Technical Information
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Outdoor Unit
1. Check the ambient temperature compensation function and the indoor ambient temperature compensation function.
a. Cooling mode – Indoor ambient temperature computing control model = (T indoor ambient temperature -
T cooling
indoor ambient temperature compensation).
b. Heating mode - Indoor ambient temperature computing control model = (T indoor ambient temperature -
T heating
indoor ambient temperature compensation).
2. Check effective judgment controls of parameters.
a. Condition A – Exhaust Detection Temperature Change
• After running the compressor for 10 minutes, check the compressor frequency. If the compressor frequency is f ≥
40Hz and the rising value Texhaust (T exhaust after starting for 10 minutes – T exhaust before start up) ≤35.6ºF,
the outdoor exhaust temperature thermos-bulb can be judged not to be connected into place ( judging once the
power is on the first time).
b. Condition B
• Comparative judgement of exhaust detection temperature and condenser detection temperature (T pipe
temperature = T outdoor pipe temperature in cooling mode, T pipe temperature = T indoor pipe temperature in
heating mode).
• After running the compressor for 10 minutes, check the compressor frequency. If the compressor frequency is f ≥
40Hz and (T pipe temperature ≥ (T e37.4), the outdoor exhaust temperature thermos-bulb can be judged
not be connected into place ( judging once the power is on).
3. Basic Functions
a. Cooling Mode
• Conditions and Processes of Cooling Operation:
• If the compressor is shut down, and [T setup – (T indoor ambient temperature T cooling indoor ambient
temperature compensation)] ≤ 32.9ºF, the cooling operation will start.
• If cooling operation is 32ºF ≤ [T setup – (T indoor ambient temperature -
T cooling indoor ambient temperature
compensation)] < 35.6ºF, the cooling operation will continue to run.
• If cooling operation is 35.6ºF ≤ [T setup – (T indoor ambient temperature -
T cooling indoor ambient temperature
compensation)], the cooling operation will stop after reaching the temperature set point.
b. Temperature Setting Range
• If T outdoor ambient temperature ≥ [T low temperature cooling temperature], the temperature can be set at 61ºF –
86ºF (Cooling at room temperature).
• If T outdoor ambient temperature < [T low temperature cooling temperature], the temperature can be set at 77ºF –
86ºF (cooling temperature), that is the minimum temperature setting for the outdoor set to 77ºF.
4. Dehumidifying Mode
a. Temperature setting range is 61.0ºF - 86.0ºF.
b. Conditions of dehumidifying process: see cooling operations above.
5. Air Supplying Mode
a. Temperature setting range is 61.0ºF - 86.0ºF.
b. Compressor, outdoor fans and four-way valves are switched to off.
6. Heating Mode
a. Conditions and Processes of Heating Operation:
• (T ambient temperature is the actual detection temperature of indoor environment thermos-bulb. Indoor ambient
temperature compensation during heating operations).
• If the compressor is shut down, and [(T indoor ambient temperature - T heating indoor ambient temperature
compensation) – T setup] ≤ 32.9ºF, start the unit to enter heating operations.
• If heating operation is 32ºF ≤ [(T indoor ambient temperature -
T heating indoor ambient temperature
compensation) – T setup] < 35.6ºF, the heating operation will continue to run.
• If heating operation is 35.6ºF ≤ [(T indoor ambient temperature -
T heating indoor temperature compensation) –
T setup], the heating operation will stop after reaching the temperature set point.
b. Temperature setting range is 61.0ºF - 86.0ºF
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