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059705–00 REV. B
18
SETTINGS—BASIC HEAT MENU
HEAT ADJUSTMENT—
HOT WATER
Selections:
1–12
Default:
5
Description:
The Heat Adjustment or Reset Ratio determines how the System water
temperature (SYS) will vary with Outside temperature (OD). With any of the ratios, the
colder it becomes outside, the hotter the temperature of the system water. The ratios
are adjustable from 4.00 (OD):1.00 (SYS) to 1:00 (OD):8.00 (SYS).
.
With a 1.00 (OD):4.00 (SYS) ratio, the System water temperature (SYS) will increase
rapidly as the outside temperature falls, hitting the maximum of 240°F at 24°F outside
temperature. With a 4.00 (OD):1.00 (SYS) ratio, the System water temperature (SYS) will
increase slowly as the outside temperature falls. Even at –30°F, the system water will
only be 125°F, and at 24°F outside, the system water will be 112°F. Such a low Reset
Ratio might be used with radiant floor heating applications.
With most baseboard heating applications, a 1.00 (OD):1.00 (SYS) setting is a
good place to start. With a 1.00 (OD):1.00 (SYS) ratio, for every degree the outside
temperature falls, the system water temperature is increased one degree.
The Heat Adjustment setting is only a starting point as the Genesis Heat-Timer
®
will
automatically adjust the Reset Ratio based on the feedback of the building space
sensors. If the average space temperature exceeds the building target temperature,
the Genesis Heat-Timer
®
control will shutdown the boiler or in a 3-way mixing valve
application, close the valve. This will continue until the average space temperature
falls below the building target temperature. The Genesis Heat-Timer
®
control will then
adjust the reset ratio accordingly so that the adjusted system temperature is lower.
If the average space temperature is below the building target temperature, the
Genesis Heat-Timer
®
program will recognize this and automatically adjust the
outdoor reset ratio to increase the system water temperature. This self learning logic
of Genesis Heat-Timer
®
allows the installer to select a random ratio setting and allow
the program logic to adjust accordingly without worrying about the tenant comfortable
level being compromised.
HEAT ADJUSTMENT
BACK SAVE
1 4 °OD = 1 °Sys
2 3 °OD = 1 °Sys
3 2 °OD = 1 °Sys
4 1 . 5 °OD = 1 °Sys
5 1 . 25 °OD = 1 °Sys
6 1 °OD = 1 °Sys
7 1 °OD = 1 . 25 °Sys
8 1 °OD = 1 . 5 °Sys
9 1 °OD = 2 °Sys
10 1 °OD = 3 °Sys
1 1 1 °OD = 4 °Sys
12 1 °OD = 8 °Sys