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NS SPLIT INSTALLATION MANUAL
high speed if in dehumidication mode). The Comfort Alert will
delay the second stage compressor until 5 seconds after it
receives a “Y2” from the board.
Fan (G only)
The fan starts on low speed (PSC ON). Regardless of fan
input “G” from thermostat, the fan will remain on low speed for 30
seconds at the end of each heating, cooling or emergency heat
cycle.
Lockout Conditions
During lockout mode, the appropriate unit and thermostat
lockout LEDs will illuminate. The compressor, loop pump, hot
water pump, and accessory outputs are de-energized. The fan will
continue to run on low speed. If the thermostat calls for heating,
emergency heat operation will occur.
Comfort Alert lockouts cannot be reset at the thermostat.
All other lockout modes can be reset at the thermostat after
turning the unit off, then on, which restores normal operation but
keeps the unit lockout LED illuminated. Interruption of power to
the unit will reset a lockout without a waiting period and clear all
lockout LEDs.
High Pressure
This lockout mode occurs when the normally closed safety
switch is opened momentarily (set at 600 PSI).
Low Pressure
This lockout mode occurs when the normally closed low
pressure switch is opened for 30 continuous seconds (set at 40 PSI).
A low pressure fault may also be indicated when a Comfort Alert
lockout has occurred.
Freeze Sensing (Water Flow)
This lockout mode occurs when the freeze thermistor
temperature is at or below the selected freeze point (well 30°F or
loop 15°F) for 30 continuous seconds.
Microprocessor Control (cont.)