KELCO E20 Series Instruction Manual

WARNING
Please read this installation sheet fully and carefully. The E20
Pressure Switch is a mains voltage device. Death or serious
injury may result if this product is not correctly installed and
used.
INTRODUCTION
The E20 loss of prime pressure switch is a microprocessor controlled
solid-state pressure switch. It is designed for controlling the operation
of a pump and for protecting it against running dry. The E20 features an
adjustable trip point that can be set to stop a pump if pressure falls to
below the system’s normal operating range. The trip point feature has an
automatic 30-second time delay buffer built in to allow normal pressure
fluctuations to be ignored. System pressure can drop to below the trip
point setting for up to 30 seconds without triggering the trip and alarm
feature. The E20 also has a fine tune zeroing adjustment that allows the
pressure switch to be calibrated accurately to any required pressure
within its range. The fine tune adjustment dial can also be used to offset
the entire operating range of the switch and to select pressure set points
that may lie in between the main dial graduations of the switch.

WARNING
The E20 pressure switch is water resistant to IP67. This rating
only applies if the clear control lid is in place and its two
fixing screws fully tightened. The E20 is not water resistant
unless the clear lid is in place and fully secured. Always
replace the clear lid and fully tighten its two screws after
making changes to the settings. The E20 may present a shock
hazard and death or serious injury may result if water enters
the E20’s electrical housing. There are no user serviceable
parts in this pressure switch. Under no circumstances should
the main housing be opened. Warranty on this product is
automatically void if the sealed body screws are opened.
IMPORTANT
This installation and usage information sheet must be read with reference
to the specific model controller being installed. The power switching
capacity and the pressure rating of the controllers vary from model to
model and it is very important to understand the limitations of a specific
controller before installing it.
SUPPLY VOLTAGE
CABLE
NO LETTER = 10Amp PLUG & PLAY
HD = HEAVY DUTY 15Amp CABLES 2 X 2M LONG
S = SINGLE CABLE 2M LONG WITH 4 or 5 CORES
CABLE CORES
4 = 4 CORE 10Amp CABLE
5 = 5 CORE 6Amp CABLE
E20 - 240 - S - 5
PRESSURE RANGE
20 = 0 to 20Bars
240 = 220 TO 240VAC
24 = 24V AC or DC
OPERATING ENVIRONMENT
Ambient Temperature Range 1ºC to 50ºC
Liquid Temperature Range 1ºC to 60ºC, See note below
Ingress Protection Rating IP67
Supply E20-240 (240VAC Model) 220 to 240VAC 50Hz
Supply E20-24 Low Voltage
AC/DC Model
12 to 28Volts AC or DC at 80mA
Max
Maximum Operating Pressure 20 Bars (300 psi)
OPERATING RANGE
Start-up Timer Automaticand limited to 30 seconds
Max.
Cut out Pressure Adjustable from 2 to 20 Bars in 16
steps
Cut in Pressure Adjustable from 1 to 19 Bars in 16
steps
Trip Pressure Adjustable from 0 to 18 Bars in 16
steps
Fine Tune Adjustment Adjustable Range +/-1 Bar in
16 steps
Minimum Differential Pressure
On to Off
1 Bars (100kPa)~(14.7 psi)
Maximum Differential Pressure
On to Off
19 Bars (1900kPa)~(274psi)
Maximum Switched Load
E20-240 (Plug & Play Model)
240VAC 50Hz 2.4kW (Motors up to
3HP)
Maximum Switched Load
E20-240-HD Model Only
240VAC 50Hz 3.75kW (Motors up
to 5HP)
Maximum Switched Load
E20-240-S-4
240VAC 50Hz 2.4kW (Motors up to
3HP)
Maximum Switched Load
E20-240-S-5
240VAC 50Hz 6 Amps. For control
circuit applications only
Maximum Switched Load
E20-24-S-5
240VAC 50Hz 6 Amps. For control
circuit applications only
Operating Pressure Range 0 to 20 Bars (0 to 300psi) See note
below
Burst Pressure 45 Bars (650psi)
SAFETY WARNING NOTE: The E20 pressure switch must not be used in
hot water applications >60ºC.
The E20 pressure switch is designed to operate at pressures up to 20
Bars (300 psi), and must not be used in applications where either the
static or dynamic pressure exceeds this rating.
