puroflux PF-20 Series User manual

OPERATION AND MAINTENANCE MANUAL
PF-20 Series
Permanent Media Filters
PUROFLUX
FILTRATION AND CONTROL SYSTEMS
CORPORATION

PUROFLUX CORPORATION
PAGE # 2 PF-20 Series Filter (ver. 1/20/10)
PF-20 SERIES PERMANENT MEDIA FILTERS
INTRODUCTION
PUROFLUX is the right choice when it comes to having a more efficient, safe, and effective system. The
PF-20 series filters are designed to assist in eliminating expensive "down-time," reducing operating costs,
chemical usage, wear and tear on equipment and maintenance. With over 30 years of combined filtration
experience, PUROFLUX engineers can find a solution to a wide variety of filtration problems.
Following the guidelines listed in this manual will help to insure the safety of all personnel who maintain
the filter unit and related equipment. If there are any questions on the procedures or performance of the
PF-20 series filters contact the local factory representative or call the factory direct at [phone].
Do Not, operate the filter until all questions about operating procedures are answered by a qualified
representative. This manual covers recommended procedures for installation and anchoring, start-up and
shut down, and safety and maintenance.
Puroflux Corporation
1357 Kuehner Drive, Simi Valley, CA 93063
Phone [phone] • Fax [phone]
Website: www.puroflux.com
E-Mail: [email protected]
Please read this OPERATION AND MAINTENANCE MANUAL thoroughly and understand
all safety related issues before attempting any work on the PF-20 series filter.
NOTE: All recommendations are minimums. The environment/operating conditions in which the filter
unit is installed will dictate the frequency of scheduled maintenance. Maintaining your PF-20 series
filter will assure a long trouble free life.
NOTE: Puroflux reserves the right to change, modify, or revise this manual at any time without prior
notification.

OPERATION AND MAINTENANCE MANUAL
PAGE # 3
PF-20 Series Filter (ver. 1/20/10)
SECTION 1
Receiving and Installation 4
Receiving Equipment 4
Design Criteria 5
Support and Lifting 5
Installation and Anchoring 5
Piping Interface Connections 6
Loading Media 7
Electrical Controls 8
Wiring Requirements 9
SECTION 2
Theory of Operation 10
Operation and Maintenance 10
General Maintenance 10
24 Hour Time Clock Settings 11
Pump Pre-Strainer 12
Pump and Motor 12
Cleaning and Adjusting Pump 12
Filter Vessel 13
Backwash Cycle 13
Start-Up Procedure 14
Operation In Cold Weather 15
Shutdown 15
Recommended Spare Parts 16
Fluid Treatment 16
Safety 16
SECTION 3
Warranty 17
Figure 3 18
TABLE OF CONTENTS

PUROFLUX CORPORATION
PAGE # 4 PF-20 Series Filter (ver. 1/20/10)
Table I ñ Receiving /
Inspection
Filter Vessel
Control Panel (Automatic Units)
Pump & Motor
Pump Pre-strainer
Gauge Kit
Valves & Linkage
Actuator (Automatic Units)
Face Piping
Media
RECEIVING AND INSTALLATION
Recommended procedures for the receiving of equipment
and proper installation of the PF-20 series permanent
media filter.
RECEIVING EQUIPMENT
Before accepting the filter equipment and prior to signing
the bill of lading, all equipment should be checked
thoroughly for any shipping damage. Make sure that all
required equipment noted on the bill of lading is received.
Refer to Figure 1 and Table I for components to be
inspected upon receiving.
Check the model and serial number against the packing
slip. Serial and model numbers can be found on a
nameplate inside the control cabinet (automatic unit) or
on the vessel skid (manual unit).
