Instructions
EZ Boost
TM
System
24
The possible alarms and how to identify them and make
the relevant corrections are described in section 8.2 and
8.4, Service.
7.3.2. Dry-running protection
The purpose of the dry-running protection is to protect the
pump in case of insufficient water flow.
The dry-running protection makes the conventional dry-
running protection unnecessary.
No additional cables to the motor are required. The dry run
settings shown in section 9, Factory Settings, are built into
the pump and automatically transmitted to the EZ Boost
controller.
When air enters the pump together with water, the pump
power decreases, and pressure drops, causing the motor to
increase speed. If the power consumption falls below the
dry run setting for an accumulated time of 5 seconds, and
the motor speed is within 1000 rpm of the max speed the
EZ Boost controller stops the pump and declares a dry run
alarm.
When the motor is stopped, the dry-running indicator light
is permanently on, see fig. 11.
Fig. 11
Fig. 9
7.3. Alarm Functions
The EZ Boost controller continuously receives operating
data from the pump. The alarm functions indicated on
the EZ Boost controller front are described in the following
sections.
7.3.1. Service alarm
If one or more factory-set alarm values are exceeded, the
indicator light for service alarm is permanently on, see fig.
10.
Fig. 10
Possible alarms:
• Sensor defective.
• Overload.
• Over temperature.
• Speed reduction.
• Voltage alarm.
• No contact to pump.
LEZTL01.indd
10/8/2004, 1:39 PM
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