INSTALLATION
The E20 is suitable for use in all cold-water based applications, such
as potable water, seawater, bore water, chlorinated pool water, brackish
water or effluent. A suitable location should be selected for the pressure
switch in the delivery pipework of the pump. The pressure switch should
be installed in a location that is away from both vibration and heat,
preferably out of direct exposure to the weather and above any flood
level. Drill and tap a 1/4” BSP thread in the pipework at the required
location and fit the E20 pressure switch using a 1/4” brass or stainless
nipple (not supplied). The E20 can be mounted in any orientation required
in either vertical or horizontal pipework.
Apply a suitable thread sealant tape or thread paste and screw the E20
pressure switch and its interposing nipple into the pipework, using the
spanner flats provided. When properly installed the controller should
be square to the axis of the pipe with the top controls in an accessible
position.
INSTALLING AND USING
THE KELCO E20 LOSS OF PRIME PRESSURE SWITCH

ELECTRICAL
IMPORTANT
The standard E20-240 pressure switch is not suitable for control circuit
applications. It includes a solid-state drive system that is specifically
designed for the direct control of pump motors. Where control circuits
are to include an E20, including contactor, relay and timer logic circuits,
use only the E20-S-5. Switches designated S-5 are specifically for low
wattage control circuit applications and do not include the solid-state
drive system found in the standard switches.
The E20 pressure switch requires a stable supply voltage in order to
operate correctly. Pay particular attention to cable sizes and ensure
cables are adequate for the specific pump motor load. This is particularly
important where long cable runs are to be used in the installation. If the
voltage drop associated with the starting of the pump motor is excessive
the E20 will automatically reset and this may cause the pump to jog.
Jogging can snap the main spindle of a pump very easily, so please take
all precautions to ensure the voltage supply to the E20 is stable and that
the current carrying capacity of the cable is adequate for the job.
Never use long or coiled extension leads to connect a pump to the E20.
The plug and play E20 pressure switch is supplied fitted with a 10 Amp
plug and socket. Pumps up to 2.4kW can be plugged directly into the
socket connection to the pressure switch.
For mains voltage applications we recommend that the supply to the
E20 be isolated by a 10Amp RCD that has a maximum trip current
of 30mA.
WARNING
When installing the E20, the socket outlet connection
(GPO) for the input power must be accessible and must be
positioned in a dry and protected location out of the weather
and above any flood or water level. Where the E20 is to be
used to control pump motors up to 2.4kW 3HP the supply to
the E20 must be protected by a 10 Amp fuse or by a 10 Amp
circuit breaker.
FIXED INSTALLATION
WARNING
Mains voltage fixed Installations must only ever be carried
out by a licensed electrician and must conform to local
wiring rules.
The E20-240 can directly control single-phase 240V~ 50Hz pump motors
up to 2.4kW. When used in a fixed installation a disconnecting device such
as a switch or a circuit breaker must isolate the E20. The disconnecting
device must be easily and readily accessible after installation. Where a
circuit breaker is used it must be rated at 10 Amp. Where an isolation
switch is used the circuit must be protected by a 10 Amp fuse. In the
interests of safety a 10 Amp RCD with a maximum 30mA trip should also
be installed in the supply
MODEL E20-240-HD ONLY
WARNING
The E20-240-HD is supplied with heavy duty flying leads for
fixed installation use only. It must be installed by a licensed
electrician and isolated by a 15Amp fuse or a 15Amp circuit
breaker.
BROWNOUT OR BLACKOUT
If a blackout or brownout occurs while the E20 is operating, the pressure
switch will not retain any memory of its previous state. It will simply shut
down the pump. When power resumes, the E20 will reboot, restart the
pump and run the start-up time from the beginning. A manual reboot can
be done at any time by simply pressing the reset button on the top deck
of the pressure switch.
BASIC WIRING DIAGRAMS
SINGLE PHASE 220 /240VAC SUPPLY FROM CIRCUIT BREAKER
SINGLE PHASE INSTALLATION USING 5 CORE CABLE SWITCH FOR ALL LOW WATTAGE
CONTROL CIRCUIT APPLICATIONS
SINGLE PHASE 220 /240VAC SUPPLY FROM CIRCUIT BREAKER
TYPICAL SINGLE PHASE PUMP INSTALLATION USING A 4 CORE CABLE SWITCH
3 PHASE 415VAC SUPPLY FROM CIRCUIT BREAKER
TYPICAL 3 PHASE INSTALLATION USING 5 CORE CABLE SWITCH
TO CONTROL THE PUMP MOTOR CONTACTOR
UNIVERSAL LOW VOLTAGE AC / DC SWITCH FOR GENERAL PURPOSE CONTROL CIRCUIT APPLICATIONS
CONNECT BROWN WIRE TO LOW VOLTAGE
AC OR DC SUPPLY. FOR AC CONNECT IT TO
THE SUPPLY ACTIVE. FOR DC CONNECT IT
TO THE SUPPLY POSITIVE.
