Pentair DM - 75, DM - 90, DM -120, DM - 180, DM - 240 Owners Manual

DM - 75, 90, 120, 180, 240 Cartridge Filter

Owners Manual

IMPORTANT SAFETY INSTRUCTIONS

READ AND FOLLOW ALL INSTRUCTIONS

SAVE THESE INSTRUCTIONS

Table of Contents

SECTION I. INSTALLATION & OPERATING INSTRUCTIONS . . . . . . . . . . . . . . . . . . 2

SECTION II. CLEANING THE HIGH FLOW MANUAL AIR RELIEF VALVE . . . . . . . . . 4

SECTION III. REMOVING THE CARTRIDGES FOR CLEANING OR REPLACING . . 4

SECTION IV. TECHNICAL DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

SECTION V. HEAD LOSS CHART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

WARNING

Before installing this product, read and follow all warning notices and instructions accompanying this product.
Failure to follow safety warnings and instructions can result in severe injury, death, or property damage.
Call [phone] for additional free copies of these instructions.

Important Notice

Attention Installer.

This manual contains important information about the installation, operation and safe use of
this product. This information should be given to the owner/operator of this equipment.

CAUTION

Before starting any filter system, be sure the pump has been adequately primed by filling the strainer pot on the
pump with water. Failure to do so will result in pump seal problems.

POOL WATER MAINTENANCE:

Properly treated pool water can prolong the life of your cartridges and insure a sparkling clear pool. Pool
chemistry is a specialized area and you should consult your pool service specialist for specific details.

WARNING

Failure to operate your filter system or inadequate filtration may cause poor water clarity obstructing visibility in
your pool. Poor water quality may result in diving in shallow pool areas, or diving into or on top of obscured
objects, which can cause serious bodily injury or drowning.

Pentair Pool Products

1620 Hawkins Ave., Sanford, NC 27330 • [phone]
10951 West Los Angeles Ave., Moorpark, CA 93021 • [phone]

Rev. D 5-14-01 1 P/N 175685

SECTION I. INSTALLATION & OPERATING INSTRUCTIONS

A. General Information

1. The filter should be mounted on a level concrete slab. Position the
filter so that the instructions, warnings and pressure gauge are
visible to the operator. Also, position the filter so that the piping
connections, control valve and drain port are convenient and
accessible for servicing and winterizing.

2. Install electrical controls (e.g., on/off switches, timers control
systems, etc.) at least five (5) feet from the filter. This will allow
you enough room to stand clear of the filter during system start up.

3. Provide sufficient clearance around the filter to permit visual
verification that the clamp is properly installed, see Figure 1.

4. Provide sufficient space above the filter to remove the filter lid for
cleaning and servicing. This distance will vary with the model of filter you are using. See Table 1 for the
required vertical clearance.

WARNING

Risk of electrical shock or electrocution. Position the filter and the air release to safely direct water drainage
and purged air or water. Water discharged from an improperly positioned filter or valve can create an electrical
hazard that can cause severe personal injury as well as damage property.

Figure 1.

5. Make all plumbing connections in accordance with local plumbing and building codes. Filter plumbing
connections are provided with an O-ring seal. Use only a silicone base lubricant on the O-rings. Do not
use pipe joint compound, glue or solvent on the bulkhead connections.

B. New Pool Installations

1. Initial Start Up - It may require a few days to clear up the pool water due to debris found in the
plumbing lines, plaster dust, etc.

2. Check the pressure gauge periodically for increase in pressure. This is normal the first week of filtering,
and it is suggested that the cartridges be removed and cleaned frequently until the water clears up.

3. Frequent cleaning of the cartridges in this initial period will also help to increase the life of the cartridges
and give you longer filtering cycles thereafter.

C. Suggested Installation

1. A check valve is recommended between the filter and heater to prevent hot water backup from
damaging the filter internals.

2. The maximum operating pressure of the tank is 50 psi. Never operate the unit above this pressure or
attach a pump to this filter that has a shut-off pressure higher than 50 psi.

3. When performing hydrostatic pressure tests or when testing for external leaks of the completed filtration
and plumbing system, ensure that the Maximum Pressure that the filtration system will be subjected to
DOES NOT EXCEED THE MAXIMUM WORKING PRESSURE OF ANY OF THE COMPONENTS
CONTAINED WITHIN THE SYSTEM. In most cases, the maximum pressure will be stated on each
component of the system.

4. If doubt exists as to the pressure to which the system will be
subjected, install an ASME approved automatic Pressure Relief
or Pressure Regulator in the circulation system for the lowest
working pressure of any of the components in the system.

