Benchmark 1500 - 2000 Boilers
CHAPTER 2 – INSTALLATION
Page 34 of 182 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0097_0E
10/01/2015 Ph.: 800-526-0288 GF-142
Installing Sequencing Isolation Valve – Continued
2. The boiler’s shell harness has one unused cable. One end of this cable is connected to
the DELAYED INTERLOCK IN terminals in the I/O board (see Figure 2-14) while the other
end contains a Molex connector with a jumper wire inserted in it (this jumper wire allows
units that do not have a sequencing isolation valve to operate normally). Find the free end
of this cable inside the unit’s enclosure.
Figure 2-14: Sequencing Isolation Valve Installed
3. Remove the jumper wire from the Molex connector and then plug it into the sequencing
isolation valve’s connector.
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