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OMM-0153_E
• 5/11/2023 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page 71 of 124
CENTURION Installation, Operation & Maintenance Manual
SECTION 8: WATER HEATER MANAGEMENT
SECTION 8:
WATER HEATER MANAGEMENT
The on-board Water-Heater Management system (WHM) feature is integrated in the Edge
Controller, designed to stage and coordinate multiple
Centurion Water Heaters while
maximizing operational efficiency. The WHM software code resides in each Edge Controller that
is part of the system. The WHM system can control up to sixteen (16) Water Heaters in parallel.
Each Water Heater controlled by the WHM system must be equipped with an actuator-
controlled Sequencing Isolation Valve (P/N
92154C
). This valve is installed on the outlet of each
Water Heater in the WHM network (see Figure 8-1, below).
NOTE:
Some of the descriptions and procedures provided in this section may duplicate
information provided in previous sections of this manual. This is done to organize all WHM
related information into a single section, thus minimizing referencing back to these
descriptions and procedures. It is assumed that the user is familiar with the basic Edge
Controller’s menu processing procedures used throughout this manual.
8.1 General Description
The Edge
Controller’s Water Heater Management system (WHM) is designed to ensure that all
Water Heaters in the system operate at maximum efficiency. This is accomplished by
monitoring the Air/Fuel Valve position (VP) of all Water Heaters that have their Sequencing
Isolation Valves open.
Units with open Sequencing Valves are called enabled units. Units with closed Sequencing
Valves are called disabled units. Units which are unable to function, due to a fault or user
intervention, are called offline units. When there is minimal or no demand for hot water, the
Sequencing Valve for one unit will be open. As system load increases, the WHM will fire up and
open the Sequencing Valves on additional heaters.
A simplified block diagram of multiple Water Heaters connected to a WHM is shown below.
Figure 8-1: Simplified Block Diagram -
Water Heater Management (WHM)