WaterFurnace Envision Hydronic - Manual (Page 22)

22
NSKW INSTALLATION MANUAL
NSKWs come with a factory installed control board that is
capable of receiving commands from the internal controller
provided with the heat pump. An alternative method is
to control the heat pump using an external field supplied
Aquastat or thermostat that will turn the compressor on/off
based on leaving water temperature.
When the heat pump is controlled by the internal controller
it is called “Primary Mode” which allows the user to adjust
the comfort level by adjusting temperature setting on the
heat pump display. For more information refer to panel
configuration on standard controls.
An additional way of controlling the heat pump is by use of
an external control such as an aquastat that gives a signal
to the heat pump controlling to enable the compressor
output. This mode of control is referred to as “Secondary
Mode” and requires components from an external field
supplied source. For more information on this control
strategy refer to external control section of the manual.
Heat Pump Control
IntelliStart ®
The optional IntelliStart single phase soft starter will reduce
the normal start current (LRA) by 60%. Using IntelliStart
also provides a substantial reduction in light flicker, reduces
startup noise, and improves the compressor’s start behavior.