Electrical Operation - Linea Rotobomba 500T0800 Owner's Manual

Electrical / Operation
To change or check tank pre-charge pressure:
1. Turn off power to the pump.
2. Close the suction line valve from the storage tank.
3. Open a faucet to drain pressure from the tank.
4. Use an air pressure gauge (same as used on automo-
bile tires), and check the air pressure from the air fit-
ting on top of the tank.
The tank pre-charge pressure should always be 0.138 Bar
(2 PSI) less than the cut-in (start) pressure (see Table I,
Page 4).
Changing Pressure Switch Settings
The pressure switch is pre-set to 2 / 3.4 Bar (30 / 50 PSI).
The pressure cut-off (pump-stop pressure) can be
changed if required.
To change cut-off (pump stop) and cut-on (pump start)
pressure together:
1. Turn off power to the pump.
2. Remove the cover to the pressure switch.
Pressure
Pressure
Adjustor #2
Adjustor #1
Figure 4 – Pressure Switch.
3. Turn pressure-adjustor #1 clockwise to increase both
cut-off and cut-in pressure. Each turn will change the
pressure setting 0.17 Bar (2.5 PSI). Turn the adjustor
counterclockwise to lower the pressure setting.
4. To raise only the cut-off pressure, turn pressure adjus-
tor #2 clockwise. Each turn will change the pressure
setting 0.17 Bar (2.5 PSI). Turn the adjustor counter-
clockwise to lower the pressure setting.
Checking Pressure Adjustment
1. After changing the pressure setting, put the cover on
the pressure switch.
2. Apply power.
3. If the pump does not start up, open a faucet to drain
water from the pressure tank.
4. Watch the pressure gauge and note at what pressure
5. Close the faucet.
6. Watch the pressure gauge and note at what pressure
7. If additional adjustments need to be made, refer to
PRIMING / OPERATION
out water may cause it to overheat, damaging the seal
and possibly causing burns to persons handling the
pump. Fill the pump with water before starting.
closed. To do so can boil water inside the pump, causing
hazardous pressure in the unit, risk of explosion, and
possibly scalding persons handling the pump.
Attach Power
Wires Here
Attach Ground
Wire Here
Figure 5 – Prime the Pump.
Cistern Installation
1. Remove the priming plug from the priming port. Fill
2. Replace all priming plugs (use teflon tape).
3. Power on! Start the pump. If you don't have water in
the pump starts.
the pump stops.
the previous procedure.
Never run pump dry. Running pump with-
Never run the pump with the discharge
Priming
Tee
the pump from the tee and let it vent through the
port. Fill all piping between the pump and the water
source and make sure that all vertical suction piping
is full.
2 minutes, stop the pump and remove the fill plugs.
Refill the pump and piping. You may have to repeat
this several times in order to remove all the trapped
air from the piping. A pump lifting water 15' (4.5m)
may take as long as 15 minutes to prime.
5