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Innovation Water Heaters Installation, Operation & Maintenance Manual
CHAPTER 8 – WATER HEATER MANAGEMENT
OMM-0078_0M
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
Page
123
of
216
GF-128
Phone: 800-526-0288
09/11/2015
NOTE
The WHM Nxt On VP and WHM Nxt Off VP will determine how tight a range the
temperature is controlled over and how quickly the system responds to a change in load.
A narrow difference between Nxt On VP and WHM Nxt Off VP will make the system more
responsive to load changes.
8.8 WHM HARDWARE INSTALLATION & SET-UP INSTRUCTIONS
The following sections provide the basic installation and set-up instructions for implementing a
Water Heater Management System (WHM) to control up to eight (8) AERCO Innovation Water
Heaters. Some of the descriptions and procedures included in Chapter 2 are repeated here to
avoid unnecessary referencing.
8.8.1 Installation Notes
If you are installing a WHM system that also includes a ProtoNode SSD (Slave-Slave Device),
you
must
adhere to the procedure listed below. Failure to complete these steps can result in the
failure of the WHM system.
a)
Do
NOT
install the ProtoNode Device at the outset of the installation. If the ProtoNode
Device is already installed, you must physically disconnect it from the Modbus network in
I/O board.
b)
Make sure that the Modbus load and bias resistors are properly configured for the system
to operate without the ProtoNode installed.
c)
Temporarily set the WHM system for Constant Setpoint mode of operation (see below).
d)
Turn on and completely test the installation to verify that it is operating proper.
e)
Once the installation is working properly as a WHM system, install the ProtoNode Device.
f)
Make sure that the Modbus load and bias resistors are properly configured for the system
to operate with the ProtoNode installed.
g)
Set the WHM system for desired mode of operation (Setpoint mode).
h)
Test the system completely with the ProtoNode installed.
8.8.2 Hardware Installation
All Innovation Water Heaters which will be controlled by a WHM master must be equipped with
an actuator-controlled sequencing valve (P/N
92123
). If this valve is not already installed on the
cold water inlet, proceed as follows:
WHM Hardware Installation
1.
Remove the sequencing valve from its stowed location.
2.
Refer to Figure 8-2 and attach the valve to the cold water inlet of the unit (shown in Figure
8-2, below) using the pipe union and nipple provided.
3.
Ensure that the valve is positioned with the actuator enclosure position as shown in Figure
8-2.
4.
AERCO recommends that another pipe nipple and union be attached to the valve inlet
prior to connecting the cold water supply piping.