BROWN WIRE
BLUE WIRE
GRAY WIRE
BLACK WIRE
GREEN / YELLOW WIRE
EARTH
CONNECT BLACK WIRE TO LOW VOLTAGE
AC OR DC SUPPLY. FOR AC CONNECT IT TO
THE SUPPLY NEUTRAL. FOR DC CONNECT IT
TO THE SUPPLY NEGATIVE.
NOTE
GRAY WIRE & BLUE WIRE
ARE SUPPLIED AS VOLTAGE
FREE NORMALLY OPEN
CONTACTS, 240VAC 6Amps
MAXIMUM LOAD
NOTE
GRAY WIRE & BLUE WIRE
ARE SUPPLIED AS VOLTAGE
FREE NORMALLY OPEN
CONTACTS 6Amps MAX. LOAD
3 PHASE PUMP MOTOR
CONTRAL CIRCUIT
BREAKER OR FUSE CONTACTOR
COIL 220 / 240V
& THERMAL OVERLOAD
BROWN WIRE
BLUE WIRE
GRAY WIRE
BLACK WIRE
GREEN / YELLOW WIRE
EARTH
SUPPLY TO SWITCH
220 / 240VAC
BROWN WIRE
BLUE WIRE
GRAY WIRE
BLACK WIRE
GREEN / YELLOW WIRE
EARTH
NOTE
GRAY WIRE & BLUE WIRE
ARE SUPPLIED AS VOLTAGE
FREE NORMALLY OPEN
CONTACTS 6Amps MAX. LOAD
BROWN WIRE
BLUE WIRE
BLACK WIRE
GREEN / YELLOW WIRE
EARTH
SUPPLY TO SWITCH
220 / 240VAC SINGLE PHASE PUMP MOTOR
220 / 240VAC 2.4kW MAXIMUM
4 CORE CABLE SWITCHES ARE
NOT FOR THE CONTROL CIRCUIT
APPLICATION THEY ARE
STRICTLY FOR THE DIRECT
CONTROL OF PUMP MOTORS
UP TO 2.4kW MAXIMUM
IMPORTANT
4 CORE CABLE SWITCHES ARE NOT SUITABLE FOR CONTROL CIRCUIT APPLICATIONS
THEY ARE STRICTLY FOR THE DIRECT CONTROL OF PUMP MOTORS AS SHOWN ABOVE
THEY HOUSE A POWERFUL SOLID STATE DRIVE SYSTEM THAT WILL NOT WORK IN LOW
WATTAGE CONTOL CIRCUITS
5 CORE CABLE SWITCHES ARE NOT SUITABLE FOR THE DIRECT CONTROL OF PUMP MOTORS
THEY ARE FOR THE CONTROL OF CONTACTORS, RELAYS, TIMERS, PLC’S, VS DRIVES
AND OTHER LIGHT DUTY CONTROL CIRCUIT APPLICATIONS
A
N
A
N
L3
L2
L1
N
SINGLE PHASE 220 /240VAC SUPPLY FROM CIRCUIT BREAKER
SINGLE PHASE INSTALLATION USING 5 CORE CABLE SWITCH FOR ALL LOW WATTAGE
CONTROL CIRCUIT APPLICATIONS
SINGLE PHASE 220 /240VAC SUPPLY FROM CIRCUIT BREAKER
TYPICAL SINGLE PHASE PUMP INSTALLATION USING A 4 CORE CABLE SWITCH
3 PHASE 415VAC SUPPLY FROM CIRCUIT BREAKER
TYPICAL 3 PHASE INSTALLATION USING 5 CORE CABLE SWITCH
TO CONTROL THE PUMP MOTOR CONTACTOR
UNIVERSAL LOW VOLTAGE AC / DC SWITCH FOR GENERAL PURPOSE CONTROL CIRCUIT APPLICATIONS
CONNECT BROWN WIRE TO LOW VOLTAGE
AC OR DC SUPPLY. FOR AC CONNECT IT TO
THE SUPPLY ACTIVE. FOR DC CONNECT IT
TO THE SUPPLY POSITIVE.
