Xylem IM213R04 S-Drive Constant Pressure Aquavar SPD Variable Speed Pump Control - Manual (Page 7)

Page 7
Section 4
General
NOTE
All plumbing work must be performed by a qualified technician. Always follow all local, state and provincial
codes.
A proper installation requires a pressure relief valve, a ¼" female N.P.T. threaded fitting for the pressure sensor,
and properly sized pipe. Piping should be no smaller than the pump discharge and/or suction connections.
Piping should be kept as short as possible. Avoid the use of unnecessary fittings to minimize friction losses.
Some pump and motor combinations supplied with this system can create dangerous pressure.
Select pipe and fittings accordingly per your pipe suppliers’ recommendation. Consult local codes
for piping requirements in your area.
All joints must be airtight. Use Teflon tape or another type of pipe sealant to seal threaded connections. Please
be careful when using thread sealant as any excess that gets inside the pipe may plug the pressure sensor.
Galvanized fittings or pipe should never be connected directly to the stainless steel discharge head or casing as
galvanic corrosion may occur. Barb type connectors should always be double clamped.
Pressure Tank, Pressure Relief Valve and Discharge Piping
Use only “pre-charged” tanks on this system. Do not use galvanized tanks. Select an area that is always above
34º F (1.1º C) in which to install the tank, pressure sensor and pressure relief valve. If this is an area where a water
leak or pressure relief valve blow-off may damage property, connect a drain line to the pressure relief valve. Run
the drain line from the pressure relief valve to a suitable drain or to an area where water will not damage
property.
Pressure Tank, System Pressure
Sizing – A diaphragm tank (not included) is used to cushion the pressure system during start-up and shut-down.
It should be sized to at least 20% of the total capacity of your pump. Example: If your pump is sized for 100 GPM
then size your tank for at least 20 gal. total volume, not draw down. Pre-charge your bladder tank to 10-15 PSI
below your system pressure. The controller is pre-set for 50 PSI at the factory. Therefore a 35-40 PSI pre-charge in
your tank would be required. Use the higher tank pre-charge setting if the system drifts over 5 PSI at a constant
flow rate. NOTE: Pre-charge your tank before filling with water!
CAUTION
Maximum working pressure of HydroPro diaphragm tank is 125 psi.
Installing the Pressure Sensor
The pressure sensor requires a ¼" FNPT fitting for installation. Install the pressure sensor with the electrical
connector pointing up to avoid clogging the pressure port with debris. Install the pressure sensor in a straight
run of pipe away from elbows or turbulence. For optimum pressure control install the pressure sensor in the
same straight run of pipe as the pressure tank. Ensure the pressure sensor is within 10ft of the pressure tank.
Installing the pressure sensor far away from the pressure tank may result in pressure oscillations. Do not install
the pressure sensor in a location where freezing can occur. A frozen pipe can cause damage to the pressure
sensor.
Hazardous
Pressure
CAUTION
Hazardous
Pressure
CAUTION
PIPING