5. Never install a chemical feeder or ozonator upstream of the
filter. Always locate downstream with a check valve between
the feeder and the filter.

Model Size Clearance Req.

DM-75 75 sq. ft. 50 in.

DM-90 90 sq. ft. 50 in.
DM-120 120 sq. ft. 50 in.
DM-180 180 sq. ft. 70 in.
DM-240 240 sq. ft. 70 in.

TABLE 1

Vertical

P/N 175685 2 Rev. D 5-14-01

6.

A positive shut off valve is not recommended downstream of the filter and/or heater. If the system is
ever run with such a valve closed, the internal air vent becomes inoperative and a serious malfunction
could result. “SEE WARNING BELOW”. Also, running the system with this valve shut stops all water
flow, which can damage the equipment.

WARNING

THIS FILTER OPERATES UNDER HIGH PRESSURE. WHEN ANY PART OF THE CIRCULATING
SYSTEM (e.g., LOCK RING, PUMP, FILTER, VALVES, ETC.) IS SERVICED, AIR CAN ENTER THE
SYSTEM AND BECOME PRESSURIZED. PRESSURIZED AIR CAN CAUSE THE LID TO BLOW OFF
WHICH CAN RESULT IN SEVERE INJURY, DEATH, OR PROPERTY DAMAGE. TO AVOID THIS
POTENTIAL HAZARD, FOLLOW THESE INSTRUCTIONS.

1. BEFORE REPOSITIONING VALVES AND BEFORE BEGINNING THE ASSEMBLY, DISASSEMBLY, OR
ADJUSTMENT OF THE LOCK RING OR ANY OTHER SERVICE OF THE CIRCULATING SYSTEM: (A)
TURN THE PUMP OFF AND SHUT OFF ANY AUTOMATIC CONTROLS TO ASSURE THE SYSTEM IS NOT
INADVERTENTLY STARTED DURING THE SERVICING; (B) OPEN THE AIR RELEASE; AND (C) WAIT UNTIL ALL
PRESSURE IS RELIEVED -PRESSURE GAUGE MUST READ ZERO (0).

2. WHENEVER INSTALLING THE FILTER LOCK RING, FOLLOW THE FILTER LOCK RING INSTALLATION
INSTRUCTIONS EXACTLY.

3. ONCE SERVICE ON THE CIRCULATING SYSTEM IS COMPLETE, FOLLOW SYSTEM RESTART

INSTRUCTIONS EXACTLY.

4. MAINTAIN CIRCULATION SYSTEM PROPERLY. REPLACE WORN OR DAMAGED PARTS IMMEDIATELY
(e.g., lock ring, pressure gauge, the air release, O-rings, etc.)

5. BE SURE THAT THE FILTER IS PROPERLY MOUNTED AND POSITIONED ACCORDING TO THE
INSTRUCTIONS PROVIDED.

D. Filter Operation

1. Set valves if any, to filter position.

2. Open the air release on top of filter. Failure to open the air release could cause the lid to separate
resulting in serious bodily injury and/or major property damage.

3. Stand clear of the filter.

4. Start pump and wait until a steady jet of water emerges from the air release, then close valve.

5. Filter will operate efficiently until pressure gauge indicates time for cleaning cartridges. Note these
pressures below. Depending on water conditions and pool usage, the cartridges may be cleaned and
reused several times before replacement is needed.

6. Always stand clear of the filter during operation and when power to the pump is turned on.

Filter Starting Pressure: ___________ psi

Note the pressure at start-up when filter is clean. This will vary rom pool to pool depending on pool line size. Note this
pressure in box.

Cleaning Required at: ___________ psi

Filter requires cleaning when pressure increases 8 - 10 psi over clean filter starting pressure.

E. System Restart Instructions

WARNING

THIS FILTER OPERATES UNDER HIGH PRESSURE. WHEN ANY PART OF THE CIRCULATING SYSTEM
(e.g., LOCK RING, PUMP, FILTER, VALVES, ETC.) IS SERVICED, AIR CAN ENTER THE SYSTEM AND
BECOME PRESSURIZED. PRESSURIZED AIR CAN CAUSE THE LID TO BE BLOWN OFF WHICH CAN
RESULT IN SEVERE INJURY, DEATH, OR PROPERTY DAMAGE. TO AVOID THIS POTENTIAL HAZARD,
FOLLOW THESE INSTRUCTIONS.

Rev. D 5-14-01 3 P/N 175685