Low Water Cutoff (Lwco) - Capacitor Electrical Short Test - Watts Aerco Benchmark OMM-0117 Operation And Maintenance Manual

Benchmark 5000-6000 Operation & Maintenance Manual
SECTION 4 – MAINTENANCE

4.11.1 Low Water Cutoff (LWCO) - Capacitor Electrical Short Test

This test determines if there is an electrical short between the LWCO capacitor and the heat
exchanger. Perform the capacitor electrical short test as described below.
Low Water Cutoff – Capacitor Electrical Short Test Instructions
1. Turn the AC power to the unit to OFF.
WARNING!
High voltages are used to power these units and so it is required that power applied to
these units is removed first before performing the procedure described in this instruction.
Serious personal injury or death may occur if this warning is not observed.
2. Remove the Shell Harness Cable (male) connector from the P-5 (female) connector on
the rear panel of the C-More Controller (see Figure 4-13).
Figure 4-13: Removing Shell Harness Cable from C-More's Rear Panel
3. Using an ohmmeter, connect one ohmmeter probe to the LWCO capacitor terminal on
the unit shell as shown on left in Figure 4-14.
4. Connect the second ohmmeter probe to Pin #6 of Shell Harness Connector (removed
from the C-More Controller) as shown on right in Figure 4-14.
CONNECT 1
TO LWCO TERMINAL
LWCO Probe Assembly Connector
Figure 4-14: Connecting Ohmmeter between LWCO Probe & Shell Harness Cable
OMM-0118_B • GF-203 • 5/9/2019
UNPLUG SHELL HARNESS CABLE
FROM C-MORE'S P5 CONNECTOR
ST
LEAD
Ohmmeter
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
ND
CONNECT 2 LEAD
TO PIN #6
19-Pin Shell Harness Cable Connector
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