Basic & Protection Functions - Rio RIO09HP115V1A Installation, Service & Troubleshooting

Basic & Protection Functions
Basic Functions
The compressor should stay off for at least 3 minutes before starting the unit. The compressor circuit has a 3 minute delay if
the compressor is de-energized during a run cycle. If the compressor starts from a de-energized cycle, there will be no time
delay. The compressor has a minimum runtime of 6 minutes regardless of room temperature.
1) Cooling Mode
Cooling Process
When the indoor ambient rises 40 F above the preset temperature from a stopped state, the unit will start the cooling cycle.
The outdoor fan and compressor will start. The indoor fan will run continuously at the selected speed. The outdoor unit
will monitor the appropriate temperatures and pressure and adjust the compressor speed and the EEV as required. If the
indoor ambient is > 40 F than the preset temperature, the compressor will increase the frequency; < 40 F the compressor
will begin reducing the frequency. The EEV will be closed on indoor units with no cooling requirement. The G10
technology will control compressor speed based on indoor load and compressor amperage. When the indoor temperature
is satisfied, the compressor will stop, then 30 seconds later the outdoor fan will stop. When the cooling mode transfers to
heating mode, the 4-way valve will be energized after a two minute compressor delay.
Evaporator Freeze Protection
The software will monitor the indoor evaporator coil form freezing.
The following will occur 6 minutes after the compressor has been operating in the cooling or dry mode:
If the evaporator temperature drops below 360 F, the compressor will operate at a reduced frequency. If the evaporator
is below 300 F for 3 minutes, the compressor will stop, 30 seconds later the outdoor fan will stop. In cooling mode, the
indoor fan and swing motor will remain on. If the evaporator temperature is >= 500 F and the compressor is off for at least
3 minutes, the compressor will resume its normal operation state.
Overcurrent Protection
The software will monitor the compressor current to maintain it in a safety and reliable operating range.
If the total current is greater than the rating, the compressor will stop; the outdoor fan will continue to run for 30 seconds,
then stop.
2) Dry Mode
Drying Process
This feature will not take the place of a dehumidifier, it is intended to dry the filter and slightly cool the air. If the indoor
ambient temperature is greater than the preset temperature, the unit will enter the cooling and drying mode, in which
case the compressor will operate and the indoor fan will run at a low speed. When the indoor ambient temperature is at or
below the preset temperature, the unit will operate in it previous running state. When the indoor ambient drops to more
than 40 F below the preset temperature the compressor will stop running, then 30 seconds later the outdoor fan will stop,
the indoor fan will run at low speed.
- 20 F
30 Sec 30 Sec
60 Sec 60 Sec
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