Beckett 2N1R LWCO 7600P Series User manual

Instructions for Replacing Beckett 2N1R LWCO Sensor
Part No. 62075-001
PARTS LIST:
(1) 7600Pxx LWCO Sensor
(1) 1K ohm resistor - used for testing sensor
INSTRUCTIONS:
1. Remove power from the AquaSmart control.
2. Unplug the existing sensor from the connection
under the display and remove the sensor from
the well. If the sensor is mounted remotely from
the control, remove the well clip used for holding
the sensor cable in place and save for use when
installing the new sensor.
3. Disconnect the green sensor wire from the bullet/
connector, pipe clamp or from the green screw on
the AquaSmart control.
4. Before inserting the new sensor, use an ohm meter
to check the continuity of the LWCO circuit. Attach
one of the meter probes to the connector, screw or
wire to which the green sensor lead was attached. The
second probe should go to metal on the boiler vessel
(not the boiler jacket).
5. A good connection reading 5 ohms or less should be
possible. Check all connections in the LWCO wiring
circuit for possible issues. If the reading is above 10
ohms, run a new ground wire from the green screw
on the control case to the boiler vessel. If a new wire
is used, connect the green lead on the new sensor to
the green screw when the new sensor is installed. The
LWCO function will not operate properly without a
good connection from the green sensor lead back
to the boiler vessel.
6. Insert the replacement sensor into the well. Make
sure the sensor is fully seated. You should feel a
slight resistance when the sensor pin reaches the
clip in the well. Continue pushing until the sensor
comes to a solid stop. If the sensor is remotely
mounted, reinstall the clip used to hold the sensor
cable securely in place.
No Pin
Engagement
Full Pin
Engagement
7. Plug the main sensor cable into the connector under
the display.
8. Reconnect the green sensor lead to the bullet/
connector, pipe clamp or to the green screw on the
AquaSmart control.
9. Restore power to the AquaSmart Control. Allow the
control to go through the start-up process. Follow the
Control Checkout Procedure in the AquaSmart manual
to conrm proper operation of the control. Proper
operation of the control must be conrmed before
leaving the installation site.
STANDBY
WTR: 120F
Normal Display in Standby

What to do if Low Water Lockout
Occurs with New Sensor
1. Turn off power to the control.
2. Remove sensor from well and disconnect green
sensor wire. Leave the main sensor cable
connected to the control.
3. Being careful not to allow the sensor or the green
wire to touch anywhere in the terminal area of the
control, restore power to the control. Within 30
seconds the AquaSmart control should enter into
Lockout Water Low.
LOCKOUT
WATER LOW
4. Use the 1,000 Ohm resistor attached to this
instruction sheet. Place one resistor lead on the
metal pin of the sensor, the second resistor lead
should be on a metal portion of the connector for
the green wire coming from the sensor (see pictures
below). Hold the resistor in place with ngers.
Within 30 seconds the Lockout Low Water fault on
the display should clear. If the Lockout Low Water
clears, the sensor is operating properly.
Other Possible Causes:
• Poor connections in the LWCO circuit wiring
• Deposit build up on the well or boiler vessel
• Conductivity issues with the water.
5. Recheck the continuity of the LWCO circuit following
the procedure on the previous page.
6. If the sensor is good and the LWCO connection
wiring is good, drain water from the boiler, remove
the well and check for deposit build up on the well.
Clean if necessary and reinstall the well. Rell the
boiler. Check for proper operation of the LWCO
circuit.
7. If the sensor, LWCO connection wiring and well are
good, attempting to measure the resistance through
the water may provide some indication of the
conductivity of the water in the system. Remove the
sensor from the well. Place one of the ohm meter
probes on the metal tube inside the well and place
the second probe on the metal of the boiler vessel.
• 100K ohms or above - water not in contact with
well, deposit build up in boiler vessel
• 5K-100K ohms - intermittent operation could
occur
• 5K ohms or below - LWCO should operate
These are rough guidelines only.
Normal Display Heating Water
HEATING WTR
WTR: 120F
R.W. BECKETT CORPORATION
P.O. Box 1289, Elyria, Ohio 44036
R.W. BECKETT CANADA, LTD
430 Laird, Unit 3, Guelph, Ontario, N1G 3X7
Part No. 62075-001 R00, Printed in the USA 10/15
1K Ohm
Resistor
Here