Beckett 7600 AquaSmart Boiler Control - Manual (Page 10)

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Figure 7 - Pin Engagement Cutaway
e - No pin engagement
f - As the probe is inserted, it comes in contact with the clip opening
and there is some slight resistance (tactile feedback). Continue
pushing probe which forces pin to slide further into the clip.
g - Complete engagement. Pin will “bottom-out” into the end of the
thermowell.
e f g
Test the Low Water Cut-off (LWCO)
Safety Function
WARNING! Electric Shock Hazard. Avoid touching
or shorting the live terminals during this test.
Integrated Unit Version:
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.
Replaceable Version:
1. Turn electric power ON to energize AquaSmart
control. Perform the following tests to verify the
LWCO function.
2. Pull the sensor probe partially out of the sensor
thermowell to disengage the pin from the clip inside
the tube (see Figure 7). you should feel it when the
pin disengages. The sensor should cause the
AquaSmart display to indicate, “LOCKOUT - LOW
WATER” after the LWCO Off Delay times out.. If it
does not, replace the sensor.
3. Once testing is completed, fully insert the sensor probe
into the thermowell so that the pin in fully engaged in
the clip.
Figure 8 - Sensor Water Detection Method
Ground Screw
2-IN-1 SENSOR
AquaSmart
Boiler Control
Ground Wire
Pipe Clamp
Incomplete
Circuit
Water Not Present
Water Inlet
Water Present
Complete
Circuit
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.