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13. Outdoor Unit Operation Control
13.1 System Start Control
13.1.1 Outdoor unit operation mode judgment
• When remote control, centralized control, or Cool/Heat Selector Switch (CZ-RD1) is turned ON, outdoor unit
operation mode is set as shown in table below:
Indoor Unit Operation Condition Outdoor Unit Operation Condition
Cool or Soft Dry Mode Cool Mode
Heat Mode Heat Mode
Fan Mode Off
• The priority of outdoor unit operation mode is given to the indoor unit that turn ON first, when another operation
mode is selected from other indoor unit, the subsequence operation mode will be standby.
• When all indoor units have stopped operation in deice control, outdoor unit continues operation Heat mode, and
operation mode stops after completion of deice control.
13.2 Compressor Startup control
• During cool start condition where the compressor discharge temperature is less than 15°C, compressor
frequency perform a shift up after indoor heat exchanger temperature increase 1°C (15 seconds interval
sampling).
• If not in cool start condition compressor startup will skipped step 2, 3, 4.
Gas bypass valve will ON for a short period once compressor startup
o ON for 60 seconds if compressor discharged temperature is less than 15°C.
o ON for 30 seconds if compressor discharged temperature is 15°C or more.
• Compressor only can be startup after at least 3 minutes of compressor OFF (Compressor restart delay control).
Step 1 Step 2 Step 3 Step 4 Step 5
(Hz)
Time (Sec)
Min 30sec
Max 180sec
Min 30sec
Max 180sec
Min 30sec
Max 180sec
Min 30sec
Max 300sec
Min 30sec
Max 180sec
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