PREMIER E SERIES DUAL CAPACITY INSTALLATION AND MAINTENANCE MANUAL
17
Emergency Heat (W only)
The fan is started on high speed and the first stage of resistance heat is energized 10 seconds
after the “W” input. Continuing demand will engage the additional stages of resistance heat sequen-
tially every 2 minutes.
COOLING OPERATION
In all cooling operations, the reversing valve directly tracks the “O” input, thus any time the “O”
input is present, the reversing valve will be energized.
Cool, 1st Stage (Y1,O)
The fan motor is started on low speed immediately; the first loop pump is energized 5 seconds
after the “Y1” input is received; and the compressor is energized on low capacity 10 seconds after the
“Y1” input. The fan is switched to medium speed 15 seconds after “Y1” input (85% of medium fan
speed if in dehumidification mode) and the hot water pump is cycled 30 seconds after the “Y1” input.
Cool, 2nd Stage (Y1,Y2,O)
The compressor is de-energized immediately, the second loop pump is energized 5 seconds after
the “Y2” input, and the hot water pump is cycled 30 seconds after the “Y2” input. The fan changes to
high speed (85% of high fan speed if in dehumidification mode) 45 seconds after the “Y2” input and
the compressor is energized on high capacity 60 seconds after the “Y2” input.
FAN (G ONLY)
The fan starts on low speed. 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 pumps, hot water pump and accessory outputs are de-energized. Unless the
lockout is caused by an ECM2 low RPM fault, the fan will continue to run on low speed, and if the
thermostat calls for heating 2nd or 3rd stage, emergency heat operation will occur.
Lockout modes of any kind can be reset at the thermostat by turning the mode switch “OFF” for
five seconds then back to desired modes, 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.
Low Pressure
This lockout mode occurs when the normally closed switch is opened for 30 continuous seconds.
Freeze Protection (Water Flow)
This lockout mode occurs when the freeze thermistor temperature is at or below the selected
freeze protection 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 continu-
ous seconds.
Fan RPM
The Premier E control board monitors fan RPM to sense if the fan is not operating. This lockout
mode occurs if the fan RPM falls below the low RPM limit (100 RPM) for 30 continuous seconds.