SECTION 1
Air Vent Valve and
Pressure Guage
Lined Carbon
Steel Vessel
with Internals
and Media
Electric Actator
(Automatic Units)
Sch 80 PVC Face Piping
Service Flanges
Cast Iron Pump with
Pre-Strainer
Coated Steel Skid
Drain
Nema 4X
Control Cabinet
(Automatic Units)
Bronze
Control
Valve
Handhole/Manhole
(TYP 2 PLC’S)
Pressure Switch
Figure 1
Stainless
Steel Vessel
Air Vent Valve and
Pressure Guage
Coated Carbon
Steel Handholes Control Valve
Electric Actator
(Automatic Units)
Sch 80 PVC Face Piping
Service Flanges
Cast Iron Pump
with Pre-Strainer
Coated Steel Skid
Drain
Pressure Switch
Nema 4X
Control Cabinet
(Automatic Units)

OPERATION AND MAINTENANCE MANUAL
PAGE # 5
PF-20 Series Filter (ver. 1/20/10)
SUPPORT AND LIFTING
The PF-20 series filter can be lifted from the bottom of the filter skid with the skid fully supported. If the
unit is hoisted, lifting straps must be placed under the bottom of the filter skid and should not come in
contact with the filter components.
INSTALLATION AND ANCHORING
The PF-20 series filter is designed for slip stream use on non-pressurized open sump or pressurized closed
system applications. The PF-20 series filter should be located as close to the sump or interface piping as
possible and never install in full flow system piping.
The PF-20 filter can be rigidly anchored to the floor using 1/2 inch anchor bolts. Refer to the specification
drawing for location of anchor holes.
After the PF-20 series filter is installed in its permanent location, the gauge kit should be installed on the
top of the filter vessel (refer to Figure 1).
NOTE: The PF-20 filter should not be installed more than 8 feet above the process liquid operating
level.
NOTE: Never install the PF-20 series filter in an application where the system pressure exceeds the
filter design pressure.
DESIGN CRITERIA
The PUROFLUX PF-20 series filter is designed for use in both open and closed (75 psi or less) process
liquid filter applications (higher design pressures are available). The PF-20 series filter with standard
media will remove suspended solids down to 10 microns (optional 5 micron and lower media is available).
The PF-20 series filter is constructed of a stainless steel vessel with coated carbon steel handholes,
industrial grade ball valves, Sch 80 PVC interconnecting piping, cast iron pump, and cast iron
pre-strainer with removable stainless steel basket.
The PUROFLUX PF-20 series lter is designed for use in both open and closed (75 psi or less) process liquid
lter applications (higher design pressures are available). The PF-20 series lter with standard media will
remove suspended solids down to 10 microns (optional 5 micron and lower media is available).
The PF-20 series lter is constructed of a stainless steel vessel with coated carbon steel handholes,
industrial grade ball valves, Sch 80 PVC interconnecting piping, cast iron pump, and cast iron pre-strainer
with removable stainless steel basket.

PUROFLUX CORPORATION
PAGE # 6 PF-20 Series Filter (ver. 1/20/10)
PIPING INTERFACE CONNECTIONS
The filter piping should be installed as follows:
1. Installation of interconnecting piping
• When mating interconnecting fittings to the filter unit make sure that filter components are securely
held in place so no damage or leaks occur.
• If welding or soldering mating flanges or fittings make sure not to overheat filter components.
Overheating filter components can cause damage or leaks.
• If welding DO NOT use the filter or its components as a ground.
2. Refer to Table ll for piping connection sizes.
3. Run an influent line from the system sump to the pump pre-strainer labeled "INLET". A service valve
and union should be installed in this line near the filter. Refer to specification drawings.
4. Run an effluent line from the filter return labeled "OUTLET" back to the system sump. A service valve
and union should be installed in this line near the filter. Refer to specification drawings.
5. Run a waste line from the filter waste outlet labeled "WASTE" to the nearest sewer drain. Table III on
page 7 lists the minimum and maximum backwash flow rates and volumes for the PF-20 series. A
union should be installed in this line near the filter. Refer to specification drawings.
6. For filters utilizing a source other than the process system water for backwash supply, Table Ill shows
the required backwash flow and volumes. The maximum backwash supply pressure for the PF-20 filter
is 40 psi. Run a line to the connection labeled "BACKWASH." If public or municipal water is used for
backwash, a backflow preventer is required in this line on all units. A service valve and union should be
installed in this line near the filter.
NOTE: Do not put any type of valve in the waste line! The sewer drain must be large enough
to handle and maintain the flow of the backwash cycle. If the drain is not large enough to support the
volume of waste generated during a backwash cycle, it may be necessary to use a reservoir tank to
collect the waste water. The flow from the reservoir tank can then be regulated to the drain.
NOTE: If the filter inlet connection is located above the process liquid operating level, a foot or check
valve must be installed below the water level to prevent loss of pump prime.
