Start Sequence - Watts Aerco BENCHMARK 750 User Manual

Benchmark 750 – 1000 Boiler User Manual - INTERNATIONAL

3.10 START SEQUENCE

When the Control Box ON/OFF switch is set to the ON position, it checks all pre-purge safety
switches to ensure they are closed. These switches include:
•
Safety Shut-Off Valve (SSOV) Proof of Closure (POC) switch
•
Low Water Level switch
•
High Water Temperature switch
•
High Gas Pressure switch
•
Low Gas Pressure switch
The Blocked Inlet and downstream Blower Proof switches are not
checked prior to starting the pre-purge.
If all of the above switches are closed, the READY light above the ON/OFF switch will light and
the unit will be in the STANDBY mode.
When there is a demand for heat, the following events will occur:
If any of the Pre-Purge safety device switches are open, the
appropriate fault message will be displayed. Also, the appropriate
messages will be displayed throughout the start sequence, if the
required conditions are not observed.
OMM-0119_0A
GF-130-I
CHAPTER 3 – OPERATION
NOTE
NOTE
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
Ph.: 800-526-0288
Page 49 of 170
11/03/2016