Xylem IM129 R01 BF03S - Manual (Page 7)

7
If a water-logged air cushioning chamber exists, when water
is not being used, which is indicated by a rapid starting and
stopping of the pump, recharge the air cushioning chamber
by disconnecting the copper tube from the air valve, and let
the pump run with a faucet open until air comes out of the
faucet. Then reconnect copper tube with pump running.
To prevent repetition of this condition check air volume
control and air valve.
AIR VOLUME CONTROL
This is not a standard Air Volume Control. Be sure to use
the special model supplied by Goulds Water Technology for
this unit as it has a custom spring tension setting.
WHY IT IS NECESSARY
The turbulence of the water as it passes through the casing
causes it gradually to absorb air. Without air replenishment,
the water level would rise and soon there would be no air in
the cushioning chamber . . . a water logged condition.
The Air Volume Control and Air Valve on Goulds Water
Technology Balanced Flow Water System are vitally impor-
tant parts of the unit. All connection to Air Volume Control
and Air Valve must be air tight. Without these parts oper-
ating properly, satisfactory functioning of the entire unit
cannot be expected.
HOW IT WORKS
The Air Volume Control is installed in the tapped opening
in the air cushioning chamber. It must be connected to the
Air Valve in the body of the water pump with copper tubng.
See figure 5.
The float of the air volume control rises when the water
level rises. The extension of the float rod in the air volume
control (on the outside of the air cushioning chamber)
pushes the valve stem (1) in diagram down, opening valve.
This exposes the end of copper tubing to atmosphere
through hole in nameplate. Suction of the water pump takes
air in through this hole, down the tubing and into the water
pump through Air Valve (2). The air passes into the air
cushioning chamber with the water as it is discharged from
the water pump.
When there is sufficient air in the air cushioning chamber
the water level is at or below the level of the float valve,
valve (1) is closed and no air is drawn in until it is required.
WATER LOGGED (AIR CUSHIONING CHAMBER)
CASING
A pump casing is water logged when there is no air in it . . .
it is filled with water. It can be caused by:
1. Plugged orifice, damaged valve core or ruptured float on
air volume control. To check air volume control and air
valve, proceed as follows:
A. Disconnect copper tube from air volume
control. When pump is running, air should be
drawn into tube. If air is not drawn into tube,
the air valve may be plugged.
Pump must have suction lift to draw air
through tube. See section “INSTALLATION
UNDER POSITIVE SUCTION HEAD”, page 4.
AIR VOLUME CONTROL
CAUTION
B. Remove air valve. Blow through it from tubing
connection side. If plugged, take it apart and
clean. Replace valve core if necessary.
C. Remove replacement valve assembly from the
air volume control and remove the valve core
from the valve body. Hold valve body to the
light and if you cannot see light through it, ori-
fice is plugged. Clean with a needle or very fine
wire. If unable to clean, replace with a new one.
If valve core is damaged, replace with a new one.
2. Air Volume Control may be inoperative due to punctured
float, broken float rod or ruptured diaphragm around
float rod. Replace with new one.
IF WATER LEAKS AROUND AIR VOLUME CONTROL
1. Disconnect copper tubing at Air Volume Control. If leak
comes from tubing, Air Valve in water pump is leaking.
Replace valve core. See figure 5.
2. If water leaks from Air Volume Control when tubing is
disconnected, the control should be replaced.
SEASONAL SERVICE
TO TAKE OUT OF SERVICE
When pump is used during summer months and allowed
to stand idle during the winter, as in summer cottages, it is
necessary that the pump be thoroughly drained to prevent
damage from freezing. To drain unit proceed as follows:
1. Shut off power to pump motor branch circuit.
2. Drain house service lines.
3. Disconnect union in suction line and drain line. If there
is a foot valve on end of suction line it must be removed
and line drained.
4. Remove drain plug near bottom of air cushioning
chamber and allow all water to drain out. Removal of
priming plug will allow pump to vent while draining.
When removing drain plug make sure that tapped open-
ing from which plug is removed is not clogged with scale
or mud. If there is any question of foreign matter in the
opening, it should be cleaned out with a nail or piece of
stiff wire so that water will drain out freely.
5. After pump is completely drained, replace plugs.
TO PLACE PUMP BACK IN SERVICE
1. Make sure drain plug previously removed is tight. Use a
good joint compound on threads and screw in tightly.
2. If well pipes have been removed, reconnect them.
Examine faces of ground union. If scored, pitted or
imperfect, make packing of sheet rubber to insure tight
joint. If foot valve has been removed, reinstall.
3. Remove motor shaft end cap, insert screwdriver in motor
shaft slot and turn clockwise to make sure pump is free.
4. Prime and start. See Priming and Starting and Setting
Switch Instructions.
SEASONAL SERVICE