NOTE: Do Not reduce the pipe sizes listed, the pipe sizes are minimums. If long runs, excess fittings, or
lifts are necessary, it is recommended to enlarge the pipe diameter in order to reduce friction loss.
Never reduce the waste line; this can restrict the flow of the backwash cycle and reduce efficiency.
NOTE: It is important that all piping and components associated with the filter system installation must
be supported to eliminate stress on the filter and piping.
NOTE: Never overtighten service unions on the filter unit. Service unions should be hand tightened only.
Overtightening can cause damage, which may result in leaks.
NOTE: Always follow local, county, state or other government authorities requirements for piping hook-ups.
TABLE II - PIPING CONNECTION SIZES - DIMENSIONS SHOWN IN INCHES
MODEL - PF20 INLET OUTLET WASTE BACKWASH
12 1 1/2 FPT 1 FPT 1 FPT 1 FPT
18 1 1/2 FPT 1 1/2 FPT 1 1/2 FPT 1 1/2 FPT
24 1 1/2 FPT 1 1/2 FPT 1 1/2 FPT 1 1/2 FPT
30 2 FPT 2 FPT 2 FPT 2 FPT
36 2 1/2 FPT 2 1/2 FPT 2 1/2 FPT 2 1/2 FPT
42 3 FPT 3 FPT 3 FPT 3 FPT
PUROFLUX CORPORATION
PAGE # 6 PF-20 Series Filter (ver. 1/20/10)
PIPING INTERFACE CONNECTIONS
The filter piping should be installed as follows:
1. Installation of interconnecting piping
• When mating interconnecting fittings to the filter unit make sure that filter components are securely
held in place so no damage or leaks occur.
• If welding or soldering mating flanges or fittings make sure not to overheat filter components.
Overheating filter components can cause damage or leaks.
• If welding DO NOT use the filter or its components as a ground.
2. Refer to Table ll for piping connection sizes.
3. Run an influent line from the system sump to the pump pre-strainer labeled "INLET". A service valve
and union should be installed in this line near the filter. Refer to specification drawings.
4. Run an effluent line from the filter return labeled "OUTLET" back to the system sump. A service valve
and union should be installed in this line near the filter. Refer to specification drawings.
5. Run a waste line from the filter waste outlet labeled "WASTE" to the nearest sewer drain. Table III on
page 7 lists the minimum and maximum backwash flow rates and volumes for the PF-20 series. A
union should be installed in this line near the filter. Refer to specification drawings.
6. For filters utilizing a source other than the process system water for backwash supply, Table Ill shows
the required backwash flow and volumes. The maximum backwash supply pressure for the PF-20 filter
is 40 psi. Run a line to the connection labeled "BACKWASH." If public or municipal water is used for
backwash, a backflow preventer is required in this line on all units. A service valve and union should be
installed in this line near the filter.
NOTE: Do not put any type of valve in the waste line! The sewer drain must be large enough
to handle and maintain the flow of the backwash cycle. If the drain is not large enough to support the
volume of waste generated during a backwash cycle, it may be necessary to use a reservoir tank to
collect the waste water. The flow from the reservoir tank can then be regulated to the drain.
NOTE: If the filter inlet connection is located above the process liquid operating level, a foot or check
valve must be installed below the water level to prevent loss of pump prime.
NOTE: Do Not reduce the pipe sizes listed, the pipe sizes are minimums. If long runs, excess fittings, or
lifts are necessary, it is recommended to enlarge the pipe diameter in order to reduce friction loss.
Never reduce the waste line; this can restrict the flow of the backwash cycle and reduce efficiency.
NOTE: It is important that all piping and components associated with the filter system installation must
be supported to eliminate stress on the filter and piping.
NOTE: Never overtighten service unions on the filter unit. Service unions should be hand tightened only.
Overtightening can cause damage, which may result in leaks.
NOTE: Always follow local, county, state or other government authorities requirements for piping hook-ups.
