10
Operating Menu Options
To enter the menus, press the Set button
.
Set Point and Reset
Set Point
Options: From -10ºF/-23ºC to 230ºF/110ºC Default: 70ºF/21ºC
/Set Point
(Available when Startup Control Mode = Set Point)
• The Set Point option provides the user with an adjustable xed Target temperature to control the
system. If an Outdoor Sensor was connected, the next menu option will show Outdoor Cutoff,
otherwise there will be no Outdoor Cutoff option.
Set Point:
70 F 140 F
SYSTEM= 148 F
TARGET= 150 F
Outdoor Reset
Options: From 1(8.00º/1.00º) to 12(1.00º/4.00º), Custom Default: 7(1.00º/1.00º)
/<Out. Reset>/Reset Ratio
(Available when Startup Control Mode = Outdoor Reset)
• The Reset Ratio determines how the System water/Secondary Loop temperature will vary with
Outside temperature (O). With any of the ratios, the colder it becomes outside, the hotter the
temperature of the system water. The Ratio is measured as; Outdoor : System Water temperature.
• With a 1.00:4.00 ratio, the System water temperature will increase rapidly as the outside
temperature falls, hitting the maximum water temperature of 240°F at 24°F outdoor temperature.
With a 4.00 (O):1.00 (S) ratio, the System water temperature (S) will increase slowly as the outside
temperature falls.
• The Reset Ratio controls the amount of heat that enters the heating system based on the outdoor
temperature. A higher numbered Reset Ratio will result in a higher Calculated water temperature.
See the Reset Ratio chart on page 2. If the application has radiant heat, a lower numbered Reset
Ratio curve should be selected.
Reset Ratio O/S:
Custom
1(8.00/1.00)
2(4.00/1.00)
3(3.00/1.00)
4(2.00/1.00)
5(1.50/1.00)
6(1.25/1.00)
7(1.00/1.00)
8(1.00/1.25)
9(1.00/1.50)
10(1.00/2.00)
11(1.00/3.00)
12(1.00/4.00)
• If required: Adjust the RESET RATIO in cold weather. If the ambient building temperatures are too cold in cold weather, move
the ratio to a higher selection. That is, if 1.00 (O):1.00 (S) was initially selected, change the selection to 1.00 (O):1.25 (S). If the
building temperatures are too warm in cold weather, move the ratio to a lower selection. That is, if 1.00 (O):1.00 (S) was initially
selected, change the selection to 1.25 (O):1.00 (S).
• The Custom option gives the user the capability of creating a specialized Reset Ratio curve. Setting two points on the Reset Ratio
chart generates the customized curve. Each point requires a System Water Temperature and an Outdoor Temperature. The line
connecting the two points will be the customized reset ratio.
• Reset Ratios are adjustable based on the building and application. See Types of Radiation in Buildings on page 2.
Custom Outdoor Reset Curve
Options: Sys Temp 1, 2 (-10ºF/21ºC) to (210ºF/99ºC) Default: 1(100ºF/38ºC), 2(171ºF/77ºC)
Options: Outdoor Temp 1, 2 (-10ºF/-23ºC) to (100ºF/38ºC) Default: 1(70ºF/21ºC), 2(0ºF/-18ºC)
/<Out. Reset>/Reset Ratio/Custom
(Available when Startup Control Mode = Outdoor Reset)
• For situations where the provided reset ratios do not provide the perfect building heat-loss
equilibrium, the customized option can be used.
Set SYS Temp 1:
100 F
At OD Temp 1:
70 F
• The Custom Reset Ratio is only available when Custom is selected from the Reset Ratio menu
option. It provides the user with the capability of assigning two points on the reset ratio diagram
and use the line that connects those two points as the customized reset ratio curve. Each of the two
points will need a specic System and Outdoor Temperature to identify it on the diagram.
• To Set the rst point, specify Sys Temp 1, and OD Temp 1. Then, specify Sys Temp 2, and OD
Temp 2, to set the second point on the curve. The two points can be any where on the line, not
necessarily at the ends. As well, the slope can be in any direction.
• The chart shows an example of a customized curve 6(O):5(S) that do not exist in the standard curve
options. If the outdoor temperature reaches 30ºF, the system target will be 145ºF.
• Remember that the Min Target and Max Target apply to all reset ratios including the customized
reset ratio ones.
Outdoor Temperature (in °F)
70 60 50 40 2030 0 -1010 -20
120
140
130
150
160
170
180
100
110
Water Temperature (in °F)
Custom Reset Ratio
Point1: System=120°F
Oudoor=60°F
Point2: System=170°F
Oudoor=0°F
Point1
Point2
Customized Reset Ratio
Max Target
Min Target
Outdoor Temperature (in °F)
70 60 50 40 2030 0 -1010 -20
120
140
130
150
160
170
180
100
110
Water Temperature (in °F)
Target Offset
Offset=10°F
Reset Ratio=1.5 : 1.0
Reset Ratio
Max Target
Min Target
Reset Ratio + 10F Offset
Min Target=120°F
Max Target=170°F
