Xylem IM255 AQUAVAR Intelligent Pump Controller - Manual (Page 55)

Piping connections
NOTICE:
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 diaphragm tank, a 1/4” female NPT
threaded fitting for the pressure sensor, and properly sized pipe. Piping should be no
smaller than pump discharge and/or suction connections. Piping should be kept as short
as possible. Avoid the use of unnecessary fittings to minimize friction losses.
CAUTION:
Use pipes suited to the maximum working pressure of the pump. Failure to do so can
cause the system to rupture, with the risk of injury.
All joints must be airtight. Use Teflon tape or another type of pressure 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.
WARNING:
Do not install any valves (except check valves), flow control devices or filters between the
pressure transducer and the pump. It is allowable to run branches off the pipe between
the pump and transducer as long as no flow restricting devices are between the pump
and transducer.
Diaphragm 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 34°F (1.1°) 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 fro
the pressure relief valve to a suitable drain or to an area where water will not damage
property.
Diaphragm tank, system pressure
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. For
example: If your pump is sized for 100 GPM then size your tank for at least 20 gallon total
volume, not draw down. Pre-charge your bladder tank to 15–20 PSI below your system
pressure. The controller is pre-set for 50 PSI at the factory. Therefore a 30–35 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.
The maximum working pressure of the HydroPro diaphragm tank is 125 PSI.
CAUTION:
Exceeding the working pressure of the tank can cause the tank to rupture or explode.
Installing the pressure sensor
The pressure sensor requires a 1/4” 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
Mechanical Installation
Aquavar ® Intelligent Pump Controller INSTRUCTION MANUAL 53