BROWN WIRE
BLUE WIRE
GRAY WIRE
BLACK WIRE
GREEN / YELLOW WIRE
EARTH
CONNECT BLACK WIRE TO LOW VOLTAGE
AC OR DC SUPPLY. FOR AC CONNECT IT TO
THE SUPPLY NEUTRAL. FOR DC CONNECT IT
TO THE SUPPLY NEGATIVE.
NOTE
GRAY WIRE & BLUE WIRE
ARE SUPPLIED AS VOLTAGE
FREE NORMALLY OPEN
CONTACTS, 240VAC 6Amps
MAXIMUM LOAD
NOTE
GRAY WIRE & BLUE WIRE
ARE SUPPLIED AS VOLTAGE
FREE NORMALLY OPEN
CONTACTS 6Amps MAX. LOAD
3 PHASE PUMP MOTOR
CONTRAL CIRCUIT
BREAKER OR FUSE CONTACTOR
COIL 220 / 240V
& THERMAL OVERLOAD
BROWN WIRE
BLUE WIRE
GRAY WIRE
BLACK WIRE
GREEN / YELLOW WIRE
EARTH
SUPPLY TO SWITCH
220 / 240VAC
BROWN WIRE
BLUE WIRE
GRAY WIRE
BLACK WIRE
GREEN / YELLOW WIRE
EARTH
NOTE
GRAY WIRE & BLUE WIRE
ARE SUPPLIED AS VOLTAGE
FREE NORMALLY OPEN
CONTACTS 6Amps MAX. LOAD
BROWN WIRE
BLUE WIRE
BLACK WIRE
GREEN / YELLOW WIRE
EARTH
SUPPLY TO SWITCH
220 / 240VAC SINGLE PHASE PUMP MOTOR
220 / 240VAC 2.4kW MAXIMUM
4 CORE CABLE SWITCHES ARE
NOT FOR THE CONTROL CIRCUIT
APPLICATION THEY ARE
STRICTLY FOR THE DIRECT
CONTROL OF PUMP MOTORS
UP TO 2.4kW MAXIMUM
IMPORTANT
4 CORE CABLE SWITCHES ARE NOT SUITABLE FOR CONTROL CIRCUIT APPLICATIONS
THEY ARE STRICTLY FOR THE DIRECT CONTROL OF PUMP MOTORS AS SHOWN ABOVE
THEY HOUSE A POWERFUL SOLID STATE DRIVE SYSTEM THAT WILL NOT WORK IN LOW
WATTAGE CONTOL CIRCUITS
5 CORE CABLE SWITCHES ARE NOT SUITABLE FOR THE DIRECT CONTROL OF PUMP MOTORS
THEY ARE FOR THE CONTROL OF CONTACTORS, RELAYS, TIMERS, PLC’S, VS DRIVES
AND OTHER LIGHT DUTY CONTROL CIRCUIT APPLICATIONS
A
N
A
N
L3
L2
L1
N

No. DESCRIPTION FUNCTION
1 MASTER RESET BUTTON With power on, press this button to start the pump at any time. Always press it after making any changes to the settings
on the 4 dials. Any changes you have made will not take effect until you press the reset button. This button can be
pressed at any time even if the pump is running. The start timer is reset to zero when the reset button is pressed.
2 FINE TUNE SETTING This dial allows the entire pressure range of the switch to be shifted up or down in a series of fine steps. In effect, it
allows the pressure switch to be zeroed in against any pressure within the overall range of 20 Bars. Using the fine tune
dial it is possible to set the switch cut in, cut out or trip at virtually any point above or below the settings on the main
turn on, turn off and trip dials.
3 TRIP POINT This dial allow you to set the pressure at which the E20 will turn off the pump should the pressure ever fall to this level.
The dial can be set from zero to 18 bars, in steps of 1.2 Bars. When the system is first turned on the start-up timer will
run the pump for up to 30 seconds, ignoring the fact that the pressure may be low. The pressure must rise to higher
than the trip point setting before the start timer times out. If it fails to do so, the E20 will shut the pump down and flash
its red warning light (8). Pressing the master reset button (1) will cause the E20 to start the pump and attempt to raise
the pressure to within the pumps normal operating range.
4 TURN ON This dial sets the low-pressure limit of the normal operation of the pump. The pump will switch on when the pressure
drops to this level. It is adjustable from 1 to 19 Bars in 16 steps of 1.2 Bars each.