TABLE II - PIPING CONNECTION SIZES - DIMENSIONS SHOWN IN INCHES
MODEL - PF20 INLET OUTLET WASTE BACKWASH
12 1 1/2 FPT 1 FPT 1 FPT 1 FPT
18 1 1/2 FPT 1 1/2 FPT 1 1/2 FPT 1 1/2 FPT
24 1 1/2 FPT 1 1/2 FPT 1 1/2 FPT 1 1/2 FPT
30 2 FPT 2 FPT 2 FPT 2 FPT
36 2 1/2 FPT 2 1/2 FPT 2 1/2 FPT 2 1/2 FPT
42 3 FPT 3 FPT 3 FPT 3 FPT
PUROFLUX CORPORATION
PAGE # 6 PF-20 Series Filter (ver. 1/20/10)
PIPING INTERFACE CONNECTIONS
The filter piping should be installed as follows:
1. Installation of interconnecting piping
• When mating interconnecting fittings to the filter unit make sure that filter components are securely
held in place so no damage or leaks occur.
• If welding or soldering mating flanges or fittings make sure not to overheat filter components.
Overheating filter components can cause damage or leaks.
• If welding DO NOT use the filter or its components as a ground.
2. Refer to Table ll for piping connection sizes.
3. Run an influent line from the system sump to the pump pre-strainer labeled "INLET". A service valve
and union should be installed in this line near the filter. Refer to specification drawings.
4. Run an effluent line from the filter return labeled "OUTLET" back to the system sump. A service valve
and union should be installed in this line near the filter. Refer to specification drawings.
5. Run a waste line from the filter waste outlet labeled "WASTE" to the nearest sewer drain. Table III on
page 7 lists the minimum and maximum backwash flow rates and volumes for the PF-20 series. A
union should be installed in this line near the filter. Refer to specification drawings.
6. For filters utilizing a source other than the process system water for backwash supply, Table Ill shows
the required backwash flow and volumes. The maximum backwash supply pressure for the PF-20 filter
is 40 psi. Run a line to the connection labeled "BACKWASH." If public or municipal water is used for
backwash, a backflow preventer is required in this line on all units. A service valve and union should be
installed in this line near the filter.
NOTE: Do not put any type of valve in the waste line! The sewer drain must be large enough
to handle and maintain the flow of the backwash cycle. If the drain is not large enough to support the
volume of waste generated during a backwash cycle, it may be necessary to use a reservoir tank to
collect the waste water. The flow from the reservoir tank can then be regulated to the drain.
NOTE: If the filter inlet connection is located above the process liquid operating level, a foot or check
valve must be installed below the water level to prevent loss of pump prime.
NOTE: Do Not reduce the pipe sizes listed, the pipe sizes are minimums. If long runs, excess fittings, or
lifts are necessary, it is recommended to enlarge the pipe diameter in order to reduce friction loss.
Never reduce the waste line; this can restrict the flow of the backwash cycle and reduce efficiency.
NOTE: It is important that all piping and components associated with the filter system installation must
be supported to eliminate stress on the filter and piping.
NOTE: Never overtighten service unions on the filter unit. Service unions should be hand tightened only.
Overtightening can cause damage, which may result in leaks.
NOTE: Always follow local, county, state or other government authorities requirements for piping hook-ups.
TABLE II - PIPING CONNECTION SIZES - DIMENSIONS SHOWN IN INCHES
MODEL - PF20 INLET OUTLET WASTE BACKWASH
12 1 1/2 FPT 1 FPT 1 FPT 1 FPT
18 1 1/2 FPT 1 1/2 FPT 1 1/2 FPT 1 1/2 FPT
24 1 1/2 FPT 1 1/2 FPT 1 1/2 FPT 1 1/2 FPT
30 2 FPT 2 FPT 2 FPT 2 FPT
36 2 1/2 FPT 2 1/2 FPT 2 1/2 FPT 2 1/2 FPT
42 3 FPT 3 FPT 3 FPT 3 FPT
MODEL - PF20 INLET OUTLET WASTE BACKWASH
12 1 1/2 FLNG 1 FPT 1 FPT 1 FPT
18 1 1/2 FLNG 1 1/2 FPT 1 1/2 FPT 1 1/2 FPT
24 1 1/2 FLNG 1 1/2 FPT 1 1/2 FPT 1 1/2 FPT
30 2 FLNG 2 FPT 2 FPT 2 FPT
36 2 1/2 FLNG 2 1/2 FPT 2 1/2 FPT 2 1/2 FPT
42 3 FLNG 3 FLNG 3 FLNG 3 FLNG
48 4 FLNG 4 FLNG 4 FLNG 4 FLNG
TABLE II - PIPING CONNECTION SIZES - DIMENSIONS SHOWN IN INCHES
The lter piping should be installed as follows:
1. Installation of interconnecting piping
• When mating interconnecting ttings to the lter unit make sure that lter components are securely held
in place so no damage or leaks occur.
