A. O. Smith SPMD-119, PMI-2 Installation Manual

• Safety Instructions

• Installation

• Warranty

Installation Manual

DIAPHRAGM WELL TANK

IN-LINE SERIES:

2-5 & 7 GALLON

VERTICAL SERIES:

14-20-32-36-52-86-96-1 19 GALLON

HORIZONTAL

SERIES:

7-14 & 20 GALLON

KEEP THIS MANUAL FOR FUTURE REFERENCE WHENEVER MAINTENANCE ADJUSTMENT OR SERVICE IS REQUIRED.

Water Systems • 4302 RALEIGH STREET • CHARLOTTE, NC 28213

PRINTED 0809 205621-001

1

IMPORTANT INSTRUCTIONS BEFORE INSTALLATION

FAILURE T O FOLLOW THESE INSTRUCTIONS MAY CAUSE SERIOUS
BODIL Y INJURY AND/OR PROPER TY DAMAGE.

1. All piping and electrical wiring must adhere to state and local codes.
Check with appropriate community agencies, or contact your local
electrical and pump professionals.

2. Install tank as close as possible to the pump pressure switch to
reduce friction loss and elevation difference between the tank,
water supply main, and switch.

3. After installation, be sure the pressure switch is set low enough to
shut the pump off. If all valves are closed and the pressure switch
setting is too high, the pump will run continuously without water
flow causing overheating and damage to the pump.

4. A pressure relief valve must be installed in the piping adjacent to the
pump tank.

5. The following may cause severe damage to tank and/or piping and
will void warranty.

• Failure to protect tank against below-freezing temperatures.

• Pumping chemicals or corrosive liquids.

• Pumping gasoline or other flammable liquids.

• Operation at pressures greater than rated pressure on data plate
with no relief valve.

• Pumping liquids hotter than 120°F .

Improper installation, adjustment, alteration, service or maintenance can
cause DEATH, SERIOUS BODIL Y INJUR Y , OR PROPERTY DAMAGE.
Refer to this manual for further assistance.

Failure to follow these instructions can cause tank to explode and result
in DEA TH, SERIOUS BODILY INJURY , OR PROPER TY DAMAGE.

Install a 100P .S.I. or less pressure relief valve directly into a fitting of the
plumbing. Position the valve downward and provide tubing so that any
discharge will exit only within 6 inches above, or at any distance below
the structural floor. Be certain that no contact is made with any live
electrical part. The discharge opening must not be blocked or reduced in
size under any circumstances. Excessive length, over 15 feet, or in use
of more than two elbows can cause restriction and reduce the discharge
capacity of the valve.

No valve or other obstruction is to be placed between the relief valve
and the tank. Do not connect tubing directly to discharge drain unless a
6” air gap is provided. T o prevent bodily injury or hazard to life, the valve
must be able to discharge large quantities of water should circumstances
demand. If the discharge pipe is not connected to a drain or other
suitable means, the water flow may cause property damage.

The Discharge Pipe:

• Must not be smaller in size than the outlet pipe size of the valve, or
have any reducing couplings or other restrictions.

• Must not be plugged or blocked.

• Must be installed so as to allow complete drainage of both the pressure
relief valve, and the discharge pipe.

• Must not have any valve between the relief valve and tank.

The complete pump, tank pressure relief valve, pressure switch and
piping system MUST be protected against below freezing temperature.
Failure to do so could cause tank to explode and result in DEATH,
SERIOUS BODILY INJUR Y , OR PROPERTY DAMAGE.

This pump tank is designed and intended for cold (ambient temperature)
water storage at a maximum pressure of 100 PSIG , any use other than
with cold water, or at a sustained or instant aneous pressure in excess
of 100 PSIG is UNSAFE. A pressure relief valve of adequate size must
be incorporated in the system. The relief valve must be selected to pass
the full capacity of the pump when the pressure in this tank is 100 PSIG
or more. Consult pump manufacturer for pump capacity at relief pressure.
The manufacturer of this tank does not accept any liability or other
responsibility for personal injury or property damage resulting from
improper use, installation, or operation of this tank, or of the system of
which it is a part.

The pump tanks are designed for operation on water systems with
working pressure not to exceed 100 PSI. Pressure exceeding this could
become hazardous, and will void any and all guarantees, either written,
or implied.

IMPORT ANT

It will be necessary to expel all air from piping after new installations,
repriming and after pumps have been disassembled for repair. T o purge
the air, first open a faucet the greatest dist ance from the pump. With the
pump being allowed to run, wait until a steady stream of water is
coming from the faucet. At this time, close the faucet for several short
intervals.

If, after this, air in the lines still occur, check on the suction side of the
pump for piping leaks.

When standard type tanks are replaced with this tank, all air charging
devices, bleeder orifices, and air volume controls must be removed.

The pump tank has been shipped with a factory precharge as indicated
on the tank label. If your pump start-up pressure is different from the
factory precharge, adjust the tank pressure with the empty tank to your
pump start-up pressure. This can be accomplished by simply bleeding
air from valve in the top of the tank with an accurate pressure gauge.
Using the same standard air charging valve in the top tank, a tire pump
can be used to raise the tank pressure. Raise the pressure slowly,
checking it periodically with an accurate tire pressure gauge, until the
desired pressure is reached.

2

FEA TURES AND OPERA TING CYCLES

SHELL constructed of light-weight

drawn steel with epoxy finish provides
extra corrosion-resistance.

STRONG AND FLEXIBLE BUTYL
DIAPHRAGM assures dependable

tank service even with pressures up
to 100 PSI.

DIAPHRAGM SEAL consists of
locking retainer ring for positive
separation of air and water .

LINING protects inner shell against
rust in water reservoir.

ST ART-UP CYCLE

The diaphragm is pressed
against the bottom of the air
chamber

FILL CYCLE

Water is pumped into the
reservoir, which forces the
diaphragm upward into the air
chamber .

HOLD CYCLE

Pump attains cut-off pressure.
Diaphragm reaches uppermost
position. Reservoir is filled to
capacity.

3

DELIVERY CYCLE

Pump remains off while
pressure in air chamber forces
diaphragm downward to
deliver water.