Beckett AquaSmart 2N1 sensor - Manual (Page 2)

Part No. 61798 R00, Printed in the USA
10/10
Test the Low Water Cut-off (LWCO) Safety Function
WARNING! Avoid touching or shorting the live
terminals during this test.
Turn electric power ON to energize AquaSmart control.
Perform the following tests to verify the LWCO function.
For AquaSmart 7600A: Remove the green sensor
lead from the ground screw. The sensor should cause
the AquaSmart display to indicate, “LOCKOUT – LOW
WATER”. If it does not, replace the sensor.
For AquaSmart 7600B: Remove the green sensor lead
from the ground screw and remove both the B1 and B2 (24
Vac) leads from their terminals. The sensor should cause
the AquaSmart display to indicate, “LOCKOUT – LOW
WATER”. If it does not, replace the sensor.
Attach wires and tighten terminal screws securely when
testing is complete.
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•
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INSTRUCTIONS:
Installing the 2-in-1 Sensor
This is very important for successful control operation.
Remove the existing immersion well. Clean the threads in the
boiler port tapping. Follow all applicable safety codes, rules
and guidelines for removing/installing immersion wells.
Apply pipe sealant to the 2-in-1 sensor threads and install
it securely into the port. BECKETT RECOMMENDS ONLY
TO USE TEFLON TAPE OR RECTROSEAL NO. 5 PIPE
SEALANT.
Tighten with 1-1/8” open end or box wrench. Pipe
wrenches, pliers, and adjustable wrenches will damage/
round-off the hex.
Securely install the AquaSmart control to the sensor. Plug
the 2-in-1 Sensor RJ connector (phone jack style) into the
receptacle (Item a, Figure 1) on the control.
Route the 36” green wire through the AquaSmart bottom
rectangular slot (Item c, Figure 1). Securely install the
fork connector of the 36” ground wire and the ground
wire from the 2-in-1 sensor under the ground screw at the
bottom of the control (Item b, Figure 1).
Thoroughly clean the pipe surface and securely tighten
the pipe clamp on the water inlet pipe to the boiler as close
to the boiler as possible.
Route the 36” green ground wire to the pipe clamp then
cut to proper length, if necessary.
1.
2.
3.
4.
5.
6.
7.
Figure 3 - Ground Clamp and Grounding Wire
Figure 1 - Sensor lead connection & ground screw connections Figure 2 - Sensor Water Detection Method
Ground Screw
2-IN-1 SENSOR
AquaSmart
Boiler Control
Ground Wire
Pipe Clamp
Incomplete
Circuit
Water Not Present Water Present
Complete
Circuit
Water Inlet
The AquaSmart 2-in-1 Sensor uses the “conduction” method to
detect whether water is present in the boiler. This is done by using
the water in the boiler itself to “conduct” a signal and complete
an electrical circuit. It is necessary that the ground wire from the
sensor be bonded to the boiler wall (not the jacket - unless the
jacket is bonded to the boiler wall). When water is not present,
there is no “conduction” and the circuit is incomplete.
For the AquaSmart we recommend that a grounding pipe clamp be
mounted to the water inlet pipe, and that a ground wire be bonded
from the pipe clamp to the green terminal inside the AquaSmart
control. The 2-in-1 sensor green “ground wire” shall also be
bonded to the green terminal in the AquaSmart control.
a
b
c
d
Strip the wire and insert the stripped end into hole on the
pipe clamp (item d, Figure 3). Tighten retaining screw
against the wire making sure that you have good contact.
Complete control wiring and fi ll the appliance with
water to the pressure required, according to appliance
manufacturer’s instructions. Make sure all air is purged
from the system and there are no leaks. Turn on power
to the appliance and observe one call for heat cycle with
shut off at set temperature.
8.
9.