• If welding or soldering mating anges or ttings make sure not to overheat lter components.
Overheating lter components can cause damage or leaks.
• If welding DO NOT use the lter or its components as a ground.
2. Refer to Table ll for piping connection sizes.

OPERATION AND MAINTENANCE MANUAL
PAGE # 7
PF-20 Series Filter (ver. 1/20/10)
* Backwash duration is factory set for 3 minutes.
LOADING MEDIA
The filter media should be installed as follows (refer to Table lV for media quantities).
One Drum = 1/2 cubic foot.
The 20 series filter units are supplied with two types of media (support gravel and filter media). The sup-
port gravel is used at the base of the filter below the underdrain to support the filter media. The filter media
is a spherical based crystalline silica and will remove up to 90% by volume of the suspended solids
10 microns and larger. The filter media will be shipped in 1/2 cubic-foot drums.
1. To load the filter media in the PF-20 series filter, remove the hex nut and crab clamp from the
handhole/manhole ring (be careful not to drop the handhole/manhole into the vessel). Press down on the
handhole/manhole cover until it drops loose. Remove the gasket and rotate the handhole cover lifting it
through the tank ring. Inspect the internals for damage before continuing.
2. Fill the vessel with water until the underdrain assembly is completely submerged in water. Load the
support gravel into the filter vessel first and level it out, then load the 10 micron silica into the vessel and level
it out (refer to Table IV for the amount of media required for each individual PF-20 series filter).
3. Inspect the handhole/manhole, gasket, ring, and cover for foreign matter, and clean all surfaces. Place
the handhole/manhole cover into the vessel. Slip the gasket over the handhole/manhole and reinstall the
crab clamp and hex nut. Align the gasket and crab clamp properly with the handhole/manhole and ring,
before tightening the hex nut. Do not overtighten the hex nut. Overtightening the hex nut can damage the
gasket.
4. Always follow start-up procedures whenever the filter unit has been turned off.
TABLE III - FLOW RATES - FLOWS SHOWN IN GALLONS/MINUTE
MODEL - PF20 FILTER RATE B/W (MAX) B/W (MIN) B/W VOLUME
12 15 15 12 45 GAL
18 35 35 30 105 GAL
24 65 65 55 195 GAL
30 100 100 85 300 GAL
36 140 140 120 420 GAL
42 190 190 162 570 GAL
TABLE IV - MEDIA REQUIREMENTS
QUANTITIES SHOWN IN 1/2 CU.FT.
MODEL - PF20 SUPPORT GRAVEL 10 MICRON SILICA.
12 1 1
18 2 2
24 3 5
30 4 5
36 7 10
42 14 13
* Media quantities depend on vessel construction.
OPERATION AND MAINTENANCE MANUAL
PAGE # 7
PF-20 Series Filter (ver. 1/20/10)
* Backwash duration is factory set for 3 minutes.
LOADING MEDIA
The filter media should be installed as follows (refer to Table lV for media quantities).
One Drum = 1/2 cubic foot.
The 20 series filter units are supplied with two types of media (support gravel and filter media). The sup-
port gravel is used at the base of the filter below the underdrain to support the filter media. The filter media
is a spherical based crystalline silica and will remove up to 90% by volume of the suspended solids
10 microns and larger. The filter media will be shipped in 1/2 cubic-foot drums.
1. To load the filter media in the PF-20 series filter, remove the hex nut and crab clamp from the
handhole/manhole ring (be careful not to drop the handhole/manhole into the vessel). Press down on the
handhole/manhole cover until it drops loose. Remove the gasket and rotate the handhole cover lifting it
through the tank ring. Inspect the internals for damage before continuing.
2. Fill the vessel with water until the underdrain assembly is completely submerged in water. Load the
support gravel into the filter vessel first and level it out, then load the 10 micron silica into the vessel and level
it out (refer to Table IV for the amount of media required for each individual PF-20 series filter).
