heat-timer DIGI-SPAN VSP Elite Installation And Operation Instructions Manual page 11

11
Offset
Options: From -40ºF/-22ºC to +40ºF/+22ºC
/<Out. Reset>/Offset
SET
(Available when Startup Control Mode = Outdoor Reset)
• The Offset setting lets you adjust the starting points of the Reset Ratio curves. This means
that, regardless of the Outdoor temperature (O), 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 Cutoff
Options: Off, 20ºF/0ºC to 100ºF/25ºC, On
/Set Point/Cutoff
SET
/Set Point/<Out. Reset>/Cutoff
SET
• In Set Point, if the outdoor sensor is installed (see Outdoor Sensor Installation on page 3), the
Outdoor Cutoff setting screen will automatically appear after the temperature Set Point has been
selected and saved.
• The outdoor and its 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 VSP Elite will control the System Pump relay
and the injection pump output to provide heat.
• When the outdoor temperature rises to the Outdoor Cutoff plus a 2°F differential, the VSP Elite will stop the injection pump.
However, will allow the System relay to remain energized for the Pump Run-On delay then de-energize it.
• 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 energize regardless of the Outdoor temperature and the VSP Elite will control the injection pump to hold the target
temperature. If OFF is selected, the System relay and injection pump output will always be off.
Minimum Target
Options: From 70ºF/21ºC to 180ºF/77ºC
/Set Point/<Out. Reset>/Min. Tgt
SET
(Available when Startup Control Mode = Outdoor Reset)
• The Minimum Target Temperature must be set to the system design specification. The VSP Elite will calculate the Target based on
the Outdoor temperature (O), the Reset Ratio, and the Offset value. The VSP Elite will control the injection pump to hold either the
calculated temperature or the Minimum Target Temperature whichever is higher.
• The Minimum Target Temperature must be at least 20°F lower than the Maximum Temperature (See next setting).
Maximum Target
Options: From 90ºF/38ºC to 240ºF/116ºC
/Set Point/<Out. Reset>/Max. Tgt
SET
(Available when Startup Control Mode = Outdoor Reset)
• This is the highest temperature heating water the VSP Elite will circulate through the heating system.
• When using a radiation system, it should be set according to the tubing or floor manufacturer's specification.
• The Maximum Temperature must be at least 20°F higher than the Minimum Temperature.
VSP Digi-Elite Installation & Operation Manual
Default: 0ºF/0ºC
Default: 65ºF
in Set Point
in Reset
Default: 70ºF/27ºC
Default: 240ºF/116ºC
Offset:
+0 F
Offset=10°F Min Target=120°F
Reset Ratio=1.5 : 1.0 Max Target=170°F
180
170
Max Target
160
150
140
130
120 Min Target
110
100
70 60 50 40 30 20 10 0 -10
Outdoor Temperature (in °F)
Target Offset
Cutoff:
60 F
Point1: System=120°F Point2: System=170°F
Oudoor=60°F Oudoor=0°F
Max Target
180
170 Point2
160
150
140
130
Point1 Min Target
120
110
100
70 60 50 40 30 20 10 0 -10
Outdoor Temperature (in °F)
Custom Reset Ratio
Min Target:
120 F
Max Target:
200 F
-20
-20