Innovation Hot Water Hot Water Boiler User Manual
- INTERNATIONAL
CHAPTER 8 – WATER HEATER MANAGEMENT
OMM-0120_0A
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
Page
117
of
174
GF-128-I
Phone: 800-526-0288
11/15/2016
WHM MENU
See section 8-6 for a range of choices and the default values.
ITEM
MENU LEVEL &
OPTION
DESCRIPTION
41
1 WHM Units 8
This menu item shows the current status for each unit controlled by
WHM (8 max.). The characters displayed are defined as:
- = Off Line, * = Not available (fault, etc.), 0 = Off, 1 = On,
A = Lead On, a = Lead Off, B = Lag On, b = Lag Off
The following example shows the status of 5 units being controlled by
WHM:
1 WHM Units 8
_ 1_ _0_ _1_ _*_ _A_ _b_ ___ ___
Where: Unit 1 & 3 = On, Unit 2 = Off, Unit 4 = Not available,
Unit 5 = Lead On, Unit 6 = Lag Off
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 Hot
Water Boilers. Some of the descriptions and procedures included in Chapter 2 are repeated
here to avoid unnecessary referencing.
8.8.1 Installation Notes
AERCO requires a WHM sequencing valve in multi-unit tankless configurations. When WHM is
employed, Modbus communication with BAS requires a ProtoNode SSD (Slave-Slave Device).
If you are installing a WHM system that also includes a ProtoNode SSD, 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.
