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OPERATIONAL INFORMATION
Timers
Five--Minute Compressor Timeguard
This timer prevents compressor from starting unless it has been off for at least 5
minutes. It can be overridden for 1 cycle by simultaneously pressing FAN and
UP buttons.
Cycle Timer
Based on the selection of 2, 4, or 6 cycles per hour, this timer is set to 30, 15, or
10 minutes. This much time must elapse from the start of one cycle before
another cycle can start. It serves to impose the cycles per hour limits. It can be
defeated for one cycle by simultaneously pressing the FAN and UP buttons.
Ten--Minute Staging Timer
In multistage heating or cooling, this timer prevents any higher stage from
turning on until preceding stage has been on for 10 minutes. When staging
between compressor and electric heat or between compressor a nd furnace heat,
the time is configurable. The timer is configurable via Option 17. This timer is
overridden if temperature error is greater than 5_ (usually due to a large change
in desired temperature) and equipment stages up in 60 second intervals.
Defrost
When defrost occurs in a Hybrid Heat system, the furnace will operate during the
defrost cycle. At the end of the defrost cycle, the furnace and heat pump will be
de--ener gized while the fan is energized for 2 minutes allowing the heat
exchanger to cool down. At the end of the 2 minute time, the heat pump will be
re--energized if a call for heat still exists.
Detection of defrost will not work properly if the installer has configured the
O/W2/B output to function as a B output. During heat pump heating, a defrost