Section 3. Start Sequence; Introduction; Start Sequence - Watts AERCO Benchmark BMK750 Operation And Service Manual

Benchmark with Edge [I]: Operation-Maintenance Manual
SECTION 3 - START SEQUENCE

SECTION 3. START SEQUENCE

3.1 INTRODUCTION

The information in this section provides a guide to starting the Benchmark Boiler using the Edge
[i] Controller. It is imperative that the initial startup of this unit be performed by factory trained
personnel. Operation prior to initial startup by factory trained personnel may void the equipment
warranty. In addition, the following WARNINGS and CAUTIONS must be observed at all times.
WARNING!
•
All of the installation procedures in Section 2: Installation in the Benchmark 750-6000 with
Edge [i]: Install-Startup Manual (OMM-0144, GF-217) must be completed before the initial
start-up of the unit.
•
Electrical voltages up to 120 VAC (BMK750 – 2000), 208 or 480 VAC (BMK2500 - 4000),
or 208, 480 or 575 VAC (BMK5000 & 6000) and 24 volts AC may be used in this
equipment. It must be serviced only by factory certified service technicians.
•
Do not attempt to dry fire the unit. Starting the unit without a full water level can seriously
damage the unit and may result in injury to personnel or property damage. This situation
will void any warranty.
•
Initial startup of the unit must be performed by AERCO factory trained personnel.
Operation prior to initial startup by factory trained personnel may void the equipment
warranty. In addition, the following WARNINGS and CAUTIONS must be observed at all
times.

3.2 START SEQUENCE

When the Edge [i] Controller Enable/Disable switch is set to the Enable position, it checks all pre-
purge safety switches to ensure they are closed. These switches include:
•
High Water Temperature switch
•
High Gas Pressure switch
•
Low Gas Pressure switch
•
Low Water Level switch
•
Safety Shut-Off Valve (SSOV) Proof of Closure (POC) switch
NOTE:
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 Enable/Disable switch) will
light when the switch is in the Enable position and the unit will be in the STANDBY mode.
NOTE:
If any of the Pre-Purge safety device switches are open, or the required conditions are not
observed throughout the start sequence, appropriate fault messages will be displayed.
When there is a demand for heat, the following events occur:
OMM-0145_A99 • GF-218 • Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
9/18/2019 Page 31 of 157