5 TURN OFF This dial sets the high limit of the normal operating range of the pump. The pump will switch off when the pressure
reaches this setting. It is adjustable from 2 to 20 Bars in 16 steps of 1.2 Bars each.
6 START TIMER LED This light flashes rapidly blue whenever the start timer is running. This light will go out as soon as the system pressure
rises to above the trip point pressure setting (3). If the pressure fails to reach the required level this light will stay on until
the end of its fixed 30 second set time and then the pump will stop and alarm light (8) will flash rapidly red to indicate
a problem. This light also switches on steady blue for up to 30 seconds each time the pressure drops to below the trip
point pressure setting (3). During the 30 second time out the pump continues to run and attempts to bring the pressure
back above the trip point. If the pressure fails to rise to above the pressure set on the trip dial (3) by the end of the 30
second timeout the pump will shut down and the alarm light (8) will flash rapidly red to indicate loss of pressure.
7 NORMAL RUN LED This light will show a steady green whenever the pump is operating within its normal pressure range. It means all is OK.
8 ALARM & STOP LED This light shows steady red whenever the pump has stopped on high pressure. It means there is no demand for water
and the pump has stopped on its normal high pressure cut out. This light also flashes rapidly red if there is a problem. If
the pump has lost pressure or has been run dry, this light will flash rapidly red. It means the E20’s loss of prime feature
has been activated and has stopped the pump.
TYPICAL PRESSURE SYSTEM
AIR CELL
DISCHARGE
PUMP
SUCTION
E20 PRESSURE
SWITCH
ADJUSTING SETTINGS
There are 4 rotary switches located under the clear cover on the top
deck of the E20. These 4 dials are for adjusting the pressure settings that
control the E20’s actions. To access the 4 dials undo the 2 screws that
hold the clear cover in place. Note that the clear cover must always be
replaced and tightened after making changes to the settings.

WARNING
Without the cover in place the E20 is not water resistant and
presents a potential shock hazard. Take great care not to
splash water onto the E20 when the control cover is removed
and always replace the cover immediately and fully tighten its
securing screws after any changes to the settings are made.
After you make any change to the settings on the 4 control dials you
must always press the reset button for the changes to take effect.
1
2
3
4
5
6
7
8

LOW PRESSURE
DIFFERENTIAL SYSTEMS
It is often highly desirable to maintain a fairly constant pressure in pipe
systems, for example in a stock watering system where long runs of
pipe are involved and draw off at the stock trough’s is highly variable.
Controlling a pressure pump in such systems can be very difficult. A
pump under the control of an E20 pressure switch can be set to
differentiate between very small pressure changes. The turn on pressure
on the E20 can be set to as little as 1Bar (100kPa) less than the turn off
pressure. This is often a sufficiently small difference in pressure to detect
and respond to the pressure drop that occurs when a remote stock trough
float valve opens. When the flow demand ceases, the E20 can detect and
shut the pump down on the small pressure rise that occurs when the
stock trough float valve closes. The E20 will then monitor the pressure
and restart the system whenever the pressure drops again. In such a
system, air cell pressure or simply line pressure is lost as stock drink.
Often this slight drop in pressure is too low to be detected by a normal
mechanical pressure switch. An E20 can automatically start the pump
and run it for however long it takes for the line to re-pressurise. This may
take hours or minutes and may vary considerably from time to time. If for
any reason flow is lost while the pump is running, this will be detected
by the E20 and the pump will be automatically shut down by the E20’s
loss of prime feature.
AIR CELLS AND PUMP STARTS
An air cell is normally required in a pressure pump system to store pressure
energy and provide hysteresis to prevent the pump from rapidly hunting
or cycling on and off. A large capacity air cell will reduce the frequency
of starting and thus the cycling of the pump. A small draw off air cell
will give a more constant pressure but at the expense of more frequent
starting. Most pumps have a limit to the number of times per hour that
they should be started. This is particularly important with bore pumps as
excessive cycling easily damages submersible motors. Care should be
taken to ensure the draw off capacity of the air cell used is sufficient to
keep pump starts within the pump manufacturer’s recommended limit.
LIMITATIONS
Depending on the specific model the E20 loss of prime pressure switch
requires a stable 220 to 240V AC 50Hz supply in order to operate
properly. Where large pumps are connected to an E20 care should be
taken to ensure cable sizes are adequate. Never use the E20 with long
or coiled extension leads or on generator sets. The electronics built into
the E20 are protected against surges and brownouts and these protection
systems can be triggered by voltage drop, severe voltage spikes, or by an
erratic electrical supply.
