Installation manual

32
ENVISION RESIDENTIAL INSTALLATION MANUAL
Freeze Detection (Water Flow)
This lockout mode occurs when the freeze thermistor
temperature is at or below the selected freeze sensing
point (well 30°F or loop 15°F) for 30 continuous seconds.
Condensate Overflow
This lockout mode occurs when the condensate overflow
level has been reached for 30 continuous seconds.
Fan RPM
The control board monitors fan RPM to sense operation.
This lockout mode occurs if the fan RPM falls below the
low RPM limit (100 RPM) for 30 continuous seconds (ECM
only).
IntelliStart
TM
Some models shall be equipped with an optional
IntelliStart. IntelliStart is a single phase soft starter which
reduces the normal start current (LRA) by 60-70%. This
allows the heat pump to more easily go “off grid.” Using
IntelliStart will also provide a substantial reduction in light
flicker, reduce start-up noise, and improve the compressor’s
start behavior. The IntelliStart is self calibrating and may
take several starts to optimize the compressor’s starting
characteristics.
Features
Automatic adjustment of the compressor starting •
current to the available supply voltage —maintaining
constant starting torque and current.
Supply line impedance monitoring and compensation.•
Automatic compensation for residual backpressure in •
the system.
Monitoring of supply voltage while compressor is •
running to prevent motor stalling, causing excessive
currents, under low voltage conditions.
Light flicker reductions of up to 10:1 over LRA under the •
same conditions.
Microprocessor Control cont.