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SECTION 3 START SEQUENCE
SECTION 3. START SEQUENCE
3.1 Introduction
The information in this section provides a guide to starting the CFR Boiler using the Edge 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.
Electrical voltages up to 480 VAC 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 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 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:
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:
1. The Controller's red DEMAND LED status indicator will light.
2. The unit checks all five pre-purge safety switches listed at the beginning of this section. The Edge
Controller's ignition sequence screen walks you through the ignition screens and demonstrates (or
highlights) which switches are not met. SSOV locations are shown in Figure 3-1.
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High Water Temperature switch
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High Gas Pressure switch
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Low Gas Pressure switch
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Low Water Level switch
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Safety Shut-Off Valve (SSOV) Proof of Closure (POC) switch
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