3. Inspect the handhole/manhole, gasket, ring, and cover for foreign matter, and clean all surfaces. Place
the handhole/manhole cover into the vessel. Slip the gasket over the handhole/manhole and reinstall the
crab clamp and hex nut. Align the gasket and crab clamp properly with the handhole/manhole and ring,
before tightening the hex nut. Do not overtighten the hex nut. Overtightening the hex nut can damage the
gasket.
4. Always follow start-up procedures whenever the filter unit has been turned off.
TABLE III - FLOW RATES - FLOWS SHOWN IN GALLONS/MINUTE
MODEL - PF20 FILTER RATE B/W (MAX) B/W (MIN) B/W VOLUME
12 15 15 12 45 GAL
18 35 35 30 105 GAL
24 65 65 55 195 GAL
30 100 100 85 300 GAL
36 140 140 120 420 GAL
42 190 190 162 570 GAL
TABLE IV - MEDIA REQUIREMENTS
QUANTITIES SHOWN IN 1/2 CU.FT.
MODEL - PF20 SUPPORT GRAVEL 10 MICRON SILICA.
12 1 1
18 2 2
24 3 5
30 4 5
36 7 10
42 14 13
* Media quantities depend on vessel construction.
MODEL - PF20 FILTER RATE B/W (MAX) B/W (MIN) B/W VOLUME
12 15 15 12 45 GAL
18 35 35 30 105 GAL
24 65 65 55 195 GAL
30 100 100 85 300 GAL
36 140 140 120 420 GAL
42 190 190 162 570 GAL
42 250 250 214 750 GAL
TABLE III - FLOW RATES - FLOWS SHOWN IN GALLONS/MINUTE
* Backwash duration is factory set for 3 minutes.
MODEL - PF20 SUPPORT MEDIA FILTER MEDIA
12 1 1
18 2 2
24 3 5
30 4 5
36 7 10
42 14 13
48 Consult Factory
TABLE IV - MEDIA REQUIREMENTS
QUANTITIES SHOWN IN 1/2 CU.FT.
* Media quantities depend on vessel construction.
OPERATION AND MAINTENANCE MANUAL
PAGE # 5
PF-20 Series Filter (ver. 1/20/10)
SUPPORT AND LIFTING
The PF-20 series filter can be lifted from the bottom of the filter skid with the skid fully supported. If the
unit is hoisted, lifting straps must be placed under the bottom of the filter skid and should not come in
contact with the filter components.
INSTALLATION AND ANCHORING
The PF-20 series filter is designed for slip stream use on non-pressurized open sump or pressurized closed
system applications. The PF-20 series filter should be located as close to the sump or interface piping as
possible and never install in full flow system piping.
The PF-20 filter can be rigidly anchored to the floor using 1/2 inch anchor bolts. Refer to the specification
drawing for location of anchor holes.
After the PF-20 series filter is installed in its permanent location, the gauge kit should be installed on the
top of the filter vessel (refer to Figure 1).
NOTE: The PF-20 filter should not be installed more than 8 feet above the process liquid operating
level.
NOTE: Never install the PF-20 series filter in an application where the system pressure exceeds the
filter design pressure.
DESIGN CRITERIA
The PUROFLUX PF-20 series filter is designed for use in both open and closed (75 psi or less) process
liquid filter applications (higher design pressures are available). The PF-20 series filter with standard
media will remove suspended solids down to 10 microns (optional 5 micron and lower media is available).
The PF-20 series filter is constructed of a stainless steel vessel with coated carbon steel handholes,
industrial grade ball valves, Sch 80 PVC interconnecting piping, cast iron pump, and cast iron
pre-strainer with removable stainless steel basket.

PUROFLUX CORPORATION
PAGE # 8 PF-20 Series Filter (ver. 1/20/10)
ELECTRICAL CONTROLS
The PF-20 series filter can be supplied in a number of configurations and voltages. Standard voltages
include 460v/3Ø/60hz, 230v/3Ø/60hz, 208v/3Ø/60hz (additional alternate voltages are available). Primary
voltage will be reduced to 120v control voltage. Control components will vary depending on filter configu-
ration and options.
1. Standard filter units supplied with automatic backwash are equipped with a NEMA type 4X control cabinet
containing a locking combination on/off disconnect switch with motor circuit protection (MCP), control
transformer (primary/120v secondary), adjustable backwash timer, 24 hour backwash time clock, magnetic
motor starter (external backwash source units only), pressure differential switch, electric valve actuator,
terminal strip and manual override push button.
