© Copyright 2019 Zoeller
®
Co. All rights reserved.
5
Checking and Setting Tank PSI
Pressure Tank Charge – Pressure tank air charge should be
checked at regular intervals of every six months and after the
pump has not been used for a prolonged period. To check the
tank pressure, turn off power, open the tap on discharge line
to release pressure from the pump, unscrew the black plastic
cover, and place a pressure gauge on it as shown (FIG 5).
Pressure should be adjusted to the original pre-charge as follows:
350 1/2 HP - 25 psi (1.8 Kg/cm
2
)
355 1 HP - 35 psi (2.5 Kg/cm
2
)
FIG 5 SET TANK PRESSURE
IL1307
NOTE: If using optional water tank (FIG 1), set both tanks to the
same pressure.
GENERAL OPERATION GUIDELINES
1. What Causes The Unit To Start? – The pump will turn ON when
the flow rate is greater than 0.7 GPM or when the pressure
output is less than the pump pressure activation point
(approximately 25 psi - 1/2hp, 35 psi - 1hp).
2. Dry Run Protection - After the unit recognizes a continual low
flow of water, the unit will shut down to protect itself from
running dry. Hourly, it will turn on to sample the water flow
requirements, and return to shut down if running dry. The
home owner can fix the run dry issue and return the pump to
normal operation by unplugging the pump for 5 seconds.
3. Dead Head Protection - If there is no water demand (discharge
is shut off), the unit will shut down to protect the pump from
damage. Once water flow is restarted, the pump will re-start
the power automatically.
4. Rapid Cycle Protection
– If the unit cycles repeatedly on/off,
the unit will shut down to protect the pump life. The optional
water tank not maintaining pressure could be a potential
cause. Hourly, it will turn on to sample the water flow
requirements, and return to shut down if the problem persists.
The home owner can fix the concern and return the pump to
normal operation by unplugging the pump for 5 seconds.
TROUBLESHOOTING
Before ANY work with the pump, SHUT OFF the electrical supply and ball valves #1 and #2 to prevent electrical shock and
water damage.
Problem
Cause
Correction
Pump does not start or shuts down.
No power supply.
Connect the electricity supply.
Incorrect voltage.
Pump is 115 Volt only.
It will not start with 230V supply.
Incorrectly plumbed.
Confirm FIG 1 installation is correct. Confirm ball valves
#1 and #2 are open in suction and discharge. Confirm ball
valve #3 is closed on bypass.
Blocked inlet
Check if pump suction inlet screen is blocked.
See FIG 10.
Insufficient water supply
Ensure water source is providing sufficient water.
Pump starts when no water is
consumed.
Pipe leaking.
Ensure all threads have 3 wraps of Teflon tape + hand tight
+ 1/2 turn with wrench.
Tank pressure is low.
See FIG 5 to check and add air pressure to the tank.
Air in the system.
Ensure all threads have 3 wraps of teflon tape + hand tight +
1/2 turn with wrench. Re-prime unit.
Pump does not shut down when water
is not consumed.
Blocked check valve.
See FIG 8
. Confirm check valve is free of debris and
functions freely.