The E20 pressure switch should only be used in ambient temperature
water applications. It is neither designed for, nor is it intended to be
used with liquids other than water. The E20 pressure switch must never
be used in hot water applications (greater that 60ºC) and must also be
protected from freezing in cold water applications.
The E20 is designed to withstand water pressures up to 20 Bars (300 psi)
and must not be used in applications where either the static or dynamic
pressure exceeds this rating.
WARNING
If the E20 Loss of Prime Pressure Switch is used in a manner
not specified by the manufacturer the protection provided
by the device may be impaired or negated. In addition, all
warranties stated or implied will be rendered invalid.
MADE IN AUSTRALIA BY KELCO Engineering Pty Ltd
ABN 20 002 834 844
Head Office and Factory: 9/9 Powells Road BROOKVALE 2100 AUSTRALIA
Postal Address: PO Box 496 BROOKVALE NSW 2100
Phone: [phone] Fax: [phone]
Email: [email protected] Web: www.kelco.com.au
PLEASE NOTE: The Kelco E20 Pressure Switch is the subject of Australian and international patent and trademark applications.
Kelco Engineering Pty Ltd reserves the right to change the specification of this product without notice. Kelco Engineering Pty Ltd accepts no liability
for personal injury or economic loss as a consequence of the use of this product. All rights reserved copyright Kelco Engineering Pty Ltd © 2010
STARTING THE SYSTEM
In a typical pressure system the E20 should be set to turn the pump
on at some nominal starting pressure. This will depend entirely on your
requirements and on the specific pump and system. The switch should
also be set to turn the pump off at some required pressure that is higher
than the turn on pressure. To do this, set the required pressures on the
turn on dial (4) and the turn off dial (5). If dry run protection is required,
set the trip point dial to some pressure value that is less than the setting
on the turn on dial, for example to 1 or 2 Bars. Ensure water is available
at the pump and that the pump is primed. Turn on the power. The pump
should start and run for some period up to 30 seconds. The blue timer
light (6) will flash rapidly during this start time. Once the pressure rises
to above the trip point setting the blue light will go out but the pump will
continue to run. If the pressure fails to reach the pressure you have set
on the trip dial (3), the pump will then stop after its 30 second time out.
The red alarm light (8) will flash rapidly to indicate a problem. Press the
master reset button (1) and the process will repeat. Once within your set
operating range the pump will continue to run if there is any demand
for flow, that is, if a tap is turned on. If there is no demand then the
pressure will continue to rise and eventually reach the turn off pressure
(5). If all valves are closed and the pressure fails to reach a level that
causes the pump to switch off, then adjust the turn off pressure dial (5)
down one or two clicks and press the master reset button (1). The pump
should switch off and the red stoplight (8) should come on steady red.
To adjust the whole operation of the pump slightly upward in pressure
turn the fine tune dial (3) clockwise. Each click of the switch increases
the three set pressures, start, stop and trip slightly. If you turn the fine
tune dial anticlockwise the effect is reversed and the pressure range is
shifted progressively lower. The fine tune dial can thus be used to fine
tune the overall performance of the pressure system and to zero it onto
any specific required set point that may fall in between the graduations
on the set point dials.
TESTING FOR LOSS OF PRIME
If the water supply to the pump is turned off, or the pump suction is
vented to atmosphere, the pump’s discharge pressure will fall, and the
pump will start when the pressure reaches the level set on the start dial
(4). If the pressure drops to the level set on the trip point dial (3), the blue
start timer led (6) will come on steady blue and the pump will continue
to run for a fixed time of 30 seconds and try to bring the pressure back
above the level set on the trip point dial (3). If the pressure fails to rise to
above the trip point by the end of the 30 second timeout, the pump will
stop and the red alarm light (8) will flash rapidly. To recover from such
a dry run test, fix the water supply problem, prime the pump and press
the master reset button. The pump should start and the pressure should
climb to within its normal operating range as set on the start and stop
pressure dials.
GETTING THE SETTINGS WRONG
If the pressure setting dials are not correctly set the E20 pressure switch
will not allow the pump to start. The lights (6), (7) and (8) will flash rapidly
and alternately red green and blue, to indicate to you that there is a
problem. Check the dial settings and make sure the turn off pressure (5)
is set higher than the turn on pressure (4) and that the trip point setting
(3) is set to less than the turn on pressure. Once you have corrected the
switch settings, press the master reset for the changes to take effect. The
pump should then start normally.