1
A Variable Speed Pump Control
VSP
INSTALLATION/OPERATING INSTRUCTIONS
Table of Contents
Piping
..........................................................................................................................pg. 2
Piping Diagrams
..................................................................................................................pg. 3
Pipe Sizing
..................................................................................................................pg. 4
Control Installation
..............................................................................................................pg. 7
Display Chart
...................................................................................................................pg. 10
Operation
.................................................................................................................pg. 11
Troubleshooting
.................................................................................................................pg. 14
The VSP is a hydronic heating control. 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, and the temperature of the heating water increases.
The VSP can be used as an outdoor reset control. When the outdoor temperature falls below an adjustable start point,
the heating system is activated. The temperature of the Secondary loop water is then automatically regulated based on
outdoor temperature. The outdoor reset function maintains constant and comfortable ambient building temperatures in all
weather conditions.
The VSP can also be used as a set point control. In this mode of operation, the VSP will control the pump speed to hold a
constant temperature (determined by the user) in the Secondary loop. The outdoor start temperature can be set to ON so
the set point will be held regardless of outside temperature.
The VSP is equipped with a Primary loop sensor. This sensor monitors the temperature of the boiler return water. If the
boiler return water falls below an adjustable temperature, the VSP can be configured to slow down the speed of the
injection pump to help the boiler return water temperatures recover.
The VSP can be enabled or disabled from a standard thermostat or switch. Or, the VSP can reduce the temperature of the
heating loop water when the building is not occupied or when occupants are sleeping.
