Discharge Pipe And Pressure Tank Connections - Pentair Myers MFL Serie Manual Del Usuario

Discharge Pipe and Pressure Tank Connections

PRE-CHARGE TANK CONNECTION (Figure 6)
If your system uses a pre-charged tank, it should be con-
nected to the pump as shown in Figure 6. The relief
valve must be capable of passing the entire pump capac-
ity at 100 PSI pressure.
Check the pre-charge of air in the tank with an ordinary
tire gauge. the pre-charge is measured when there is no
water pressure in the tank. Disconnect power to the
pump and drain the tank before checking the pre-charge.
Your pump has a 30/50 PSI switch, so the tank pre-
charge pressure should be 28 PSI (that is, it should be 2
PSI lower than the cut-in pressure of the pressure switch.
No AVC is required for a pre-charged tank; the 1/8" NPT
AVC port on the pump body should be plugged.
Pressure Gauge
and Priming
Plug
Pressure
Switch
Figure 6: Pre-charged Tank Connections
To Household
Water System
Relief
Valve
From
Well
STANDARD TANK CONNECTION (Figure 7)
If your system uses a standard tank, connect it to the
pump as shown in Figure 7. The relief valve used with a
standard tank must be capable of passing the entire
pump capacity at 75 PSI pressure.
Connect the Air Volume Control (AVC) tube to the 1/8"
NPT AVC port on the pump body. Run the tubing from
the pump's AVC port to the AVC mounted on the tank.
See the instructions provided with tank and AVC for
details.
To Household
Water System
Priming Tee
and Plug
Relief Valve
Pressure
Switch
Figure 7: Standard Tank Connections
Sealing Pipe Joints
Use only Teflon tape or Teflon based joint com-
pounds for making all threaded connections to the
pump itself. Do not use pipe joint compounds on
plastic pumps: they can react with the plastic in
pump components. Make sure that all pipe joints in
the suction pipe are air tight as well as water tight. If
the suction pipe can suck air, the pump will not be
able to pull water from the well.
Air Volume
Control
Air Volume
Control Tube
276 0395
From
Well
5