resin and are removed from the water. The water is
conditioned as it passes through the resin bed.
1. Brine Refill:
Water is directed to the salt tank at a controlled rate, to
create brine for the next recharge.
2. Brine Prep (Dissolve Salt)
After the refill cycle fills the salt tank with water, this cycle
allows time for the salt to dissolve into the water.
3. Backwash 1 (Upflow):
The flow of water is reversed by the control valve and
directed down the riser tube and up through the resin bed.
During the backwash cycle, the bed is expanded and debris
is flushed to the drain.
4. Brine Draw (Downflow):
The brine draw cycle takes place during the slow rinse
cycle. The control directs water through the brine injector
and brine is drawn from the salt tank. Brine draw is
completed when the air check in the salt tank closes.
5. Slow Rinse (Downflow):
The brine is directed down through the resin bed and up
through the riser tube to the drain. The hardness ions are
displaced by sodium ions and are sent to the drain. The
resin is recharged during the brine cycle.
6. Repressurize Cycle (Hard Water Bypass Flapper Open):
This cycle closes the flappers for a short time to allow the
air and water to hydraulically balance in the valve before
continuing the recharge.
7. Fast Rinse 1 (Downflow):
The control directs water down through the resin bed and
up through the riser tube to the drain. Any remaining brine
residual is rinsed from the resin bed.
8. Backwash 2 (Upflow):
The flow of water is reversed by the control valve and
directed down the riser tube and up through the resin bed.
During the backwash cycle, the bed is expanded and debris
is flushed to the drain.
9. Fast Rinse 2 (Downflow):
The control directs water down through the resin bed and
up through the riser tube to the drain. Any remaining brine
residual is rinsed from the resin bed.
Water Water
Flow Flow
Hardness Hardness
Time of Day Salt Regenerate Time of Day Salt Regenerate
Amount Amount
SERVICE BRINE REFILL
Cycle 1
From Regenerant
Tank
Water Water
Flow Flow
Hardness
Hardness
Day Time of Salt Regenerate Time of Salt Regenerate
Amount Day Amount
BRINE/SLOW RINSE REPRESSURIZE
Cycle 4 & 5 Cycle 6
Figure 1 Flow Patterns
System Features
Control
Salt
Compartment
Figure 2 Top of Unit
Time of Day
Button
Salt Amount Button
Figure 3 Control Front
To Regenerant
Tank
Water Water
Flow Flow
Hardness Hardness
Day Time of Salt Regenerate Time of Day Salt Regenerate
Amount Amount
BRINE PREP BACKWASH
Cycle 2 Cycle 3
Water Water
Flow Flow
Hardness Hardness
Time of Salt Regenerate Time of Salt Regenerate
Day Amount Day Amount
FAST RINSE BACKWASH FAST RINSE
Cycle 7 Cycle 8 Cycle 9
Display
Recharge
Button
Water Hardness Button
Matrix System 368/706W • 3
Water
Flow
Hardness
Time of Salt Regenerate
Day Amount
Inlet
Outlet
Drain
LCD