2. Manual filter units are provided with a manually controlled valve positioner and exclude all control
components and motor protection.
NOTE: Optional control items may include: programmable logic controller (PLC), indicating lamps, delay
timer, audio and visual alarms, dry contact signals, and hand-off-auto (HOA) switch.
NOTE: A NEMA type 3R coated steel enclosure may be supplied as an alternative to the
NEMA type 4X polycarbonate enclosure on certain units.

OPERATION AND MAINTENANCE MANUAL
PAGE # 9
PF-20 Series Filter (ver. 1/20/10)
Automatic Units:
1. Install circuit breaker between the closest branch distribution panel and the control panel (refer to
Table V for amperage draw by motor horsepower). The control cabinet is pre-wired and includes a door
disconnect switch with overload and short circuit protection.
WIRING REQUIREMENTS
NOTE: Always follow local, county, state or other government authorities requirements for electrical
hook-up.
Manual Units:
1. Install a circuit breaker between the closest branch distribution panel and the pump motor (refer to Table V
for amperage draw by motor horsepower).
2. Install an externally operated switch with fuse protection and door interlock in plain sight of the filter.
Fuse protection must be sized to handle starting and full load amperage draws.
NOTE: All incoming power supply lines must be connected to the door disconnect.
TABLE V - ELECTRICAL REQUIREMENTS
MOTOR HP MOTOR VOLTAGE AMPERAGE 1 PHASE
1 110, 208, 220 16, 9, 8
2 110, 208, 220 24, 14, 12
MOTOR HP MOTOR VOLTAGE AMPERAGE 3 PHASE
1 208, 240, 460 5, 4, 2
2 208, 240, 460 8, 7, 4
3 208, 240, 460 11, 10, 5
5 208, 240, 460 17, 16, 8
7 1/2 208, 240, 460 25, 22, 11

PUROFLUX CORPORATION
PAGE # 10 PF-20 Series Filter (ver. 1/20/10)
THEORY OF OPERATION
Influent (unfiltered) fluid is drawn via the pump into the filter piping, where it enters the overdrain (upper
internals). The influent fluid is dispersed over the filter media evenly. Suspended solids are trapped in the
pores formed between the media. The effluent (filtered) fluid then passes from the vessel through the
underdrain (lower internals) and is returned to the system.
The differential pressure increases as the trapped particles load the media. When the differential pressure
reaches 16 psi, a backwash cycle is required. The control valves are repositioned, reversing the flow and
the media is backwashed. The reverse flow lifts and churns the media causing a scouring action to release
the trapped debris. The trapped debris is then pushed up through the overdrain and flushed to drain. On
completion of the backwash cycle, the valves are repositioned and the filtration process continues.
OPERATION AND MAINTENANCE
The following information pertains to the procedures, operation and general maintenance of the PF-20 series
permanent media filter.
Please read this entire OPERATION and MAINTENANCE MANUAL thoroughly and understand all safety
related issues before attempting any work on the PF-20 series filters.
GENERAL MAINTENANCE PROCEDURES
Always follow the start-up and shut down procedures before and after any service or maintenance is done on
the filter unit. The PF-20 series filters are designed for low maintenance and minimal service. With proper
care the PF-20 series filters will provide trouble free service. The following is a list of maintenance check
points and schedules.
1. Visually inspect filter every 48 hours (minimum) for proper operation
(check for unusual noise and/or vibration).
2. Read pressure gauge (gauge reading should not exceed 75 psi).
3. Backwash filter every 48 hours (minimum).
4. Never allow differential pressure to increase above 16 psid.
5. Check media condition every 6 months (replace if needed).
6. Inspect filter internal assembly each media change.
7. Clean pump pre-strainer before blind-off occurs (check as often as environment dictates).
8. Check condition of gaskets (filter and pre-strainer) each time the filter is serviced.
9. Check voltage and amperage draw on motor lead.
NOTE: All recommendations are minimums. The environment/operating conditions in which the filter
unit is installed will dictate the frequency of scheduled maintenance. Maintaining your PF-20 Series
filter will assure a long trouble free life.
SECTION 2