AERCO C-More Controls Manual June 2010 - Manual (Page 96)

C-More Controller for Benchmark, Innovation & KC
USER MANUAL
Page 96 of 162 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, New York 10913 04/22/14
GF-112 Phone: 800-526-0288 OMM-0032_0E
8.6 WHM MENU SETTINGS
The required settings for WHM Menu items listed in Table 8-1 will vary depending on the
number of units connected to the Modbus network and required setpoint and operating
conditions to be maintained on the network. Set the menu options in accordance with the
descriptions provided in the paragraphs 8.6.1 through 8.6.10 which follow.
NOTE
It is recommended that the WHM Menu settings described in the
following paragraphs be performed first at the WHM Master. This
will simplify the number of required entries since most of the
settings will be “pushed” to the appropriate Slaves.
8.6.1 WHM Mode
Set the WHM Mode option to WHM Master for the controlling Master. Set the WHM Mode option
to WHM Slave for all other units on the Modbus network.
8.6.2 Comm Address (Located in Setup Menu)
This option, located in the Setup Menu, is the Modbus address for the for the water heater on
the network. To simplify addressing, assign consecutive address numbers 1 through 8.
8.6.3 WHM Setpoint
The default setpoint for the WHM is 130°F. If a different setting is desired, the setpoint can be
varied from 40°F to 240°F.
8.6.4 WHM Nxt On VP
This is the Next On Air/Fuel Valve Position (VP), % open) for the system. The default value for
this option is 75%. When all enabled water heaters have a valve position (VP) greater than this
value, the WHM Master will enable another water heater, if one is available. If a different value
is desired for the system, this menu option can be varied from 16% to 100%. The selected value
must always be greater than the Next Off Valve Position, and there should be a reasonable
spread between the two values.
8.6.5 WHM Nxt Off VP
This is the Next Off Air/Fuel Valve Position (VP), % open) for the system. The default value for
this option is 35%. When all enabled water heaters have a valve position (VP) less than this
value the WHM will disable one of the enabled water heaters. The exception to this rule is if
there is only one water heater currently enabled.
8.6.6 Lead/Lag Hours
This feature is designed to spread the total number of run hours accumulated on all units in the
system so that each of the units have approximately the same number of run hours. The default
value for this option is 72 hours.
8.6.7 Setback Setpoint
This menu item specifies the setpoint temperature that the WHM system will maintain during
time periods of low DHW demand.
8.6.8 Setback Start & Setback End
These two menu items specify the start and end times that the Setback Setpoint will be in effect.
The start and end times can be set from 12:00am (midnight) to 11:59pm. To disable the setback
feature, leave the start and end times set to 12:00am (midnight).