Friedrich 9 - Manual (Page 19)

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Reversing valve:
Always de-energized when “Cool” switch is selected on thermostat.
Compressor operation:
If ambient indoor temperature is above set point temperature depending on t-stat differential and
the compressor is not time delayed, turn on compressor. If ambient indoor temperature is
below set point depending on t-stat differential, turn off the compressor.
Compressor time delay:
The time delay feature is de-energized for a period of time that varies randomly from 180 to
240 seconds. Compressor time delay is initiated every time the compressor is “off” due to:
(1) Satisfying the temperature set point,
(2) Changing mode to fan only
(3 )Turning the unit off.
(4) Control is first energized or when power is restored after failure
Note: Time delay is disabled during Test Mode.
Indoor coil frost protection (Error Code 07):
While in cool mode: If the indoor coil frost protection sensor reads 30°F for 2 minutes continu-
ously, turn off the compressor, but continue fan operation. While the compressor is out and the
fan is running: when the indoor coil frost protection sensor reaches 45°F, turn on the compres-
sor. However, the compressor must still wait a standard time of 180 to 240 seconds. While 07
flash, heat operation is disabled.
Fan delay:
This is only for fan ‘cycle’ mode and not for fan ‘continuous’ mode. When unit cycles cool-
ing ON – start the fan 5 seconds EARLY. When unit cycles cooling OFF – DELAY the fan off
for 30 seconds. Note: the fan delay is disabled during Test Mode.
Reversing valve: Always de-energized when “Heat” button is pushed.
Compressor operation: Compressor does not operate in this mode.
Electric heat operation: If temp is below set point, depending on t-stat differential, turn on
electric heat. If Ambient is above set point depending on t-stat differential, turn off the electric
heat.
Fan delay: This is only for fan ‘cycle’ mode and not for fan ‘continuous’ mode. When unit
cycles heating ON – start the fan 5 seconds EARLY. When unit cycles heating OFF – DELAY
the fan off for 15 seconds. Note: the fan delay is disabled during Test Mode.
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