Xylem IM244R04 SPD Plus Variable Speed Pump Control - Manual (Page 10)

10
SECTION 4: PIPING
(CONTINUED)
PRESSURE TANK, SYSTEM PRESSURE
Sizing – A bladder 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 15-20 PSI below your system pressure. 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
bladder tank is 125 psi.
INSTALLING THE PRESSURE SENSOR
The pressure sensor requires a ¼" NPT 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 10 feet 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.
The pressure sensor cable must be wired to the
controller control terminals. The pressure sensor
cable wiring diagram is shown in Section 6. The cable
can be shortened for a cleaner installation. Longer
cable lengths are available, consult factory. Maximum
recommended pressure sensor cable length is 300
feet. Avoid leaving a coil of pressure sensor cable as
this can induce unwanted transient voltages and noise
into the system. Do not run the pressure sensor cable
alongside the input or output wiring for more than 1
foot. Maintain a distance of at least 8” between the
pressure sensor cable and input or output wiring.
Hazardous
Pressure
CAUTION
Ensure the pressure sensor cable is connected as
follows: Brown to terminal 10 (24VDC SUPPLY), White
to terminal 5 (AI2, TRANSDUCER FEEDBACK), Drain to
SCR Terminal 1. Connecting the Drain wire to the SCR
Terminal electrically connects the sensor case to the
chassis of the controller. In some cases this drain wire
must be disconnected from the controller chassis. In
cases where there is grounded metal piping which is
continuous between the transducer and the motor or
the transducer is installed in grounded metal piping,
a ground loop can result so the drain wire must be
disconnected from the chassis. In cases where there
are sections of nonmetallic piping between the
transducer and motor or the transducer is installed
in ungrounded piping this drain wire should be
connected to the controller chassis.
SECTION 5: MOUNTING THE
CONTROLLER
GENERAL
Mount the controller in a ventilated, shaded area.
The controller must be mounted vertically. Be sure
to leave 8 inches of free air space on every side of
the unit. The controller must be in an area with an
ambient between 5 ºF (-15 ºC) and 122 ºF (50 ºC).
If installation is above 3300 feet above sea level,
ambient temperatures are derated 1% per 330 feet
above 3300 feet. The altitude limit for this controller is
6600 ft. Do not install above 6600 ft.
NOTE
Do not block the heat sink (fins) and fans and do not
set anything on the units.
WARNING
The controller access cover should
always be securely fastened to the con-
trol box due to the dangerous voltage/
shock hazard inside the unit.
NOTE
Controllers with an N1 suffix have a NEMA 1 enclo-
sure and are rated for indoor use only.
WARNING
Hazardous
voltage