PRESSURE TANK CONNECTION
PRESSURE TANK
(FIG. 3)
Hazardous pressure. To avoid tank blowup,
install relief valve capable of passing full system flow at 75
PSI.
PRESSURE TANK provides reservoir of water under pressure and
maintains cushion of air pressure to prevent pipe hammer and pos-
sible damage to plumbing components. When water is drawn off
through house fixtures, pressure in tank is lowered and pressure
switch starts pump.
STANDARD TANK CONNECTION
(FIG. 4 )
When standard tank is used, air volume control (AVC) adds air to
the tank when needed. To connect AVC to pump, remove 1/8" pipe
plug from pump body near suction port (Fig. 4). Thread 1/8" com-
pression fitting into tapped hole. Cut tubing to length to reach AVC;
assemble to fitting on pump and to AVC on tank. See installation
instructions provided with tank and AVC for details.
PRE-CHARGED TANK CONNECTION
(FIG. 5)
When pre-charged tank is used, no AVC is necessary. Pre-
charged tank contains factory provided air charge.
NOTICE: Your pump pressure switch is set for a 30-50 PSI range
and requires tank pre-charge of 28 PSI for proper operation. See
tank owner’s manual for instructions on checking tank air charge.
An annual check on tank charge is recommended to prevent
excessive running of pump.
4
To service
Priming Plug
Air Volume
Control (AVC)
Remove plug here
816 0993
Figure 4 – Pump on standard tank
Figure 5- Pump on Pre-charged tank
179 0893
WATER
A
B
Pumping Cycle:
1. Tank nearly empty – air expands filling area above bladder (Fig.
A).
2. Water enters tank – air is compressed above bladder as it fills with
water (Fig. B).
3. Pump-up cycle completed – air compressed to OFF setting of
pressure switch (Fig. C).
4. Water drawn from tank – compressed tank air forces water out of
bladder (Fig. D).
5. Bladder empty – new cycle ready to begin (Fig. A).
Figure 3-Tanks
WATER
WATER
C
D
157 0893
