• Use Total Tank Volume to size tank. Total tank volume should be approximately 20% of
the pump’s maximum ow rate. Ex., pump maximum ow =10 GPM = 2 gallon Total Vol.
tank.
• If the User Interface Board (UIB) is set for a 5 PSI Pressure Drop adjust the tank pressure
to 20 PSI below the desired system set-point. Ex., 50 PSI system set-point = 30 PSI tank
pre-charge.
• If the UIB is set for a 20 PSI Pressure Drop adjust the tank pressure to 30 PSI below the desired system set-point. Ex., 50 PSI system set-point = 20 PSI tank pre-charge. Each system
is different so this setting may require minor adjustment for optimum performance.
• Large Tanks - installations with large volume tanks may require minor tank pre-charge
pressure adjustments for optimum performance - please see more details in IM229, especially if the system turns On and Off too often or does not turn off.
which controller models
can be used with which
motors. Lighter shading
indicates combinations
where controller will
limit peak performance
to 85% of catalog value
for pump/motor.
③ Circuit Breaker or Dual
Element Time Delay Fuse
Size (Amps) protecting
branch circuit supplying
controller.
④ Minimum size of single
phase 240 V generator
required.
FAULT CODES
No Light: Low Voltage or No Voltage to Controller
Green Light Codes:
• Constant Green - Unit in Standby: system is Off or system detected low
voltage, below 190 VAC and is waiting for voltage to increase to acceptable
level.
• 2 Blinks - Dry Well: controller will restart automatically
• 3 Blinks - Transducer Fault: controller will not run if the signal from the
transducer is disconnected or out of tolerance.
• 4 Blinks - Over Current: controller will attempt to restart three times before
displaying this fault. To clear the fault, turn power off, wait 1 minute, turn
power on. Fault may be caused by setting Overload Dial on too low a setting.
• 5 Blinks - Short Circuit: controller will attempt to restart three times, to clear,
turn power off, wait 1 minute, turn power on.
• 6 Blinks - Ground Fault: controller will not restart - To clear the fault, turn
power off, wait 1 minute, turn power on.
• 7 Blinks - Temperature: controller will restart automatically when the
temperature reaches an acceptable level.
• 8 Blinks - Open Lead: controller will not restart. To clear the fault, turn power
off, wait 1 minute, turn power on.
• 9 Blinks - Low Pressure Cut-off: Controller will not restart. Pressure 20 PSI
below set point for 30 seconds. May be a broken pipe or tripped pressure
relief valve.
Note - In many instances the controller is blamed for faults caused by bad motors, tanks
with incorrect or no air charge, poor wiring and/or improper grounding. Since the SOLO
may be used to retrot an existing installation into a variable speed system, IM229 includes
instructions on checking Motor Insulation Resistance and Winding Resistance. Before
replacing a SOLO drive on a retrot installation please perform these tests to verify the
motor and wire are in good condition and the tank pressure is set properly.