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Benchmark 3.0LN 24-Month Maintenance Kit 58015-04
Technical Instruction Document
TID-0135_0C
10
/12/2017
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, New York 10913
•
Phone: 800-526-0288
Page 16 of 20
6.2
Replacing the LWCO Probe/Capacitor Assembly
The replacement LWCO probe sensor comes with a capacitor assembly attached. This
procedure replaces an old probe assembly with a new probe assembly (P/N
69126
).
1. Cut the shell harness wire just below the female spade connector (Figure 12). The new
LWCO assembly includes a new female connector to crimp onto the shell harness wire.
Figure 12: Removing Old LWCO Probe/Capacitor Assembly
2. Remove the LWCO probe from the recess well on the hot water outlet piping by
unscrewing the brass coupling to which it is attached.
3. Retrieve the new LWCO probe from the kit and sparingly apply an NSF approved pipe
dope to the threads of the brass coupling (Do NOT use Teflon tape) and install into the
probe well vacated by the old LWCO probe.
4. The new LWCO assembly comes with a spare female connector already inserted into the
male connector, and this should be crimped onto the stripped end of the shell harness
wire.
6.3
Low Water Cutoff (LWCO) Capacitor Integrity Test
The LWCO capacitor should be tested for electrical shorts after it has been replaced. The
LWCO capacitor integrity test consists of two parts as described in the next two sections.
The first procedure explains how to test for electrical shorting of the LWCO probe capacitor,
while the second procedure instructs how to perform the standard Low Water Cutoff test
using the C-More controls.
Refer to Figure 13 for an illustration of the LWCO probe assembly and its typical installation.
MALE SPADE
CONNECTOR
FEMALE SPADE
CONN.ON THE
SHELL HARNESS WIRE
OLD LWCO PROBE
CUT OFF WIRE
TO OLD LWCO
ASSEMBLY
HERE
OLD CAPACITOR
(COVERED BY LARGE
SHRINK TUBING)
PROBE WELL OF
HOT WATER
OUTLET PIPING
LWCO PROBE
& CAPACITOR
ASSEMBLY