The DIGI-SPAN VSP
Elite
establishes ambient
comfort by varying the temperature of the Secondary
Loop’s circulating hot water in response to changes
in the loop temperature. The temperature of the
heating water is controlled by regulating the speed
of a pump which injects water from a hot Boiler
Loop (Primary Loop) into a cooler heating loop
(Secondary Loop). As the speed of the pump
increases, more hot water is sent into the Secondary
Loop resulting into warmer water temperature.
The VSP
Elite
can be used as an outdoor reset
control. The VSP can also be used as a set point
control. In this mode of operation, the VSP will
control the injection pump speed to hold a constant
temperature (determined by the user) in the
Secondary Loop. In addition, it provides an outdoor
temperature based cutoff and system pump control.
Three new features have been added to this control.
A customized reset ratio curve for specialized
buildings , a manual pump speed control to manually
adjust the pump speed based on a well balanced
system, and a minimum pump speed adjustment to
allow for pump operation at all heating levels.
INSTALLATION AND OPERATION INSTRUCTIONS
VSP DIGI-E
lItE
Variable Speed Pump Control
®
Elite Series
Injection Pump Control for Hydronic Heating in
Outdoor Reset or Set Point Applications
WARNING
This Heat-Timer control is strictly an operating control; it should never be used as a primary limit or safety control. All
equipment must have its own certified limit and safety controls required by code. The installer must verify proper operation
and correct any safety problems related to the installation of this Heat-Timer control.
This control must be installed by a licensed electrician.
White
Yellow (System Output)
Injection Pump Output
Boiler
SYS
Pump
DHW
Pump
SET
®
C O R P O R A T I O N
R
SYSTEM =
147F
TARGET =
150F
DECREASE
SYSTEM
INCREASE
2 Line Alphanumeric Display
Displays sensor values and
menu settings
Output Lights indicate
output status
Display Section Locking Screws
Black (120VAC power)
