7
HWE-SS Elite Installation and Operation Manual
• 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 (OD):1.00 (SYS) was initially selected, change the selection to 1.00 (OD):1.25 (SYS).
If the building temperatures are too warm in cold weather, move the ratio to a lower selection. That is, if 1.00 (OD):1.00 (SYS) was
initially selected, change the selection to 1.25 (OD):1.00 (SYS).
• 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 suggested ratios 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)
SET
SET
SET
SET
SET
SET
/<Out. Reset>/Reset Ratio/Custom
• For situations where the provided reset ratios do not provide the perfect building heat-loss
equilibrium, the customized option can be used.
• 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 specific System and Outdoor Temperature to identify it on the diagram.
• To Set the first 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.
• The chart shows an example of a customized curve 6(OD):5(SYS) 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.
Set SYS Temp 1:
100 F
At OD Temp 1:
70 F
Outdoor Temperature (in °F)
70 60 50 40
20
30
0
-10
10
-20
120
140
130
150
160
170
180
100
110
W
ater
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
20
30
0
-10
10
-20
120
140
130
150
160
170
180
100
110
W
ater
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
Offset (Available when Startup Control Mode = Outdoor Reset)
Options:
From -40ºF/-22
º
C to +40ºF/+22
º
C
Default: 0
º
F/0
º
C
SET
SET
SET
SET
SET
SET
/<Out. Reset>/Offset
Offset:
+0 F
• The Offset setting lets you adjust the starting points of the Reset Ratio curves. This means that,
regardless of the Outdoor temperature (OD), or the Reset Ratio that has been selected, when
the Offset setting is changed, that change is directly added to or subtracted from the calculated
temperature/Target. For example, if the Set Point temperature was 130°F and the Offset was
changed from 0° to +10°, then the Set Point temperature would increase to 140°F
• If required:
Adjust the Water Offset in mild weather
. If the ambient building temperatures
are too warm in the mild weather, decrease the Offset. If the ambient building temperatures are
too cold in the mild weather, increase the Offset. The rule of thumb for baseboard radiation is
to change the Offset 4°F for every 1°F you wish to change the building temperatures. In radiant
heat applications, change the Offset 1°F or 2°F for every 1°F you wish to change the building
temperature.
Outdoor Temperature (in °F)
70 60 50 40
20
30
0
-10
10
-20
120
140
130
150
160
170
180
100
110
W
ater
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
20
30
0
-10
10
-20
120
140
130
150
160
170
180
100
110
W
ater
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
Outdoor Cutoff
Options:
Off, 20ºF/-6ºC to 100
º
F/38
º
C, On
Default: 65ºF/18ºF
SET
SET
SET
SET
SET
SET
/Set Point/Cutoff
in Set Point
SET
SET
SET
SET
SET
SET
/Set Point/<Out. Reset>/Cutoff
in Reset
• In Set Point, if the outdoor sensor is installed, the Outdoor Cutoff setting screen will automatically
appear after the temperature Set Point has been selected.
Cutoff:
60 F
• The Outdoor and Cutoff temperatures can be viewed from the default screen by clicking the Up or Down buttons.
• When the outdoor temperature falls to the adjustable Outdoor Cutoff temperature, the HWE-SS will control the System Pump and
Boiler relays to provide heat.
• When the outdoor temperature rises to the Outdoor Cutoff plus a 2°F differential, the HWE-SS will turn the boiler off. The System
relay will remain energized for the Run-On delay then de-energize.
• The Outdoor Cutoff can be set from 20°F to 100°F. In addition, the Setting can be set to ON or OFF. If ON is selected, the System
Relay will run regardless of the Outdoor temperature (OD) and the boiler will be active to hold the calculated water temperature. If
OFF is selected, the System and Boiler relays will always be off.
