User Manual

RECON Water Heaters Installation, Operation & Maintenance Manual
CHAPTER 8 – WATER HEATER MANAGEMENT
Page 122 of 178 AERCO International, Inc.  100 Oritani Dr.  Blauvelt, NY 10913 OMM-0103_0A
PRI: 10/28/2014 Phone: [phone] GF-147
Table 8-2: Water Heater Management Menu Item Descriptions
WHM MENU
See section 8-6 for a range of choices and the default values.
ITEM
MENU LEVEL &
OPTION
DESCRIPTION
1 WHM Mode
This option is used to enable/disable the WHM Mode and set the unit to
function as a WHM Slave or WHM Master. Set the WHM Mode option to
WHM Master for the controlling Master and to WHM Slave for all other units
on the Modbus network.
2 WHM Setpoint
This is the temperature (°F) that each unit in the WHM system is trying to
control to.
3
WHM Nxt On VP
(See NOTE below)
This is the Next On A/F Valve position (%) for the system. When all enabled
water heaters have a fire rate greater than this value, it is time to enable
another water heater, if one is available. This value should always be greater
than the Next Off A/F Valve, and there should be a reasonable spread
between the 2 values.
4
WHM Nxt Off VP
(See NOTE below)
This is the Next Off A/F Valve position (%) for the system. When all enabled
water heaters have a A/F Valve position less than this value, it is time to shut
down another water heater, if one is available. This value should always be
less than the Next On A/F Valve position, and there should be a reasonable
spread between the 2 values.
5 Lead/Lag Hours
The Lead/Lag Hours menu option is designed to spread the total
number of run hours accumulated on all units in the system so that
each unit has approximately the same number of run hours.
6 WHM Upld Timer
Sets the time between successive WHM Heartbeat OnAER data
transmissions.
7 Setpoint Setback
Enables/Disables the Setpoint Setback feature which allows for the
substitution of an alternate Setpoint setting during certain time periods
of the day. The alternate Setpoint is entered into the “Setback
Setpoint” item and the time is entered in the “Setback Start” and
“Setback End” items.
8 Setback Setpoint
This menu item specifies the setpoint temperature (°F) that the WHM
system will maintain during time periods of low DHW demand.
9 & 10
Setback Start:
Setback End:
These two menu items specify the start and end times that the
Setback Setpoint will be in effect. (12:00am – 11:59pm)
11 WHM Auto Mstr
Password Level 2 (6817) must be entered in order to access the
WHM Auto Mstr menu option. This item Enables (Yes) or Disables
(No) an Automatic WHM Master Switch-Over function. When enabled
(Yes) the WHM will automatically select a new Master if the current
Master fails or loses power. This option is used with the WHM Auto
Timer option, described in the following section.
12 WHM Auto Timer
Password Level 2 (6817) must be entered in order to access the
WHM Auto Timer menu option. When the WHM Auto Mstr option is
set to Yes (Enabled), the WHM Auto Timer option allows the user to
select the elapsed time interval between failure of the WHM Master
and switch-over to a new WHM Master.
13 WHM Min Addr
Set the minimum address of the heaters to be controlled by the master. The
WHM Min Addr and WHM Max Addr must differ by no more than 7.