AERCO RECON 1000 - Manual (Page 115)

RECON Water Heaters Installation, Operation & Maintenance Manual
CHAPTER 8 – WATER HEATER MANAGEMENT
OMM-0103_0A AERCO International, Inc.  100 Oritani Dr.  Blauvelt, NY 10913 Page 115 of 178
GF-147 Phone: 800-526-0288 PRI: 10/28/2014
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 being done to minimize referencing back to these
descriptions and procedures and organize all WHM related
information into a single Chapter. It is assumed that the user is
familiar with the basic C-More Menu processing procedures used
throughout this manual.
The On-Board-Water-Heater Management system II (WHM II) is an integrated C-MORE feature
designed to stage and coordinate multiple AERCO RECON water heaters while maximizing
operational efficiency. The WHM software code resides in each C-More 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
92093. These valves are installed in the following locations on each water heater being
controlled by the WHM, depending (see Figures 2-4 and 8-1):
 Building recirculation is used – installed on the hot water (building supply) outlet
 Building recirculation is NOT used – installed on the cold water inlet
8.1 GENERAL DESCRIPTION
The C-More 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)