Innovation - Edge [i] Installation, Operation, Maintenance Manual
CHAPTER 8
– WATER HEATER MANAGEMENT
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9/6/2019
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CHAPTER 8.
WATER HEATER MANAGEMENT
NOTE:
Some of the descriptions and procedures provided in this Chapter may duplicate information
provided in previous Chapters of this manual. This is done to organize all WHM related
information into a single Chapter, 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.
The On-Board-Water-Heater Management system II (WHM II) is a feature integrated in the
Edge Controller, designed to stage and coordinate multiple AERCO Innovation water heaters
while maximizing operational efficiency. The WHM software code resides in each Edge
Controller that is part of the system. The WHMII can control up to eight (8) water heaters in
parallel. Each water heater controlled by the WHM must be equipped with an Actuator-
Controlled Sequencing Valve (P/N
92123
). These valves are installed on the cold-water inlet on
each water heater in the WHM network (see Figure 8.1).
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 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 open the
sequencing valves on additional heaters. A simplified block diagram of multiple water heaters
connected to a WHM is shown in Figure 8.1.
Figure 8.1: Simplified Block Diagram - Water Heater Management (WHM)